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236caa7c MS |
1 | /* |
2 | * Marvell MMC/SD/SDIO driver | |
3 | * | |
4 | * Authors: Maen Suleiman, Nicolas Pitre | |
5 | * Copyright (C) 2008-2009 Marvell Ltd. | |
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/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/mbus.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/dma-mapping.h> | |
20 | #include <linux/scatterlist.h> | |
21 | #include <linux/irq.h> | |
f4f7561e | 22 | #include <linux/clk.h> |
111936ff | 23 | #include <linux/of_irq.h> |
236caa7c | 24 | #include <linux/mmc/host.h> |
3724482d | 25 | #include <linux/mmc/slot-gpio.h> |
236caa7c MS |
26 | |
27 | #include <asm/sizes.h> | |
28 | #include <asm/unaligned.h> | |
236caa7c MS |
29 | |
30 | #include "mvsdio.h" | |
31 | ||
32 | #define DRIVER_NAME "mvsdio" | |
33 | ||
2cd17224 | 34 | static int maxfreq; |
236caa7c MS |
35 | static int nodma; |
36 | ||
37 | struct mvsd_host { | |
38 | void __iomem *base; | |
39 | struct mmc_request *mrq; | |
40 | spinlock_t lock; | |
41 | unsigned int xfer_mode; | |
42 | unsigned int intr_en; | |
43 | unsigned int ctrl; | |
44 | unsigned int pio_size; | |
45 | void *pio_ptr; | |
46 | unsigned int sg_frags; | |
47 | unsigned int ns_per_clk; | |
48 | unsigned int clock; | |
49 | unsigned int base_clock; | |
50 | struct timer_list timer; | |
51 | struct mmc_host *mmc; | |
52 | struct device *dev; | |
f4f7561e | 53 | struct clk *clk; |
236caa7c MS |
54 | }; |
55 | ||
56 | #define mvsd_write(offs, val) writel(val, iobase + (offs)) | |
57 | #define mvsd_read(offs) readl(iobase + (offs)) | |
58 | ||
59 | static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data) | |
60 | { | |
61 | void __iomem *iobase = host->base; | |
62 | unsigned int tmout; | |
63 | int tmout_index; | |
64 | ||
a6d297f0 NP |
65 | /* |
66 | * Hardware weirdness. The FIFO_EMPTY bit of the HW_STATE | |
67 | * register is sometimes not set before a while when some | |
68 | * "unusual" data block sizes are used (such as with the SWITCH | |
69 | * command), even despite the fact that the XFER_DONE interrupt | |
70 | * was raised. And if another data transfer starts before | |
71 | * this bit comes to good sense (which eventually happens by | |
72 | * itself) then the new transfer simply fails with a timeout. | |
73 | */ | |
74 | if (!(mvsd_read(MVSD_HW_STATE) & (1 << 13))) { | |
75 | unsigned long t = jiffies + HZ; | |
76 | unsigned int hw_state, count = 0; | |
77 | do { | |
d7fe833f | 78 | hw_state = mvsd_read(MVSD_HW_STATE); |
a6d297f0 NP |
79 | if (time_after(jiffies, t)) { |
80 | dev_warn(host->dev, "FIFO_EMPTY bit missing\n"); | |
81 | break; | |
82 | } | |
a6d297f0 NP |
83 | count++; |
84 | } while (!(hw_state & (1 << 13))); | |
85 | dev_dbg(host->dev, "*** wait for FIFO_EMPTY bit " | |
86 | "(hw=0x%04x, count=%d, jiffies=%ld)\n", | |
87 | hw_state, count, jiffies - (t - HZ)); | |
88 | } | |
89 | ||
236caa7c MS |
90 | /* If timeout=0 then maximum timeout index is used. */ |
91 | tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk); | |
92 | tmout += data->timeout_clks; | |
93 | tmout_index = fls(tmout - 1) - 12; | |
94 | if (tmout_index < 0) | |
95 | tmout_index = 0; | |
96 | if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX) | |
97 | tmout_index = MVSD_HOST_CTRL_TMOUT_MAX; | |
98 | ||
99 | dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n", | |
100 | (data->flags & MMC_DATA_READ) ? "read" : "write", | |
101 | (u32)sg_virt(data->sg), data->blocks, data->blksz, | |
102 | tmout, tmout_index); | |
103 | ||
104 | host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK; | |
105 | host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index); | |
106 | mvsd_write(MVSD_HOST_CTRL, host->ctrl); | |
107 | mvsd_write(MVSD_BLK_COUNT, data->blocks); | |
108 | mvsd_write(MVSD_BLK_SIZE, data->blksz); | |
109 | ||
3c583f70 AL |
110 | if (nodma || (data->blksz | data->sg->offset) & 3 || |
111 | ((!(data->flags & MMC_DATA_READ) && data->sg->offset & 0x3f))) { | |
236caa7c MS |
112 | /* |
113 | * We cannot do DMA on a buffer which offset or size | |
