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15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/io.h>
18#include <linux/device.h>
19#include <linux/interrupt.h>
20#include <linux/delay.h>
21#include <linux/err.h>
22
23#include <linux/clk.h>
24#include <linux/gpio.h>
25#include <linux/platform_device.h>
26#include <linux/spinlock.h>
27#include <linux/scatterlist.h>
28#include <linux/dma-mapping.h>
29#include <linux/slab.h>
30#include <linux/reset.h>
31
32#include <linux/of_address.h>
33#include <linux/of_gpio.h>
34#include <linux/of_platform.h>
35
36#include <linux/mmc/host.h>
37#include <linux/mmc/sd.h>
38#include <linux/mmc/sdio.h>
39#include <linux/mmc/mmc.h>
40#include <linux/mmc/core.h>
41#include <linux/mmc/card.h>
42#include <linux/mmc/slot-gpio.h>
43
44
45#define SDXC_REG_GCTRL (0x00)
46#define SDXC_REG_CLKCR (0x04)
47#define SDXC_REG_TMOUT (0x08)
48#define SDXC_REG_WIDTH (0x0C)
49#define SDXC_REG_BLKSZ (0x10)
50#define SDXC_REG_BCNTR (0x14)
51#define SDXC_REG_CMDR (0x18)
52#define SDXC_REG_CARG (0x1C)
53#define SDXC_REG_RESP0 (0x20)
54#define SDXC_REG_RESP1 (0x24)
55#define SDXC_REG_RESP2 (0x28)
56#define SDXC_REG_RESP3 (0x2C)
57#define SDXC_REG_IMASK (0x30)
58#define SDXC_REG_MISTA (0x34)
59#define SDXC_REG_RINTR (0x38)
60#define SDXC_REG_STAS (0x3C)
61#define SDXC_REG_FTRGL (0x40)
62#define SDXC_REG_FUNS (0x44)
63#define SDXC_REG_CBCR (0x48)
64#define SDXC_REG_BBCR (0x4C)
65#define SDXC_REG_DBGC (0x50)
66#define SDXC_REG_HWRST (0x78)
67#define SDXC_REG_DMAC (0x80)
68#define SDXC_REG_DLBA (0x84)
69#define SDXC_REG_IDST (0x88)
70#define SDXC_REG_IDIE (0x8C)
71#define SDXC_REG_CHDA (0x90)
72#define SDXC_REG_CBDA (0x94)
73
74#define mmc_readl(host, reg) \
75 readl((host)->reg_base + SDXC_##reg)
76#define mmc_writel(host, reg, value) \
77 writel((value), (host)->reg_base + SDXC_##reg)
78
79
80#define SDXC_SOFT_RESET BIT(0)
81#define SDXC_FIFO_RESET BIT(1)
82#define SDXC_DMA_RESET BIT(2)
83#define SDXC_INTERRUPT_ENABLE_BIT BIT(4)
84#define SDXC_DMA_ENABLE_BIT BIT(5)
85#define SDXC_DEBOUNCE_ENABLE_BIT BIT(8)
86#define SDXC_POSEDGE_LATCH_DATA BIT(9)
87#define SDXC_DDR_MODE BIT(10)
88#define SDXC_MEMORY_ACCESS_DONE BIT(29)
89#define SDXC_ACCESS_DONE_DIRECT BIT(30)
90#define SDXC_ACCESS_BY_AHB BIT(31)
91#define SDXC_ACCESS_BY_DMA (0 << 31)
92#define SDXC_HARDWARE_RESET \
93 (SDXC_SOFT_RESET | SDXC_FIFO_RESET | SDXC_DMA_RESET)
94
95
96#define SDXC_CARD_CLOCK_ON BIT(16)
97#define SDXC_LOW_POWER_ON BIT(17)
98
99
100#define SDXC_WIDTH1 0
101#define SDXC_WIDTH4 1
102#define SDXC_WIDTH8 2
103
104
105#define SDXC_RESP_EXPIRE BIT(6)
106#define SDXC_LONG_RESPONSE BIT(7)
107#define SDXC_CHECK_RESPONSE_CRC BIT(8)
108#define SDXC_DATA_EXPIRE BIT(9)
109#define SDXC_WRITE BIT(10)
110#define SDXC_SEQUENCE_MODE BIT(11)
111#define SDXC_SEND_AUTO_STOP BIT(12)
112#define SDXC_WAIT_PRE_OVER BIT(13)
113#define SDXC_STOP_ABORT_CMD BIT(14)
114#define SDXC_SEND_INIT_SEQUENCE BIT(15)
115#define SDXC_UPCLK_ONLY BIT(21)
116#define SDXC_READ_CEATA_DEV BIT(22)
117#define SDXC_CCS_EXPIRE BIT(23)
118#define SDXC_ENABLE_BIT_BOOT BIT(24)
119#define SDXC_ALT_BOOT_OPTIONS BIT(25)
120#define SDXC_BOOT_ACK_EXPIRE BIT(26)
121#define SDXC_BOOT_ABORT BIT(27)
122#define SDXC_VOLTAGE_SWITCH BIT(28)
123#define SDXC_USE_HOLD_REGISTER BIT(29)
124#define SDXC_START BIT(31)
125
126
127#define SDXC_RESP_ERROR BIT(1)
128#define SDXC_COMMAND_DONE BIT(2)
129#define SDXC_DATA_OVER BIT(3)
130#define SDXC_TX_DATA_REQUEST BIT(4)
131#define SDXC_RX_DATA_REQUEST BIT(5)
132#define SDXC_RESP_CRC_ERROR BIT(6)
133#define SDXC_DATA_CRC_ERROR BIT(7)
134#define SDXC_RESP_TIMEOUT BIT(8)
135#define SDXC_DATA_TIMEOUT BIT(9)
136#define SDXC_VOLTAGE_CHANGE_DONE BIT(10)
137#define SDXC_FIFO_RUN_ERROR BIT(11)
138#define SDXC_HARD_WARE_LOCKED BIT(12)
139#define SDXC_START_BIT_ERROR BIT(13)
140#define SDXC_AUTO_COMMAND_DONE BIT(14)
