1f707079dSWolfram Sang // SPDX-License-Identifier: GPL-2.0 2c2a96987SSimon Horman /* 32a68ea78SSimon Horman * DMA support use of SYS DMAC with SDHI SD/SDIO controller 4c2a96987SSimon Horman * 5f49bdcdeSWolfram Sang * Copyright (C) 2016-19 Renesas Electronics Corporation 6f49bdcdeSWolfram Sang * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang 787317c4dSSimon Horman * Copyright (C) 2017 Horms Solutions, Simon Horman 8c2a96987SSimon Horman * Copyright (C) 2010-2011 Guennadi Liakhovetski 9c2a96987SSimon Horman */ 10c2a96987SSimon Horman 11c2a96987SSimon Horman #include <linux/device.h> 12c2a96987SSimon Horman #include <linux/dma-mapping.h> 13c2a96987SSimon Horman #include <linux/dmaengine.h> 14c2a96987SSimon Horman #include <linux/mfd/tmio.h> 15c2a96987SSimon Horman #include <linux/mmc/host.h> 169d08428aSSimon Horman #include <linux/mod_devicetable.h> 179d08428aSSimon Horman #include <linux/module.h> 18cd09780fSSimon Horman #include <linux/of_device.h> 19c2a96987SSimon Horman #include <linux/pagemap.h> 20c2a96987SSimon Horman #include <linux/scatterlist.h> 21cd09780fSSimon Horman #include <linux/sys_soc.h> 22c2a96987SSimon Horman 239d08428aSSimon Horman #include "renesas_sdhi.h" 24c2a96987SSimon Horman #include "tmio_mmc.h" 25c2a96987SSimon Horman 26c2a96987SSimon Horman #define TMIO_MMC_MIN_DMA_LEN 8 27c2a96987SSimon Horman 289d08428aSSimon Horman static const struct renesas_sdhi_of_data of_default_cfg = { 299d08428aSSimon Horman .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT, 309d08428aSSimon Horman }; 319d08428aSSimon Horman 329d08428aSSimon Horman static const struct renesas_sdhi_of_data of_rz_compatible = { 3392b7db8eSWolfram Sang .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_32BIT_DATA_PORT | 3492b7db8eSWolfram Sang TMIO_MMC_HAVE_CBSY, 359d08428aSSimon Horman .tmio_ocr_mask = MMC_VDD_32_33, 369d08428aSSimon Horman .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ, 379d08428aSSimon Horman }; 389d08428aSSimon Horman 399d08428aSSimon Horman static const struct renesas_sdhi_of_data of_rcar_gen1_compatible = { 402ad1db05SMasahiro Yamada .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL, 419d08428aSSimon Horman .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ, 42ef5332c1SWolfram Sang .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT, 439d08428aSSimon Horman }; 449d08428aSSimon Horman 459d08428aSSimon Horman /* Definitions for sampling clocks */ 469d08428aSSimon Horman static struct renesas_sdhi_scc rcar_gen2_scc_taps[] = { 479d08428aSSimon Horman { 489d08428aSSimon Horman .clk_rate = 156000000, 499d08428aSSimon Horman .tap = 0x00000703, 509d08428aSSimon Horman }, 519d08428aSSimon Horman { 529d08428aSSimon Horman .clk_rate = 0, 539d08428aSSimon Horman .tap = 0x00000300, 549d08428aSSimon Horman }, 559d08428aSSimon Horman }; 569d08428aSSimon Horman 579d08428aSSimon Horman static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = { 582ad1db05SMasahiro Yamada .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL | 592ad1db05SMasahiro Yamada TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2, 60921579b2SWolfram Sang .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | 61921579b2SWolfram Sang MMC_CAP_CMD23, 62ef5332c1SWolfram Sang .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT, 639d08428aSSimon Horman .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES, 649d08428aSSimon Horman .dma_rx_offset = 0x2000, 659d08428aSSimon Horman .scc_offset = 0x0300, 669d08428aSSimon Horman .taps = rcar_gen2_scc_taps, 679d08428aSSimon Horman .taps_num = ARRAY_SIZE(rcar_gen2_scc_taps), 682a55c1eaSWolfram Sang .max_blk_count = UINT_MAX / TMIO_MAX_BLK_SIZE, 699d08428aSSimon Horman }; 709d08428aSSimon Horman 719d08428aSSimon Horman static const struct of_device_id renesas_sdhi_sys_dmac_of_match[] = { 729d08428aSSimon Horman { .