114 | * is not aligned on a 4-byte boundary. | |
3c583f70 AL |
115 | * |
116 | * It also appears the host to card DMA can corrupt | |
117 | * data when the buffer is not aligned on a 64 byte | |
118 | * boundary. | |
236caa7c MS |
119 | */ |
120 | host->pio_size = data->blocks * data->blksz; | |
121 | host->pio_ptr = sg_virt(data->sg); | |
122 | if (!nodma) | |
e573d698 TP |
123 | dev_dbg(host->dev, "fallback to PIO for data at 0x%p size %d\n", |
124 | host->pio_ptr, host->pio_size); | |
236caa7c MS |
125 | return 1; |
126 | } else { | |
127 | dma_addr_t phys_addr; | |
feeef096 HK |
128 | |
129 | host->sg_frags = dma_map_sg(mmc_dev(host->mmc), | |
130 | data->sg, data->sg_len, | |
131 | mmc_get_dma_dir(data)); | |
236caa7c MS |
132 | phys_addr = sg_dma_address(data->sg); |
133 | mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff); | |
134 | mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16); | |
135 | return 0; | |
136 | } | |
137 | } | |
138 | ||
139 | static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq) | |
140 | { | |
141 | struct mvsd_host *host = mmc_priv(mmc); | |
142 | void __iomem *iobase = host->base; | |
143 | struct mmc_command *cmd = mrq->cmd; | |
144 | u32 cmdreg = 0, xfer = 0, intr = 0; | |
145 | unsigned long flags; | |
0ef89ec2 | 146 | unsigned int timeout; |
236caa7c MS |
147 | |
148 | BUG_ON(host->mrq != NULL); | |
149 | host->mrq = mrq; | |
150 | ||
151 | dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n", | |
152 | cmd->opcode, mvsd_read(MVSD_HW_STATE)); | |
153 | ||
154 | cmdreg = MVSD_CMD_INDEX(cmd->opcode); | |
155 | ||
156 | if (cmd->flags & MMC_RSP_BUSY) | |
157 | cmdreg |= MVSD_CMD_RSP_48BUSY; | |
158 | else if (cmd->flags & MMC_RSP_136) | |
159 | cmdreg |= MVSD_CMD_RSP_136; | |
160 | else if (cmd->flags & MMC_RSP_PRESENT) | |
161 | cmdreg |= MVSD_CMD_RSP_48; | |
162 | else | |
163 | cmdreg |= MVSD_CMD_RSP_NONE; | |
164 | ||
165 | if (cmd->flags & MMC_RSP_CRC) | |
166 | cmdreg |= MVSD_CMD_CHECK_CMDCRC; | |
167 | ||
168 | if (cmd->flags & MMC_RSP_OPCODE) | |
169 | cmdreg |= MVSD_CMD_INDX_CHECK; | |
170 | ||
171 | if (cmd->flags & MMC_RSP_PRESENT) { | |
172 | cmdreg |= MVSD_UNEXPECTED_RESP; | |
173 | intr |= MVSD_NOR_UNEXP_RSP; | |
174 | } | |
175 | ||
176 | if (mrq->data) { | |
177 | struct mmc_data *data = mrq->data; | |
178 | int pio; | |
179 | ||
180 | cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16; | |
181 | xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN; | |
182 | if (data->flags & MMC_DATA_READ) | |
183 | xfer |= MVSD_XFER_MODE_TO_HOST; | |
184 | ||
185 | pio = mvsd_setup_data(host, data); | |
186 | if (pio) { | |
187 | xfer |= MVSD_XFER_MODE_PIO; | |
188 | /* PIO section of mvsd_irq has comments on those bits */ | |
189 | if (data->flags & MMC_DATA_WRITE) | |
190 | intr |= MVSD_NOR_TX_AVAIL; | |
191 | else if (host->pio_size > 32) | |
192 | intr |= MVSD_NOR_RX_FIFO_8W; | |
193 | else | |
194 | intr |= MVSD_NOR_RX_READY; | |
195 | } | |
196 | ||
197 | if (data->stop) { | |
198 | struct mmc_command *stop = data->stop; | |
199 | u32 cmd12reg = 0; | |
200 | ||
201 | mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff); | |
202 | mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16); | |
203 | ||
204 | if (stop->flags & MMC_RSP_BUSY) | |
205 | cmd12reg |= MVSD_AUTOCMD12_BUSY; | |
206 | if (stop->flags & MMC_RSP_OPCODE) | |
207 | cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK; | |
208 | cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode); | |
209 | mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg); | |
210 | ||
211 | xfer |= MVSD_XFER_MODE_AUTO_CMD12; | |
212 | intr |= MVSD_NOR_AUTOCMD12_DONE; | |
213 | } else { | |
214 | intr |= MVSD_NOR_XFER_DONE; | |
215 | } | |
216 | } else { | |
217 | intr |= MVSD_NOR_CMD_DONE; | |
218 | } | |
219 | ||
220 | mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff); | |
221 | mvsd_write(MVSD_ARG_HI, cmd->arg >> 16); | |
222 | ||
223 | spin_lock_irqsave(&host->lock, flags); | |
224 | ||
225 | host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN; | |
