/*
 * Copyright (C) 2001 Troy D. Armstrong  IBM Corporation
 * Copyright (C) 2004-2005 Stephen Rothwell  IBM Corporation
 *
 * This modules exists as an interface between a Linux secondary partition
 * running on an iSeries and the primary partition's Virtual Service
 * Processor (VSP) object.  The VSP has final authority over powering on/off
 * all partitions in the iSeries.  It also provides miscellaneous low-level
 * machine facility type operations.
 *
 *
 * 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
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/dma-mapping.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/slab.h>

#include <asm/time.h>
#include <asm/uaccess.h>
#include <asm/paca.h>
#include <asm/abs_addr.h>
#include <asm/firmware.h>
#include <asm/iseries/mf.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/it_lp_queue.h>

#include "setup.h"

static int mf_initialized;

/*
 * This is the structure layout for the Machine Facilites LPAR event
 * flows.
 */
struct vsp_cmd_data {
        u64 token;
        u16 cmd;
        HvLpIndex lp_index;
        u8 result_code;
        u32 reserved;
        union {
                u64 state;      /* GetStateOut */
                u64 ipl_type;   /* GetIplTypeOut, Function02SelectIplTypeIn */
                u64 ipl_mode;   /* GetIplModeOut, Function02SelectIplModeIn */
                u64 page[4];    /* GetSrcHistoryIn */
                u64 flag;       /* GetAutoIplWhenPrimaryIplsOut,
                                   SetAutoIplWhenPrimaryIplsIn,
                                   WhiteButtonPowerOffIn,
                                   Function08FastPowerOffIn,
                                   IsSpcnRackPowerIncompleteOut */
                struct {
                        u64 token;
                        u64 address_type;
                        u64 side;
                        u32 length;
                        u32 offset;
                } kern;         /* SetKernelImageIn, GetKernelImageIn,
                                   SetKernelCmdLineIn, GetKernelCmdLineIn */
                u32 length_out; /* GetKernelImageOut, GetKernelCmdLineOut */
                u8 reserved[80];
        } sub_data;
};

struct vsp_rsp_data {
        struct completion com;
        struct vsp_cmd_data *response;
};

struct alloc_data {
        u16 size;
        u16 type;
        u32 count;
        u16 reserved1;
        u8 reserved2;
        HvLpIndex target_lp;
};

struct ce_msg_data;

typedef void (*ce_msg_comp_hdlr)(void *token, struct ce_msg_data *vsp_cmd_rsp);

struct ce_msg_comp_data {
        ce_msg_comp_hdlr handler;
        void *token;
};

struct ce_msg_data {
        u8 ce_msg[12];
        char reserved[4];
        struct ce_msg_comp_data *completion;
};

struct io_mf_lp_event {
        struct HvLpEvent hp_lp_event;
        u16 subtype_result_code;
        u16 reserved1;
        u32 reserved2;
        union {
                struct alloc_data alloc;
                struct ce_msg_data ce_msg;
                struct vsp_cmd_data vsp_cmd;
        } data;
};

#define subtype_data(a, b, c, d)        \
                (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))

/*
 * All outgoing event traffic is kept on a FIFO queue.  The first
 * pointer points to the one that is outstanding, and all new
 * requests get stuck on the end.  Also, we keep a certain number of
 * preallocated pending events so that we can operate very early in
 * the boot up sequence (before kmalloc is ready).
 */
struct pending_event {
        struct pending_event *next;
        struct io_mf_lp_event event;
        MFCompleteHandler hdlr;
        char dma_data[72];
        unsigned dma_data_length;
        unsigned remote_address;
};
static spinlock_t pending_event_spinlock;
static struct pending_event *pending_event_head;
static struct pending_event *pending_event_tail;
static struct pending_event *pending_event_avail;
#define PENDING_EVENT_PREALLOC_LEN 16
static struct pending_event pending_event_prealloc[PENDING_EVENT_PREALLOC_LEN];

/*
 * Put a pending event onto the available queue, so it can get reused.
 * Attention! You must have the pending_event_spinlock before calling!
 */
static void free_pending_event(struct pending_event *ev)
{
        if (ev != NULL) {
                ev->next = pending_event_avail;
                pending_event_avail = ev;
        }
}

/*
 * Enqueue the outbound event onto the stack.  If the queue was
 * empty to begin with, we must also issue it via the Hypervisor
 * interface.  There is a section of code below that will touch
 * the first stack pointer without the protection of the pending_event_spinlock.
 * This is OK, because we know that nobody else will be modifying
 * the first pointer when we do this.
 */
static int signal_event(struct pending_event *ev)
{
        int rc = 0;
        unsigned long flags;
        int go = 1;
        struct pending_event *ev1;
        HvLpEvent_Rc hv_rc;

