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b1f517ed43
qemu/hw/sd.c
Peter Maydell b1f517ed43 hw/sd.c: Handle CRC and locked-card errors in normal code path 
Handle returning CRC and locked-card errors in the same code path
we use for other responses. This makes no difference in behaviour
but means that these error responses will be printed by the debug
logging code.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
2011-12-21 05:01:35 +01:00

1693 lines
46 KiB
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/*
* SD Memory Card emulation as defined in the "SD Memory Card Physical
* layer specification, Version 1.10."
*
* Copyright (c) 2006 Andrzej Zaborowski <balrog@zabor.org>
* Copyright (c) 2007 CodeSourcery
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "hw.h"
#include "block.h"
#include "sd.h"
//#define DEBUG_SD 1
#ifdef DEBUG_SD
#define DPRINTF(fmt, ...) \
do { fprintf(stderr, "SD: " fmt , ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do {} while(0)
#endif
typedef enum {
sd_r0 = 0, /* no response */
sd_r1, /* normal response command */
sd_r2_i, /* CID register */
sd_r2_s, /* CSD register */
sd_r3, /* OCR register */
sd_r6 = 6, /* Published RCA response */
sd_r7, /* Operating voltage */
sd_r1b = -1,
sd_illegal = -2,
} sd_rsp_type_t;
struct SDState {
enum {
sd_inactive,
sd_card_identification_mode,
sd_data_transfer_mode,
} mode;
enum {
sd_inactive_state = -1,
sd_idle_state = 0,
sd_ready_state,
sd_identification_state,
sd_standby_state,
sd_transfer_state,
sd_sendingdata_state,
sd_receivingdata_state,
sd_programming_state,
sd_disconnect_state,
} state;
uint32_t ocr;
uint8_t scr[8];
uint8_t cid[16];
uint8_t csd[16];
uint16_t rca;
uint32_t card_status;
uint8_t sd_status[64];
uint32_t vhs;
int wp_switch;
int *wp_groups;
uint64_t size;
int blk_len;
uint32_t erase_start;
uint32_t erase_end;
uint8_t pwd[16];
int pwd_len;
int function_group[6];
int spi;
int current_cmd;
int blk_written;
uint64_t data_start;
uint32_t data_offset;
uint8_t data[512];
qemu_irq readonly_cb;
qemu_irq inserted_cb;
BlockDriverState *bdrv;
uint8_t *buf;
int enable;
};
static void sd_set_status(SDState *sd)
{
switch (sd->state) {
case sd_inactive_state:
sd->mode = sd_inactive;
break;
case sd_idle_state:
case sd_ready_state:
case sd_identification_state:
sd->mode = sd_card_identification_mode;
break;
case sd_standby_state:
case sd_transfer_state:
case sd_sendingdata_state:
case sd_receivingdata_state:
case sd_programming_state:
case sd_disconnect_state:
sd->mode = sd_data_transfer_mode;
break;
}
sd->card_status &= ~CURRENT_STATE;
sd->card_status |= sd->state << 9;
}
static const sd_cmd_type_t sd_cmd_type[64] = {
sd_bc, sd_none, sd_bcr, sd_bcr, sd_none, sd_none, sd_none, sd_ac,
sd_bcr, sd_ac, sd_ac, sd_adtc, sd_ac, sd_ac, sd_none, sd_ac,
sd_ac, sd_adtc, sd_adtc, sd_none, sd_none, sd_none, sd_none, sd_none,
sd_adtc, sd_adtc, sd_adtc, sd_adtc, sd_ac, sd_ac, sd_adtc, sd_none,
sd_ac, sd_ac, sd_none, sd_none, sd_none, sd_none, sd_ac, sd_none,
sd_none, sd_none, sd_bc, sd_none, sd_none, sd_none, sd_none, sd_none,
sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_ac,
sd_adtc, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none,
};
static const sd_cmd_type_t sd_acmd_type[64] = {
sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_ac, sd_none,
sd_none, sd_none, sd_none, sd_none, sd_none, sd_adtc, sd_none, sd_none,
sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_adtc, sd_ac,
sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none,
sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none,
sd_none, sd_bcr, sd_ac, sd_none, sd_none, sd_none, sd_none, sd_none,
sd_none, sd_none, sd_none, sd_adtc, sd_none, sd_none, sd_none, sd_none,
sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none, sd_none,
};
static const int sd_cmd_class[64] = {
0, 0, 0, 0, 0, 9, 10, 0, 0, 0, 0, 1, 0, 0, 0, 0,
2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 6, 6, 6, 6,
5, 5, 10, 10, 10, 10, 5, 9, 9, 9, 7, 7, 7, 7, 7, 7,
7, 7, 10, 7, 9, 9, 9, 8, 8, 10, 8, 8, 8, 8, 8, 8,
};
static uint8_t sd_crc7(void *message, size_t width)
{
int i, bit;
uint8_t shift_reg = 0x00;
uint8_t *msg = (uint8_t *) message;
for (i = 0; i < width; i ++, msg ++)
for (bit = 7; bit >= 0; bit --) {
shift_reg <<= 1;
if ((shift_reg >> 7) ^ ((*msg >> bit) & 1))
shift_reg ^= 0x89;
}
return shift_reg;
}
static uint16_t sd_crc16(void *message, size_t width)
{
int i, bit;
uint16_t shift_reg = 0x0000;
uint16_t *msg = (uint16_t *) message;
width <<= 1;
for (i = 0; i < width; i ++, msg ++)
for (bit = 15; bit >= 0; bit --) {
shift_reg <<= 1;
if ((shift_reg >> 15) ^ ((*msg >> bit) & 1))
shift_reg ^= 0x1011;
}
return shift_reg;
}
static void sd_set_ocr(SDState *sd)
{
/* All voltages OK, card power-up OK, Standard Capacity SD Memory Card */
sd->ocr = 0x80ffff00;
}
static void sd_set_scr(SDState *sd)
{
sd->scr[0] = 0x00; /* SCR Structure */
sd->scr[1] = 0x2f; /* SD Security Support */
sd->scr[2] = 0x00;
sd->scr[3] = 0x00;
sd->scr[4] = 0x00;
sd->scr[5] = 0x00;
sd->scr[6] = 0x00;
sd->scr[7] = 0x00;
}
#define MID 0xaa
#define OID "XY"
#define PNM "QEMU!"