226 | host->xfer_mode |= xfer; | |
227 | mvsd_write(MVSD_XFER_MODE, host->xfer_mode); | |
228 | ||
229 | mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT); | |
230 | mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff); | |
231 | mvsd_write(MVSD_CMD, cmdreg); | |
232 | ||
233 | host->intr_en &= MVSD_NOR_CARD_INT; | |
234 | host->intr_en |= intr | MVSD_NOR_ERROR; | |
235 | mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); | |
236 | mvsd_write(MVSD_ERR_INTR_EN, 0xffff); | |
237 | ||
0ef89ec2 UH |
238 | timeout = cmd->busy_timeout ? cmd->busy_timeout : 5000; |
239 | mod_timer(&host->timer, jiffies + msecs_to_jiffies(timeout)); | |
236caa7c MS |
240 | |
241 | spin_unlock_irqrestore(&host->lock, flags); | |
242 | } | |
243 | ||
244 | static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd, | |
245 | u32 err_status) | |
246 | { | |
247 | void __iomem *iobase = host->base; | |
248 | ||
249 | if (cmd->flags & MMC_RSP_136) { | |
250 | unsigned int response[8], i; | |
251 | for (i = 0; i < 8; i++) | |
252 | response[i] = mvsd_read(MVSD_RSP(i)); | |
253 | cmd->resp[0] = ((response[0] & 0x03ff) << 22) | | |
254 | ((response[1] & 0xffff) << 6) | | |
255 | ((response[2] & 0xfc00) >> 10); | |
256 | cmd->resp[1] = ((response[2] & 0x03ff) << 22) | | |
257 | ((response[3] & 0xffff) << 6) | | |
258 | ((response[4] & 0xfc00) >> 10); | |
259 | cmd->resp[2] = ((response[4] & 0x03ff) << 22) | | |
260 | ((response[5] & 0xffff) << 6) | | |
261 | ((response[6] & 0xfc00) >> 10); | |
262 | cmd->resp[3] = ((response[6] & 0x03ff) << 22) | | |
263 | ((response[7] & 0x3fff) << 8); | |
264 | } else if (cmd->flags & MMC_RSP_PRESENT) { | |
265 | unsigned int response[3], i; | |
266 | for (i = 0; i < 3; i++) | |
267 | response[i] = mvsd_read(MVSD_RSP(i)); | |
268 | cmd->resp[0] = ((response[2] & 0x003f) << (8 - 8)) | | |
269 | ((response[1] & 0xffff) << (14 - 8)) | | |
270 | ((response[0] & 0x03ff) << (30 - 8)); | |
271 | cmd->resp[1] = ((response[0] & 0xfc00) >> 10); | |
272 | cmd->resp[2] = 0; | |
273 | cmd->resp[3] = 0; | |
274 | } | |
275 | ||
276 | if (err_status & MVSD_ERR_CMD_TIMEOUT) { | |
277 | cmd->error = -ETIMEDOUT; | |
278 | } else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT | | |
279 | MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) { | |
280 | cmd->error = -EILSEQ; | |
281 | } | |
282 | err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC | | |
283 | MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX | | |
284 | MVSD_ERR_CMD_STARTBIT); | |
285 | ||
286 | return err_status; | |
287 | } | |
288 | ||
289 | static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data, | |
290 | u32 err_status) | |
291 | { | |
292 | void __iomem *iobase = host->base; | |
293 | ||
294 | if (host->pio_ptr) { | |
295 | host->pio_ptr = NULL; | |
296 | host->pio_size = 0; | |
297 | } else { | |
298 | dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags, | |
feeef096 | 299 | mmc_get_dma_dir(data)); |
236caa7c MS |
300 | } |
301 | ||
302 | if (err_status & MVSD_ERR_DATA_TIMEOUT) | |
303 | data->error = -ETIMEDOUT; | |
304 | else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT)) | |
305 | data->error = -EILSEQ; | |
306 | else if (err_status & MVSD_ERR_XFER_SIZE) | |
307 | data->error = -EBADE; | |
308 | err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC | | |
309 | MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE); | |
310 | ||
311 | dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n", | |
312 | mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT)); | |
313 | data->bytes_xfered = | |
314 | (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz; | |
315 | /* We can't be sure about the last block when errors are detected */ | |
316 | if (data->bytes_xfered && data->error) | |
317 | data->bytes_xfered -= data->blksz; | |
318 | ||
319 | /* Handle Auto cmd 12 response */ | |
320 | if (data->stop) { | |
321 | unsigned int response[3], i; | |
322 | for (i = 0; i < 3; i++) | |
323 | response[i] = mvsd_read(MVSD_AUTO_RSP(i)); | |
324 | data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) | | |