        /* enqueue the event */
        if (ev != NULL) {
                ev->next = NULL;
                spin_lock_irqsave(&pending_event_spinlock, flags);
                if (pending_event_head == NULL)
                        pending_event_head = ev;
                else {
                        go = 0;
                        pending_event_tail->next = ev;
                }
                pending_event_tail = ev;
                spin_unlock_irqrestore(&pending_event_spinlock, flags);
        }

        /* send the event */
        while (go) {
                go = 0;

                /* any DMA data to send beforehand? */
                if (pending_event_head->dma_data_length > 0)
                        HvCallEvent_dmaToSp(pending_event_head->dma_data,
                                        pending_event_head->remote_address,
                                        pending_event_head->dma_data_length,
                                        HvLpDma_Direction_LocalToRemote);

                hv_rc = HvCallEvent_signalLpEvent(
                                &pending_event_head->event.hp_lp_event);
                if (hv_rc != HvLpEvent_Rc_Good) {
                        printk(KERN_ERR "mf.c: HvCallEvent_signalLpEvent() "
                                        "failed with %d\n", (int)hv_rc);

                        spin_lock_irqsave(&pending_event_spinlock, flags);
                        ev1 = pending_event_head;
                        pending_event_head = pending_event_head->next;
                        if (pending_event_head != NULL)
                                go = 1;
                        spin_unlock_irqrestore(&pending_event_spinlock, flags);

                        if (ev1 == ev)
                                rc = -EIO;
                        else if (ev1->hdlr != NULL)
                                (*ev1->hdlr)((void *)ev1->event.hp_lp_event.xCorrelationToken, -EIO);

                        spin_lock_irqsave(&pending_event_spinlock, flags);
                        free_pending_event(ev1);
                        spin_unlock_irqrestore(&pending_event_spinlock, flags);
                }
        }

        return rc;
}

/*
 * Allocate a new pending_event structure, and initialize it.
 */
static struct pending_event *new_pending_event(void)
{
        struct pending_event *ev = NULL;
        HvLpIndex primary_lp = HvLpConfig_getPrimaryLpIndex();
        unsigned long flags;
        struct HvLpEvent *hev;

        spin_lock_irqsave(&pending_event_spinlock, flags);
        if (pending_event_avail != NULL) {
                ev = pending_event_avail;
                pending_event_avail = pending_event_avail->next;
        }
        spin_unlock_irqrestore(&pending_event_spinlock, flags);
        if (ev == NULL) {
                ev = kmalloc(sizeof(struct pending_event), GFP_ATOMIC);
                if (ev == NULL) {
                        printk(KERN_ERR "mf.c: unable to kmalloc %ld bytes\n",
                                        sizeof(struct pending_event));
                        return NULL;
                }
        }
        memset(ev, 0, sizeof(struct pending_event));
        hev = &ev->event.hp_lp_event;
        hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK | HV_LP_EVENT_INT;
        hev->xType = HvLpEvent_Type_MachineFac;
        hev->xSourceLp = HvLpConfig_getLpIndex();
        hev->xTargetLp = primary_lp;
        hev->xSizeMinus1 = sizeof(ev->event) - 1;
        hev->xRc = HvLpEvent_Rc_Good;
        hev->xSourceInstanceId = HvCallEvent_getSourceLpInstanceId(primary_lp,
                        HvLpEvent_Type_MachineFac);
        hev->xTargetInstanceId = HvCallEvent_getTargetLpInstanceId(primary_lp,
                        HvLpEvent_Type_MachineFac);

        return ev;
}

static int __maybe_unused
signal_vsp_instruction(struct vsp_cmd_data *vsp_cmd)
{
        struct pending_event *ev = new_pending_event();
        int rc;
        struct vsp_rsp_data response;

        if (ev == NULL)
                return -ENOMEM;

        init_completion(&response.com);
        response.response = vsp_cmd;
        ev->event.hp_lp_event.xSubtype = 6;
        ev->event.hp_lp_event.x.xSubtypeData =
                subtype_data('M', 'F',  'V',  'I');
        ev->event.data.vsp_cmd.token = (u64)&response;
        ev->event.data.vsp_cmd.cmd = vsp_cmd->cmd;
        ev->event.data.vsp_cmd.lp_index = HvLpConfig_getLpIndex();
        ev->event.data.vsp_cmd.result_code = 0xFF;
        ev->event.data.vsp_cmd.reserved = 0;
        memcpy(&(ev->event.data.vsp_cmd.sub_data),
                        &(vsp_cmd->sub_data), sizeof(vsp_cmd->sub_data));
        mb();

        rc = signal_event(ev);
        if (rc == 0)
                wait_for_completion(&response.com);
        return rc;
}


