1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * DMA support for Internal DMAC with SDHI SD/SDIO controller
4  *
5  * Copyright (C) 2016-19 Renesas Electronics Corporation
6  * Copyright (C) 2016-17 Horms Solutions, Simon Horman
7  * Copyright (C) 2018-19 Sang Engineering, Wolfram Sang
8  */
9 
10 #include <linux/bitops.h>
11 #include <linux/device.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/io-64-nonatomic-hi-lo.h>
14 #include <linux/mfd/tmio.h>
15 #include <linux/mmc/host.h>
16 #include <linux/mod_devicetable.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/platform_device.h>
20 #include <linux/pagemap.h>
21 #include <linux/scatterlist.h>
22 #include <linux/sys_soc.h>
23 
24 #include "renesas_sdhi.h"
25 #include "tmio_mmc.h"
26 
27 #define DM_CM_DTRAN_MODE	0x820
28 #define DM_CM_DTRAN_CTRL	0x828
29 #define DM_CM_RST		0x830
30 #define DM_CM_INFO1		0x840
31 #define DM_CM_INFO1_MASK	0x848
32 #define DM_CM_INFO2		0x850
33 #define DM_CM_INFO2_MASK	0x858
34 #define DM_DTRAN_ADDR		0x880
35 
36 /* DM_CM_DTRAN_MODE */
37 #define DTRAN_MODE_CH_NUM_CH0	0	/* "downstream" = for write commands */
38 #define DTRAN_MODE_CH_NUM_CH1	BIT(16)	/* "upstream" = for read commands */
39 #define DTRAN_MODE_BUS_WIDTH	(BIT(5) | BIT(4))
40 #define DTRAN_MODE_ADDR_MODE	BIT(0)	/* 1 = Increment address, 0 = Fixed */
41 
42 /* DM_CM_DTRAN_CTRL */
43 #define DTRAN_CTRL_DM_START	BIT(0)
44 
45 /* DM_CM_RST */
46 #define RST_DTRANRST1		BIT(9)
47 #define RST_DTRANRST0		BIT(8)
48 #define RST_RESERVED_BITS	GENMASK_ULL(31, 0)
49 
50 /* DM_CM_INFO1 and DM_CM_INFO1_MASK */
51 #define INFO1_MASK_CLEAR	GENMASK_ULL(31, 0)
52 #define INFO1_DTRANEND1		BIT(20)
53 #define INFO1_DTRANEND1_OLD	BIT(17)
54 #define INFO1_DTRANEND0		BIT(16)
55 
56 /* DM_CM_INFO2 and DM_CM_INFO2_MASK */
57 #define INFO2_MASK_CLEAR	GENMASK_ULL(31, 0)
58 #define INFO2_DTRANERR1		BIT(17)
59 #define INFO2_DTRANERR0		BIT(16)
60 
61 enum renesas_sdhi_dma_cookie {
62 	COOKIE_UNMAPPED,
63 	COOKIE_PRE_MAPPED,
64 	COOKIE_MAPPED,
65 };
66 
67 /*
68  * Specification of this driver:
69  * - host->chan_{rx,tx} will be used as a flag of enabling/disabling the dma
70  * - Since this SDHI DMAC register set has 16 but 32-bit width, we
71  *   need a custom accessor.
72  */
73 
74 static unsigned long global_flags;
75 /*
76  * Workaround for avoiding to use RX DMAC by multiple channels. On R-Car M3-W
77  * ES1.0, when multiple SDHI channels use RX DMAC simultaneously, sometimes
78  * hundreds of data bytes are not stored into the system memory even if the
79  * DMAC interrupt happened. So, this driver then uses one RX DMAC channel only.