325 | ((response[1] & 0xffff) << (14 - 8)) | | |
326 | ((response[0] & 0x03ff) << (30 - 8)); | |
327 | data->stop->resp[1] = ((response[0] & 0xfc00) >> 10); | |
328 | data->stop->resp[2] = 0; | |
329 | data->stop->resp[3] = 0; | |
330 | ||
331 | if (err_status & MVSD_ERR_AUTOCMD12) { | |
332 | u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS); | |
333 | dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12); | |
334 | if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE) | |
335 | data->stop->error = -ENOEXEC; | |
336 | else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT) | |
337 | data->stop->error = -ETIMEDOUT; | |
338 | else if (err_cmd12) | |
339 | data->stop->error = -EILSEQ; | |
340 | err_status &= ~MVSD_ERR_AUTOCMD12; | |
341 | } | |
342 | } | |
343 | ||
344 | return err_status; | |
345 | } | |
346 | ||
347 | static irqreturn_t mvsd_irq(int irq, void *dev) | |
348 | { | |
349 | struct mvsd_host *host = dev; | |
350 | void __iomem *iobase = host->base; | |
351 | u32 intr_status, intr_done_mask; | |
352 | int irq_handled = 0; | |
353 | ||
354 | intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); | |
355 | dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n", | |
356 | intr_status, mvsd_read(MVSD_NOR_INTR_EN), | |
357 | mvsd_read(MVSD_HW_STATE)); | |
358 | ||
b78871d0 SH |
359 | /* |
360 | * It looks like, SDIO IP can issue one late, spurious irq | |
361 | * although all irqs should be disabled. To work around this, | |
362 | * bail out early, if we didn't expect any irqs to occur. | |
363 | */ | |
364 | if (!mvsd_read(MVSD_NOR_INTR_EN) && !mvsd_read(MVSD_ERR_INTR_EN)) { | |
365 | dev_dbg(host->dev, "spurious irq detected intr 0x%04x intr_en 0x%04x erri 0x%04x erri_en 0x%04x\n", | |
366 | mvsd_read(MVSD_NOR_INTR_STATUS), | |
367 | mvsd_read(MVSD_NOR_INTR_EN), | |
368 | mvsd_read(MVSD_ERR_INTR_STATUS), | |
369 | mvsd_read(MVSD_ERR_INTR_EN)); | |
370 | return IRQ_HANDLED; | |
371 | } | |
372 | ||
236caa7c MS |
373 | spin_lock(&host->lock); |
374 | ||
375 | /* PIO handling, if needed. Messy business... */ | |
376 | if (host->pio_size && | |
377 | (intr_status & host->intr_en & | |
378 | (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) { | |
379 | u16 *p = host->pio_ptr; | |
380 | int s = host->pio_size; | |
381 | while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) { | |
382 | readsw(iobase + MVSD_FIFO, p, 16); | |
383 | p += 16; | |
384 | s -= 32; | |
385 | intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); | |
386 | } | |
387 | /* | |
388 | * Normally we'd use < 32 here, but the RX_FIFO_8W bit | |
389 | * doesn't appear to assert when there is exactly 32 bytes | |
390 | * (8 words) left to fetch in a transfer. | |
391 | */ | |
392 | if (s <= 32) { | |
393 | while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) { | |
394 | put_unaligned(mvsd_read(MVSD_FIFO), p++); | |
395 | put_unaligned(mvsd_read(MVSD_FIFO), p++); | |
396 | s -= 4; | |
397 | intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); | |
398 | } | |
399 | if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) { | |
400 | u16 val[2] = {0, 0}; | |
401 | val[0] = mvsd_read(MVSD_FIFO); | |
402 | val[1] = mvsd_read(MVSD_FIFO); | |
6cdbf734 | 403 | memcpy(p, ((void *)&val) + 4 - s, s); |
236caa7c MS |
404 | s = 0; |
405 | intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); | |
406 | } | |
407 | if (s == 0) { | |
408 | host->intr_en &= | |
409 | ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W); | |
410 | mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); | |
411 | } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) { | |
412 | host->intr_en &= ~MVSD_NOR_RX_FIFO_8W; | |
413 | host->intr_en |= MVSD_NOR_RX_READY; | |
414 | mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); | |
415 | } | |
416 | } | |
417 | dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n", | |
418 | s, intr_status, mvsd_read(MVSD_HW_STATE)); | |
419 | host->pio_ptr = p; | |
420 | host->pio_size = s; | |
421 | irq_handled = 1; | |
422 | } else if (host->pio_size && | |