/*
 * Send a 12-byte CE message to the primary partition VSP object
 */
static int signal_ce_msg(char *ce_msg, struct ce_msg_comp_data *completion)
{
        struct pending_event *ev = new_pending_event();

        if (ev == NULL)
                return -ENOMEM;

        ev->event.hp_lp_event.xSubtype = 0;
        ev->event.hp_lp_event.x.xSubtypeData =
                subtype_data('M',  'F',  'C',  'E');
        memcpy(ev->event.data.ce_msg.ce_msg, ce_msg, 12);
        ev->event.data.ce_msg.completion = completion;
        return signal_event(ev);
}

/*
 * Send a 12-byte CE message (with no data) to the primary partition VSP object
 */
static int signal_ce_msg_simple(u8 ce_op, struct ce_msg_comp_data *completion)
{
        u8 ce_msg[12];

        memset(ce_msg, 0, sizeof(ce_msg));
        ce_msg[3] = ce_op;
        return signal_ce_msg(ce_msg, completion);
}

/*
 * Send a 12-byte CE message and DMA data to the primary partition VSP object
 */
static int dma_and_signal_ce_msg(char *ce_msg,
                struct ce_msg_comp_data *completion, void *dma_data,
                unsigned dma_data_length, unsigned remote_address)
{
        struct pending_event *ev = new_pending_event();

        if (ev == NULL)
                return -ENOMEM;

        ev->event.hp_lp_event.xSubtype = 0;
        ev->event.hp_lp_event.x.xSubtypeData =
                subtype_data('M', 'F', 'C', 'E');
        memcpy(ev->event.data.ce_msg.ce_msg, ce_msg, 12);
        ev->event.data.ce_msg.completion = completion;
        memcpy(ev->dma_data, dma_data, dma_data_length);
        ev->dma_data_length = dma_data_length;
        ev->remote_address = remote_address;
        return signal_event(ev);
}

/*
 * Initiate a nice (hopefully) shutdown of Linux.  We simply are
 * going to try and send the init process a SIGINT signal.  If
 * this fails (why?), we'll simply force it off in a not-so-nice
 * manner.
 */
static int shutdown(void)
{
        int rc = kill_cad_pid(SIGINT, 1);

        if (rc) {
                printk(KERN_ALERT "mf.c: SIGINT to init failed (%d), "
                                "hard shutdown commencing\n", rc);
                mf_power_off();
        } else
                printk(KERN_INFO "mf.c: init has been successfully notified "
                                "to proceed with shutdown\n");
        return rc;
}

/*
 * The primary partition VSP object is sending us a new
 * event flow.  Handle it...
 */
static void handle_int(struct io_mf_lp_event *event)
{
        struct ce_msg_data *ce_msg_data;
        struct ce_msg_data *pce_msg_data;
        unsigned long flags;
        struct pending_event *pev;

        /* ack the interrupt */
        event->hp_lp_event.xRc = HvLpEvent_Rc_Good;
        HvCallEvent_ackLpEvent(&event->hp_lp_event);

        /* process interrupt */
        switch (event->hp_lp_event.xSubtype) {
        case 0: /* CE message */
                ce_msg_data = &event->data.ce_msg;
                switch (ce_msg_data->ce_msg[3]) {
                case 0x5B:      /* power control notification */
                        if ((ce_msg_data->ce_msg[5] & 0x20) != 0) {
                                printk(KERN_INFO "mf.c: Commencing partition shutdown\n");
                                if (shutdown() == 0)
                                        signal_ce_msg_simple(0xDB, NULL);
                        }
                        break;
                case 0xC0:      /* get time */
                        spin_lock_irqsave(&pending_event_spinlock, flags);
                        pev = pending_event_head;
                        if (pev != NULL)
                                pending_event_head = pending_event_head->next;
                        spin_unlock_irqrestore(&pending_event_spinlock, flags);
                        if (pev == NULL)
                                break;
                        pce_msg_data = &pev->event.data.ce_msg;
                        if (pce_msg_data->ce_msg[3] != 0x40)
                                break;
                        if (pce_msg_data->completion != NULL) {
                                ce_msg_comp_hdlr handler =
                                        pce_msg_data->completion->handler;
                                void *token = pce_msg_data->completion->token;

                                if (handler != NULL)
                                        (*handler)(token, ce_msg_data);
                        }
                        spin_lock_irqsave(&pending_event_spinlock, flags);
                        free_pending_event(pev);
                        spin_unlock_irqrestore(&pending_event_spinlock, flags);
                        /* send next waiting event */
                        if (pending_event_head != NULL)
                                signal_event(NULL);
                        break;
                }
                break;
        case 1: /* IT sys shutdown */
                printk(KERN_INFO "mf.c: Commencing system shutdown\n");
                shutdown();
                break;
        }
}

/*
 * The primary partition VSP object is acknowledging the receipt
 * of a flow we sent to them.  If there are other flows queued
 * up, we must send another one now...
 */
static void handle_ack(struct io_mf_lp_event *event)
{
        unsigned long flags;
        struct pending_event *two = NULL;
        unsigned long free_it = 0;
        struct ce_msg_data *ce_msg_data;
        struct ce_msg_data *pce_msg_data;
        struct vsp_rsp_data *rsp;

