root / hw / ssi-sd.c @ 5c3234c6
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/*
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* SSI to SD card adapter.
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*
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* Copyright (c) 2007-2009 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the GNU GPL v2.
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*/
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#include "blockdev.h" |
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#include "ssi.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, ...) \
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do { printf("ssi_sd: " fmt , ## __VA_ARGS__); } while (0) |
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#define BADF(fmt, ...) \
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do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__); exit(1);} while (0) |
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#else
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#define DPRINTF(fmt, ...) do {} while(0) |
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#define BADF(fmt, ...) \
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do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_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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SSISlave ssidev; |
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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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static uint32_t ssi_sd_transfer(SSISlave *dev, uint32_t val)
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{ |
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ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev); |
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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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SDRequest 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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static void ssi_sd_save(QEMUFile *f, void *opaque) |
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{ |
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ssi_sd_state *s = (ssi_sd_state *)opaque; |
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int i;
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qemu_put_be32(f, s->mode); |
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qemu_put_be32(f, s->cmd); |
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for (i = 0; i < 4; i++) |
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qemu_put_be32(f, s->cmdarg[i]); |
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for (i = 0; i < 5; i++) |
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qemu_put_be32(f, s->response[i]); |
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qemu_put_be32(f, s->arglen); |
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qemu_put_be32(f, s->response_pos); |
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qemu_put_be32(f, s->stopping); |
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} |
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static int ssi_sd_load(QEMUFile *f, void *opaque, int version_id) |
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{ |
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ssi_sd_state *s = (ssi_sd_state *)opaque; |
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int i;
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if (version_id != 1) |
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return -EINVAL;
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s->mode = qemu_get_be32(f); |
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s->cmd = qemu_get_be32(f); |
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for (i = 0; i < 4; i++) |
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s->cmdarg[i] = qemu_get_be32(f); |
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for (i = 0; i < 5; i++) |
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s->response[i] = qemu_get_be32(f); |
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s->arglen = qemu_get_be32(f); |
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s->response_pos = qemu_get_be32(f); |
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s->stopping = qemu_get_be32(f); |
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return 0; |
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} |
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static int ssi_sd_init(SSISlave *dev) |
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{ |
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ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev); |
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DriveInfo *dinfo; |
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s->mode = SSI_SD_CMD; |
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dinfo = drive_get_next(IF_SD); |
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s->sd = sd_init(dinfo ? dinfo->bdrv : NULL, 1); |
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register_savevm(&dev->qdev, "ssi_sd", -1, 1, ssi_sd_save, ssi_sd_load, s); |
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return 0; |
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} |
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static SSISlaveInfo ssi_sd_info = {
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.qdev.name = "ssi-sd",
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.qdev.size = sizeof(ssi_sd_state),
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.init = ssi_sd_init, |
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.transfer = ssi_sd_transfer |
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}; |
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static void ssi_sd_register_devices(void) |
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{ |
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ssi_register_slave(&ssi_sd_info); |
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} |
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device_init(ssi_sd_register_devices) |