#define PRV 0x01
#define MDT_YR 2006
#define MDT_MON 2
static void sd_set_cid(SDState *sd)
{
sd->cid[0] = MID; /* Fake card manufacturer ID (MID) */
sd->cid[1] = OID[0]; /* OEM/Application ID (OID) */
sd->cid[2] = OID[1];
sd->cid[3] = PNM[0]; /* Fake product name (PNM) */
sd->cid[4] = PNM[1];
sd->cid[5] = PNM[2];
sd->cid[6] = PNM[3];
sd->cid[7] = PNM[4];
sd->cid[8] = PRV; /* Fake product revision (PRV) */
sd->cid[9] = 0xde; /* Fake serial number (PSN) */
sd->cid[10] = 0xad;
sd->cid[11] = 0xbe;
sd->cid[12] = 0xef;
sd->cid[13] = 0x00 | /* Manufacture date (MDT) */
((MDT_YR - 2000) / 10);
sd->cid[14] = ((MDT_YR % 10) << 4) | MDT_MON;
sd->cid[15] = (sd_crc7(sd->cid, 15) << 1) | 1;
}
#define HWBLOCK_SHIFT 9 /* 512 bytes */
#define SECTOR_SHIFT 5 /* 16 kilobytes */
#define WPGROUP_SHIFT 7 /* 2 megs */
#define CMULT_SHIFT 9 /* 512 times HWBLOCK_SIZE */
#define WPGROUP_SIZE (1 << (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT))
static const uint8_t sd_csd_rw_mask[16] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xfe,
};
static void sd_set_csd(SDState *sd, uint64_t size)
{
uint32_t csize = (size >> (CMULT_SHIFT + HWBLOCK_SHIFT)) - 1;
uint32_t sectsize = (1 << (SECTOR_SHIFT + 1)) - 1;
uint32_t wpsize = (1 << (WPGROUP_SHIFT + 1)) - 1;
if (size <= 0x40000000) { /* Standard Capacity SD */
sd->csd[0] = 0x00; /* CSD structure */
sd->csd[1] = 0x26; /* Data read access-time-1 */
sd->csd[2] = 0x00; /* Data read access-time-2 */
sd->csd[3] = 0x5a; /* Max. data transfer rate */
sd->csd[4] = 0x5f; /* Card Command Classes */
sd->csd[5] = 0x50 | /* Max. read data block length */
HWBLOCK_SHIFT;
sd->csd[6] = 0xe0 | /* Partial block for read allowed */
((csize >> 10) & 0x03);
sd->csd[7] = 0x00 | /* Device size */
((csize >> 2) & 0xff);
sd->csd[8] = 0x3f | /* Max. read current */
((csize << 6) & 0xc0);
sd->csd[9] = 0xfc | /* Max. write current */
((CMULT_SHIFT - 2) >> 1);
sd->csd[10] = 0x40 | /* Erase sector size */
(((CMULT_SHIFT - 2) << 7) & 0x80) | (sectsize >> 1);
sd->csd[11] = 0x00 | /* Write protect group size */
((sectsize << 7) & 0x80) | wpsize;
sd->csd[12] = 0x90 | /* Write speed factor */
(HWBLOCK_SHIFT >> 2);
sd->csd[13] = 0x20 | /* Max. write data block length */
((HWBLOCK_SHIFT << 6) & 0xc0);
sd->csd[14] = 0x00; /* File format group */
sd->csd[15] = (sd_crc7(sd->csd, 15) << 1) | 1;
} else { /* SDHC */
size /= 512 * 1024;
size -= 1;
sd->csd[0] = 0x40;
sd->csd[1] = 0x0e;
sd->csd[2] = 0x00;
sd->csd[3] = 0x32;
sd->csd[4] = 0x5b;
sd->csd[5] = 0x59;
sd->csd[6] = 0x00;
sd->csd[7] = (size >> 16) & 0xff;
sd->csd[8] = (size >> 8) & 0xff;
sd->csd[9] = (size & 0xff);
sd->csd[10] = 0x7f;
sd->csd[11] = 0x80;
sd->csd[12] = 0x0a;
sd->csd[13] = 0x40;
sd->csd[14] = 0x00;
sd->csd[15] = 0x00;
sd->ocr |= 1 << 30; /* High Capacity SD Memort Card */
}
}
static void sd_set_rca(SDState *sd)
{
sd->rca += 0x4567;
}
/* Card status bits, split by clear condition:
* A : According to the card current state
* B : Always related to the previous command
* C : Cleared by read
*/
#define CARD_STATUS_A 0x02004100
#define CARD_STATUS_B 0x00c01e00
#define CARD_STATUS_C 0xfd39a028
static void sd_set_cardstatus(SDState *sd)
{
sd->card_status = 0x00000100;
}
static void sd_set_sdstatus(SDState *sd)
{
memset(sd->sd_status, 0, 64);
}
static int sd_req_crc_validate(SDRequest *req)
{
uint8_t buffer[5];
buffer[0] = 0x40 | req->cmd;
buffer[1] = (req->arg >> 24) & 0xff;
buffer[2] = (req->arg >> 16) & 0xff;
buffer[3] = (req->arg >> 8) & 0xff;
buffer[4] = (req->arg >> 0) & 0xff;
return 0;
return sd_crc7(buffer, 5) != req->crc; /* TODO */
}
static void sd_response_r1_make(SDState *sd,
uint8_t *response, uint32_t last_status)
{
uint32_t mask = CARD_STATUS_B ^ ILLEGAL_COMMAND;
uint32_t status;
status = (sd->card_status & ~mask) | (last_status & mask);
sd->card_status &= ~CARD_STATUS_C | APP_CMD;
response[0] = (status >> 24) & 0xff;
response[1] = (status >> 16) & 0xff;
response[2] = (status >> 8) & 0xff;
response[3] = (status >> 0) & 0xff;
}
static void sd_response_r3_make(SDState *sd, uint8_t *response)
{
response[0] = (sd->ocr >> 24) & 0xff;
response[1] = (sd->ocr >> 16) & 0xff;
response[2] = (sd->ocr >> 8) & 0xff;
response[3] = (sd->ocr >> 0) & 0xff;
}
static void sd_response_r6_make(SDState *sd, uint8_t *response)
{
uint16_t arg;
uint16_t status;
arg = sd->rca;
status = ((sd->card_status >> 8) & 0xc000) |
((sd->card_status >> 6) & 0x2000) |
(sd->card_status & 0x1fff);
response[0] = (arg >> 8) & 0xff;
response[1] = arg & 0xff;
response[2] = (status >> 8) & 0xff;
response[3] = status & 0xff;
}
static void sd_response_r7_make(SDState *sd, uint8_t *response)
{
response[0] = (sd->vhs >> 24) & 0xff;
response[1] = (sd->vhs >> 16) & 0xff;
