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gcn-sd.c
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gcn-sd.c
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/*
* drivers/block/gcn-sd.c
*
* MMC/SD card block driver for the Nintendo GameCube/Wii
* Copyright (C) 2004-2009 The GameCube Linux Team
* Copyright (C) 2004,2005 Rob Reylink
* Copyright (C) 2005 Todd Jeffreys
* Copyright (C) 2005,2006,2007,2008,2009 Albert Herranz
* Copyleft (C) 2012, Gerrit Pannek
*
* 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 is a block device driver for the Nintendo SD Card Adapter (DOL-019)
* and compatible hardware.
* The driver has been tested with SPI-enabled MMC cards and SD cards.
*
* The following table shows the device major and minors needed to access
* MMC/SD cards:
*
* +------+-------------+-------+-------+
* | Slot | Target | Major | Minor |
* +======+=============+=======+=======+
* | A | disk | 61 | 0 |
* | A | partition 1 | 61 | 1 |
* | A | partition 2 | 61 | 2 |
* | A | partition 3 | 61 | 3 |
* | A | partition 4 | 61 | 4 |
* | A | partition 5 | 61 | 5 |
* | A | partition 6 | 61 | 6 |
* | A | partition 7 | 61 | 7 |
* +------+-------------+-------+-------+
* | B | disk | 61 | 8 |
* | B | partition 1 | 61 | 9 |
* | B | partition 2 | 61 | 10 |
* | B | partition 3 | 61 | 11 |
* | B | partition 4 | 61 | 12 |
* | B | partition 5 | 61 | 13 |
* | B | partition 6 | 61 | 14 |
* | B | partition 7 | 61 | 15 |
* +------+-------------+-------+-------+
*
* For example, run "mknod /dev/gcnsdb1 b 61 9" to create a device file
* to access the 1st partition on the card inserted in memcard slot B.
*
*/
#define SD_DEBUG
#include <linux/blkdev.h>
#include <linux/crc-ccitt.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/major.h>
#include <linux/module.h>
#include <linux/slab.h>
/*
* The existing Linux MMC layer does not support SPI operation yet.
* Anyway, we try to recycle here some common code.
*/
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include <linux/exi.h>
#define DRV_MODULE_NAME "gcn-sd"
#define DRV_DESCRIPTION "MMC/SD/SDHC card block driver for the Nintendo GameCube/Wii"
#define DRV_AUTHOR "Rob Reylink, " \
"Todd Jeffreys, " \
"Albert Herranz" \
"Gerrit Pannek"
static char sd_driver_version[] = "4.2";
#define sd_printk(level, format, arg...) \
printk(level DRV_MODULE_NAME ": " format , ## arg)
#ifdef SD_DEBUG
# define DBG(fmt, args...) \
printk(KERN_ERR "%s: " fmt, __func__ , ## args)
#else
# define DBG(fmt, args...)
#endif
/*
*
* EXI related definitions.
*/
#define SD_SLOTA_CHANNEL 0 /* EXI0xxx */
#define SD_SLOTA_DEVICE 0 /* chip select, EXI0CSB0 */
#define SD_SLOTB_CHANNEL 1 /* EXI1xxx */
#define SD_SLOTB_DEVICE 0 /* chip select, EXI1CSB0 */
#define SD_SPI_CLK 16000000
#define SD_SPI_CLK_IDX EXI_CLK_16MHZ
/*
*
* MMC/SD related definitions.
*/
/* cycles in 8 clock units */
#define SD_IDLE_CYCLES 80
#define SD_FINISH_CYCLES 8
/* several times in 8 clock units */
#define MMC_SPI_N_CR 8 /* card response time */
/* data start and stop tokens */
#define MMC_SPI_TOKEN_START_SINGLE_BLOCK_READ 0xfe
#define MMC_SPI_TOKEN_START_MULTIPLE_BLOCK_READ 0xfe
#define MMC_SPI_TOKEN_START_SINGLE_BLOCK_WRITE 0xfe
#define MMC_SPI_TOKEN_START_MULTIPLE_BLOCK_WRITE 0xfc
#define MMC_SPI_TOKEN_STOP_MULTIPLE_BLOCK_WRITE 0xfd
/* data response */
#define DR_SPI_MASK 0x1f
#define DR_SPI_DATA_ACCEPTED 0x05
#define DR_SPI_DATA_REJECTED_CRC_ERROR 0x0b
#define DR_SPI_DATA_REJECTED_WRITE_ERROR 0x0d
/* this is still a missing command in the current MMC framework ... */
#define MMC_READ_OCR 58
/*
* OCR Bit positions to 10s of Vdd mV.