141#define SDXC_END_BIT_ERROR BIT(15)
142#define SDXC_SDIO_INTERRUPT BIT(16)
143#define SDXC_CARD_INSERT BIT(30)
144#define SDXC_CARD_REMOVE BIT(31)
145#define SDXC_INTERRUPT_ERROR_BIT \
146 (SDXC_RESP_ERROR | SDXC_RESP_CRC_ERROR | SDXC_DATA_CRC_ERROR | \
147 SDXC_RESP_TIMEOUT | SDXC_DATA_TIMEOUT | SDXC_FIFO_RUN_ERROR | \
148 SDXC_HARD_WARE_LOCKED | SDXC_START_BIT_ERROR | SDXC_END_BIT_ERROR)
149#define SDXC_INTERRUPT_DONE_BIT \
150 (SDXC_AUTO_COMMAND_DONE | SDXC_DATA_OVER | \
151 SDXC_COMMAND_DONE | SDXC_VOLTAGE_CHANGE_DONE)
152
153
154#define SDXC_RXWL_FLAG BIT(0)
155#define SDXC_TXWL_FLAG BIT(1)
156#define SDXC_FIFO_EMPTY BIT(2)
157#define SDXC_FIFO_FULL BIT(3)
158#define SDXC_CARD_PRESENT BIT(8)
159#define SDXC_CARD_DATA_BUSY BIT(9)
160#define SDXC_DATA_FSM_BUSY BIT(10)
161#define SDXC_DMA_REQUEST BIT(31)
162#define SDXC_FIFO_SIZE 16
163
164
165#define SDXC_CEATA_ON (0xceaa << 16)
166#define SDXC_SEND_IRQ_RESPONSE BIT(0)
167#define SDXC_SDIO_READ_WAIT BIT(1)
168#define SDXC_ABORT_READ_DATA BIT(2)
169#define SDXC_SEND_CCSD BIT(8)
170#define SDXC_SEND_AUTO_STOPCCSD BIT(9)
171#define SDXC_CEATA_DEV_IRQ_ENABLE BIT(10)
172
173
174#define SDXC_IDMAC_SOFT_RESET BIT(0)
175#define SDXC_IDMAC_FIX_BURST BIT(1)
176#define SDXC_IDMAC_IDMA_ON BIT(7)
177#define SDXC_IDMAC_REFETCH_DES BIT(31)
178
179
180#define SDXC_IDMAC_TRANSMIT_INTERRUPT BIT(0)
181#define SDXC_IDMAC_RECEIVE_INTERRUPT BIT(1)
182#define SDXC_IDMAC_FATAL_BUS_ERROR BIT(2)
183#define SDXC_IDMAC_DESTINATION_INVALID BIT(4)
184#define SDXC_IDMAC_CARD_ERROR_SUM BIT(5)
185#define SDXC_IDMAC_NORMAL_INTERRUPT_SUM BIT(8)
186#define SDXC_IDMAC_ABNORMAL_INTERRUPT_SUM BIT(9)
187#define SDXC_IDMAC_HOST_ABORT_INTERRUPT BIT(10)
188#define SDXC_IDMAC_IDLE (0 << 13)
189#define SDXC_IDMAC_SUSPEND (1 << 13)
190#define SDXC_IDMAC_DESC_READ (2 << 13)
191#define SDXC_IDMAC_DESC_CHECK (3 << 13)
192#define SDXC_IDMAC_READ_REQUEST_WAIT (4 << 13)
193#define SDXC_IDMAC_WRITE_REQUEST_WAIT (5 << 13)
194#define SDXC_IDMAC_READ (6 << 13)
195#define SDXC_IDMAC_WRITE (7 << 13)
196#define SDXC_IDMAC_DESC_CLOSE (8 << 13)
197
198
199
200
201
202
203
204
205#define SDXC_IDMAC_DES0_DIC BIT(1)
206#define SDXC_IDMAC_DES0_LD BIT(2)
207#define SDXC_IDMAC_DES0_FD BIT(3)
208#define SDXC_IDMAC_DES0_CH BIT(4)
209#define SDXC_IDMAC_DES0_ER BIT(5)
210#define SDXC_IDMAC_DES0_CES BIT(30)
211#define SDXC_IDMAC_DES0_OWN BIT(31)
212
213#define SDXC_CLK_400K 0
214#define SDXC_CLK_25M 1
215#define SDXC_CLK_50M 2
216#define SDXC_CLK_50M_DDR 3
217
218struct sunxi_mmc_clk_delay {
219 u32 output;
220 u32 sample;
221};
222
223struct sunxi_idma_des {
224 u32 config;
225 u32 buf_size;
226 u32 buf_addr_ptr1;
227 u32 buf_addr_ptr2;
228};
229
230struct sunxi_mmc_host {
231 struct mmc_host *mmc;
232 struct reset_control *reset;
233
234
235 void __iomem *reg_base;
236
237
238 struct clk *clk_ahb;
239 struct clk *clk_mmc;
240 struct clk *clk_sample;
241 struct clk *clk_output;
242 const struct sunxi_mmc_clk_delay *clk_delays;
243
244
245 spinlock_t lock;
246 int irq;
247 u32 int_sum;
248 u32 sdio_imask;
249
250
251 u32 idma_des_size_bits;
252 dma_addr_t sg_dma;
253 void *sg_cpu;
254 bool wait_dma;
255
256 struct mmc_request *mrq;
257 struct mmc_request *manual_stop_mrq;
258 int ferror;
259};
260
261static int sunxi_mmc_reset_host(struct sunxi_mmc_host *host)
262{
263 unsigned long expire = jiffies + msecs_to_jiffies(250);
264 u32 rval;
265
266 mmc_writel(host, REG_GCTRL, SDXC_HARDWARE_RESET);
267 do {
268 rval = mmc_readl(host, REG_GCTRL);
269 } while (time_before(jiffies, expire) && (rval & SDXC_HARDWARE_RESET));
270
271 if (rval & SDXC_HARDWARE_RESET) {
272 dev_err(mmc_dev(host->mmc), "fatal err reset timeout\n");
273 return -EIO;
274 }
275
276 return 0;
277}
278
279static int sunxi_mmc_init_host(struct mmc_host *mmc)
280{
281 u32 rval;
