/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/types.h>
#include <linux/atomic.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/printk.h>
#include <linux/pci_ids.h>
#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/card.h>
#include <linux/semaphore.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/bcma/bcma.h>
#include <linux/debugfs.h>
#include <linux/vmalloc.h>
#include <asm/unaligned.h>
#include <defs.h>
#include <brcmu_wifi.h>
#include <brcmu_utils.h>
#include <brcm_hw_ids.h>
#include <soc.h>
#include "sdio.h"
#include "chip.h"
#include "firmware.h"
#include "core.h"
#include "common.h"

#define DCMD_RESP_TIMEOUT       msecs_to_jiffies(2500)
#define CTL_DONE_TIMEOUT        msecs_to_jiffies(2500)

#ifdef DEBUG

#define BRCMF_TRAP_INFO_SIZE    80

#define CBUF_LEN        (128)

/* Device console log buffer state */
#define CONSOLE_BUFFER_MAX      2024

struct rte_log_le {
        __le32 buf;             /* Can't be pointer on (64-bit) hosts */
        __le32 buf_size;
        __le32 idx;
        char *_buf_compat;      /* Redundant pointer for backward compat. */
};

struct rte_console {
        /* Virtual UART
         * When there is no UART (e.g. Quickturn),
         * the host should write a complete
         * input line directly into cbuf and then write
         * the length into vcons_in.
         * This may also be used when there is a real UART
         * (at risk of conflicting with
         * the real UART).  vcons_out is currently unused.
         */
        uint vcons_in;
        uint vcons_out;

        /* Output (logging) buffer
         * Console output is written to a ring buffer log_buf at index log_idx.
         * The host may read the output when it sees log_idx advance.
         * Output will be lost if the output wraps around faster than the host
         * polls.
         */
        struct rte_log_le log_le;

        /* Console input line buffer
         * Characters are read one at a time into cbuf
         * until <CR> is received, then
         * the buffer is processed as a command line.
         * Also used for virtual UART.
         */
        uint cbuf_idx;
        char cbuf[CBUF_LEN];
};

#endif                          /* DEBUG */
#include <chipcommon.h>

#include "bus.h"
#include "debug.h"
#include "tracepoint.h"

#define TXQLEN          2048    /* bulk tx queue length */
#define TXHI            (TXQLEN - 256)  /* turn on flow control above TXHI */
#define TXLOW           (TXHI - 256)    /* turn off flow control below TXLOW */
#define PRIOMASK        7

#define TXRETRIES       2       /* # of retries for tx frames */

#define BRCMF_RXBOUND   50      /* Default for max rx frames in
                                 one scheduling */

#define BRCMF_TXBOUND   20      /* Default for max tx frames in
                                 one scheduling */

#define BRCMF_TXMINMAX  1       /* Max tx frames if rx still pending */

#define MEMBLOCK        2048    /* Block size used for downloading
                                 of dongle image */
#define MAX_DATA_BUF    (32 * 1024)     /* Must be large enough to hold
                                 biggest possible glom */

#define BRCMF_FIRSTREAD (1 << 6)

#define BRCMF_CONSOLE   10      /* watchdog interval to poll console */

/* SBSDIO_DEVICE_CTL */

/* 1: device will assert busy signal when receiving CMD53 */
#define SBSDIO_DEVCTL_SETBUSY           0x01
/* 1: assertion of sdio interrupt is synchronous to the sdio clock */
#define SBSDIO_DEVCTL_SPI_INTR_SYNC     0x02
/* 1: mask all interrupts to host except the chipActive (rev 8) */
#define SBSDIO_DEVCTL_CA_INT_ONLY       0x04
/* 1: isolate internal sdio signals, put external pads in tri-state; requires
 * sdio bus power cycle to clear (rev 9) */
#define SBSDIO_DEVCTL_PADS_ISO          0x08
/* Force SD->SB reset mapping (rev 11) */
#define SBSDIO_DEVCTL_SB_RST_CTL        0x30
/*   Determined by CoreControl bit */
#define SBSDIO_DEVCTL_RST_CORECTL       0x00
/*   Force backplane reset */
#define SBSDIO_DEVCTL_RST_BPRESET       0x10
/*   Force no backplane reset */
#define SBSDIO_DEVCTL_RST_NOBPRESET     0x20

/* direct(mapped) cis space */

/* MAPPED common CIS address */
#define SBSDIO_CIS_BASE_COMMON          0x1000
/* maximum bytes in one CIS */
#define SBSDIO_CIS_SIZE_LIMIT           0x200
/* cis offset addr is < 17 bits */
#define SBSDIO_CIS_OFT_ADDR_MASK        0x1FFFF

/* manfid tuple length, include tuple, link bytes */
#define SBSDIO_CIS_MANFID_TUPLE_LEN     6

#define CORE_BUS_REG(base, field) \
                (base + offsetof(struct sdpcmd_regs, field))

/* SDIO function 1 register CHIPCLKCSR */
/* Force ALP request to backplane */
#define SBSDIO_FORCE_ALP                0x01
/* Force HT request to backplane */
#define SBSDIO_FORCE_HT                 0x02
/* Force ILP request to backplane */
#define SBSDIO_FORCE_ILP                0x04
/* Make ALP ready (power up xtal) */
#define SBSDIO_ALP_AVAIL_REQ            0x08
/* Make HT ready (power up PLL) */
#define SBSDIO_HT_AVAIL_REQ             0x10
/* Squelch clock requests from HW */
#define SBSDIO_FORCE_HW_CLKREQ_OFF      0x20
/* Status: ALP is ready */
#define SBSDIO_ALP_AVAIL                0x40
/* Status: HT is ready */
#define SBSDIO_HT_AVAIL                 0x80
#define SBSDIO_CSR_MASK                 0x1F
#define SBSDIO_AVBITS           (SBSDIO_HT_AVAIL | SBSDIO_ALP_AVAIL)
#define SBSDIO_ALPAV(regval)    ((regval) & SBSDIO_AVBITS)
#define SBSDIO_HTAV(regval)     (((regval) & SBSDIO_AVBITS) == SBSDIO_AVBITS)
#define SBSDIO_ALPONLY(regval)  (SBSDIO_ALPAV(regval) && !SBSDIO_HTAV(regval))
#define SBSDIO_CLKAV(regval, alponly) \
        (SBSDIO_ALPAV(regval) && (alponly ? 1 : SBSDIO_HTAV(regval)))

/* intstatus */
#define I_SMB_SW0       (1 << 0)        /* To SB Mail S/W interrupt 0 */
#define I_SMB_SW1       (1 << 1)        /* To SB Mail S/W interrupt 1 */
#define I_SMB_SW2       (1 << 2)        /* To SB Mail S/W interrupt 2 */
#define I_SMB_SW3       (1 << 3)        /* To SB Mail S/W interrupt 3 */
#define I_SMB_SW_MASK   0x0000000f      /* To SB Mail S/W interrupts mask */
#define I_SMB_SW_SHIFT  0       /* To SB Mail S/W interrupts shift */
#define I_HMB_SW0       (1 << 4)        /* To Host Mail S/W interrupt 0 */
#define I_HMB_SW1       (1 << 5)        /* To Host Mail S/W interrupt 1 */
#define I_HMB_SW2       (1 << 6)        /* To Host Mail S/W interrupt 2 */
#define I_HMB_SW3       (1 << 7)        /* To Host Mail S/W interrupt 3 */
#define I_HMB_SW_MASK   0x000000f0      /* To Host Mail S/W interrupts mask */
#define I_HMB_SW_SHIFT  4       /* To Host Mail S/W interrupts shift */
#define I_WR_OOSYNC     (1 << 8)        /* Write Frame Out Of Sync */
#define I_RD_OOSYNC     (1 << 9)        /* Read Frame Out Of Sync */
#define I_PC            (1 << 10)       /* descriptor error */
#define I_PD            (1 << 11)       /* data error */
#define I_DE            (1 << 12)       /* Descriptor protocol Error */
#define I_RU            (1 << 13)       /* Receive descriptor Underflow */
#define I_RO            (1 << 14)       /* Receive fifo Overflow */
#define I_XU            (1 << 15)       /* Transmit fifo Underflow */
#define I_RI            (1 << 16)       /* Receive Interrupt */
#define I_BUSPWR        (1 << 17)       /* SDIO Bus Power Change (rev 9) */
#define I_XMTDATA_AVAIL (1 << 23)       /* bits in fifo */
#define I_XI            (1 << 24)       /* Transmit Interrupt */
#define I_RF_TERM       (1 << 25)       /* Read Frame Terminate */
#define I_WF_TERM       (1 << 26)       /* Write Frame Terminate */
#define I_PCMCIA_XU     (1 << 27)       /* PCMCIA Transmit FIFO Underflow */
#define I_SBINT         (1 << 28)       /* sbintstatus Interrupt */
#define I_CHIPACTIVE    (1 << 29)       /* chip from doze to active state */
#define I_SRESET        (1 << 30)       /* CCCR RES interrupt */
#define I_IOE2          (1U << 31)      /* CCCR IOE2 Bit Changed */
#define I_ERRORS        (I_PC | I_PD | I_DE | I_RU | I_RO | I_XU)
#define I_DMA           (I_RI | I_XI | I_ERRORS)

/* corecontrol */
#define CC_CISRDY               (1 << 0)        /* CIS Ready */
#define CC_BPRESEN              (1 << 1)        /* CCCR RES signal */
#define CC_F2RDY                (1 << 2)        /* set CCCR IOR2 bit */
#define CC_CLRPADSISO           (1 << 3)        /* clear SDIO pads isolation */
#define CC_XMTDATAAVAIL_MODE    (1 << 4)
#define CC_XMTDATAAVAIL_CTRL    (1 << 5)

/* SDA_FRAMECTRL */
#define SFC_RF_TERM     (1 << 0)        /* Read Frame Terminate */
#define SFC_WF_TERM     (1 << 1)        /* Write Frame Terminate */
#define SFC_CRC4WOOS    (1 << 2)        /* CRC error for write out of sync */
#define SFC_ABORTALL    (1 << 3)        /* Abort all in-progress frames */

/*
 * Software allocation of To SB Mailbox resources
 */

/* tosbmailbox bits corresponding to intstatus bits */
#define SMB_NAK         (1 << 0)        /* Frame NAK */
#define SMB_INT_ACK     (1 << 1)        /* Host Interrupt ACK */
#define SMB_USE_OOB     (1 << 2)        /* Use OOB Wakeup */
#define SMB_DEV_INT     (1 << 3)        /* Miscellaneous Interrupt */

/* tosbmailboxdata */
#define SMB_DATA_VERSION_SHIFT  16      /* host protocol version */

/*
 * Software allocation of To Host Mailbox resources
 */

/* intstatus bits */
#define I_HMB_FC_STATE  I_HMB_SW0       /* Flow Control State */
#define I_HMB_FC_CHANGE I_HMB_SW1       /* Flow Control State Changed */
#define I_HMB_FRAME_IND I_HMB_SW2       /* Frame Indication */
#define I_HMB_HOST_INT  I_HMB_SW3       /* Miscellaneous Interrupt */

/* tohostmailboxdata */
#define HMB_DATA_NAKHANDLED     1       /* retransmit NAK'd frame */
#define HMB_DATA_DEVREADY       2       /* talk to host after enable */
#define HMB_DATA_FC             4       /* per prio flowcontrol update flag */
#define HMB_DATA_FWREADY        8       /* fw ready for protocol activity */

#define HMB_DATA_FCDATA_MASK    0xff000000
#define HMB_DATA_FCDATA_SHIFT   24

#define HMB_DATA_VERSION_MASK   0x00ff0000
#define HMB_DATA_VERSION_SHIFT  16

/*
 * Software-defined protocol header
 */

/* Current protocol version */
#define SDPCM_PROT_VERSION      4

/*
 * Shared structure between dongle and the host.
 * The structure contains pointers to trap or assert information.
 */
#define SDPCM_SHARED_VERSION       0x0003
#define SDPCM_SHARED_VERSION_MASK  0x00FF
#define SDPCM_SHARED_ASSERT_BUILT  0x0100
#define SDPCM_SHARED_ASSERT        0x0200
#define SDPCM_SHARED_TRAP          0x0400

/* Space for header read, limit for data packets */
#define MAX_HDR_READ    (1 << 6)
#define MAX_RX_DATASZ   2048

/* Bump up limit on waiting for HT to account for first startup;
 * if the image is doing a CRC calculation before programming the PMU
 * for HT availability, it could take a couple hundred ms more, so
 * max out at a 1 second (1000000us).
 */
#undef PMU_MAX_TRANSITION_DLY
#define PMU_MAX_TRANSITION_DLY 1000000

/* Value for ChipClockCSR during initial setup */
#define BRCMF_INIT_CLKCTL1      (SBSDIO_FORCE_HW_CLKREQ_OFF |   \
                                        SBSDIO_ALP_AVAIL_REQ)

/* Flags for SDH calls */
#define F2SYNC  (SDIO_REQ_4BYTE | SDIO_REQ_FIXED)

#define BRCMF_IDLE_ACTIVE       0       /* Do not request any SD clock change
                                         * when idle
                                         */
#define BRCMF_IDLE_INTERVAL     1

#define KSO_WAIT_US 50
#define MAX_KSO_ATTEMPTS (PMU_MAX_TRANSITION_DLY/KSO_WAIT_US)
#define BRCMF_SDIO_MAX_ACCESS_ERRORS    5

/*
 * Conversion of 802.1D priority to precedence level
 */
static uint prio2prec(u32 prio)
{
        return (prio == PRIO_8021D_NONE || prio == PRIO_8021D_BE) ?
               (prio^2) : prio;
}