        /* handle current event */
        if (pending_event_head == NULL) {
                printk(KERN_ERR "mf.c: stack empty for receiving ack\n");
                return;
        }

        switch (event->hp_lp_event.xSubtype) {
        case 0:     /* CE msg */
                ce_msg_data = &event->data.ce_msg;
                if (ce_msg_data->ce_msg[3] != 0x40) {
                        free_it = 1;
                        break;
                }
                if (ce_msg_data->ce_msg[2] == 0)
                        break;
                free_it = 1;
                pce_msg_data = &pending_event_head->event.data.ce_msg;
                if (pce_msg_data->completion != NULL) {
                        ce_msg_comp_hdlr handler =
                                pce_msg_data->completion->handler;
                        void *token = pce_msg_data->completion->token;

                        if (handler != NULL)
                                (*handler)(token, ce_msg_data);
                }
                break;
        case 4: /* allocate */
        case 5: /* deallocate */
                if (pending_event_head->hdlr != NULL)
                        (*pending_event_head->hdlr)((void *)event->hp_lp_event.xCorrelationToken, event->data.alloc.count);
                free_it = 1;
                break;
        case 6:
                free_it = 1;
                rsp = (struct vsp_rsp_data *)event->data.vsp_cmd.token;
                if (rsp == NULL) {
                        printk(KERN_ERR "mf.c: no rsp\n");
                        break;
                }
                if (rsp->response != NULL)
                        memcpy(rsp->response, &event->data.vsp_cmd,
                                        sizeof(event->data.vsp_cmd));
                complete(&rsp->com);
                break;
        }

        /* remove from queue */
        spin_lock_irqsave(&pending_event_spinlock, flags);
        if ((pending_event_head != NULL) && (free_it == 1)) {
                struct pending_event *oldHead = pending_event_head;

                pending_event_head = pending_event_head->next;
                two = pending_event_head;
                free_pending_event(oldHead);
        }
        spin_unlock_irqrestore(&pending_event_spinlock, flags);

        /* send next waiting event */
        if (two != NULL)
                signal_event(NULL);
}

/*
 * This is the generic event handler we are registering with
 * the Hypervisor.  Ensure the flows are for us, and then
 * parse it enough to know if it is an interrupt or an
 * acknowledge.
 */
static void hv_handler(struct HvLpEvent *event)
{
        if ((event != NULL) && (event->xType == HvLpEvent_Type_MachineFac)) {
                if (hvlpevent_is_ack(event))
                        handle_ack((struct io_mf_lp_event *)event);
                else
                        handle_int((struct io_mf_lp_event *)event);
        } else
                printk(KERN_ERR "mf.c: alien event received\n");
}

/*
 * Global kernel interface to allocate and seed events into the
 * Hypervisor.
 */
void mf_allocate_lp_events(HvLpIndex target_lp, HvLpEvent_Type type,
                unsigned size, unsigned count, MFCompleteHandler hdlr,
                void *user_token)
{
        struct pending_event *ev = new_pending_event();
        int rc;

        if (ev == NULL) {
                rc = -ENOMEM;
        } else {
                ev->event.hp_lp_event.xSubtype = 4;
                ev->event.hp_lp_event.xCorrelationToken = (u64)user_token;
                ev->event.hp_lp_event.x.xSubtypeData =
                        subtype_data('M', 'F', 'M', 'A');
                ev->event.data.alloc.target_lp = target_lp;
                ev->event.data.alloc.type = type;
                ev->event.data.alloc.size = size;
                ev->event.data.alloc.count = count;
                ev->hdlr = hdlr;
                rc = signal_event(ev);
        }
        if ((rc != 0) && (hdlr != NULL))
                (*hdlr)(user_token, rc);
}
EXPORT_SYMBOL(mf_allocate_lp_events);

/*
 * Global kernel interface to unseed and deallocate events already in
 * Hypervisor.
 */
void mf_deallocate_lp_events(HvLpIndex target_lp, HvLpEvent_Type type,
                unsigned count, MFCompleteHandler hdlr, void *user_token)
{
        struct pending_event *ev = new_pending_event();
        int rc;

        if (ev == NULL)
                rc = -ENOMEM;
        else {
                ev->event.hp_lp_event.xSubtype = 5;
                ev->event.hp_lp_event.xCorrelationToken = (u64)user_token;
                ev->event.hp_lp_event.x.xSubtypeData =
                        subtype_data('M', 'F', 'M', 'D');
                ev->event.data.alloc.target_lp = target_lp;
                ev->event.data.alloc.type = type;
                ev->event.data.alloc.count = count;
                ev->hdlr = hdlr;
                rc = signal_event(ev);
        }
        if ((rc != 0) && (hdlr != NULL))
                (*hdlr)(user_token, rc);
}
EXPORT_SYMBOL(mf_deallocate_lp_events);