response[2] = (sd->vhs >> 8) & 0xff;
response[3] = (sd->vhs >> 0) & 0xff;
}
static void sd_reset(SDState *sd, BlockDriverState *bdrv)
{
uint64_t size;
uint64_t sect;
if (bdrv) {
bdrv_get_geometry(bdrv, &sect);
} else {
sect = 0;
}
size = sect << 9;
sect = (size >> (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT)) + 1;
sd->state = sd_idle_state;
sd->rca = 0x0000;
sd_set_ocr(sd);
sd_set_scr(sd);
sd_set_cid(sd);
sd_set_csd(sd, size);
sd_set_cardstatus(sd);
sd_set_sdstatus(sd);
sd->bdrv = bdrv;
if (sd->wp_groups)
g_free(sd->wp_groups);
sd->wp_switch = bdrv ? bdrv_is_read_only(bdrv) : 0;
sd->wp_groups = (int *) g_malloc0(sizeof(int) * sect);
memset(sd->function_group, 0, sizeof(int) * 6);
sd->erase_start = 0;
sd->erase_end = 0;
sd->size = size;
sd->blk_len = 0x200;
sd->pwd_len = 0;
}
static void sd_cardchange(void *opaque, bool load)
{
SDState *sd = opaque;
qemu_set_irq(sd->inserted_cb, bdrv_is_inserted(sd->bdrv));
if (bdrv_is_inserted(sd->bdrv)) {
sd_reset(sd, sd->bdrv);
qemu_set_irq(sd->readonly_cb, sd->wp_switch);
}
}
static const BlockDevOps sd_block_ops = {
.change_media_cb = sd_cardchange,
};
/* We do not model the chip select pin, so allow the board to select
whether card should be in SSI or MMC/SD mode. It is also up to the
board to ensure that ssi transfers only occur when the chip select
is asserted. */
SDState *sd_init(BlockDriverState *bs, int is_spi)
{
SDState *sd;
sd = (SDState *) g_malloc0(sizeof(SDState));
sd->buf = qemu_blockalign(bs, 512);
sd->spi = is_spi;
sd->enable = 1;
sd_reset(sd, bs);
if (sd->bdrv) {
bdrv_attach_dev_nofail(sd->bdrv, sd);
bdrv_set_dev_ops(sd->bdrv, &sd_block_ops, sd);
}
return sd;
}
void sd_set_cb(SDState *sd, qemu_irq readonly, qemu_irq insert)
{
sd->readonly_cb = readonly;
sd->inserted_cb = insert;
qemu_set_irq(readonly, sd->bdrv ? bdrv_is_read_only(sd->bdrv) : 0);
qemu_set_irq(insert, sd->bdrv ? bdrv_is_inserted(sd->bdrv) : 0);
}
static void sd_erase(SDState *sd)
{
int i, start, end;
if (!sd->erase_start || !sd->erase_end) {
sd->card_status |= ERASE_SEQ_ERROR;
return;
}
start = sd->erase_start >>
(HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT);
end = sd->erase_end >>
(HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT);
sd->erase_start = 0;
sd->erase_end = 0;
sd->csd[14] |= 0x40;
for (i = start; i <= end; i ++)
if (sd->wp_groups[i])
sd->card_status |= WP_ERASE_SKIP;
}
static uint32_t sd_wpbits(SDState *sd, uint64_t addr)
{
uint32_t i, wpnum;
uint32_t ret = 0;
wpnum = addr >> (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT);
for (i = 0; i < 32; i ++, wpnum ++, addr += WPGROUP_SIZE)
if (addr < sd->size && sd->wp_groups[wpnum])
ret |= (1 << i);
return ret;
}
static void sd_function_switch(SDState *sd, uint32_t arg)
{
int i, mode, new_func, crc;
mode = !!(arg & 0x80000000);
sd->data[0] = 0x00; /* Maximum current consumption */
sd->data[1] = 0x01;
sd->data[2] = 0x80; /* Supported group 6 functions */
sd->data[3] = 0x01;
sd->data[4] = 0x80; /* Supported group 5 functions */
sd->data[5] = 0x01;
sd->data[6] = 0x80; /* Supported group 4 functions */
sd->data[7] = 0x01;
sd->data[8] = 0x80; /* Supported group 3 functions */
sd->data[9] = 0x01;
sd->data[10] = 0x80; /* Supported group 2 functions */
sd->data[11] = 0x43;
sd->data[12] = 0x80; /* Supported group 1 functions */
sd->data[13] = 0x03;
for (i = 0; i < 6; i ++) {
new_func = (arg >> (i * 4)) & 0x0f;
if (mode && new_func != 0x0f)
sd->function_group[i] = new_func;
sd->data[14 + (i >> 1)] = new_func << ((i * 4) & 4);
}
memset(&sd->data[17], 0, 47);
crc = sd_crc16(sd->data, 64);
sd->data[65] = crc >> 8;
sd->data[66] = crc & 0xff;
}
static inline int sd_wp_addr(SDState *sd, uint32_t addr)
{
return sd->wp_groups[addr >>
(HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT)];
}
static void sd_lock_command(SDState *sd)
{
int erase, lock, clr_pwd, set_pwd, pwd_len;
erase = !!(sd->data[0] & 0x08);
lock = sd->data[0] & 0x04;
clr_pwd = sd->data[0] & 0x02;
set_pwd = sd->data[0] & 0x01;
if (sd->blk_len > 1)
pwd_len = sd->data[1];
else
pwd_len = 0;
if (erase) {
if (!(sd->card_status & CARD_IS_LOCKED) || sd->blk_len > 1 ||
set_pwd || clr_pwd || lock || sd->wp_switch ||
(sd->csd[14] & 0x20)) {
sd->card_status |= LOCK_UNLOCK_FAILED;
return;
}
memset(sd->wp_groups, 0, sizeof(int) * (sd->size >>
(HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT)));
sd->csd[14] &= ~0x10;
sd->card_status &= ~CARD_IS_LOCKED;
sd->pwd_len = 0;
/* Erasing the entire card here! */
fprintf(stderr, "SD: Card force-erased by CMD42\n");
return;
}
if (sd->blk_len < 2 + pwd_len ||
pwd_len <= sd->pwd_len ||
pwd_len > sd->pwd_len + 16) {
sd->card_status |= LOCK_UNLOCK_FAILED;
