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3a96dff0 TP |
1 | /* |
2 | * WM8505/WM8650 SD/MMC Host Controller | |
3 | * | |
4 | * Copyright (C) 2010 Tony Prisk | |
5 | * Copyright (C) 2008 WonderMedia Technologies, Inc. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation | |
10 | */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/ioport.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/io.h> | |
20 | #include <linux/irq.h> | |
21 | #include <linux/clk.h> | |
22 | #include <linux/gpio.h> | |
b8789ec4 | 23 | #include <linux/interrupt.h> |
3a96dff0 TP |
24 | |
25 | #include <linux/of.h> | |
26 | #include <linux/of_address.h> | |
27 | #include <linux/of_irq.h> | |
28 | #include <linux/of_device.h> | |
29 | ||
30 | #include <linux/mmc/host.h> | |
31 | #include <linux/mmc/mmc.h> | |
32 | #include <linux/mmc/sd.h> | |
33 | ||
34 | #include <asm/byteorder.h> | |
35 | ||
36 | ||
37 | #define DRIVER_NAME "wmt-sdhc" | |
38 | ||
39 | ||
40 | /* MMC/SD controller registers */ | |
41 | #define SDMMC_CTLR 0x00 | |
42 | #define SDMMC_CMD 0x01 | |
43 | #define SDMMC_RSPTYPE 0x02 | |
44 | #define SDMMC_ARG 0x04 | |
45 | #define SDMMC_BUSMODE 0x08 | |
46 | #define SDMMC_BLKLEN 0x0C | |
47 | #define SDMMC_BLKCNT 0x0E | |
48 | #define SDMMC_RSP 0x10 | |
49 | #define SDMMC_CBCR 0x20 | |
50 | #define SDMMC_INTMASK0 0x24 | |
51 | #define SDMMC_INTMASK1 0x25 | |
52 | #define SDMMC_STS0 0x28 | |
53 | #define SDMMC_STS1 0x29 | |
54 | #define SDMMC_STS2 0x2A | |
55 | #define SDMMC_STS3 0x2B | |
56 | #define SDMMC_RSPTIMEOUT 0x2C | |
57 | #define SDMMC_CLK 0x30 /* VT8500 only */ | |
58 | #define SDMMC_EXTCTRL 0x34 | |
59 | #define SDMMC_SBLKLEN 0x38 | |
60 | #define SDMMC_DMATIMEOUT 0x3C | |
61 | ||
62 | ||
63 | /* SDMMC_CTLR bit fields */ | |
64 | #define CTLR_CMD_START 0x01 | |
65 | #define CTLR_CMD_WRITE 0x04 | |
66 | #define CTLR_FIFO_RESET 0x08 | |
67 | ||
68 | /* SDMMC_BUSMODE bit fields */ | |
69 | #define BM_SPI_MODE 0x01 | |
70 | #define BM_FOURBIT_MODE 0x02 | |
71 | #define BM_EIGHTBIT_MODE 0x04 | |
72 | #define BM_SD_OFF 0x10 | |
73 | #define BM_SPI_CS 0x20 | |
74 | #define BM_SD_POWER 0x40 | |
75 | #define BM_SOFT_RESET 0x80 | |
3a96dff0 TP |
76 | |
77 | /* SDMMC_BLKLEN bit fields */ | |
78 | #define BLKL_CRCERR_ABORT 0x0800 | |
79 | #define BLKL_CD_POL_HIGH 0x1000 | |
80 | #define BLKL_GPI_CD 0x2000 | |
81 | #define BLKL_DATA3_CD 0x4000 | |
82 | #define BLKL_INT_ENABLE 0x8000 | |
83 | ||
84 | /* SDMMC_INTMASK0 bit fields */ | |
85 | #define INT0_MBLK_TRAN_DONE_INT_EN 0x10 | |
86 | #define INT0_BLK_TRAN_DONE_INT_EN 0x20 | |
87 | #define INT0_CD_INT_EN 0x40 | |
88 | #define INT0_DI_INT_EN 0x80 | |
89 | ||
90 | /* SDMMC_INTMASK1 bit fields */ | |
91 | #define INT1_CMD_RES_TRAN_DONE_INT_EN 0x02 | |
92 | #define INT1_CMD_RES_TOUT_INT_EN 0x04 | |
93 | #define INT1_MBLK_AUTO_STOP_INT_EN 0x08 | |
94 | #define INT1_DATA_TOUT_INT_EN 0x10 | |
95 | #define INT1_RESCRC_ERR_INT_EN 0x20 | |
96 | #define INT1_RCRC_ERR_INT_EN 0x40 | |
97 | #define INT1_WCRC_ERR_INT_EN 0x80 | |
98 | ||
99 | /* SDMMC_STS0 bit fields */ | |
100 | #define STS0_WRITE_PROTECT 0x02 | |
101 | #define STS0_CD_DATA3 0x04 | |
102 | #define STS0_CD_GPI 0x08 | |
103 | #define STS0_MBLK_DONE 0x10 | |
104 | #define STS0_BLK_DONE 0x20 | |
105 | #define STS0_CARD_DETECT 0x40 | |
106 | #define STS0_DEVICE_INS 0x80 | |
107 | ||
108 | /* SDMMC_STS1 bit fields */ | |
109 | #define STS1_SDIO_INT 0x01 | |
110 | #define STS1_CMDRSP_DONE 0x02 | |
111 | #define STS1_RSP_TIMEOUT 0x04 | |
112 | #define STS1_AUTOSTOP_DONE 0x08 | |
113 | #define STS1_DATA_TIMEOUT 0x10 | |
114 | #define STS1_RSP_CRC_ERR 0x20 | |
115 | #define STS1_RCRC_ERR 0x40 | |
116 | #define STS1_WCRC_ERR 0x80 | |
117 | ||
118 | /* SDMMC_STS2 bit fields */ | |
119 | #define STS2_CMD_RES_BUSY 0x10 | |
120 | #define STS2_DATARSP_BUSY 0x20 | |
121 | #define STS2_DIS_FORCECLK 0x80 | |
122 | ||
889c9e04 AL |
123 | /* SDMMC_EXTCTRL bit fields */ |
124 | #define EXT_EIGHTBIT 0x04 | |
3a96dff0 TP |
125 | |
126 | /* MMC/SD DMA Controller Registers */ | |
127 | #define SDDMA_GCR 0x100 | |
128 | #define SDDMA_IER 0x104 | |
129 | #define SDDMA_ISR 0x108 | |
130 | #define SDDMA_DESPR 0x10C | |
131 | #define SDDMA_RBR 0x110 | |
