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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * DMA support use of SYS DMAC with SDHI SD/SDIO controller
4 *
5 * Copyright (C) 2016-19 Renesas Electronics Corporation
6 * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang
7 * Copyright (C) 2017 Horms Solutions, Simon Horman
8 * Copyright (C) 2010-2011 Guennadi Liakhovetski
9 */
10
11#include <linux/device.h>
12#include <linux/dma-mapping.h>
13#include <linux/dmaengine.h>
14#include <linux/mmc/host.h>
15#include <linux/mod_devicetable.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/pagemap.h>
19#include <linux/platform_data/tmio.h>
20#include <linux/platform_device.h>
21#include <linux/pm_runtime.h>
22#include <linux/scatterlist.h>
23#include <linux/sys_soc.h>
24
25#include "renesas_sdhi.h"
26#include "tmio_mmc.h"
27
28#define TMIO_MMC_MIN_DMA_LEN 8
29
30static const struct renesas_sdhi_of_data of_default_cfg = {
31 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
32};
33
34static const struct renesas_sdhi_of_data of_rz_compatible = {
35 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_32BIT_DATA_PORT |
36 TMIO_MMC_HAVE_CBSY,
37 .tmio_ocr_mask = MMC_VDD_32_33,
38 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
39 MMC_CAP_WAIT_WHILE_BUSY,
40};
41
42static const struct renesas_sdhi_of_data of_rcar_gen1_compatible = {
43 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL,
44 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
45 MMC_CAP_WAIT_WHILE_BUSY,
46 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
47};
48
49/* Definitions for sampling clocks */
50static struct renesas_sdhi_scc rcar_gen2_scc_taps[] = {
51 {
52 .clk_rate = 156000000,
53 .tap = 0x00000703,
54 },
55 {
56 .clk_rate = 0,
57 .tap = 0x00000300,
58 },
59};
60
61static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = {
62 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
63 TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
64 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
65 MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY,
66 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
67 .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES,
68 .dma_rx_offset = 0x2000,
69 .scc_offset = 0x0300,
70 .taps = rcar_gen2_scc_taps,
71 .taps_num = ARRAY_SIZE(rcar_gen2_scc_taps),
72 .max_blk_count = UINT_MAX / TMIO_MAX_BLK_SIZE,
73};
74
75static const struct of_device_id renesas_sdhi_sys_dmac_of_match[] = {
76 { .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, },
77 { .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, },
78 { .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, },
79 { .compatible = "renesas,sdhi-r7s72100", .data = &of_rz_compatible, },
80 { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
81 { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
82 { .compatible = "renesas,sdhi-r8a7743", .data = &of_rcar_gen2_compatible, },
83 { .compatible = "renesas,sdhi-r8a7745", .data = &of_rcar_gen2_compatible, },
84 { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
85 { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
86 { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
87 { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
88 { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
89 { .compatible = "renesas,rcar-gen1-sdhi", .data = &of_rcar_gen1_compatible, },
90 { .compatible = "renesas,rcar-gen2-sdhi", .data = &of_rcar_gen2_compatible, },
91 { .compatible = "renesas,sdhi-shmobile" },
92 {},
93};