*/
static const unsigned short mmc_ocr_bit_to_vdd[] = {
150, 155, 160, 165, 170, 180, 190, 200,
210, 220, 230, 240, 250, 260, 270, 280,
290, 300, 310, 320, 330, 340, 350, 360
};
static const unsigned int tran_exp[] = {
10000, 100000, 1000000, 10000000,
0, 0, 0, 0
};
static const unsigned char tran_mant[] = {
0, 10, 12, 13, 15, 20, 25, 30,
35, 40, 45, 50, 55, 60, 70, 80,
};
static const unsigned int tacc_exp[] = {
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
};
static const unsigned int tacc_mant[] = {
0, 10, 12, 13, 15, 20, 25, 30,
35, 40, 45, 50, 55, 60, 70, 80,
};
unsigned short is_sdhc = 0;
/*
* Driver settings.
*/
#define MMC_SHIFT 3 /* 8 partitions */
#define SD_MAJOR 61
#define SD_NAME "gcnsd"
#define KERNEL_SECTOR_SHIFT 9
#define KERNEL_SECTOR_SIZE (1 << KERNEL_SECTOR_SHIFT) /*512 */
enum {
__SD_MEDIA_CHANGED = 0,
__SD_BAD_CARD,
};
/*
* Raw MMC/SD command.
*/
struct sd_command {
u8 cmd;
u32 arg;
u8 crc;
} __attribute__ ((__packed__)); /* do not add padding, please */
/*
* MMC/SD host.
*
* We have one host for each memory card slot. And a host can only drive a
* single card each time.
*/
struct sd_host {
spinlock_t lock;
int refcnt;
unsigned long flags;
#define SD_MEDIA_CHANGED (1<<__SD_MEDIA_CHANGED)
#define SD_BAD_CARD (1<<__SD_BAD_CARD)
/* card related info */
struct mmc_card card;
/* timeouts in 8 clock cycles */
unsigned long read_timeout;
unsigned long write_timeout;
/* operations condition register */
u32 ocr_avail; /* just 3.3V for the GameCube */
u32 ocr;
/* last card response */
u8 resp;
/* frequency */
unsigned int clock;
u8 exi_clock;
/* command buffer */
struct sd_command cmd;
spinlock_t queue_lock;
struct request_queue *queue;
struct gendisk *disk;
struct task_struct *io_thread;
struct mutex io_mutex;
struct exi_device *exi_device;
};
static void sd_kill(struct sd_host *host);
/*
* This takes care of setting the global variable to check if it's
* a SDHC-Card or not
*/
static void sd_card_set_type(short value)
{
is_sdhc = value;
}
static int sd_card_is_sdhc(void)
{
return is_sdhc;
}
static void sd_card_set_bad(struct sd_host *host)
{
set_bit(__SD_BAD_CARD, &host->flags);
}
static int sd_card_is_bad(struct sd_host *host)
{
return test_bit(__SD_BAD_CARD, &host->flags);
}
/*
*
* MMC/SD data structures manipulation.
*/
/*
* FIXME: use a faster method (table)
* (the in-kernel crc 16 (ccitt crc) tables seem not compatible with us)
*/
static u16 crc_xmodem_update(u16 crc, u8 data)
{
int i;
crc = crc ^ ((u16) data << 8);
for (i = 0; i < 8; i++) {
if (crc & 0x8000)
crc = (crc << 1) ^ 0x1021;
else
crc <<= 1;
}
return crc;
}
#define UNSTUFF_BITS(resp, start, size) \
({ \
const int __size = size; \
const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
const int __off = 3 - ((start) / 32); \
const int __shft = (start) & 31; \
u32 __res; \
\
__res = resp[__off] >> __shft; \
if (__size + __shft > 32) \
__res |= resp[__off-1] << ((32 - __shft) % 32); \
__res & __mask; \
})
/*
* Given the decoded CSD structure, decode the raw CID to our CID structure.
