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ms_block.c
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/*
* ms_block.c - Sony MemoryStick (legacy) storage support
* Copyright (C) 2013 Maxim Levitsky <maximlevitsky@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Minor portions of the driver were copied from mspro_block.c which is
* Copyright (C) 2007 Alex Dubov <oakad@yahoo.com>
*
*/
#define DRIVER_NAME "ms_block"
#define pr_fmt(fmt) DRIVER_NAME ": " fmt
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/memstick.h>
#include <linux/idr.h>
#include <linux/hdreg.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/bitmap.h>
#include <linux/scatterlist.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include "ms_block.h"
static int debug;
static int cache_flush_timeout = 1000;
static bool verify_writes;
/*
* Copies section of 'sg_from' starting from offset 'offset' and with length
* 'len' To another scatterlist of to_nents enties
*/
static size_t msb_sg_copy(struct scatterlist *sg_from,
struct scatterlist *sg_to, int to_nents, size_t offset, size_t len)
{
size_t copied = 0;
while (offset > 0) {
if (offset >= sg_from->length) {
if (sg_is_last(sg_from))
return 0;
offset -= sg_from->length;
sg_from = sg_next(sg_from);
continue;
}
copied = min(len, sg_from->length - offset);
sg_set_page(sg_to, sg_page(sg_from),
copied, sg_from->offset + offset);
len -= copied;
offset = 0;
if (sg_is_last(sg_from) || !len)
goto out;
sg_to = sg_next(sg_to);
to_nents--;
sg_from = sg_next(sg_from);
}
while (len > sg_from->length && to_nents--) {
len -= sg_from->length;
copied += sg_from->length;
sg_set_page(sg_to, sg_page(sg_from),
sg_from->length, sg_from->offset);
if (sg_is_last(sg_from) || !len)
goto out;
sg_from = sg_next(sg_from);
sg_to = sg_next(sg_to);
}
if (len && to_nents) {
sg_set_page(sg_to, sg_page(sg_from), len, sg_from->offset);
copied += len;
}
out:
sg_mark_end(sg_to);
return copied;
}
/*
* Compares section of 'sg' starting from offset 'offset' and with length 'len'
* to linear buffer of length 'len' at address 'buffer'
* Returns 0 if equal and -1 otherwice
*/
static int msb_sg_compare_to_buffer(struct scatterlist *sg,
size_t offset, u8 *buffer, size_t len)
{
int retval = 0, cmplen;
struct sg_mapping_iter miter;
sg_miter_start(&miter, sg, sg_nents(sg),
SG_MITER_ATOMIC | SG_MITER_FROM_SG);
while (sg_miter_next(&miter) && len > 0) {
if (offset >= miter.length) {
offset -= miter.length;
continue;
}
cmplen = min(miter.length - offset, len);
retval = memcmp(miter.addr + offset, buffer, cmplen) ? -1 : 0;
if (retval)
break;
buffer += cmplen;
len -= cmplen;
offset = 0;
}
if (!retval && len)
retval = -1;
sg_miter_stop(&miter);
return retval;
}
/* Get zone at which block with logical address 'lba' lives
* Flash is broken into zones.
* Each zone consists of 512 eraseblocks, out of which in first
* zone 494 are used and 496 are for all following zones.
* Therefore zone #0 hosts blocks 0-493, zone #1 blocks 494-988, etc...
