diff options
Diffstat (limited to 'src/hw/sd/sd.c')
| -rw-r--r-- | src/hw/sd/sd.c | 1767 |
1 files changed, 1767 insertions, 0 deletions
diff --git a/src/hw/sd/sd.c b/src/hw/sd/sd.c new file mode 100644 index 0000000..1a9935c --- /dev/null +++ b/src/hw/sd/sd.c @@ -0,0 +1,1767 @@ +/* + * 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/hw.h" +#include "sysemu/block-backend.h" +#include "hw/sd/sd.h" +#include "qemu/bitmap.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 + +#define ACMD41_ENQUIRY_MASK 0x00ffffff + +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; + +enum SDCardModes { + sd_inactive, + sd_card_identification_mode, + sd_data_transfer_mode, +}; + +enum SDCardStates { + 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, +}; + +struct SDState { + uint32_t mode; /* current card mode, one of SDCardModes */ + int32_t state; /* current card state, one of SDCardStates */ + 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; + bool wp_switch; + unsigned long *wp_groups; + int32_t wpgrps_size; + uint64_t size; + uint32_t blk_len; + uint32_t erase_start; + uint32_t erase_end; + uint8_t pwd[16]; + uint32_t pwd_len; + uint8_t function_group[6]; + + bool spi; + uint8_t current_cmd; + /* True if we will handle the next command as an ACMD. Note that this does + * *not* track the APP_CMD status bit! + */ + bool expecting_acmd; + uint32_t blk_written; + uint64_t data_start; + uint32_t data_offset; + uint8_t data[512]; + qemu_irq readonly_cb; + qemu_irq inserted_cb; + BlockBackend *blk; + uint8_t *buf; + + bool enable; +}; + +static void sd_set_mode(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; + } +} + +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 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 Memory 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 status = sd->card_status; + /* Clear the "clear on read" status bits */ + sd->card_status &= ~CARD_STATUS_C; + + 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); + sd->card_status &= ~(CARD_STATUS_C & 0xc81fff); + + 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 inline uint64_t sd_addr_to_wpnum(uint64_t addr) +{ + return addr >> (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT); +} + +static void sd_reset(SDState *sd) +{ + uint64_t size; + uint64_t sect; + + if (sd->blk) { + blk_get_geometry(sd->blk, §); + } else { + sect = 0; + } + size = sect << 9; + + sect = sd_addr_to_wpnum(size) + 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); + + g_free(sd->wp_groups); + sd->wp_switch = sd->blk ? blk_is_read_only(sd->blk) : false; + sd->wpgrps_size = sect; + sd->wp_groups = bitmap_new(sd->wpgrps_size); + memset(sd->function_group, 0, sizeof(sd->function_group)); + sd->erase_start = 0; + sd->erase_end = 0; + sd->size = size; + sd->blk_len = 0x200; + sd->pwd_len = 0; + sd->expecting_acmd = false; +} + +static void sd_cardchange(void *opaque, bool load) +{ + SDState *sd = opaque; + + qemu_set_irq(sd->inserted_cb, blk_is_inserted(sd->blk)); + if (blk_is_inserted(sd->blk)) { + sd_reset(sd); + qemu_set_irq(sd->readonly_cb, sd->wp_switch); + } +} + +static const BlockDevOps sd_block_ops = { + .change_media_cb = sd_cardchange, +}; + +static const VMStateDescription sd_vmstate = { + .name = "sd-card", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT32(mode, SDState), + VMSTATE_INT32(state, SDState), + VMSTATE_UINT8_ARRAY(cid, SDState, 16), + VMSTATE_UINT8_ARRAY(csd, SDState, 16), + VMSTATE_UINT16(rca, SDState), + VMSTATE_UINT32(card_status, SDState), + VMSTATE_PARTIAL_BUFFER(sd_status, SDState, 1), + VMSTATE_UINT32(vhs, SDState), + VMSTATE_BITMAP(wp_groups, SDState, 0, wpgrps_size), + VMSTATE_UINT32(blk_len, SDState), + VMSTATE_UINT32(erase_start, SDState), + VMSTATE_UINT32(erase_end, SDState), + VMSTATE_UINT8_ARRAY(pwd, SDState, 16), + VMSTATE_UINT32(pwd_len, SDState), + VMSTATE_UINT8_ARRAY(function_group, SDState, 6), + VMSTATE_UINT8(current_cmd, SDState), + VMSTATE_BOOL(expecting_acmd, SDState), + VMSTATE_UINT32(blk_written, SDState), + VMSTATE_UINT64(data_start, SDState), + VMSTATE_UINT32(data_offset, SDState), + VMSTATE_UINT8_ARRAY(data, SDState, 512), + VMSTATE_BUFFER_POINTER_UNSAFE(buf, SDState, 1, 512), + VMSTATE_BOOL(enable, SDState), + VMSTATE_END_OF_LIST() + } +}; + +/* 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(BlockBackend *blk, bool is_spi) +{ + SDState *sd; + + if (blk && blk_is_read_only(blk)) { + fprintf(stderr, "sd_init: Cannot use read-only drive\n"); + return NULL; + } + + sd = (SDState *) g_malloc0(sizeof(SDState)); + sd->buf = blk_blockalign(blk, 512); + sd->spi = is_spi; + sd->enable = true; + sd->blk = blk; + sd_reset(sd); + if (sd->blk) { + /* Attach dev if not already attached. (This call ignores an + * error return code if sd->blk is already attached.) */ + /* FIXME ignoring blk_attach_dev() failure is dangerously brittle */ + blk_attach_dev(sd->blk, sd); + blk_set_dev_ops(sd->blk, &sd_block_ops, sd); + } + vmstate_register(NULL, -1, &sd_vmstate, 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->blk ? blk_is_read_only(sd->blk) : 0); + qemu_set_irq(insert, sd->blk ? blk_is_inserted(sd->blk) : 0); +} + +static void sd_erase(SDState *sd) +{ + int i; + uint64_t