94MODULE_DEVICE_TABLE(of, renesas_sdhi_sys_dmac_of_match);
95
96static void renesas_sdhi_sys_dmac_enable_dma(struct tmio_mmc_host *host,
97 bool enable)
98{
99 struct renesas_sdhi *priv = host_to_priv(host);
100
101 if (!host->chan_tx || !host->chan_rx)
102 return;
103
104 if (priv->dma_priv.enable)
105 priv->dma_priv.enable(host, enable);
106}
107
108static void renesas_sdhi_sys_dmac_abort_dma(struct tmio_mmc_host *host)
109{
110 renesas_sdhi_sys_dmac_enable_dma(host, false);
111
112 if (host->chan_rx)
113 dmaengine_terminate_sync(host->chan_rx);
114 if (host->chan_tx)
115 dmaengine_terminate_sync(host->chan_tx);
116
117 renesas_sdhi_sys_dmac_enable_dma(host, true);
118}
119
120static void renesas_sdhi_sys_dmac_dataend_dma(struct tmio_mmc_host *host)
121{
122 struct renesas_sdhi *priv = host_to_priv(host);
123
124 complete(&priv->dma_priv.dma_dataend);
125}
126
127static void renesas_sdhi_sys_dmac_dma_callback(void *arg)
128{
129 struct tmio_mmc_host *host = arg;
130 struct renesas_sdhi *priv = host_to_priv(host);
131
132 spin_lock_irq(&host->lock);
133
134 if (!host->data)
135 goto out;
136
137 if (host->data->flags & MMC_DATA_READ)
138 dma_unmap_sg(host->chan_rx->device->dev,
139 host->sg_ptr, host->sg_len,
140 DMA_FROM_DEVICE);
141 else
142 dma_unmap_sg(host->chan_tx->device->dev,
143 host->sg_ptr, host->sg_len,
144 DMA_TO_DEVICE);
145
146 spin_unlock_irq(&host->lock);
147
148 wait_for_completion(&priv->dma_priv.dma_dataend);
149
150 spin_lock_irq(&host->lock);
151 tmio_mmc_do_data_irq(host);
152out:
153 spin_unlock_irq(&host->lock);
154}
155
156static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host)
157{
158 struct renesas_sdhi *priv = host_to_priv(host);
159 struct scatterlist *sg = host->sg_ptr, *sg_tmp;
160 struct dma_async_tx_descriptor *desc = NULL;
161 struct dma_chan *chan = host->chan_rx;
162 dma_cookie_t cookie;
163 int ret, i;
164 bool aligned = true, multiple = true;
165 unsigned int align = 1; /* 2-byte alignment */
166
167 for_each_sg(sg, sg_tmp, host->sg_len, i) {
168 if (sg_tmp->offset & align)
169 aligned = false;
170 if (sg_tmp->length & align) {
171 multiple = false;
172 break;
173 }
174 }
175
176 if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
177 (align & PAGE_MASK))) || !multiple) {
178 ret = -EINVAL;
179 goto pio;
180 }
181
182 if (sg->length < TMIO_MMC_MIN_DMA_LEN)
183 return;
184
185 /* The only sg element can be unaligned, use our bounce buffer then */
186 if (!aligned) {
187 sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
188 host->sg_ptr = &host->bounce_sg;
189 sg = host->sg_ptr;
190 }
191
192 ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
193 if (ret > 0)
194 desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_DEV_TO_MEM,
195 DMA_CTRL_ACK);
196
197 if (desc) {
198 reinit_completion(&priv->dma_priv.dma_dataend);
199 desc->callback = renesas_sdhi_sys_dmac_dma_callback;
200 desc->callback_param = host;
201
202 cookie = dmaengine_submit(desc);
203 if (cookie < 0) {
204 desc = NULL;
205 ret = cookie;
206 }
207 host->dma_on = true;
208 }
209pio:
210 if (!desc) {
211 /* DMA failed, fall back to PIO */
212 renesas_sdhi_sys_dmac_enable_dma(host, false);
213 if (ret >= 0)
214 ret = -EIO;
215 host->chan_rx = NULL;
216 dma_release_channel(chan);
217 /* Free the Tx channel too */
218 chan = host->chan_tx;
219 if (chan) {
220 host->chan_tx = NULL;
221 dma_release_channel(chan);
222 }
223 dev_warn(&host->pdev->dev,
224 "DMA failed: %d, falling back to PIO\n", ret);
225 }
226}
227
228static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host)
229{