132 | #define SDDMA_DAR 0x114 | |
133 | #define SDDMA_BAR 0x118 | |
134 | #define SDDMA_CPR 0x11C | |
135 | #define SDDMA_CCR 0x120 | |
136 | ||
137 | ||
138 | /* SDDMA_GCR bit fields */ | |
139 | #define DMA_GCR_DMA_EN 0x00000001 | |
140 | #define DMA_GCR_SOFT_RESET 0x00000100 | |
141 | ||
142 | /* SDDMA_IER bit fields */ | |
143 | #define DMA_IER_INT_EN 0x00000001 | |
144 | ||
145 | /* SDDMA_ISR bit fields */ | |
146 | #define DMA_ISR_INT_STS 0x00000001 | |
147 | ||
148 | /* SDDMA_RBR bit fields */ | |
149 | #define DMA_RBR_FORMAT 0x40000000 | |
150 | #define DMA_RBR_END 0x80000000 | |
151 | ||
152 | /* SDDMA_CCR bit fields */ | |
153 | #define DMA_CCR_RUN 0x00000080 | |
154 | #define DMA_CCR_IF_TO_PERIPHERAL 0x00000000 | |
155 | #define DMA_CCR_PERIPHERAL_TO_IF 0x00400000 | |
156 | ||
157 | /* SDDMA_CCR event status */ | |
158 | #define DMA_CCR_EVT_NO_STATUS 0x00000000 | |
159 | #define DMA_CCR_EVT_UNDERRUN 0x00000001 | |
160 | #define DMA_CCR_EVT_OVERRUN 0x00000002 | |
161 | #define DMA_CCR_EVT_DESP_READ 0x00000003 | |
162 | #define DMA_CCR_EVT_DATA_RW 0x00000004 | |
163 | #define DMA_CCR_EVT_EARLY_END 0x00000005 | |
164 | #define DMA_CCR_EVT_SUCCESS 0x0000000F | |
165 | ||
166 | #define PDMA_READ 0x00 | |
167 | #define PDMA_WRITE 0x01 | |
168 | ||
169 | #define WMT_SD_POWER_OFF 0 | |
170 | #define WMT_SD_POWER_ON 1 | |
171 | ||
172 | struct wmt_dma_descriptor { | |
173 | u32 flags; | |
174 | u32 data_buffer_addr; | |
175 | u32 branch_addr; | |
176 | u32 reserved1; | |
177 | }; | |
178 | ||
179 | struct wmt_mci_caps { | |
180 | unsigned int f_min; | |
181 | unsigned int f_max; | |
182 | u32 ocr_avail; | |
183 | u32 caps; | |
184 | u32 max_seg_size; | |
185 | u32 max_segs; | |
186 | u32 max_blk_size; | |
187 | }; | |
188 | ||
189 | struct wmt_mci_priv { | |
190 | struct mmc_host *mmc; | |
191 | void __iomem *sdmmc_base; | |
192 | ||
193 | int irq_regular; | |
194 | int irq_dma; | |
195 | ||
196 | void *dma_desc_buffer; | |
197 | dma_addr_t dma_desc_device_addr; | |
198 | ||
199 | struct completion cmdcomp; | |
200 | struct completion datacomp; | |
201 | ||
202 | struct completion *comp_cmd; | |
203 | struct completion *comp_dma; | |
204 | ||
205 | struct mmc_request *req; | |
206 | struct mmc_command *cmd; | |
207 | ||
208 | struct clk *clk_sdmmc; | |
209 | struct device *dev; | |
210 | ||
211 | u8 power_inverted; | |
212 | u8 cd_inverted; | |
213 | }; | |
214 | ||
215 | static void wmt_set_sd_power(struct wmt_mci_priv *priv, int enable) | |
216 | { | |
7b239903 AL |
217 | u32 reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); |
218 | ||
219 | if (enable ^ priv->power_inverted) | |
220 | reg_tmp &= ~BM_SD_OFF; | |
221 | else | |
222 | reg_tmp |= BM_SD_OFF; | |
223 | ||
224 | writeb(reg_tmp, priv->sdmmc_base + SDMMC_BUSMODE); | |
3a96dff0 TP |
225 | } |
226 | ||
227 | static void wmt_mci_read_response(struct mmc_host *mmc) | |
228 | { | |
229 | struct wmt_mci_priv *priv; | |
230 | int idx1, idx2; | |
231 | u8 tmp_resp; | |
232 | u32 response; | |
233 | ||
234 | priv = mmc_priv(mmc); | |
235 | ||
236 | for (idx1 = 0; idx1 < 4; idx1++) { | |
237 | response = 0; | |
238 | for (idx2 = 0; idx2 < 4; idx2++) { | |
239 | if ((idx1 == 3) && (idx2 == 3)) | |
240 | tmp_resp = readb(priv->sdmmc_base + SDMMC_RSP); | |
241 | else | |
242 | tmp_resp = readb(priv->sdmmc_base + SDMMC_RSP + | |
243 | (idx1*4) + idx2 + 1); | |
244 | response |= (tmp_resp << (idx2 * 8)); | |
245 | } | |
246 | priv->cmd->resp[idx1] = cpu_to_be32(response); | |
247 | } | |
248 | } | |
249 | ||
250 | static void wmt_mci_start_command(struct wmt_mci_priv *priv) | |
251 | { | |
252 | u32 reg_tmp; | |
253 | ||
254 | reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR); | |
255 | writeb(reg_tmp | CTLR_CMD_START, priv->sdmmc_base + SDMMC_CTLR); | |
256 | } | |
257 | ||
258 | static int wmt_mci_send_command(struct mmc_host *mmc, u8 command, u8 cmdtype, | |
259 | u32 arg, u8 rsptype) | |
260 | { | |
261 | struct wmt_mci_priv *priv; | |
262 | u32 reg_tmp; | |
263 | ||
264 | priv = mmc_priv(mmc); | |
265 | ||
266 | /* write command, arg, resptype registers */ | |
267 | writeb(command, priv->sdmmc_base + SDMMC_CMD); | |
