/*
 * Copyright (C) Freescale Semiconductor, Inc. 2006. All rights reserved.
 * Author: Jason Jin<Jason.jin@freescale.com>
 *         Zhang Wei<wei.zhang@freescale.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 * with the reference on libata and ahci drvier in kernel
 *
 */
#include <common.h>

#include <command.h>
#include <pci.h>
#include <asm/processor.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <malloc.h>
#include <scsi.h>
#include <ata.h>
#include <linux/ctype.h>
#include <ahci.h>

struct ahci_probe_ent *probe_ent = NULL;
hd_driveid_t *ataid[AHCI_MAX_PORTS];

#define writel_with_flush(a,b)  do { writel(a,b); readl(b); } while (0)


static inline u32 ahci_port_base(u32 base, u32 port)
{
        return base + 0x100 + (port * 0x80);
}


static void ahci_setup_port(struct ahci_ioports *port, unsigned long base,
                            unsigned int port_idx)
{
        base = ahci_port_base(base, port_idx);

        port->cmd_addr = base;
        port->scr_addr = base + PORT_SCR;
}


#define msleep(a) udelay(a * 1000)
#define ssleep(a) msleep(a * 1000)

static int waiting_for_cmd_completed(volatile u8 *offset,
                                     int timeout_msec,
                                     u32 sign)
{
        int i;
        u32 status;

        for (i = 0; ((status = readl(offset)) & sign) && i < timeout_msec; i++)
                msleep(1);

        return (i < timeout_msec) ? 0 : -1;
}


static int ahci_host_init(struct ahci_probe_ent *probe_ent)
{
        pci_dev_t pdev = probe_ent->dev;
        volatile u8 *mmio = (volatile u8 *)probe_ent->mmio_base;
        u32 tmp, cap_save;
        u16 tmp16;
        int i, j;
        volatile u8 *port_mmio;
        unsigned short vendor;

        cap_save = readl(mmio + HOST_CAP);
        cap_save &= ((1 << 28) | (1 << 17));
        cap_save |= (1 << 27);

        /* global controller reset */
        tmp = readl(mmio + HOST_CTL);
        if ((tmp & HOST_RESET) == 0)
                writel_with_flush(tmp | HOST_RESET, mmio + HOST_CTL);

        /* reset must complete within 1 second, or
         * the hardware should be considered fried.
         */
        ssleep(1);

        tmp = readl(mmio + HOST_CTL);
        if (tmp & HOST_RESET) {
                debug("controller reset failed (0x%x)\n", tmp);
                return -1;
        }

        writel_with_flush(HOST_AHCI_EN, mmio + HOST_CTL);
        writel(cap_save, mmio + HOST_CAP);
        writel_with_flush(0xf, mmio + HOST_PORTS_IMPL);

        pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor);

        if (vendor == PCI_VENDOR_ID_INTEL) {
                u16 tmp16;
                pci_read_config_word(pdev, 0x92, &tmp16);
                tmp16 |= 0xf;
                pci_write_config_word(pdev, 0x92, tmp16);
        }

        probe_ent->cap = readl(mmio + HOST_CAP);
        probe_ent->port_map = readl(mmio + HOST_PORTS_IMPL);
        probe_ent->n_ports = (probe_ent->cap & 0x1f) + 1;

        debug("cap 0x%x  port_map 0x%x  n_ports %d\n",
              probe_ent->cap, probe_ent->port_map, probe_ent->n_ports);

        for (i = 0; i < probe_ent->n_ports; i++) {
                probe_ent->port[i].port_mmio = ahci_port_base((u32) mmio, i);
                port_mmio = (u8 *) probe_ent->port[i].port_mmio;
                ahci_setup_port(&probe_ent->port[i], (unsigned long)mmio, i);

