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_CLK_ACTUAL,
44 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
45 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
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_CLK_ACTUAL |
62 TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
63 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
65 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
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_r8a7795_compatible = {
83 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
84 TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2 |
85 TMIO_MMC_HAVE_4TAP_HS400,
86 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
88 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
91 .taps = rcar_gen3_scc_taps,
92 .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps),
95 static const struct renesas_sdhi_of_data of_rcar_gen3_compatible = {
96 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
97 TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
98 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
100 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
102 .scc_offset = 0x1000,
103 .taps = rcar_gen3_scc_taps,
104 .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps),
107 static const struct of_device_id renesas_sdhi_sys_dmac_of_match[] = {
108 { .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, },
109 { .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, },
110 { .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, },
111 { .compatible = "renesas,sdhi-r7s72100", .data = &of_rz_compatible, },
112 { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
113 { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
114 { .compatible = "renesas,sdhi-r8a7743", .data = &of_rcar_gen2_compatible, },
115 { .compatible = "renesas,sdhi-r8a7745", .data = &of_rcar_gen2_compatible, },
116 { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
117 { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
118 { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
119 { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
120 { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
121 { .compatible = "renesas,sdhi-r8a7795", .data = &of_rcar_r8a7795_compatible, },
122 { .compatible = "renesas,sdhi-r8a7796", .data = &of_rcar_r8a7795_compatible, },
123 { .compatible = "renesas,rcar-gen1-sdhi", .data = &of_rcar_gen1_compatible, },
124 { .compatible = "renesas,rcar-gen2-sdhi", .data = &of_rcar_gen2_compatible, },
125 { .compatible = "renesas,rcar-gen3-sdhi", .data = &of_rcar_gen3_compatible, },
126 { .compatible = "renesas,sdhi-shmobile" },
129 MODULE_DEVICE_TABLE(of, renesas_sdhi_sys_dmac_of_match);
131 static void renesas_sdhi_sys_dmac_enable_dma(struct tmio_mmc_host *host,
134 struct renesas_sdhi *priv = host_to_priv(host);
136 if (!host->chan_tx || !host->chan_rx)
139 if (priv->dma_priv.enable)
140 priv->dma_priv.enable(host, enable);
143 static void renesas_sdhi_sys_dmac_abort_dma(struct tmio_mmc_host *host)
145 renesas_sdhi_sys_dmac_enable_dma(host, false);
148 dmaengine_terminate_all(host->chan_rx);
150 dmaengine_terminate_all(host->chan_tx);
152 renesas_sdhi_sys_dmac_enable_dma(host, true);
155 static void renesas_sdhi_sys_dmac_dataend_dma(struct tmio_mmc_host *host)
157 struct renesas_sdhi *priv = host_to_priv(host);
159 complete(&priv->dma_priv.dma_dataend);
162 static void renesas_sdhi_sys_dmac_dma_callback(void *arg)
164 struct tmio_mmc_host *host = arg;
165 struct renesas_sdhi *priv = host_to_priv(host);
167 spin_lock_irq(&host->lock);
172 if (host->data->flags & MMC_DATA_READ)
173 dma_unmap_sg(host->chan_rx->device->dev,
174 host->sg_ptr, host->sg_len,
177 dma_unmap_sg(host->chan_tx->device->dev,
178 host->sg_ptr, host->sg_len,
181 spin_unlock_irq(&host->lock);
183 wait_for_completion(&priv->dma_priv.dma_dataend);
185 spin_lock_irq(&host->lock);
186 tmio_mmc_do_data_irq(host);