/*
 * Global kernel interface to tell the VSP object in the primary
 * partition to power this partition off.
 */
void mf_power_off(void)
{
        printk(KERN_INFO "mf.c: Down it goes...\n");
        signal_ce_msg_simple(0x4d, NULL);
        for (;;)
                ;
}

/*
 * Global kernel interface to tell the VSP object in the primary
 * partition to reboot this partition.
 */
void mf_reboot(char *cmd)
{
        printk(KERN_INFO "mf.c: Preparing to bounce...\n");
        signal_ce_msg_simple(0x4e, NULL);
        for (;;)
                ;
}

/*
 * Display a single word SRC onto the VSP control panel.
 */
void mf_display_src(u32 word)
{
        u8 ce[12];

        memset(ce, 0, sizeof(ce));
        ce[3] = 0x4a;
        ce[7] = 0x01;
        ce[8] = word >> 24;
        ce[9] = word >> 16;
        ce[10] = word >> 8;
        ce[11] = word;
        signal_ce_msg(ce, NULL);
}

/*
 * Display a single word SRC of the form "PROGXXXX" on the VSP control panel.
 */
static __init void mf_display_progress_src(u16 value)
{
        u8 ce[12];
        u8 src[72];

        memcpy(ce, "\x00\x00\x04\x4A\x00\x00\x00\x48\x00\x00\x00\x00", 12);
        memcpy(src, "\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
                "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                "\x00\x00\x00\x00PROGxxxx                        ",
                72);
        src[6] = value >> 8;
        src[7] = value & 255;
        src[44] = "0123456789ABCDEF"[(value >> 12) & 15];
        src[45] = "0123456789ABCDEF"[(value >> 8) & 15];
        src[46] = "0123456789ABCDEF"[(value >> 4) & 15];
        src[47] = "0123456789ABCDEF"[value & 15];
        dma_and_signal_ce_msg(ce, NULL, src, sizeof(src), 9 * 64 * 1024);
}

/*
 * Clear the VSP control panel.  Used to "erase" an SRC that was
 * previously displayed.
 */
static void mf_clear_src(void)
{
        signal_ce_msg_simple(0x4b, NULL);
}

void __init mf_display_progress(u16 value)
{
        if (!mf_initialized)
                return;

        if (0xFFFF == value)
                mf_clear_src();
        else
                mf_display_progress_src(value);
}

/*
 * Initialization code here.
 */
void __init mf_init(void)
{
        int i;

        spin_lock_init(&pending_event_spinlock);

        for (i = 0; i < PENDING_EVENT_PREALLOC_LEN; i++)
                free_pending_event(&pending_event_prealloc[i]);

        HvLpEvent_registerHandler(HvLpEvent_Type_MachineFac, &hv_handler);

        /* virtual continue ack */
        signal_ce_msg_simple(0x57, NULL);

        mf_initialized = 1;
        mb();

        printk(KERN_NOTICE "mf.c: iSeries Linux LPAR Machine Facilities "
                        "initialized\n");
}

struct rtc_time_data {
        struct completion com;
        struct ce_msg_data ce_msg;
        int rc;
};

static void get_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
{
        struct rtc_time_data *rtc = token;

        memcpy(&rtc->ce_msg, ce_msg, sizeof(rtc->ce_msg));
        rtc->rc = 0;
        complete(&rtc->com);
}

static int mf_set_rtc(struct rtc_time *tm)
{
        char ce_time[12];
        u8 day, mon, hour, min, sec, y1, y2;
        unsigned year;

        year = 1900 + tm->tm_year;
        y1 = year / 100;
        y2 = year % 100;

        sec = tm->tm_sec;
        min = tm->tm_min;
        hour = tm->tm_hour;
        day = tm->tm_mday;
        mon = tm->tm_mon + 1;

        sec = bin2bcd(sec);
        min = bin2bcd(min);
        hour = bin2bcd(hour);
        mon = bin2bcd(mon);
        day = bin2bcd(day);
        y1 = bin2bcd(y1);
        y2 = bin2bcd(y2);

        memset(ce_time, 0, sizeof(ce_time));
        ce_time[3] = 0x41;
        ce_time[4] = y1;
        ce_time[5] = y2;
        ce_time[6] = sec;
        ce_time[7] = min;
        ce_time[8] = hour;
        ce_time[10] = day;
        ce_time[11] = mon;

        return signal_ce_msg(ce_time, NULL);
}

static int rtc_set_tm(int rc, u8 *ce_msg, struct rtc_time *tm)
{
        tm->tm_wday = 0;
        tm->tm_yday = 0;
        tm->tm_isdst = 0;
        if (rc) {
                tm->tm_sec = 0;
                tm->tm_min = 0;
                tm->tm_hour = 0;
                tm->tm_mday = 15;
                tm->tm_mon = 5;
                tm->tm_year = 52;
                return rc;
        }

