2 * SSI to SD card adapter.
4 * Copyright (c) 2007-2009 CodeSourcery.
5 * Written by Paul Brook
7 * This code is licenced under the GNU GPL v2.
14 //#define DEBUG_SSI_SD 1
17 #define DPRINTF(fmt, ...) \
18 do { printf("ssi_sd: " fmt , ## __VA_ARGS__); } while (0)
19 #define BADF(fmt, ...) \
20 do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
22 #define DPRINTF(fmt, ...) do {} while(0)
23 #define BADF(fmt, ...) \
24 do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__);} while (0)
47 /* State word bits. */
48 #define SSI_SDR_LOCKED 0x0001
49 #define SSI_SDR_WP_ERASE 0x0002
50 #define SSI_SDR_ERROR 0x0004
51 #define SSI_SDR_CC_ERROR 0x0008
52 #define SSI_SDR_ECC_FAILED 0x0010
53 #define SSI_SDR_WP_VIOLATION 0x0020
54 #define SSI_SDR_ERASE_PARAM 0x0040
55 #define SSI_SDR_OUT_OF_RANGE 0x0080
56 #define SSI_SDR_IDLE 0x0100
57 #define SSI_SDR_ERASE_RESET 0x0200
58 #define SSI_SDR_ILLEGAL_COMMAND 0x0400
59 #define SSI_SDR_COM_CRC_ERROR 0x0800
60 #define SSI_SDR_ERASE_SEQ_ERROR 0x1000
61 #define SSI_SDR_ADDRESS_ERROR 0x2000
62 #define SSI_SDR_PARAMETER_ERROR 0x4000
64 static uint32_t ssi_sd_transfer(SSISlave *dev, uint32_t val)
66 ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev);
68 /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data. */
69 if (s->mode == SSI_SD_DATA_READ && val == 0x4d) {
71 /* There must be at least one byte delay before the card responds. */
78 DPRINTF("NULL command\n");
82 s->mode = SSI_SD_CMDARG;
89 /* FIXME: Check CRC. */
91 request.arg = (s->cmdarg[0] << 24) | (s->cmdarg[1] << 16)
92 | (s->cmdarg[2] << 8) | s->cmdarg[3];
93 DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg);
94 s->arglen = sd_do_command(s->sd, &request, longresp);
98 DPRINTF("SD command failed\n");
99 } else if (s->cmd == 58) {
100 /* CMD58 returns R3 response (OCR) */
101 DPRINTF("Returned OCR\n");
104 memcpy(&s->response[1], longresp, 4);
105 } else if (s->arglen != 4) {
106 BADF("Unexpected response to cmd %d\n", s->cmd);
107 /* Illegal command is about as near as we can get. */
111 /* All other commands return status. */
114 /* CMD13 returns a 2-byte statuse work. Other commands
115 only return the first byte. */
116 s->arglen = (s->cmd == 13) ? 2 : 1;
117 cardstatus = (longresp[0] << 24) | (longresp[1] << 16)
118 | (longresp[2] << 8) | longresp[3];
120 if (((cardstatus >> 9) & 0xf) < 4)
121 status |= SSI_SDR_IDLE;
122 if (cardstatus & ERASE_RESET)
123 status |= SSI_SDR_ERASE_RESET;
124 if (cardstatus & ILLEGAL_COMMAND)
125 status |= SSI_SDR_ILLEGAL_COMMAND;
126 if (cardstatus & COM_CRC_ERROR)
127 status |= SSI_SDR_COM_CRC_ERROR;
128 if (cardstatus & ERASE_SEQ_ERROR)
129 status |= SSI_SDR_ERASE_SEQ_ERROR;
130 if (cardstatus & ADDRESS_ERROR)
131 status |= SSI_SDR_ADDRESS_ERROR;
132 if (cardstatus & CARD_IS_LOCKED)
133 status |= SSI_SDR_LOCKED;