                /* make sure port is not active */
                tmp = readl(port_mmio + PORT_CMD);
                if (tmp & (PORT_CMD_LIST_ON | PORT_CMD_FIS_ON |
                           PORT_CMD_FIS_RX | PORT_CMD_START)) {
                        tmp &= ~(PORT_CMD_LIST_ON | PORT_CMD_FIS_ON |
                                 PORT_CMD_FIS_RX | PORT_CMD_START);
                        writel_with_flush(tmp, port_mmio + PORT_CMD);

                        /* spec says 500 msecs for each bit, so
                         * this is slightly incorrect.
                         */
                        msleep(500);
                }

                writel(PORT_CMD_SPIN_UP, port_mmio + PORT_CMD);

                j = 0;
                while (j < 100) {
                        msleep(10);
                        tmp = readl(port_mmio + PORT_SCR_STAT);
                        if ((tmp & 0xf) == 0x3)
                                break;
                        j++;
                }

                tmp = readl(port_mmio + PORT_SCR_ERR);
                debug("PORT_SCR_ERR 0x%x\n", tmp);
                writel(tmp, port_mmio + PORT_SCR_ERR);

                /* ack any pending irq events for this port */
                tmp = readl(port_mmio + PORT_IRQ_STAT);
                debug("PORT_IRQ_STAT 0x%x\n", tmp);
                if (tmp)
                        writel(tmp, port_mmio + PORT_IRQ_STAT);

                writel(1 << i, mmio + HOST_IRQ_STAT);

                /* set irq mask (enables interrupts) */
                writel(DEF_PORT_IRQ, port_mmio + PORT_IRQ_MASK);

                /*register linkup ports */
                tmp = readl(port_mmio + PORT_SCR_STAT);
                debug("Port %d status: 0x%x\n", i, tmp);
                if ((tmp & 0xf) == 0x03)
                        probe_ent->link_port_map |= (0x01 << i);
        }

        tmp = readl(mmio + HOST_CTL);
        debug("HOST_CTL 0x%x\n", tmp);
        writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
        tmp = readl(mmio + HOST_CTL);
        debug("HOST_CTL 0x%x\n", tmp);

        pci_read_config_word(pdev, PCI_COMMAND, &tmp16);
        tmp |= PCI_COMMAND_MASTER;
        pci_write_config_word(pdev, PCI_COMMAND, tmp16);

        return 0;
}


static void ahci_print_info(struct ahci_probe_ent *probe_ent)
{
        pci_dev_t pdev = probe_ent->dev;
        volatile u8 *mmio = (volatile u8 *)probe_ent->mmio_base;
        u32 vers, cap, impl, speed;
        const char *speed_s;
        u16 cc;
        const char *scc_s;

        vers = readl(mmio + HOST_VERSION);
        cap = probe_ent->cap;
        impl = probe_ent->port_map;

        speed = (cap >> 20) & 0xf;
        if (speed == 1)
                speed_s = "1.5";
        else if (speed == 2)
                speed_s = "3";
        else
                speed_s = "?";

        pci_read_config_word(pdev, 0x0a, &cc);
        if (cc == 0x0101)
                scc_s = "IDE";
        else if (cc == 0x0106)
                scc_s = "SATA";
        else if (cc == 0x0104)
                scc_s = "RAID";
        else
                scc_s = "unknown";

        printf("AHCI %02x%02x.%02x%02x "
               "%u slots %u ports %s Gbps 0x%x impl %s mode\n",
               (vers >> 24) & 0xff,
               (vers >> 16) & 0xff,
               (vers >> 8) & 0xff,
               vers & 0xff,
               ((cap >> 8) & 0x1f) + 1, (cap & 0x1f) + 1, speed_s, impl, scc_s);