80  */
81 #define SDHI_INTERNAL_DMAC_RX_IN_USE	0
82 
83 /* Definitions for sampling clocks */
84 static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = {
85 	{
86 		.clk_rate = 0,
87 		.tap = 0x00000300,
88 		.tap_hs400_4tap = 0x00000100,
89 	},
90 };
91 
92 static const struct renesas_sdhi_of_data of_data_rza2 = {
93 	.tmio_flags	= TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
94 			  TMIO_MMC_HAVE_CBSY,
95 	.tmio_ocr_mask	= MMC_VDD_32_33,
96 	.capabilities	= MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
97 			  MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY,
98 	.bus_shift	= 2,
99 	.scc_offset	= 0 - 0x1000,
100 	.taps		= rcar_gen3_scc_taps,
101 	.taps_num	= ARRAY_SIZE(rcar_gen3_scc_taps),
102 	/* DMAC can handle 32bit blk count but only 1 segment */
103 	.max_blk_count	= UINT_MAX / TMIO_MAX_BLK_SIZE,
104 	.max_segs	= 1,
105 };
106 
107 static const struct renesas_sdhi_of_data of_data_rcar_gen3 = {
108 	.tmio_flags	= TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
109 			  TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
110 	.capabilities	= MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
111 			  MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY,
112 	.capabilities2	= MMC_CAP2_NO_WRITE_PROTECT | MMC_CAP2_MERGE_CAPABLE,
113 	.bus_shift	= 2,
114 	.scc_offset	= 0x1000,
115 	.taps		= rcar_gen3_scc_taps,
116 	.taps_num	= ARRAY_SIZE(rcar_gen3_scc_taps),
117 	/* DMAC can handle 32bit blk count but only 1 segment */
118 	.max_blk_count	= UINT_MAX / TMIO_MAX_BLK_SIZE,
119 	.max_segs	= 1,
120 	.sdhi_flags	= SDHI_FLAG_NEED_CLKH_FALLBACK,
121 };
122 
123 static const struct renesas_sdhi_of_data of_data_rcar_gen3_no_sdh_fallback = {
124 	.tmio_flags	= TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
125 			  TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
126 	.capabilities	= MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
127 			  MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY,
128 	.capabilities2	= MMC_CAP2_NO_WRITE_PROTECT | MMC_CAP2_MERGE_CAPABLE,
129 	.bus_shift	= 2,
130 	.scc_offset	= 0x1000,
131 	.taps		= rcar_gen3_scc_taps,
132 	.taps_num	= ARRAY_SIZE(rcar_gen3_scc_taps),
133 	/* DMAC can handle 32bit blk count but only 1 segment */
134 	.max_blk_count	= UINT_MAX / TMIO_MAX_BLK_SIZE,
135 	.max_segs	= 1,
136 };
137 
138 static const u8 r8a7796_es13_calib_table[2][SDHI_CALIB_TABLE_MAX] = {
139 	{ 3,  3,  3,  3,  3,  3,  3,  4,  4,  5,  6,  7,  8,  9, 10, 15,
140 	 16, 16, 16, 16, 16, 16, 17, 18, 18, 19, 20, 21, 22, 23, 24, 25 },
141 	{ 5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  6,  7,  8, 11,
142 	 12, 17, 18, 18, 18, 18, 18, 18, 18, 19, 20, 21, 22, 23, 25, 25 }
143 };
144 
145 static const u8 r8a77965_calib_table[2][SDHI_CALIB_TABLE_MAX] = {
