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1 /*
2  * Copyright 2011, Marvell Semiconductor Inc.
3  * Lei Wen <leiwen@marvell.com>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  *
7  * Back ported to the 8xx platform (from the 8260 platform) by
8  * Murray.Jensen@cmst.csiro.au, 27-Jan-01.
9  */
10
11 #include <common.h>
12 #include <malloc.h>
13 #include <mmc.h>
14 #include <sdhci.h>
15
16 void *aligned_buffer;
17
18 static void sdhci_reset(struct sdhci_host *host, u8 mask)
19 {
20         unsigned long timeout;
21
22         /* Wait max 100 ms */
23         timeout = 100;
24         sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
25         while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
26                 if (timeout == 0) {
27                         printf("%s: Reset 0x%x never completed.\n",
28                                __func__, (int)mask);
29                         return;
30                 }
31                 timeout--;
32                 udelay(1000);
33         }
34 }
35
36 static void sdhci_cmd_done(struct sdhci_host *host, struct mmc_cmd *cmd)
37 {
38         int i;
39         if (cmd->resp_type & MMC_RSP_136) {
40                 /* CRC is stripped so we need to do some shifting. */
41                 for (i = 0; i < 4; i++) {
42                         cmd->response[i] = sdhci_readl(host,
43                                         SDHCI_RESPONSE + (3-i)*4) << 8;
44                         if (i != 3)
45                                 cmd->response[i] |= sdhci_readb(host,
46                                                 SDHCI_RESPONSE + (3-i)*4-1);
47                 }
48         } else {
49                 cmd->response[0] = sdhci_readl(host, SDHCI_RESPONSE);
50         }
51 }
52
53 static void sdhci_transfer_pio(struct sdhci_host *host, struct mmc_data *data)
54 {
55         int i;
56         char *offs;
57         for (i = 0; i < data->blocksize; i += 4) {
58                 offs = data->dest + i;
59                 if (data->flags == MMC_DATA_READ)
60                         *(u32 *)offs = sdhci_readl(host, SDHCI_BUFFER);
61                 else
62                         sdhci_writel(host, *(u32 *)offs, SDHCI_BUFFER);
63         }
64 }
65
66 static int sdhci_transfer_data(struct sdhci_host *host, struct mmc_data *data,
67                                 unsigned int start_addr)
68 {
69         unsigned int stat, rdy, mask, timeout, block = 0;
70 #ifdef CONFIG_MMC_SDMA
71         unsigned char ctrl;
72         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
73         ctrl &= ~SDHCI_CTRL_DMA_MASK;
74         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
75 #endif
76
77         timeout = 1000000;
78         rdy = SDHCI_INT_SPACE_AVAIL | SDHCI_INT_DATA_AVAIL;
79         mask = SDHCI_DATA_AVAILABLE | SDHCI_SPACE_AVAILABLE;
80         do {
81                 stat = sdhci_readl(host, SDHCI_INT_STATUS);
82                 if (stat & SDHCI_INT_ERROR) {
83                         printf("%s: Error detected in status(0x%X)!\n",
84                                __func__, stat);
85                         return -1;
86                 }
87                 if (stat & rdy) {
88                         if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) & mask))
89                                 continue;
90                         sdhci_writel(host, rdy, SDHCI_INT_STATUS);
91                         sdhci_transfer_pio(host, data);
92                         data->dest += data->blocksize;
93                         if (++block >= data->blocks)
94                                 break;
95                 }
96 #ifdef CONFIG_MMC_SDMA
97                 if (stat & SDHCI_INT_DMA_END) {
98                         sdhci_writel(host, SDHCI_INT_DMA_END, SDHCI_INT_STATUS);
99                         start_addr &= ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1);
100                         start_addr += SDHCI_DEFAULT_BOUNDARY_SIZE;
101                         sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
102                 }
103 #endif
104                 if (timeout-- > 0)
105                         udelay(10);
106                 else {
107                         printf("%s: Transfer data timeout\n", __func__);
108                         return -1;
109                 }
110         } while (!(stat & SDHCI_INT_DATA_END));
111         return 0;
112 }
113
114 /*
115  * No command will be sent by driver if card is busy, so driver must wait
116  * for card ready state.
117  * Every time when card is busy after timeout then (last) timeout value will be
118  * increased twice but only if it doesn't exceed global defined maximum.
119  * Each function call will use last timeout value. Max timeout can be redefined
120  * in board config file.