        printf("flags: "
               "%s%s%s%s%s%s"
               "%s%s%s%s%s%s%s\n",
               cap & (1 << 31) ? "64bit " : "",
               cap & (1 << 30) ? "ncq " : "",
               cap & (1 << 28) ? "ilck " : "",
               cap & (1 << 27) ? "stag " : "",
               cap & (1 << 26) ? "pm " : "",
               cap & (1 << 25) ? "led " : "",
               cap & (1 << 24) ? "clo " : "",
               cap & (1 << 19) ? "nz " : "",
               cap & (1 << 18) ? "only " : "",
               cap & (1 << 17) ? "pmp " : "",
               cap & (1 << 15) ? "pio " : "",
               cap & (1 << 14) ? "slum " : "",
               cap & (1 << 13) ? "part " : "");
}

static int ahci_init_one(pci_dev_t pdev)
{
        u16 vendor;
        int rc;

        memset((void *)ataid, 0, sizeof(hd_driveid_t *) * AHCI_MAX_PORTS);

        probe_ent = malloc(sizeof(struct ahci_probe_ent));
        memset(probe_ent, 0, sizeof(struct ahci_probe_ent));
        probe_ent->dev = pdev;

        probe_ent->host_flags = ATA_FLAG_SATA
                                | ATA_FLAG_NO_LEGACY
                                | ATA_FLAG_MMIO
                                | ATA_FLAG_PIO_DMA
                                | ATA_FLAG_NO_ATAPI;
        probe_ent->pio_mask = 0x1f;
        probe_ent->udma_mask = 0x7f;    /*Fixme,assume to support UDMA6 */

        probe_ent->mmio_base = (u32)pci_map_bar(pdev, AHCI_PCI_BAR,
                                                PCI_REGION_MEM);

        /* Take from kernel:
         * JMicron-specific fixup:
         * make sure we're in AHCI mode
         */
        pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor);
        if (vendor == 0x197b)
                pci_write_config_byte(pdev, 0x41, 0xa1);

        /* initialize adapter */
        rc = ahci_host_init(probe_ent);
        if (rc)
                goto err_out;

        ahci_print_info(probe_ent);

        return 0;

      err_out:
        return rc;
}


#define MAX_DATA_BYTE_COUNT  (4*1024*1024)

static int ahci_fill_sg(u8 port, unsigned char *buf, int buf_len)
{
        struct ahci_ioports *pp = &(probe_ent->port[port]);
        struct ahci_sg *ahci_sg = pp->cmd_tbl_sg;
        u32 sg_count;
        int i;

        sg_count = ((buf_len - 1) / MAX_DATA_BYTE_COUNT) + 1;
        if (sg_count > AHCI_MAX_SG) {
                printf("Error:Too much sg!\n");
                return -1;
        }

        for (i = 0; i < sg_count; i++) {
                ahci_sg->addr =
                    cpu_to_le32((u32) buf + i * MAX_DATA_BYTE_COUNT);
                ahci_sg->addr_hi = 0;
                ahci_sg->flags_size = cpu_to_le32(0x3fffff &
                                          (buf_len < MAX_DATA_BYTE_COUNT
                                           ? (buf_len - 1)
                                           : (MAX_DATA_BYTE_COUNT - 1)));
                ahci_sg++;
                buf_len -= MAX_DATA_BYTE_COUNT;
        }

        return sg_count;
}


static void ahci_fill_cmd_slot(struct ahci_ioports *pp, u32 opts)
{
        pp->cmd_slot->opts = cpu_to_le32(opts);
        pp->cmd_slot->status = 0;
        pp->cmd_slot->tbl_addr = cpu_to_le32(pp->cmd_tbl & 0xffffffff);
        pp->cmd_slot->tbl_addr_hi = 0;
}


static void ahci_set_feature(u8 port)
{
        struct ahci_ioports *pp = &(probe_ent->port[port]);
        volatile u8 *port_mmio = (volatile u8 *)pp->port_mmio;
        u32 cmd_fis_len = 5;    /* five dwords */
        u8 fis[20];