*/
static int msb_get_zone_from_lba(int lba)
{
if (lba < 494)
return 0;
return ((lba - 494) / 496) + 1;
}
/* Get zone of physical block. Trivial */
static int msb_get_zone_from_pba(int pba)
{
return pba / MS_BLOCKS_IN_ZONE;
}
/* Debug test to validate free block counts */
static int msb_validate_used_block_bitmap(struct msb_data *msb)
{
int total_free_blocks = 0;
int i;
if (!debug)
return 0;
for (i = 0; i < msb->zone_count; i++)
total_free_blocks += msb->free_block_count[i];
if (msb->block_count - bitmap_weight(msb->used_blocks_bitmap,
msb->block_count) == total_free_blocks)
return 0;
pr_err("BUG: free block counts don't match the bitmap");
msb->read_only = true;
return -EINVAL;
}
/* Mark physical block as used */
static void msb_mark_block_used(struct msb_data *msb, int pba)
{
int zone = msb_get_zone_from_pba(pba);
if (test_bit(pba, msb->used_blocks_bitmap)) {
pr_err(
"BUG: attempt to mark already used pba %d as used", pba);
msb->read_only = true;
return;
}
if (msb_validate_used_block_bitmap(msb))
return;
/* No races because all IO is single threaded */
__set_bit(pba, msb->used_blocks_bitmap);
msb->free_block_count[zone]--;
}
/* Mark physical block as free */
static void msb_mark_block_unused(struct msb_data *msb, int pba)
{
int zone = msb_get_zone_from_pba(pba);
if (!test_bit(pba, msb->used_blocks_bitmap)) {
pr_err("BUG: attempt to mark already unused pba %d as unused" , pba);
msb->read_only = true;
return;
}
if (msb_validate_used_block_bitmap(msb))
return;
/* No races because all IO is single threaded */
__clear_bit(pba, msb->used_blocks_bitmap);
msb->free_block_count[zone]++;
}
/* Invalidate current register window */
static void msb_invalidate_reg_window(struct msb_data *msb)
{
msb->reg_addr.w_offset = offsetof(struct ms_register, id);
msb->reg_addr.w_length = sizeof(struct ms_id_register);
msb->reg_addr.r_offset = offsetof(struct ms_register, id);
msb->reg_addr.r_length = sizeof(struct ms_id_register);
msb->addr_valid = false;
}
/* Start a state machine */
static int msb_run_state_machine(struct msb_data *msb, int (*state_func)
(struct memstick_dev *card, struct memstick_request **req))
{
struct memstick_dev *card = msb->card;
WARN_ON(msb->state != -1);
msb->int_polling = false;
msb->state = 0;
msb->exit_error = 0;
memset(&card->current_mrq, 0, sizeof(card->current_mrq));
card->next_request = state_func;
memstick_new_req(card->host);
wait_for_completion(&card->mrq_complete);
WARN_ON(msb->state != -1);
return msb->exit_error;
}
/* State machines call that to exit */
static int msb_exit_state_machine(struct msb_data *msb, int error)
{
WARN_ON(msb->state == -1);
msb->state = -1;
msb->exit_error = error;
msb->card->next_request = h_msb_default_bad;
/* Invalidate reg window on errors */
if (error)
msb_invalidate_reg_window(msb);
complete(&msb->card->mrq_complete);
return -ENXIO;
}
/* read INT register */
static int msb_read_int_reg(struct msb_data *msb, long timeout)
{
struct memstick_request *mrq = &msb->card->current_mrq;
WARN_ON(msb->state == -1);
if (!msb->int_polling) {
msb->int_timeout = jiffies +
msecs_to_jiffies(timeout == -1 ? 500 : timeout);
msb->int_polling = true;
} else if (time_after(jiffies, msb->int_timeout)) {
mrq->data[0] = MEMSTICK_INT_CMDNAK;
return 0;
}
if ((msb->caps & MEMSTICK_CAP_AUTO_GET_INT) &&
mrq->need_card_int && !mrq->error) {
mrq->data[0] = mrq->int_reg;
mrq->need_card_int = false;
return 0;
} else {
memstick_init_req(mrq, MS_TPC_GET_INT, NULL, 1);
return 1;
}
}
/* Read a register */
static int msb_read_regs(struct msb_data *msb, int offset, int len)
{
struct memstick_request *req = &msb->card->current_mrq;
if (msb->reg_addr.r_offset != offset ||
msb->reg_addr.r_length != len || !msb->addr_valid) {
msb->reg_addr.r_offset = offset;
msb->reg_addr.r_length = len;
msb->addr_valid = true;
memstick_init_req(req, MS_TPC_SET_RW_REG_ADRS,
&msb->reg_addr, sizeof(msb->reg_addr));
return 0;
}
memstick_init_req(req, MS_TPC_READ_REG, NULL, len);
return 1;
}
/* Write a card register */
static int msb_write_regs(struct msb_data *msb, int offset, int len, void *buf)
{
struct memstick_request *req = &msb->card->current_mrq;
if (msb->reg_addr.w_offset != offset ||
msb->reg_addr.w_length != len || !msb->addr_valid) {
msb->reg_addr.w_offset = offset;
msb->reg_addr.w_length = len;
msb->addr_valid = true;
memstick_init_req(req, MS_TPC_SET_RW_REG_ADRS,
&msb->reg_addr, sizeof(msb->reg_addr));
return 0;
}
memstick_init_req(req, MS_TPC_WRITE_REG, buf, len);
return 1;
}
/* Handler for absence of IO */
static int h_msb_default_bad(struct memstick_dev *card,
struct memstick_request **mrq)
{
return -ENXIO;
}
/*
* This function is a handler for reads of one page from device.