        if ((ce_msg[2] == 0xa9) ||
            (ce_msg[2] == 0xaf)) {
                /* TOD clock is not set */
                tm->tm_sec = 1;
                tm->tm_min = 1;
                tm->tm_hour = 1;
                tm->tm_mday = 10;
                tm->tm_mon = 8;
                tm->tm_year = 71;
                mf_set_rtc(tm);
        }
        {
                u8 year = ce_msg[5];
                u8 sec = ce_msg[6];
                u8 min = ce_msg[7];
                u8 hour = ce_msg[8];
                u8 day = ce_msg[10];
                u8 mon = ce_msg[11];

                sec = bcd2bin(sec);
                min = bcd2bin(min);
                hour = bcd2bin(hour);
                day = bcd2bin(day);
                mon = bcd2bin(mon);
                year = bcd2bin(year);

                if (year <= 69)
                        year += 100;

                tm->tm_sec = sec;
                tm->tm_min = min;
                tm->tm_hour = hour;
                tm->tm_mday = day;
                tm->tm_mon = mon;
                tm->tm_year = year;
        }

        return 0;
}

static int mf_get_rtc(struct rtc_time *tm)
{
        struct ce_msg_comp_data ce_complete;
        struct rtc_time_data rtc_data;
        int rc;

        memset(&ce_complete, 0, sizeof(ce_complete));
        memset(&rtc_data, 0, sizeof(rtc_data));
        init_completion(&rtc_data.com);
        ce_complete.handler = &get_rtc_time_complete;
        ce_complete.token = &rtc_data;
        rc = signal_ce_msg_simple(0x40, &ce_complete);
        if (rc)
                return rc;
        wait_for_completion(&rtc_data.com);
        return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
}

struct boot_rtc_time_data {
        int busy;
        struct ce_msg_data ce_msg;
        int rc;
};

static void get_boot_rtc_time_complete(void *token, struct ce_msg_data *ce_msg)
{
        struct boot_rtc_time_data *rtc = token;

        memcpy(&rtc->ce_msg, ce_msg, sizeof(rtc->ce_msg));
        rtc->rc = 0;
        rtc->busy = 0;
}

static int mf_get_boot_rtc(struct rtc_time *tm)
{
        struct ce_msg_comp_data ce_complete;
        struct boot_rtc_time_data rtc_data;
        int rc;

        memset(&ce_complete, 0, sizeof(ce_complete));
        memset(&rtc_data, 0, sizeof(rtc_data));
        rtc_data.busy = 1;
        ce_complete.handler = &get_boot_rtc_time_complete;
        ce_complete.token = &rtc_data;
        rc = signal_ce_msg_simple(0x40, &ce_complete);
        if (rc)
                return rc;
        /* We need to poll here as we are not yet taking interrupts */
        while (rtc_data.busy) {
                if (hvlpevent_is_pending())
                        process_hvlpevents();
        }
        return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm);
}

#ifdef CONFIG_PROC_FS
static int mf_cmdline_proc_show(struct seq_file *m, void *v)
{
        char *page, *p;
        struct vsp_cmd_data vsp_cmd;
        int rc;
        dma_addr_t dma_addr;

        /* The HV appears to return no more than 256 bytes of command line */
        page = kmalloc(256, GFP_KERNEL);
        if (!page)
                return -ENOMEM;

        dma_addr = iseries_hv_map(page, 256, DMA_FROM_DEVICE);
        if (dma_addr == DMA_ERROR_CODE) {
                kfree(page);
                return -ENOMEM;
        }
        memset(page, 0, 256);
        memset(&vsp_cmd, 0, sizeof(vsp_cmd));
        vsp_cmd.cmd = 33;
        vsp_cmd.sub_data.kern.token = dma_addr;
        vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
        vsp_cmd.sub_data.kern.side = (u64)m->private;
        vsp_cmd.sub_data.kern.length = 256;
        mb();
        rc = signal_vsp_instruction(&vsp_cmd);
        iseries_hv_unmap(dma_addr, 256, DMA_FROM_DEVICE);
        if (rc) {
                kfree(page);
                return rc;
        }
        if (vsp_cmd.result_code != 0) {
                kfree(page);
                return -ENOMEM;
        }
        p = page;
        while (p - page < 256) {
                if (*p == '\0' || *p == '\n') {
                        *p = '\n';
                        break;
                }
                p++;

        }
        seq_write(m, page, p - page);
        kfree(page);
        return 0;
}

static int mf_cmdline_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, mf_cmdline_proc_show, PDE(inode)->data);
}