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, }, 739d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, }, 749d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, }, 759d08428aSSimon Horman { .compatible = "renesas,sdhi-r7s72100", .data = &of_rz_compatible, }, 769d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, }, 779d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, }, 78c16a854eSBiju Das { .compatible = "renesas,sdhi-r8a7743", .data = &of_rcar_gen2_compatible, }, 79c16a854eSBiju Das { .compatible = "renesas,sdhi-r8a7745", .data = &of_rcar_gen2_compatible, }, 809d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, }, 819d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, }, 829d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, }, 839d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, }, 849d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, }, 85d6dc425aSSimon Horman { .compatible = "renesas,rcar-gen1-sdhi", .data = &of_rcar_gen1_compatible, }, 86d6dc425aSSimon Horman { .compatible = "renesas,rcar-gen2-sdhi", .data = &of_rcar_gen2_compatible, }, 87d6dc425aSSimon Horman { .compatible = "renesas,sdhi-shmobile" }, 889d08428aSSimon Horman {}, 899d08428aSSimon Horman }; 909d08428aSSimon Horman MODULE_DEVICE_TABLE(of, renesas_sdhi_sys_dmac_of_match); 919d08428aSSimon Horman 92c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_enable_dma(struct tmio_mmc_host *host, 93c2a96987SSimon Horman bool enable) 94c2a96987SSimon Horman { 95058db286SMasahiro Yamada struct renesas_sdhi *priv = host_to_priv(host); 96058db286SMasahiro Yamada 97c2a96987SSimon Horman if (!host->chan_tx || !host->chan_rx) 98c2a96987SSimon Horman return; 99c2a96987SSimon Horman 100058db286SMasahiro Yamada if (priv->dma_priv.enable) 101058db286SMasahiro Yamada priv->dma_priv.enable(host, enable); 102c2a96987SSimon Horman } 103c2a96987SSimon Horman 104c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_abort_dma(struct tmio_mmc_host *host) 105c2a96987SSimon Horman { 106c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, false); 107c2a96987SSimon Horman 108c2a96987SSimon Horman if (host->chan_rx) 109c2a96987SSimon Horman dmaengine_terminate_all(host->chan_rx); 110c2a96987SSimon Horman if (host->chan_tx) 111c2a96987SSimon Horman dmaengine_terminate_all(host->chan_tx); 112c2a96987SSimon Horman 113c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, true); 114c2a96987SSimon Horman } 115c2a96987SSimon Horman 11692d0f925SSimon Horman static void renesas_sdhi_sys_dmac_dataend_dma(struct tmio_mmc_host *host) 11792d0f925SSimon Horman { 11890d95106SMasahiro Yamada struct renesas_sdhi *priv = host_to_priv(host); 11990d95106SMasahiro Yamada 12090d95106SMasahiro Yamada complete(&priv->dma_priv.dma_dataend); 12192d0f925SSimon Horman } 12292d0f925SSimon Horman 123c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_dma_callback(void *arg) 124c2a96987SSimon Horman { 125c2a96987SSimon Horman struct tmio_mmc_host *host = arg; 12690d95106SMasahiro Yamada struct renesas_sdhi *priv = host_to_priv(host); 127c2a96987SSimon Horman 128c2a96987SSimon Horman spin_lock_irq(&host->lock); 129c2a96987SSimon Horman 130c2a96987SSimon Horman if (!host->data) 131c2a96987SSimon Horman goto out; 132c2a96987SSimon Horman 133c2a96987SSimon Horman if (host->data->flags & MMC_DATA_READ) 134c2a96987SSimon Horman dma_unmap_sg(host->chan_rx->device->dev, 135c2a96987SSimon Horman host->sg_ptr, host->sg_len, 136c2a96987SSimon Horman DMA_FROM_DEVICE); 137c2a96987SSimon Horman else 138c2a96987SSimon Horman dma_unmap_sg(host->chan_tx->device->dev, 