#ifdef DEBUG
/* Device console log buffer state */
struct brcmf_console {
        uint count;             /* Poll interval msec counter */
        uint log_addr;          /* Log struct address (fixed) */
        struct rte_log_le log_le;       /* Log struct (host copy) */
        uint bufsize;           /* Size of log buffer */
        u8 *buf;                /* Log buffer (host copy) */
        uint last;              /* Last buffer read index */
};

struct brcmf_trap_info {
        __le32          type;
        __le32          epc;
        __le32          cpsr;
        __le32          spsr;
        __le32          r0;     /* a1 */
        __le32          r1;     /* a2 */
        __le32          r2;     /* a3 */
        __le32          r3;     /* a4 */
        __le32          r4;     /* v1 */
        __le32          r5;     /* v2 */
        __le32          r6;     /* v3 */
        __le32          r7;     /* v4 */
        __le32          r8;     /* v5 */
        __le32          r9;     /* sb/v6 */
        __le32          r10;    /* sl/v7 */
        __le32          r11;    /* fp/v8 */
        __le32          r12;    /* ip */
        __le32          r13;    /* sp */
        __le32          r14;    /* lr */
        __le32          pc;     /* r15 */
};
#endif                          /* DEBUG */

struct sdpcm_shared {
        u32 flags;
        u32 trap_addr;
        u32 assert_exp_addr;
        u32 assert_file_addr;
        u32 assert_line;
        u32 console_addr;       /* Address of struct rte_console */
        u32 msgtrace_addr;
        u8 tag[32];
        u32 brpt_addr;
};

struct sdpcm_shared_le {
        __le32 flags;
        __le32 trap_addr;
        __le32 assert_exp_addr;
        __le32 assert_file_addr;
        __le32 assert_line;
        __le32 console_addr;    /* Address of struct rte_console */
        __le32 msgtrace_addr;
        u8 tag[32];
        __le32 brpt_addr;
};

/* dongle SDIO bus specific header info */
struct brcmf_sdio_hdrinfo {
        u8 seq_num;
        u8 channel;
        u16 len;
        u16 len_left;
        u16 len_nxtfrm;
        u8 dat_offset;
        bool lastfrm;
        u16 tail_pad;
};

/*
 * hold counter variables
 */
struct brcmf_sdio_count {
        uint intrcount;         /* Count of device interrupt callbacks */
        uint lastintrs;         /* Count as of last watchdog timer */
        uint pollcnt;           /* Count of active polls */
        uint regfails;          /* Count of R_REG failures */
        uint tx_sderrs;         /* Count of tx attempts with sd errors */
        uint fcqueued;          /* Tx packets that got queued */
        uint rxrtx;             /* Count of rtx requests (NAK to dongle) */
        uint rx_toolong;        /* Receive frames too long to receive */
        uint rxc_errors;        /* SDIO errors when reading control frames */
        uint rx_hdrfail;        /* SDIO errors on header reads */
        uint rx_badhdr;         /* Bad received headers (roosync?) */
        uint rx_badseq;         /* Mismatched rx sequence number */
        uint fc_rcvd;           /* Number of flow-control events received */
        uint fc_xoff;           /* Number which turned on flow-control */
        uint fc_xon;            /* Number which turned off flow-control */
        uint rxglomfail;        /* Failed deglom attempts */
        uint rxglomframes;      /* Number of glom frames (superframes) */
        uint rxglompkts;        /* Number of packets from glom frames */
        uint f2rxhdrs;          /* Number of header reads */
        uint f2rxdata;          /* Number of frame data reads */
        uint f2txdata;          /* Number of f2 frame writes */
        uint f1regdata;         /* Number of f1 register accesses */
        uint tickcnt;           /* Number of watchdog been schedule */
        ulong tx_ctlerrs;       /* Err of sending ctrl frames */
        ulong tx_ctlpkts;       /* Ctrl frames sent to dongle */
        ulong rx_ctlerrs;       /* Err of processing rx ctrl frames */
        ulong rx_ctlpkts;       /* Ctrl frames processed from dongle */
        ulong rx_readahead_cnt; /* packets where header read-ahead was used */
};

/* misc chip info needed by some of the routines */
/* Private data for SDIO bus interaction */
struct brcmf_sdio {
        struct brcmf_sdio_dev *sdiodev; /* sdio device handler */
        struct brcmf_chip *ci;  /* Chip info struct */

        u32 hostintmask;        /* Copy of Host Interrupt Mask */
        atomic_t intstatus;     /* Intstatus bits (events) pending */
        atomic_t fcstate;       /* State of dongle flow-control */

        uint blocksize;         /* Block size of SDIO transfers */
        uint roundup;           /* Max roundup limit */

        struct pktq txq;        /* Queue length used for flow-control */
        u8 flowcontrol; /* per prio flow control bitmask */
        u8 tx_seq;              /* Transmit sequence number (next) */
        u8 tx_max;              /* Maximum transmit sequence allowed */

        u8 *hdrbuf;             /* buffer for handling rx frame */
        u8 *rxhdr;              /* Header of current rx frame (in hdrbuf) */
        u8 rx_seq;              /* Receive sequence number (expected) */
        struct brcmf_sdio_hdrinfo cur_read;
                                /* info of current read frame */
        bool rxskip;            /* Skip receive (awaiting NAK ACK) */
        bool rxpending;         /* Data frame pending in dongle */

        uint rxbound;           /* Rx frames to read before resched */
        uint txbound;           /* Tx frames to send before resched */
        uint txminmax;

        struct sk_buff *glomd;  /* Packet containing glomming descriptor */
        struct sk_buff_head glom; /* Packet list for glommed superframe */

        u8 *rxbuf;              /* Buffer for receiving control packets */
        uint rxblen;            /* Allocated length of rxbuf */
        u8 *rxctl;              /* Aligned pointer into rxbuf */
        u8 *rxctl_orig;         /* pointer for freeing rxctl */
        uint rxlen;             /* Length of valid data in buffer */
        spinlock_t rxctl_lock;  /* protection lock for ctrl frame resources */

        u8 sdpcm_ver;   /* Bus protocol reported by dongle */

        bool intr;              /* Use interrupts */
        bool poll;              /* Use polling */
        atomic_t ipend;         /* Device interrupt is pending */
        uint spurious;          /* Count of spurious interrupts */
        uint pollrate;          /* Ticks between device polls */
        uint polltick;          /* Tick counter */

#ifdef DEBUG
        uint console_interval;
        struct brcmf_console console;   /* Console output polling support */
        uint console_addr;      /* Console address from shared struct */
#endif                          /* DEBUG */

        uint clkstate;          /* State of sd and backplane clock(s) */
        s32 idletime;           /* Control for activity timeout */
        s32 idlecount;          /* Activity timeout counter */
        s32 idleclock;          /* How to set bus driver when idle */
        bool rxflow_mode;       /* Rx flow control mode */
        bool rxflow;            /* Is rx flow control on */
        bool alp_only;          /* Don't use HT clock (ALP only) */

        u8 *ctrl_frame_buf;
        u16 ctrl_frame_len;
        bool ctrl_frame_stat;
        int ctrl_frame_err;

        spinlock_t txq_lock;            /* protect bus->txq */
        wait_queue_head_t ctrl_wait;
        wait_queue_head_t dcmd_resp_wait;

        struct timer_list timer;
        struct completion watchdog_wait;
        struct task_struct *watchdog_tsk;
        bool wd_active;

        struct workqueue_struct *brcmf_wq;
        struct work_struct datawork;
        bool dpc_triggered;
        bool dpc_running;

        bool txoff;             /* Transmit flow-controlled */
        struct brcmf_sdio_count sdcnt;
        bool sr_enabled; /* SaveRestore enabled */
        bool sleeping;

        u8 tx_hdrlen;           /* sdio bus header length for tx packet */
        bool txglom;            /* host tx glomming enable flag */
        u16 head_align;         /* buffer pointer alignment */
        u16 sgentry_align;      /* scatter-gather buffer alignment */
};

/* clkstate */
#define CLK_NONE        0
#define CLK_SDONLY      1
#define CLK_PENDING     2
#define CLK_AVAIL       3

#ifdef DEBUG
static int qcount[NUMPRIO];
#endif                          /* DEBUG */

#define DEFAULT_SDIO_DRIVE_STRENGTH     6       /* in milliamps */

#define RETRYCHAN(chan) ((chan) == SDPCM_EVENT_CHANNEL)

/* Limit on rounding up frames */
static const uint max_roundup = 512;

#define ALIGNMENT  4

enum brcmf_sdio_frmtype {
        BRCMF_SDIO_FT_NORMAL,
        BRCMF_SDIO_FT_SUPER,
        BRCMF_SDIO_FT_SUB,
};

#define SDIOD_DRVSTR_KEY(chip, pmu)     (((chip) << 16) | (pmu))

/* SDIO Pad drive strength to select value mappings */
struct sdiod_drive_str {
        u8 strength;    /* Pad Drive Strength in mA */
        u8 sel;         /* Chip-specific select value */
};

/* SDIO Drive Strength to sel value table for PMU Rev 11 (1.8V) */
static const struct sdiod_drive_str sdiod_drvstr_tab1_1v8[] = {
        {32, 0x6},
        {26, 0x7},
        {22, 0x4},
        {16, 0x5},
        {12, 0x2},
        {8, 0x3},
        {4, 0x0},
        {0, 0x1}
};

/* SDIO Drive Strength to sel value table for PMU Rev 13 (1.8v) */
static const struct sdiod_drive_str sdiod_drive_strength_tab5_1v8[] = {
        {6, 0x7},
        {5, 0x6},
        {4, 0x5},
        {3, 0x4},
        {2, 0x2},
        {1, 0x1},
        {0, 0x0}
};

/* SDIO Drive Strength to sel value table for PMU Rev 17 (1.8v) */
static const struct sdiod_drive_str sdiod_drvstr_tab6_1v8[] = {
        {3, 0x3},
        {2, 0x2},
        {1, 0x1},
        {0, 0x0} };

/* SDIO Drive Strength to sel value table for 43143 PMU Rev 17 (3.3V) */
static const struct sdiod_drive_str sdiod_drvstr_tab2_3v3[] = {
        {16, 0x7},
        {12, 0x5},
        {8,  0x3},
        {4,  0x1}
};

BRCMF_FW_NVRAM_DEF(43143, "brcmfmac43143-sdio.bin", "brcmfmac43143-sdio.txt");
BRCMF_FW_NVRAM_DEF(43241B0, "brcmfmac43241b0-sdio.bin",
                   "brcmfmac43241b0-sdio.txt");
BRCMF_FW_NVRAM_DEF(43241B4, "brcmfmac43241b4-sdio.bin",
                   "brcmfmac43241b4-sdio.txt");
BRCMF_FW_NVRAM_DEF(43241B5, "brcmfmac43241b5-sdio.bin",
                   "brcmfmac43241b5-sdio.txt");
BRCMF_FW_NVRAM_DEF(4329, "brcmfmac4329-sdio.bin", "brcmfmac4329-sdio.txt");
BRCMF_FW_NVRAM_DEF(4330, "brcmfmac4330-sdio.bin", "brcmfmac4330-sdio.txt");
BRCMF_FW_NVRAM_DEF(4334, "brcmfmac4334-sdio.bin", "brcmfmac4334-sdio.txt");
BRCMF_FW_NVRAM_DEF(43340, "brcmfmac43340-sdio.bin", "brcmfmac43340-sdio.txt");
BRCMF_FW_NVRAM_DEF(4335, "brcmfmac4335-sdio.bin", "brcmfmac4335-sdio.txt");
BRCMF_FW_NVRAM_DEF(43362, "brcmfmac43362-sdio.bin", "brcmfmac43362-sdio.txt");
BRCMF_FW_NVRAM_DEF(4339, "brcmfmac4339-sdio.bin", "brcmfmac4339-sdio.txt");
BRCMF_FW_NVRAM_DEF(43430, "brcmfmac43430-sdio.bin", "brcmfmac43430-sdio.txt");
BRCMF_FW_NVRAM_DEF(43455, "brcmfmac43455-sdio.bin", "brcmfmac43455-sdio.txt");
BRCMF_FW_NVRAM_DEF(4354, "brcmfmac4354-sdio.bin", "brcmfmac4354-sdio.txt");
BRCMF_FW_NVRAM_DEF(4356, "brcmfmac4356-sdio.bin", "brcmfmac4356-sdio.txt");

static struct brcmf_firmware_mapping brcmf_sdio_fwnames[] = {
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_43143_CHIP_ID, 0xFFFFFFFF, 43143),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_43241_CHIP_ID, 0x0000001F, 43241B0),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_43241_CHIP_ID, 0x00000020, 43241B4),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_43241_CHIP_ID, 0xFFFFFFC0, 43241B5),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_4329_CHIP_ID, 0xFFFFFFFF, 4329),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_4330_CHIP_ID, 0xFFFFFFFF, 4330),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_4334_CHIP_ID, 0xFFFFFFFF, 4334),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_43340_CHIP_ID, 0xFFFFFFFF, 43340),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_4335_CHIP_ID, 0xFFFFFFFF, 4335),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_43362_CHIP_ID, 0xFFFFFFFE, 43362),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_4339_CHIP_ID, 0xFFFFFFFF, 4339),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_43430_CHIP_ID, 0xFFFFFFFF, 43430),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_4345_CHIP_ID, 0xFFFFFFC0, 43455),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_4354_CHIP_ID, 0xFFFFFFFF, 4354),
        BRCMF_FW_NVRAM_ENTRY(BRCM_CC_4356_CHIP_ID, 0xFFFFFFFF, 4356)
};

static void pkt_align(struct sk_buff *p, int len, int align)
{
        uint datalign;
        datalign = (unsigned long)(p->data);
        datalign = roundup(datalign, (align)) - datalign;
        if (datalign)
                skb_pull(p, datalign);
        __skb_trim(p, len);
}

/* To check if there's window offered */
static bool data_ok(struct brcmf_sdio *bus)
{
        return (u8)(bus->tx_max - bus->tx_seq) != 0 &&
               ((u8)(bus->tx_max - bus->tx_seq) & 0x80) == 0;
}

