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authorpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2007-04-06 16:49:48 +0000
committerpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2007-04-06 16:49:48 +0000
commita1bb27b1e98a372545f37a599c0f9ea785502554 (patch)
tree5fa9e7adb13704849dddfa7ce82e32c931564543 /hw/sd.c
parent84409ddbda9b4d8f2d2ad4f580e987800b8e7c4e (diff)
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SD card emulation (initial implementation by Andrzei Zaborowski).
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2620 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/sd.c')
-rw-r--r--hw/sd.c1508
1 files changed, 1508 insertions, 0 deletions
diff --git a/hw/sd.c b/hw/sd.c
new file mode 100644
index 0000000..799c945
--- /dev/null
+++ b/hw/sd.c
@@ -0,0 +1,1508 @@
+/*
+ * 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 "sd.h"
+
+//#define DEBUG_SD 1
+
+#ifdef DEBUG_SD
+#define DPRINTF(fmt, args...) \
+do { printf("SD: " fmt , ##args); } while (0)
+#else
+#define DPRINTF(fmt, args...) 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_r1b = -1,
+} 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];
+ int wp_switch;
+ int *wp_groups;
+ uint32_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 current_cmd;
+ int blk_written;
+ uint32_t data_start;
+ uint32_t data_offset;
+ uint8_t data[512];
+ void (*readonly_cb)(void *, int);
+ void (*inserted_cb)(void *, int);
+ void *opaque;
+ BlockDriverState *bdrv;
+};
+
+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;
+}
+
+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_none, 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,
+};
+
+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)
+{
+ sd->ocr = 0x80fffff0;
+}
+
+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 BLOCK_SIZE (1 << (HWBLOCK_SHIFT))
+#define SECTOR_SIZE (1 << (HWBLOCK_SHIFT + SECTOR_SHIFT))
+#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, uint32_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;
+
+ 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;
+}
+
+static void sd_set_rca(SDState *sd)
+{
+ sd->rca += 0x4567;
+}
+
+#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(struct sd_request_s *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 */
+}
+
+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;
+}
+
+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;
+}
+
+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_reset(SDState *sd, BlockDriverState *bdrv)
+{
+ uint32_t size;
+ uint64_t sect;
+
+ bdrv_get_geometry(bdrv, &sect);
+ sect <<= 9;
+
+ if (sect > 0x40000000)
+ size = 0x40000000; /* 1 gig */
+ else
+ size = sect + 1;
+
+ 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;
+
+ sd->wp_switch = bdrv_is_read_only(bdrv);
+ sd->wp_groups = (int *) qemu_mallocz(sizeof(int) * sect);
+ memset(sd->wp_groups, 0, 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)
+{
+ SDState *sd = opaque;
+ if (sd->inserted_cb)
+ sd->inserted_cb(sd->opaque, bdrv_is_inserted(sd->bdrv));
+ if (bdrv_is_inserted(sd->bdrv)) {
+ sd_reset(sd, sd->bdrv);
+ if (sd->readonly_cb)
+ sd->readonly_cb(sd->opaque, sd->wp_switch);
+ }
+}
+
+SDState *sd_init(BlockDriverState *bs)
+{
+ SDState *sd;
+
+ sd = (SDState *) qemu_mallocz(sizeof(SDState));
+ sd_reset(sd, bs);
+ return sd;
+}
+
+void sd_set_cb(SDState *sd, void *opaque,
+ void (*readonly_cb)(void *, int),
+ void (*inserted_cb)(void *, int))
+{
+ sd->opaque = opaque;
+ sd->readonly_cb = readonly_cb;
+ sd->inserted_cb = inserted_cb;
+ if (sd->readonly_cb)
+ sd->readonly_cb(sd->opaque, bdrv_is_read_only(sd->bdrv));
+ if (sd->inserted_cb)
+ sd->inserted_cb(sd->opaque, bdrv_is_inserted(sd->bdrv));
+ bdrv_set_change_cb(sd->bdrv, sd_cardchange, sd);
+}
+
+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, uint32_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! */
