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[u-boot] / drivers / mmc / mmc_spi.c
1 /*
2  * generic mmc spi driver
3  *
4  * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
5  * Licensed under the GPL-2 or later.
6  */
7 #include <common.h>
8 #include <errno.h>
9 #include <malloc.h>
10 #include <part.h>
11 #include <mmc.h>
12 #include <spi.h>
13 #include <crc.h>
14 #include <linux/crc7.h>
15 #include <asm/byteorder.h>
16
17 /* MMC/SD in SPI mode reports R1 status always */
18 #define R1_SPI_IDLE             (1 << 0)
19 #define R1_SPI_ERASE_RESET      (1 << 1)
20 #define R1_SPI_ILLEGAL_COMMAND  (1 << 2)
21 #define R1_SPI_COM_CRC          (1 << 3)
22 #define R1_SPI_ERASE_SEQ        (1 << 4)
23 #define R1_SPI_ADDRESS          (1 << 5)
24 #define R1_SPI_PARAMETER        (1 << 6)
25 /* R1 bit 7 is always zero, reuse this bit for error */
26 #define R1_SPI_ERROR            (1 << 7)
27
28 /* Response tokens used to ack each block written: */
29 #define SPI_MMC_RESPONSE_CODE(x)        ((x) & 0x1f)
30 #define SPI_RESPONSE_ACCEPTED           ((2 << 1)|1)
31 #define SPI_RESPONSE_CRC_ERR            ((5 << 1)|1)
32 #define SPI_RESPONSE_WRITE_ERR          ((6 << 1)|1)
33
34 /* Read and write blocks start with these tokens and end with crc;
35  * on error, read tokens act like a subset of R2_SPI_* values.
36  */
37 #define SPI_TOKEN_SINGLE        0xfe    /* single block r/w, multiblock read */
38 #define SPI_TOKEN_MULTI_WRITE   0xfc    /* multiblock write */
39 #define SPI_TOKEN_STOP_TRAN     0xfd    /* terminate multiblock write */
40
41 /* MMC SPI commands start with a start bit "0" and a transmit bit "1" */
42 #define MMC_SPI_CMD(x) (0x40 | (x & 0x3f))
43
44 /* bus capability */
45 #define MMC_SPI_VOLTAGE (MMC_VDD_32_33 | MMC_VDD_33_34)
46 #define MMC_SPI_MIN_CLOCK 400000 /* 400KHz to meet MMC spec */
47
48 /* timeout value */
49 #define CTOUT 8
50 #define RTOUT 3000000 /* 1 sec */
51 #define WTOUT 3000000 /* 1 sec */
52
53 static uint mmc_spi_sendcmd(struct mmc *mmc, ushort cmdidx, u32 cmdarg)
54 {
55         struct spi_slave *spi = mmc->priv;
56         u8 cmdo[7];
57         u8 r1;
58         int i;
59         cmdo[0] = 0xff;
60         cmdo[1] = MMC_SPI_CMD(cmdidx);
61         cmdo[2] = cmdarg >> 24;
62         cmdo[3] = cmdarg >> 16;
63         cmdo[4] = cmdarg >> 8;
64         cmdo[5] = cmdarg;
65         cmdo[6] = (crc7(0, &cmdo[1], 5) << 1) | 0x01;
66         spi_xfer(spi, sizeof(cmdo) * 8, cmdo, NULL, 0);
67         for (i = 0; i < CTOUT; i++) {
68                 spi_xfer(spi, 1 * 8, NULL, &r1, 0);
69                 if (i && (r1 & 0x80) == 0) /* r1 response */
70                         break;
71         }
72         debug("%s:cmd%d resp%d %x\n", __func__, cmdidx, i, r1);
73         return r1;
74 }
75
76 static uint mmc_spi_readdata(struct mmc *mmc, void *xbuf,
77                                 u32 bcnt, u32 bsize)
78 {
79         struct spi_slave *spi = mmc->priv;
80         u8 *buf = xbuf;
81         u8 r1;
82         u16 crc;
83         int i;
84         while (bcnt--) {
85                 for (i = 0; i < RTOUT; i++) {
86                         spi_xfer(spi, 1 * 8, NULL, &r1, 0);
87                         if (r1 != 0xff) /* data token */
88                                 break;
89                 }
90                 debug("%s:tok%d %x\n", __func__, i, r1);
91                 if (r1 == SPI_TOKEN_SINGLE) {
92                         spi_xfer(spi, bsize * 8, NULL, buf, 0);
93                         spi_xfer(spi, 2 * 8, NULL, &crc, 0);
94 #ifdef CONFIG_MMC_SPI_CRC_ON
95                         if (be_to_cpu16(crc16_ccitt(0, buf, bsize)) != crc) {
96                                 debug("%s: CRC error\n", mmc->cfg->name);
97                                 r1 = R1_SPI_COM_CRC;
98                                 break;
99                         }
100 #endif
101                         r1 = 0;