268 | writel(arg, priv->sdmmc_base + SDMMC_ARG); | |
269 | writeb(rsptype, priv->sdmmc_base + SDMMC_RSPTYPE); | |
270 | ||
271 | /* reset response FIFO */ | |
272 | reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR); | |
273 | writeb(reg_tmp | CTLR_FIFO_RESET, priv->sdmmc_base + SDMMC_CTLR); | |
274 | ||
275 | /* ensure clock enabled - VT3465 */ | |
276 | wmt_set_sd_power(priv, WMT_SD_POWER_ON); | |
277 | ||
278 | /* clear status bits */ | |
279 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS0); | |
280 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS1); | |
281 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS2); | |
282 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS3); | |
283 | ||
284 | /* set command type */ | |
285 | reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR); | |
286 | writeb((reg_tmp & 0x0F) | (cmdtype << 4), | |
287 | priv->sdmmc_base + SDMMC_CTLR); | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | static void wmt_mci_disable_dma(struct wmt_mci_priv *priv) | |
293 | { | |
294 | writel(DMA_ISR_INT_STS, priv->sdmmc_base + SDDMA_ISR); | |
295 | writel(0, priv->sdmmc_base + SDDMA_IER); | |
296 | } | |
297 | ||
298 | static void wmt_complete_data_request(struct wmt_mci_priv *priv) | |
299 | { | |
300 | struct mmc_request *req; | |
301 | req = priv->req; | |
302 | ||
303 | req->data->bytes_xfered = req->data->blksz * req->data->blocks; | |
304 | ||
305 | /* unmap the DMA pages used for write data */ | |
306 | if (req->data->flags & MMC_DATA_WRITE) | |
307 | dma_unmap_sg(mmc_dev(priv->mmc), req->data->sg, | |
308 | req->data->sg_len, DMA_TO_DEVICE); | |
309 | else | |
310 | dma_unmap_sg(mmc_dev(priv->mmc), req->data->sg, | |
311 | req->data->sg_len, DMA_FROM_DEVICE); | |
312 | ||
313 | /* Check if the DMA ISR returned a data error */ | |
314 | if ((req->cmd->error) || (req->data->error)) | |
315 | mmc_request_done(priv->mmc, req); | |
316 | else { | |
317 | wmt_mci_read_response(priv->mmc); | |
318 | if (!req->data->stop) { | |
319 | /* single-block read/write requests end here */ | |
320 | mmc_request_done(priv->mmc, req); | |
321 | } else { | |
322 | /* | |
323 | * we change the priv->cmd variable so the response is | |
324 | * stored in the stop struct rather than the original | |
325 | * calling command struct | |
326 | */ | |
327 | priv->comp_cmd = &priv->cmdcomp; | |
328 | init_completion(priv->comp_cmd); | |
329 | priv->cmd = req->data->stop; | |
330 | wmt_mci_send_command(priv->mmc, req->data->stop->opcode, | |
331 | 7, req->data->stop->arg, 9); | |
332 | wmt_mci_start_command(priv); | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
337 | static irqreturn_t wmt_mci_dma_isr(int irq_num, void *data) | |
338 | { | |
3a96dff0 TP |
339 | struct wmt_mci_priv *priv; |
340 | ||
341 | int status; | |
342 | ||
343 | priv = (struct wmt_mci_priv *)data; | |
3a96dff0 TP |
344 | |
345 | status = readl(priv->sdmmc_base + SDDMA_CCR) & 0x0F; | |
346 | ||
347 | if (status != DMA_CCR_EVT_SUCCESS) { | |
348 | dev_err(priv->dev, "DMA Error: Status = %d\n", status); | |
349 | priv->req->data->error = -ETIMEDOUT; | |
350 | complete(priv->comp_dma); | |
351 | return IRQ_HANDLED; | |
352 | } | |
353 | ||
354 | priv->req->data->error = 0; | |
355 | ||
356 | wmt_mci_disable_dma(priv); | |
357 | ||
358 | complete(priv->comp_dma); | |
359 | ||
360 | if (priv->comp_cmd) { | |
361 | if (completion_done(priv->comp_cmd)) { | |
362 | /* | |
363 | * if the command (regular) interrupt has already | |
364 | * completed, finish off the request otherwise we wait | |
365 | * for the command interrupt and finish from there. | |
366 | */ | |
367 | wmt_complete_data_request(priv); | |
368 | } | |
369 | } | |
370 | ||
371 | return IRQ_HANDLED; | |
372 | } | |
373 | ||
374 | static irqreturn_t wmt_mci_regular_isr(int irq_num, void *data) | |
375 | { | |
376 | struct wmt_mci_priv *priv; | |
377 | u32 status0; | |
378 | u32 status1; | |
379 | u32 status2; | |
380 | u32 reg_tmp; | |
381 | int cmd_done; | |
382 | ||
383 | priv = (struct wmt_mci_priv *)data; | |
384 | cmd_done = 0; | |
385 | status0 = readb(priv->sdmmc_base + SDMMC_STS0); | |
386 | status1 = readb(priv->sdmmc_base + SDMMC_STS1); | |