423 | (intr_status & host->intr_en & | |
424 | (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) { | |
425 | u16 *p = host->pio_ptr; | |
426 | int s = host->pio_size; | |
427 | /* | |
428 | * The TX_FIFO_8W bit is unreliable. When set, bursting | |
429 | * 16 halfwords all at once in the FIFO drops data. Actually | |
430 | * TX_AVAIL does go off after only one word is pushed even if | |
431 | * TX_FIFO_8W remains set. | |
432 | */ | |
433 | while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) { | |
434 | mvsd_write(MVSD_FIFO, get_unaligned(p++)); | |
435 | mvsd_write(MVSD_FIFO, get_unaligned(p++)); | |
436 | s -= 4; | |
437 | intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); | |
438 | } | |
439 | if (s < 4) { | |
440 | if (s && (intr_status & MVSD_NOR_TX_AVAIL)) { | |
441 | u16 val[2] = {0, 0}; | |
6cdbf734 | 442 | memcpy(((void *)&val) + 4 - s, p, s); |
236caa7c MS |
443 | mvsd_write(MVSD_FIFO, val[0]); |
444 | mvsd_write(MVSD_FIFO, val[1]); | |
445 | s = 0; | |
446 | intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); | |
447 | } | |
448 | if (s == 0) { | |
449 | host->intr_en &= | |
450 | ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W); | |
451 | mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); | |
452 | } | |
453 | } | |
454 | dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n", | |
455 | s, intr_status, mvsd_read(MVSD_HW_STATE)); | |
456 | host->pio_ptr = p; | |
457 | host->pio_size = s; | |
458 | irq_handled = 1; | |
459 | } | |
460 | ||
461 | mvsd_write(MVSD_NOR_INTR_STATUS, intr_status); | |
462 | ||
463 | intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY | | |
464 | MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W; | |
465 | if (intr_status & host->intr_en & ~intr_done_mask) { | |
466 | struct mmc_request *mrq = host->mrq; | |
467 | struct mmc_command *cmd = mrq->cmd; | |
468 | u32 err_status = 0; | |
469 | ||
470 | del_timer(&host->timer); | |
471 | host->mrq = NULL; | |
472 | ||
473 | host->intr_en &= MVSD_NOR_CARD_INT; | |
474 | mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); | |
475 | mvsd_write(MVSD_ERR_INTR_EN, 0); | |
476 | ||
477 | spin_unlock(&host->lock); | |
478 | ||
479 | if (intr_status & MVSD_NOR_UNEXP_RSP) { | |
480 | cmd->error = -EPROTO; | |
481 | } else if (intr_status & MVSD_NOR_ERROR) { | |
482 | err_status = mvsd_read(MVSD_ERR_INTR_STATUS); | |
483 | dev_dbg(host->dev, "err 0x%04x\n", err_status); | |
484 | } | |
485 | ||
486 | err_status = mvsd_finish_cmd(host, cmd, err_status); | |
487 | if (mrq->data) | |
488 | err_status = mvsd_finish_data(host, mrq->data, err_status); | |
489 | if (err_status) { | |
e573d698 TP |
490 | dev_err(host->dev, "unhandled error status %#04x\n", |
491 | err_status); | |
236caa7c MS |
492 | cmd->error = -ENOMSG; |
493 | } | |
494 | ||
495 | mmc_request_done(host->mmc, mrq); | |
496 | irq_handled = 1; | |
497 | } else | |
498 | spin_unlock(&host->lock); | |
499 | ||
500 | if (intr_status & MVSD_NOR_CARD_INT) { | |
501 | mmc_signal_sdio_irq(host->mmc); | |
502 | irq_handled = 1; | |
503 | } | |
504 | ||
505 | if (irq_handled) | |
506 | return IRQ_HANDLED; | |
507 | ||
e573d698 TP |
508 | dev_err(host->dev, "unhandled interrupt status=0x%04x en=0x%04x pio=%d\n", |
509 | intr_status, host->intr_en, host->pio_size); | |
236caa7c MS |
510 | return IRQ_NONE; |
511 | } | |
512 | ||
2ee4f620 | 513 | static void mvsd_timeout_timer(struct timer_list *t) |
236caa7c | 514 | { |
2ee4f620 | 515 | struct mvsd_host *host = from_timer(host, t, timer); |
236caa7c MS |
516 | void __iomem *iobase = host->base; |
517 | struct mmc_request *mrq; | |
518 | unsigned long flags; | |
519 | ||
520 | spin_lock_irqsave(&host->lock, flags); | |
521 | mrq = host->mrq; | |
522 | if (mrq) { | |
e573d698 TP |
523 | dev_err(host->dev, "Timeout waiting for hardware interrupt.\n"); |
524 | dev_err(host->dev, "hw_state=0x%04x, intr_status=0x%04x intr_en=0x%04x\n", | |
525 | mvsd_read(MVSD_HW_STATE), | |
526 | mvsd_read(MVSD_NOR_INTR_STATUS), | |
527 | mvsd_read(MVSD_NOR_INTR_EN)); | |
236caa7c MS |