return;
}
if (sd->pwd_len && memcmp(sd->pwd, sd->data + 2, sd->pwd_len)) {
sd->card_status |= LOCK_UNLOCK_FAILED;
return;
}
pwd_len -= sd->pwd_len;
if ((pwd_len && !set_pwd) ||
(clr_pwd && (set_pwd || lock)) ||
(lock && !sd->pwd_len && !set_pwd) ||
(!set_pwd && !clr_pwd &&
(((sd->card_status & CARD_IS_LOCKED) && lock) ||
(!(sd->card_status & CARD_IS_LOCKED) && !lock)))) {
sd->card_status |= LOCK_UNLOCK_FAILED;
return;
}
if (set_pwd) {
memcpy(sd->pwd, sd->data + 2 + sd->pwd_len, pwd_len);
sd->pwd_len = pwd_len;
}
if (clr_pwd) {
sd->pwd_len = 0;
}
if (lock)
sd->card_status |= CARD_IS_LOCKED;
else
sd->card_status &= ~CARD_IS_LOCKED;
}
static sd_rsp_type_t sd_normal_command(SDState *sd,
SDRequest req)
{
uint32_t rca = 0x0000;
uint64_t addr = (sd->ocr & (1 << 30)) ? (uint64_t) req.arg << 9 : req.arg;
if (sd_cmd_type[req.cmd] == sd_ac || sd_cmd_type[req.cmd] == sd_adtc)
rca = req.arg >> 16;
DPRINTF("CMD%d 0x%08x state %d\n", req.cmd, req.arg, sd->state);
switch (req.cmd) {
/* Basic commands (Class 0 and Class 1) */
case 0: /* CMD0: GO_IDLE_STATE */
switch (sd->state) {
case sd_inactive_state:
return sd->spi ? sd_r1 : sd_r0;
default:
sd->state = sd_idle_state;
sd_reset(sd, sd->bdrv);
return sd->spi ? sd_r1 : sd_r0;
}
break;
case 1: /* CMD1: SEND_OP_CMD */
if (!sd->spi)
goto bad_cmd;
sd->state = sd_transfer_state;
return sd_r1;
case 2: /* CMD2: ALL_SEND_CID */
if (sd->spi)
goto bad_cmd;
switch (sd->state) {
case sd_ready_state:
sd->state = sd_identification_state;
return sd_r2_i;
default:
break;
}
break;
case 3: /* CMD3: SEND_RELATIVE_ADDR */
if (sd->spi)
goto bad_cmd;
switch (sd->state) {
case sd_identification_state:
case sd_standby_state:
sd->state = sd_standby_state;
sd_set_rca(sd);
return sd_r6;
default:
break;
}
break;
case 4: /* CMD4: SEND_DSR */
if (sd->spi)
goto bad_cmd;
switch (sd->state) {
case sd_standby_state:
break;
default:
break;
}
break;
case 5: /* CMD5: reserved for SDIO cards */
return sd_illegal;
case 6: /* CMD6: SWITCH_FUNCTION */
if (sd->spi)
goto bad_cmd;
switch (sd->mode) {
case sd_data_transfer_mode:
sd_function_switch(sd, req.arg);
sd->state = sd_sendingdata_state;
sd->data_start = 0;
sd->data_offset = 0;
return sd_r1;
default:
break;
}
break;
case 7: /* CMD7: SELECT/DESELECT_CARD */
if (sd->spi)
goto bad_cmd;
switch (sd->state) {
case sd_standby_state:
if (sd->rca != rca)
return sd_r0;
sd->state = sd_transfer_state;
return sd_r1b;
case sd_transfer_state:
case sd_sendingdata_state:
if (sd->rca == rca)
break;
sd->state = sd_standby_state;
return sd_r1b;
case sd_disconnect_state:
if (sd->rca != rca)
return sd_r0;
sd->state = sd_programming_state;
return sd_r1b;
case sd_programming_state:
if (sd->rca == rca)
break;
sd->state = sd_disconnect_state;
return sd_r1b;
default:
break;
}
break;
case 8: /* CMD8: SEND_IF_COND */
/* Physical Layer Specification Version 2.00 command */
switch (sd->state) {
case sd_idle_state:
sd->vhs = 0;
/* No response if not exactly one VHS bit is set. */
if (!(req.arg >> 8) || (req.arg >> ffs(req.arg & ~0xff)))
return sd->spi ? sd_r7 : sd_r0;
/* Accept. */
sd->vhs = req.arg;
return sd_r7;
default:
break;
}
break;
case 9: /* CMD9: SEND_CSD */
switch (sd->state) {
case sd_standby_state:
if (sd->rca != rca)
return sd_r0;
return sd_r2_s;
case sd_transfer_state:
if (!sd->spi)
break;
sd->state = sd_sendingdata_state;
memcpy(sd->data, sd->csd, 16);
sd->data_start = addr;
sd->data_offset = 0;
return sd_r1;
default:
break;
}
break;
case 10: /* CMD10: SEND_CID */
switch (sd->state) {
case sd_standby_state:
if (sd->rca != rca)
return sd_r0;
return sd_r2_i;
case sd_transfer_state:
if (!sd->spi)
break;
sd->state = sd_sendingdata_state;
memcpy(sd->data, sd->cid, 16);
sd->data_start = addr;
sd->data_offset = 0;
return sd_r1;
default:
break;
}
break;
case 11: /* CMD11: READ_DAT_UNTIL_STOP */
if (sd->spi)
goto bad_cmd;
switch (sd->state) {
case sd_transfer_state:
sd->state = sd_sendingdata_state;
sd->data_start = req.arg;
sd->data_offset = 0;
if (sd->data_start + sd->blk_len > sd->size)
sd->card_status |= ADDRESS_ERROR;
return sd_r0;
default:
break;
}
break;
case 12: /* CMD12: STOP_TRANSMISSION */
switch (sd->state) {
case sd_sendingdata_state:
sd->state = sd_transfer_state;
return sd_r1b;
case sd_receivingdata_state:
sd->state = sd_programming_state;
/* Bzzzzzzztt .... Operation complete. */
sd->state = sd_transfer_state;
return sd_r1b;
default:
break;
}
break;
case 13: /* CMD13: SEND_STATUS */
switch (sd->mode) {
case sd_data_transfer_mode:
if (sd->rca != rca)
return sd_r0;
return sd_r1;
default:
break;
}
break;
case 15: /* CMD15: GO_INACTIVE_STATE */
if (sd->spi)
goto bad_cmd;
switch (sd->mode) {
case sd_data_transfer_mode:
if (sd->rca != rca)