387 | status2 = readb(priv->sdmmc_base + SDMMC_STS2); | |
388 | ||
389 | /* Check for card insertion */ | |
390 | reg_tmp = readb(priv->sdmmc_base + SDMMC_INTMASK0); | |
391 | if ((reg_tmp & INT0_DI_INT_EN) && (status0 & STS0_DEVICE_INS)) { | |
392 | mmc_detect_change(priv->mmc, 0); | |
393 | if (priv->cmd) | |
394 | priv->cmd->error = -ETIMEDOUT; | |
395 | if (priv->comp_cmd) | |
396 | complete(priv->comp_cmd); | |
397 | if (priv->comp_dma) { | |
398 | wmt_mci_disable_dma(priv); | |
399 | complete(priv->comp_dma); | |
400 | } | |
401 | writeb(STS0_DEVICE_INS, priv->sdmmc_base + SDMMC_STS0); | |
402 | return IRQ_HANDLED; | |
403 | } | |
404 | ||
405 | if ((!priv->req->data) || | |
406 | ((priv->req->data->stop) && (priv->cmd == priv->req->data->stop))) { | |
407 | /* handle non-data & stop_transmission requests */ | |
408 | if (status1 & STS1_CMDRSP_DONE) { | |
409 | priv->cmd->error = 0; | |
410 | cmd_done = 1; | |
411 | } else if ((status1 & STS1_RSP_TIMEOUT) || | |
412 | (status1 & STS1_DATA_TIMEOUT)) { | |
413 | priv->cmd->error = -ETIMEDOUT; | |
414 | cmd_done = 1; | |
415 | } | |
416 | ||
417 | if (cmd_done) { | |
418 | priv->comp_cmd = NULL; | |
419 | ||
420 | if (!priv->cmd->error) | |
421 | wmt_mci_read_response(priv->mmc); | |
422 | ||
423 | priv->cmd = NULL; | |
424 | ||
425 | mmc_request_done(priv->mmc, priv->req); | |
426 | } | |
427 | } else { | |
428 | /* handle data requests */ | |
429 | if (status1 & STS1_CMDRSP_DONE) { | |
430 | if (priv->cmd) | |
431 | priv->cmd->error = 0; | |
432 | if (priv->comp_cmd) | |
433 | complete(priv->comp_cmd); | |
434 | } | |
435 | ||
436 | if ((status1 & STS1_RSP_TIMEOUT) || | |
437 | (status1 & STS1_DATA_TIMEOUT)) { | |
438 | if (priv->cmd) | |
439 | priv->cmd->error = -ETIMEDOUT; | |
440 | if (priv->comp_cmd) | |
441 | complete(priv->comp_cmd); | |
442 | if (priv->comp_dma) { | |
443 | wmt_mci_disable_dma(priv); | |
444 | complete(priv->comp_dma); | |
445 | } | |
446 | } | |
447 | ||
448 | if (priv->comp_dma) { | |
449 | /* | |
450 | * If the dma interrupt has already completed, finish | |
451 | * off the request; otherwise we wait for the DMA | |
452 | * interrupt and finish from there. | |
453 | */ | |
454 | if (completion_done(priv->comp_dma)) | |
455 | wmt_complete_data_request(priv); | |
456 | } | |
457 | } | |
458 | ||
459 | writeb(status0, priv->sdmmc_base + SDMMC_STS0); | |
460 | writeb(status1, priv->sdmmc_base + SDMMC_STS1); | |
461 | writeb(status2, priv->sdmmc_base + SDMMC_STS2); | |
462 | ||
463 | return IRQ_HANDLED; | |
464 | } | |
465 | ||
466 | static void wmt_reset_hardware(struct mmc_host *mmc) | |
467 | { | |
468 | struct wmt_mci_priv *priv; | |
469 | u32 reg_tmp; | |
470 | ||
471 | priv = mmc_priv(mmc); | |
472 | ||
473 | /* reset controller */ | |
474 | reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); | |
475 | writeb(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + SDMMC_BUSMODE); | |
476 | ||
477 | /* reset response FIFO */ | |
478 | reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR); | |
479 | writeb(reg_tmp | CTLR_FIFO_RESET, priv->sdmmc_base + SDMMC_CTLR); | |
480 | ||
481 | /* enable GPI pin to detect card */ | |
482 | writew(BLKL_INT_ENABLE | BLKL_GPI_CD, priv->sdmmc_base + SDMMC_BLKLEN); | |
483 | ||
484 | /* clear interrupt status */ | |
485 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS0); | |
486 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS1); | |
487 | ||
488 | /* setup interrupts */ | |
489 | writeb(INT0_CD_INT_EN | INT0_DI_INT_EN, priv->sdmmc_base + | |
490 | SDMMC_INTMASK0); | |
491 | writeb(INT1_DATA_TOUT_INT_EN | INT1_CMD_RES_TRAN_DONE_INT_EN | | |
492 | INT1_CMD_RES_TOUT_INT_EN, priv->sdmmc_base + SDMMC_INTMASK1); | |
493 | ||
494 | /* set the DMA timeout */ | |
495 | writew(8191, priv->sdmmc_base + SDMMC_DMATIMEOUT); | |
496 | ||
497 | /* auto clock freezing enable */ | |
498 | reg_tmp = readb(priv->sdmmc_base + SDMMC_STS2); | |
499 | writeb(reg_tmp | STS2_DIS_FORCECLK, priv->sdmmc_base + SDMMC_STS2); | |
500 | ||
501 | /* set a default clock speed of 400Khz */ | |
502 | clk_set_rate(priv->clk_sdmmc, 400000); | |
503 | } | |
504 | ||
505 | static int wmt_dma_init(struct mmc_host *mmc) | |
506 | { | |