        /*set feature */
        memset(fis, 0, 20);
        fis[0] = 0x27;
        fis[1] = 1 << 7;
        fis[2] = ATA_CMD_SETF;
        fis[3] = SETFEATURES_XFER;
        fis[12] = __ilog2(probe_ent->udma_mask + 1) + 0x40 - 0x01;

        memcpy((unsigned char *)pp->cmd_tbl, fis, 20);
        ahci_fill_cmd_slot(pp, cmd_fis_len);
        writel(1, port_mmio + PORT_CMD_ISSUE);
        readl(port_mmio + PORT_CMD_ISSUE);

        if (waiting_for_cmd_completed(port_mmio + PORT_CMD_ISSUE, 150, 0x1)) {
                printf("set feature error!\n");
        }
}


static int ahci_port_start(u8 port)
{
        struct ahci_ioports *pp = &(probe_ent->port[port]);
        volatile u8 *port_mmio = (volatile u8 *)pp->port_mmio;
        u32 port_status;
        u32 mem;

        debug("Enter start port: %d\n", port);
        port_status = readl(port_mmio + PORT_SCR_STAT);
        debug("Port %d status: %x\n", port, port_status);
        if ((port_status & 0xf) != 0x03) {
                printf("No Link on this port!\n");
                return -1;
        }

        mem = (u32) malloc(AHCI_PORT_PRIV_DMA_SZ + 2048);
        if (!mem) {
                free(pp);
                printf("No mem for table!\n");
                return -ENOMEM;
        }

        mem = (mem + 0x800) & (~0x7ff); /* Aligned to 2048-bytes */
        memset((u8 *) mem, 0, AHCI_PORT_PRIV_DMA_SZ);

        /*
         * First item in chunk of DMA memory: 32-slot command table,
         * 32 bytes each in size
         */
        pp->cmd_slot = (struct ahci_cmd_hdr *)mem;
        debug("cmd_slot = 0x%x\n", pp->cmd_slot);
        mem += (AHCI_CMD_SLOT_SZ + 224);

        /*
         * Second item: Received-FIS area
         */
        pp->rx_fis = mem;
        mem += AHCI_RX_FIS_SZ;

        /*
         * Third item: data area for storing a single command
         * and its scatter-gather table
         */
        pp->cmd_tbl = mem;
        debug("cmd_tbl_dma = 0x%x\n", pp->cmd_tbl);

        mem += AHCI_CMD_TBL_HDR;
        pp->cmd_tbl_sg = (struct ahci_sg *)mem;

        writel_with_flush((u32) pp->cmd_slot, port_mmio + PORT_LST_ADDR);

        writel_with_flush(pp->rx_fis, port_mmio + PORT_FIS_ADDR);

        writel_with_flush(PORT_CMD_ICC_ACTIVE | PORT_CMD_FIS_RX |
                          PORT_CMD_POWER_ON | PORT_CMD_SPIN_UP |
                          PORT_CMD_START, port_mmio + PORT_CMD);

        debug("Exit start port %d\n", port);

        return 0;
}


static int get_ahci_device_data(u8 port, u8 *fis, int fis_len, u8 *buf,
                                int buf_len)
{

        struct ahci_ioports *pp = &(probe_ent->port[port]);
        volatile u8 *port_mmio = (volatile u8 *)pp->port_mmio;
        u32 opts;
        u32 port_status;
        int sg_count;

        debug("Enter get_ahci_device_data: for port %d\n", port);

        if (port > probe_ent->n_ports) {
                printf("Invaild port number %d\n", port);
                return -1;
        }

        port_status = readl(port_mmio + PORT_SCR_STAT);
        if ((port_status & 0xf) != 0x03) {
                debug("No Link on port %d!\n", port);
                return -1;
        }

        memcpy((unsigned char *)pp->cmd_tbl, fis, fis_len);

        sg_count = ahci_fill_sg(port, buf, buf_len);
        opts = (fis_len >> 2) | (sg_count << 16);
        ahci_fill_cmd_slot(pp, opts);

        writel_with_flush(1, port_mmio + PORT_CMD_ISSUE);