121  */
122 #ifndef CONFIG_SDHCI_CMD_MAX_TIMEOUT
123 #define CONFIG_SDHCI_CMD_MAX_TIMEOUT            3200
124 #endif
125 #define CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT        100
126
127 int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
128                        struct mmc_data *data)
129 {
130         struct sdhci_host *host = mmc->priv;
131         unsigned int stat = 0;
132         int ret = 0;
133         int trans_bytes = 0, is_aligned = 1;
134         u32 mask, flags, mode;
135         unsigned int time = 0, start_addr = 0;
136         unsigned int retry = 10000;
137         int mmc_dev = mmc->block_dev.dev;
138
139         /* Timeout unit - ms */
140         static unsigned int cmd_timeout = CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT;
141
142         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
143         mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT;
144
145         /* We shouldn't wait for data inihibit for stop commands, even
146            though they might use busy signaling */
147         if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
148                 mask &= ~SDHCI_DATA_INHIBIT;
149
150         while (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask) {
151                 if (time >= cmd_timeout) {
152                         printf("%s: MMC: %d busy ", __func__, mmc_dev);
153                         if (2 * cmd_timeout <= CONFIG_SDHCI_CMD_MAX_TIMEOUT) {
154                                 cmd_timeout += cmd_timeout;
155                                 printf("timeout increasing to: %u ms.\n",
156                                        cmd_timeout);
157                         } else {
158                                 puts("timeout.\n");
159                                 return COMM_ERR;
160                         }
161                 }
162                 time++;
163                 udelay(1000);
164         }
165
166         mask = SDHCI_INT_RESPONSE;
167         if (!(cmd->resp_type & MMC_RSP_PRESENT))
168                 flags = SDHCI_CMD_RESP_NONE;
169         else if (cmd->resp_type & MMC_RSP_136)
170                 flags = SDHCI_CMD_RESP_LONG;
171         else if (cmd->resp_type & MMC_RSP_BUSY) {
172                 flags = SDHCI_CMD_RESP_SHORT_BUSY;
173                 mask |= SDHCI_INT_DATA_END;
174         } else
175                 flags = SDHCI_CMD_RESP_SHORT;
176
177         if (cmd->resp_type & MMC_RSP_CRC)
178                 flags |= SDHCI_CMD_CRC;
179         if (cmd->resp_type & MMC_RSP_OPCODE)
180                 flags |= SDHCI_CMD_INDEX;
181         if (data)
182                 flags |= SDHCI_CMD_DATA;
183
184         /* Set Transfer mode regarding to data flag */
185         if (data != 0) {
186                 sdhci_writeb(host, 0xe, SDHCI_TIMEOUT_CONTROL);
187                 mode = SDHCI_TRNS_BLK_CNT_EN;
188                 trans_bytes = data->blocks * data->blocksize;
189                 if (data->blocks > 1)
190                         mode |= SDHCI_TRNS_MULTI;
191
192                 if (data->flags == MMC_DATA_READ)
193                         mode |= SDHCI_TRNS_READ;
194
195 #ifdef CONFIG_MMC_SDMA
196                 if (data->flags == MMC_DATA_READ)
197                         start_addr = (unsigned int)data->dest;
198                 else
199                         start_addr = (unsigned int)data->src;
200                 if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
201                                 (start_addr & 0x7) != 0x0) {
202                         is_aligned = 0;
203                         start_addr = (unsigned int)aligned_buffer;
204                         if (data->flags != MMC_DATA_READ)
205                                 memcpy(aligned_buffer, data->src, trans_bytes);
206                 }
207
208                 sdhci_writel(host, start_addr, SDHCI_DMA_ADDRESS);
209                 mode |= SDHCI_TRNS_DMA;
210 #endif
211                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
212                                 data->blocksize),
213                                 SDHCI_BLOCK_SIZE);
214                 sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
215                 sdhci_writew(host, mode, SDHCI_TRANSFER_MODE);
216         }
217
218         sdhci_writel(host, cmd->cmdarg, SDHCI_ARGUMENT);
219 #ifdef CONFIG_MMC_SDMA
220         flush_cache(start_addr, trans_bytes);
221 #endif
222         sdhci_writew(host, SDHCI_MAKE_CMD(cmd->cmdidx, flags), SDHCI_COMMAND);
223         do {
224                 stat = sdhci_readl(host, SDHCI_INT_STATUS);
225                 if (stat & SDHCI_INT_ERROR)
226                         break;
227                 if (--retry == 0)
228                         break;
229         } while ((stat & mask) != mask);
230
231         if (retry == 0) {
232                 if (host->quirks & SDHCI_QUIRK_BROKEN_R1B)
233                         return 0;
234                 else {
235                         printf("%s: Timeout for status update!\n", __func__);
236                         return TIMEOUT;
237                 }
238         }
239
240         if ((stat & (SDHCI_INT_ERROR | mask)) == mask) {