507 | struct wmt_mci_priv *priv; | |
508 | ||
509 | priv = mmc_priv(mmc); | |
510 | ||
511 | writel(DMA_GCR_SOFT_RESET, priv->sdmmc_base + SDDMA_GCR); | |
512 | writel(DMA_GCR_DMA_EN, priv->sdmmc_base + SDDMA_GCR); | |
513 | if ((readl(priv->sdmmc_base + SDDMA_GCR) & DMA_GCR_DMA_EN) != 0) | |
514 | return 0; | |
515 | else | |
516 | return 1; | |
517 | } | |
518 | ||
519 | static void wmt_dma_init_descriptor(struct wmt_dma_descriptor *desc, | |
520 | u16 req_count, u32 buffer_addr, u32 branch_addr, int end) | |
521 | { | |
522 | desc->flags = 0x40000000 | req_count; | |
523 | if (end) | |
524 | desc->flags |= 0x80000000; | |
525 | desc->data_buffer_addr = buffer_addr; | |
526 | desc->branch_addr = branch_addr; | |
527 | } | |
528 | ||
529 | static void wmt_dma_config(struct mmc_host *mmc, u32 descaddr, u8 dir) | |
530 | { | |
531 | struct wmt_mci_priv *priv; | |
532 | u32 reg_tmp; | |
533 | ||
534 | priv = mmc_priv(mmc); | |
535 | ||
536 | /* Enable DMA Interrupts */ | |
537 | writel(DMA_IER_INT_EN, priv->sdmmc_base + SDDMA_IER); | |
538 | ||
539 | /* Write DMA Descriptor Pointer Register */ | |
540 | writel(descaddr, priv->sdmmc_base + SDDMA_DESPR); | |
541 | ||
542 | writel(0x00, priv->sdmmc_base + SDDMA_CCR); | |
543 | ||
544 | if (dir == PDMA_WRITE) { | |
545 | reg_tmp = readl(priv->sdmmc_base + SDDMA_CCR); | |
546 | writel(reg_tmp & DMA_CCR_IF_TO_PERIPHERAL, priv->sdmmc_base + | |
547 | SDDMA_CCR); | |
548 | } else { | |
549 | reg_tmp = readl(priv->sdmmc_base + SDDMA_CCR); | |
550 | writel(reg_tmp | DMA_CCR_PERIPHERAL_TO_IF, priv->sdmmc_base + | |
551 | SDDMA_CCR); | |
552 | } | |
553 | } | |
554 | ||
555 | static void wmt_dma_start(struct wmt_mci_priv *priv) | |
556 | { | |
557 | u32 reg_tmp; | |
558 | ||
559 | reg_tmp = readl(priv->sdmmc_base + SDDMA_CCR); | |
560 | writel(reg_tmp | DMA_CCR_RUN, priv->sdmmc_base + SDDMA_CCR); | |
561 | } | |
562 | ||
563 | static void wmt_mci_request(struct mmc_host *mmc, struct mmc_request *req) | |
564 | { | |
565 | struct wmt_mci_priv *priv; | |
566 | struct wmt_dma_descriptor *desc; | |
567 | u8 command; | |
568 | u8 cmdtype; | |
569 | u32 arg; | |
570 | u8 rsptype; | |
571 | u32 reg_tmp; | |
572 | ||
573 | struct scatterlist *sg; | |
574 | int i; | |
575 | int sg_cnt; | |
576 | int offset; | |
577 | u32 dma_address; | |
578 | int desc_cnt; | |
579 | ||
580 | priv = mmc_priv(mmc); | |
581 | priv->req = req; | |
582 | ||
583 | /* | |
584 | * Use the cmd variable to pass a pointer to the resp[] structure | |
585 | * This is required on multi-block requests to pass the pointer to the | |
586 | * stop command | |
587 | */ | |
588 | priv->cmd = req->cmd; | |
589 | ||
590 | command = req->cmd->opcode; | |
591 | arg = req->cmd->arg; | |
592 | rsptype = mmc_resp_type(req->cmd); | |
593 | cmdtype = 0; | |
594 | ||
595 | /* rsptype=7 only valid for SPI commands - should be =2 for SD */ | |
596 | if (rsptype == 7) | |
597 | rsptype = 2; | |
598 | /* rsptype=21 is R1B, convert for controller */ | |
599 | if (rsptype == 21) | |
600 | rsptype = 9; | |
601 | ||
602 | if (!req->data) { | |
603 | wmt_mci_send_command(mmc, command, cmdtype, arg, rsptype); | |
604 | wmt_mci_start_command(priv); | |
605 | /* completion is now handled in the regular_isr() */ | |
606 | } | |
607 | if (req->data) { | |
608 | priv->comp_cmd = &priv->cmdcomp; | |
609 | init_completion(priv->comp_cmd); | |
610 | ||
611 | wmt_dma_init(mmc); | |
612 | ||
613 | /* set controller data length */ | |
614 | reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN); | |
615 | writew((reg_tmp & 0xF800) | (req->data->blksz - 1), | |
616 | priv->sdmmc_base + SDMMC_BLKLEN); | |
617 | ||
618 | /* set controller block count */ | |
619 | writew(req->data->blocks, priv->sdmmc_base + SDMMC_BLKCNT); | |
620 | ||
621 | desc = (struct wmt_dma_descriptor *)priv->dma_desc_buffer; | |
622 | ||
623 | if (req->data->flags & MMC_DATA_WRITE) { | |
624 | sg_cnt = dma_map_sg(mmc_dev(mmc), req->data->sg, | |
625 | req->data->sg_len, DMA_TO_DEVICE); | |
626 | cmdtype = 1; | |
627 | if (req->data->blocks > 1) | |
628 | cmdtype = 3; | |
629 | } else { | |
630 | sg_cnt = dma_map_sg(mmc_dev(mmc), req->data->sg, | |
631 | req->data->sg_len, DMA_FROM_DEVICE); | |
