Partial SD card SPI mode support.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3731 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/hw/ssi-sd.c b/hw/ssi-sd.c
new file mode 100644
index 0000000..8b45fc4
--- /dev/null
+++ b/hw/ssi-sd.c
@@ -0,0 +1,202 @@
+/*
+ * SSI to SD card adapter.
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licenced under the GPL.
+ */
+
+#include "hw.h"
+#include "sd.h"
+
+//#define DEBUG_SSI_SD 1
+
+#ifdef DEBUG_SSI_SD
+#define DPRINTF(fmt, args...) \
+do { printf("ssi_sd: " fmt , ##args); } while (0)
+#define BADF(fmt, args...) \
+do { fprintf(stderr, "ssi_sd: error: " fmt , ##args); exit(1);} while (0)
+#else
+#define DPRINTF(fmt, args...) do {} while(0)
+#define BADF(fmt, args...) \
+do { fprintf(stderr, "ssi_sd: error: " fmt , ##args);} while (0)
+#endif
+
+typedef enum {
+ SSI_SD_CMD,
+ SSI_SD_CMDARG,
+ SSI_SD_RESPONSE,
+ SSI_SD_DATA_START,
+ SSI_SD_DATA_READ,
+} ssi_sd_mode;
+
+typedef struct {
+ ssi_sd_mode mode;
+ int cmd;
+ uint8_t cmdarg[4];
+ uint8_t response[5];
+ int arglen;
+ int response_pos;
+ int stopping;
+ SDState *sd;
+} ssi_sd_state;
+
+/* State word bits. */
+#define SSI_SDR_LOCKED 0x0001
+#define SSI_SDR_WP_ERASE 0x0002
+#define SSI_SDR_ERROR 0x0004
+#define SSI_SDR_CC_ERROR 0x0008
+#define SSI_SDR_ECC_FAILED 0x0010
+#define SSI_SDR_WP_VIOLATION 0x0020
+#define SSI_SDR_ERASE_PARAM 0x0040
+#define SSI_SDR_OUT_OF_RANGE 0x0080
+#define SSI_SDR_IDLE 0x0100
+#define SSI_SDR_ERASE_RESET 0x0200
+#define SSI_SDR_ILLEGAL_COMMAND 0x0400
+#define SSI_SDR_COM_CRC_ERROR 0x0800
+#define SSI_SDR_ERASE_SEQ_ERROR 0x1000
+#define SSI_SDR_ADDRESS_ERROR 0x2000
+#define SSI_SDR_PARAMETER_ERROR 0x4000
+
+int ssi_sd_xfer(void *opaque, int val)
+{
+ ssi_sd_state *s = (ssi_sd_state *)opaque;
+
+ /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data. */
+ if (s->mode == SSI_SD_DATA_READ && val == 0x4d) {
+ s->mode = SSI_SD_CMD;
+ /* There must be at least one byte delay before the card responds. */
+ s->stopping = 1;
+ }
+
+ switch (s->mode) {
+ case SSI_SD_CMD:
+ if (val == 0xff) {
+ DPRINTF("NULL command\n");
+ return 0xff;
+ }
+ s->cmd = val & 0x3f;
+ s->mode = SSI_SD_CMDARG;
+ s->arglen = 0;
+ return 0xff;
+ case SSI_SD_CMDARG:
+ if (s->arglen == 4) {
+ struct sd_request_s request;
+ uint8_t longresp[16];
+ /* FIXME: Check CRC. */
+ request.cmd = s->cmd;
+ request.arg = (s->cmdarg[0] << 24) | (s->cmdarg[1] << 16)
+ | (s->cmdarg[2] << 8) | s->cmdarg[3];
+ DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg);
+ s->arglen = sd_do_command(s->sd, &request, longresp);
+ if (s->arglen <= 0) {
+ s->arglen = 1;
+ s->response[0] = 4;
+ DPRINTF("SD command failed\n");
+ } else if (s->cmd == 58) {
+ /* CMD58 returns R3 response (OCR) */
+ DPRINTF("Returned OCR\n");
+ s->arglen = 5;
+ s->response[0] = 1;