241                 sdhci_cmd_done(host, cmd);
242                 sdhci_writel(host, mask, SDHCI_INT_STATUS);
243         } else
244                 ret = -1;
245
246         if (!ret && data)
247                 ret = sdhci_transfer_data(host, data, start_addr);
248
249         if (host->quirks & SDHCI_QUIRK_WAIT_SEND_CMD)
250                 udelay(1000);
251
252         stat = sdhci_readl(host, SDHCI_INT_STATUS);
253         sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
254         if (!ret) {
255                 if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
256                                 !is_aligned && (data->flags == MMC_DATA_READ))
257                         memcpy(data->dest, aligned_buffer, trans_bytes);
258                 return 0;
259         }
260
261         sdhci_reset(host, SDHCI_RESET_CMD);
262         sdhci_reset(host, SDHCI_RESET_DATA);
263         if (stat & SDHCI_INT_TIMEOUT)
264                 return TIMEOUT;
265         else
266                 return COMM_ERR;
267 }
268
269 static int sdhci_set_clock(struct mmc *mmc, unsigned int clock)
270 {
271         struct sdhci_host *host = mmc->priv;
272         unsigned int div, clk, timeout;
273
274         sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
275
276         if (clock == 0)
277                 return 0;
278
279         if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
280                 /* Version 3.00 divisors must be a multiple of 2. */
281                 if (mmc->cfg->f_max <= clock)
282                         div = 1;
283                 else {
284                         for (div = 2; div < SDHCI_MAX_DIV_SPEC_300; div += 2) {
285                                 if ((mmc->cfg->f_max / div) <= clock)
286                                         break;
287                         }
288                 }
289         } else {
290                 /* Version 2.00 divisors must be a power of 2. */
291                 for (div = 1; div < SDHCI_MAX_DIV_SPEC_200; div *= 2) {
292                         if ((mmc->cfg->f_max / div) <= clock)
293                                 break;
294                 }
295         }
296         div >>= 1;
297
298         if (host->set_clock)
299                 host->set_clock(host->index, div);
300
301         clk = (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
302         clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
303                 << SDHCI_DIVIDER_HI_SHIFT;
304         clk |= SDHCI_CLOCK_INT_EN;
305         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
306
307         /* Wait max 20 ms */
308         timeout = 20;
309         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
310                 & SDHCI_CLOCK_INT_STABLE)) {
311                 if (timeout == 0) {
312                         printf("%s: Internal clock never stabilised.\n",
313                                __func__);
314                         return -1;
315                 }
316                 timeout--;
317                 udelay(1000);
318         }
319
320         clk |= SDHCI_CLOCK_CARD_EN;
321         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
322         return 0;
323 }
324
325 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
326 {
327         u8 pwr = 0;
328
329         if (power != (unsigned short)-1) {
330                 switch (1 << power) {
331                 case MMC_VDD_165_195:
332                         pwr = SDHCI_POWER_180;
333                         break;
334                 case MMC_VDD_29_30:
335                 case MMC_VDD_30_31:
336                         pwr = SDHCI_POWER_300;
337                         break;
338                 case MMC_VDD_32_33:
339                 case MMC_VDD_33_34:
340                         pwr = SDHCI_POWER_330;
341                         break;
342                 }
343         }
344
345         if (pwr == 0) {
346                 sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
347                 return;
348         }
349
350         if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
351                 sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
352
353         pwr |= SDHCI_POWER_ON;
354
355         sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
356 }
357
358 void sdhci_set_ios(struct mmc *mmc)
359 {
360         u32 ctrl;
361         struct sdhci_host *host = mmc->priv;
362
363         if (host->set_control_reg)
364                 host->set_control_reg(host);
365
366         if (mmc->clock != host->clock)
367                 sdhci_set_clock(mmc, mmc->clock);
368
369         /* Set bus width */
370         ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
371         if (mmc->bus_width == 8) {
372                 ctrl &= ~SDHCI_CTRL_4BITBUS;
373                 if ((SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) ||
374                                 (host->quirks & SDHCI_QUIRK_USE_WIDE8))
375                         ctrl |= SDHCI_CTRL_8BITBUS;
376         } else {
377                 if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
378                         ctrl &= ~SDHCI_CTRL_8BITBUS;