146 	{ 1,  2,  6,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 15, 15, 16,
147 	 17, 18, 19, 20, 21, 22, 23, 24, 25, 25, 26, 27, 28, 29, 30, 31 },
148 	{ 2,  3,  4,  4,  5,  6,  7,  9, 10, 11, 12, 13, 14, 15, 16, 17,
149 	 17, 17, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 31, 31, 31 }
150 };
151 
152 static const u8 r8a77990_calib_table[2][SDHI_CALIB_TABLE_MAX] = {
153 	{ 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
154 	  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0 },
155 	{ 0,  0,  0,  1,  2,  3,  3,  4,  4,  4,  5,  5,  6,  8,  9, 10,
156 	 11, 12, 13, 15, 16, 17, 17, 18, 18, 19, 20, 22, 24, 25, 26, 26 }
157 };
158 
159 static const struct renesas_sdhi_quirks sdhi_quirks_4tap_nohs400 = {
160 	.hs400_disabled = true,
161 	.hs400_4taps = true,
162 };
163 
164 static const struct renesas_sdhi_quirks sdhi_quirks_4tap_nohs400_one_rx = {
165 	.hs400_disabled = true,
166 	.hs400_4taps = true,
167 	.dma_one_rx_only = true,
168 	.old_info1_layout = true,
169 };
170 
171 static const struct renesas_sdhi_quirks sdhi_quirks_4tap = {
172 	.hs400_4taps = true,
173 	.hs400_bad_taps = BIT(2) | BIT(3) | BIT(6) | BIT(7),
174 	.manual_tap_correction = true,
175 };
176 
177 static const struct renesas_sdhi_quirks sdhi_quirks_nohs400 = {
178 	.hs400_disabled = true,
179 };
180 
181 static const struct renesas_sdhi_quirks sdhi_quirks_fixed_addr = {
182 	.fixed_addr_mode = true,
183 };
184 
185 static const struct renesas_sdhi_quirks sdhi_quirks_bad_taps1357 = {
186 	.hs400_bad_taps = BIT(1) | BIT(3) | BIT(5) | BIT(7),
187 	.manual_tap_correction = true,
188 };
189 
190 static const struct renesas_sdhi_quirks sdhi_quirks_bad_taps2367 = {
191 	.hs400_bad_taps = BIT(2) | BIT(3) | BIT(6) | BIT(7),
192 	.manual_tap_correction = true,
193 };
194 
195 static const struct renesas_sdhi_quirks sdhi_quirks_r8a7796_es13 = {
196 	.hs400_4taps = true,
197 	.hs400_bad_taps = BIT(2) | BIT(3) | BIT(6) | BIT(7),
198 	.hs400_calib_table = r8a7796_es13_calib_table,
199 	.manual_tap_correction = true,
200 };
201 
202 static const struct renesas_sdhi_quirks sdhi_quirks_r8a77965 = {
203 	.hs400_bad_taps = BIT(2) | BIT(3) | BIT(6) | BIT(7),
204 	.hs400_calib_table = r8a77965_calib_table,
205 	.manual_tap_correction = true,
206 };
207 
208 static const struct renesas_sdhi_quirks sdhi_quirks_r8a77990 = {
209 	.hs400_calib_table = r8a77990_calib_table,
210 	.manual_tap_correction = true,
211 };
212 
213 static const struct renesas_sdhi_quirks sdhi_quirks_r9a09g011 = {
214 	.fixed_addr_mode = true,
215 	.hs400_disabled = true,
216 };
217 
218 /*
219  * Note for r8a7796 / r8a774a1: we can't distinguish ES1.1 and 1.2 as of now.
220  * So, we want to treat them equally and only have a match for ES1.2 to enforce
221  * this if there ever will be a way to distinguish ES1.2.