/*
 * Reads a register in the SDIO hardware block. This block occupies a series of
 * adresses on the 32 bit backplane bus.
 */
static int r_sdreg32(struct brcmf_sdio *bus, u32 *regvar, u32 offset)
{
        struct brcmf_core *core;
        int ret;

        core = brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV);
        *regvar = brcmf_sdiod_regrl(bus->sdiodev, core->base + offset, &ret);

        return ret;
}

static int w_sdreg32(struct brcmf_sdio *bus, u32 regval, u32 reg_offset)
{
        struct brcmf_core *core;
        int ret;

        core = brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV);
        brcmf_sdiod_regwl(bus->sdiodev, core->base + reg_offset, regval, &ret);

        return ret;
}

static int
brcmf_sdio_kso_control(struct brcmf_sdio *bus, bool on)
{
        u8 wr_val = 0, rd_val, cmp_val, bmask;
        int err = 0;
        int err_cnt = 0;
        int try_cnt = 0;

        brcmf_dbg(TRACE, "Enter: on=%d\n", on);

        wr_val = (on << SBSDIO_FUNC1_SLEEPCSR_KSO_SHIFT);
        /* 1st KSO write goes to AOS wake up core if device is asleep  */
        brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR,
                          wr_val, &err);

        if (on) {
                /* device WAKEUP through KSO:
                 * write bit 0 & read back until
                 * both bits 0 (kso bit) & 1 (dev on status) are set
                 */
                cmp_val = SBSDIO_FUNC1_SLEEPCSR_KSO_MASK |
                          SBSDIO_FUNC1_SLEEPCSR_DEVON_MASK;
                bmask = cmp_val;
                usleep_range(2000, 3000);
        } else {
                /* Put device to sleep, turn off KSO */
                cmp_val = 0;
                /* only check for bit0, bit1(dev on status) may not
                 * get cleared right away
                 */
                bmask = SBSDIO_FUNC1_SLEEPCSR_KSO_MASK;
        }

        do {
                /* reliable KSO bit set/clr:
                 * the sdiod sleep write access is synced to PMU 32khz clk
                 * just one write attempt may fail,
                 * read it back until it matches written value
                 */
                rd_val = brcmf_sdiod_regrb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR,
                                           &err);
                if (!err) {
                        if ((rd_val & bmask) == cmp_val)
                                break;
                        err_cnt = 0;
                }
                /* bail out upon subsequent access errors */
                if (err && (err_cnt++ > BRCMF_SDIO_MAX_ACCESS_ERRORS))
                        break;
                udelay(KSO_WAIT_US);
                brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR,
                                  wr_val, &err);
        } while (try_cnt++ < MAX_KSO_ATTEMPTS);

        if (try_cnt > 2)
                brcmf_dbg(SDIO, "try_cnt=%d rd_val=0x%x err=%d\n", try_cnt,
                          rd_val, err);

        if (try_cnt > MAX_KSO_ATTEMPTS)
                brcmf_err("max tries: rd_val=0x%x err=%d\n", rd_val, err);

        return err;
}

#define HOSTINTMASK             (I_HMB_SW_MASK | I_CHIPACTIVE)

/* Turn backplane clock on or off */
static int brcmf_sdio_htclk(struct brcmf_sdio *bus, bool on, bool pendok)
{
        int err;
        u8 clkctl, clkreq, devctl;
        unsigned long timeout;

        brcmf_dbg(SDIO, "Enter\n");

        clkctl = 0;

        if (bus->sr_enabled) {
                bus->clkstate = (on ? CLK_AVAIL : CLK_SDONLY);
                return 0;
        }

        if (on) {
                /* Request HT Avail */
                clkreq =
                    bus->alp_only ? SBSDIO_ALP_AVAIL_REQ : SBSDIO_HT_AVAIL_REQ;

                brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
                                  clkreq, &err);
                if (err) {
                        brcmf_err("HT Avail request error: %d\n", err);
                        return -EBADE;
                }

                /* Check current status */
                clkctl = brcmf_sdiod_regrb(bus->sdiodev,
                                           SBSDIO_FUNC1_CHIPCLKCSR, &err);
                if (err) {
                        brcmf_err("HT Avail read error: %d\n", err);
                        return -EBADE;
                }

                /* Go to pending and await interrupt if appropriate */
                if (!SBSDIO_CLKAV(clkctl, bus->alp_only) && pendok) {
                        /* Allow only clock-available interrupt */
                        devctl = brcmf_sdiod_regrb(bus->sdiodev,
                                                   SBSDIO_DEVICE_CTL, &err);
                        if (err) {
                                brcmf_err("Devctl error setting CA: %d\n",
                                          err);
                                return -EBADE;
                        }

                        devctl |= SBSDIO_DEVCTL_CA_INT_ONLY;
                        brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
                                          devctl, &err);
                        brcmf_dbg(SDIO, "CLKCTL: set PENDING\n");
                        bus->clkstate = CLK_PENDING;

                        return 0;
                } else if (bus->clkstate == CLK_PENDING) {
                        /* Cancel CA-only interrupt filter */
                        devctl = brcmf_sdiod_regrb(bus->sdiodev,
                                                   SBSDIO_DEVICE_CTL, &err);
                        devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
                        brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
                                          devctl, &err);
                }

                /* Otherwise, wait here (polling) for HT Avail */
                timeout = jiffies +
                          msecs_to_jiffies(PMU_MAX_TRANSITION_DLY/1000);
                while (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
                        clkctl = brcmf_sdiod_regrb(bus->sdiodev,
                                                   SBSDIO_FUNC1_CHIPCLKCSR,
                                                   &err);
                        if (time_after(jiffies, timeout))
                                break;
                        else
                                usleep_range(5000, 10000);
                }
                if (err) {
                        brcmf_err("HT Avail request error: %d\n", err);
                        return -EBADE;
                }
                if (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
                        brcmf_err("HT Avail timeout (%d): clkctl 0x%02x\n",
                                  PMU_MAX_TRANSITION_DLY, clkctl);
                        return -EBADE;
                }

                /* Mark clock available */
                bus->clkstate = CLK_AVAIL;
                brcmf_dbg(SDIO, "CLKCTL: turned ON\n");

#if defined(DEBUG)
                if (!bus->alp_only) {
                        if (SBSDIO_ALPONLY(clkctl))
                                brcmf_err("HT Clock should be on\n");
                }
#endif                          /* defined (DEBUG) */

        } else {
                clkreq = 0;

                if (bus->clkstate == CLK_PENDING) {
                        /* Cancel CA-only interrupt filter */
                        devctl = brcmf_sdiod_regrb(bus->sdiodev,
                                                   SBSDIO_DEVICE_CTL, &err);
                        devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
                        brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
                                          devctl, &err);
                }

                bus->clkstate = CLK_SDONLY;
                brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
                                  clkreq, &err);
                brcmf_dbg(SDIO, "CLKCTL: turned OFF\n");
                if (err) {
                        brcmf_err("Failed access turning clock off: %d\n",
                                  err);
                        return -EBADE;
                }
        }
        return 0;
}

/* Change idle/active SD state */
static int brcmf_sdio_sdclk(struct brcmf_sdio *bus, bool on)
{
        brcmf_dbg(SDIO, "Enter\n");

        if (on)
                bus->clkstate = CLK_SDONLY;
        else
                bus->clkstate = CLK_NONE;

        return 0;
}

/* Transition SD and backplane clock readiness */
static int brcmf_sdio_clkctl(struct brcmf_sdio *bus, uint target, bool pendok)
{
#ifdef DEBUG
        uint oldstate = bus->clkstate;
#endif                          /* DEBUG */

        brcmf_dbg(SDIO, "Enter\n");

        /* Early exit if we're already there */
        if (bus->clkstate == target)
                return 0;

        switch (target) {
        case CLK_AVAIL:
                /* Make sure SD clock is available */
                if (bus->clkstate == CLK_NONE)
                        brcmf_sdio_sdclk(bus, true);
                /* Now request HT Avail on the backplane */
                brcmf_sdio_htclk(bus, true, pendok);
                break;

        case CLK_SDONLY:
                /* Remove HT request, or bring up SD clock */
                if (bus->clkstate == CLK_NONE)
                        brcmf_sdio_sdclk(bus, true);
                else if (bus->clkstate == CLK_AVAIL)
                        brcmf_sdio_htclk(bus, false, false);
                else
                        brcmf_err("request for %d -> %d\n",
                                  bus->clkstate, target);
                break;

        case CLK_NONE:
                /* Make sure to remove HT request */
                if (bus->clkstate == CLK_AVAIL)
                        brcmf_sdio_htclk(bus, false, false);
                /* Now remove the SD clock */
                brcmf_sdio_sdclk(bus, false);
                break;
        }
#ifdef DEBUG
        brcmf_dbg(SDIO, "%d -> %d\n", oldstate, bus->clkstate);
#endif                          /* DEBUG */

        return 0;
}

static int
brcmf_sdio_bus_sleep(struct brcmf_sdio *bus, bool sleep, bool pendok)
{
        int err = 0;
        u8 clkcsr;

        brcmf_dbg(SDIO, "Enter: request %s currently %s\n",
                  (sleep ? "SLEEP" : "WAKE"),
                  (bus->sleeping ? "SLEEP" : "WAKE"));

        /* If SR is enabled control bus state with KSO */
        if (bus->sr_enabled) {
                /* Done if we're already in the requested state */
                if (sleep == bus->sleeping)
                        goto end;

                /* Going to sleep */
                if (sleep) {
                        clkcsr = brcmf_sdiod_regrb(bus->sdiodev,
                                                   SBSDIO_FUNC1_CHIPCLKCSR,
                                                   &err);
                        if ((clkcsr & SBSDIO_CSR_MASK) == 0) {
                                brcmf_dbg(SDIO, "no clock, set ALP\n");
                                brcmf_sdiod_regwb(bus->sdiodev,
                                                  SBSDIO_FUNC1_CHIPCLKCSR,
                                                  SBSDIO_ALP_AVAIL_REQ, &err);
                        }
                        err = brcmf_sdio_kso_control(bus, false);
                } else {
                        err = brcmf_sdio_kso_control(bus, true);
                }
                if (err) {
                        brcmf_err("error while changing bus sleep state %d\n",
                                  err);
                        goto done;
                }
        }

end:
        /* control clocks */
        if (sleep) {
                if (!bus->sr_enabled)
                        brcmf_sdio_clkctl(bus, CLK_NONE, pendok);
        } else {
                brcmf_sdio_clkctl(bus, CLK_AVAIL, pendok);
                brcmf_sdio_wd_timer(bus, true);
        }
        bus->sleeping = sleep;
        brcmf_dbg(SDIO, "new state %s\n",
                  (sleep ? "SLEEP" : "WAKE"));
done:
        brcmf_dbg(SDIO, "Exit: err=%d\n", err);
        return err;

}

#ifdef DEBUG
static inline bool brcmf_sdio_valid_shared_address(u32 addr)
{
        return !(addr == 0 || ((~addr >> 16) & 0xffff) == (addr & 0xffff));
}

static int brcmf_sdio_readshared(struct brcmf_sdio *bus,
                                 struct sdpcm_shared *sh)
{
        u32 addr = 0;
        int rv;
        u32 shaddr = 0;
        struct sdpcm_shared_le sh_le;
        __le32 addr_le;

        sdio_claim_host(bus->sdiodev->func[1]);
        brcmf_sdio_bus_sleep(bus, false, false);

        /*
         * Read last word in socram to determine
         * address of sdpcm_shared structure

         */
        shaddr = bus->ci->rambase + bus->ci->ramsize - 4;
        if (!bus->ci->rambase && brcmf_chip_sr_capable(bus->ci))
                shaddr -= bus->ci->srsize;
        rv = brcmf_sdiod_ramrw(bus->sdiodev, false, shaddr,
                               (u8 *)&addr_le, 4);
        if (rv < 0)
                goto fail;

        /*
         * Check if addr is valid.
         * NVRAM length at the end of memory should have been overwritten.
         */
        addr = le32_to_cpu(addr_le);
        if (!brcmf_sdio_valid_shared_address(addr)) {
                brcmf_err("invalid sdpcm_shared address 0x%08X\n", addr);
                rv = -EINVAL;
                goto fail;
        }

        brcmf_dbg(INFO, "sdpcm_shared address 0x%08X\n", addr);

        /* Read hndrte_shared structure */
        rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr, (u8 *)&sh_le,
                               sizeof(struct sdpcm_shared_le));
        if (rv < 0)
                goto fail;

        sdio_release_host(bus->sdiodev->func[1]);

        /* Endianness */
        sh->flags = le32_to_cpu(sh_le.flags);
        sh->trap_addr = le32_to_cpu(sh_le.trap_addr);
        sh->assert_exp_addr = le32_to_cpu(sh_le.assert_exp_addr);
        sh->assert_file_addr = le32_to_cpu(sh_le.assert_file_addr);
        sh->assert_line = le32_to_cpu(sh_le.assert_line);
        sh->console_addr = le32_to_cpu(sh_le.console_addr);
        sh->msgtrace_addr = le32_to_cpu(sh_le.msgtrace_addr);

        if ((sh->flags & SDPCM_SHARED_VERSION_MASK) > SDPCM_SHARED_VERSION) {
                brcmf_err("sdpcm shared version unsupported: dhd %d dongle %d\n",
                          SDPCM_SHARED_VERSION,
                          sh->flags & SDPCM_SHARED_VERSION_MASK);
                return -EPROTO;
        }
        return 0;

fail:
        brcmf_err("unable to obtain sdpcm_shared info: rv=%d (addr=0x%x)\n",
                  rv, addr);
        sdio_release_host(bus->sdiodev->func[1]);
        return rv;
}

static void brcmf_sdio_get_console_addr(struct brcmf_sdio *bus)
{
        struct sdpcm_shared sh;

        if (brcmf_sdio_readshared(bus, &sh) == 0)
                bus->console_addr = sh.console_addr;
}
#else
static void brcmf_sdio_get_console_addr(struct brcmf_sdio *bus)
{
}
#endif /* DEBUG */

static u32 brcmf_sdio_hostmail(struct brcmf_sdio *bus)
{
        u32 intstatus = 0;
        u32 hmb_data;
        u8 fcbits;
        int ret;

        brcmf_dbg(SDIO, "Enter\n");

        /* Read mailbox data and ack that we did so */
        ret = r_sdreg32(bus, &hmb_data,
                        offsetof(struct sdpcmd_regs, tohostmailboxdata));

        if (ret == 0)
                w_sdreg32(bus, SMB_INT_ACK,
                          offsetof(struct sdpcmd_regs, tosbmailbox));
        bus->sdcnt.f1regdata += 2;