282 struct sunxi_mmc_host *host = mmc_priv(mmc);
283
284 if (sunxi_mmc_reset_host(host))
285 return -EIO;
286
287 mmc_writel(host, REG_FTRGL, 0x20070008);
288 mmc_writel(host, REG_TMOUT, 0xffffffff);
289 mmc_writel(host, REG_IMASK, host->sdio_imask);
290 mmc_writel(host, REG_RINTR, 0xffffffff);
291 mmc_writel(host, REG_DBGC, 0xdeb);
292 mmc_writel(host, REG_FUNS, SDXC_CEATA_ON);
293 mmc_writel(host, REG_DLBA, host->sg_dma);
294
295 rval = mmc_readl(host, REG_GCTRL);
296 rval |= SDXC_INTERRUPT_ENABLE_BIT;
297 rval &= ~SDXC_ACCESS_DONE_DIRECT;
298 mmc_writel(host, REG_GCTRL, rval);
299
300 return 0;
301}
302
303static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host,
304 struct mmc_data *data)
305{
306 struct sunxi_idma_des *pdes = (struct sunxi_idma_des *)host->sg_cpu;
307 dma_addr_t next_desc = host->sg_dma;
308 int i, max_len = (1 << host->idma_des_size_bits);
309
310 for (i = 0; i < data->sg_len; i++) {
311 pdes[i].config = SDXC_IDMAC_DES0_CH | SDXC_IDMAC_DES0_OWN |
312 SDXC_IDMAC_DES0_DIC;
313
314 if (data->sg[i].length == max_len)
315 pdes[i].buf_size = 0;
316 else
317 pdes[i].buf_size = data->sg[i].length;
318
319 next_desc += sizeof(struct sunxi_idma_des);
320 pdes[i].buf_addr_ptr1 = sg_dma_address(&data->sg[i]);
321 pdes[i].buf_addr_ptr2 = (u32)next_desc;
322 }
323
324 pdes[0].config |= SDXC_IDMAC_DES0_FD;
325 pdes[i - 1].config |= SDXC_IDMAC_DES0_LD | SDXC_IDMAC_DES0_ER;
326 pdes[i - 1].config &= ~SDXC_IDMAC_DES0_DIC;
327 pdes[i - 1].buf_addr_ptr2 = 0;
328
329
330
331
332
333 wmb();
334}
335
336static enum dma_data_direction sunxi_mmc_get_dma_dir(struct mmc_data *data)
337{
338 if (data->flags & MMC_DATA_WRITE)
339 return DMA_TO_DEVICE;
340 else
341 return DMA_FROM_DEVICE;
342}
343
344static int sunxi_mmc_map_dma(struct sunxi_mmc_host *host,
345 struct mmc_data *data)
346{
347 u32 i, dma_len;
348 struct scatterlist *sg;
349
350 dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
351 sunxi_mmc_get_dma_dir(data));
352 if (dma_len == 0) {
353 dev_err(mmc_dev(host->mmc), "dma_map_sg failed\n");
354 return -ENOMEM;
355 }
356
357 for_each_sg(data->sg, sg, data->sg_len, i) {
358 if (sg->offset & 3 || sg->length & 3) {
359 dev_err(mmc_dev(host->mmc),
360 "unaligned scatterlist: os %x length %d\n",
361 sg->offset, sg->length);
362 return -EINVAL;
363 }
364 }
365
366 return 0;
367}
368
369static void sunxi_mmc_start_dma(struct sunxi_mmc_host *host,
370 struct mmc_data *data)
371{
372 u32 rval;
373
374 sunxi_mmc_init_idma_des(host, data);
375
376 rval = mmc_readl(host, REG_GCTRL);
377 rval |= SDXC_DMA_ENABLE_BIT;
378 mmc_writel(host, REG_GCTRL, rval);
379 rval |= SDXC_DMA_RESET;
380 mmc_writel(host, REG_GCTRL, rval);
381
382 mmc_writel(host, REG_DMAC, SDXC_IDMAC_SOFT_RESET);
383
384 if (!(data->flags & MMC_DATA_WRITE))
385 mmc_writel(host, REG_IDIE, SDXC_IDMAC_RECEIVE_INTERRUPT);
386
387 mmc_writel(host, REG_DMAC,
388 SDXC_IDMAC_FIX_BURST | SDXC_IDMAC_IDMA_ON);
389}
390
391static void sunxi_mmc_send_manual_stop(struct sunxi_mmc_host *host,
392 struct mmc_request *req)
393{
394 u32 arg, cmd_val, ri;
395 unsigned long expire = jiffies + msecs_to_jiffies(1000);
396
397 cmd_val = SDXC_START | SDXC_RESP_EXPIRE |
398 SDXC_STOP_ABORT_CMD | SDXC_CHECK_RESPONSE_CRC;
399
400 if (req->cmd->opcode == SD_IO_RW_EXTENDED) {
401 cmd_val |= SD_IO_RW_DIRECT;
402 arg = (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) |
403 ((req->cmd->arg >> 28) & 0x7);
404 } else {
405 cmd_val |= MMC_STOP_TRANSMISSION;
406 arg = 0;
407 }
408
409 mmc_writel(host, REG_CARG, arg);
410 mmc_writel(host, REG_CMDR, cmd_val);
411
412 do {
413 ri = mmc_readl(host, REG_RINTR);
414 } while (!(ri & (SDXC_COMMAND_DONE | SDXC_INTERRUPT_ERROR_BIT)) &&
415 time_before(jiffies, expire));
416
417 if (!(ri & SDXC_COMMAND_DONE) || (ri & SDXC_INTERRUPT_ERROR_BIT)) {
418 dev_err(mmc_dev(host->mmc), "send stop command failed\n");