222  */
223 static const struct soc_device_attribute sdhi_quirks_match[]  = {
224 	{ .soc_id = "r8a774a1", .revision = "ES1.[012]", .data = &sdhi_quirks_4tap_nohs400 },
225 	{ .soc_id = "r8a7795", .revision = "ES2.0", .data = &sdhi_quirks_4tap },
226 	{ .soc_id = "r8a7796", .revision = "ES1.0", .data = &sdhi_quirks_4tap_nohs400_one_rx },
227 	{ .soc_id = "r8a7796", .revision = "ES1.[12]", .data = &sdhi_quirks_4tap_nohs400 },
228 	{ .soc_id = "r8a7796", .revision = "ES1.*", .data = &sdhi_quirks_r8a7796_es13 },
229 	{ .soc_id = "r8a77980", .revision = "ES1.*", .data = &sdhi_quirks_nohs400 },
230 	{ /* Sentinel. */ }
231 };
232 
233 static const struct renesas_sdhi_of_data_with_quirks of_r8a7795_compatible = {
234 	.of_data = &of_data_rcar_gen3,
235 	.quirks = &sdhi_quirks_bad_taps2367,
236 };
237 
238 static const struct renesas_sdhi_of_data_with_quirks of_r8a77961_compatible = {
239 	.of_data = &of_data_rcar_gen3,
240 	.quirks = &sdhi_quirks_bad_taps1357,
241 };
242 
243 static const struct renesas_sdhi_of_data_with_quirks of_r8a77965_compatible = {
244 	.of_data = &of_data_rcar_gen3,
245 	.quirks = &sdhi_quirks_r8a77965,
246 };
247 
248 static const struct renesas_sdhi_of_data_with_quirks of_r8a77970_compatible = {
249 	.of_data = &of_data_rcar_gen3_no_sdh_fallback,
250 	.quirks = &sdhi_quirks_nohs400,
251 };
252 
253 static const struct renesas_sdhi_of_data_with_quirks of_r8a77990_compatible = {
254 	.of_data = &of_data_rcar_gen3,
255 	.quirks = &sdhi_quirks_r8a77990,
256 };
257 
258 static const struct renesas_sdhi_of_data_with_quirks of_r9a09g011_compatible = {
259 	.of_data = &of_data_rcar_gen3,
260 	.quirks = &sdhi_quirks_r9a09g011,
261 };
262 
263 static const struct renesas_sdhi_of_data_with_quirks of_rcar_gen3_compatible = {
264 	.of_data = &of_data_rcar_gen3,
265 };
266 
267 static const struct renesas_sdhi_of_data_with_quirks of_rcar_gen3_nohs400_compatible = {
268 	.of_data = &of_data_rcar_gen3,
269 	.quirks = &sdhi_quirks_nohs400,
270 };
271 
272 static const struct renesas_sdhi_of_data_with_quirks of_rza2_compatible = {
273 	.of_data	= &of_data_rza2,
274 	.quirks		= &sdhi_quirks_fixed_addr,
275 };
276 
277 static const struct of_device_id renesas_sdhi_internal_dmac_of_match[] = {
278 	{ .compatible = "renesas,sdhi-r7s9210", .data = &of_rza2_compatible, },
279 	{ .compatible = "renesas,sdhi-mmc-r8a77470", .data = &of_rcar_gen3_compatible, },
280 	{ .compatible = "renesas,sdhi-r8a7795", .data = &of_r8a7795_compatible, },
281 	{ .compatible = "renesas,sdhi-r8a77961", .data = &of_r8a77961_compatible, },
282 	{ .compatible = "renesas,sdhi-r8a77965", .data = &of_r8a77965_compatible, },
283 	{ .compatible = "renesas,sdhi-r8a77970", .data = &of_r8a77970_compatible, },
284 	{ .compatible = "renesas,sdhi-r8a77990", .data = &of_r8a77990_compatible, },
285 	{ .compatible = "renesas,sdhi-r8a77995", .data = &of_rcar_gen3_nohs400_compatible, },
286 	{ .compatible = "renesas,sdhi-r9a09g011", .data = &of_r9a09g011_compatible, },
287 	{ .compatible = "renesas,rcar-gen3-sdhi", .data = &of_rcar_gen3_compatible, },
288 	{ .compatible = "renesas,rcar-gen4-sdhi", .data = &of_rcar_gen3_compatible, },
289 	{},
290 };
291 MODULE_DEVICE_TABLE(of, renesas_sdhi_internal_dmac_of_match);
292 
293 static void
renesas_sdhi_internal_dmac_enable_dma(struct tmio_mmc_host * host,bool enable)294 renesas_sdhi_internal_dmac_enable_dma(struct tmio_mmc_host *host, bool enable)
295 {
296 	struct renesas_sdhi *priv = host_to_priv(host);
297 	u32 dma_irqs = INFO1_DTRANEND0 |
298 			(sdhi_has_quirk(priv, old_info1_layout) ?
