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