632 | cmdtype = 2; | |
633 | if (req->data->blocks > 1) | |
634 | cmdtype = 4; | |
635 | } | |
636 | ||
637 | dma_address = priv->dma_desc_device_addr + 16; | |
638 | desc_cnt = 0; | |
639 | ||
640 | for_each_sg(req->data->sg, sg, sg_cnt, i) { | |
641 | offset = 0; | |
642 | while (offset < sg_dma_len(sg)) { | |
643 | wmt_dma_init_descriptor(desc, req->data->blksz, | |
644 | sg_dma_address(sg)+offset, | |
645 | dma_address, 0); | |
646 | desc++; | |
647 | desc_cnt++; | |
648 | offset += req->data->blksz; | |
649 | dma_address += 16; | |
650 | if (desc_cnt == req->data->blocks) | |
651 | break; | |
652 | } | |
653 | } | |
654 | desc--; | |
655 | desc->flags |= 0x80000000; | |
656 | ||
657 | if (req->data->flags & MMC_DATA_WRITE) | |
658 | wmt_dma_config(mmc, priv->dma_desc_device_addr, | |
659 | PDMA_WRITE); | |
660 | else | |
661 | wmt_dma_config(mmc, priv->dma_desc_device_addr, | |
662 | PDMA_READ); | |
663 | ||
664 | wmt_mci_send_command(mmc, command, cmdtype, arg, rsptype); | |
665 | ||
666 | priv->comp_dma = &priv->datacomp; | |
667 | init_completion(priv->comp_dma); | |
668 | ||
669 | wmt_dma_start(priv); | |
670 | wmt_mci_start_command(priv); | |
671 | } | |
672 | } | |
673 | ||
674 | static void wmt_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) | |
675 | { | |
676 | struct wmt_mci_priv *priv; | |
889c9e04 | 677 | u32 busmode, extctrl; |
3a96dff0 TP |
678 | |
679 | priv = mmc_priv(mmc); | |
680 | ||
681 | if (ios->power_mode == MMC_POWER_UP) { | |
682 | wmt_reset_hardware(mmc); | |
683 | ||
684 | wmt_set_sd_power(priv, WMT_SD_POWER_ON); | |
685 | } | |
686 | if (ios->power_mode == MMC_POWER_OFF) | |
687 | wmt_set_sd_power(priv, WMT_SD_POWER_OFF); | |
688 | ||
689 | if (ios->clock != 0) | |
690 | clk_set_rate(priv->clk_sdmmc, ios->clock); | |
691 | ||
889c9e04 AL |
692 | busmode = readb(priv->sdmmc_base + SDMMC_BUSMODE); |
693 | extctrl = readb(priv->sdmmc_base + SDMMC_EXTCTRL); | |
694 | ||
695 | busmode &= ~(BM_EIGHTBIT_MODE | BM_FOURBIT_MODE); | |
696 | extctrl &= ~EXT_EIGHTBIT; | |
697 | ||
3a96dff0 TP |
698 | switch (ios->bus_width) { |
699 | case MMC_BUS_WIDTH_8: | |
889c9e04 AL |
700 | busmode |= BM_EIGHTBIT_MODE; |
701 | extctrl |= EXT_EIGHTBIT; | |
3a96dff0 TP |
702 | break; |
703 | case MMC_BUS_WIDTH_4: | |
889c9e04 | 704 | busmode |= BM_FOURBIT_MODE; |
3a96dff0 TP |
705 | break; |
706 | case MMC_BUS_WIDTH_1: | |
3a96dff0 TP |
707 | break; |
708 | } | |
889c9e04 AL |
709 | |
710 | writeb(busmode, priv->sdmmc_base + SDMMC_BUSMODE); | |
711 | writeb(extctrl, priv->sdmmc_base + SDMMC_EXTCTRL); | |
3a96dff0 TP |
712 | } |
713 | ||
714 | static int wmt_mci_get_ro(struct mmc_host *mmc) | |
715 | { | |
716 | struct wmt_mci_priv *priv = mmc_priv(mmc); | |
717 | ||
718 | return !(readb(priv->sdmmc_base + SDMMC_STS0) & STS0_WRITE_PROTECT); | |
719 | } | |
720 | ||
721 | static int wmt_mci_get_cd(struct mmc_host *mmc) | |
722 | { | |
723 | struct wmt_mci_priv *priv = mmc_priv(mmc); | |
724 | u32 cd = (readb(priv->sdmmc_base + SDMMC_STS0) & STS0_CD_GPI) >> 3; | |
725 | ||
726 | return !(cd ^ priv->cd_inverted); | |
727 | } | |
728 | ||
729 | static struct mmc_host_ops wmt_mci_ops = { | |
730 | .request = wmt_mci_request, | |
731 | .set_ios = wmt_mci_set_ios, | |
732 | .get_ro = wmt_mci_get_ro, | |
733 | .get_cd = wmt_mci_get_cd, | |
734 | }; | |
735 | ||
736 | /* Controller capabilities */ | |
737 | static struct wmt_mci_caps wm8505_caps = { | |
738 | .f_min = 390425, | |
739 | .f_max = 50000000, | |
740 | .ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34, | |
741 | .caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MMC_HIGHSPEED | | |
742 | MMC_CAP_SD_HIGHSPEED, | |
743 | .max_seg_size = 65024, | |
744 | .max_segs = 128, | |
745 | .max_blk_size = 2048, | |
746 | }; | |
747 | ||
2530fd73 | 748 | static const struct of_device_id wmt_mci_dt_ids[] = { |
3a96dff0 TP |
749 | { .compatible = "wm,wm8505-sdhc", .data = &wm8505_caps }, |
750 | { /* Sentinel */ }, | |
751 | }; | |
752 | ||
4e608e4e | 753 | static int wmt_mci_probe(struct platform_device *pdev) |
3a96dff0 TP |
754 | { |
755 | struct mmc_host *mmc; | |
756 | struct wmt_mci_priv *priv; | |
757 | struct device_node *np = pdev->dev.of_node; | |