419 if (req->stop)
420 req->stop->resp[0] = -ETIMEDOUT;
421 } else {
422 if (req->stop)
423 req->stop->resp[0] = mmc_readl(host, REG_RESP0);
424 }
425
426 mmc_writel(host, REG_RINTR, 0xffff);
427}
428
429static void sunxi_mmc_dump_errinfo(struct sunxi_mmc_host *host)
430{
431 struct mmc_command *cmd = host->mrq->cmd;
432 struct mmc_data *data = host->mrq->data;
433
434
435 if ((host->int_sum & SDXC_INTERRUPT_ERROR_BIT) ==
436 SDXC_RESP_TIMEOUT && (cmd->opcode == SD_IO_SEND_OP_COND ||
437 cmd->opcode == SD_IO_RW_DIRECT))
438 return;
439
440 dev_err(mmc_dev(host->mmc),
441 "smc %d err, cmd %d,%s%s%s%s%s%s%s%s%s%s !!\n",
442 host->mmc->index, cmd->opcode,
443 data ? (data->flags & MMC_DATA_WRITE ? " WR" : " RD") : "",
444 host->int_sum & SDXC_RESP_ERROR ? " RE" : "",
445 host->int_sum & SDXC_RESP_CRC_ERROR ? " RCE" : "",
446 host->int_sum & SDXC_DATA_CRC_ERROR ? " DCE" : "",
447 host->int_sum & SDXC_RESP_TIMEOUT ? " RTO" : "",
448 host->int_sum & SDXC_DATA_TIMEOUT ? " DTO" : "",
449 host->int_sum & SDXC_FIFO_RUN_ERROR ? " FE" : "",
450 host->int_sum & SDXC_HARD_WARE_LOCKED ? " HL" : "",
451 host->int_sum & SDXC_START_BIT_ERROR ? " SBE" : "",
452 host->int_sum & SDXC_END_BIT_ERROR ? " EBE" : ""
453 );
454}
455
456
457static irqreturn_t sunxi_mmc_finalize_request(struct sunxi_mmc_host *host)
458{
459 struct mmc_request *mrq = host->mrq;
460 struct mmc_data *data = mrq->data;
461 u32 rval;
462
463 mmc_writel(host, REG_IMASK, host->sdio_imask);
464 mmc_writel(host, REG_IDIE, 0);
465
466 if (host->int_sum & SDXC_INTERRUPT_ERROR_BIT) {
467 sunxi_mmc_dump_errinfo(host);
468 mrq->cmd->error = -ETIMEDOUT;
469
470 if (data) {
471 data->error = -ETIMEDOUT;
472 host->manual_stop_mrq = mrq;
473 }
474
475 if (mrq->stop)
476 mrq->stop->error = -ETIMEDOUT;
477 } else {
478 if (mrq->cmd->flags & MMC_RSP_136) {
479 mrq->cmd->resp[0] = mmc_readl(host, REG_RESP3);
480 mrq->cmd->resp[1] = mmc_readl(host, REG_RESP2);
481 mrq->cmd->resp[2] = mmc_readl(host, REG_RESP1);
482 mrq->cmd->resp[3] = mmc_readl(host, REG_RESP0);
483 } else {
484 mrq->cmd->resp[0] = mmc_readl(host, REG_RESP0);
485 }
486
487 if (data)
488 data->bytes_xfered = data->blocks * data->blksz;
489 }
490
491 if (data) {
492 mmc_writel(host, REG_IDST, 0x337);
493 mmc_writel(host, REG_DMAC, 0);
494 rval = mmc_readl(host, REG_GCTRL);
495 rval |= SDXC_DMA_RESET;
496 mmc_writel(host, REG_GCTRL, rval);
497 rval &= ~SDXC_DMA_ENABLE_BIT;
498 mmc_writel(host, REG_GCTRL, rval);
499 rval |= SDXC_FIFO_RESET;
500 mmc_writel(host, REG_GCTRL, rval);
501 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
502 sunxi_mmc_get_dma_dir(data));
503 }
504
505 mmc_writel(host, REG_RINTR, 0xffff);
506
507 host->mrq = NULL;
508 host->int_sum = 0;
509 host->wait_dma = false;
510
511 return host->manual_stop_mrq ? IRQ_WAKE_THREAD : IRQ_HANDLED;
512}
513
514static irqreturn_t sunxi_mmc_irq(int irq, void *dev_id)
515{
516 struct sunxi_mmc_host *host = dev_id;
517 struct mmc_request *mrq;
518 u32 msk_int, idma_int;
519 bool finalize = false;
520 bool sdio_int = false;
521 irqreturn_t ret = IRQ_HANDLED;
522
523 spin_lock(&host->lock);
524
525 idma_int = mmc_readl(host, REG_IDST);
526 msk_int = mmc_readl(host, REG_MISTA);
527
528 dev_dbg(mmc_dev(host->mmc), "irq: rq %p mi %08x idi %08x\n",
529 host->mrq, msk_int, idma_int);
530
531 mrq = host->mrq;
532 if (mrq) {
533 if (idma_int & SDXC_IDMAC_RECEIVE_INTERRUPT)
534 host->wait_dma = false;
535
536 host->int_sum |= msk_int;
537
538
539 if ((host->int_sum & SDXC_RESP_TIMEOUT) &&
540 !(host->int_sum & SDXC_COMMAND_DONE))
541 mmc_writel(host, REG_IMASK,
542 host->sdio_imask | SDXC_COMMAND_DONE);
543
544 else if (host->int_sum & SDXC_INTERRUPT_ERROR_BIT)
545 finalize = true;
546 else if ((host->int_sum & SDXC_INTERRUPT_DONE_BIT) &&
547 !host->wait_dma)
548 finalize = true;
549 }