379                 if (mmc->bus_width == 4)
380                         ctrl |= SDHCI_CTRL_4BITBUS;
381                 else
382                         ctrl &= ~SDHCI_CTRL_4BITBUS;
383         }
384
385         if (mmc->clock > 26000000)
386                 ctrl |= SDHCI_CTRL_HISPD;
387         else
388                 ctrl &= ~SDHCI_CTRL_HISPD;
389
390         if (host->quirks & SDHCI_QUIRK_NO_HISPD_BIT)
391                 ctrl &= ~SDHCI_CTRL_HISPD;
392
393         sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
394 }
395
396 int sdhci_init(struct mmc *mmc)
397 {
398         struct sdhci_host *host = mmc->priv;
399
400         if ((host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) && !aligned_buffer) {
401                 aligned_buffer = memalign(8, 512*1024);
402                 if (!aligned_buffer) {
403                         printf("%s: Aligned buffer alloc failed!!!\n",
404                                __func__);
405                         return -1;
406                 }
407         }
408
409         sdhci_set_power(host, fls(mmc->cfg->voltages) - 1);
410
411         if (host->quirks & SDHCI_QUIRK_NO_CD) {
412                 unsigned int status;
413
414                 sdhci_writel(host, SDHCI_CTRL_CD_TEST_INS | SDHCI_CTRL_CD_TEST,
415                         SDHCI_HOST_CONTROL);
416
417                 status = sdhci_readl(host, SDHCI_PRESENT_STATE);
418                 while ((!(status & SDHCI_CARD_PRESENT)) ||
419                     (!(status & SDHCI_CARD_STATE_STABLE)) ||
420                     (!(status & SDHCI_CARD_DETECT_PIN_LEVEL)))
421                         status = sdhci_readl(host, SDHCI_PRESENT_STATE);
422         }
423
424         /* Enable only interrupts served by the SD controller */
425         sdhci_writel(host, SDHCI_INT_DATA_MASK | SDHCI_INT_CMD_MASK,
426                      SDHCI_INT_ENABLE);
427         /* Mask all sdhci interrupt sources */
428         sdhci_writel(host, 0x0, SDHCI_SIGNAL_ENABLE);
429
430         return 0;
431 }
432
433
434 static const struct mmc_ops sdhci_ops = {
435         .send_cmd       = sdhci_send_command,
436         .set_ios        = sdhci_set_ios,
437         .init           = sdhci_init,
438 };
439
440 int add_sdhci(struct sdhci_host *host, u32 max_clk, u32 min_clk)
441 {
442         unsigned int caps;
443
444         host->cfg.name = host->name;
445         host->cfg.ops = &sdhci_ops;
446
447         caps = sdhci_readl(host, SDHCI_CAPABILITIES);
448 #ifdef CONFIG_MMC_SDMA
449         if (!(caps & SDHCI_CAN_DO_SDMA)) {
450                 printf("%s: Your controller doesn't support SDMA!!\n",
451                        __func__);
452                 return -1;
453         }
454 #endif
455
456         if (max_clk)
457                 host->cfg.f_max = max_clk;
458         else {
459                 if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
460                         host->cfg.f_max = (caps & SDHCI_CLOCK_V3_BASE_MASK)
461                                 >> SDHCI_CLOCK_BASE_SHIFT;
462                 else
463                         host->cfg.f_max = (caps & SDHCI_CLOCK_BASE_MASK)
464                                 >> SDHCI_CLOCK_BASE_SHIFT;
465                 host->cfg.f_max *= 1000000;
466         }
467         if (host->cfg.f_max == 0) {
468                 printf("%s: Hardware doesn't specify base clock frequency\n",
469                        __func__);
470                 return -1;
471         }
472         if (min_clk)
473                 host->cfg.f_min = min_clk;
474         else {
475                 if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
476                         host->cfg.f_min = host->cfg.f_max /
477                                 SDHCI_MAX_DIV_SPEC_300;
478                 else
479                         host->cfg.f_min = host->cfg.f_max /
480                                 SDHCI_MAX_DIV_SPEC_200;
481         }
482
483         host->cfg.voltages = 0;
484         if (caps & SDHCI_CAN_VDD_330)
485                 host->cfg.voltages |= MMC_VDD_32_33 | MMC_VDD_33_34;
486         if (caps & SDHCI_CAN_VDD_300)
487                 host->cfg.voltages |= MMC_VDD_29_30 | MMC_VDD_30_31;
488         if (caps & SDHCI_CAN_VDD_180)
489                 host->cfg.voltages |= MMC_VDD_165_195;
490
491         if (host->quirks & SDHCI_QUIRK_BROKEN_VOLTAGE)
492                 host->cfg.voltages |= host->voltages;
493
494         host->cfg.host_caps = MMC_MODE_HS | MMC_MODE_HS_52MHz | MMC_MODE_4BIT;
495         if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) {
496                 if (caps & SDHCI_CAN_DO_8BIT)
497                         host->cfg.host_caps |= MMC_MODE_8BIT;
498         }
499         if (host->host_caps)
500                 host->cfg.host_caps |= host->host_caps;
501
502         host->cfg.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
503
504         sdhci_reset(host, SDHCI_RESET_ALL);
505
506         host->mmc = mmc_create(&host->cfg, host);
507         if (host->mmc == NULL) {
508                 printf("%s: mmc create fail!\n", __func__);
509                 return -1;
510         }
511
512         return 0;
513 }