        if (waiting_for_cmd_completed(port_mmio + PORT_CMD_ISSUE, 150, 0x1)) {
                printf("timeout exit!\n");
                return -1;
        }
        debug("get_ahci_device_data: %d byte transferred.\n",
              pp->cmd_slot->status);

        return 0;
}


static char *ata_id_strcpy(u16 *target, u16 *src, int len)
{
        int i;
        for (i = 0; i < len / 2; i++)
                target[i] = le16_to_cpu(src[i]);
        return (char *)target;
}


static void dump_ataid(hd_driveid_t *ataid)
{
        debug("(49)ataid->capability = 0x%x\n", ataid->capability);
        debug("(53)ataid->field_valid =0x%x\n", ataid->field_valid);
        debug("(63)ataid->dma_mword = 0x%x\n", ataid->dma_mword);
        debug("(64)ataid->eide_pio_modes = 0x%x\n", ataid->eide_pio_modes);
        debug("(75)ataid->queue_depth = 0x%x\n", ataid->queue_depth);
        debug("(80)ataid->major_rev_num = 0x%x\n", ataid->major_rev_num);
        debug("(81)ataid->minor_rev_num = 0x%x\n", ataid->minor_rev_num);
        debug("(82)ataid->command_set_1 = 0x%x\n", ataid->command_set_1);
        debug("(83)ataid->command_set_2 = 0x%x\n", ataid->command_set_2);
        debug("(84)ataid->cfsse = 0x%x\n", ataid->cfsse);
        debug("(85)ataid->cfs_enable_1 = 0x%x\n", ataid->cfs_enable_1);
        debug("(86)ataid->cfs_enable_2 = 0x%x\n", ataid->cfs_enable_2);
        debug("(87)ataid->csf_default = 0x%x\n", ataid->csf_default);
        debug("(88)ataid->dma_ultra = 0x%x\n", ataid->dma_ultra);
        debug("(93)ataid->hw_config = 0x%x\n", ataid->hw_config);
}


/*
 * SCSI INQUIRY command operation.
 */
static int ata_scsiop_inquiry(ccb *pccb)
{
        u8 hdr[] = {
                0,
                0,
                0x5,            /* claim SPC-3 version compatibility */
                2,
                95 - 4,
        };
        u8 fis[20];
        u8 *tmpid;
        u8 port;

        /* Clean ccb data buffer */
        memset(pccb->pdata, 0, pccb->datalen);

        memcpy(pccb->pdata, hdr, sizeof(hdr));

        if (pccb->datalen <= 35)
                return 0;

        memset(fis, 0, 20);
        /* Construct the FIS */
        fis[0] = 0x27;          /* Host to device FIS. */
        fis[1] = 1 << 7;        /* Command FIS. */
        fis[2] = ATA_CMD_IDENT; /* Command byte. */

        /* Read id from sata */
        port = pccb->target;
        if (!(tmpid = malloc(sizeof(hd_driveid_t))))
                return -ENOMEM;

        if (get_ahci_device_data(port, (u8 *) & fis, 20,
                                 tmpid, sizeof(hd_driveid_t))) {
                debug("scsi_ahci: SCSI inquiry command failure.\n");
                return -EIO;
        }

        if (ataid[port])
                free(ataid[port]);
        ataid[port] = (hd_driveid_t *) tmpid;

        memcpy(&pccb->pdata[8], "ATA     ", 8);
        ata_id_strcpy((u16 *) &pccb->pdata[16], (u16 *)ataid[port]->model, 16);
        ata_id_strcpy((u16 *) &pccb->pdata[32], (u16 *)ataid[port]->fw_rev, 4);

        dump_ataid(ataid[port]);
        return 0;
}


/*
 * SCSI READ10 command operation.
 */
static int ata_scsiop_read10(ccb * pccb)
{
        u64 lba = 0;
        u32 len = 0;
        u8 fis[20];

        lba = (((u64) pccb->cmd[2]) << 24) | (((u64) pccb->cmd[3]) << 16)
            | (((u64) pccb->cmd[4]) << 8) | ((u64) pccb->cmd[5]);
        len = (((u32) pccb->cmd[7]) << 8) | ((u32) pccb->cmd[8]);