299 			INFO1_DTRANEND1_OLD : INFO1_DTRANEND1);
300 
301 	if (!host->chan_tx || !host->chan_rx)
302 		return;
303 
304 	writel(enable ? ~dma_irqs : INFO1_MASK_CLEAR, host->ctl + DM_CM_INFO1_MASK);
305 
306 	if (priv->dma_priv.enable)
307 		priv->dma_priv.enable(host, enable);
308 }
309 
310 static void
renesas_sdhi_internal_dmac_abort_dma(struct tmio_mmc_host * host)311 renesas_sdhi_internal_dmac_abort_dma(struct tmio_mmc_host *host)
312 {
313 	u64 val = RST_DTRANRST1 | RST_DTRANRST0;
314 
315 	renesas_sdhi_internal_dmac_enable_dma(host, false);
316 
317 	writel(RST_RESERVED_BITS & ~val, host->ctl + DM_CM_RST);
318 	writel(RST_RESERVED_BITS | val, host->ctl + DM_CM_RST);
319 
320 	clear_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags);
321 
322 	renesas_sdhi_internal_dmac_enable_dma(host, true);
323 }
324 
renesas_sdhi_internal_dmac_dma_irq(struct tmio_mmc_host * host)325 static bool renesas_sdhi_internal_dmac_dma_irq(struct tmio_mmc_host *host)
326 {
327 	struct renesas_sdhi *priv = host_to_priv(host);
328 	struct renesas_sdhi_dma *dma_priv = &priv->dma_priv;
329 
330 	u32 dma_irqs = INFO1_DTRANEND0 |
331 			(sdhi_has_quirk(priv, old_info1_layout) ?
332 			INFO1_DTRANEND1_OLD : INFO1_DTRANEND1);
333 	u32 status = readl(host->ctl + DM_CM_INFO1);
334 
335 	if (status & dma_irqs) {
336 		writel(status ^ dma_irqs, host->ctl + DM_CM_INFO1);
337 		set_bit(SDHI_DMA_END_FLAG_DMA, &dma_priv->end_flags);
338 		if (test_bit(SDHI_DMA_END_FLAG_ACCESS, &dma_priv->end_flags))
339 			tasklet_schedule(&dma_priv->dma_complete);
340 	}
341 
342 	return status & dma_irqs;
343 }
344 
345 static void
renesas_sdhi_internal_dmac_dataend_dma(struct tmio_mmc_host * host)346 renesas_sdhi_internal_dmac_dataend_dma(struct tmio_mmc_host *host)
347 {
348 	struct renesas_sdhi *priv = host_to_priv(host);
349 	struct renesas_sdhi_dma *dma_priv = &priv->dma_priv;
350 
351 	set_bit(SDHI_DMA_END_FLAG_ACCESS, &dma_priv->end_flags);
352 	if (test_bit(SDHI_DMA_END_FLAG_DMA, &dma_priv->end_flags) ||
353 	    host->data->error)
354 		tasklet_schedule(&dma_priv->dma_complete);
355 }
356 
357 /*
358  * renesas_sdhi_internal_dmac_map() will be called with two different
359  * sg pointers in two mmc_data by .pre_req(), but tmio host can have a single
360  * sg_ptr only. So, renesas_sdhi_internal_dmac_{un}map() should use a sg
361  * pointer in a mmc_data instead of host->sg_ptr.