*/
static void mmc_decode_cid(struct mmc_card *card)
{
u32 *resp = card->raw_cid;
memset(&card->cid, 0, sizeof(struct mmc_cid));
if (mmc_card_sd(card)) {
card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
card->cid.year = UNSTUFF_BITS(resp, 12, 8);
card->cid.month = UNSTUFF_BITS(resp, 8, 4);
card->cid.year += 2000;
} else {
/*
* The selection of the format here is guesswork based upon
* information people have sent to date.
*/
switch (card->csd.mmca_vsn) {
case 0: /* MMC v1.0 - v1.2 */
case 1: /* MMC v1.4 */
card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
card->cid.month = UNSTUFF_BITS(resp, 12, 4);
card->cid.year = UNSTUFF_BITS(resp, 8, 4);
card->cid.year += 1997;
break;
case 2: /* MMC v2.0 - v2.2 */
case 3: /* MMC v3.1 - v3.3 */
card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
card->cid.month = UNSTUFF_BITS(resp, 12, 4);
card->cid.year = UNSTUFF_BITS(resp, 8, 4);
card->cid.year += 1997;
break;
default:
sd_printk(KERN_ERR, "card has unknown MMCA"
" version %d\n", card->csd.mmca_vsn);
break;
}
}
}
/*
* Given a 128-bit response, decode to our card CSD structure.
*/
static void mmc_decode_csd(struct mmc_card *card)
{
struct mmc_csd *csd = &card->csd;
unsigned int e, m, csd_struct;
u32 *resp = card->raw_csd;
/*
* We only understand CSD structure v1.0, v1.1 and v2.
* v2 has extra information in bits 15, 11 and 10.
*/
csd_struct = UNSTUFF_BITS(resp, 126, 2);
switch (csd_struct) {
case 0:
m = UNSTUFF_BITS(resp, 115, 4);
e = UNSTUFF_BITS(resp, 112, 3);
csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
m = UNSTUFF_BITS(resp, 99, 4);
e = UNSTUFF_BITS(resp, 96, 3);
csd->max_dtr = tran_exp[e] * tran_mant[m];
csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
e = UNSTUFF_BITS(resp, 47, 3);
m = UNSTUFF_BITS(resp, 62, 12);
csd->capacity = (1 + m) << (e + 2);
csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
break;
case 1:
/*
* This is a block-addressed SDHC card. Most
* interesting fields are unused and have fixed
* values. To avoid getting tripped by buggy cards,
* we assume those fixed values ourselves.
*/
mmc_card_set_blockaddr(card);
csd->tacc_ns = 0; /* Unused */
csd->tacc_clks = 0; /* Unused */
m = UNSTUFF_BITS(resp, 99, 4);
e = UNSTUFF_BITS(resp, 96, 3);
csd->max_dtr = tran_exp[e] * tran_mant[m];
csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
m = UNSTUFF_BITS(resp, 48, 22);
csd->capacity = (1 + m) << 10;
csd->read_blkbits = 9;
csd->read_partial = 0;
csd->write_misalign = 0;
csd->read_misalign = 0;
csd->r2w_factor = 4; /* Unused */
csd->write_blkbits = 9;
csd->write_partial = 0;
sd_card_set_type(1);
break;
default:
printk("%s: unrecognised CSD structure version %d\n",
mmc_hostname(card->host), csd_struct);
return;
}
}
#if 0
static void sd_print_cid(struct mmc_cid *cid)
{
sd_printk(KERN_INFO,
"manfid = %d\n"
"oemid = %d\n"
"prod_name = %s\n"
"hwrev = %d\n"
"fwrev = %d\n"
"serial = %08x\n"
"year = %d\n"
"month = %d\n",
cid->manfid,
cid->oemid,
cid->prod_name,
cid->hwrev, cid->fwrev, cid->serial, cid->year, cid->month);
}
#endif
/* */
static inline unsigned int ms_to_cycles(unsigned int ms, unsigned int clock)
{
return ms * (clock / 1000);
}
/* */
static unsigned int sd_set_clock(struct sd_host *host, unsigned int clock)
{
if (clock >= 32000000) {
host->clock = 32000000;
host->exi_clock = EXI_CLK_32MHZ;
} else if (clock >= 16000000) {
host->clock = 16000000;
host->exi_clock = EXI_CLK_16MHZ;
} else if (clock >= 8000000) {
host->clock = 8000000;
host->exi_clock = EXI_CLK_8MHZ;
} else if (clock >= 4000000) {
host->clock = 4000000;
host->exi_clock = EXI_CLK_4MHZ;
} else if (clock >= 2000000) {
host->clock = 2000000;
host->exi_clock = EXI_CLK_2MHZ;
} else {
host->clock = 1000000;
host->exi_clock = EXI_CLK_1MHZ;
}
return host->clock;
}
/* */
static void sd_calc_timeouts(struct sd_host *host)
{
/*
* FIXME: calculate timeouts from card information
* (use safe defaults for now)
*/
host->read_timeout = ms_to_cycles(100, host->clock);
host->write_timeout = ms_to_cycles(250, host->clock);
}
/*
*
* SPI I/O support routines, including some handy SPI to EXI language
* translations.