758 | const struct of_device_id *of_id = | |
759 | of_match_device(wmt_mci_dt_ids, &pdev->dev); | |
43aaa50f | 760 | const struct wmt_mci_caps *wmt_caps; |
3a96dff0 TP |
761 | int ret; |
762 | int regular_irq, dma_irq; | |
763 | ||
764 | if (!of_id || !of_id->data) { | |
765 | dev_err(&pdev->dev, "Controller capabilities data missing\n"); | |
766 | return -EFAULT; | |
767 | } | |
768 | ||
43aaa50f SK |
769 | wmt_caps = of_id->data; |
770 | ||
3a96dff0 TP |
771 | if (!np) { |
772 | dev_err(&pdev->dev, "Missing SDMMC description in devicetree\n"); | |
773 | return -EFAULT; | |
774 | } | |
775 | ||
776 | regular_irq = irq_of_parse_and_map(np, 0); | |
777 | dma_irq = irq_of_parse_and_map(np, 1); | |
778 | ||
779 | if (!regular_irq || !dma_irq) { | |
780 | dev_err(&pdev->dev, "Getting IRQs failed!\n"); | |
781 | ret = -ENXIO; | |
782 | goto fail1; | |
783 | } | |
784 | ||
785 | mmc = mmc_alloc_host(sizeof(struct wmt_mci_priv), &pdev->dev); | |
786 | if (!mmc) { | |
787 | dev_err(&pdev->dev, "Failed to allocate mmc_host\n"); | |
788 | ret = -ENOMEM; | |
789 | goto fail1; | |
790 | } | |
791 | ||
792 | mmc->ops = &wmt_mci_ops; | |
793 | mmc->f_min = wmt_caps->f_min; | |
794 | mmc->f_max = wmt_caps->f_max; | |
795 | mmc->ocr_avail = wmt_caps->ocr_avail; | |
796 | mmc->caps = wmt_caps->caps; | |
797 | ||
798 | mmc->max_seg_size = wmt_caps->max_seg_size; | |
799 | mmc->max_segs = wmt_caps->max_segs; | |
800 | mmc->max_blk_size = wmt_caps->max_blk_size; | |
801 | ||
802 | mmc->max_req_size = (16*512*mmc->max_segs); | |
803 | mmc->max_blk_count = mmc->max_req_size / 512; | |
804 | ||
805 | priv = mmc_priv(mmc); | |
806 | priv->mmc = mmc; | |
807 | priv->dev = &pdev->dev; | |
808 | ||
809 | priv->power_inverted = 0; | |
810 | priv->cd_inverted = 0; | |
811 | ||
812 | if (of_get_property(np, "sdon-inverted", NULL)) | |
813 | priv->power_inverted = 1; | |
814 | if (of_get_property(np, "cd-inverted", NULL)) | |
815 | priv->cd_inverted = 1; | |
816 | ||
817 | priv->sdmmc_base = of_iomap(np, 0); | |
818 | if (!priv->sdmmc_base) { | |
819 | dev_err(&pdev->dev, "Failed to map IO space\n"); | |
820 | ret = -ENOMEM; | |
821 | goto fail2; | |
822 | } | |
823 | ||
824 | priv->irq_regular = regular_irq; | |
825 | priv->irq_dma = dma_irq; | |
826 | ||
827 | ret = request_irq(regular_irq, wmt_mci_regular_isr, 0, "sdmmc", priv); | |
828 | if (ret) { | |
829 | dev_err(&pdev->dev, "Register regular IRQ fail\n"); | |
830 | goto fail3; | |
831 | } | |
832 | ||
5c87456b | 833 | ret = request_irq(dma_irq, wmt_mci_dma_isr, 0, "sdmmc", priv); |
3a96dff0 TP |
834 | if (ret) { |
835 | dev_err(&pdev->dev, "Register DMA IRQ fail\n"); | |
836 | goto fail4; | |
837 | } | |
838 | ||
839 | /* alloc some DMA buffers for descriptors/transfers */ | |
840 | priv->dma_desc_buffer = dma_alloc_coherent(&pdev->dev, | |
841 | mmc->max_blk_count * 16, | |
842 | &priv->dma_desc_device_addr, | |
6f243f63 | 843 | GFP_KERNEL); |
3a96dff0 TP |
844 | if (!priv->dma_desc_buffer) { |
845 | dev_err(&pdev->dev, "DMA alloc fail\n"); | |
846 | ret = -EPERM; | |
847 | goto fail5; | |
848 | } | |
849 | ||
850 | platform_set_drvdata(pdev, mmc); | |
851 | ||
852 | priv->clk_sdmmc = of_clk_get(np, 0); | |
853 | if (IS_ERR(priv->clk_sdmmc)) { | |
854 | dev_err(&pdev->dev, "Error getting clock\n"); | |
855 | ret = PTR_ERR(priv->clk_sdmmc); | |
856 | goto fail5; | |
857 | } | |
858 | ||
859 | clk_prepare_enable(priv->clk_sdmmc); | |
860 | ||
861 | /* configure the controller to a known 'ready' state */ | |
862 | wmt_reset_hardware(mmc); | |
863 | ||
864 | mmc_add_host(mmc); | |
865 | ||
866 | dev_info(&pdev->dev, "WMT SDHC Controller initialized\n"); | |
867 | ||
868 | return 0; | |
869 | fail5: | |
870 | free_irq(dma_irq, priv); | |
871 | fail4: | |
872 | free_irq(regular_irq, priv); | |
873 | fail3: | |
874 | iounmap(priv->sdmmc_base); | |
875 | fail2: | |
876 | mmc_free_host(mmc); | |
877 | fail1: | |
878 | return ret; | |
879 | } | |
880 | ||
4e608e4e | 881 | static int wmt_mci_remove(struct platform_device *pdev) |
3a96dff0 TP |
882 | { |
883 | struct mmc_host *mmc; | |
884 | struct wmt_mci_priv *priv; | |
885 | struct resource *res; | |
886 | u32 reg_tmp; | |
887 | ||
888 | mmc = platform_get_drvdata(pdev); | |