528 | |
529 | host->mrq = NULL; | |
530 | ||
531 | mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW); | |
532 | ||
533 | host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN; | |
534 | mvsd_write(MVSD_XFER_MODE, host->xfer_mode); | |
535 | ||
536 | host->intr_en &= MVSD_NOR_CARD_INT; | |
537 | mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); | |
538 | mvsd_write(MVSD_ERR_INTR_EN, 0); | |
539 | mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff); | |
540 | ||
541 | mrq->cmd->error = -ETIMEDOUT; | |
542 | mvsd_finish_cmd(host, mrq->cmd, 0); | |
543 | if (mrq->data) { | |
544 | mrq->data->error = -ETIMEDOUT; | |
545 | mvsd_finish_data(host, mrq->data, 0); | |
546 | } | |
547 | } | |
548 | spin_unlock_irqrestore(&host->lock, flags); | |
549 | ||
550 | if (mrq) | |
551 | mmc_request_done(host->mmc, mrq); | |
552 | } | |
553 | ||
236caa7c MS |
554 | static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable) |
555 | { | |
556 | struct mvsd_host *host = mmc_priv(mmc); | |
557 | void __iomem *iobase = host->base; | |
558 | unsigned long flags; | |
559 | ||
560 | spin_lock_irqsave(&host->lock, flags); | |
561 | if (enable) { | |
562 | host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN; | |
563 | host->intr_en |= MVSD_NOR_CARD_INT; | |
564 | } else { | |
565 | host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN; | |
566 | host->intr_en &= ~MVSD_NOR_CARD_INT; | |
567 | } | |
568 | mvsd_write(MVSD_XFER_MODE, host->xfer_mode); | |
569 | mvsd_write(MVSD_NOR_INTR_EN, host->intr_en); | |
570 | spin_unlock_irqrestore(&host->lock, flags); | |
571 | } | |
572 | ||
236caa7c MS |
573 | static void mvsd_power_up(struct mvsd_host *host) |
574 | { | |
575 | void __iomem *iobase = host->base; | |
576 | dev_dbg(host->dev, "power up\n"); | |
577 | mvsd_write(MVSD_NOR_INTR_EN, 0); | |
578 | mvsd_write(MVSD_ERR_INTR_EN, 0); | |
579 | mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW); | |
580 | mvsd_write(MVSD_XFER_MODE, 0); | |
581 | mvsd_write(MVSD_NOR_STATUS_EN, 0xffff); | |
582 | mvsd_write(MVSD_ERR_STATUS_EN, 0xffff); | |
583 | mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff); | |
584 | mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff); | |
585 | } | |
586 | ||
587 | static void mvsd_power_down(struct mvsd_host *host) | |
588 | { | |
589 | void __iomem *iobase = host->base; | |
590 | dev_dbg(host->dev, "power down\n"); | |
591 | mvsd_write(MVSD_NOR_INTR_EN, 0); | |
592 | mvsd_write(MVSD_ERR_INTR_EN, 0); | |
593 | mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW); | |
594 | mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK); | |
595 | mvsd_write(MVSD_NOR_STATUS_EN, 0); | |
596 | mvsd_write(MVSD_ERR_STATUS_EN, 0); | |
597 | mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff); | |
598 | mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff); | |
599 | } | |
600 | ||
601 | static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) | |
602 | { | |
603 | struct mvsd_host *host = mmc_priv(mmc); | |
604 | void __iomem *iobase = host->base; | |
605 | u32 ctrl_reg = 0; | |
606 | ||
607 | if (ios->power_mode == MMC_POWER_UP) | |
608 | mvsd_power_up(host); | |
609 | ||
610 | if (ios->clock == 0) { | |
611 | mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK); | |
612 | mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX); | |
613 | host->clock = 0; | |
614 | dev_dbg(host->dev, "clock off\n"); | |
615 | } else if (ios->clock != host->clock) { | |
616 | u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1; | |
617 | if (m > MVSD_BASE_DIV_MAX) | |
618 | m = MVSD_BASE_DIV_MAX; | |
619 | mvsd_write(MVSD_CLK_DIV, m); | |
620 | host->clock = ios->clock; | |
621 | host->ns_per_clk = 1000000000 / (host->base_clock / (m+1)); | |
622 | dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n", | |
623 | ios->clock, host->base_clock / (m+1), m); | |
624 | } | |
625 | ||
626 | /* default transfer mode */ | |
627 | ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN; | |
628 | ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST; | |
629 | ||