* Writes output to msb->current_sg, takes sector address from msb->reg.param
* Can also be used to read extra data only. Set params accordintly.
*/
static int h_msb_read_page(struct memstick_dev *card,
struct memstick_request **out_mrq)
{
struct msb_data *msb = memstick_get_drvdata(card);
struct memstick_request *mrq = *out_mrq = &card->current_mrq;
struct scatterlist sg[2];
u8 command, intreg;
if (mrq->error) {
dbg("read_page, unknown error");
return msb_exit_state_machine(msb, mrq->error);
}
again:
switch (msb->state) {
case MSB_RP_SEND_BLOCK_ADDRESS:
/* msb_write_regs sometimes "fails" because it needs to update
the reg window, and thus it returns request for that.
Then we stay in this state and retry */
if (!msb_write_regs(msb,
offsetof(struct ms_register, param),
sizeof(struct ms_param_register),
(unsigned char *)&msb->regs.param))
return 0;
msb->state = MSB_RP_SEND_READ_COMMAND;
return 0;
case MSB_RP_SEND_READ_COMMAND:
command = MS_CMD_BLOCK_READ;
memstick_init_req(mrq, MS_TPC_SET_CMD, &command, 1);
msb->state = MSB_RP_SEND_INT_REQ;
return 0;
case MSB_RP_SEND_INT_REQ:
msb->state = MSB_RP_RECEIVE_INT_REQ_RESULT;
/* If dont actually need to send the int read request (only in
serial mode), then just fall through */
if (msb_read_int_reg(msb, -1))
return 0;
/* fallthrough */
case MSB_RP_RECEIVE_INT_REQ_RESULT:
intreg = mrq->data[0];
msb->regs.status.interrupt = intreg;
if (intreg & MEMSTICK_INT_CMDNAK)
return msb_exit_state_machine(msb, -EIO);
if (!(intreg & MEMSTICK_INT_CED)) {
msb->state = MSB_RP_SEND_INT_REQ;
goto again;
}
msb->int_polling = false;
msb->state = (intreg & MEMSTICK_INT_ERR) ?
MSB_RP_SEND_READ_STATUS_REG : MSB_RP_SEND_OOB_READ;
goto again;
case MSB_RP_SEND_READ_STATUS_REG:
/* read the status register to understand source of the INT_ERR */
if (!msb_read_regs(msb,
offsetof(struct ms_register, status),
sizeof(struct ms_status_register)))
return 0;
msb->state = MSB_RP_RECEIVE_STATUS_REG;
return 0;
case MSB_RP_RECEIVE_STATUS_REG:
msb->regs.status = *(struct ms_status_register *)mrq->data;
msb->state = MSB_RP_SEND_OOB_READ;
/* fallthrough */
case MSB_RP_SEND_OOB_READ:
if (!msb_read_regs(msb,
offsetof(struct ms_register, extra_data),
sizeof(struct ms_extra_data_register)))
return 0;
msb->state = MSB_RP_RECEIVE_OOB_READ;
return 0;
case MSB_RP_RECEIVE_OOB_READ:
msb->regs.extra_data =
*(struct ms_extra_data_register *) mrq->data;
msb->state = MSB_RP_SEND_READ_DATA;
/* fallthrough */
case MSB_RP_SEND_READ_DATA:
/* Skip that state if we only read the oob */
if (msb->regs.param.cp == MEMSTICK_CP_EXTRA) {
msb->state = MSB_RP_RECEIVE_READ_DATA;
goto again;
}
sg_init_table(sg, ARRAY_SIZE(sg));
msb_sg_copy(msb->current_sg, sg, ARRAY_SIZE(sg),
msb->current_sg_offset,
msb->page_size);
memstick_init_req_sg(mrq, MS_TPC_READ_LONG_DATA, sg);
msb->state = MSB_RP_RECEIVE_READ_DATA;
return 0;
case MSB_RP_RECEIVE_READ_DATA:
if (!(msb->regs.status.interrupt & MEMSTICK_INT_ERR)) {
msb->current_sg_offset += msb->page_size;
return msb_exit_state_machine(msb, 0);
}
if (msb->regs.status.status1 & MEMSTICK_UNCORR_ERROR) {
dbg("read_page: uncorrectable error");
return msb_exit_state_machine(msb, -EBADMSG);
}
if (msb->regs.status.status1 & MEMSTICK_CORR_ERROR) {
dbg("read_page: correctable error");
msb->current_sg_offset += msb->page_size;
return msb_exit_state_machine(msb, -EUCLEAN);
} else {
dbg("read_page: INT error, but no status error bits");
return msb_exit_state_machine(msb, -EIO);
}
}
BUG();
}
/*
* Handler of writes of exactly one block.