+ printf("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,
+ struct sd_request_s req)
+{
+ uint32_t rca = 0x0000;
+
+ 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_r0;
+
+ default:
+ sd->state = sd_idle_state;
+ sd_reset(sd, sd->bdrv);
+ return sd_r0;
+ }
+ break;
+
+ case 2: /* CMD2: ALL_SEND_CID */
+ 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 */
+ 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 */
+ switch (sd->state) {
+ case sd_standby_state:
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case 6: /* CMD6: SWITCH_FUNCTION */
+ 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 */
+ 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 9: /* CMD9: SEND_CSD */
+ switch (sd->state) {
+ case sd_standby_state:
+ if (sd->rca != rca)
+ return sd_r0;
+
+ return sd_r2_s;
+
+ 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;
+
+ default:
+ break;
+ }
+ break;
+
+ case 11: /* CMD11: READ_DAT_UNTIL_STOP */
+ 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 */
+ 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 = req.arg;
+ 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 = req.arg;
+ 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 */
+ switch (sd->state) {
+ case sd_transfer_state:
+ sd->state = sd_receivingdata_state;
+ sd->data_start = req.arg;
+ 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 */
+ switch (sd->state) {
+ case sd_transfer_state:
+ sd->state = sd_receivingdata_state;
+ sd->data_start = req.arg;
+ 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 */
+ 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 */
+ 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 (req.arg >= sd->size) {
+ sd->card_status = ADDRESS_ERROR;
+ return sd_r1b;
+ }
+
+ sd->state = sd_programming_state;
+ sd->wp_groups[req.arg >> (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 (req.arg >= sd->size) {
+ sd->card_status = ADDRESS_ERROR;
+ return sd_r1b;
+ }
+
+ sd->state = sd_programming_state;
+ sd->wp_groups[req.arg >> (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 = req.arg;
+ 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 */
+ 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;
+
+ /* 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 */
+ printf("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:
+ sd->card_status |= ILLEGAL_COMMAND;
+
+ printf("SD: Unknown CMD%i\n", req.cmd);
+ return sd_r0;
+ }
+
+ sd->card_status |= ILLEGAL_COMMAND;
+ printf("SD: CMD%i in a wrong state\n", req.cmd);
+ return sd_r0;
+}
+
+static sd_rsp_type_t sd_app_command(SDState *sd,
+ struct sd_request_s req) {
+ uint32_t rca;
+
+ if (sd_cmd_type[req.cmd] == sd_ac || sd_cmd_type[req.cmd] == sd_adtc)
+ rca = req.arg >> 16;
+
+ 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->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->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 */
+ 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);
+ }
+
+ printf("SD: ACMD%i in a wrong state\n", req.cmd);
+ return sd_r0;
+}
+
+int sd_do_command(SDState *sd, struct sd_request_s *req,
+ uint8_t *response) {
+ uint32_t last_status = sd->card_status;
+ sd_rsp_type_t rtype;
+ int rsplen;
+
+ if (!bdrv_is_inserted(sd->bdrv)) {
+ return 0;
+ }
+
+ if (sd_req_crc_validate(req)) {
+ sd->card_status &= ~COM_CRC_ERROR;
+ return 0;
+ }
+
+ sd->card_status &= ~CARD_STATUS_B;
+ sd_set_status(sd);
+
+ if (last_status & CARD_IS_LOCKED)
+ if (((last_status & APP_CMD) &&
+ req->cmd == 41) ||
+ (!(last_status & APP_CMD) &&
+ (sd_cmd_class[req->cmd] == 0 ||
+ sd_cmd_class[req->cmd] == 7 ||
+ req->cmd == 16 || req->cmd == 55))) {
+ sd->card_status |= ILLEGAL_COMMAND;
+ printf("SD: Card is locked\n");
+ return 0;
+ }
+
+ if (last_status & APP_CMD)
+ rtype = sd_app_command(sd, *req);
+ else
+ rtype = sd_normal_command(sd, *req);
+
+ sd->current_cmd = req->cmd;
+
+ 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));