550
551 if (msk_int & SDXC_SDIO_INTERRUPT)
552 sdio_int = true;
553
554 mmc_writel(host, REG_RINTR, msk_int);
555 mmc_writel(host, REG_IDST, idma_int);
556
557 if (finalize)
558 ret = sunxi_mmc_finalize_request(host);
559
560 spin_unlock(&host->lock);
561
562 if (finalize && ret == IRQ_HANDLED)
563 mmc_request_done(host->mmc, mrq);
564
565 if (sdio_int)
566 mmc_signal_sdio_irq(host->mmc);
567
568 return ret;
569}
570
571static irqreturn_t sunxi_mmc_handle_manual_stop(int irq, void *dev_id)
572{
573 struct sunxi_mmc_host *host = dev_id;
574 struct mmc_request *mrq;
575 unsigned long iflags;
576
577 spin_lock_irqsave(&host->lock, iflags);
578 mrq = host->manual_stop_mrq;
579 spin_unlock_irqrestore(&host->lock, iflags);
580
581 if (!mrq) {
582 dev_err(mmc_dev(host->mmc), "no request for manual stop\n");
583 return IRQ_HANDLED;
584 }
585
586 dev_err(mmc_dev(host->mmc), "data error, sending stop command\n");
587
588
589
590
591
592
593
594
595
596 sunxi_mmc_send_manual_stop(host, mrq);
597
598 spin_lock_irqsave(&host->lock, iflags);
599 host->manual_stop_mrq = NULL;
600 spin_unlock_irqrestore(&host->lock, iflags);
601
602 mmc_request_done(host->mmc, mrq);
603
604 return IRQ_HANDLED;
605}
606
607static int sunxi_mmc_oclk_onoff(struct sunxi_mmc_host *host, u32 oclk_en)
608{
609 unsigned long expire = jiffies + msecs_to_jiffies(750);
610 u32 rval;
611
612 rval = mmc_readl(host, REG_CLKCR);
613 rval &= ~(SDXC_CARD_CLOCK_ON | SDXC_LOW_POWER_ON);
614
615 if (oclk_en)
616 rval |= SDXC_CARD_CLOCK_ON;
617
618 mmc_writel(host, REG_CLKCR, rval);
619
620 rval = SDXC_START | SDXC_UPCLK_ONLY | SDXC_WAIT_PRE_OVER;
621 mmc_writel(host, REG_CMDR, rval);
622
623 do {
624 rval = mmc_readl(host, REG_CMDR);
625 } while (time_before(jiffies, expire) && (rval & SDXC_START));
626
627
628 mmc_writel(host, REG_RINTR,
629 mmc_readl(host, REG_RINTR) & ~SDXC_SDIO_INTERRUPT);
630
631 if (rval & SDXC_START) {
632 dev_err(mmc_dev(host->mmc), "fatal err update clk timeout\n");
633 return -EIO;
634 }
635
636 return 0;
637}
638
639static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
640 struct mmc_ios *ios)
641{
642 u32 rate, oclk_dly, rval, sclk_dly;
643 int ret;
644
645 rate = clk_round_rate(host->clk_mmc, ios->clock);
646 dev_dbg(mmc_dev(host->mmc), "setting clk to %d, rounded %d\n",
647 ios->clock, rate);
648
649
650 ret = clk_set_rate(host->clk_mmc, rate);
651 if (ret) {
652 dev_err(mmc_dev(host->mmc), "error setting clk to %d: %d\n",
653 rate, ret);
654 return ret;
655 }
656
657 ret = sunxi_mmc_oclk_onoff(host, 0);
658 if (ret)
659 return ret;
660
661
662 rval = mmc_readl(host, REG_CLKCR);
663 rval &= ~0xff;
664 mmc_writel(host, REG_CLKCR, rval);
665
666
667 if (rate <= 400000) {
668 oclk_dly = host->clk_delays[SDXC_CLK_400K].output;
669 sclk_dly = host->clk_delays[SDXC_CLK_400K].sample;
670 } else if (rate <= 25000000) {
671 oclk_dly = host->clk_delays[SDXC_CLK_25M].output;
672 sclk_dly = host->clk_delays[SDXC_CLK_25M].sample;
673 } else if (rate <= 50000000) {
674 if (ios->timing == MMC_TIMING_UHS_DDR50) {
675 oclk_dly = host->clk_delays[SDXC_CLK_50M_DDR].output;
676 sclk_dly = host->clk_delays[SDXC_CLK_50M_DDR].sample;
677 } else {
678 oclk_dly = host->clk_delays[SDXC_CLK_50M].output;
679 sclk_dly = host->clk_delays[SDXC_CLK_50M].sample;
680 }
681 } else {
682 return -EINVAL;
683 }
684
685 clk_set_phase(host->clk_sample, sclk_dly);
686 clk_set_phase(host->clk_output, oclk_dly);
687
688 return sunxi_mmc_oclk_onoff(host, 1);
689}
690
691static void sunxi_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
692{
693 struct sunxi_mmc_host *host = mmc_priv(mmc);
694 u32 rval;
695
696
697 switch (ios->power_mode) {
698 case MMC_POWER_ON:
699 break;
700
701 case MMC_POWER_UP:
702 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
703
704 host->ferror = sunxi_mmc_init_host(mmc);