        /* Dongle recomposed rx frames, accept them again */
        if (hmb_data & HMB_DATA_NAKHANDLED) {
                brcmf_dbg(SDIO, "Dongle reports NAK handled, expect rtx of %d\n",
                          bus->rx_seq);
                if (!bus->rxskip)
                        brcmf_err("unexpected NAKHANDLED!\n");

                bus->rxskip = false;
                intstatus |= I_HMB_FRAME_IND;
        }

        /*
         * DEVREADY does not occur with gSPI.
         */
        if (hmb_data & (HMB_DATA_DEVREADY | HMB_DATA_FWREADY)) {
                bus->sdpcm_ver =
                    (hmb_data & HMB_DATA_VERSION_MASK) >>
                    HMB_DATA_VERSION_SHIFT;
                if (bus->sdpcm_ver != SDPCM_PROT_VERSION)
                        brcmf_err("Version mismatch, dongle reports %d, "
                                  "expecting %d\n",
                                  bus->sdpcm_ver, SDPCM_PROT_VERSION);
                else
                        brcmf_dbg(SDIO, "Dongle ready, protocol version %d\n",
                                  bus->sdpcm_ver);

                /*
                 * Retrieve console state address now that firmware should have
                 * updated it.
                 */
                brcmf_sdio_get_console_addr(bus);
        }

        /*
         * Flow Control has been moved into the RX headers and this out of band
         * method isn't used any more.
         * remaining backward compatible with older dongles.
         */
        if (hmb_data & HMB_DATA_FC) {
                fcbits = (hmb_data & HMB_DATA_FCDATA_MASK) >>
                                                        HMB_DATA_FCDATA_SHIFT;

                if (fcbits & ~bus->flowcontrol)
                        bus->sdcnt.fc_xoff++;

                if (bus->flowcontrol & ~fcbits)
                        bus->sdcnt.fc_xon++;

                bus->sdcnt.fc_rcvd++;
                bus->flowcontrol = fcbits;
        }

        /* Shouldn't be any others */
        if (hmb_data & ~(HMB_DATA_DEVREADY |
                         HMB_DATA_NAKHANDLED |
                         HMB_DATA_FC |
                         HMB_DATA_FWREADY |
                         HMB_DATA_FCDATA_MASK | HMB_DATA_VERSION_MASK))
                brcmf_err("Unknown mailbox data content: 0x%02x\n",
                          hmb_data);

        return intstatus;
}

static void brcmf_sdio_rxfail(struct brcmf_sdio *bus, bool abort, bool rtx)
{
        uint retries = 0;
        u16 lastrbc;
        u8 hi, lo;
        int err;

        brcmf_err("%sterminate frame%s\n",
                  abort ? "abort command, " : "",
                  rtx ? ", send NAK" : "");

        if (abort)
                brcmf_sdiod_abort(bus->sdiodev, SDIO_FUNC_2);

        brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
                          SFC_RF_TERM, &err);
        bus->sdcnt.f1regdata++;

        /* Wait until the packet has been flushed (device/FIFO stable) */
        for (lastrbc = retries = 0xffff; retries > 0; retries--) {
                hi = brcmf_sdiod_regrb(bus->sdiodev,
                                       SBSDIO_FUNC1_RFRAMEBCHI, &err);
                lo = brcmf_sdiod_regrb(bus->sdiodev,
                                       SBSDIO_FUNC1_RFRAMEBCLO, &err);
                bus->sdcnt.f1regdata += 2;

                if ((hi == 0) && (lo == 0))
                        break;

                if ((hi > (lastrbc >> 8)) && (lo > (lastrbc & 0x00ff))) {
                        brcmf_err("count growing: last 0x%04x now 0x%04x\n",
                                  lastrbc, (hi << 8) + lo);
                }
                lastrbc = (hi << 8) + lo;
        }

        if (!retries)
                brcmf_err("count never zeroed: last 0x%04x\n", lastrbc);
        else
                brcmf_dbg(SDIO, "flush took %d iterations\n", 0xffff - retries);

        if (rtx) {
                bus->sdcnt.rxrtx++;
                err = w_sdreg32(bus, SMB_NAK,
                                offsetof(struct sdpcmd_regs, tosbmailbox));

                bus->sdcnt.f1regdata++;
                if (err == 0)
                        bus->rxskip = true;
        }

        /* Clear partial in any case */
        bus->cur_read.len = 0;
}

static void brcmf_sdio_txfail(struct brcmf_sdio *bus)
{
        struct brcmf_sdio_dev *sdiodev = bus->sdiodev;
        u8 i, hi, lo;

        /* On failure, abort the command and terminate the frame */
        brcmf_err("sdio error, abort command and terminate frame\n");
        bus->sdcnt.tx_sderrs++;

        brcmf_sdiod_abort(sdiodev, SDIO_FUNC_2);
        brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_FRAMECTRL, SFC_WF_TERM, NULL);
        bus->sdcnt.f1regdata++;

        for (i = 0; i < 3; i++) {
                hi = brcmf_sdiod_regrb(sdiodev, SBSDIO_FUNC1_WFRAMEBCHI, NULL);
                lo = brcmf_sdiod_regrb(sdiodev, SBSDIO_FUNC1_WFRAMEBCLO, NULL);
                bus->sdcnt.f1regdata += 2;
                if ((hi == 0) && (lo == 0))
                        break;
        }
}

/* return total length of buffer chain */
static uint brcmf_sdio_glom_len(struct brcmf_sdio *bus)
{
        struct sk_buff *p;
        uint total;

        total = 0;
        skb_queue_walk(&bus->glom, p)
                total += p->len;
        return total;
}

static void brcmf_sdio_free_glom(struct brcmf_sdio *bus)
{
        struct sk_buff *cur, *next;

        skb_queue_walk_safe(&bus->glom, cur, next) {
                skb_unlink(cur, &bus->glom);
                brcmu_pkt_buf_free_skb(cur);
        }
}

/**
 * brcmfmac sdio bus specific header
 * This is the lowest layer header wrapped on the packets transmitted between
 * host and WiFi dongle which contains information needed for SDIO core and
 * firmware
 *
 * It consists of 3 parts: hardware header, hardware extension header and
 * software header
 * hardware header (frame tag) - 4 bytes
 * Byte 0~1: Frame length
 * Byte 2~3: Checksum, bit-wise inverse of frame length
 * hardware extension header - 8 bytes
 * Tx glom mode only, N/A for Rx or normal Tx
 * Byte 0~1: Packet length excluding hw frame tag
 * Byte 2: Reserved
 * Byte 3: Frame flags, bit 0: last frame indication
 * Byte 4~5: Reserved
 * Byte 6~7: Tail padding length
 * software header - 8 bytes
 * Byte 0: Rx/Tx sequence number
 * Byte 1: 4 MSB Channel number, 4 LSB arbitrary flag
 * Byte 2: Length of next data frame, reserved for Tx
 * Byte 3: Data offset
 * Byte 4: Flow control bits, reserved for Tx
 * Byte 5: Maximum Sequence number allowed by firmware for Tx, N/A for Tx packet
 * Byte 6~7: Reserved
 */
#define SDPCM_HWHDR_LEN                 4
#define SDPCM_HWEXT_LEN                 8
#define SDPCM_SWHDR_LEN                 8
#define SDPCM_HDRLEN                    (SDPCM_HWHDR_LEN + SDPCM_SWHDR_LEN)
/* software header */
#define SDPCM_SEQ_MASK                  0x000000ff
#define SDPCM_SEQ_WRAP                  256
#define SDPCM_CHANNEL_MASK              0x00000f00
#define SDPCM_CHANNEL_SHIFT             8
#define SDPCM_CONTROL_CHANNEL           0       /* Control */
#define SDPCM_EVENT_CHANNEL             1       /* Asyc Event Indication */
#define SDPCM_DATA_CHANNEL              2       /* Data Xmit/Recv */
#define SDPCM_GLOM_CHANNEL              3       /* Coalesced packets */
#define SDPCM_TEST_CHANNEL              15      /* Test/debug packets */
#define SDPCM_GLOMDESC(p)               (((u8 *)p)[1] & 0x80)
#define SDPCM_NEXTLEN_MASK              0x00ff0000
#define SDPCM_NEXTLEN_SHIFT             16
#define SDPCM_DOFFSET_MASK              0xff000000
#define SDPCM_DOFFSET_SHIFT             24
#define SDPCM_FCMASK_MASK               0x000000ff
#define SDPCM_WINDOW_MASK               0x0000ff00
#define SDPCM_WINDOW_SHIFT              8

static inline u8 brcmf_sdio_getdatoffset(u8 *swheader)
{
        u32 hdrvalue;
        hdrvalue = *(u32 *)swheader;
        return (u8)((hdrvalue & SDPCM_DOFFSET_MASK) >> SDPCM_DOFFSET_SHIFT);
}

static inline bool brcmf_sdio_fromevntchan(u8 *swheader)
{
        u32 hdrvalue;
        u8 ret;

        hdrvalue = *(u32 *)swheader;
        ret = (u8)((hdrvalue & SDPCM_CHANNEL_MASK) >> SDPCM_CHANNEL_SHIFT);

        return (ret == SDPCM_EVENT_CHANNEL);
}

static int brcmf_sdio_hdparse(struct brcmf_sdio *bus, u8 *header,
                              struct brcmf_sdio_hdrinfo *rd,
                              enum brcmf_sdio_frmtype type)
{
        u16 len, checksum;
        u8 rx_seq, fc, tx_seq_max;
        u32 swheader;

        trace_brcmf_sdpcm_hdr(SDPCM_RX, header);

        /* hw header */
        len = get_unaligned_le16(header);
        checksum = get_unaligned_le16(header + sizeof(u16));
        /* All zero means no more to read */
        if (!(len | checksum)) {
                bus->rxpending = false;
                return -ENODATA;
        }
        if ((u16)(~(len ^ checksum))) {
                brcmf_err("HW header checksum error\n");
                bus->sdcnt.rx_badhdr++;
                brcmf_sdio_rxfail(bus, false, false);
                return -EIO;
        }
        if (len < SDPCM_HDRLEN) {
                brcmf_err("HW header length error\n");
                return -EPROTO;
        }
        if (type == BRCMF_SDIO_FT_SUPER &&
            (roundup(len, bus->blocksize) != rd->len)) {
                brcmf_err("HW superframe header length error\n");
                return -EPROTO;
        }
        if (type == BRCMF_SDIO_FT_SUB && len > rd->len) {
                brcmf_err("HW subframe header length error\n");
                return -EPROTO;
        }
        rd->len = len;

        /* software header */
        header += SDPCM_HWHDR_LEN;
        swheader = le32_to_cpu(*(__le32 *)header);
        if (type == BRCMF_SDIO_FT_SUPER && SDPCM_GLOMDESC(header)) {
                brcmf_err("Glom descriptor found in superframe head\n");
                rd->len = 0;
                return -EINVAL;
        }
        rx_seq = (u8)(swheader & SDPCM_SEQ_MASK);
        rd->channel = (swheader & SDPCM_CHANNEL_MASK) >> SDPCM_CHANNEL_SHIFT;
        if (len > MAX_RX_DATASZ && rd->channel != SDPCM_CONTROL_CHANNEL &&
            type != BRCMF_SDIO_FT_SUPER) {
                brcmf_err("HW header length too long\n");
                bus->sdcnt.rx_toolong++;
                brcmf_sdio_rxfail(bus, false, false);
                rd->len = 0;
                return -EPROTO;
        }
        if (type == BRCMF_SDIO_FT_SUPER && rd->channel != SDPCM_GLOM_CHANNEL) {
                brcmf_err("Wrong channel for superframe\n");
                rd->len = 0;
                return -EINVAL;
        }
        if (type == BRCMF_SDIO_FT_SUB && rd->channel != SDPCM_DATA_CHANNEL &&
            rd->channel != SDPCM_EVENT_CHANNEL) {
                brcmf_err("Wrong channel for subframe\n");
                rd->len = 0;
                return -EINVAL;
        }
        rd->dat_offset = brcmf_sdio_getdatoffset(header);
        if (rd->dat_offset < SDPCM_HDRLEN || rd->dat_offset > rd->len) {
                brcmf_err("seq %d: bad data offset\n", rx_seq);
                bus->sdcnt.rx_badhdr++;
                brcmf_sdio_rxfail(bus, false, false);
                rd->len = 0;
                return -ENXIO;
        }
        if (rd->seq_num != rx_seq) {
                brcmf_dbg(SDIO, "seq %d, expected %d\n", rx_seq, rd->seq_num);
                bus->sdcnt.rx_badseq++;
                rd->seq_num = rx_seq;
        }
        /* no need to check the reset for subframe */
        if (type == BRCMF_SDIO_FT_SUB)
                return 0;
        rd->len_nxtfrm = (swheader & SDPCM_NEXTLEN_MASK) >> SDPCM_NEXTLEN_SHIFT;
        if (rd->len_nxtfrm << 4 > MAX_RX_DATASZ) {
                /* only warm for NON glom packet */
                if (rd->channel != SDPCM_GLOM_CHANNEL)
                        brcmf_err("seq %d: next length error\n", rx_seq);
                rd->len_nxtfrm = 0;
        }
        swheader = le32_to_cpu(*(__le32 *)(header + 4));
        fc = swheader & SDPCM_FCMASK_MASK;
        if (bus->flowcontrol != fc) {
                if (~bus->flowcontrol & fc)
                        bus->sdcnt.fc_xoff++;
                if (bus->flowcontrol & ~fc)
                        bus->sdcnt.fc_xon++;
                bus->sdcnt.fc_rcvd++;
                bus->flowcontrol = fc;
        }
        tx_seq_max = (swheader & SDPCM_WINDOW_MASK) >> SDPCM_WINDOW_SHIFT;
        if ((u8)(tx_seq_max - bus->tx_seq) > 0x40) {
                brcmf_err("seq %d: max tx seq number error\n", rx_seq);
                tx_seq_max = bus->tx_seq + 2;
        }
        bus->tx_max = tx_seq_max;

        return 0;
}

static inline void brcmf_sdio_update_hwhdr(u8 *header, u16 frm_length)
{
        *(__le16 *)header = cpu_to_le16(frm_length);
        *(((__le16 *)header) + 1) = cpu_to_le16(~frm_length);
}

static void brcmf_sdio_hdpack(struct brcmf_sdio *bus, u8 *header,
                              struct brcmf_sdio_hdrinfo *hd_info)
{
        u32 hdrval;
        u8 hdr_offset;

        brcmf_sdio_update_hwhdr(header, hd_info->len);
        hdr_offset = SDPCM_HWHDR_LEN;

        if (bus->txglom) {
                hdrval = (hd_info->len - hdr_offset) | (hd_info->lastfrm << 24);
                *((__le32 *)(header + hdr_offset)) = cpu_to_le32(hdrval);
                hdrval = (u16)hd_info->tail_pad << 16;
                *(((__le32 *)(header + hdr_offset)) + 1) = cpu_to_le32(hdrval);
                hdr_offset += SDPCM_HWEXT_LEN;
        }

        hdrval = hd_info->seq_num;
        hdrval |= (hd_info->channel << SDPCM_CHANNEL_SHIFT) &
                  SDPCM_CHANNEL_MASK;
        hdrval |= (hd_info->dat_offset << SDPCM_DOFFSET_SHIFT) &
                  SDPCM_DOFFSET_MASK;
        *((__le32 *)(header + hdr_offset)) = cpu_to_le32(hdrval);
        *(((__le32 *)(header + hdr_offset)) + 1) = 0;
        trace_brcmf_sdpcm_hdr(SDPCM_TX + !!(bus->txglom), header);
}

static u8 brcmf_sdio_rxglom(struct brcmf_sdio *bus, u8 rxseq)
{
        u16 dlen, totlen;
        u8 *dptr, num = 0;
        u16 sublen;
        struct sk_buff *pfirst, *pnext;

        int errcode;
        u8 doff, sfdoff;

        struct brcmf_sdio_hdrinfo rd_new;