230 struct renesas_sdhi *priv = host_to_priv(host);
231 struct scatterlist *sg = host->sg_ptr, *sg_tmp;
232 struct dma_async_tx_descriptor *desc = NULL;
233 struct dma_chan *chan = host->chan_tx;
234 dma_cookie_t cookie;
235 int ret, i;
236 bool aligned = true, multiple = true;
237 unsigned int align = 1; /* 2-byte alignment */
238
239 for_each_sg(sg, sg_tmp, host->sg_len, i) {
240 if (sg_tmp->offset & align)
241 aligned = false;
242 if (sg_tmp->length & align) {
243 multiple = false;
244 break;
245 }
246 }
247
248 if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
249 (align & PAGE_MASK))) || !multiple) {
250 ret = -EINVAL;
251 goto pio;
252 }
253
254 if (sg->length < TMIO_MMC_MIN_DMA_LEN)
255 return;
256
257 /* The only sg element can be unaligned, use our bounce buffer then */
258 if (!aligned) {
259 void *sg_vaddr = kmap_local_page(sg_page(sg));
260
261 sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
262 memcpy(host->bounce_buf, sg_vaddr + sg->offset, host->bounce_sg.length);
263 kunmap_local(sg_vaddr);
264 host->sg_ptr = &host->bounce_sg;
265 sg = host->sg_ptr;
266 }
267
268 ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
269 if (ret > 0)
270 desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_MEM_TO_DEV,
271 DMA_CTRL_ACK);
272
273 if (desc) {
274 reinit_completion(&priv->dma_priv.dma_dataend);
275 desc->callback = renesas_sdhi_sys_dmac_dma_callback;
276 desc->callback_param = host;
277
278 cookie = dmaengine_submit(desc);
279 if (cookie < 0) {
280 desc = NULL;
281 ret = cookie;
282 }
283 host->dma_on = true;
284 }
285pio:
286 if (!desc) {
287 /* DMA failed, fall back to PIO */
288 renesas_sdhi_sys_dmac_enable_dma(host, false);
289 if (ret >= 0)
290 ret = -EIO;
291 host->chan_tx = NULL;
292 dma_release_channel(chan);
293 /* Free the Rx channel too */
294 chan = host->chan_rx;
295 if (chan) {
296 host->chan_rx = NULL;
297 dma_release_channel(chan);
298 }
299 dev_warn(&host->pdev->dev,
300 "DMA failed: %d, falling back to PIO\n", ret);
301 }
302}
303
304static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host,
305 struct mmc_data *data)
306{
307 if (data->flags & MMC_DATA_READ) {
308 if (host->chan_rx)
309 renesas_sdhi_sys_dmac_start_dma_rx(host);
310 } else {
311 if (host->chan_tx)
312 renesas_sdhi_sys_dmac_start_dma_tx(host);
313 }
314}
315
316static void renesas_sdhi_sys_dmac_issue_work_fn(struct work_struct *work)
317{
318 struct tmio_mmc_host *host = from_work(host, work, dma_issue);
319 struct dma_chan *chan = NULL;
320
321 spin_lock_irq(&host->lock);
322
323 if (host->data) {
324 if (host->data->flags & MMC_DATA_READ)
325 chan = host->chan_rx;
326 else
327 chan = host->chan_tx;
328 }
329
330 spin_unlock_irq(&host->lock);
331
332 tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
333
334 if (chan)
335 dma_async_issue_pending(chan);
336}
337
338static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
339 struct tmio_mmc_data *pdata)
340{
341 struct renesas_sdhi *priv = host_to_priv(host);
342
343 /* We can only either use DMA for both Tx and Rx or not use it at all */
344 if (!host->pdev->dev.of_node &&
345 (!pdata->chan_priv_tx || !pdata->chan_priv_rx))
346 return;
347
348 if (!host->chan_tx && !host->chan_rx) {
349 struct resource *res = platform_get_resource(host->pdev,
350 IORESOURCE_MEM, 0);
351 struct dma_slave_config cfg = {};
352 dma_cap_mask_t mask;
353 int ret;
354
355 if (!res)
356 return;
357
358 dma_cap_zero(mask);
359 dma_cap_set(DMA_SLAVE, mask);
360
361 host->chan_tx = dma_request_slave_channel_compat(mask,
362 priv->dma_priv.filter, pdata->chan_priv_tx,