705 if (host->ferror)
706 return;
707
708 dev_dbg(mmc_dev(mmc), "power on!\n");
709 break;
710
711 case MMC_POWER_OFF:
712 dev_dbg(mmc_dev(mmc), "power off!\n");
713 sunxi_mmc_reset_host(host);
714 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
715 break;
716 }
717
718
719 switch (ios->bus_width) {
720 case MMC_BUS_WIDTH_1:
721 mmc_writel(host, REG_WIDTH, SDXC_WIDTH1);
722 break;
723 case MMC_BUS_WIDTH_4:
724 mmc_writel(host, REG_WIDTH, SDXC_WIDTH4);
725 break;
726 case MMC_BUS_WIDTH_8:
727 mmc_writel(host, REG_WIDTH, SDXC_WIDTH8);
728 break;
729 }
730
731
732 rval = mmc_readl(host, REG_GCTRL);
733 if (ios->timing == MMC_TIMING_UHS_DDR50)
734 rval |= SDXC_DDR_MODE;
735 else
736 rval &= ~SDXC_DDR_MODE;
737 mmc_writel(host, REG_GCTRL, rval);
738
739
740 if (ios->clock && ios->power_mode) {
741 host->ferror = sunxi_mmc_clk_set_rate(host, ios);
742
743 }
744}
745
746static void sunxi_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
747{
748 struct sunxi_mmc_host *host = mmc_priv(mmc);
749 unsigned long flags;
750 u32 imask;
751
752 spin_lock_irqsave(&host->lock, flags);
753
754 imask = mmc_readl(host, REG_IMASK);
755 if (enable) {
756 host->sdio_imask = SDXC_SDIO_INTERRUPT;
757 imask |= SDXC_SDIO_INTERRUPT;
758 } else {
759 host->sdio_imask = 0;
760 imask &= ~SDXC_SDIO_INTERRUPT;
761 }
762 mmc_writel(host, REG_IMASK, imask);
763 spin_unlock_irqrestore(&host->lock, flags);
764}
765
766static void sunxi_mmc_hw_reset(struct mmc_host *mmc)
767{
768 struct sunxi_mmc_host *host = mmc_priv(mmc);
769 mmc_writel(host, REG_HWRST, 0);
770 udelay(10);
771 mmc_writel(host, REG_HWRST, 1);
772 udelay(300);
773}
774
775static void sunxi_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
776{
777 struct sunxi_mmc_host *host = mmc_priv(mmc);
778 struct mmc_command *cmd = mrq->cmd;
779 struct mmc_data *data = mrq->data;
780 unsigned long iflags;
781 u32 imask = SDXC_INTERRUPT_ERROR_BIT;
782 u32 cmd_val = SDXC_START | (cmd->opcode & 0x3f);
783 bool wait_dma = host->wait_dma;
784 int ret;
785
786
787 if (host->ferror) {
788 mrq->cmd->error = host->ferror;
789 mmc_request_done(mmc, mrq);
790 return;
791 }
792
793 if (data) {
794 ret = sunxi_mmc_map_dma(host, data);
795 if (ret < 0) {
796 dev_err(mmc_dev(mmc), "map DMA failed\n");
797 cmd->error = ret;
798 data->error = ret;
799 mmc_request_done(mmc, mrq);
800 return;
801 }
802 }
803
804 if (cmd->opcode == MMC_GO_IDLE_STATE) {
805 cmd_val |= SDXC_SEND_INIT_SEQUENCE;
806 imask |= SDXC_COMMAND_DONE;
807 }
808
809 if (cmd->flags & MMC_RSP_PRESENT) {
810 cmd_val |= SDXC_RESP_EXPIRE;
811 if (cmd->flags & MMC_RSP_136)
812 cmd_val |= SDXC_LONG_RESPONSE;
813 if (cmd->flags & MMC_RSP_CRC)
814 cmd_val |= SDXC_CHECK_RESPONSE_CRC;
815
816 if ((cmd->flags & MMC_CMD_MASK) == MMC_CMD_ADTC) {
817 cmd_val |= SDXC_DATA_EXPIRE | SDXC_WAIT_PRE_OVER;
818 if (cmd->data->flags & MMC_DATA_STREAM) {
819 imask |= SDXC_AUTO_COMMAND_DONE;
820 cmd_val |= SDXC_SEQUENCE_MODE |
821 SDXC_SEND_AUTO_STOP;
822 }
823
824 if (cmd->data->stop) {
825 imask |= SDXC_AUTO_COMMAND_DONE;
826 cmd_val |= SDXC_SEND_AUTO_STOP;
827 } else {
828 imask |= SDXC_DATA_OVER;
829 }
830
831 if (cmd->data->flags & MMC_DATA_WRITE)
832 cmd_val |= SDXC_WRITE;
833 else
834 wait_dma = true;
835 } else {
836 imask |= SDXC_COMMAND_DONE;
837 }
838 } else {
839 imask |= SDXC_COMMAND_DONE;
840 }
841
842 dev_dbg(mmc_dev(mmc), "cmd %d(%08x) arg %x ie 0x%08x len %d\n",
843 cmd_val & 0x3f, cmd_val, cmd->arg, imask,
844 mrq->data ? mrq->data->blksz * mrq->data->blocks : 0);
845
846 spin_lock_irqsave(&host->lock, iflags);
847
848 if (host->mrq || host->manual_stop_mrq) {
849 spin_unlock_irqrestore(&host->lock, iflags);
850
851 if (data)
852 dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len,
853 sunxi_mmc_get_dma_dir(data));
854
855 dev_err(mmc_dev(mmc), "request already pending\n");