* Takes address from msb->regs.param.
* Writes same extra data to blocks, also taken
* from msb->regs.extra
* Returns -EBADMSG if write fails due to uncorrectable error, or -EIO if
* device refuses to take the command or something else
*/
static int h_msb_write_block(struct memstick_dev *card,
struct memstick_request **out_mrq)
{
struct msb_data *msb = memstick_get_drvdata(card);
struct memstick_request *mrq = *out_mrq = &card->current_mrq;
struct scatterlist sg[2];
u8 intreg, command;
if (mrq->error)
return msb_exit_state_machine(msb, mrq->error);
again:
switch (msb->state) {
/* HACK: Jmicon handling of TPCs between 8 and
* sizeof(memstick_request.data) is broken due to hardware
* bug in PIO mode that is used for these TPCs
* Therefore split the write
*/
case MSB_WB_SEND_WRITE_PARAMS:
if (!msb_write_regs(msb,
offsetof(struct ms_register, param),
sizeof(struct ms_param_register),
&msb->regs.param))
return 0;
msb->state = MSB_WB_SEND_WRITE_OOB;
return 0;
case MSB_WB_SEND_WRITE_OOB:
if (!msb_write_regs(msb,
offsetof(struct ms_register, extra_data),
sizeof(struct ms_extra_data_register),
&msb->regs.extra_data))
return 0;
msb->state = MSB_WB_SEND_WRITE_COMMAND;
return 0;
case MSB_WB_SEND_WRITE_COMMAND:
command = MS_CMD_BLOCK_WRITE;
memstick_init_req(mrq, MS_TPC_SET_CMD, &command, 1);
msb->state = MSB_WB_SEND_INT_REQ;
return 0;
case MSB_WB_SEND_INT_REQ:
msb->state = MSB_WB_RECEIVE_INT_REQ;
if (msb_read_int_reg(msb, -1))
return 0;
/* fallthrough */
case MSB_WB_RECEIVE_INT_REQ:
intreg = mrq->data[0];
msb->regs.status.interrupt = intreg;
/* errors mean out of here, and fast... */
if (intreg & (MEMSTICK_INT_CMDNAK))
return msb_exit_state_machine(msb, -EIO);
if (intreg & MEMSTICK_INT_ERR)
return msb_exit_state_machine(msb, -EBADMSG);
/* for last page we need to poll CED */
if (msb->current_page == msb->pages_in_block) {
if (intreg & MEMSTICK_INT_CED)
return msb_exit_state_machine(msb, 0);
msb->state = MSB_WB_SEND_INT_REQ;
goto again;
}
/* for non-last page we need BREQ before writing next chunk */
if (!(intreg & MEMSTICK_INT_BREQ)) {
msb->state = MSB_WB_SEND_INT_REQ;
goto again;
}
msb->int_polling = false;
msb->state = MSB_WB_SEND_WRITE_DATA;
/* fallthrough */
case MSB_WB_SEND_WRITE_DATA:
sg_init_table(sg, ARRAY_SIZE(sg));
if (msb_sg_copy(msb->current_sg, sg, ARRAY_SIZE(sg),
msb->current_sg_offset,
msb->page_size) < msb->page_size)
return msb_exit_state_machine(msb, -EIO);
memstick_init_req_sg(mrq, MS_TPC_WRITE_LONG_DATA, sg);
mrq->need_card_int = 1;
msb->state = MSB_WB_RECEIVE_WRITE_CONFIRMATION;
return 0;
case MSB_WB_RECEIVE_WRITE_CONFIRMATION:
msb->current_page++;
msb->current_sg_offset += msb->page_size;
msb->state = MSB_WB_SEND_INT_REQ;
goto again;
default:
BUG();
}
return 0;
}
/*
* This function is used to send simple IO requests to device that consist
* of register write + command
*/
static int h_msb_send_command(struct memstick_dev *card,
struct memstick_request **out_mrq)
{
struct msb_data *msb = memstick_get_drvdata(card);
struct memstick_request *mrq = *out_mrq = &card->current_mrq;
