2 * DMA support use of SYS DMAC with SDHI SD/SDIO controller
4 * Copyright (C) 2016-17 Renesas Electronics Corporation
5 * Copyright (C) 2016-17 Sang Engineering, Wolfram Sang
6 * Copyright (C) 2017 Horms Solutions, Simon Horman
7 * Copyright (C) 2010-2011 Guennadi Liakhovetski
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/device.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/dmaengine.h>
17 #include <linux/mfd/tmio.h>
18 #include <linux/mmc/host.h>
19 #include <linux/mod_devicetable.h>
20 #include <linux/module.h>
21 #include <linux/of_device.h>
22 #include <linux/pagemap.h>
23 #include <linux/scatterlist.h>
24 #include <linux/sys_soc.h>
26 #include "renesas_sdhi.h"
29 #define TMIO_MMC_MIN_DMA_LEN 8
31 static const struct renesas_sdhi_of_data of_default_cfg = {
32 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
35 static const struct renesas_sdhi_of_data of_rz_compatible = {
36 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_32BIT_DATA_PORT |
38 .tmio_ocr_mask = MMC_VDD_32_33,
39 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
42 static const struct renesas_sdhi_of_data of_rcar_gen1_compatible = {
43 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
45 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
48 /* Definitions for sampling clocks */
49 static struct renesas_sdhi_scc rcar_gen2_scc_taps[] = {
51 .clk_rate = 156000000,
60 static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = {
61 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
62 TMIO_MMC_CLK_ACTUAL | TMIO_MMC_HAVE_CBSY |
64 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
66 .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES,
67 .dma_rx_offset = 0x2000,
69 .taps = rcar_gen2_scc_taps,
70 .taps_num = ARRAY_SIZE(rcar_gen2_scc_taps),
71 .max_blk_count = 0xffffffff,
74 /* Definitions for sampling clocks */
75 static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = {
82 static const struct renesas_sdhi_of_data of_rcar_gen3_compatible = {
83 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
84 TMIO_MMC_CLK_ACTUAL | TMIO_MMC_HAVE_CBSY |
86 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
90 .taps = rcar_gen3_scc_taps,
91 .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps),
94 static const struct of_device_id renesas_sdhi_sys_dmac_of_match[] = {
95 { .compatible = "renesas,sdhi-shmobile" },
96 { .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, },
97 { .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, },
98 { .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, },
99 { .compatible = "renesas,sdhi-r7s72100", .data = &of_rz_compatible, },
100 { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
101 { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
102 { .compatible = "renesas,sdhi-r8a7743", .data = &of_rcar_gen2_compatible, },
103 { .compatible = "renesas,sdhi-r8a7745", .data = &of_rcar_gen2_compatible, },
104 { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
105 { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
106 { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
107 { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
108 { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
109 { .compatible = "renesas,sdhi-r8a7795", .data = &of_rcar_gen3_compatible, },
110 { .compatible = "renesas,sdhi-r8a7796", .data = &of_rcar_gen3_compatible, },
113 MODULE_DEVICE_TABLE(of, renesas_sdhi_sys_dmac_of_match);
115 static void renesas_sdhi_sys_dmac_enable_dma(struct tmio_mmc_host *host,
118 if (!host->chan_tx || !host->chan_rx)
121 if (host->dma->enable)
122 host->dma->enable(host, enable);
125 static void renesas_sdhi_sys_dmac_abort_dma(struct tmio_mmc_host *host)
127 renesas_sdhi_sys_dmac_enable_dma(host, false);
130 dmaengine_terminate_all(host->chan_rx);
132 dmaengine_terminate_all(host->chan_tx);
134 renesas_sdhi_sys_dmac_enable_dma(host, true);
137 static void renesas_sdhi_sys_dmac_dataend_dma(struct tmio_mmc_host *host)
139 complete(&host->dma_dataend);
142 static void renesas_sdhi_sys_dmac_dma_callback(void *arg)