*/
/* */
static inline void spi_cs_low(struct sd_host *host)
{
exi_dev_take(host->exi_device);
exi_dev_select(host->exi_device);
}
/* */
static inline void spi_cs_high(struct sd_host *host)
{
exi_dev_deselect(host->exi_device);
exi_dev_give(host->exi_device);
}
/* */
static inline void spi_write(struct sd_host *host, void *data, size_t len)
{
exi_dev_write(host->exi_device, data, len);
}
/* */
static inline void spi_read(struct sd_host *host, void *data, size_t len)
{
/*
* Houston, we have a problem.
*
* The EXI hardware implementation seems to use a shift register which
* outputs data from the MSB to the MOSI line and inputs data from
* the MISO line into the LSB.
* When a read operation is performed, data from the MISO line
* is entered into the shift register LSB as expected. But also the
* data already present in the shift register is sent out through the
* MOSI line from the MSB.
* This is in fact the "feature" that enabled tmbinc to dump the IPL.
*
* When interfacing with SD cards, this causes us a serious problem.
*
* We are required to send all ones (1s) while reading data from
* the SD card. Otherwise, the card can interpret the data sent as
* commands (if they start with the bit pattern 01 for example).
*
* If we use the EXI immediate mode transfer, we can workaround the
* situation by writing all 1s to the DATA register before reading
* (this is indeed automatically done by the EXI layer).
* But we simply can't do that when using EXI DMA transfers (these
* kind of transfers do not allow bidirectional operation).
*
* Given that no EXI DMA read transfers seem reliable, we fallback
* to the "interrupt-driven" immediate mode of the EXI layer.
* This will help reducing CPU monopolization on large reads.
*
*/
exi_dev_transfer(host->exi_device, data, len, EXI_OP_READ, EXI_CMD_IDI);
}
/* cycles are expressed in 8 clock cycles */
static void spi_burn_cycles(struct sd_host *host, int cycles)
{
u8 d;
while (cycles-- > 0) {
d = 0xff;
spi_write(host, &d, sizeof(d));
}
}
/* cycles are expressed in 8 clock cycles */
static int spi_wait_for_resp(struct sd_host *host,
u8 resp, u8 resp_mask, unsigned long cycles)
{
u8 data;
while (cycles-- > 0) {
spi_read(host, &data, sizeof(data));
if ((data & resp_mask) == resp) {
host->resp = data;
return data;
}
}
return -ENODATA;
}
/*
*
*/
static int sd_read_data(struct sd_host *host, void *data, size_t len, int token)
{
int retval = 0;
if (token) {
retval = spi_wait_for_resp(host, token, 0xff,
host->read_timeout);
if (retval < 0)
goto out;
}
spi_read(host, data, len);
retval = 0;
out:
return retval;
}
/*
*
*/
static int sd_write_data(struct sd_host *host, void *data, size_t len,
int token)
{
u16 crc;
u8 t, *d;
size_t l;
int retval = 0;
/* FIXME, rewrite this a bit */
{
crc = 0;
d = data;
l = len;
while (l-- > 0)
crc = crc_xmodem_update(crc, *d++);
}
/* send the write block token */
t = token;
spi_write(host, &t, sizeof(t));
/* send the data */
spi_write(host, data, len);
/* send the crc */
spi_write(host, &crc, sizeof(crc));
/* get the card data response */
retval = spi_wait_for_resp(host, 0x01, 0x11, host->write_timeout);
if (retval < 0)
goto out;
if ((retval & DR_SPI_MASK) != DR_SPI_DATA_ACCEPTED) {
DBG("data response=%02x\n", retval);
retval = -EIO;
goto out;
}
/* wait for the busy signal to clear */
retval = spi_wait_for_resp(host, 0xff, 0xff, host->write_timeout);
if (retval < 0)
goto out;
retval = 0;
out:
return retval;
}
/*
*
* MMC/SD command transactions related routines.