u8 intreg;
if (mrq->error) {
dbg("send_command: unknown error");
return msb_exit_state_machine(msb, mrq->error);
}
again:
switch (msb->state) {
/* HACK: see h_msb_write_block */
case MSB_SC_SEND_WRITE_PARAMS: /* write param register*/
if (!msb_write_regs(msb,
offsetof(struct ms_register, param),
sizeof(struct ms_param_register),
&msb->regs.param))
return 0;
msb->state = MSB_SC_SEND_WRITE_OOB;
return 0;
case MSB_SC_SEND_WRITE_OOB:
if (!msb->command_need_oob) {
msb->state = MSB_SC_SEND_COMMAND;
goto again;
}
if (!msb_write_regs(msb,
offsetof(struct ms_register, extra_data),
sizeof(struct ms_extra_data_register),
&msb->regs.extra_data))
return 0;
msb->state = MSB_SC_SEND_COMMAND;
return 0;
case MSB_SC_SEND_COMMAND:
memstick_init_req(mrq, MS_TPC_SET_CMD, &msb->command_value, 1);
msb->state = MSB_SC_SEND_INT_REQ;
return 0;
case MSB_SC_SEND_INT_REQ:
msb->state = MSB_SC_RECEIVE_INT_REQ;
if (msb_read_int_reg(msb, -1))
return 0;
/* fallthrough */
case MSB_SC_RECEIVE_INT_REQ:
intreg = mrq->data[0];
if (intreg & MEMSTICK_INT_CMDNAK)
return msb_exit_state_machine(msb, -EIO);
if (intreg & MEMSTICK_INT_ERR)
return msb_exit_state_machine(msb, -EBADMSG);
if (!(intreg & MEMSTICK_INT_CED)) {
msb->state = MSB_SC_SEND_INT_REQ;
goto again;
}
return msb_exit_state_machine(msb, 0);
}
BUG();
}
/* Small handler for card reset */
static int h_msb_reset(struct memstick_dev *card,
struct memstick_request **out_mrq)
{
u8 command = MS_CMD_RESET;
struct msb_data *msb = memstick_get_drvdata(card);
struct memstick_request *mrq = *out_mrq = &card->current_mrq;
if (mrq->error)
return msb_exit_state_machine(msb, mrq->error);
switch (msb->state) {
case MSB_RS_SEND:
memstick_init_req(mrq, MS_TPC_SET_CMD, &command, 1);
mrq->need_card_int = 0;
msb->state = MSB_RS_CONFIRM;
return 0;
case MSB_RS_CONFIRM:
return msb_exit_state_machine(msb, 0);
}
BUG();
}
/* This handler is used to do serial->parallel switch */
static int h_msb_parallel_switch(struct memstick_dev *card,
struct memstick_request **out_mrq)
{
struct msb_data *msb = memstick_get_drvdata(card);
struct memstick_request *mrq = *out_mrq = &card->current_mrq;
struct memstick_host *host = card->host;
if (mrq->error) {
dbg("parallel_switch: error");
msb->regs.param.system &= ~MEMSTICK_SYS_PAM;
return msb_exit_state_machine(msb, mrq->error);
}
switch (msb->state) {
case MSB_PS_SEND_SWITCH_COMMAND:
/* Set the parallel interface on memstick side */
msb->regs.param.system |= MEMSTICK_SYS_PAM;
if (!msb_write_regs(msb,
offsetof(struct ms_register, param),
1,
(unsigned char *)&msb->regs.param))
return 0;
msb->state = MSB_PS_SWICH_HOST;
return 0;
case MSB_PS_SWICH_HOST:
/* Set parallel interface on our side + send a dummy request
to see if card responds */
host->set_param(host, MEMSTICK_INTERFACE, MEMSTICK_PAR4);
memstick_init_req(mrq, MS_TPC_GET_INT, NULL, 1);
msb->state = MSB_PS_CONFIRM;
return 0;
case MSB_PS_CONFIRM:
return msb_exit_state_machine(msb, 0);
}
BUG();
}
static int msb_switch_to_parallel(struct msb_data *msb);