362  */
363 static void
renesas_sdhi_internal_dmac_unmap(struct tmio_mmc_host * host,struct mmc_data * data,enum renesas_sdhi_dma_cookie cookie)364 renesas_sdhi_internal_dmac_unmap(struct tmio_mmc_host *host,
365 				 struct mmc_data *data,
366 				 enum renesas_sdhi_dma_cookie cookie)
367 {
368 	bool unmap = cookie == COOKIE_UNMAPPED ? (data->host_cookie != cookie) :
369 						 (data->host_cookie == cookie);
370 
371 	if (unmap) {
372 		dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len,
373 			     mmc_get_dma_dir(data));
374 		data->host_cookie = COOKIE_UNMAPPED;
375 	}
376 }
377 
378 static bool
renesas_sdhi_internal_dmac_map(struct tmio_mmc_host * host,struct mmc_data * data,enum renesas_sdhi_dma_cookie cookie)379 renesas_sdhi_internal_dmac_map(struct tmio_mmc_host *host,
380 			       struct mmc_data *data,
381 			       enum renesas_sdhi_dma_cookie cookie)
382 {
383 	if (data->host_cookie == COOKIE_PRE_MAPPED)
384 		return true;
385 
386 	if (!dma_map_sg(&host->pdev->dev, data->sg, data->sg_len,
387 			    mmc_get_dma_dir(data)))
388 		return false;
389 
390 	data->host_cookie = cookie;
391 
392 	/* This DMAC needs buffers to be 128-byte aligned */
393 	if (!IS_ALIGNED(sg_dma_address(data->sg), 128)) {
394 		renesas_sdhi_internal_dmac_unmap(host, data, cookie);
395 		return false;
396 	}
397 
398 	return true;
399 }
400 
401 static void
renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host * host,struct mmc_data * data)402 renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host,
403 				     struct mmc_data *data)
404 {
405 	struct renesas_sdhi *priv = host_to_priv(host);
406 	struct scatterlist *sg = host->sg_ptr;
407 	u32 dtran_mode = DTRAN_MODE_BUS_WIDTH;
408 
409 	if (!sdhi_has_quirk(priv, fixed_addr_mode))
410 		dtran_mode |= DTRAN_MODE_ADDR_MODE;
411 
412 	if (!renesas_sdhi_internal_dmac_map(host, data, COOKIE_MAPPED))
413 		goto force_pio;
414 
415 	if (data->flags & MMC_DATA_READ) {
416 		dtran_mode |= DTRAN_MODE_CH_NUM_CH1;
417 		if (sdhi_has_quirk(priv, dma_one_rx_only) &&
418 		    test_and_set_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags))
419 			goto force_pio_with_unmap;
420 	} else {
421 		dtran_mode |= DTRAN_MODE_CH_NUM_CH0;
422 	}
423 
424 	priv->dma_priv.end_flags = 0;
425 	renesas_sdhi_internal_dmac_enable_dma(host, true);
426 
427 	/* set dma parameters */
428 	writel(dtran_mode, host->ctl + DM_CM_DTRAN_MODE);
429 	writel(sg_dma_address(sg), host->ctl + DM_DTRAN_ADDR);
430 
431 	host->dma_on = true;
432 
433 	return;
434 
435 force_pio_with_unmap:
436 	renesas_sdhi_internal_dmac_unmap(host, data, COOKIE_UNMAPPED);
437 
438 force_pio:
439 	renesas_sdhi_internal_dmac_enable_dma(host, false);
440 }
441 
renesas_sdhi_internal_dmac_issue_tasklet_fn(unsigned long arg)442 static void renesas_sdhi_internal_dmac_issue_tasklet_fn(unsigned long arg)
443 {
444 	struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
445 	struct renesas_sdhi *priv = host_to_priv(host);
446 
447 	tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
448 
449 	if (!host->cmd->error) {
450 		/* start the DMAC */