*/
/* */
static inline void sd_cmd(struct sd_command *cmd, u8 opcode, u32 arg)
{
cmd->cmd = 0x40 | opcode;
cmd->arg = arg;
cmd->crc = 0x01; /* FIXME, crc is not currently used */
}
static inline void sd_cmd_crc(struct sd_command *cmd, u8 opcode, u32 arg, u8 crc)
{
cmd->cmd = 0x40 + opcode;
cmd->arg = arg;
cmd->crc = crc;
}
/* */
static inline void sd_cmd_go_idle_state(struct sd_command *cmd)
{
cmd->cmd = 0x40;
cmd->arg = 0;
cmd->crc = 0x95;
}
/* */
static inline void sd_debug_print_cmd(struct sd_command *cmd)
{
DBG("cmd = %d, arg = %08x, crc = %02x\n",
cmd->cmd & ~0x40, cmd->arg, cmd->crc);
}
/*
*
*/
static int sd_start_command(struct sd_host *host, struct sd_command *cmd)
{
int retval = 0;
/* select the card by driving CS low */
spi_cs_low(host);
/* send the command through the MOSI line */
spi_write(host, cmd, sizeof(*cmd));
/*
* Wait for the card response.
* Card responses come in the MISO line and have the most significant
* bit cleared.
*/
retval = spi_wait_for_resp(host, 0x00, 0x80, MMC_SPI_N_CR);
if (retval > 0 && !(retval & 0x01) && cmd->cmd != 0x40)
DBG("command = %d, response = 0x%02x\n", cmd->cmd & ~0x40,
retval);
return retval;
}
/*
*
*/
static void sd_end_command(struct sd_host *host)
{
/* wait 8 clock cycles as dictated by the specification */
spi_burn_cycles(host, SD_FINISH_CYCLES);
/* deselect the card by driving CS high */
spi_cs_high(host);
}
/*
*
*/
static int sd_run_no_data_command(struct sd_host *host, struct sd_command *cmd)
{
int retval;
/* send command, wait for response, and burn extra cycles */
retval = sd_start_command(host, cmd);
sd_end_command(host);
return retval;
}
/*
*
*/
static int sd_generic_read(struct sd_host *host,
u8 opcode, u32 arg,
void *data, size_t len, int token)
{
struct sd_command *cmd = &host->cmd;
u16 crc, calc_crc = 0xffff;
u8 *d;
size_t l;
int retval;
/* build raw command */
sd_cmd(cmd, opcode, arg);
/* select card, send command and wait for response */
retval = sd_start_command(host, cmd);
if (retval < 0)
goto out;
if (retval != 0x00) {
retval = -EIO;
goto out;
}
/* wait for read token, then read data */
retval = sd_read_data(host, data, len, token);
if (retval < 0)
goto out;
/* read trailing crc */
spi_read(host, &crc, sizeof(crc));
retval = 0;
/* FIXME, rewrite this a bit */
{
calc_crc = 0;
d = data;
l = len;
while (l-- > 0)
calc_crc = crc_xmodem_update(calc_crc, *d++);
if (calc_crc != crc)
retval = -EIO;
}
out:
/* burn extra cycles and deselect card */
sd_end_command(host);
if (retval < 0) {
DBG("read, offset=%u, len=%d\n", arg, len);
DBG("crc=%04x, calc_crc=%04x, %s\n", crc, calc_crc,
(retval < 0) ? "failed" : "ok");
}
return retval;
}
/*
*
*/
static int sd_generic_write(struct sd_host *host,
u8 opcode, u32 arg,
void *data, size_t len, int token)
{
struct sd_command *cmd = &host->cmd;
int retval;
/* build raw command */
sd_cmd(cmd, opcode, arg);
/* select card, send command and wait for response */
retval = sd_start_command(host, cmd);
if (retval < 0)
goto out;
if (retval != 0x00) {