return sd_r0;
sd->state = sd_inactive_state;
return sd_r0;
default:
break;
}
break;
/* Block read commands (Classs 2) */
case 16: /* CMD16: SET_BLOCKLEN */
switch (sd->state) {
case sd_transfer_state:
if (req.arg > (1 << HWBLOCK_SHIFT))
sd->card_status |= BLOCK_LEN_ERROR;
else
sd->blk_len = req.arg;
return sd_r1;
default:
break;
}
break;
case 17: /* CMD17: READ_SINGLE_BLOCK */
switch (sd->state) {
case sd_transfer_state:
sd->state = sd_sendingdata_state;
sd->data_start = addr;
sd->data_offset = 0;
if (sd->data_start + sd->blk_len > sd->size)
sd->card_status |= ADDRESS_ERROR;
return sd_r1;
default:
break;
}
break;
case 18: /* CMD18: READ_MULTIPLE_BLOCK */
switch (sd->state) {
case sd_transfer_state:
sd->state = sd_sendingdata_state;
sd->data_start = addr;
sd->data_offset = 0;
if (sd->data_start + sd->blk_len > sd->size)
sd->card_status |= ADDRESS_ERROR;
return sd_r1;
default:
break;
}
break;
/* Block write commands (Class 4) */
case 24: /* CMD24: WRITE_SINGLE_BLOCK */
if (sd->spi)
goto unimplemented_cmd;
switch (sd->state) {
case sd_transfer_state:
/* Writing in SPI mode not implemented. */
if (sd->spi)
break;
sd->state = sd_receivingdata_state;
sd->data_start = addr;
sd->data_offset = 0;
sd->blk_written = 0;
if (sd->data_start + sd->blk_len > sd->size)
sd->card_status |= ADDRESS_ERROR;
if (sd_wp_addr(sd, sd->data_start))
sd->card_status |= WP_VIOLATION;
if (sd->csd[14] & 0x30)
sd->card_status |= WP_VIOLATION;
return sd_r1;
default:
break;
}
break;
case 25: /* CMD25: WRITE_MULTIPLE_BLOCK */
if (sd->spi)
goto unimplemented_cmd;
switch (sd->state) {
case sd_transfer_state:
/* Writing in SPI mode not implemented. */
if (sd->spi)
break;
sd->state = sd_receivingdata_state;
sd->data_start = addr;
sd->data_offset = 0;
sd->blk_written = 0;
if (sd->data_start + sd->blk_len > sd->size)
sd->card_status |= ADDRESS_ERROR;
if (sd_wp_addr(sd, sd->data_start))
sd->card_status |= WP_VIOLATION;
if (sd->csd[14] & 0x30)
sd->card_status |= WP_VIOLATION;
return sd_r1;
default:
break;
}
break;
case 26: /* CMD26: PROGRAM_CID */
if (sd->spi)
goto bad_cmd;
switch (sd->state) {
case sd_transfer_state:
sd->state = sd_receivingdata_state;
sd->data_start = 0;
sd->data_offset = 0;
return sd_r1;
default:
break;
}
break;
case 27: /* CMD27: PROGRAM_CSD */
if (sd->spi)
goto unimplemented_cmd;
switch (sd->state) {
case sd_transfer_state:
sd->state = sd_receivingdata_state;
sd->data_start = 0;
sd->data_offset = 0;
return sd_r1;
default:
break;
}
break;
/* Write protection (Class 6) */
case 28: /* CMD28: SET_WRITE_PROT */
switch (sd->state) {
case sd_transfer_state:
if (addr >= sd->size) {
sd->card_status |= ADDRESS_ERROR;
return sd_r1b;
}
sd->state = sd_programming_state;
sd->wp_groups[addr >> (HWBLOCK_SHIFT +
SECTOR_SHIFT + WPGROUP_SHIFT)] = 1;
/* Bzzzzzzztt .... Operation complete. */
sd->state = sd_transfer_state;
return sd_r1b;
default:
break;
}
break;
case 29: /* CMD29: CLR_WRITE_PROT */
switch (sd->state) {
case sd_transfer_state:
if (addr >= sd->size) {
sd->card_status |= ADDRESS_ERROR;
return sd_r1b;
}
sd->state = sd_programming_state;
sd->wp_groups[addr >> (HWBLOCK_SHIFT +
SECTOR_SHIFT + WPGROUP_SHIFT)] = 0;
/* Bzzzzzzztt .... Operation complete. */
sd->state = sd_transfer_state;
return sd_r1b;
default:
break;
}
break;
case 30: /* CMD30: SEND_WRITE_PROT */
switch (sd->state) {
case sd_transfer_state:
sd->state = sd_sendingdata_state;
*(uint32_t *) sd->data = sd_wpbits(sd, req.arg);
sd->data_start = addr;
sd->data_offset = 0;
return sd_r1b;
default:
break;
}
break;
/* Erase commands (Class 5) */
case 32: /* CMD32: ERASE_WR_BLK_START */
switch (sd->state) {
case sd_transfer_state:
sd->erase_start = req.arg;
return sd_r1;
default:
break;
}
break;
case 33: /* CMD33: ERASE_WR_BLK_END */
switch (sd->state) {
case sd_transfer_state:
sd->erase_end = req.arg;
return sd_r1;
default:
break;
}
break;
case 38: /* CMD38: ERASE */
switch (sd->state) {
case sd_transfer_state:
if (sd->csd[14] & 0x30) {
sd->card_status |= WP_VIOLATION;
return sd_r1b;
}
sd->state = sd_programming_state;
sd_erase(sd);
/* Bzzzzzzztt .... Operation complete. */
sd->state = sd_transfer_state;
return sd_r1b;
default:
break;
}
break;
/* Lock card commands (Class 7) */
case 42: /* CMD42: LOCK_UNLOCK */
if (sd->spi)
goto unimplemented_cmd;
switch (sd->state) {
case sd_transfer_state:
sd->state = sd_receivingdata_state;
sd->data_start = 0;
sd->data_offset = 0;
return sd_r1;
default:
break;
}
break;
case 52:
case 53:
/* CMD52, CMD53: reserved for SDIO cards
* (see the SDIO Simplified Specification V2.0)
* Handle as illegal command but do not complain
* on stderr, as some OSes may use these in their
* probing for presence of an SDIO card.