144 struct tmio_mmc_host *host = arg;
146 spin_lock_irq(&host->lock);
151 if (host->data->flags & MMC_DATA_READ)
152 dma_unmap_sg(host->chan_rx->device->dev,
153 host->sg_ptr, host->sg_len,
156 dma_unmap_sg(host->chan_tx->device->dev,
157 host->sg_ptr, host->sg_len,
160 spin_unlock_irq(&host->lock);
162 wait_for_completion(&host->dma_dataend);
164 spin_lock_irq(&host->lock);
165 tmio_mmc_do_data_irq(host);
167 spin_unlock_irq(&host->lock);
170 static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host)
172 struct scatterlist *sg = host->sg_ptr, *sg_tmp;
173 struct dma_async_tx_descriptor *desc = NULL;
174 struct dma_chan *chan = host->chan_rx;
177 bool aligned = true, multiple = true;
178 unsigned int align = (1 << host->pdata->alignment_shift) - 1;
180 for_each_sg(sg, sg_tmp, host->sg_len, i) {
181 if (sg_tmp->offset & align)
183 if (sg_tmp->length & align) {
189 if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
190 (align & PAGE_MASK))) || !multiple) {
195 if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
196 host->force_pio = true;
200 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_RXRDY);
202 /* The only sg element can be unaligned, use our bounce buffer then */
204 sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
205 host->sg_ptr = &host->bounce_sg;
209 ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
211 desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_DEV_TO_MEM,
215 reinit_completion(&host->dma_dataend);
216 desc->callback = renesas_sdhi_sys_dmac_dma_callback;
217 desc->callback_param = host;
219 cookie = dmaengine_submit(desc);
227 /* DMA failed, fall back to PIO */
228 renesas_sdhi_sys_dmac_enable_dma(host, false);
231 host->chan_rx = NULL;
232 dma_release_channel(chan);
233 /* Free the Tx channel too */
234 chan = host->chan_tx;
236 host->chan_tx = NULL;
237 dma_release_channel(chan);
239 dev_warn(&host->pdev->dev,
240 "DMA failed: %d, falling back to PIO\n", ret);
244 static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host)
246 struct scatterlist *sg = host->sg_ptr, *sg_tmp;
247 struct dma_async_tx_descriptor *desc = NULL;
248 struct dma_chan *chan = host->chan_tx;
251 bool aligned = true, multiple = true;
252 unsigned int align = (1 << host->pdata->alignment_shift) - 1;
254 for_each_sg(sg, sg_tmp, host->sg_len, i) {
255 if (sg_tmp->offset & align)
257 if (sg_tmp->length & align) {
263 if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
264 (align & PAGE_MASK))) || !multiple) {
269 if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
270 host->force_pio = true;
274 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_TXRQ);
276 /* The only sg element can be unaligned, use our bounce buffer then */
279 void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags);
281 sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
282 memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length);
283 tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr);
284 host->sg_ptr = &host->bounce_sg;
288 ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
290 desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_MEM_TO_DEV,
294 reinit_completion(&host->dma_dataend);
295 desc->callback = renesas_sdhi_sys_dmac_dma_callback;
296 desc->callback_param = host;
298 cookie = dmaengine_submit(desc);
306 /* DMA failed, fall back to PIO */
307 renesas_sdhi_sys_dmac_enable_dma(host, false);
310 host->chan_tx = NULL;
311 dma_release_channel(chan);
312 /* Free the Rx channel too */
313 chan = host->chan_rx;
315 host->chan_rx = NULL;
316 dma_release_channel(chan);
318 dev_warn(&host->pdev->dev,
319 "DMA failed: %d, falling back to PIO\n", ret);
323 static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host,
324 struct mmc_data *data)
326 if (data->flags & MMC_DATA_READ) {
328 renesas_sdhi_sys_dmac_start_dma_rx(host);
331 renesas_sdhi_sys_dmac_start_dma_tx(host);
335 static void renesas_sdhi_sys_dmac_issue_tasklet_fn(unsigned long priv)
337 struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
338 struct dma_chan *chan = NULL;
340 spin_lock_irq(&host->lock);