retval = -EIO;
goto out;
}
/* send data token, data and crc, get data response */
retval = sd_write_data(host, data, len, token);
if (retval < 0)
goto out;
retval = 0;
out:
/* burn extra cycles and deselect card */
sd_end_command(host);
if (retval < 0)
DBG("write, offset=%d, len=%d\n", arg, len);
return retval;
}
/*
*
*/
static int sd_read_ocr(struct sd_host *host)
{
struct sd_command *cmd = &host->cmd;
int retval;
memset(&host->ocr, 0, sizeof(host->ocr));
sd_cmd(cmd, MMC_READ_OCR, 0);
/* select card, send command and wait for response */
retval = sd_start_command(host, cmd);
if (retval < 0)
goto out;
/* the OCR contents come immediately after the card response */
spi_read(host, &host->ocr, sizeof(host->ocr));
retval = 0;
out:
/* burn extra cycles and deselect card */
sd_end_command(host);
return retval;
}
/*
*
*/
static inline int sd_read_csd(struct sd_host *host)
{
memset(&host->card.raw_csd, 0, sizeof(host->card.raw_csd));
return sd_generic_read(host, MMC_SEND_CSD, 0,
&host->card.raw_csd,
sizeof(host->card.raw_csd),
MMC_SPI_TOKEN_START_SINGLE_BLOCK_READ);
}
/*
*
*/
static inline int sd_read_cid(struct sd_host *host)
{
memset(&host->card.raw_cid, 0, sizeof(host->card.raw_cid));
return sd_generic_read(host, MMC_SEND_CID, 0,
&host->card.raw_cid,
sizeof(host->card.raw_cid),
MMC_SPI_TOKEN_START_SINGLE_BLOCK_READ);
}
/*
*
*/
static inline int sd_read_single_block(struct sd_host *host,
unsigned long start,
void *data, size_t len)
{
int retval;
int attempts = 3;
if (test_bit(__SD_MEDIA_CHANGED, &host->flags))
attempts = 1;
while (attempts > 0) {
retval = sd_generic_read(host, MMC_READ_SINGLE_BLOCK, start,
data, len,
MMC_SPI_TOKEN_START_SINGLE_BLOCK_READ);
if (retval >= 0)
break;
attempts--;
DBG("start=%lu, data=%p, len=%d, retval = %d\n", start, data,
len, retval);
}
return retval;
}
/*
*
*/
static inline int sd_write_single_block(struct sd_host *host,
unsigned long start,
void *data, size_t len)
{
int retval;
retval = sd_generic_write(host, MMC_WRITE_BLOCK, start,
data, len,
MMC_SPI_TOKEN_START_SINGLE_BLOCK_WRITE);
if (retval < 0)
DBG("start=%lu, data=%p, len=%d, retval = %d\n", start, data,
len, retval);
return retval;
}
/*
*
*/
static int sd_reset_sequence(struct sd_host *host)
{
struct sd_command *cmd = &host->cmd;
u8 d;
int i;
int retval = 0;
u32 cmd_ret = 0;
host->card.state = 0;
/*
* Wait at least 80 dummy clock cycles with the card deselected
* and with the MOSI line continuously high.
*/
exi_dev_take(host->exi_device);
exi_dev_deselect(host->exi_device);
for (i = 0; i < SD_IDLE_CYCLES; i++) {
d = 0xff;
exi_dev_write(host->exi_device, &d, sizeof(d));
}
exi_dev_give(host->exi_device);
/*
* Send a CMD0, card must ack with "idle state" (0x01).
* This puts the card into SPI mode and soft resets it.
* CRC checking is disabled by default.
*/
for (i = 0; i < 255; i++) {
/* CMD0 */
sd_cmd_go_idle_state(cmd);
retval = sd_run_no_data_command(host, cmd);
if (retval < 0) {
retval = -ENODEV;
goto out;
}
if (retval == R1_SPI_IDLE) {
break;
}