139c2a96987SSimon Horman host->sg_ptr, host->sg_len, 140c2a96987SSimon Horman DMA_TO_DEVICE); 141c2a96987SSimon Horman 142c2a96987SSimon Horman spin_unlock_irq(&host->lock); 143c2a96987SSimon Horman 14490d95106SMasahiro Yamada wait_for_completion(&priv->dma_priv.dma_dataend); 145c2a96987SSimon Horman 146c2a96987SSimon Horman spin_lock_irq(&host->lock); 147c2a96987SSimon Horman tmio_mmc_do_data_irq(host); 148c2a96987SSimon Horman out: 149c2a96987SSimon Horman spin_unlock_irq(&host->lock); 150c2a96987SSimon Horman } 151c2a96987SSimon Horman 152c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host) 153c2a96987SSimon Horman { 15490d95106SMasahiro Yamada struct renesas_sdhi *priv = host_to_priv(host); 155c2a96987SSimon Horman struct scatterlist *sg = host->sg_ptr, *sg_tmp; 156c2a96987SSimon Horman struct dma_async_tx_descriptor *desc = NULL; 157c2a96987SSimon Horman struct dma_chan *chan = host->chan_rx; 158c2a96987SSimon Horman dma_cookie_t cookie; 159c2a96987SSimon Horman int ret, i; 160c2a96987SSimon Horman bool aligned = true, multiple = true; 161c2a96987SSimon Horman unsigned int align = (1 << host->pdata->alignment_shift) - 1; 162c2a96987SSimon Horman 163c2a96987SSimon Horman for_each_sg(sg, sg_tmp, host->sg_len, i) { 164c2a96987SSimon Horman if (sg_tmp->offset & align) 165c2a96987SSimon Horman aligned = false; 166c2a96987SSimon Horman if (sg_tmp->length & align) { 167c2a96987SSimon Horman multiple = false; 168c2a96987SSimon Horman break; 169c2a96987SSimon Horman } 170c2a96987SSimon Horman } 171c2a96987SSimon Horman 172c2a96987SSimon Horman if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE || 173c2a96987SSimon Horman (align & PAGE_MASK))) || !multiple) { 174c2a96987SSimon Horman ret = -EINVAL; 175c2a96987SSimon Horman goto pio; 176c2a96987SSimon Horman } 177c2a96987SSimon Horman 178d3dd5db0SMasahiro Yamada if (sg->length < TMIO_MMC_MIN_DMA_LEN) 179c2a96987SSimon Horman return; 180c2a96987SSimon Horman 181c2a96987SSimon Horman /* The only sg element can be unaligned, use our bounce buffer then */ 182c2a96987SSimon Horman if (!aligned) { 183c2a96987SSimon Horman sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length); 184c2a96987SSimon Horman host->sg_ptr = &host->bounce_sg; 185c2a96987SSimon Horman sg = host->sg_ptr; 186c2a96987SSimon Horman } 187c2a96987SSimon Horman 188c2a96987SSimon Horman ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE); 189c2a96987SSimon Horman if (ret > 0) 1902fe35968SSimon Horman desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_DEV_TO_MEM, 1912fe35968SSimon Horman DMA_CTRL_ACK); 192c2a96987SSimon Horman 193c2a96987SSimon Horman if (desc) { 19490d95106SMasahiro Yamada reinit_completion(&priv->dma_priv.dma_dataend); 195c2a96987SSimon Horman desc->callback = renesas_sdhi_sys_dmac_dma_callback; 196c2a96987SSimon Horman desc->callback_param = host; 197c2a96987SSimon Horman 198c2a96987SSimon Horman cookie = dmaengine_submit(desc); 199c2a96987SSimon Horman if (cookie < 0) { 200c2a96987SSimon Horman desc = NULL; 201c2a96987SSimon Horman ret = cookie; 202c2a96987SSimon Horman } 203d3dd5db0SMasahiro Yamada host->dma_on = true; 204c2a96987SSimon Horman } 205c2a96987SSimon Horman pio: 206c2a96987SSimon Horman if (!desc) { 207c2a96987SSimon Horman /* DMA failed, fall back to PIO */ 208c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, false); 209c2a96987SSimon Horman if (ret >= 0) 210c2a96987SSimon Horman ret = -EIO; 211c2a96987SSimon Horman host->chan_rx = NULL; 212c2a96987SSimon Horman dma_release_channel(chan); 213c2a96987SSimon Horman /* Free the Tx channel too */ 214c2a96987SSimon Horman chan = host->chan_tx; 215c2a96987SSimon Horman if (chan) { 216c2a96987SSimon Horman host->chan_tx = NULL; 217c2a96987SSimon Horman dma_release_channel(chan); 218c2a96987SSimon Horman } 219c2a96987SSimon Horman dev_warn(&host->pdev->dev, 220c2a96987SSimon Horman "DMA failed: %d, falling back to PIO\n", ret); 221c2a96987SSimon Horman } 222c2a96987SSimon Horman } 223c2a96987SSimon Horman 224c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host) 225c2a96987SSimon Horman { 22690d95106SMasahiro Yamada struct renesas_sdhi *priv = host_to_priv(host); 227c2a96987SSimon Horman struct scatterlist *sg = host->sg_ptr, *sg_tmp; 228c2a96987SSimon Horman struct dma_async_tx_descriptor *desc = NULL; 229c2a96987SSimon Horman struct dma_chan *chan = host->chan_tx; 230c2a96987SSimon Horman dma_cookie_t cookie; 231c2a96987SSimon Horman int ret, i; 232c2a96987SSimon Horman bool aligned = true, multiple = true; 233c2a96987SSimon Horman unsigned int align = (1 << host->pdata->alignment_shift) - 1; 234c2a96987SSimon Horman 235c2a96987SSimon Horman for_each_sg(sg, sg_tmp, host->sg_len, i) { 236c2a96987SSimon Horman if (sg_tmp->offset & align) 237c2a96987SSimon Horman aligned = false; 238c2a96987SSimon Horman if (sg_tmp->length & align) { 239c2a96987SSimon Horman multiple = false; 240c2a96987SSimon Horman break; 241c2a96987SSimon Horman } 242c2a96987SSimon Horman } 243c2a96987SSimon Horman 244c2a96987SSimon Horman if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE || 245c2a96987SSimon Horman (align & PAGE_MASK))) || !multiple) { 246c2a96987SSimon Horman ret = -EINVAL; 247c2a96987SSimon Horman goto pio; 248c2a96987SSimon Horman } 249c2a96987SSimon Horman 250d3dd5db0SMasahiro Yamada if (sg->length < TMIO_MMC_MIN_DMA_LEN) 251c2a96987SSimon Horman return; 252c2a96987SSimon Horman 253c2a96987SSimon Horman /* The only sg element can be unaligned, use our bounce buffer then */ 254c2a96987SSimon Horman if (!aligned) { 255c2a96987SSimon Horman unsigned long flags; 256c2a96987SSimon Horman void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags); 2572fe35968SSimon Horman 258c2a96987SSimon Horman sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length); 259c2a96987SSimon Horman memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length); 260c2a96987SSimon Horman tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr); 261c2a96987SSimon Horman host->sg_ptr = &host->bounce_sg; 262c2a96987SSimon Horman sg = host->sg_ptr; 263c2a96987SSimon Horman } 264c2a96987SSimon Horman 265c2a96987SSimon Horman ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE); 266c2a96987SSimon Horman if (ret > 0) 2672fe35968SSimon Horman desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_MEM_TO_DEV, 2682fe35968SSimon Horman DMA_CTRL_ACK); 269c2a96987SSimon Horman 270c2a96987SSimon Horman if (desc) { 27190d95106SMasahiro Yamada reinit_completion(&priv->dma_priv.dma_dataend); 272c2a96987SSimon Horman desc->callback = renesas_sdhi_sys_dmac_dma_callback; 273c2a96987SSimon Horman desc->callback_param = host; 274c2a96987SSimon Horman 275c2a96987SSimon Horman cookie = dmaengine_submit(desc); 276c2a96987SSimon Horman if (cookie < 0) { 277c2a96987SSimon Horman desc = NULL; 278c2a96987SSimon Horman ret = cookie; 279c2a96987SSimon Horman } 280d3dd5db0SMasahiro Yamada host->dma_on = true; 281c2a96987SSimon Horman } 282c2a96987SSimon Horman pio: 283c2a96987SSimon Horman if (!desc) { 284c2a96987SSimon Horman /* DMA failed, fall back to PIO */ 285c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, false); 286c2a96987SSimon Horman if (ret >= 0) 287c2a96987SSimon Horman ret = -EIO; 288c2a96987SSimon Horman host->chan_tx = NULL; 289c2a96987SSimon Horman dma_release_channel(chan); 290c2a96987SSimon Horman /* Free the Rx channel too */ 291c2a96987SSimon Horman chan = host->chan_rx; 