/* Reset the card, to guard against hw errors beeing treated as bad blocks */
static int msb_reset(struct msb_data *msb, bool full)
{
bool was_parallel = msb->regs.param.system & MEMSTICK_SYS_PAM;
struct memstick_dev *card = msb->card;
struct memstick_host *host = card->host;
int error;
/* Reset the card */
msb->regs.param.system = MEMSTICK_SYS_BAMD;
if (full) {
error = host->set_param(host,
MEMSTICK_POWER, MEMSTICK_POWER_OFF);
if (error)
goto out_error;
msb_invalidate_reg_window(msb);
error = host->set_param(host,
MEMSTICK_POWER, MEMSTICK_POWER_ON);
if (error)
goto out_error;
error = host->set_param(host,
MEMSTICK_INTERFACE, MEMSTICK_SERIAL);
if (error) {
out_error:
dbg("Failed to reset the host controller");
msb->read_only = true;
return -EFAULT;
}
}
error = msb_run_state_machine(msb, h_msb_reset);
if (error) {
dbg("Failed to reset the card");
msb->read_only = true;
return -ENODEV;
}
/* Set parallel mode */
if (was_parallel)
msb_switch_to_parallel(msb);
return 0;
}
/* Attempts to switch interface to parallel mode */
static int msb_switch_to_parallel(struct msb_data *msb)
{
int error;
error = msb_run_state_machine(msb, h_msb_parallel_switch);
if (error) {
pr_err("Switch to parallel failed");
msb->regs.param.system &= ~MEMSTICK_SYS_PAM;
msb_reset(msb, true);
return -EFAULT;
}
msb->caps |= MEMSTICK_CAP_AUTO_GET_INT;
return 0;
}
/* Changes overwrite flag on a page */
static int msb_set_overwrite_flag(struct msb_data *msb,
u16 pba, u8 page, u8 flag)
{
if (msb->read_only)
return -EROFS;
msb->regs.param.block_address = cpu_to_be16(pba);
msb->regs.param.page_address = page;
msb->regs.param.cp = MEMSTICK_CP_OVERWRITE;
msb->regs.extra_data.overwrite_flag = flag;
msb->command_value = MS_CMD_BLOCK_WRITE;
msb->command_need_oob = true;
dbg_verbose("changing overwrite flag to %02x for sector %d, page %d",
flag, pba, page);
return msb_run_state_machine(msb, h_msb_send_command);
}
static int msb_mark_bad(struct msb_data *msb, int pba)
{
pr_notice("marking pba %d as bad", pba);
msb_reset(msb, true);
return msb_set_overwrite_flag(
msb, pba, 0, 0xFF & ~MEMSTICK_OVERWRITE_BKST);
}
static int msb_mark_page_bad(struct msb_data *msb, int pba, int page)
{
dbg("marking page %d of pba %d as bad", page, pba);
msb_reset(msb, true);
return msb_set_overwrite_flag(msb,
pba, page, ~MEMSTICK_OVERWRITE_PGST0);
}
/* Erases one physical block */
static int msb_erase_block(struct msb_data *msb, u16 pba)
{
int error, try;
if (msb->read_only)
return -EROFS;
dbg_verbose("erasing pba %d", pba);
for (try = 1; try < 3; try++) {
msb->regs.param.block_address = cpu_to_be16(pba);
msb->regs.param.page_address = 0;
msb->regs.param.cp = MEMSTICK_CP_BLOCK;
msb->command_value = MS_CMD_BLOCK_ERASE;
msb->command_need_oob = false;
error = msb_run_state_machine(msb, h_msb_send_command);
if (!error || msb_reset(msb, true))
break;
}
if (error) {
pr_err("erase failed, marking pba %d as bad", pba);
msb_mark_bad(msb, pba);
}
dbg_verbose("erase success, marking pba %d as unused", pba);
msb_mark_block_unused(msb, pba);