        /* For 10-byte and 16-byte SCSI R/W commands, transfer
         * length 0 means transfer 0 block of data.
         * However, for ATA R/W commands, sector count 0 means
         * 256 or 65536 sectors, not 0 sectors as in SCSI.
         *
         * WARNING: one or two older ATA drives treat 0 as 0...
         */
        if (!len)
                return 0;
        memset(fis, 0, 20);

        /* Construct the FIS */
        fis[0] = 0x27;          /* Host to device FIS. */
        fis[1] = 1 << 7;        /* Command FIS. */
        fis[2] = ATA_CMD_RD_DMA;        /* Command byte. */

        /* LBA address, only support LBA28 in this driver */
        fis[4] = pccb->cmd[5];
        fis[5] = pccb->cmd[4];
        fis[6] = pccb->cmd[3];
        fis[7] = (pccb->cmd[2] & 0x0f) | 0xe0;

        /* Sector Count */
        fis[12] = pccb->cmd[8];
        fis[13] = pccb->cmd[7];

        /* Read from ahci */
        if (get_ahci_device_data(pccb->target, (u8 *) & fis, 20,
                                 pccb->pdata, pccb->datalen)) {
                debug("scsi_ahci: SCSI READ10 command failure.\n");
                return -EIO;
        }

        return 0;
}


/*
 * SCSI READ CAPACITY10 command operation.
 */
static int ata_scsiop_read_capacity10(ccb *pccb)
{
        u8 buf[8];

        if (!ataid[pccb->target]) {
                printf("scsi_ahci: SCSI READ CAPACITY10 command failure. "
                       "\tNo ATA info!\n"
                       "\tPlease run SCSI commmand INQUIRY firstly!\n");
                return -EPERM;
        }

        memset(buf, 0, 8);

        *(u32 *) buf = le32_to_cpu(ataid[pccb->target]->lba_capacity);

        buf[6] = 512 >> 8;
        buf[7] = 512 & 0xff;

        memcpy(pccb->pdata, buf, 8);

        return 0;
}


/*
 * SCSI TEST UNIT READY command operation.
 */
static int ata_scsiop_test_unit_ready(ccb *pccb)
{
        return (ataid[pccb->target]) ? 0 : -EPERM;
}


int scsi_exec(ccb *pccb)
{
        int ret;

        switch (pccb->cmd[0]) {
        case SCSI_READ10:
                ret = ata_scsiop_read10(pccb);
                break;
        case SCSI_RD_CAPAC:
                ret = ata_scsiop_read_capacity10(pccb);
                break;
        case SCSI_TST_U_RDY:
                ret = ata_scsiop_test_unit_ready(pccb);
                break;
        case SCSI_INQUIRY:
                ret = ata_scsiop_inquiry(pccb);
                break;
        default:
                printf("Unsupport SCSI command 0x%02x\n", pccb->cmd[0]);
                return FALSE;
        }

        if (ret) {
                debug("SCSI command 0x%02x ret errno %d\n", pccb->cmd[0], ret);
                return FALSE;
        }
        return TRUE;

}


void scsi_low_level_init(int busdevfunc)
{
        int i;
        u32 linkmap;

        ahci_init_one(busdevfunc);

        linkmap = probe_ent->link_port_map;

        for (i = 0; i < CONFIG_SYS_SCSI_MAX_SCSI_ID; i++) {
                if (((linkmap >> i) & 0x01)) {
                        if (ahci_port_start((u8) i)) {
                                printf("Can not start port %d\n", i);
                                continue;
                        }
                        ahci_set_feature((u8) i);
                }
        }
}


void scsi_bus_reset(void)
{
        /*Not implement*/
}


void scsi_print_error(ccb * pccb)
{
        /*The ahci error info can be read in the ahci driver*/
}