+ response[7] |= 1;
+ rsplen = 16;
+ break;
+
+ case sd_r2_s:
+ memcpy(response, sd->csd, sizeof(sd->csd));
+ response[7] |= 1;
+ 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_r0:
+ default:
+ rsplen = 0;
+ break;
+ }
+
+ if (sd->card_status & ILLEGAL_COMMAND)
+ rsplen = 0;
+
+#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;
+}
+
+/* No real need for 64 bit addresses here */
+static void sd_blk_read(BlockDriverState *bdrv,
+ void *data, uint32_t addr, uint32_t len)
+{
+ uint8_t buf[512];
+ uint32_t end = addr + len;
+
+ if (!bdrv || bdrv_read(bdrv, addr >> 9, buf, 1) == -1) {
+ printf("sd_blk_read: read error on host side\n");
+ return;
+ }
+
+ if (end > (addr & ~511) + 512) {
+ memcpy(data, buf + (addr & 511), 512 - (addr & 511));
+
+ if (bdrv_read(bdrv, end >> 9, buf, 1) == -1) {
+ printf("sd_blk_read: read error on host side\n");
+ return;
+ }
+ memcpy(data + 512 - (addr & 511), buf, end & 511);
+ } else
+ memcpy(data, buf + (addr & 511), len);
+}
+
+static void sd_blk_write(BlockDriverState *bdrv,
+ void *data, uint32_t addr, uint32_t len)
+{
+ uint8_t buf[512];
+ uint32_t end = addr + len;
+
+ if ((addr & 511) || len < 512)
+ if (!bdrv || bdrv_read(bdrv, addr >> 9, buf, 1) == -1) {
+ printf("sd_blk_write: read error on host side\n");
+ return;
+ }
+
+ if (end > (addr & ~511) + 512) {
+ memcpy(buf + (addr & 511), data, 512 - (addr & 511));
+ if (bdrv_write(bdrv, addr >> 9, buf, 1) == -1) {
+ printf("sd_blk_write: write error on host side\n");
+ return;
+ }
+
+ if (bdrv_read(bdrv, end >> 9, buf, 1) == -1) {
+ printf("sd_blk_write: read error on host side\n");
+ return;
+ }
+ memcpy(buf, data + 512 - (addr & 511), end & 511);
+ if (bdrv_write(bdrv, end >> 9, buf, 1) == -1)
+ printf("sd_blk_write: write error on host side\n");
+ } else {
+ memcpy(buf + (addr & 511), data, len);
+ if (!bdrv || bdrv_write(bdrv, addr >> 9, buf, 1) == -1)
+ printf("sd_blk_write: write error on host side\n");
+ }
+}
+
+#define BLK_READ_BLOCK(a, len) sd_blk_read(sd->bdrv, sd->data, a, len)
+#define BLK_WRITE_BLOCK(a, len) sd_blk_write(sd->bdrv, sd->data, 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))
+ return;
+
+ if (sd->state != sd_receivingdata_state) {
+ printf("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 */
+ 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;
+ 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->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:
+ printf("sd_write_data: unknown command\n");
+ break;
+ }
+}
+
+uint8_t sd_read_data(SDState *sd)
+{
+ /* TODO: Append CRCs */
+ uint8_t ret;
+
+ if (!sd->bdrv || !bdrv_is_inserted(sd->bdrv))
+ return 0x00;
+
+ if (sd->state != sd_sendingdata_state) {
+ printf("sd_read_data: not in Sending-Data state\n");
+ return 0x00;
+ }
+
+ if (sd->card_status & (ADDRESS_ERROR | WP_VIOLATION))
+ return 0x00;
+
+ 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 11: /* CMD11: READ_DAT_UNTIL_STOP */
+ if (sd->data_offset == 0)
+ BLK_READ_BLOCK(sd->data_start, sd->blk_len);
+ ret = sd->data[sd->data_offset ++];
+
+ if (sd->data_offset >= sd->blk_len) {
+ sd->data_start += sd->blk_len;
+ sd->data_offset = 0;
+ if (sd->data_start + sd->blk_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, sd->blk_len);
+ ret = sd->data[sd->data_offset ++];
+
+ if (sd->data_offset >= sd->blk_len)
+ sd->state = sd_transfer_state;
+ break;
+
+ case 18: /* CMD18: READ_MULTIPLE_BLOCK */
+ if (sd->data_offset == 0)
+ BLK_READ_BLOCK(sd->data_start, sd->blk_len);
+ ret = sd->data[sd->data_offset ++];
+
+ if (sd->data_offset >= sd->blk_len) {
+ sd->data_start += sd->blk_len;
+ sd->data_offset = 0;
+ if (sd->data_start + sd->blk_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:
+ printf("sd_read_data: unknown command\n");
+ return 0x00;
+ }
+
+ return ret;
+}
+
+int sd_data_ready(SDState *sd)
+{
+ return sd->state == sd_sendingdata_state;
+}