630 | /* default to maximum timeout */ | |
631 | ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK; | |
632 | ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN; | |
633 | ||
634 | if (ios->bus_mode == MMC_BUSMODE_PUSHPULL) | |
635 | ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN; | |
636 | ||
637 | if (ios->bus_width == MMC_BUS_WIDTH_4) | |
638 | ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS; | |
639 | ||
9ca6944c NP |
640 | /* |
641 | * The HI_SPEED_EN bit is causing trouble with many (but not all) | |
642 | * high speed SD, SDHC and SDIO cards. Not enabling that bit | |
643 | * makes all cards work. So let's just ignore that bit for now | |
644 | * and revisit this issue if problems for not enabling this bit | |
645 | * are ever reported. | |
646 | */ | |
647 | #if 0 | |
236caa7c MS |
648 | if (ios->timing == MMC_TIMING_MMC_HS || |
649 | ios->timing == MMC_TIMING_SD_HS) | |
650 | ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN; | |
9ca6944c | 651 | #endif |
236caa7c MS |
652 | |
653 | host->ctrl = ctrl_reg; | |
654 | mvsd_write(MVSD_HOST_CTRL, ctrl_reg); | |
655 | dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg, | |
656 | (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ? | |
657 | "push-pull" : "open-drain", | |
658 | (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ? | |
659 | "4bit-width" : "1bit-width", | |
660 | (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ? | |
661 | "high-speed" : ""); | |
662 | ||
663 | if (ios->power_mode == MMC_POWER_OFF) | |
664 | mvsd_power_down(host); | |
665 | } | |
666 | ||
667 | static const struct mmc_host_ops mvsd_ops = { | |
668 | .request = mvsd_request, | |
3724482d | 669 | .get_ro = mmc_gpio_get_ro, |
236caa7c MS |
670 | .set_ios = mvsd_set_ios, |
671 | .enable_sdio_irq = mvsd_enable_sdio_irq, | |
672 | }; | |
673 | ||
1867adee | 674 | static void |
63a9332b AL |
675 | mv_conf_mbus_windows(struct mvsd_host *host, |
676 | const struct mbus_dram_target_info *dram) | |
236caa7c MS |
677 | { |
678 | void __iomem *iobase = host->base; | |
679 | int i; | |
680 | ||
681 | for (i = 0; i < 4; i++) { | |
682 | writel(0, iobase + MVSD_WINDOW_CTRL(i)); | |
683 | writel(0, iobase + MVSD_WINDOW_BASE(i)); | |
684 | } | |
685 | ||
686 | for (i = 0; i < dram->num_cs; i++) { | |
63a9332b | 687 | const struct mbus_dram_window *cs = dram->cs + i; |
236caa7c MS |
688 | writel(((cs->size - 1) & 0xffff0000) | |
689 | (cs->mbus_attr << 8) | | |
690 | (dram->mbus_dram_target_id << 4) | 1, | |
691 | iobase + MVSD_WINDOW_CTRL(i)); | |
692 | writel(cs->base, iobase + MVSD_WINDOW_BASE(i)); | |
693 | } | |
694 | } | |
695 | ||
1867adee | 696 | static int mvsd_probe(struct platform_device *pdev) |
236caa7c | 697 | { |
111936ff | 698 | struct device_node *np = pdev->dev.of_node; |
236caa7c MS |
699 | struct mmc_host *mmc = NULL; |
700 | struct mvsd_host *host = NULL; | |
63a9332b | 701 | const struct mbus_dram_target_info *dram; |
236caa7c MS |
702 | struct resource *r; |
703 | int ret, irq; | |
704 | ||
17da6783 LW |
705 | if (!np) { |
706 | dev_err(&pdev->dev, "no DT node\n"); | |
707 | return -ENODEV; | |
708 | } | |
236caa7c MS |
709 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
710 | irq = platform_get_irq(pdev, 0); | |
111936ff | 711 | if (!r || irq < 0) |
236caa7c MS |
712 | return -ENXIO; |
713 | ||
236caa7c MS |
714 | mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev); |
715 | if (!mmc) { | |
716 | ret = -ENOMEM; | |
717 | goto out; | |
718 | } | |
719 | ||
720 | host = mmc_priv(mmc); | |
721 | host->mmc = mmc; | |
722 | host->dev = &pdev->dev; | |
111936ff TP |
723 | |
724 | /* | |
725 | * Some non-DT platforms do not pass a clock, and the clock | |
726 | * frequency is passed through platform_data. On DT platforms, | |
727 | * a clock must always be passed, even if there is no gatable | |
728 | * clock associated to the SDIO interface (it can simply be a | |
729 | * fixed rate clock). | |
730 | */ | |
731 | host->clk = devm_clk_get(&pdev->dev, NULL); | |
17da6783 LW |
732 | if (IS_ERR(host->clk)) { |