451 		writel(DTRAN_CTRL_DM_START, host->ctl + DM_CM_DTRAN_CTRL);
452 	} else {
453 		/* on CMD errors, simulate DMA end immediately */
454 		set_bit(SDHI_DMA_END_FLAG_DMA, &priv->dma_priv.end_flags);
455 		if (test_bit(SDHI_DMA_END_FLAG_ACCESS, &priv->dma_priv.end_flags))
456 			tasklet_schedule(&priv->dma_priv.dma_complete);
457 	}
458 }
459 
renesas_sdhi_internal_dmac_complete(struct tmio_mmc_host * host)460 static bool renesas_sdhi_internal_dmac_complete(struct tmio_mmc_host *host)
461 {
462 	enum dma_data_direction dir;
463 
464 	if (!host->dma_on)
465 		return false;
466 
467 	if (!host->data)
468 		return false;
469 
470 	if (host->data->flags & MMC_DATA_READ)
471 		dir = DMA_FROM_DEVICE;
472 	else
473 		dir = DMA_TO_DEVICE;
474 
475 	renesas_sdhi_internal_dmac_enable_dma(host, false);
476 	renesas_sdhi_internal_dmac_unmap(host, host->data, COOKIE_MAPPED);
477 
478 	if (dir == DMA_FROM_DEVICE)
479 		clear_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags);
480 
481 	host->dma_on = false;
482 
483 	return true;
484 }
485 
renesas_sdhi_internal_dmac_complete_tasklet_fn(unsigned long arg)486 static void renesas_sdhi_internal_dmac_complete_tasklet_fn(unsigned long arg)
487 {
488 	struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
489 
490 	spin_lock_irq(&host->lock);
491 	if (!renesas_sdhi_internal_dmac_complete(host))
492 		goto out;
493 
494 	tmio_mmc_do_data_irq(host);
495 out:
496 	spin_unlock_irq(&host->lock);
497 }
498 
renesas_sdhi_internal_dmac_end_dma(struct tmio_mmc_host * host)499 static void renesas_sdhi_internal_dmac_end_dma(struct tmio_mmc_host *host)
500 {
501 	if (host->data)
502 		renesas_sdhi_internal_dmac_complete(host);
503 }
504 
renesas_sdhi_internal_dmac_post_req(struct mmc_host * mmc,struct mmc_request * mrq,int err)505 static void renesas_sdhi_internal_dmac_post_req(struct mmc_host *mmc,
506 						struct mmc_request *mrq,
507 						int err)
508 {
509 	struct tmio_mmc_host *host = mmc_priv(mmc);
510 	struct mmc_data *data = mrq->data;
511 
512 	if (!data)
513 		return;
514 
515 	renesas_sdhi_internal_dmac_unmap(host, data, COOKIE_UNMAPPED);
516 }
517 
renesas_sdhi_internal_dmac_pre_req(struct mmc_host * mmc,struct mmc_request * mrq)518 static void renesas_sdhi_internal_dmac_pre_req(struct mmc_host *mmc,
519 					       struct mmc_request *mrq)
520 {
521 	struct tmio_mmc_host *host = mmc_priv(mmc);
522 	struct mmc_data *data = mrq->data;
523 
524 	if (!data)
525 		return;
526 
527 	data->host_cookie = COOKIE_UNMAPPED;
528 	renesas_sdhi_internal_dmac_map(host, data, COOKIE_PRE_MAPPED);
529 }
530 
531 static void
renesas_sdhi_internal_dmac_request_dma(struct tmio_mmc_host * host,struct tmio_mmc_data * pdata)532 renesas_sdhi_internal_dmac_request_dma(struct tmio_mmc_host *host,
533 				       struct tmio_mmc_data *pdata)
534 {
535 	struct renesas_sdhi *priv = host_to_priv(host);
536 
537 	/* Disable DMAC interrupts initially */
538 	writel(INFO1_MASK_CLEAR, host->ctl + DM_CM_INFO1_MASK);
539 	writel(INFO2_MASK_CLEAR, host->ctl + DM_CM_INFO2_MASK);
540 	writel(0, host->ctl + DM_CM_INFO1);
541 	writel(0, host->ctl + DM_CM_INFO2);