856 mrq->cmd->error = -EBUSY;
857 mmc_request_done(mmc, mrq);
858 return;
859 }
860
861 if (data) {
862 mmc_writel(host, REG_BLKSZ, data->blksz);
863 mmc_writel(host, REG_BCNTR, data->blksz * data->blocks);
864 sunxi_mmc_start_dma(host, data);
865 }
866
867 host->mrq = mrq;
868 host->wait_dma = wait_dma;
869 mmc_writel(host, REG_IMASK, host->sdio_imask | imask);
870 mmc_writel(host, REG_CARG, cmd->arg);
871 mmc_writel(host, REG_CMDR, cmd_val);
872
873 spin_unlock_irqrestore(&host->lock, iflags);
874}
875
876static const struct of_device_id sunxi_mmc_of_match[] = {
877 { .compatible = "allwinner,sun4i-a10-mmc", },
878 { .compatible = "allwinner,sun5i-a13-mmc", },
879 { .compatible = "allwinner,sun9i-a80-mmc", },
880 { }
881};
882MODULE_DEVICE_TABLE(of, sunxi_mmc_of_match);
883
884static struct mmc_host_ops sunxi_mmc_ops = {
885 .request = sunxi_mmc_request,
886 .set_ios = sunxi_mmc_set_ios,
887 .get_ro = mmc_gpio_get_ro,
888 .get_cd = mmc_gpio_get_cd,
889 .enable_sdio_irq = sunxi_mmc_enable_sdio_irq,
890 .hw_reset = sunxi_mmc_hw_reset,
891};
892
893static const struct sunxi_mmc_clk_delay sunxi_mmc_clk_delays[] = {
894 [SDXC_CLK_400K] = { .output = 180, .sample = 180 },
895 [SDXC_CLK_25M] = { .output = 180, .sample = 75 },
896 [SDXC_CLK_50M] = { .output = 90, .sample = 120 },
897 [SDXC_CLK_50M_DDR] = { .output = 60, .sample = 120 },
898};
899
900static const struct sunxi_mmc_clk_delay sun9i_mmc_clk_delays[] = {
901 [SDXC_CLK_400K] = { .output = 180, .sample = 180 },
902 [SDXC_CLK_25M] = { .output = 180, .sample = 75 },
903 [SDXC_CLK_50M] = { .output = 150, .sample = 120 },
904 [SDXC_CLK_50M_DDR] = { .output = 90, .sample = 120 },
905};
906
907static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host,
908 struct platform_device *pdev)
909{
910 struct device_node *np = pdev->dev.of_node;
911 int ret;
912
913 if (of_device_is_compatible(np, "allwinner,sun4i-a10-mmc"))
914 host->idma_des_size_bits = 13;
915 else
916 host->idma_des_size_bits = 16;
917
918 if (of_device_is_compatible(np, "allwinner,sun9i-a80-mmc"))
919 host->clk_delays = sun9i_mmc_clk_delays;
920 else
921 host->clk_delays = sunxi_mmc_clk_delays;
922
923 ret = mmc_regulator_get_supply(host->mmc);
924 if (ret) {
925 if (ret != -EPROBE_DEFER)
926 dev_err(&pdev->dev, "Could not get vmmc supply\n");
927 return ret;
928 }
929
930 host->reg_base = devm_ioremap_resource(&pdev->dev,
931 platform_get_resource(pdev, IORESOURCE_MEM, 0));
932 if (IS_ERR(host->reg_base))
933 return PTR_ERR(host->reg_base);
934
935 host->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
936 if (IS_ERR(host->clk_ahb)) {
937 dev_err(&pdev->dev, "Could not get ahb clock\n");
938 return PTR_ERR(host->clk_ahb);
939 }
940
941 host->clk_mmc = devm_clk_get(&pdev->dev, "mmc");
942 if (IS_ERR(host->clk_mmc)) {
943 dev_err(&pdev->dev, "Could not get mmc clock\n");
944 return PTR_ERR(host->clk_mmc);
945 }
946
947 host->clk_output = devm_clk_get(&pdev->dev, "output");
948 if (IS_ERR(host->clk_output)) {
949 dev_err(&pdev->dev, "Could not get output clock\n");
950 return PTR_ERR(host->clk_output);
951 }
952
953 host->clk_sample = devm_clk_get(&pdev->dev, "sample");
954 if (IS_ERR(host->clk_sample)) {
955 dev_err(&pdev->dev, "Could not get sample clock\n");
956 return PTR_ERR(host->clk_sample);
957 }
958
959 host->reset = devm_reset_control_get_optional(&pdev->dev, "ahb");
960 if (PTR_ERR(host->reset) == -EPROBE_DEFER)
961 return PTR_ERR(host->reset);
962
963 ret = clk_prepare_enable(host->clk_ahb);
964 if (ret) {
965 dev_err(&pdev->dev, "Enable ahb clk err %d\n", ret);
966 return ret;
967 }
968
969 ret = clk_prepare_enable(host->clk_mmc);
970 if (ret) {
971 dev_err(&pdev->dev, "Enable mmc clk err %d\n", ret);
972 goto error_disable_clk_ahb;
973 }
974
975 ret = clk_prepare_enable(host->clk_output);
976 if (ret) {