#if 0
static int mf_getVmlinuxChunk(char *buffer, int *size, int offset, u64 side)
{
        struct vsp_cmd_data vsp_cmd;
        int rc;
        int len = *size;
        dma_addr_t dma_addr;

        dma_addr = iseries_hv_map(buffer, len, DMA_FROM_DEVICE);
        memset(buffer, 0, len);
        memset(&vsp_cmd, 0, sizeof(vsp_cmd));
        vsp_cmd.cmd = 32;
        vsp_cmd.sub_data.kern.token = dma_addr;
        vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
        vsp_cmd.sub_data.kern.side = side;
        vsp_cmd.sub_data.kern.offset = offset;
        vsp_cmd.sub_data.kern.length = len;
        mb();
        rc = signal_vsp_instruction(&vsp_cmd);
        if (rc == 0) {
                if (vsp_cmd.result_code == 0)
                        *size = vsp_cmd.sub_data.length_out;
                else
                        rc = -ENOMEM;
        }

        iseries_hv_unmap(dma_addr, len, DMA_FROM_DEVICE);

        return rc;
}

static int proc_mf_dump_vmlinux(char *page, char **start, off_t off,
                int count, int *eof, void *data)
{
        int sizeToGet = count;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        if (mf_getVmlinuxChunk(page, &sizeToGet, off, (u64)data) == 0) {
                if (sizeToGet != 0) {
                        *start = page + off;
                        return sizeToGet;
                }
                *eof = 1;
                return 0;
        }
        *eof = 1;
        return 0;
}
#endif

static int mf_side_proc_show(struct seq_file *m, void *v)
{
        char mf_current_side = ' ';
        struct vsp_cmd_data vsp_cmd;

        memset(&vsp_cmd, 0, sizeof(vsp_cmd));
        vsp_cmd.cmd = 2;
        vsp_cmd.sub_data.ipl_type = 0;
        mb();

        if (signal_vsp_instruction(&vsp_cmd) == 0) {
                if (vsp_cmd.result_code == 0) {
                        switch (vsp_cmd.sub_data.ipl_type) {
                        case 0: mf_current_side = 'A';
                                break;
                        case 1: mf_current_side = 'B';
                                break;
                        case 2: mf_current_side = 'C';
                                break;
                        default:        mf_current_side = 'D';
                                break;
                        }
                }
        }

        seq_printf(m, "%c\n", mf_current_side);
        return 0;
}

static int mf_side_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, mf_side_proc_show, NULL);
}

static ssize_t mf_side_proc_write(struct file *file, const char __user *buffer,

                                  size_t count, loff_t *pos)
{
        char side;
        u64 newSide;
        struct vsp_cmd_data vsp_cmd;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        if (count == 0)
                return 0;

        if (get_user(side, buffer))
                return -EFAULT;

        switch (side) {
        case 'A':       newSide = 0;
                        break;
        case 'B':       newSide = 1;
                        break;
        case 'C':       newSide = 2;
                        break;
        case 'D':       newSide = 3;
                        break;
        default:
                printk(KERN_ERR "mf_proc.c: proc_mf_change_side: invalid side\n");
                return -EINVAL;
        }

        memset(&vsp_cmd, 0, sizeof(vsp_cmd));
        vsp_cmd.sub_data.ipl_type = newSide;
        vsp_cmd.cmd = 10;

        (void)signal_vsp_instruction(&vsp_cmd);

        return count;
}

static const struct file_operations mf_side_proc_fops = {
        .owner          = THIS_MODULE,
        .open           = mf_side_proc_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
        .write          = mf_side_proc_write,
};

static int mf_src_proc_show(struct seq_file *m, void *v)
{
        return 0;
}

static int mf_src_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, mf_src_proc_show, NULL);
}

static ssize_t mf_src_proc_write(struct file *file, const char __user *buffer,
                                 size_t count, loff_t *pos)
{
        char stkbuf[10];

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        if ((count < 4) && (count != 1)) {
                printk(KERN_ERR "mf_proc: invalid src\n");
                return -EINVAL;
        }

        if (count > (sizeof(stkbuf) - 1))
                count = sizeof(stkbuf) - 1;
        if (copy_from_user(stkbuf, buffer, count))
                return -EFAULT;

        if ((count == 1) && (*stkbuf == '\0'))
                mf_clear_src();
        else
                mf_display_src(*(u32 *)stkbuf);

        return count;
}

static const struct file_operations mf_src_proc_fops = {
        .owner          = THIS_MODULE,
        .open           = mf_src_proc_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
        .write          = mf_src_proc_write,
};

static ssize_t mf_cmdline_proc_write(struct file *file, const char __user *buffer,
                                     size_t count, loff_t *pos)
{
        void *data = PDE(file->f_path.dentry->d_inode)->data;
        struct vsp_cmd_data vsp_cmd;
        dma_addr_t dma_addr;
        char *page;
        int ret = -EACCES;

        if (!capable(CAP_SYS_ADMIN))
                goto out;

        dma_addr = 0;
        page = iseries_hv_alloc(count, &dma_addr, GFP_ATOMIC);
        ret = -ENOMEM;
        if (page == NULL)
                goto out;

        ret = -EFAULT;
        if (copy_from_user(page, buffer, count))
                goto out_free;