542 
543 	/* Each value is set to non-zero to assume "enabling" each DMA */
544 	host->chan_rx = host->chan_tx = (void *)0xdeadbeaf;
545 
546 	tasklet_init(&priv->dma_priv.dma_complete,
547 		     renesas_sdhi_internal_dmac_complete_tasklet_fn,
548 		     (unsigned long)host);
549 	tasklet_init(&host->dma_issue,
550 		     renesas_sdhi_internal_dmac_issue_tasklet_fn,
551 		     (unsigned long)host);
552 
553 	/* Add pre_req and post_req */
554 	host->ops.pre_req = renesas_sdhi_internal_dmac_pre_req;
555 	host->ops.post_req = renesas_sdhi_internal_dmac_post_req;
556 }
557 
558 static void
renesas_sdhi_internal_dmac_release_dma(struct tmio_mmc_host * host)559 renesas_sdhi_internal_dmac_release_dma(struct tmio_mmc_host *host)
560 {
561 	/* Each value is set to zero to assume "disabling" each DMA */
562 	host->chan_rx = host->chan_tx = NULL;
563 }
564 
565 static const struct tmio_mmc_dma_ops renesas_sdhi_internal_dmac_dma_ops = {
566 	.start = renesas_sdhi_internal_dmac_start_dma,
567 	.enable = renesas_sdhi_internal_dmac_enable_dma,
568 	.request = renesas_sdhi_internal_dmac_request_dma,
569 	.release = renesas_sdhi_internal_dmac_release_dma,
570 	.abort = renesas_sdhi_internal_dmac_abort_dma,
571 	.dataend = renesas_sdhi_internal_dmac_dataend_dma,
572 	.end = renesas_sdhi_internal_dmac_end_dma,
573 	.dma_irq = renesas_sdhi_internal_dmac_dma_irq,
574 };
575 
renesas_sdhi_internal_dmac_probe(struct platform_device * pdev)576 static int renesas_sdhi_internal_dmac_probe(struct platform_device *pdev)
577 {
578 	const struct soc_device_attribute *attr;
579 	const struct renesas_sdhi_of_data_with_quirks *of_data_quirks;
580 	const struct renesas_sdhi_quirks *quirks;
581 	struct device *dev = &pdev->dev;
582 
583 	of_data_quirks = of_device_get_match_data(&pdev->dev);
584 	quirks = of_data_quirks->quirks;
585 
586 	attr = soc_device_match(sdhi_quirks_match);
587 	if (attr)
588 		quirks = attr->data;
589 
590 	/* value is max of SD_SECCNT. Confirmed by HW engineers */
591 	dma_set_max_seg_size(dev, 0xffffffff);
592 
593 	return renesas_sdhi_probe(pdev, &renesas_sdhi_internal_dmac_dma_ops,
594 				  of_data_quirks->of_data, quirks);
595 }
596 
597 static const struct dev_pm_ops renesas_sdhi_internal_dmac_dev_pm_ops = {
598 	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
599 				pm_runtime_force_resume)
600 	SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
601 			   tmio_mmc_host_runtime_resume,
602 			   NULL)
603 };
604 
605 static struct platform_driver renesas_internal_dmac_sdhi_driver = {
606 	.driver		= {
607 		.name	= "renesas_sdhi_internal_dmac",
608 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
609 		.pm	= &renesas_sdhi_internal_dmac_dev_pm_ops,
610 		.of_match_table = renesas_sdhi_internal_dmac_of_match,
611 	},
612 	.probe		= renesas_sdhi_internal_dmac_probe,
613 	.remove_new	= renesas_sdhi_remove,
614 };
615 
616 module_platform_driver(renesas_internal_dmac_sdhi_driver);
617 
618 MODULE_DESCRIPTION("Renesas SDHI driver for internal DMAC");
619 MODULE_AUTHOR("Yoshihiro Shimoda");
620 MODULE_LICENSE("GPL v2");
621