733 | dev_err(&pdev->dev, "no clock associated\n"); | |
734 | ret = -EINVAL; | |
735 | goto out; | |
736 | } | |
737 | clk_prepare_enable(host->clk); | |
111936ff | 738 | |
2cd17224 SB |
739 | mmc->ops = &mvsd_ops; |
740 | ||
741 | mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; | |
742 | ||
743 | mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX); | |
744 | mmc->f_max = MVSD_CLOCKRATE_MAX; | |
745 | ||
746 | mmc->max_blk_size = 2048; | |
747 | mmc->max_blk_count = 65535; | |
748 | ||
749 | mmc->max_segs = 1; | |
750 | mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count; | |
751 | mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; | |
752 | ||
17da6783 LW |
753 | host->base_clock = clk_get_rate(host->clk) / 2; |
754 | ret = mmc_of_parse(mmc); | |
755 | if (ret < 0) | |
756 | goto out; | |
2cd17224 SB |
757 | if (maxfreq) |
758 | mmc->f_max = maxfreq; | |
236caa7c | 759 | |
77252da7 UH |
760 | mmc->caps |= MMC_CAP_ERASE; |
761 | ||
236caa7c MS |
762 | spin_lock_init(&host->lock); |
763 | ||
e02d2930 SK |
764 | host->base = devm_ioremap_resource(&pdev->dev, r); |
765 | if (IS_ERR(host->base)) { | |
766 | ret = PTR_ERR(host->base); | |
236caa7c MS |
767 | goto out; |
768 | } | |
769 | ||
770 | /* (Re-)program MBUS remapping windows if we are asked to. */ | |
63a9332b AL |
771 | dram = mv_mbus_dram_info(); |
772 | if (dram) | |
773 | mv_conf_mbus_windows(host, dram); | |
236caa7c MS |
774 | |
775 | mvsd_power_down(host); | |
776 | ||
f42abc72 | 777 | ret = devm_request_irq(&pdev->dev, irq, mvsd_irq, 0, DRIVER_NAME, host); |
236caa7c | 778 | if (ret) { |
e573d698 | 779 | dev_err(&pdev->dev, "cannot assign irq %d\n", irq); |
236caa7c | 780 | goto out; |
f42abc72 | 781 | } |
236caa7c | 782 | |
2ee4f620 | 783 | timer_setup(&host->timer, mvsd_timeout_timer, 0); |
236caa7c MS |
784 | platform_set_drvdata(pdev, mmc); |
785 | ret = mmc_add_host(mmc); | |
786 | if (ret) | |
787 | goto out; | |
788 | ||
07728b77 | 789 | if (!(mmc->caps & MMC_CAP_NEEDS_POLL)) |
fcf902be | 790 | dev_dbg(&pdev->dev, "using GPIO for card detection\n"); |
236caa7c | 791 | else |
fcf902be SH |
792 | dev_dbg(&pdev->dev, "lacking card detect (fall back to polling)\n"); |
793 | ||
236caa7c MS |
794 | return 0; |
795 | ||
796 | out: | |
f42abc72 AL |
797 | if (mmc) { |
798 | if (!IS_ERR(host->clk)) | |
baffab28 | 799 | clk_disable_unprepare(host->clk); |
236caa7c | 800 | mmc_free_host(mmc); |
f42abc72 | 801 | } |
236caa7c MS |
802 | |
803 | return ret; | |
804 | } | |
805 | ||
1867adee | 806 | static int mvsd_remove(struct platform_device *pdev) |
236caa7c MS |
807 | { |
808 | struct mmc_host *mmc = platform_get_drvdata(pdev); | |
809 | ||
f42abc72 | 810 | struct mvsd_host *host = mmc_priv(mmc); |
236caa7c | 811 | |
f42abc72 AL |
812 | mmc_remove_host(mmc); |
813 | del_timer_sync(&host->timer); | |
814 | mvsd_power_down(host); | |
815 | ||
816 | if (!IS_ERR(host->clk)) | |
817 | clk_disable_unprepare(host->clk); | |
818 | mmc_free_host(mmc); | |
f4f7561e | 819 | |
236caa7c MS |
820 | return 0; |
821 | } | |
822 | ||
111936ff TP |
823 | static const struct of_device_id mvsdio_dt_ids[] = { |
824 | { .compatible = "marvell,orion-sdio" }, | |
825 | { /* sentinel */ } | |
826 | }; | |
827 | MODULE_DEVICE_TABLE(of, mvsdio_dt_ids); | |
828 | ||
236caa7c | 829 | static struct platform_driver mvsd_driver = { |
1867adee JH |
830 | .probe = mvsd_probe, |
831 | .remove = mvsd_remove, | |
236caa7c MS |
832 | .driver = { |
833 | .name = DRIVER_NAME, | |
111936ff | 834 | .of_match_table = mvsdio_dt_ids, |
236caa7c MS |
835 | }, |
836 | }; | |
837 | ||
1867adee | 838 | module_platform_driver(mvsd_driver); |
236caa7c MS |
839 | |
840 | /* maximum card clock frequency (default 50MHz) */ | |
841 | module_param(maxfreq, int, 0); | |
842 | ||
843 | /* force PIO transfers all the time */ | |
844 | module_param(nodma, int, 0); | |
845 | ||
846 | MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre"); | |
847 | MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver"); | |
848 | MODULE_LICENSE("GPL"); | |
703aaced | 849 | MODULE_ALIAS("platform:mvsdio"); |