292c2a96987SSimon Horman if (chan) { 293c2a96987SSimon Horman host->chan_rx = NULL; 294c2a96987SSimon Horman dma_release_channel(chan); 295c2a96987SSimon Horman } 296c2a96987SSimon Horman dev_warn(&host->pdev->dev, 297c2a96987SSimon Horman "DMA failed: %d, falling back to PIO\n", ret); 298c2a96987SSimon Horman } 299c2a96987SSimon Horman } 300c2a96987SSimon Horman 301c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host, 302c2a96987SSimon Horman struct mmc_data *data) 303c2a96987SSimon Horman { 304c2a96987SSimon Horman if (data->flags & MMC_DATA_READ) { 305c2a96987SSimon Horman if (host->chan_rx) 306c2a96987SSimon Horman renesas_sdhi_sys_dmac_start_dma_rx(host); 307c2a96987SSimon Horman } else { 308c2a96987SSimon Horman if (host->chan_tx) 309c2a96987SSimon Horman renesas_sdhi_sys_dmac_start_dma_tx(host); 310c2a96987SSimon Horman } 311c2a96987SSimon Horman } 312c2a96987SSimon Horman 313c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_issue_tasklet_fn(unsigned long priv) 314c2a96987SSimon Horman { 315c2a96987SSimon Horman struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv; 316c2a96987SSimon Horman struct dma_chan *chan = NULL; 317c2a96987SSimon Horman 318c2a96987SSimon Horman spin_lock_irq(&host->lock); 319c2a96987SSimon Horman 320b8155d3fSDan Carpenter if (host->data) { 321c2a96987SSimon Horman if (host->data->flags & MMC_DATA_READ) 322c2a96987SSimon Horman chan = host->chan_rx; 323c2a96987SSimon Horman else 324c2a96987SSimon Horman chan = host->chan_tx; 325c2a96987SSimon Horman } 326c2a96987SSimon Horman 327c2a96987SSimon Horman spin_unlock_irq(&host->lock); 328c2a96987SSimon Horman 329c2a96987SSimon Horman tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND); 330c2a96987SSimon Horman 331c2a96987SSimon Horman if (chan) 332c2a96987SSimon Horman dma_async_issue_pending(chan); 333c2a96987SSimon Horman } 334c2a96987SSimon Horman 335c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host, 336c2a96987SSimon Horman struct tmio_mmc_data *pdata) 337c2a96987SSimon Horman { 338058db286SMasahiro Yamada struct renesas_sdhi *priv = host_to_priv(host); 339058db286SMasahiro Yamada 340c2a96987SSimon Horman /* We can only either use DMA for both Tx and Rx or not use it at all */ 3412487e7efSMasahiro Yamada if (!host->pdev->dev.of_node && 3422487e7efSMasahiro Yamada (!pdata->chan_priv_tx || !pdata->chan_priv_rx)) 343c2a96987SSimon Horman return; 344c2a96987SSimon Horman 345c2a96987SSimon Horman if (!host->chan_tx && !host->chan_rx) { 346c2a96987SSimon Horman struct resource *res = platform_get_resource(host->pdev, 347c2a96987SSimon Horman IORESOURCE_MEM, 0); 348c2a96987SSimon Horman struct dma_slave_config cfg = {}; 349c2a96987SSimon Horman dma_cap_mask_t mask; 350c2a96987SSimon Horman int ret; 351c2a96987SSimon Horman 352c2a96987SSimon Horman if (!res) 353c2a96987SSimon Horman return; 354c2a96987SSimon Horman 355c2a96987SSimon Horman dma_cap_zero(mask); 356c2a96987SSimon Horman dma_cap_set(DMA_SLAVE, mask); 357c2a96987SSimon Horman 358c2a96987SSimon Horman host->chan_tx = dma_request_slave_channel_compat(mask, 359058db286SMasahiro Yamada priv->dma_priv.filter, pdata->chan_priv_tx, 360c2a96987SSimon Horman &host->pdev->dev, "tx"); 361c2a96987SSimon Horman dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__, 362c2a96987SSimon Horman host->chan_tx); 363c2a96987SSimon Horman 364c2a96987SSimon Horman if (!host->chan_tx) 365c2a96987SSimon Horman return; 366c2a96987SSimon Horman 367c2a96987SSimon Horman cfg.direction = DMA_MEM_TO_DEV; 3682fe35968SSimon Horman cfg.dst_addr = res->start + 3692fe35968SSimon Horman (CTL_SD_DATA_PORT << host->bus_shift); 370058db286SMasahiro Yamada cfg.dst_addr_width = priv->dma_priv.dma_buswidth; 371c2a96987SSimon