889 | priv = mmc_priv(mmc); | |
890 | ||
891 | /* reset SD controller */ | |
892 | reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); | |
893 | writel(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + SDMMC_BUSMODE); | |
894 | reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN); | |
895 | writew(reg_tmp & ~(0xA000), priv->sdmmc_base + SDMMC_BLKLEN); | |
896 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS0); | |
897 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS1); | |
898 | ||
899 | /* release the dma buffers */ | |
900 | dma_free_coherent(&pdev->dev, priv->mmc->max_blk_count * 16, | |
901 | priv->dma_desc_buffer, priv->dma_desc_device_addr); | |
902 | ||
903 | mmc_remove_host(mmc); | |
904 | ||
905 | free_irq(priv->irq_regular, priv); | |
906 | free_irq(priv->irq_dma, priv); | |
907 | ||
908 | iounmap(priv->sdmmc_base); | |
909 | ||
910 | clk_disable_unprepare(priv->clk_sdmmc); | |
911 | clk_put(priv->clk_sdmmc); | |
912 | ||
913 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
22119901 | 914 | release_mem_region(res->start, resource_size(res)); |
3a96dff0 TP |
915 | |
916 | mmc_free_host(mmc); | |
917 | ||
3a96dff0 TP |
918 | dev_info(&pdev->dev, "WMT MCI device removed\n"); |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | #ifdef CONFIG_PM | |
924 | static int wmt_mci_suspend(struct device *dev) | |
925 | { | |
926 | u32 reg_tmp; | |
927 | struct platform_device *pdev = to_platform_device(dev); | |
928 | struct mmc_host *mmc = platform_get_drvdata(pdev); | |
929 | struct wmt_mci_priv *priv; | |
3a96dff0 TP |
930 | |
931 | if (!mmc) | |
932 | return 0; | |
933 | ||
934 | priv = mmc_priv(mmc); | |
7af37663 UH |
935 | reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); |
936 | writeb(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + | |
937 | SDMMC_BUSMODE); | |
3a96dff0 | 938 | |
7af37663 UH |
939 | reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN); |
940 | writew(reg_tmp & 0x5FFF, priv->sdmmc_base + SDMMC_BLKLEN); | |
3a96dff0 | 941 | |
7af37663 UH |
942 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS0); |
943 | writeb(0xFF, priv->sdmmc_base + SDMMC_STS1); | |
3a96dff0 | 944 | |
7af37663 UH |
945 | clk_disable(priv->clk_sdmmc); |
946 | return 0; | |
3a96dff0 TP |
947 | } |
948 | ||
949 | static int wmt_mci_resume(struct device *dev) | |
950 | { | |
951 | u32 reg_tmp; | |
952 | struct platform_device *pdev = to_platform_device(dev); | |
953 | struct mmc_host *mmc = platform_get_drvdata(pdev); | |
954 | struct wmt_mci_priv *priv; | |
3a96dff0 TP |
955 | |
956 | if (mmc) { | |
957 | priv = mmc_priv(mmc); | |
958 | clk_enable(priv->clk_sdmmc); | |
959 | ||
960 | reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); | |
961 | writeb(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + | |
962 | SDMMC_BUSMODE); | |
963 | ||
964 | reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN); | |
965 | writew(reg_tmp | (BLKL_GPI_CD | BLKL_INT_ENABLE), | |
966 | priv->sdmmc_base + SDMMC_BLKLEN); | |
967 | ||
968 | reg_tmp = readb(priv->sdmmc_base + SDMMC_INTMASK0); | |
969 | writeb(reg_tmp | INT0_DI_INT_EN, priv->sdmmc_base + | |
970 | SDMMC_INTMASK0); | |
971 | ||
3a96dff0 TP |
972 | } |
973 | ||
7af37663 | 974 | return 0; |
3a96dff0 TP |
975 | } |
976 | ||
977 | static const struct dev_pm_ops wmt_mci_pm = { | |
978 | .suspend = wmt_mci_suspend, | |
979 | .resume = wmt_mci_resume, | |
980 | }; | |
981 | ||
982 | #define wmt_mci_pm_ops (&wmt_mci_pm) | |
983 | ||
984 | #else /* !CONFIG_PM */ | |
985 | ||
986 | #define wmt_mci_pm_ops NULL | |
987 | ||
988 | #endif | |
989 | ||
990 | static struct platform_driver wmt_mci_driver = { | |
991 | .probe = wmt_mci_probe, | |
893613b0 | 992 | .remove = wmt_mci_remove, |
3a96dff0 TP |
993 | .driver = { |
994 | .name = DRIVER_NAME, | |
3a96dff0 TP |
995 | .pm = wmt_mci_pm_ops, |
996 | .of_match_table = wmt_mci_dt_ids, | |
997 | }, | |
998 | }; | |
999 | ||
1000 | module_platform_driver(wmt_mci_driver); | |
1001 | ||
1002 | MODULE_DESCRIPTION("Wondermedia MMC/SD Driver"); | |
1003 | MODULE_AUTHOR("Tony Prisk"); | |
1004 | MODULE_LICENSE("GPL v2"); | |
1005 | MODULE_DEVICE_TABLE(of, wmt_mci_dt_ids); |