erase_start = sd->erase_start; + uint64_t erase_end = sd->erase_end; + + if (!sd->erase_start || !sd->erase_end) { + sd->card_status |= ERASE_SEQ_ERROR; + return; + } + + if (extract32(sd->ocr, OCR_CCS_BITN, 1)) { + /* High capacity memory card: erase units are 512 byte blocks */ + erase_start *= 512; + erase_end *= 512; + } + + erase_start = sd_addr_to_wpnum(erase_start); + erase_end = sd_addr_to_wpnum(erase_end); + sd->erase_start = 0; + sd->erase_end = 0; + sd->csd[14] |= 0x40; + + for (i = erase_start; i <= erase_end; i++) { + if (test_bit(i, sd->wp_groups)) { + 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 = sd_addr_to_wpnum(addr); + + for (i = 0; i < 32; i++, wpnum++, addr += WPGROUP_SIZE) { + if (addr < sd->size && test_bit(wpnum, sd->wp_groups)) { + 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 bool sd_wp_addr(SDState *sd, uint64_t addr) +{ + return test_bit(sd_addr_to_wpnum(addr), sd->wp_groups); +} + +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; + } + bitmap_zero(sd->wp_groups, sd->wpgrps_size); + 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; + + /* Not interpreting this as an app command */ + sd->card_status &= ~APP_CMD; + + 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); + 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 >> (ctz32(req.arg & ~0xff) + 1))) { + 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; + set_bit(sd_addr_to_wpnum(addr), sd->wp_groups); + /* 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; + clear_bit(sd_addr_to_wpnum(addr), sd->wp_groups); + /* 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->expecting_acmd = true; + 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); + sd->card_status |= APP_CMD; + 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. + * + * We don't model init delay so just advance straight to ready state + * unless it's an enquiry ACMD41 (bits 23:0 == 0). + */ + if (req.arg & ACMD41_ENQUIRY_MASK) { + 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. */ + return sd_normal_command(sd, req); + } + + fprintf(stderr, "SD: ACMD%i in a wrong state\n", req.cmd); + return sd_illegal; +} + +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->expecting_acmd) { + 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) { + int last_state; + sd_rsp_type_t rtype; + int rsplen; + + if (!sd->blk || !blk_is_inserted(sd->blk) || !sd->enable) { + return 0; + } + + if (sd_req_crc_validate(req)) { + sd->card_status |= COM_CRC_ERROR; + rtype = sd_illegal; + goto send_response; + } + + if (sd->card_status & CARD_IS_LOCKED) { + if (!cmd_valid_while_locked(sd, req)) { + sd->card_status |= ILLEGAL_COMMAND; + sd->expecting_acmd = false; + fprintf(stderr, "SD: Card is locked\n"); + rtype = sd_illegal; + goto send_response; + } + } + + last_state = sd->state; + sd_set_mode(sd); + + if (sd->expecting_acmd) { + sd->expecting_acmd = false; + rtype = sd_app_command(sd, *req); + } else { + rtype = sd_normal_command(sd, *req); + } + + if (rtype == sd_illegal) { + sd->card_status |= ILLEGAL_COMMAND; + } else { + /* Valid command, we can update the 'state before command' bits. + * (Do this now so they appear in r1 responses.) + */ + sd->current_cmd = req->cmd; + sd->card_status &= ~CURRENT_STATE; + sd->card_status |= (last_state << 9); + } + +send_response: + switch (rtype) { + case sd_r1: + case sd_r1b: + sd_response_r1_make(sd, response); + 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; + } + + if (rtype != sd_illegal) { + /* Clear the "clear on valid command" status bits now we've + * sent any response + */ + sd->card_status &= ~CARD_STATUS_B; + } + +#ifdef DEBUG_SD + if (rsplen) { + int i; + DPRINTF("Response:"); + for (i = 0; i < rsplen; i++) + fprintf(stderr, " %02x", response[i]); + fprintf(stderr, " 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->blk || blk_read(sd->blk, addr >> 9, sd->buf, 1) < 0) { + 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 (blk_read(sd->blk, end >> 9, sd->buf, 1) < 0) { + 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->blk || blk_read(sd->blk, addr >> 9, sd->buf, 1) < 0) { + 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 (blk_write(sd->blk, addr >> 9, sd->buf, 1) < 0) { + fprintf(stderr, "sd_blk_write: write error on host side\n"); + return; + } + + if (blk_read(sd->blk, end >> 9, sd->buf, 1) < 0) { + fprintf(stderr, "sd_blk_write: read error on host side\n"); + return; + } + memcpy(sd->buf, sd->data + 512 - (addr & 511), end & 511); + if (blk_write(sd->blk, end >> 9, sd->buf, 1) < 0) { + fprintf(stderr, "sd_blk_write: write error on host side\n"); + } + } else { + memcpy(sd->buf + (addr & 511), sd->data, len); + if (!sd->blk || blk_write(sd->blk, addr >> 9, sd->buf, 1) < 0) { + 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->blk || !blk_is_inserted(sd->blk) || !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 - let's 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->blk || !blk_is_inserted(sd->blk) || !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; +} + +bool sd_data_ready(SDState *sd) +{ + return sd->state == sd_sendingdata_state; +} + +void sd_enable(SDState *sd, bool enable) +{ + sd->enable = enable; +} |