363 &host->pdev->dev, "tx");
364 dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
365 host->chan_tx);
366
367 if (!host->chan_tx)
368 return;
369
370 cfg.direction = DMA_MEM_TO_DEV;
371 cfg.dst_addr = res->start +
372 (CTL_SD_DATA_PORT << host->bus_shift);
373 cfg.dst_addr_width = priv->dma_priv.dma_buswidth;
374 if (!cfg.dst_addr_width)
375 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
376 cfg.src_addr = 0;
377 ret = dmaengine_slave_config(host->chan_tx, &cfg);
378 if (ret < 0)
379 goto ecfgtx;
380
381 host->chan_rx = dma_request_slave_channel_compat(mask,
382 priv->dma_priv.filter, pdata->chan_priv_rx,
383 &host->pdev->dev, "rx");
384 dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
385 host->chan_rx);
386
387 if (!host->chan_rx)
388 goto ereqrx;
389
390 cfg.direction = DMA_DEV_TO_MEM;
391 cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset;
392 cfg.src_addr_width = priv->dma_priv.dma_buswidth;
393 if (!cfg.src_addr_width)
394 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
395 cfg.dst_addr = 0;
396 ret = dmaengine_slave_config(host->chan_rx, &cfg);
397 if (ret < 0)
398 goto ecfgrx;
399
400 host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA);
401 if (!host->bounce_buf)
402 goto ebouncebuf;
403
404 init_completion(&priv->dma_priv.dma_dataend);
405 INIT_WORK(&host->dma_issue,
406 renesas_sdhi_sys_dmac_issue_work_fn);
407 }
408
409 renesas_sdhi_sys_dmac_enable_dma(host, true);
410
411 return;
412
413ebouncebuf:
414ecfgrx:
415 dma_release_channel(host->chan_rx);
416 host->chan_rx = NULL;
417ereqrx:
418ecfgtx:
419 dma_release_channel(host->chan_tx);
420 host->chan_tx = NULL;
421}
422
423static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host)
424{
425 if (host->chan_tx) {
426 struct dma_chan *chan = host->chan_tx;
427
428 host->chan_tx = NULL;
429 dma_release_channel(chan);
430 }
431 if (host->chan_rx) {
432 struct dma_chan *chan = host->chan_rx;
433
434 host->chan_rx = NULL;
435 dma_release_channel(chan);
436 }
437 if (host->bounce_buf) {
438 free_pages((unsigned long)host->bounce_buf, 0);
439 host->bounce_buf = NULL;
440 }
441}
442
443static const struct tmio_mmc_dma_ops renesas_sdhi_sys_dmac_dma_ops = {
444 .start = renesas_sdhi_sys_dmac_start_dma,
445 .enable = renesas_sdhi_sys_dmac_enable_dma,
446 .request = renesas_sdhi_sys_dmac_request_dma,
447 .release = renesas_sdhi_sys_dmac_release_dma,
448 .abort = renesas_sdhi_sys_dmac_abort_dma,
449 .dataend = renesas_sdhi_sys_dmac_dataend_dma,
450};
451
452static int renesas_sdhi_sys_dmac_probe(struct platform_device *pdev)
453{
454 return renesas_sdhi_probe(pdev, &renesas_sdhi_sys_dmac_dma_ops,
455 of_device_get_match_data(&pdev->dev), NULL);
456}
457
458static const struct dev_pm_ops renesas_sdhi_sys_dmac_dev_pm_ops = {
459 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
460 pm_runtime_force_resume)
461 SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
462 tmio_mmc_host_runtime_resume,
463 NULL)
464};
465
466static struct platform_driver renesas_sys_dmac_sdhi_driver = {
467 .driver = {
468 .name = "sh_mobile_sdhi",
469 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
470 .pm = &renesas_sdhi_sys_dmac_dev_pm_ops,
471 .of_match_table = renesas_sdhi_sys_dmac_of_match,
472 },
473 .probe = renesas_sdhi_sys_dmac_probe,
474 .remove = renesas_sdhi_remove,
475};
476
477module_platform_driver(renesas_sys_dmac_sdhi_driver);
478
479MODULE_DESCRIPTION("Renesas SDHI driver");
480MODULE_AUTHOR("Magnus Damm");
481MODULE_LICENSE("GPL v2");
482MODULE_ALIAS("platform:sh_mobile_sdhi");