102                 } else {
103                         r1 = R1_SPI_ERROR;
104                         break;
105                 }
106                 buf += bsize;
107         }
108         return r1;
109 }
110
111 static uint mmc_spi_writedata(struct mmc *mmc, const void *xbuf,
112                               u32 bcnt, u32 bsize, int multi)
113 {
114         struct spi_slave *spi = mmc->priv;
115         const u8 *buf = xbuf;
116         u8 r1;
117         u16 crc;
118         u8 tok[2];
119         int i;
120         tok[0] = 0xff;
121         tok[1] = multi ? SPI_TOKEN_MULTI_WRITE : SPI_TOKEN_SINGLE;
122         while (bcnt--) {
123 #ifdef CONFIG_MMC_SPI_CRC_ON
124                 crc = cpu_to_be16(crc16_ccitt(0, (u8 *)buf, bsize));
125 #endif
126                 spi_xfer(spi, 2 * 8, tok, NULL, 0);
127                 spi_xfer(spi, bsize * 8, buf, NULL, 0);
128                 spi_xfer(spi, 2 * 8, &crc, NULL, 0);
129                 for (i = 0; i < CTOUT; i++) {
130                         spi_xfer(spi, 1 * 8, NULL, &r1, 0);
131                         if ((r1 & 0x10) == 0) /* response token */
132                                 break;
133                 }
134                 debug("%s:tok%d %x\n", __func__, i, r1);
135                 if (SPI_MMC_RESPONSE_CODE(r1) == SPI_RESPONSE_ACCEPTED) {
136                         for (i = 0; i < WTOUT; i++) { /* wait busy */
137                                 spi_xfer(spi, 1 * 8, NULL, &r1, 0);
138                                 if (i && r1 == 0xff) {
139                                         r1 = 0;
140                                         break;
141                                 }
142                         }
143                         if (i == WTOUT) {
144                                 debug("%s:wtout %x\n", __func__, r1);
145                                 r1 = R1_SPI_ERROR;
146                                 break;
147                         }
148                 } else {
149                         debug("%s: err %x\n", __func__, r1);
150                         r1 = R1_SPI_COM_CRC;
151                         break;
152                 }
153                 buf += bsize;
154         }
155         if (multi && bcnt == -1) { /* stop multi write */
156                 tok[1] = SPI_TOKEN_STOP_TRAN;
157                 spi_xfer(spi, 2 * 8, tok, NULL, 0);
158                 for (i = 0; i < WTOUT; i++) { /* wait busy */
159                         spi_xfer(spi, 1 * 8, NULL, &r1, 0);
160                         if (i && r1 == 0xff) {
161                                 r1 = 0;
162                                 break;
163                         }
164                 }
165                 if (i == WTOUT) {
166                         debug("%s:wstop %x\n", __func__, r1);
167                         r1 = R1_SPI_ERROR;
168                 }
169         }
170         return r1;
171 }
172
173 static int mmc_spi_request(struct mmc *mmc, struct mmc_cmd *cmd,
174                 struct mmc_data *data)
175 {
176         struct spi_slave *spi = mmc->priv;
177         u8 r1;
178         int i;
179         int ret = 0;
180         debug("%s:cmd%d %x %x\n", __func__,
181               cmd->cmdidx, cmd->resp_type, cmd->cmdarg);
182         spi_claim_bus(spi);
183         spi_cs_activate(spi);
184         r1 = mmc_spi_sendcmd(mmc, cmd->cmdidx, cmd->cmdarg);
185         if (r1 == 0xff) { /* no response */
186                 ret = -ENOMEDIUM;
187                 goto done;
188         } else if (r1 & R1_SPI_COM_CRC) {
189                 ret = -ECOMM;
190                 goto done;
191         } else if (r1 & ~R1_SPI_IDLE) { /* other errors */
192                 ret = -ETIMEDOUT;
193                 goto done;
194         } else if (cmd->resp_type == MMC_RSP_R2) {
195                 r1 = mmc_spi_readdata(mmc, cmd->response, 1, 16);