188 spin_unlock_irq(&host->lock);
191 static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host)
193 struct renesas_sdhi *priv = host_to_priv(host);
194 struct scatterlist *sg = host->sg_ptr, *sg_tmp;
195 struct dma_async_tx_descriptor *desc = NULL;
196 struct dma_chan *chan = host->chan_rx;
199 bool aligned = true, multiple = true;
200 unsigned int align = (1 << host->pdata->alignment_shift) - 1;
202 for_each_sg(sg, sg_tmp, host->sg_len, i) {
203 if (sg_tmp->offset & align)
205 if (sg_tmp->length & align) {
211 if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
212 (align & PAGE_MASK))) || !multiple) {
217 if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
218 host->force_pio = true;
222 /* The only sg element can be unaligned, use our bounce buffer then */
224 sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
225 host->sg_ptr = &host->bounce_sg;
229 ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
231 desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_DEV_TO_MEM,
235 reinit_completion(&priv->dma_priv.dma_dataend);
236 desc->callback = renesas_sdhi_sys_dmac_dma_callback;
237 desc->callback_param = host;
239 cookie = dmaengine_submit(desc);
247 /* DMA failed, fall back to PIO */
248 renesas_sdhi_sys_dmac_enable_dma(host, false);
251 host->chan_rx = NULL;
252 dma_release_channel(chan);
253 /* Free the Tx channel too */
254 chan = host->chan_tx;
256 host->chan_tx = NULL;
257 dma_release_channel(chan);
259 dev_warn(&host->pdev->dev,
260 "DMA failed: %d, falling back to PIO\n", ret);
264 static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host)
266 struct renesas_sdhi *priv = host_to_priv(host);
267 struct scatterlist *sg = host->sg_ptr, *sg_tmp;
268 struct dma_async_tx_descriptor *desc = NULL;
269 struct dma_chan *chan = host->chan_tx;
272 bool aligned = true, multiple = true;
273 unsigned int align = (1 << host->pdata->alignment_shift) - 1;
275 for_each_sg(sg, sg_tmp, host->sg_len, i) {
276 if (sg_tmp->offset & align)
278 if (sg_tmp->length & align) {
284 if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
285 (align & PAGE_MASK))) || !multiple) {
290 if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
291 host->force_pio = true;
295 /* The only sg element can be unaligned, use our bounce buffer then */
298 void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags);
300 sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
301 memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length);
302 tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr);
303 host->sg_ptr = &host->bounce_sg;
307 ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
309 desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_MEM_TO_DEV,
313 reinit_completion(&priv->dma_priv.dma_dataend);
314 desc->callback = renesas_sdhi_sys_dmac_dma_callback;
315 desc->callback_param = host;
317 cookie = dmaengine_submit(desc);
325 /* DMA failed, fall back to PIO */
326 renesas_sdhi_sys_dmac_enable_dma(host, false);
329 host->chan_tx = NULL;
330 dma_release_channel(chan);
331 /* Free the Rx channel too */
332 chan = host->chan_rx;
334 host->chan_rx = NULL;
335 dma_release_channel(chan);
337 dev_warn(&host->pdev->dev,
338 "DMA failed: %d, falling back to PIO\n", ret);
342 static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host,
343 struct mmc_data *data)
345 if (data->flags & MMC_DATA_READ) {
347 renesas_sdhi_sys_dmac_start_dma_rx(host);
350 renesas_sdhi_sys_dmac_start_dma_tx(host);
354 static void renesas_sdhi_sys_dmac_issue_tasklet_fn(unsigned long priv)
356 struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
357 struct dma_chan *chan = NULL;
359 spin_lock_irq(&host->lock);
362 if (host->data->flags & MMC_DATA_READ)
363 chan = host->chan_rx;
365 chan = host->chan_tx;
368 spin_unlock_irq(&host->lock);
370 tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
373 dma_async_issue_pending(chan);