*/
return sd_illegal;
/* Application specific commands (Class 8) */
case 55: /* CMD55: APP_CMD */
if (sd->rca != rca)
return sd_r0;
sd->card_status |= APP_CMD;
return sd_r1;
case 56: /* CMD56: GEN_CMD */
fprintf(stderr, "SD: GEN_CMD 0x%08x\n", req.arg);
switch (sd->state) {
case sd_transfer_state:
sd->data_offset = 0;
if (req.arg & 1)
sd->state = sd_sendingdata_state;
else
sd->state = sd_receivingdata_state;
return sd_r1;
default:
break;
}
break;
default:
bad_cmd:
fprintf(stderr, "SD: Unknown CMD%i\n", req.cmd);
return sd_illegal;
unimplemented_cmd:
/* Commands that are recognised but not yet implemented in SPI mode. */
fprintf(stderr, "SD: CMD%i not implemented in SPI mode\n", req.cmd);
return sd_illegal;
}
fprintf(stderr, "SD: CMD%i in a wrong state\n", req.cmd);
return sd_illegal;
}
static sd_rsp_type_t sd_app_command(SDState *sd,
SDRequest req)
{
DPRINTF("ACMD%d 0x%08x\n", req.cmd, req.arg);
switch (req.cmd) {
case 6: /* ACMD6: SET_BUS_WIDTH */
switch (sd->state) {
case sd_transfer_state:
sd->sd_status[0] &= 0x3f;
sd->sd_status[0] |= (req.arg & 0x03) << 6;
return sd_r1;
default:
break;
}
break;
case 13: /* ACMD13: SD_STATUS */
switch (sd->state) {
case sd_transfer_state:
sd->state = sd_sendingdata_state;
sd->data_start = 0;
sd->data_offset = 0;
return sd_r1;
default:
break;
}
break;
case 22: /* ACMD22: SEND_NUM_WR_BLOCKS */
switch (sd->state) {
case sd_transfer_state:
*(uint32_t *) sd->data = sd->blk_written;
sd->state = sd_sendingdata_state;
sd->data_start = 0;
sd->data_offset = 0;
return sd_r1;
default:
break;
}
break;
case 23: /* ACMD23: SET_WR_BLK_ERASE_COUNT */
switch (sd->state) {
case sd_transfer_state:
return sd_r1;
default:
break;
}
break;
case 41: /* ACMD41: SD_APP_OP_COND */
if (sd->spi) {
/* SEND_OP_CMD */
sd->state = sd_transfer_state;
return sd_r1;
}
switch (sd->state) {
case sd_idle_state:
/* We accept any voltage. 10000 V is nothing. */
if (req.arg)
sd->state = sd_ready_state;
return sd_r3;
default:
break;
}
break;
case 42: /* ACMD42: SET_CLR_CARD_DETECT */
switch (sd->state) {
case sd_transfer_state:
/* Bringing in the 50KOhm pull-up resistor... Done. */
return sd_r1;
default:
break;
}
break;
case 51: /* ACMD51: SEND_SCR */
switch (sd->state) {
case sd_transfer_state:
sd->state = sd_sendingdata_state;
sd->data_start = 0;
sd->data_offset = 0;
return sd_r1;
default:
break;
}
break;
default:
/* Fall back to standard commands. */
sd->card_status &= ~APP_CMD;
return sd_normal_command(sd, req);
}
fprintf(stderr, "SD: ACMD%i in a wrong state\n", req.cmd);
return sd_r0;
}
static int cmd_valid_while_locked(SDState *sd, SDRequest *req)
{
/* Valid commands in locked state:
* basic class (0)
* lock card class (7)
* CMD16
* implicitly, the ACMD prefix CMD55
* ACMD41 and ACMD42
* Anything else provokes an "illegal command" response.