+ memcpy(&s->response[1], longresp, 4);
+ } else if (s->arglen != 4) {
+ BADF("Unexpected response to cmd %d\n", s->cmd);
+ /* Illegal command is about as near as we can get. */
+ s->arglen = 1;
+ s->response[0] = 4;
+ } else {
+ /* All other commands return status. */
+ uint32_t cardstatus;
+ uint16_t status;
+ /* CMD13 returns a 2-byte statuse work. Other commands
+ only return the first byte. */
+ s->arglen = (s->cmd == 13) ? 2 : 1;
+ cardstatus = (longresp[0] << 24) | (longresp[1] << 16)
+ | (longresp[2] << 8) | longresp[3];
+ status = 0;
+ if (((cardstatus >> 9) & 0xf) < 4)
+ status |= SSI_SDR_IDLE;
+ if (cardstatus & ERASE_RESET)
+ status |= SSI_SDR_ERASE_RESET;
+ if (cardstatus & ILLEGAL_COMMAND)
+ status |= SSI_SDR_ILLEGAL_COMMAND;
+ if (cardstatus & COM_CRC_ERROR)
+ status |= SSI_SDR_COM_CRC_ERROR;
+ if (cardstatus & ERASE_SEQ_ERROR)
+ status |= SSI_SDR_ERASE_SEQ_ERROR;
+ if (cardstatus & ADDRESS_ERROR)
+ status |= SSI_SDR_ADDRESS_ERROR;
+ if (cardstatus & CARD_IS_LOCKED)
+ status |= SSI_SDR_LOCKED;
+ if (cardstatus & (LOCK_UNLOCK_FAILED | WP_ERASE_SKIP))
+ status |= SSI_SDR_WP_ERASE;
+ if (cardstatus & SD_ERROR)
+ status |= SSI_SDR_ERROR;
+ if (cardstatus & CC_ERROR)
+ status |= SSI_SDR_CC_ERROR;
+ if (cardstatus & CARD_ECC_FAILED)
+ status |= SSI_SDR_ECC_FAILED;
+ if (cardstatus & WP_VIOLATION)
+ status |= SSI_SDR_WP_VIOLATION;
+ if (cardstatus & ERASE_PARAM)
+ status |= SSI_SDR_ERASE_PARAM;
+ if (cardstatus & (OUT_OF_RANGE | CID_CSD_OVERWRITE))
+ status |= SSI_SDR_OUT_OF_RANGE;
+ /* ??? Don't know what Parameter Error really means, so
+ assume it's set if the second byte is nonzero. */
+ if (status & 0xff)
+ status |= SSI_SDR_PARAMETER_ERROR;
+ s->response[0] = status >> 8;
+ s->response[1] = status;
+ DPRINTF("Card status 0x%02x\n", status);
+ }
+ s->mode = SSI_SD_RESPONSE;
+ s->response_pos = 0;
+ } else {
+ s->cmdarg[s->arglen++] = val;
+ }
+ return 0xff;
+ case SSI_SD_RESPONSE:
+ if (s->stopping) {
+ s->stopping = 0;
+ return 0xff;
+ }
+ if (s->response_pos < s->arglen) {
+ DPRINTF("Response 0x%02x\n", s->response[s->response_pos]);
+ return s->response[s->response_pos++];
+ }
+ if (sd_data_ready(s->sd)) {
+ DPRINTF("Data read\n");
+ s->mode = SSI_SD_DATA_START;
+ } else {
+ DPRINTF("End of command\n");
+ s->mode = SSI_SD_CMD;
+ }
+ return 0xff;
+ case SSI_SD_DATA_START:
+ DPRINTF("Start read block\n");
+ s->mode = SSI_SD_DATA_READ;
+ return 0xfe;
+ case SSI_SD_DATA_READ:
+ val = sd_read_data(s->sd);
+ if (!sd_data_ready(s->sd)) {
+ DPRINTF("Data read end\n");
+ s->mode = SSI_SD_CMD;
+ }
+ return val;
+ }
+ /* Should never happen. */
+ return 0xff;
+}
+
+void *ssi_sd_init(BlockDriverState *bs)
+{
+ ssi_sd_state *s;
+
+ s = (ssi_sd_state *)qemu_mallocz(sizeof(ssi_sd_state));
+ s->mode = SSI_SD_CMD;
+ s->sd = sd_init(bs, 1);
+ return s;
+}
+