__set_bit(pba, msb->erased_blocks_bitmap);
return error;
}
/* Reads one page from device */
static int msb_read_page(struct msb_data *msb,
u16 pba, u8 page, struct ms_extra_data_register *extra,
struct scatterlist *sg, int offset)
{
int try, error;
if (pba == MS_BLOCK_INVALID) {
unsigned long flags;
struct sg_mapping_iter miter;
size_t len = msb->page_size;
dbg_verbose("read unmapped sector. returning 0xFF");
local_irq_save(flags);
sg_miter_start(&miter, sg, sg_nents(sg),
SG_MITER_ATOMIC | SG_MITER_TO_SG);
while (sg_miter_next(&miter) && len > 0) {
int chunklen;
if (offset && offset >= miter.length) {
offset -= miter.length;
continue;
}
chunklen = min(miter.length - offset, len);
memset(miter.addr + offset, 0xFF, chunklen);
len -= chunklen;
offset = 0;
}
sg_miter_stop(&miter);
local_irq_restore(flags);
if (offset)
return -EFAULT;
if (extra)
memset(extra, 0xFF, sizeof(*extra));
return 0;
}
if (pba >= msb->block_count) {
pr_err("BUG: attempt to read beyond the end of the card at pba %d", pba);
return -EINVAL;
}
for (try = 1; try < 3; try++) {
msb->regs.param.block_address = cpu_to_be16(pba);
msb->regs.param.page_address = page;
msb->regs.param.cp = MEMSTICK_CP_PAGE;
msb->current_sg = sg;
msb->current_sg_offset = offset;
error = msb_run_state_machine(msb, h_msb_read_page);
if (error == -EUCLEAN) {
pr_notice("correctable error on pba %d, page %d",
pba, page);
error = 0;
}
if (!error && extra)
*extra = msb->regs.extra_data;
if (!error || msb_reset(msb, true))
break;
}
/* Mark bad pages */
if (error == -EBADMSG) {
pr_err("uncorrectable error on read of pba %d, page %d",
pba, page);
if (msb->regs.extra_data.overwrite_flag &
MEMSTICK_OVERWRITE_PGST0)
msb_mark_page_bad(msb, pba, page);
return -EBADMSG;
}
if (error)
pr_err("read of pba %d, page %d failed with error %d",
pba, page, error);
return error;
}
/* Reads oob of page only */
static int msb_read_oob(struct msb_data *msb, u16 pba, u16 page,
struct ms_extra_data_register *extra)
{
int error;
BUG_ON(!extra);
msb->regs.param.block_address = cpu_to_be16(pba);
msb->regs.param.page_address = page;
msb->regs.param.cp = MEMSTICK_CP_EXTRA;
if (pba > msb->block_count) {
pr_err("BUG: attempt to read beyond the end of card at pba %d", pba);
return -EINVAL;
}
error = msb_run_state_machine(msb, h_msb_read_page);
*extra = msb->regs.extra_data;
if (error == -EUCLEAN) {
pr_notice("correctable error on pba %d, page %d",
pba, page);
return 0;
}
return error;
}
/* Reads a block and compares it with data contained in scatterlist orig_sg */
static int msb_verify_block(struct msb_data *msb, u16 pba,
struct scatterlist *orig_sg, int offset)
{
struct scatterlist sg;
int page = 0, error;
sg_init_one(&sg, msb->block_buffer, msb->block_size);
while (page < msb->pages_in_block) {
error = msb_read_page(msb, pba, page,
NULL, &sg, page * msb->page_size);
if (error)
return error;
page++;
}
if (msb_sg_compare_to_buffer(orig_sg, offset,
msb->block_buffer, msb->block_size))
return -EIO;
return 0;
}
/* Writes exectly one block + oob */
static int msb_write_block(struct msb_data *msb,