        /* If packets, issue read(s) and send up packet chain */
        /* Return sequence numbers consumed? */

        brcmf_dbg(SDIO, "start: glomd %p glom %p\n",
                  bus->glomd, skb_peek(&bus->glom));

        /* If there's a descriptor, generate the packet chain */
        if (bus->glomd) {
                pfirst = pnext = NULL;
                dlen = (u16) (bus->glomd->len);
                dptr = bus->glomd->data;
                if (!dlen || (dlen & 1)) {
                        brcmf_err("bad glomd len(%d), ignore descriptor\n",
                                  dlen);
                        dlen = 0;
                }

                for (totlen = num = 0; dlen; num++) {
                        /* Get (and move past) next length */
                        sublen = get_unaligned_le16(dptr);
                        dlen -= sizeof(u16);
                        dptr += sizeof(u16);
                        if ((sublen < SDPCM_HDRLEN) ||
                            ((num == 0) && (sublen < (2 * SDPCM_HDRLEN)))) {
                                brcmf_err("descriptor len %d bad: %d\n",
                                          num, sublen);
                                pnext = NULL;
                                break;
                        }
                        if (sublen % bus->sgentry_align) {
                                brcmf_err("sublen %d not multiple of %d\n",
                                          sublen, bus->sgentry_align);
                        }
                        totlen += sublen;

                        /* For last frame, adjust read len so total
                                 is a block multiple */
                        if (!dlen) {
                                sublen +=
                                    (roundup(totlen, bus->blocksize) - totlen);
                                totlen = roundup(totlen, bus->blocksize);
                        }

                        /* Allocate/chain packet for next subframe */
                        pnext = brcmu_pkt_buf_get_skb(sublen + bus->sgentry_align);
                        if (pnext == NULL) {
                                brcmf_err("bcm_pkt_buf_get_skb failed, num %d len %d\n",
                                          num, sublen);
                                break;
                        }
                        skb_queue_tail(&bus->glom, pnext);

                        /* Adhere to start alignment requirements */
                        pkt_align(pnext, sublen, bus->sgentry_align);
                }

                /* If all allocations succeeded, save packet chain
                         in bus structure */
                if (pnext) {
                        brcmf_dbg(GLOM, "allocated %d-byte packet chain for %d subframes\n",
                                  totlen, num);
                        if (BRCMF_GLOM_ON() && bus->cur_read.len &&
                            totlen != bus->cur_read.len) {
                                brcmf_dbg(GLOM, "glomdesc mismatch: nextlen %d glomdesc %d rxseq %d\n",
                                          bus->cur_read.len, totlen, rxseq);
                        }
                        pfirst = pnext = NULL;
                } else {
                        brcmf_sdio_free_glom(bus);
                        num = 0;
                }

                /* Done with descriptor packet */
                brcmu_pkt_buf_free_skb(bus->glomd);
                bus->glomd = NULL;
                bus->cur_read.len = 0;
        }

        /* Ok -- either we just generated a packet chain,
                 or had one from before */
        if (!skb_queue_empty(&bus->glom)) {
                if (BRCMF_GLOM_ON()) {
                        brcmf_dbg(GLOM, "try superframe read, packet chain:\n");
                        skb_queue_walk(&bus->glom, pnext) {
                                brcmf_dbg(GLOM, "    %p: %p len 0x%04x (%d)\n",
                                          pnext, (u8 *) (pnext->data),
                                          pnext->len, pnext->len);
                        }
                }

                pfirst = skb_peek(&bus->glom);
                dlen = (u16) brcmf_sdio_glom_len(bus);

                /* Do an SDIO read for the superframe.  Configurable iovar to
                 * read directly into the chained packet, or allocate a large
                 * packet and and copy into the chain.
                 */
                sdio_claim_host(bus->sdiodev->func[1]);
                errcode = brcmf_sdiod_recv_chain(bus->sdiodev,
                                                 &bus->glom, dlen);
                sdio_release_host(bus->sdiodev->func[1]);
                bus->sdcnt.f2rxdata++;

                /* On failure, kill the superframe */
                if (errcode < 0) {
                        brcmf_err("glom read of %d bytes failed: %d\n",
                                  dlen, errcode);

                        sdio_claim_host(bus->sdiodev->func[1]);
                        brcmf_sdio_rxfail(bus, true, false);
                        bus->sdcnt.rxglomfail++;
                        brcmf_sdio_free_glom(bus);
                        sdio_release_host(bus->sdiodev->func[1]);
                        return 0;
                }

                brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
                                   pfirst->data, min_t(int, pfirst->len, 48),
                                   "SUPERFRAME:\n");

                rd_new.seq_num = rxseq;
                rd_new.len = dlen;
                sdio_claim_host(bus->sdiodev->func[1]);
                errcode = brcmf_sdio_hdparse(bus, pfirst->data, &rd_new,
                                             BRCMF_SDIO_FT_SUPER);
                sdio_release_host(bus->sdiodev->func[1]);
                bus->cur_read.len = rd_new.len_nxtfrm << 4;

                /* Remove superframe header, remember offset */
                skb_pull(pfirst, rd_new.dat_offset);
                sfdoff = rd_new.dat_offset;
                num = 0;

                /* Validate all the subframe headers */
                skb_queue_walk(&bus->glom, pnext) {
                        /* leave when invalid subframe is found */
                        if (errcode)
                                break;

                        rd_new.len = pnext->len;
                        rd_new.seq_num = rxseq++;
                        sdio_claim_host(bus->sdiodev->func[1]);
                        errcode = brcmf_sdio_hdparse(bus, pnext->data, &rd_new,
                                                     BRCMF_SDIO_FT_SUB);
                        sdio_release_host(bus->sdiodev->func[1]);
                        brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
                                           pnext->data, 32, "subframe:\n");

                        num++;
                }

                if (errcode) {
                        /* Terminate frame on error */
                        sdio_claim_host(bus->sdiodev->func[1]);
                        brcmf_sdio_rxfail(bus, true, false);
                        bus->sdcnt.rxglomfail++;
                        brcmf_sdio_free_glom(bus);
                        sdio_release_host(bus->sdiodev->func[1]);
                        bus->cur_read.len = 0;
                        return 0;
                }

                /* Basic SD framing looks ok - process each packet (header) */

                skb_queue_walk_safe(&bus->glom, pfirst, pnext) {
                        dptr = (u8 *) (pfirst->data);
                        sublen = get_unaligned_le16(dptr);
                        doff = brcmf_sdio_getdatoffset(&dptr[SDPCM_HWHDR_LEN]);

                        brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
                                           dptr, pfirst->len,
                                           "Rx Subframe Data:\n");

                        __skb_trim(pfirst, sublen);
                        skb_pull(pfirst, doff);

                        if (pfirst->len == 0) {
                                skb_unlink(pfirst, &bus->glom);
                                brcmu_pkt_buf_free_skb(pfirst);
                                continue;
                        }

                        brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
                                           pfirst->data,
                                           min_t(int, pfirst->len, 32),
                                           "subframe %d to stack, %p (%p/%d) nxt/lnk %p/%p\n",
                                           bus->glom.qlen, pfirst, pfirst->data,
                                           pfirst->len, pfirst->next,
                                           pfirst->prev);
                        skb_unlink(pfirst, &bus->glom);
                        if (brcmf_sdio_fromevntchan(pfirst->data))
                                brcmf_rx_event(bus->sdiodev->dev, pfirst);
                        else
                                brcmf_rx_frame(bus->sdiodev->dev, pfirst,
                                               false);
                        bus->sdcnt.rxglompkts++;
                }

                bus->sdcnt.rxglomframes++;
        }
        return num;
}

static int brcmf_sdio_dcmd_resp_wait(struct brcmf_sdio *bus, uint *condition,
                                     bool *pending)
{
        DECLARE_WAITQUEUE(wait, current);
        int timeout = DCMD_RESP_TIMEOUT;

        /* Wait until control frame is available */
        add_wait_queue(&bus->dcmd_resp_wait, &wait);
        set_current_state(TASK_INTERRUPTIBLE);

        while (!(*condition) && (!signal_pending(current) && timeout))
                timeout = schedule_timeout(timeout);

        if (signal_pending(current))
                *pending = true;

        set_current_state(TASK_RUNNING);
        remove_wait_queue(&bus->dcmd_resp_wait, &wait);

        return timeout;
}

static int brcmf_sdio_dcmd_resp_wake(struct brcmf_sdio *bus)
{
        wake_up_interruptible(&bus->dcmd_resp_wait);

        return 0;
}
static void
brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)
{
        uint rdlen, pad;
        u8 *buf = NULL, *rbuf;
        int sdret;

        brcmf_dbg(TRACE, "Enter\n");

        if (bus->rxblen)
                buf = vzalloc(bus->rxblen);
        if (!buf)
                goto done;

        rbuf = bus->rxbuf;
        pad = ((unsigned long)rbuf % bus->head_align);
        if (pad)
                rbuf += (bus->head_align - pad);

        /* Copy the already-read portion over */
        memcpy(buf, hdr, BRCMF_FIRSTREAD);
        if (len <= BRCMF_FIRSTREAD)
                goto gotpkt;

        /* Raise rdlen to next SDIO block to avoid tail command */
        rdlen = len - BRCMF_FIRSTREAD;
        if (bus->roundup && bus->blocksize && (rdlen > bus->blocksize)) {
                pad = bus->blocksize - (rdlen % bus->blocksize);
                if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
                    ((len + pad) < bus->sdiodev->bus_if->maxctl))
                        rdlen += pad;
        } else if (rdlen % bus->head_align) {
                rdlen += bus->head_align - (rdlen % bus->head_align);
        }

        /* Drop if the read is too big or it exceeds our maximum */
        if ((rdlen + BRCMF_FIRSTREAD) > bus->sdiodev->bus_if->maxctl) {
                brcmf_err("%d-byte control read exceeds %d-byte buffer\n",
                          rdlen, bus->sdiodev->bus_if->maxctl);
                brcmf_sdio_rxfail(bus, false, false);
                goto done;
        }

        if ((len - doff) > bus->sdiodev->bus_if->maxctl) {
                brcmf_err("%d-byte ctl frame (%d-byte ctl data) exceeds %d-byte limit\n",
                          len, len - doff, bus->sdiodev->bus_if->maxctl);
                bus->sdcnt.rx_toolong++;
                brcmf_sdio_rxfail(bus, false, false);
                goto done;
        }

        /* Read remain of frame body */
        sdret = brcmf_sdiod_recv_buf(bus->sdiodev, rbuf, rdlen);
        bus->sdcnt.f2rxdata++;

        /* Control frame failures need retransmission */
        if (sdret < 0) {
                brcmf_err("read %d control bytes failed: %d\n",
                          rdlen, sdret);
                bus->sdcnt.rxc_errors++;
                brcmf_sdio_rxfail(bus, true, true);
                goto done;
        } else
                memcpy(buf + BRCMF_FIRSTREAD, rbuf, rdlen);

gotpkt:

        brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
                           buf, len, "RxCtrl:\n");

        /* Point to valid data and indicate its length */
        spin_lock_bh(&bus->rxctl_lock);
        if (bus->rxctl) {
                brcmf_err("last control frame is being processed.\n");
                spin_unlock_bh(&bus->rxctl_lock);
                vfree(buf);
                goto done;
        }
        bus->rxctl = buf + doff;
        bus->rxctl_orig = buf;
        bus->rxlen = len - doff;
        spin_unlock_bh(&bus->rxctl_lock);

done:
        /* Awake any waiters */
        brcmf_sdio_dcmd_resp_wake(bus);
}

/* Pad read to blocksize for efficiency */
static void brcmf_sdio_pad(struct brcmf_sdio *bus, u16 *pad, u16 *rdlen)
{
        if (bus->roundup && bus->blocksize && *rdlen > bus->blocksize) {
                *pad = bus->blocksize - (*rdlen % bus->blocksize);
                if (*pad <= bus->roundup && *pad < bus->blocksize &&
                    *rdlen + *pad + BRCMF_FIRSTREAD < MAX_RX_DATASZ)
                        *rdlen += *pad;
        } else if (*rdlen % bus->head_align) {
                *rdlen += bus->head_align - (*rdlen % bus->head_align);
        }
}

static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)
{
        struct sk_buff *pkt;            /* Packet for event or data frames */
        u16 pad;                /* Number of pad bytes to read */
        uint rxleft = 0;        /* Remaining number of frames allowed */
        int ret;                /* Return code from calls */
        uint rxcount = 0;       /* Total frames read */
        struct brcmf_sdio_hdrinfo *rd = &bus->cur_read, rd_new;
        u8 head_read = 0;

        brcmf_dbg(TRACE, "Enter\n");

        /* Not finished unless we encounter no more frames indication */
        bus->rxpending = true;

        for (rd->seq_num = bus->rx_seq, rxleft = maxframes;
             !bus->rxskip && rxleft && bus->sdiodev->state == BRCMF_SDIOD_DATA;
             rd->seq_num++, rxleft--) {