134 if (cardstatus & (LOCK_UNLOCK_FAILED | WP_ERASE_SKIP))
135 status |= SSI_SDR_WP_ERASE;
136 if (cardstatus & SD_ERROR)
137 status |= SSI_SDR_ERROR;
138 if (cardstatus & CC_ERROR)
139 status |= SSI_SDR_CC_ERROR;
140 if (cardstatus & CARD_ECC_FAILED)
141 status |= SSI_SDR_ECC_FAILED;
142 if (cardstatus & WP_VIOLATION)
143 status |= SSI_SDR_WP_VIOLATION;
144 if (cardstatus & ERASE_PARAM)
145 status |= SSI_SDR_ERASE_PARAM;
146 if (cardstatus & (OUT_OF_RANGE | CID_CSD_OVERWRITE))
147 status |= SSI_SDR_OUT_OF_RANGE;
148 /* ??? Don't know what Parameter Error really means, so
149 assume it's set if the second byte is nonzero. */
151 status |= SSI_SDR_PARAMETER_ERROR;
152 s->response[0] = status >> 8;
153 s->response[1] = status;
154 DPRINTF("Card status 0x%02x\n", status);
156 s->mode = SSI_SD_RESPONSE;
159 s->cmdarg[s->arglen++] = val;
162 case SSI_SD_RESPONSE:
167 if (s->response_pos < s->arglen) {
168 DPRINTF("Response 0x%02x\n", s->response[s->response_pos]);
169 return s->response[s->response_pos++];
171 if (sd_data_ready(s->sd)) {
172 DPRINTF("Data read\n");
173 s->mode = SSI_SD_DATA_START;
175 DPRINTF("End of command\n");
176 s->mode = SSI_SD_CMD;
179 case SSI_SD_DATA_START:
180 DPRINTF("Start read block\n");
181 s->mode = SSI_SD_DATA_READ;
183 case SSI_SD_DATA_READ:
184 val = sd_read_data(s->sd);
185 if (!sd_data_ready(s->sd)) {
186 DPRINTF("Data read end\n");
187 s->mode = SSI_SD_CMD;
191 /* Should never happen. */
195 static void ssi_sd_save(QEMUFile *f, void *opaque)
197 ssi_sd_state *s = (ssi_sd_state *)opaque;
200 qemu_put_be32(f, s->mode);
201 qemu_put_be32(f, s->cmd);
202 for (i = 0; i < 4; i++)
203 qemu_put_be32(f, s->cmdarg[i]);
204 for (i = 0; i < 5; i++)
205 qemu_put_be32(f, s->response[i]);
206 qemu_put_be32(f, s->arglen);
207 qemu_put_be32(f, s->response_pos);
208 qemu_put_be32(f, s->stopping);
211 static int ssi_sd_load(QEMUFile *f, void *opaque, int version_id)
213 ssi_sd_state *s = (ssi_sd_state *)opaque;
219 s->mode = qemu_get_be32(f);
220 s->cmd = qemu_get_be32(f);
221 for (i = 0; i < 4; i++)
222 s->cmdarg[i] = qemu_get_be32(f);
223 for (i = 0; i < 5; i++)
224 s->response[i] = qemu_get_be32(f);
225 s->arglen = qemu_get_be32(f);
226 s->response_pos = qemu_get_be32(f);
227 s->stopping = qemu_get_be32(f);
232 static int ssi_sd_init(SSISlave *dev)
234 ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev);
237 s->mode = SSI_SD_CMD;
238 dinfo = drive_get_next(IF_SD);
239 s->sd = sd_init(dinfo ? dinfo->bdrv : NULL, 1);
240 register_savevm(&dev->qdev, "ssi_sd", -1, 1, ssi_sd_save, ssi_sd_load, s);
244 static SSISlaveInfo ssi_sd_info = {
245 .qdev.name = "ssi-sd",
246 .qdev.size = sizeof(ssi_sd_state),
248 .transfer = ssi_sd_transfer
251 static void ssi_sd_register_devices(void)
253 ssi_register_slave(&ssi_sd_info);
256 device_init(ssi_sd_register_devices)