*/
if (sd->card_status & APP_CMD) {
return req->cmd == 41 || req->cmd == 42;
}
if (req->cmd == 16 || req->cmd == 55) {
return 1;
}
return sd_cmd_class[req->cmd] == 0 || sd_cmd_class[req->cmd] == 7;
}
int sd_do_command(SDState *sd, SDRequest *req,
uint8_t *response) {
uint32_t last_status = sd->card_status;
sd_rsp_type_t rtype;
int rsplen;
if (!sd->bdrv || !bdrv_is_inserted(sd->bdrv) || !sd->enable) {
return 0;
}
if (sd_req_crc_validate(req)) {
sd->card_status |= COM_CRC_ERROR;
rtype = sd_illegal;
goto send_response;
}
sd->card_status &= ~CARD_STATUS_B;
sd_set_status(sd);
if (last_status & CARD_IS_LOCKED) {
if (!cmd_valid_while_locked(sd, req)) {
sd->card_status |= ILLEGAL_COMMAND;
fprintf(stderr, "SD: Card is locked\n");
rtype = sd_illegal;
goto send_response;
}
}
if (last_status & APP_CMD) {
rtype = sd_app_command(sd, *req);
sd->card_status &= ~APP_CMD;
} else
rtype = sd_normal_command(sd, *req);
if (rtype == sd_illegal) {
sd->card_status |= ILLEGAL_COMMAND;
}
sd->current_cmd = req->cmd;
send_response:
switch (rtype) {
case sd_r1:
case sd_r1b:
sd_response_r1_make(sd, response, last_status);
rsplen = 4;
break;
case sd_r2_i:
memcpy(response, sd->cid, sizeof(sd->cid));
rsplen = 16;
break;
case sd_r2_s:
memcpy(response, sd->csd, sizeof(sd->csd));
rsplen = 16;
break;
case sd_r3:
sd_response_r3_make(sd, response);
rsplen = 4;
break;
case sd_r6:
sd_response_r6_make(sd, response);
rsplen = 4;
break;
case sd_r7:
sd_response_r7_make(sd, response);
rsplen = 4;
break;
case sd_r0:
case sd_illegal:
default:
rsplen = 0;
break;
}
#ifdef DEBUG_SD
if (rsplen) {
int i;
DPRINTF("Response:");
for (i = 0; i < rsplen; i++)
printf(" %02x", response[i]);
printf(" state %d\n", sd->state);
} else {
DPRINTF("No response %d\n", sd->state);
}
#endif
return rsplen;
}
static void sd_blk_read(SDState *sd, uint64_t addr, uint32_t len)
{
uint64_t end = addr + len;
DPRINTF("sd_blk_read: addr = 0x%08llx, len = %d\n",
(unsigned long long) addr, len);
if (!sd->bdrv || bdrv_read(sd->bdrv, addr >> 9, sd->buf, 1) == -1) {
fprintf(stderr, "sd_blk_read: read error on host side\n");
return;
}
if (end > (addr & ~511) + 512) {
memcpy(sd->data, sd->buf + (addr & 511), 512 - (addr & 511));
if (bdrv_read(sd->bdrv, end >> 9, sd->buf, 1) == -1) {
fprintf(stderr, "sd_blk_read: read error on host side\n");
return;
}
memcpy(sd->data + 512 - (addr & 511), sd->buf, end & 511);
} else
memcpy(sd->data, sd->buf + (addr & 511), len);
}
static void sd_blk_write(SDState *sd, uint64_t addr, uint32_t len)
{
uint64_t end = addr + len;
if ((addr & 511) || len < 512)
if (!sd->bdrv || bdrv_read(sd->bdrv, addr >> 9, sd->buf, 1) == -1) {
fprintf(stderr, "sd_blk_write: read error on host side\n");
return;
}
if (end > (addr & ~511) + 512) {
memcpy(sd->buf + (addr & 511), sd->data, 512 - (addr & 511));
if (bdrv_write(sd->bdrv, addr >> 9, sd->buf, 1) == -1) {
fprintf(stderr, "sd_blk_write: write error on host side\n");
return;
}
if (bdrv_read(sd->bdrv, end >> 9, sd->buf, 1) == -1) {
fprintf(stderr, "sd_blk_write: read error on host side\n");
return;
}
memcpy(sd->buf, sd->data + 512 - (addr & 511), end & 511);
if (bdrv_write(sd->bdrv, end >> 9, sd->buf, 1) == -1)
fprintf(stderr, "sd_blk_write: write error on host side\n");
} else {
memcpy(sd->buf + (addr & 511), sd->data, len);
if (!sd->bdrv || bdrv_write(sd->bdrv, addr >> 9, sd->buf, 1) == -1)
fprintf(stderr, "sd_blk_write: write error on host side\n");
}
}
#define BLK_READ_BLOCK(a, len) sd_blk_read(sd, a, len)
#define BLK_WRITE_BLOCK(a, len) sd_blk_write(sd, a, len)
#define APP_READ_BLOCK(a, len) memset(sd->data, 0xec, len)
#define APP_WRITE_BLOCK(a, len)
void sd_write_data(SDState *sd, uint8_t value)
{
int i;
if (!sd->bdrv || !bdrv_is_inserted(sd->bdrv) || !sd->enable)
return;
if (sd->state != sd_receivingdata_state) {
fprintf(stderr, "sd_write_data: not in Receiving-Data state\n");
return;
}
if (sd->card_status & (ADDRESS_ERROR | WP_VIOLATION))
return;
switch (sd->current_cmd) {
case 24: /* CMD24: WRITE_SINGLE_BLOCK */
sd->data[sd->data_offset ++] = value;
if (sd->data_offset >= sd->blk_len) {
/* TODO: Check CRC before committing */
sd->state = sd_programming_state;
BLK_WRITE_BLOCK(sd->data_start, sd->data_offset);
sd->blk_written ++;
sd->csd[14] |= 0x40;
/* Bzzzzzzztt .... Operation complete. */
sd->state = sd_transfer_state;
}
break;
case 25: /* CMD25: WRITE_MULTIPLE_BLOCK */
if (sd->data_offset == 0) {
/* Start of the block - lets check the address is valid */
if (sd->data_start + sd->blk_len > sd->size) {
sd->card_status |= ADDRESS_ERROR;
break;
}
if (sd_wp_addr(sd, sd->data_start)) {
sd->card_status |= WP_VIOLATION;
break;
}
}
sd->data[sd->data_offset++] = value;
if (sd->data_offset >= sd->blk_len) {
/* TODO: Check CRC before committing */