                /* Handle glomming separately */
                if (bus->glomd || !skb_queue_empty(&bus->glom)) {
                        u8 cnt;
                        brcmf_dbg(GLOM, "calling rxglom: glomd %p, glom %p\n",
                                  bus->glomd, skb_peek(&bus->glom));
                        cnt = brcmf_sdio_rxglom(bus, rd->seq_num);
                        brcmf_dbg(GLOM, "rxglom returned %d\n", cnt);
                        rd->seq_num += cnt - 1;
                        rxleft = (rxleft > cnt) ? (rxleft - cnt) : 1;
                        continue;
                }

                rd->len_left = rd->len;
                /* read header first for unknow frame length */
                sdio_claim_host(bus->sdiodev->func[1]);
                if (!rd->len) {
                        ret = brcmf_sdiod_recv_buf(bus->sdiodev,
                                                   bus->rxhdr, BRCMF_FIRSTREAD);
                        bus->sdcnt.f2rxhdrs++;
                        if (ret < 0) {
                                brcmf_err("RXHEADER FAILED: %d\n",
                                          ret);
                                bus->sdcnt.rx_hdrfail++;
                                brcmf_sdio_rxfail(bus, true, true);
                                sdio_release_host(bus->sdiodev->func[1]);
                                continue;
                        }

                        brcmf_dbg_hex_dump(BRCMF_BYTES_ON() || BRCMF_HDRS_ON(),
                                           bus->rxhdr, SDPCM_HDRLEN,
                                           "RxHdr:\n");

                        if (brcmf_sdio_hdparse(bus, bus->rxhdr, rd,
                                               BRCMF_SDIO_FT_NORMAL)) {
                                sdio_release_host(bus->sdiodev->func[1]);
                                if (!bus->rxpending)
                                        break;
                                else
                                        continue;
                        }

                        if (rd->channel == SDPCM_CONTROL_CHANNEL) {
                                brcmf_sdio_read_control(bus, bus->rxhdr,
                                                        rd->len,
                                                        rd->dat_offset);
                                /* prepare the descriptor for the next read */
                                rd->len = rd->len_nxtfrm << 4;
                                rd->len_nxtfrm = 0;
                                /* treat all packet as event if we don't know */
                                rd->channel = SDPCM_EVENT_CHANNEL;
                                sdio_release_host(bus->sdiodev->func[1]);
                                continue;
                        }
                        rd->len_left = rd->len > BRCMF_FIRSTREAD ?
                                       rd->len - BRCMF_FIRSTREAD : 0;
                        head_read = BRCMF_FIRSTREAD;
                }

                brcmf_sdio_pad(bus, &pad, &rd->len_left);

                pkt = brcmu_pkt_buf_get_skb(rd->len_left + head_read +
                                            bus->head_align);
                if (!pkt) {
                        /* Give up on data, request rtx of events */
                        brcmf_err("brcmu_pkt_buf_get_skb failed\n");
                        brcmf_sdio_rxfail(bus, false,
                                            RETRYCHAN(rd->channel));
                        sdio_release_host(bus->sdiodev->func[1]);
                        continue;
                }
                skb_pull(pkt, head_read);
                pkt_align(pkt, rd->len_left, bus->head_align);

                ret = brcmf_sdiod_recv_pkt(bus->sdiodev, pkt);
                bus->sdcnt.f2rxdata++;
                sdio_release_host(bus->sdiodev->func[1]);

                if (ret < 0) {
                        brcmf_err("read %d bytes from channel %d failed: %d\n",
                                  rd->len, rd->channel, ret);
                        brcmu_pkt_buf_free_skb(pkt);
                        sdio_claim_host(bus->sdiodev->func[1]);
                        brcmf_sdio_rxfail(bus, true,
                                            RETRYCHAN(rd->channel));
                        sdio_release_host(bus->sdiodev->func[1]);
                        continue;
                }

                if (head_read) {
                        skb_push(pkt, head_read);
                        memcpy(pkt->data, bus->rxhdr, head_read);
                        head_read = 0;
                } else {
                        memcpy(bus->rxhdr, pkt->data, SDPCM_HDRLEN);
                        rd_new.seq_num = rd->seq_num;
                        sdio_claim_host(bus->sdiodev->func[1]);
                        if (brcmf_sdio_hdparse(bus, bus->rxhdr, &rd_new,
                                               BRCMF_SDIO_FT_NORMAL)) {
                                rd->len = 0;
                                brcmu_pkt_buf_free_skb(pkt);
                        }
                        bus->sdcnt.rx_readahead_cnt++;
                        if (rd->len != roundup(rd_new.len, 16)) {
                                brcmf_err("frame length mismatch:read %d, should be %d\n",
                                          rd->len,
                                          roundup(rd_new.len, 16) >> 4);
                                rd->len = 0;
                                brcmf_sdio_rxfail(bus, true, true);
                                sdio_release_host(bus->sdiodev->func[1]);
                                brcmu_pkt_buf_free_skb(pkt);
                                continue;
                        }
                        sdio_release_host(bus->sdiodev->func[1]);
                        rd->len_nxtfrm = rd_new.len_nxtfrm;
                        rd->channel = rd_new.channel;
                        rd->dat_offset = rd_new.dat_offset;

                        brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() &&
                                             BRCMF_DATA_ON()) &&
                                           BRCMF_HDRS_ON(),
                                           bus->rxhdr, SDPCM_HDRLEN,
                                           "RxHdr:\n");

                        if (rd_new.channel == SDPCM_CONTROL_CHANNEL) {
                                brcmf_err("readahead on control packet %d?\n",
                                          rd_new.seq_num);
                                /* Force retry w/normal header read */
                                rd->len = 0;
                                sdio_claim_host(bus->sdiodev->func[1]);
                                brcmf_sdio_rxfail(bus, false, true);
                                sdio_release_host(bus->sdiodev->func[1]);
                                brcmu_pkt_buf_free_skb(pkt);
                                continue;
                        }
                }

                brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
                                   pkt->data, rd->len, "Rx Data:\n");

                /* Save superframe descriptor and allocate packet frame */
                if (rd->channel == SDPCM_GLOM_CHANNEL) {
                        if (SDPCM_GLOMDESC(&bus->rxhdr[SDPCM_HWHDR_LEN])) {
                                brcmf_dbg(GLOM, "glom descriptor, %d bytes:\n",
                                          rd->len);
                                brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
                                                   pkt->data, rd->len,
                                                   "Glom Data:\n");
                                __skb_trim(pkt, rd->len);
                                skb_pull(pkt, SDPCM_HDRLEN);
                                bus->glomd = pkt;
                        } else {
                                brcmf_err("%s: glom superframe w/o "
                                          "descriptor!\n", __func__);
                                sdio_claim_host(bus->sdiodev->func[1]);
                                brcmf_sdio_rxfail(bus, false, false);
                                sdio_release_host(bus->sdiodev->func[1]);
                        }
                        /* prepare the descriptor for the next read */
                        rd->len = rd->len_nxtfrm << 4;
                        rd->len_nxtfrm = 0;
                        /* treat all packet as event if we don't know */
                        rd->channel = SDPCM_EVENT_CHANNEL;
                        continue;
                }

                /* Fill in packet len and prio, deliver upward */
                __skb_trim(pkt, rd->len);
                skb_pull(pkt, rd->dat_offset);

                if (pkt->len == 0)
                        brcmu_pkt_buf_free_skb(pkt);
                else if (rd->channel == SDPCM_EVENT_CHANNEL)
                        brcmf_rx_event(bus->sdiodev->dev, pkt);
                else
                        brcmf_rx_frame(bus->sdiodev->dev, pkt,
                                       false);

                /* prepare the descriptor for the next read */
                rd->len = rd->len_nxtfrm << 4;
                rd->len_nxtfrm = 0;
                /* treat all packet as event if we don't know */
                rd->channel = SDPCM_EVENT_CHANNEL;
        }

        rxcount = maxframes - rxleft;
        /* Message if we hit the limit */
        if (!rxleft)
                brcmf_dbg(DATA, "hit rx limit of %d frames\n", maxframes);
        else
                brcmf_dbg(DATA, "processed %d frames\n", rxcount);
        /* Back off rxseq if awaiting rtx, update rx_seq */
        if (bus->rxskip)
                rd->seq_num--;
        bus->rx_seq = rd->seq_num;

        return rxcount;
}

static void
brcmf_sdio_wait_event_wakeup(struct brcmf_sdio *bus)
{
        wake_up_interruptible(&bus->ctrl_wait);
        return;
}

static int brcmf_sdio_txpkt_hdalign(struct brcmf_sdio *bus, struct sk_buff *pkt)
{
        u16 head_pad;
        u8 *dat_buf;

        dat_buf = (u8 *)(pkt->data);

        /* Check head padding */
        head_pad = ((unsigned long)dat_buf % bus->head_align);
        if (head_pad) {
                if (skb_headroom(pkt) < head_pad) {
                        bus->sdiodev->bus_if->tx_realloc++;
                        head_pad = 0;
                        if (skb_cow(pkt, head_pad))
                                return -ENOMEM;
                }
                skb_push(pkt, head_pad);
                dat_buf = (u8 *)(pkt->data);
                memset(dat_buf, 0, head_pad + bus->tx_hdrlen);
        }
        return head_pad;
}

/**
 * struct brcmf_skbuff_cb reserves first two bytes in sk_buff::cb for
 * bus layer usage.
 */
/* flag marking a dummy skb added for DMA alignment requirement */
#define ALIGN_SKB_FLAG          0x8000
/* bit mask of data length chopped from the previous packet */
#define ALIGN_SKB_CHOP_LEN_MASK 0x7fff

static int brcmf_sdio_txpkt_prep_sg(struct brcmf_sdio *bus,
                                    struct sk_buff_head *pktq,
                                    struct sk_buff *pkt, u16 total_len)
{
        struct brcmf_sdio_dev *sdiodev;
        struct sk_buff *pkt_pad;
        u16 tail_pad, tail_chop, chain_pad;
        unsigned int blksize;
        bool lastfrm;
        int ntail, ret;

        sdiodev = bus->sdiodev;
        blksize = sdiodev->func[SDIO_FUNC_2]->cur_blksize;
        /* sg entry alignment should be a divisor of block size */
        WARN_ON(blksize % bus->sgentry_align);

        /* Check tail padding */
        lastfrm = skb_queue_is_last(pktq, pkt);
        tail_pad = 0;
        tail_chop = pkt->len % bus->sgentry_align;
        if (tail_chop)
                tail_pad = bus->sgentry_align - tail_chop;
        chain_pad = (total_len + tail_pad) % blksize;
        if (lastfrm && chain_pad)
                tail_pad += blksize - chain_pad;
        if (skb_tailroom(pkt) < tail_pad && pkt->len > blksize) {
                pkt_pad = brcmu_pkt_buf_get_skb(tail_pad + tail_chop +
                                                bus->head_align);
                if (pkt_pad == NULL)
                        return -ENOMEM;
                ret = brcmf_sdio_txpkt_hdalign(bus, pkt_pad);
                if (unlikely(ret < 0)) {
                        kfree_skb(pkt_pad);
                        return ret;
                }
                memcpy(pkt_pad->data,
                       pkt->data + pkt->len - tail_chop,
                       tail_chop);
                *(u16 *)(pkt_pad->cb) = ALIGN_SKB_FLAG + tail_chop;
                skb_trim(pkt, pkt->len - tail_chop);
                skb_trim(pkt_pad, tail_pad + tail_chop);
                __skb_queue_after(pktq, pkt, pkt_pad);
        } else {
                ntail = pkt->data_len + tail_pad -
                        (pkt->end - pkt->tail);
                if (skb_cloned(pkt) || ntail > 0)
                        if (pskb_expand_head(pkt, 0, ntail, GFP_ATOMIC))
                                return -ENOMEM;
                if (skb_linearize(pkt))
                        return -ENOMEM;
                __skb_put(pkt, tail_pad);
        }

        return tail_pad;
}

/**
 * brcmf_sdio_txpkt_prep - packet preparation for transmit
 * @bus: brcmf_sdio structure pointer
 * @pktq: packet list pointer
 * @chan: virtual channel to transmit the packet
 *
 * Processes to be applied to the packet
 *      - Align data buffer pointer
 *      - Align data buffer length
 *      - Prepare header
 * Return: negative value if there is error
 */
static int
brcmf_sdio_txpkt_prep(struct brcmf_sdio *bus, struct sk_buff_head *pktq,
                      uint chan)
{
        u16 head_pad, total_len;
        struct sk_buff *pkt_next;
        u8 txseq;
        int ret;
        struct brcmf_sdio_hdrinfo hd_info = {0};

        txseq = bus->tx_seq;
        total_len = 0;
        skb_queue_walk(pktq, pkt_next) {
                /* alignment packet inserted in previous
                 * loop cycle can be skipped as it is
                 * already properly aligned and does not
                 * need an sdpcm header.
                 */
                if (*(u16 *)(pkt_next->cb) & ALIGN_SKB_FLAG)
                        continue;

                /* align packet data pointer */
                ret = brcmf_sdio_txpkt_hdalign(bus, pkt_next);
                if (ret < 0)
                        return ret;
                head_pad = (u16)ret;
                if (head_pad)
                        memset(pkt_next->data + bus->tx_hdrlen, 0, head_pad);

                total_len += pkt_next->len;

                hd_info.len = pkt_next->len;
                hd_info.lastfrm = skb_queue_is_last(pktq, pkt_next);
                if (bus->txglom && pktq->qlen > 1) {
                        ret = brcmf_sdio_txpkt_prep_sg(bus, pktq,
                                                       pkt_next, total_len);
                        if (ret < 0)
                                return ret;
                        hd_info.tail_pad = (u16)ret;
                        total_len += (u16)ret;
                }

                hd_info.channel = chan;
                hd_info.dat_offset = head_pad + bus->tx_hdrlen;
                hd_info.seq_num = txseq++;

                /* Now fill the header */
                brcmf_sdio_hdpack(bus, pkt_next->data, &hd_info);

                if (BRCMF_BYTES_ON() &&
                    ((BRCMF_CTL_ON() && chan == SDPCM_CONTROL_CHANNEL) ||
                     (BRCMF_DATA_ON() && chan != SDPCM_CONTROL_CHANNEL)))
                        brcmf_dbg_hex_dump(true, pkt_next->data, hd_info.len,
                                           "Tx Frame:\n");
                else if (BRCMF_HDRS_ON())
                        brcmf_dbg_hex_dump(true, pkt_next->data,
                                           head_pad + bus->tx_hdrlen,
                                           "Tx Header:\n");
        }
        /* Hardware length tag of the first packet should be total
         * length of the chain (including padding)
         */
        if (bus->txglom)
                brcmf_sdio_update_hwhdr(pktq->next->data, total_len);
        return 0;
}