196                 for (i = 0; i < 4; i++)
197                         cmd->response[i] = be32_to_cpu(cmd->response[i]);
198                 debug("r128 %x %x %x %x\n", cmd->response[0], cmd->response[1],
199                       cmd->response[2], cmd->response[3]);
200         } else if (!data) {
201                 switch (cmd->cmdidx) {
202                 case SD_CMD_APP_SEND_OP_COND:
203                 case MMC_CMD_SEND_OP_COND:
204                         cmd->response[0] = (r1 & R1_SPI_IDLE) ? 0 : OCR_BUSY;
205                         break;
206                 case SD_CMD_SEND_IF_COND:
207                 case MMC_CMD_SPI_READ_OCR:
208                         spi_xfer(spi, 4 * 8, NULL, cmd->response, 0);
209                         cmd->response[0] = be32_to_cpu(cmd->response[0]);
210                         debug("r32 %x\n", cmd->response[0]);
211                         break;
212                 case MMC_CMD_SEND_STATUS:
213                         spi_xfer(spi, 1 * 8, NULL, cmd->response, 0);
214                         cmd->response[0] = (cmd->response[0] & 0xff) ?
215                                 MMC_STATUS_ERROR : MMC_STATUS_RDY_FOR_DATA;
216                         break;
217                 }
218         } else {
219                 debug("%s:data %x %x %x\n", __func__,
220                       data->flags, data->blocks, data->blocksize);
221                 if (data->flags == MMC_DATA_READ)
222                         r1 = mmc_spi_readdata(mmc, data->dest,
223                                 data->blocks, data->blocksize);
224                 else if  (data->flags == MMC_DATA_WRITE)
225                         r1 = mmc_spi_writedata(mmc, data->src,
226                                 data->blocks, data->blocksize,
227                                 (cmd->cmdidx == MMC_CMD_WRITE_MULTIPLE_BLOCK));
228                 if (r1 & R1_SPI_COM_CRC)
229                         ret = -ECOMM;
230                 else if (r1) /* other errors */
231                         ret = -ETIMEDOUT;
232         }
233 done:
234         spi_cs_deactivate(spi);
235         spi_release_bus(spi);
236         return ret;
237 }
238
239 static int mmc_spi_set_ios(struct mmc *mmc)
240 {
241         struct spi_slave *spi = mmc->priv;
242
243         debug("%s: clock %u\n", __func__, mmc->clock);
244         if (mmc->clock)
245                 spi_set_speed(spi, mmc->clock);
246         return 0;
247 }
248
249 static int mmc_spi_init_p(struct mmc *mmc)
250 {
251         struct spi_slave *spi = mmc->priv;
252         spi_set_speed(spi, MMC_SPI_MIN_CLOCK);
253         spi_claim_bus(spi);
254         /* cs deactivated for 100+ clock */
255         spi_xfer(spi, 18 * 8, NULL, NULL, 0);
256         spi_release_bus(spi);
257         return 0;
258 }
259
260 static const struct mmc_ops mmc_spi_ops = {
261         .send_cmd       = mmc_spi_request,
262         .set_ios        = mmc_spi_set_ios,
263         .init           = mmc_spi_init_p,
264 };
265
266 static struct mmc_config mmc_spi_cfg = {
267         .name           = "MMC_SPI",
268         .ops            = &mmc_spi_ops,
269         .host_caps      = MMC_MODE_SPI,
270         .voltages       = MMC_SPI_VOLTAGE,
271         .f_min          = MMC_SPI_MIN_CLOCK,
272         .part_type      = PART_TYPE_DOS,
273         .b_max          = CONFIG_SYS_MMC_MAX_BLK_COUNT,
274 };
275
276 struct mmc *mmc_spi_init(uint bus, uint cs, uint speed, uint mode)
277 {
278         struct mmc *mmc;
279         struct spi_slave *spi;
280
281         spi = spi_setup_slave(bus, cs, speed, mode);
282         if (spi == NULL)
283                 return NULL;
284
285         mmc_spi_cfg.f_max = speed;
286
287         mmc = mmc_create(&mmc_spi_cfg, spi);
288         if (mmc == NULL) {
289                 spi_free_slave(spi);
290                 return NULL;
291         }
292         return mmc;
293 }