sd->state = sd_programming_state;
BLK_WRITE_BLOCK(sd->data_start, sd->data_offset);
sd->blk_written++;
sd->data_start += sd->blk_len;
sd->data_offset = 0;
sd->csd[14] |= 0x40;
/* Bzzzzzzztt .... Operation complete. */
sd->state = sd_receivingdata_state;
}
break;
case 26: /* CMD26: PROGRAM_CID */
sd->data[sd->data_offset ++] = value;
if (sd->data_offset >= sizeof(sd->cid)) {
/* TODO: Check CRC before committing */
sd->state = sd_programming_state;
for (i = 0; i < sizeof(sd->cid); i ++)
if ((sd->cid[i] | 0x00) != sd->data[i])
sd->card_status |= CID_CSD_OVERWRITE;
if (!(sd->card_status & CID_CSD_OVERWRITE))
for (i = 0; i < sizeof(sd->cid); i ++) {
sd->cid[i] |= 0x00;
sd->cid[i] &= sd->data[i];
}
/* Bzzzzzzztt .... Operation complete. */
sd->state = sd_transfer_state;
}
break;
case 27: /* CMD27: PROGRAM_CSD */
sd->data[sd->data_offset ++] = value;
if (sd->data_offset >= sizeof(sd->csd)) {
/* TODO: Check CRC before committing */
sd->state = sd_programming_state;
for (i = 0; i < sizeof(sd->csd); i ++)
if ((sd->csd[i] | sd_csd_rw_mask[i]) !=
(sd->data[i] | sd_csd_rw_mask[i]))
sd->card_status |= CID_CSD_OVERWRITE;
/* Copy flag (OTP) & Permanent write protect */
if (sd->csd[14] & ~sd->data[14] & 0x60)
sd->card_status |= CID_CSD_OVERWRITE;
if (!(sd->card_status & CID_CSD_OVERWRITE))
for (i = 0; i < sizeof(sd->csd); i ++) {
sd->csd[i] |= sd_csd_rw_mask[i];
sd->csd[i] &= sd->data[i];
}
/* Bzzzzzzztt .... Operation complete. */
sd->state = sd_transfer_state;
}
break;
case 42: /* CMD42: LOCK_UNLOCK */
sd->data[sd->data_offset ++] = value;
if (sd->data_offset >= sd->blk_len) {
/* TODO: Check CRC before committing */
sd->state = sd_programming_state;
sd_lock_command(sd);
/* Bzzzzzzztt .... Operation complete. */
sd->state = sd_transfer_state;
}
break;
case 56: /* CMD56: GEN_CMD */
sd->data[sd->data_offset ++] = value;
if (sd->data_offset >= sd->blk_len) {
APP_WRITE_BLOCK(sd->data_start, sd->data_offset);
sd->state = sd_transfer_state;
}
break;
default:
fprintf(stderr, "sd_write_data: unknown command\n");
break;
}
}
uint8_t sd_read_data(SDState *sd)
{
/* TODO: Append CRCs */
uint8_t ret;
int io_len;
if (!sd->bdrv || !bdrv_is_inserted(sd->bdrv) || !sd->enable)
return 0x00;
if (sd->state != sd_sendingdata_state) {
fprintf(stderr, "sd_read_data: not in Sending-Data state\n");
return 0x00;
}
if (sd->card_status & (ADDRESS_ERROR | WP_VIOLATION))
return 0x00;
io_len = (sd->ocr & (1 << 30)) ? 512 : sd->blk_len;
switch (sd->current_cmd) {
case 6: /* CMD6: SWITCH_FUNCTION */
ret = sd->data[sd->data_offset ++];
if (sd->data_offset >= 64)
sd->state = sd_transfer_state;
break;
case 9: /* CMD9: SEND_CSD */
case 10: /* CMD10: SEND_CID */
ret = sd->data[sd->data_offset ++];
if (sd->data_offset >= 16)
sd->state = sd_transfer_state;
break;
case 11: /* CMD11: READ_DAT_UNTIL_STOP */
if (sd->data_offset == 0)
BLK_READ_BLOCK(sd->data_start, io_len);
ret = sd->data[sd->data_offset ++];
if (sd->data_offset >= io_len) {
sd->data_start += io_len;
sd->data_offset = 0;
if (sd->data_start + io_len > sd->size) {
sd->card_status |= ADDRESS_ERROR;
break;
}
}
break;
case 13: /* ACMD13: SD_STATUS */
ret = sd->sd_status[sd->data_offset ++];
if (sd->data_offset >= sizeof(sd->sd_status))
sd->state = sd_transfer_state;
break;
case 17: /* CMD17: READ_SINGLE_BLOCK */
if (sd->data_offset == 0)
BLK_READ_BLOCK(sd->data_start, io_len);
ret = sd->data[sd->data_offset ++];
if (sd->data_offset >= io_len)
sd->state = sd_transfer_state;
break;
case 18: /* CMD18: READ_MULTIPLE_BLOCK */
if (sd->data_offset == 0)
BLK_READ_BLOCK(sd->data_start, io_len);
ret = sd->data[sd->data_offset ++];
if (sd->data_offset >= io_len) {
sd->data_start += io_len;
sd->data_offset = 0;
if (sd->data_start + io_len > sd->size) {
sd->card_status |= ADDRESS_ERROR;
break;
}
}
break;
case 22: /* ACMD22: SEND_NUM_WR_BLOCKS */
ret = sd->data[sd->data_offset ++];
if (sd->data_offset >= 4)
sd->state = sd_transfer_state;
break;
case 30: /* CMD30: SEND_WRITE_PROT */
ret = sd->data[sd->data_offset ++];
if (sd->data_offset >= 4)
sd->state = sd_transfer_state;
break;
case 51: /* ACMD51: SEND_SCR */
ret = sd->scr[sd->data_offset ++];
if (sd->data_offset >= sizeof(sd->scr))
sd->state = sd_transfer_state;
break;
case 56: /* CMD56: GEN_CMD */
if (sd->data_offset == 0)
APP_READ_BLOCK(sd->data_start, sd->blk_len);
ret = sd->data[sd->data_offset ++];
if (sd->data_offset >= sd->blk_len)
sd->state = sd_transfer_state;
break;
default:
fprintf(stderr, "sd_read_data: unknown command\n");
return 0x00;
}
return ret;
}
int sd_data_ready(SDState *sd)
{
return sd->state == sd_sendingdata_state;
}
void sd_enable(SDState *sd, int enable)
{
sd->enable = enable;
}
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