977 dev_err(&pdev->dev, "Enable output clk err %d\n", ret);
978 goto error_disable_clk_mmc;
979 }
980
981 ret = clk_prepare_enable(host->clk_sample);
982 if (ret) {
983 dev_err(&pdev->dev, "Enable sample clk err %d\n", ret);
984 goto error_disable_clk_output;
985 }
986
987 if (!IS_ERR(host->reset)) {
988 ret = reset_control_deassert(host->reset);
989 if (ret) {
990 dev_err(&pdev->dev, "reset err %d\n", ret);
991 goto error_disable_clk_sample;
992 }
993 }
994
995
996
997
998
999 ret = sunxi_mmc_reset_host(host);
1000 if (ret)
1001 goto error_assert_reset;
1002
1003 host->irq = platform_get_irq(pdev, 0);
1004 return devm_request_threaded_irq(&pdev->dev, host->irq, sunxi_mmc_irq,
1005 sunxi_mmc_handle_manual_stop, 0, "sunxi-mmc", host);
1006
1007error_assert_reset:
1008 if (!IS_ERR(host->reset))
1009 reset_control_assert(host->reset);
1010error_disable_clk_sample:
1011 clk_disable_unprepare(host->clk_sample);
1012error_disable_clk_output:
1013 clk_disable_unprepare(host->clk_output);
1014error_disable_clk_mmc:
1015 clk_disable_unprepare(host->clk_mmc);
1016error_disable_clk_ahb:
1017 clk_disable_unprepare(host->clk_ahb);
1018 return ret;
1019}
1020
1021static int sunxi_mmc_probe(struct platform_device *pdev)
1022{
1023 struct sunxi_mmc_host *host;
1024 struct mmc_host *mmc;
1025 int ret;
1026
1027 mmc = mmc_alloc_host(sizeof(struct sunxi_mmc_host), &pdev->dev);
1028 if (!mmc) {
1029 dev_err(&pdev->dev, "mmc alloc host failed\n");
1030 return -ENOMEM;
1031 }
1032
1033 host = mmc_priv(mmc);
1034 host->mmc = mmc;
1035 spin_lock_init(&host->lock);
1036
1037 ret = sunxi_mmc_resource_request(host, pdev);
1038 if (ret)
1039 goto error_free_host;
1040
1041 host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
1042 &host->sg_dma, GFP_KERNEL);
1043 if (!host->sg_cpu) {
1044 dev_err(&pdev->dev, "Failed to allocate DMA descriptor mem\n");
1045 ret = -ENOMEM;
1046 goto error_free_host;
1047 }
1048
1049 mmc->ops = &sunxi_mmc_ops;
1050 mmc->max_blk_count = 8192;
1051 mmc->max_blk_size = 4096;
1052 mmc->max_segs = PAGE_SIZE / sizeof(struct sunxi_idma_des);
1053 mmc->max_seg_size = (1 << host->idma_des_size_bits);
1054 mmc->max_req_size = mmc->max_seg_size * mmc->max_segs;
1055
1056 mmc->f_min = 400000;
1057 mmc->f_max = 50000000;
1058 mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
1059 MMC_CAP_ERASE | MMC_CAP_SDIO_IRQ;
1060
1061 ret = mmc_of_parse(mmc);
1062 if (ret)
1063 goto error_free_dma;
1064
1065 ret = mmc_add_host(mmc);
1066 if (ret)
1067 goto error_free_dma;
1068
1069 dev_info(&pdev->dev, "base:0x%p irq:%u\n", host->reg_base, host->irq);
1070 platform_set_drvdata(pdev, mmc);
1071 return 0;
1072
1073error_free_dma:
1074 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
1075error_free_host:
1076 mmc_free_host(mmc);
1077 return ret;
1078}
1079
1080static int sunxi_mmc_remove(struct platform_device *pdev)
1081{
1082 struct mmc_host *mmc = platform_get_drvdata(pdev);
1083 struct sunxi_mmc_host *host = mmc_priv(mmc);
1084
1085 mmc_remove_host(mmc);
1086 disable_irq(host->irq);
1087 sunxi_mmc_reset_host(host);
1088
1089 if (!IS_ERR(host->reset))
1090 reset_control_assert(host->reset);
1091
1092 clk_disable_unprepare(host->clk_mmc);
1093 clk_disable_unprepare(host->clk_ahb);
1094
1095 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
1096 mmc_free_host(mmc);
1097
1098 return 0;
1099}
1100
1101static struct platform_driver sunxi_mmc_driver = {
1102 .driver = {
1103 .name = "sunxi-mmc",
1104 .of_match_table = of_match_ptr(sunxi_mmc_of_match),
1105 },
1106 .probe = sunxi_mmc_probe,
1107 .remove = sunxi_mmc_remove,
1108};
1109module_platform_driver(sunxi_mmc_driver);
1110
1111MODULE_DESCRIPTION("Allwinner's SD/MMC Card Controller Driver");
1112MODULE_LICENSE("GPL v2");
1113MODULE_AUTHOR("David Lanzend�rfer <david.lanzendoerfer@o2s.ch>");
1114MODULE_ALIAS("platform:sunxi-mmc");
1115