376 static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
377 struct tmio_mmc_data *pdata)
379 struct renesas_sdhi *priv = host_to_priv(host);
381 /* We can only either use DMA for both Tx and Rx or not use it at all */
382 if (!host->pdev->dev.of_node &&
383 (!pdata->chan_priv_tx || !pdata->chan_priv_rx))
386 if (!host->chan_tx && !host->chan_rx) {
387 struct resource *res = platform_get_resource(host->pdev,
389 struct dma_slave_config cfg = {};
397 dma_cap_set(DMA_SLAVE, mask);
399 host->chan_tx = dma_request_slave_channel_compat(mask,
400 priv->dma_priv.filter, pdata->chan_priv_tx,
401 &host->pdev->dev, "tx");
402 dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
408 cfg.direction = DMA_MEM_TO_DEV;
409 cfg.dst_addr = res->start +
410 (CTL_SD_DATA_PORT << host->bus_shift);
411 cfg.dst_addr_width = priv->dma_priv.dma_buswidth;
412 if (!cfg.dst_addr_width)
413 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
415 ret = dmaengine_slave_config(host->chan_tx, &cfg);
419 host->chan_rx = dma_request_slave_channel_compat(mask,
420 priv->dma_priv.filter, pdata->chan_priv_rx,
421 &host->pdev->dev, "rx");
422 dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
428 cfg.direction = DMA_DEV_TO_MEM;
429 cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset;
430 cfg.src_addr_width = priv->dma_priv.dma_buswidth;
431 if (!cfg.src_addr_width)
432 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
434 ret = dmaengine_slave_config(host->chan_rx, &cfg);
438 host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA);
439 if (!host->bounce_buf)
442 init_completion(&priv->dma_priv.dma_dataend);
443 tasklet_init(&host->dma_issue,
444 renesas_sdhi_sys_dmac_issue_tasklet_fn,
445 (unsigned long)host);
448 renesas_sdhi_sys_dmac_enable_dma(host, true);
454 dma_release_channel(host->chan_rx);
455 host->chan_rx = NULL;
458 dma_release_channel(host->chan_tx);
459 host->chan_tx = NULL;
462 static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host)
465 struct dma_chan *chan = host->chan_tx;
467 host->chan_tx = NULL;
468 dma_release_channel(chan);
471 struct dma_chan *chan = host->chan_rx;
473 host->chan_rx = NULL;
474 dma_release_channel(chan);
476 if (host->bounce_buf) {
477 free_pages((unsigned long)host->bounce_buf, 0);
478 host->bounce_buf = NULL;
482 static const struct tmio_mmc_dma_ops renesas_sdhi_sys_dmac_dma_ops = {
483 .start = renesas_sdhi_sys_dmac_start_dma,
484 .enable = renesas_sdhi_sys_dmac_enable_dma,
485 .request = renesas_sdhi_sys_dmac_request_dma,
486 .release = renesas_sdhi_sys_dmac_release_dma,
487 .abort = renesas_sdhi_sys_dmac_abort_dma,
488 .dataend = renesas_sdhi_sys_dmac_dataend_dma,
492 * Whitelist of specific R-Car Gen3 SoC ES versions to use this DMAC
493 * implementation. Currently empty as all supported ES versions use
496 static const struct soc_device_attribute gen3_soc_whitelist[] = {
500 static int renesas_sdhi_sys_dmac_probe(struct platform_device *pdev)
502 if ((of_device_get_match_data(&pdev->dev) == &of_rcar_gen3_compatible ||
503 of_device_get_match_data(&pdev->dev) == &of_rcar_r8a7795_compatible) &&
504 !soc_device_match(gen3_soc_whitelist))
507 return renesas_sdhi_probe(pdev, &renesas_sdhi_sys_dmac_dma_ops);
510 static const struct dev_pm_ops renesas_sdhi_sys_dmac_dev_pm_ops = {
511 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
512 pm_runtime_force_resume)
513 SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
514 tmio_mmc_host_runtime_resume,
518 static struct platform_driver renesas_sys_dmac_sdhi_driver = {
520 .name = "sh_mobile_sdhi",
521 .pm = &renesas_sdhi_sys_dmac_dev_pm_ops,
522 .of_match_table = renesas_sdhi_sys_dmac_of_match,
524 .probe = renesas_sdhi_sys_dmac_probe,
525 .remove = renesas_sdhi_remove,
528 module_platform_driver(renesas_sys_dmac_sdhi_driver);
530 MODULE_DESCRIPTION("Renesas SDHI driver");
531 MODULE_AUTHOR("Magnus Damm");
532 MODULE_LICENSE("GPL v2");
533 MODULE_ALIAS("platform:sh_mobile_sdhi");