/**
 * brcmf_sdio_txpkt_postp - packet post processing for transmit
 * @bus: brcmf_sdio structure pointer
 * @pktq: packet list pointer
 *
 * Processes to be applied to the packet
 *      - Remove head padding
 *      - Remove tail padding
 */
static void
brcmf_sdio_txpkt_postp(struct brcmf_sdio *bus, struct sk_buff_head *pktq)
{
        u8 *hdr;
        u32 dat_offset;
        u16 tail_pad;
        u16 dummy_flags, chop_len;
        struct sk_buff *pkt_next, *tmp, *pkt_prev;

        skb_queue_walk_safe(pktq, pkt_next, tmp) {
                dummy_flags = *(u16 *)(pkt_next->cb);
                if (dummy_flags & ALIGN_SKB_FLAG) {
                        chop_len = dummy_flags & ALIGN_SKB_CHOP_LEN_MASK;
                        if (chop_len) {
                                pkt_prev = pkt_next->prev;
                                skb_put(pkt_prev, chop_len);
                        }
                        __skb_unlink(pkt_next, pktq);
                        brcmu_pkt_buf_free_skb(pkt_next);
                } else {
                        hdr = pkt_next->data + bus->tx_hdrlen - SDPCM_SWHDR_LEN;
                        dat_offset = le32_to_cpu(*(__le32 *)hdr);
                        dat_offset = (dat_offset & SDPCM_DOFFSET_MASK) >>
                                     SDPCM_DOFFSET_SHIFT;
                        skb_pull(pkt_next, dat_offset);
                        if (bus->txglom) {
                                tail_pad = le16_to_cpu(*(__le16 *)(hdr - 2));
                                skb_trim(pkt_next, pkt_next->len - tail_pad);
                        }
                }
        }
}

/* Writes a HW/SW header into the packet and sends it. */
/* Assumes: (a) header space already there, (b) caller holds lock */
static int brcmf_sdio_txpkt(struct brcmf_sdio *bus, struct sk_buff_head *pktq,
                            uint chan)
{
        int ret;
        struct sk_buff *pkt_next, *tmp;

        brcmf_dbg(TRACE, "Enter\n");

        ret = brcmf_sdio_txpkt_prep(bus, pktq, chan);
        if (ret)
                goto done;

        sdio_claim_host(bus->sdiodev->func[1]);
        ret = brcmf_sdiod_send_pkt(bus->sdiodev, pktq);
        bus->sdcnt.f2txdata++;

        if (ret < 0)
                brcmf_sdio_txfail(bus);

        sdio_release_host(bus->sdiodev->func[1]);

done:
        brcmf_sdio_txpkt_postp(bus, pktq);
        if (ret == 0)
                bus->tx_seq = (bus->tx_seq + pktq->qlen) % SDPCM_SEQ_WRAP;
        skb_queue_walk_safe(pktq, pkt_next, tmp) {
                __skb_unlink(pkt_next, pktq);
                brcmf_txcomplete(bus->sdiodev->dev, pkt_next, ret == 0);
        }
        return ret;
}

static uint brcmf_sdio_sendfromq(struct brcmf_sdio *bus, uint maxframes)
{
        struct sk_buff *pkt;
        struct sk_buff_head pktq;
        u32 intstatus = 0;
        int ret = 0, prec_out, i;
        uint cnt = 0;
        u8 tx_prec_map, pkt_num;

        brcmf_dbg(TRACE, "Enter\n");

        tx_prec_map = ~bus->flowcontrol;

        /* Send frames until the limit or some other event */
        for (cnt = 0; (cnt < maxframes) && data_ok(bus);) {
                pkt_num = 1;
                if (bus->txglom)
                        pkt_num = min_t(u8, bus->tx_max - bus->tx_seq,
                                        bus->sdiodev->txglomsz);
                pkt_num = min_t(u32, pkt_num,
                                brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol));
                __skb_queue_head_init(&pktq);
                spin_lock_bh(&bus->txq_lock);
                for (i = 0; i < pkt_num; i++) {
                        pkt = brcmu_pktq_mdeq(&bus->txq, tx_prec_map,
                                              &prec_out);
                        if (pkt == NULL)
                                break;
                        __skb_queue_tail(&pktq, pkt);
                }
                spin_unlock_bh(&bus->txq_lock);
                if (i == 0)
                        break;

                ret = brcmf_sdio_txpkt(bus, &pktq, SDPCM_DATA_CHANNEL);

                cnt += i;

                /* In poll mode, need to check for other events */
                if (!bus->intr) {
                        /* Check device status, signal pending interrupt */
                        sdio_claim_host(bus->sdiodev->func[1]);
                        ret = r_sdreg32(bus, &intstatus,
                                        offsetof(struct sdpcmd_regs,
                                                 intstatus));
                        sdio_release_host(bus->sdiodev->func[1]);
                        bus->sdcnt.f2txdata++;
                        if (ret != 0)
                                break;
                        if (intstatus & bus->hostintmask)
                                atomic_set(&bus->ipend, 1);
                }
        }

        /* Deflow-control stack if needed */
        if ((bus->sdiodev->state == BRCMF_SDIOD_DATA) &&
            bus->txoff && (pktq_len(&bus->txq) < TXLOW)) {
                bus->txoff = false;
                brcmf_txflowblock(bus->sdiodev->dev, false);
        }

        return cnt;
}

static int brcmf_sdio_tx_ctrlframe(struct brcmf_sdio *bus, u8 *frame, u16 len)
{
        u8 doff;
        u16 pad;
        uint retries = 0;
        struct brcmf_sdio_hdrinfo hd_info = {0};
        int ret;

        brcmf_dbg(TRACE, "Enter\n");

        /* Back the pointer to make room for bus header */
        frame -= bus->tx_hdrlen;
        len += bus->tx_hdrlen;

        /* Add alignment padding (optional for ctl frames) */
        doff = ((unsigned long)frame % bus->head_align);
        if (doff) {
                frame -= doff;
                len += doff;
                memset(frame + bus->tx_hdrlen, 0, doff);
        }

        /* Round send length to next SDIO block */
        pad = 0;
        if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
                pad = bus->blocksize - (len % bus->blocksize);
                if ((pad > bus->roundup) || (pad >= bus->blocksize))
                        pad = 0;
        } else if (len % bus->head_align) {
                pad = bus->head_align - (len % bus->head_align);
        }
        len += pad;

        hd_info.len = len - pad;
        hd_info.channel = SDPCM_CONTROL_CHANNEL;
        hd_info.dat_offset = doff + bus->tx_hdrlen;
        hd_info.seq_num = bus->tx_seq;
        hd_info.lastfrm = true;
        hd_info.tail_pad = pad;
        brcmf_sdio_hdpack(bus, frame, &hd_info);

        if (bus->txglom)
                brcmf_sdio_update_hwhdr(frame, len);

        brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
                           frame, len, "Tx Frame:\n");
        brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() && BRCMF_CTL_ON()) &&
                           BRCMF_HDRS_ON(),
                           frame, min_t(u16, len, 16), "TxHdr:\n");

        do {
                ret = brcmf_sdiod_send_buf(bus->sdiodev, frame, len);

                if (ret < 0)
                        brcmf_sdio_txfail(bus);
                else
                        bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQ_WRAP;
        } while (ret < 0 && retries++ < TXRETRIES);

        return ret;
}

static void brcmf_sdio_bus_stop(struct device *dev)
{
        u32 local_hostintmask;
        u8 saveclk;
        int err;
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
        struct brcmf_sdio *bus = sdiodev->bus;

        brcmf_dbg(TRACE, "Enter\n");

        if (bus->watchdog_tsk) {
                send_sig(SIGTERM, bus->watchdog_tsk, 1);
                kthread_stop(bus->watchdog_tsk);
                bus->watchdog_tsk = NULL;
        }

        if (sdiodev->state != BRCMF_SDIOD_NOMEDIUM) {
                sdio_claim_host(sdiodev->func[1]);

                /* Enable clock for device interrupts */
                brcmf_sdio_bus_sleep(bus, false, false);

                /* Disable and clear interrupts at the chip level also */
                w_sdreg32(bus, 0, offsetof(struct sdpcmd_regs, hostintmask));
                local_hostintmask = bus->hostintmask;
                bus->hostintmask = 0;

                /* Force backplane clocks to assure F2 interrupt propagates */
                saveclk = brcmf_sdiod_regrb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
                                            &err);
                if (!err)
                        brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
                                          (saveclk | SBSDIO_FORCE_HT), &err);
                if (err)
                        brcmf_err("Failed to force clock for F2: err %d\n",
                                  err);

                /* Turn off the bus (F2), free any pending packets */
                brcmf_dbg(INTR, "disable SDIO interrupts\n");
                sdio_disable_func(sdiodev->func[SDIO_FUNC_2]);

                /* Clear any pending interrupts now that F2 is disabled */
                w_sdreg32(bus, local_hostintmask,
                          offsetof(struct sdpcmd_regs, intstatus));

                sdio_release_host(sdiodev->func[1]);
        }
        /* Clear the data packet queues */
        brcmu_pktq_flush(&bus->txq, true, NULL, NULL);

        /* Clear any held glomming stuff */
        brcmu_pkt_buf_free_skb(bus->glomd);
        brcmf_sdio_free_glom(bus);

        /* Clear rx control and wake any waiters */
        spin_lock_bh(&bus->rxctl_lock);
        bus->rxlen = 0;
        spin_unlock_bh(&bus->rxctl_lock);
        brcmf_sdio_dcmd_resp_wake(bus);

        /* Reset some F2 state stuff */
        bus->rxskip = false;
        bus->tx_seq = bus->rx_seq = 0;
}

static inline void brcmf_sdio_clrintr(struct brcmf_sdio *bus)
{
        struct brcmf_sdio_dev *sdiodev;
        unsigned long flags;

        sdiodev = bus->sdiodev;
        if (sdiodev->oob_irq_requested) {
                spin_lock_irqsave(&sdiodev->irq_en_lock, flags);
                if (!sdiodev->irq_en && !atomic_read(&bus->ipend)) {
                        enable_irq(sdiodev->settings->bus.sdio.oob_irq_nr);
                        sdiodev->irq_en = true;
                }
                spin_unlock_irqrestore(&sdiodev->irq_en_lock, flags);
        }
}

static int brcmf_sdio_intr_rstatus(struct brcmf_sdio *bus)
{
        struct brcmf_core *buscore;
        u32 addr;
        unsigned long val;
        int ret;

        buscore = brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV);
        addr = buscore->base + offsetof(struct sdpcmd_regs, intstatus);

        val = brcmf_sdiod_regrl(bus->sdiodev, addr, &ret);
        bus->sdcnt.f1regdata++;
        if (ret != 0)
                return ret;

        val &= bus->hostintmask;
        atomic_set(&bus->fcstate, !!(val & I_HMB_FC_STATE));

        /* Clear interrupts */
        if (val) {
                brcmf_sdiod_regwl(bus->sdiodev, addr, val, &ret);
                bus->sdcnt.f1regdata++;
                atomic_or(val, &bus->intstatus);
        }

        return ret;
}

static void brcmf_sdio_dpc(struct brcmf_sdio *bus)
{
        u32 newstatus = 0;
        unsigned long intstatus;
        uint txlimit = bus->txbound;    /* Tx frames to send before resched */
        uint framecnt;                  /* Temporary counter of tx/rx frames */
        int err = 0;

        brcmf_dbg(TRACE, "Enter\n");

        sdio_claim_host(bus->sdiodev->func[1]);

        /* If waiting for HTAVAIL, check status */
        if (!bus->sr_enabled && bus->clkstate == CLK_PENDING) {
                u8 clkctl, devctl = 0;

#ifdef DEBUG
                /* Check for inconsistent device control */
                devctl = brcmf_sdiod_regrb(bus->sdiodev,
                                           SBSDIO_DEVICE_CTL, &err);
#endif                          /* DEBUG */

                /* Read CSR, if clock on switch to AVAIL, else ignore */
                clkctl = brcmf_sdiod_regrb(bus->sdiodev,
                                           SBSDIO_FUNC1_CHIPCLKCSR, &err);

                brcmf_dbg(SDIO, "DPC: PENDING, devctl 0x%02x clkctl 0x%02x\n",
                          devctl, clkctl);

                if (SBSDIO_HTAV(clkctl)) {
                        devctl = brcmf_sdiod_regrb(bus->sdiodev,
                                                   SBSDIO_DEVICE_CTL, &err);
                        devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
                        brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
                                          devctl, &err);
                        bus->clkstate = CLK_AVAIL;
                }
        }

        /* Make sure backplane clock is on */
        brcmf_sdio_bus_sleep(bus, false, true);

        /* Pending interrupt indicates new device status */
        if (atomic_read(&bus->ipend) > 0) {
                atomic_set(&bus->ipend, 0);
                err = brcmf_sdio_intr_rstatus(bus);
        }

        /* Start with leftover status bits */
        intstatus = atomic_xchg(&bus->intstatus, 0);

        /* Handle flow-control change: read new state in case our ack
         * crossed another change interrupt.  If change still set, assume
         * FC ON for safety, let next loop through do the debounce.
         */
        if (intstatus & I_HMB_FC_CHANGE) {
                intstatus &= ~I_HMB_FC_CHANGE;
                err = w_sdreg32(bus, I_HMB_FC_CHANGE,
                                offsetof(struct sdpcmd_regs, intstatus));

                err = r_sdreg32(bus, &newstatus,
                                offsetof(struct sdpcmd_regs, intstatus));
                bus->sdcnt.f1regdata += 2;
                atomic_set(&bus->fcstate,
                           !!(newstatus & (I_HMB_FC_STATE | I_HMB_FC_CHANGE)));
                intstatus |= (newstatus & bus->hostintmask);
        }

        /* Handle host mailbox indication */
        if (intstatus & I_HMB_HOST_INT) {
                intstatus &= ~I_HMB_HOST_INT;
                intstatus |= brcmf_sdio_hostmail(bus);
        }

        sdio_release_host(bus->sdiodev->func[1]);