342 if (host && host->data) {
343 if (host->data->flags & MMC_DATA_READ)
344 chan = host->chan_rx;
346 chan = host->chan_tx;
349 spin_unlock_irq(&host->lock);
351 tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
354 dma_async_issue_pending(chan);
357 static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
358 struct tmio_mmc_data *pdata)
360 /* We can only either use DMA for both Tx and Rx or not use it at all */
361 if (!host->dma || (!host->pdev->dev.of_node &&
362 (!pdata->chan_priv_tx || !pdata->chan_priv_rx)))
365 if (!host->chan_tx && !host->chan_rx) {
366 struct resource *res = platform_get_resource(host->pdev,
368 struct dma_slave_config cfg = {};
376 dma_cap_set(DMA_SLAVE, mask);
378 host->chan_tx = dma_request_slave_channel_compat(mask,
379 host->dma->filter, pdata->chan_priv_tx,
380 &host->pdev->dev, "tx");
381 dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
387 cfg.direction = DMA_MEM_TO_DEV;
388 cfg.dst_addr = res->start +
389 (CTL_SD_DATA_PORT << host->bus_shift);
390 cfg.dst_addr_width = host->dma->dma_buswidth;
391 if (!cfg.dst_addr_width)
392 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
394 ret = dmaengine_slave_config(host->chan_tx, &cfg);
398 host->chan_rx = dma_request_slave_channel_compat(mask,
399 host->dma->filter, pdata->chan_priv_rx,
400 &host->pdev->dev, "rx");
401 dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
407 cfg.direction = DMA_DEV_TO_MEM;
408 cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset;
409 cfg.src_addr_width = host->dma->dma_buswidth;
410 if (!cfg.src_addr_width)
411 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
413 ret = dmaengine_slave_config(host->chan_rx, &cfg);
417 host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA);
418 if (!host->bounce_buf)
421 init_completion(&host->dma_dataend);
422 tasklet_init(&host->dma_issue,
423 renesas_sdhi_sys_dmac_issue_tasklet_fn,
424 (unsigned long)host);
427 renesas_sdhi_sys_dmac_enable_dma(host, true);
433 dma_release_channel(host->chan_rx);
434 host->chan_rx = NULL;
437 dma_release_channel(host->chan_tx);
438 host->chan_tx = NULL;
441 static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host)
444 struct dma_chan *chan = host->chan_tx;
446 host->chan_tx = NULL;
447 dma_release_channel(chan);
450 struct dma_chan *chan = host->chan_rx;
452 host->chan_rx = NULL;
453 dma_release_channel(chan);
455 if (host->bounce_buf) {
456 free_pages((unsigned long)host->bounce_buf, 0);
457 host->bounce_buf = NULL;
461 static const struct tmio_mmc_dma_ops renesas_sdhi_sys_dmac_dma_ops = {
462 .start = renesas_sdhi_sys_dmac_start_dma,
463 .enable = renesas_sdhi_sys_dmac_enable_dma,
464 .request = renesas_sdhi_sys_dmac_request_dma,
465 .release = renesas_sdhi_sys_dmac_release_dma,
466 .abort = renesas_sdhi_sys_dmac_abort_dma,
467 .dataend = renesas_sdhi_sys_dmac_dataend_dma,
471 * Whitelist of specific R-Car Gen3 SoC ES versions to use this DMAC
472 * implementation. Currently empty as all supported ES versions use
475 static const struct soc_device_attribute gen3_soc_whitelist[] = {
479 static int renesas_sdhi_sys_dmac_probe(struct platform_device *pdev)
481 if (of_device_get_match_data(&pdev->dev) == &of_rcar_gen3_compatible &&
482 !soc_device_match(gen3_soc_whitelist))
485 return renesas_sdhi_probe(pdev, &renesas_sdhi_sys_dmac_dma_ops);
488 static const struct dev_pm_ops renesas_sdhi_sys_dmac_dev_pm_ops = {
489 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
490 pm_runtime_force_resume)
491 SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
492 tmio_mmc_host_runtime_resume,
496 static struct platform_driver renesas_sys_dmac_sdhi_driver = {
498 .name = "sh_mobile_sdhi",
499 .pm = &renesas_sdhi_sys_dmac_dev_pm_ops,
500 .of_match_table = renesas_sdhi_sys_dmac_of_match,
502 .probe = renesas_sdhi_sys_dmac_probe,
503 .remove = renesas_sdhi_remove,
506 module_platform_driver(renesas_sys_dmac_sdhi_driver);
508 MODULE_DESCRIPTION("Renesas SDHI driver");
509 MODULE_AUTHOR("Magnus Damm");
510 MODULE_LICENSE("GPL v2");
511 MODULE_ALIAS("platform:sh_mobile_sdhi");