        memset(&vsp_cmd, 0, sizeof(vsp_cmd));
        vsp_cmd.cmd = 31;
        vsp_cmd.sub_data.kern.token = dma_addr;
        vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
        vsp_cmd.sub_data.kern.side = (u64)data;
        vsp_cmd.sub_data.kern.length = count;
        mb();
        (void)signal_vsp_instruction(&vsp_cmd);
        ret = count;

out_free:
        iseries_hv_free(count, page, dma_addr);
out:
        return ret;
}

static const struct file_operations mf_cmdline_proc_fops = {
        .owner          = THIS_MODULE,
        .open           = mf_cmdline_proc_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
        .write          = mf_cmdline_proc_write,
};

static ssize_t proc_mf_change_vmlinux(struct file *file,
                                      const char __user *buf,
                                      size_t count, loff_t *ppos)
{
        struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
        ssize_t rc;
        dma_addr_t dma_addr;
        char *page;
        struct vsp_cmd_data vsp_cmd;

        rc = -EACCES;
        if (!capable(CAP_SYS_ADMIN))
                goto out;

        dma_addr = 0;
        page = iseries_hv_alloc(count, &dma_addr, GFP_ATOMIC);
        rc = -ENOMEM;
        if (page == NULL) {
                printk(KERN_ERR "mf.c: couldn't allocate memory to set vmlinux chunk\n");
                goto out;
        }
        rc = -EFAULT;
        if (copy_from_user(page, buf, count))
                goto out_free;

        memset(&vsp_cmd, 0, sizeof(vsp_cmd));
        vsp_cmd.cmd = 30;
        vsp_cmd.sub_data.kern.token = dma_addr;
        vsp_cmd.sub_data.kern.address_type = HvLpDma_AddressType_TceIndex;
        vsp_cmd.sub_data.kern.side = (u64)dp->data;
        vsp_cmd.sub_data.kern.offset = *ppos;
        vsp_cmd.sub_data.kern.length = count;
        mb();
        rc = signal_vsp_instruction(&vsp_cmd);
        if (rc)
                goto out_free;
        rc = -ENOMEM;
        if (vsp_cmd.result_code != 0)
                goto out_free;

        *ppos += count;
        rc = count;
out_free:
        iseries_hv_free(count, page, dma_addr);
out:
        return rc;
}

static const struct file_operations proc_vmlinux_operations = {
        .write          = proc_mf_change_vmlinux,
        .llseek         = default_llseek,
};

static int __init mf_proc_init(void)
{
        struct proc_dir_entry *mf_proc_root;
        struct proc_dir_entry *ent;
        struct proc_dir_entry *mf;
        char name[2];
        int i;

        if (!firmware_has_feature(FW_FEATURE_ISERIES))
                return 0;

        mf_proc_root = proc_mkdir("iSeries/mf", NULL);
        if (!mf_proc_root)
                return 1;

        name[1] = '\0';
        for (i = 0; i < 4; i++) {
                name[0] = 'A' + i;
                mf = proc_mkdir(name, mf_proc_root);
                if (!mf)
                        return 1;

                ent = proc_create_data("cmdline", S_IRUSR|S_IWUSR, mf,
                                       &mf_cmdline_proc_fops, (void *)(long)i);
                if (!ent)
                        return 1;

                if (i == 3)     /* no vmlinux entry for 'D' */
                        continue;

                ent = proc_create_data("vmlinux", S_IFREG|S_IWUSR, mf,
                                       &proc_vmlinux_operations,
                                       (void *)(long)i);
                if (!ent)
                        return 1;
        }

        ent = proc_create("side", S_IFREG|S_IRUSR|S_IWUSR, mf_proc_root,
                          &mf_side_proc_fops);
        if (!ent)
                return 1;

        ent = proc_create("src", S_IFREG|S_IRUSR|S_IWUSR, mf_proc_root,
                          &mf_src_proc_fops);
        if (!ent)
                return 1;

        return 0;
}

__initcall(mf_proc_init);

#endif /* CONFIG_PROC_FS */

/*
 * Get the RTC from the virtual service processor
 * This requires flowing LpEvents to the primary partition
 */
void iSeries_get_rtc_time(struct rtc_time *rtc_tm)
{
        mf_get_rtc(rtc_tm);
        rtc_tm->tm_mon--;
}

/*
 * Set the RTC in the virtual service processor
 * This requires flowing LpEvents to the primary partition
 */
int iSeries_set_rtc_time(struct rtc_time *tm)
{
        mf_set_rtc(tm);
        return 0;
}

unsigned long iSeries_get_boot_time(void)
{
        struct rtc_time tm;

        mf_get_boot_rtc(&tm);
        return mktime(tm.tm_year + 1900, tm.tm_mon, tm.tm_mday,
                      tm.tm_hour, tm.tm_min, tm.tm_sec);
}