        /* Generally don't ask for these, can get CRC errors... */
        if (intstatus & I_WR_OOSYNC) {
                brcmf_err("Dongle reports WR_OOSYNC\n");
                intstatus &= ~I_WR_OOSYNC;
        }

        if (intstatus & I_RD_OOSYNC) {
                brcmf_err("Dongle reports RD_OOSYNC\n");
                intstatus &= ~I_RD_OOSYNC;
        }

        if (intstatus & I_SBINT) {
                brcmf_err("Dongle reports SBINT\n");
                intstatus &= ~I_SBINT;
        }

        /* Would be active due to wake-wlan in gSPI */
        if (intstatus & I_CHIPACTIVE) {
                brcmf_dbg(INFO, "Dongle reports CHIPACTIVE\n");
                intstatus &= ~I_CHIPACTIVE;
        }

        /* Ignore frame indications if rxskip is set */
        if (bus->rxskip)
                intstatus &= ~I_HMB_FRAME_IND;

        /* On frame indication, read available frames */
        if ((intstatus & I_HMB_FRAME_IND) && (bus->clkstate == CLK_AVAIL)) {
                brcmf_sdio_readframes(bus, bus->rxbound);
                if (!bus->rxpending)
                        intstatus &= ~I_HMB_FRAME_IND;
        }

        /* Keep still-pending events for next scheduling */
        if (intstatus)
                atomic_or(intstatus, &bus->intstatus);

        brcmf_sdio_clrintr(bus);

        if (bus->ctrl_frame_stat && (bus->clkstate == CLK_AVAIL) &&
            data_ok(bus)) {
                sdio_claim_host(bus->sdiodev->func[1]);
                if (bus->ctrl_frame_stat) {
                        err = brcmf_sdio_tx_ctrlframe(bus,  bus->ctrl_frame_buf,
                                                      bus->ctrl_frame_len);
                        bus->ctrl_frame_err = err;
                        wmb();
                        bus->ctrl_frame_stat = false;
                }
                sdio_release_host(bus->sdiodev->func[1]);
                brcmf_sdio_wait_event_wakeup(bus);
        }
        /* Send queued frames (limit 1 if rx may still be pending) */
        if ((bus->clkstate == CLK_AVAIL) && !atomic_read(&bus->fcstate) &&
            brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) && txlimit &&
            data_ok(bus)) {
                framecnt = bus->rxpending ? min(txlimit, bus->txminmax) :
                                            txlimit;
                brcmf_sdio_sendfromq(bus, framecnt);
        }

        if ((bus->sdiodev->state != BRCMF_SDIOD_DATA) || (err != 0)) {
                brcmf_err("failed backplane access over SDIO, halting operation\n");
                atomic_set(&bus->intstatus, 0);
                if (bus->ctrl_frame_stat) {
                        sdio_claim_host(bus->sdiodev->func[1]);
                        if (bus->ctrl_frame_stat) {
                                bus->ctrl_frame_err = -ENODEV;
                                wmb();
                                bus->ctrl_frame_stat = false;
                                brcmf_sdio_wait_event_wakeup(bus);
                        }
                        sdio_release_host(bus->sdiodev->func[1]);
                }
        } else if (atomic_read(&bus->intstatus) ||
                   atomic_read(&bus->ipend) > 0 ||
                   (!atomic_read(&bus->fcstate) &&
                    brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) &&
                    data_ok(bus))) {
                bus->dpc_triggered = true;
        }
}

static struct pktq *brcmf_sdio_bus_gettxq(struct device *dev)
{
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
        struct brcmf_sdio *bus = sdiodev->bus;

        return &bus->txq;
}

static bool brcmf_sdio_prec_enq(struct pktq *q, struct sk_buff *pkt, int prec)
{
        struct sk_buff *p;
        int eprec = -1;         /* precedence to evict from */

        /* Fast case, precedence queue is not full and we are also not
         * exceeding total queue length
         */
        if (!pktq_pfull(q, prec) && !pktq_full(q)) {
                brcmu_pktq_penq(q, prec, pkt);
                return true;
        }

        /* Determine precedence from which to evict packet, if any */
        if (pktq_pfull(q, prec)) {
                eprec = prec;
        } else if (pktq_full(q)) {
                p = brcmu_pktq_peek_tail(q, &eprec);
                if (eprec > prec)
                        return false;
        }

        /* Evict if needed */
        if (eprec >= 0) {
                /* Detect queueing to unconfigured precedence */
                if (eprec == prec)
                        return false;   /* refuse newer (incoming) packet */
                /* Evict packet according to discard policy */
                p = brcmu_pktq_pdeq_tail(q, eprec);
                if (p == NULL)
                        brcmf_err("brcmu_pktq_pdeq_tail() failed\n");
                brcmu_pkt_buf_free_skb(p);
        }

        /* Enqueue */
        p = brcmu_pktq_penq(q, prec, pkt);
        if (p == NULL)
                brcmf_err("brcmu_pktq_penq() failed\n");

        return p != NULL;
}

static int brcmf_sdio_bus_txdata(struct device *dev, struct sk_buff *pkt)
{
        int ret = -EBADE;
        uint prec;
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
        struct brcmf_sdio *bus = sdiodev->bus;

        brcmf_dbg(TRACE, "Enter: pkt: data %p len %d\n", pkt->data, pkt->len);
        if (sdiodev->state != BRCMF_SDIOD_DATA)
                return -EIO;

        /* Add space for the header */
        skb_push(pkt, bus->tx_hdrlen);
        /* precondition: IS_ALIGNED((unsigned long)(pkt->data), 2) */

        prec = prio2prec((pkt->priority & PRIOMASK));

        /* Check for existing queue, current flow-control,
                         pending event, or pending clock */
        brcmf_dbg(TRACE, "deferring pktq len %d\n", pktq_len(&bus->txq));
        bus->sdcnt.fcqueued++;

        /* Priority based enq */
        spin_lock_bh(&bus->txq_lock);
        /* reset bus_flags in packet cb */
        *(u16 *)(pkt->cb) = 0;
        if (!brcmf_sdio_prec_enq(&bus->txq, pkt, prec)) {
                skb_pull(pkt, bus->tx_hdrlen);
                brcmf_err("out of bus->txq !!!\n");
                ret = -ENOSR;
        } else {
                ret = 0;
        }

        if (pktq_len(&bus->txq) >= TXHI) {
                bus->txoff = true;
                brcmf_txflowblock(dev, true);
        }
        spin_unlock_bh(&bus->txq_lock);

#ifdef DEBUG
        if (pktq_plen(&bus->txq, prec) > qcount[prec])
                qcount[prec] = pktq_plen(&bus->txq, prec);
#endif

        brcmf_sdio_trigger_dpc(bus);
        return ret;
}

#ifdef DEBUG
#define CONSOLE_LINE_MAX        192

static int brcmf_sdio_readconsole(struct brcmf_sdio *bus)
{
        struct brcmf_console *c = &bus->console;
        u8 line[CONSOLE_LINE_MAX], ch;
        u32 n, idx, addr;
        int rv;

        /* Don't do anything until FWREADY updates console address */
        if (bus->console_addr == 0)
                return 0;

        /* Read console log struct */
        addr = bus->console_addr + offsetof(struct rte_console, log_le);
        rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr, (u8 *)&c->log_le,
                               sizeof(c->log_le));
        if (rv < 0)
                return rv;

        /* Allocate console buffer (one time only) */
        if (c->buf == NULL) {
                c->bufsize = le32_to_cpu(c->log_le.buf_size);
                c->buf = kmalloc(c->bufsize, GFP_ATOMIC);
                if (c->buf == NULL)
                        return -ENOMEM;
        }

        idx = le32_to_cpu(c->log_le.idx);

        /* Protect against corrupt value */
        if (idx > c->bufsize)
                return -EBADE;

        /* Skip reading the console buffer if the index pointer
         has not moved */
        if (idx == c->last)
                return 0;

        /* Read the console buffer */
        addr = le32_to_cpu(c->log_le.buf);
        rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr, c->buf, c->bufsize);
        if (rv < 0)
                return rv;

        while (c->last != idx) {
                for (n = 0; n < CONSOLE_LINE_MAX - 2; n++) {
                        if (c->last == idx) {
                                /* This would output a partial line.
                                 * Instead, back up
                                 * the buffer pointer and output this
                                 * line next time around.
                                 */
                                if (c->last >= n)
                                        c->last -= n;
                                else
                                        c->last = c->bufsize - n;
                                goto break2;
                        }
                        ch = c->buf[c->last];
                        c->last = (c->last + 1) % c->bufsize;
                        if (ch == '\n')
                                break;
                        line[n] = ch;
                }

                if (n > 0) {
                        if (line[n - 1] == '\r')
                                n--;
                        line[n] = 0;
                        pr_debug("CONSOLE: %s\n", line);
                }
        }
break2:

        return 0;
}
#endif                          /* DEBUG */

static int
brcmf_sdio_bus_txctl(struct device *dev, unsigned char *msg, uint msglen)
{
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
        struct brcmf_sdio *bus = sdiodev->bus;
        int ret;

        brcmf_dbg(TRACE, "Enter\n");
        if (sdiodev->state != BRCMF_SDIOD_DATA)
                return -EIO;

        /* Send from dpc */
        bus->ctrl_frame_buf = msg;
        bus->ctrl_frame_len = msglen;
        wmb();
        bus->ctrl_frame_stat = true;

        brcmf_sdio_trigger_dpc(bus);
        wait_event_interruptible_timeout(bus->ctrl_wait, !bus->ctrl_frame_stat,
                                         CTL_DONE_TIMEOUT);
        ret = 0;
        if (bus->ctrl_frame_stat) {
                sdio_claim_host(bus->sdiodev->func[1]);
                if (bus->ctrl_frame_stat) {
                        brcmf_dbg(SDIO, "ctrl_frame timeout\n");
                        bus->ctrl_frame_stat = false;
                        ret = -ETIMEDOUT;
                }
                sdio_release_host(bus->sdiodev->func[1]);
        }
        if (!ret) {
                brcmf_dbg(SDIO, "ctrl_frame complete, err=%d\n",
                          bus->ctrl_frame_err);
                rmb();
                ret = bus->ctrl_frame_err;
        }

        if (ret)
                bus->sdcnt.tx_ctlerrs++;
        else
                bus->sdcnt.tx_ctlpkts++;

        return ret;
}

#ifdef DEBUG
static int brcmf_sdio_dump_console(struct seq_file *seq, struct brcmf_sdio *bus,
                                   struct sdpcm_shared *sh)
{
        u32 addr, console_ptr, console_size, console_index;
        char *conbuf = NULL;
        __le32 sh_val;
        int rv;

        /* obtain console information from device memory */
        addr = sh->console_addr + offsetof(struct rte_console, log_le);
        rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr,
                               (u8 *)&sh_val, sizeof(u32));
        if (rv < 0)
                return rv;
        console_ptr = le32_to_cpu(sh_val);

        addr = sh->console_addr + offsetof(struct rte_console, log_le.buf_size);
        rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr,
                               (u8 *)&sh_val, sizeof(u32));
        if (rv < 0)
                return rv;
        console_size = le32_to_cpu(sh_val);

        addr = sh->console_addr + offsetof(struct rte_console, log_le.idx);
        rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr,
                               (u8 *)&sh_val, sizeof(u32));
        if (rv < 0)
                return rv;
        console_index = le32_to_cpu(sh_val);

        /* allocate buffer for console data */
        if (console_size <= CONSOLE_BUFFER_MAX)
                conbuf = vzalloc(console_size+1);

        if (!conbuf)
                return -ENOMEM;

        /* obtain the console data from device */
        conbuf[console_size] = '\0';
        rv = brcmf_sdiod_ramrw(bus->sdiodev, false, console_ptr, (u8 *)conbuf,
                               console_size);
        if (rv < 0)
                goto done;

        rv = seq_write(seq, conbuf + console_index,
                       console_size - console_index);
        if (rv < 0)
                goto done;

        if (console_index > 0)
                rv = seq_write(seq, conbuf, console_index - 1);

done:
        vfree(conbuf);
        return rv;
}

static int brcmf_sdio_trap_info(struct seq_file *seq, struct brcmf_sdio *bus,
                                struct sdpcm_shared *sh)
{
        int error;
        struct brcmf_trap_info tr;

        if ((sh->flags & SDPCM_SHARED_TRAP) == 0) {
                brcmf_dbg(INFO, "no trap in firmware\n");
                return 0;
        }

        error = brcmf_sdiod_ramrw(bus->sdiodev, false, sh->trap_addr, (u8 *)&tr,
                                  sizeof(struct brcmf_trap_info));
        if (error < 0)
                return error;

        seq_printf(seq,
                   "dongle trap info: type 0x%x @ epc 0x%08x\n"
                   "  cpsr 0x%08x spsr 0x%08x sp 0x%08x\n"
                   "  lr   0x%08x pc   0x%08x offset 0x%x\n"
                   "  r0   0x%08x r1   0x%08x r2 0x%08x r3 0x%08x\n"
                   "  r4   0x%08x r5   0x%08x r6 0x%08x r7 0x%08x\n",
                   le32_to_cpu(tr.type), le32_to_cpu(tr.epc),
                   le32_to_cpu(tr.cpsr), le32_to_cpu(tr.spsr),
                   le32_to_cpu(tr.r13), le32_to_cpu(tr.r14),
                   le32_to_cpu(tr.pc), sh->trap_addr,
                   le32_to_cpu(tr.r0), le32_to_cpu(tr.r1),
                   le32_to_cpu(tr.r2), le32_to_cpu(tr.r3),
                   le32_to_cpu(tr.r4), le32_to_cpu(tr.r5),
                   le32_to_cpu(tr.r6), le32_to_cpu(tr.r7));

        return 0;
}

static int brcmf_sdio_assert_info(struct seq_file *seq, struct brcmf_sdio *bus,
                                  struct sdpcm_shared *sh)
{
        int error = 0;
        char file[80] = "?";
        char expr[80] = "<???>";

        if ((sh->flags & SDPCM_SHARED_ASSERT_BUILT) == 0) {
                brcmf_dbg(INFO, "firmware not built with -assert\n");
                return 0;
        } else if ((sh->flags & SDPCM_SHARED_ASSERT) == 0) {
                brcmf_dbg(INFO, "no assert in dongle\n");
                return 0;
        }