Horman if (!cfg.dst_addr_width) 372c2a96987SSimon Horman cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; 373c2a96987SSimon Horman cfg.src_addr = 0; 374c2a96987SSimon Horman ret = dmaengine_slave_config(host->chan_tx, &cfg); 375c2a96987SSimon Horman if (ret < 0) 376c2a96987SSimon Horman goto ecfgtx; 377c2a96987SSimon Horman 378c2a96987SSimon Horman host->chan_rx = dma_request_slave_channel_compat(mask, 379058db286SMasahiro Yamada priv->dma_priv.filter, pdata->chan_priv_rx, 380c2a96987SSimon Horman &host->pdev->dev, "rx"); 381c2a96987SSimon Horman dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__, 382c2a96987SSimon Horman host->chan_rx); 383c2a96987SSimon Horman 384c2a96987SSimon Horman if (!host->chan_rx) 385c2a96987SSimon Horman goto ereqrx; 386c2a96987SSimon Horman 387c2a96987SSimon Horman cfg.direction = DMA_DEV_TO_MEM; 388c2a96987SSimon Horman cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset; 389058db286SMasahiro Yamada cfg.src_addr_width = priv->dma_priv.dma_buswidth; 390c2a96987SSimon Horman if (!cfg.src_addr_width) 391c2a96987SSimon Horman cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; 392c2a96987SSimon Horman cfg.dst_addr = 0; 393c2a96987SSimon Horman ret = dmaengine_slave_config(host->chan_rx, &cfg); 394c2a96987SSimon Horman if (ret < 0) 395c2a96987SSimon Horman goto ecfgrx; 396c2a96987SSimon Horman 397c2a96987SSimon Horman host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA); 398c2a96987SSimon Horman if (!host->bounce_buf) 399c2a96987SSimon Horman goto ebouncebuf; 400c2a96987SSimon Horman 40190d95106SMasahiro Yamada init_completion(&priv->dma_priv.dma_dataend); 402c2a96987SSimon Horman tasklet_init(&host->dma_issue, 403c2a96987SSimon Horman renesas_sdhi_sys_dmac_issue_tasklet_fn, 404c2a96987SSimon Horman (unsigned long)host); 405c2a96987SSimon Horman } 406c2a96987SSimon Horman 407c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, true); 408c2a96987SSimon Horman 409c2a96987SSimon Horman return; 410c2a96987SSimon Horman 411c2a96987SSimon Horman ebouncebuf: 412c2a96987SSimon Horman ecfgrx: 413c2a96987SSimon Horman dma_release_channel(host->chan_rx); 414c2a96987SSimon Horman host->chan_rx = NULL; 415c2a96987SSimon Horman ereqrx: 416c2a96987SSimon Horman ecfgtx: 417c2a96987SSimon Horman dma_release_channel(host->chan_tx); 418c2a96987SSimon Horman host->chan_tx = NULL; 419c2a96987SSimon Horman } 420c2a96987SSimon Horman 421c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host) 422c2a96987SSimon Horman { 423c2a96987SSimon Horman if (host->chan_tx) { 424c2a96987SSimon Horman struct dma_chan *chan = host->chan_tx; 4252fe35968SSimon Horman 426c2a96987SSimon Horman host->chan_tx = NULL; 427c2a96987SSimon Horman dma_release_channel(chan); 428c2a96987SSimon Horman } 429c2a96987SSimon Horman if (host->chan_rx) { 430c2a96987SSimon Horman struct dma_chan *chan = host->chan_rx; 4312fe35968SSimon Horman 432c2a96987SSimon Horman host->chan_rx = NULL; 433c2a96987SSimon Horman dma_release_channel(chan); 434c2a96987SSimon Horman } 435c2a96987SSimon Horman if (host->bounce_buf) { 436c2a96987SSimon Horman free_pages((unsigned long)host->bounce_buf, 0); 437c2a96987SSimon Horman host->bounce_buf = NULL; 438c2a96987SSimon Horman } 439c2a96987SSimon Horman } 440c2a96987SSimon Horman 441c2a96987SSimon Horman static const struct tmio_mmc_dma_ops renesas_sdhi_sys_dmac_dma_ops = { 442c2a96987SSimon Horman .start = renesas_sdhi_sys_dmac_start_dma, 443c2a96987SSimon Horman .enable = renesas_sdhi_sys_dmac_enable_dma, 444c2a96987SSimon Horman .request = renesas_sdhi_sys_dmac_request_dma, 445c2a96987SSimon Horman .release = renesas_sdhi_sys_dmac_release_dma, 446c2a96987SSimon Horman .abort = renesas_sdhi_sys_dmac_abort_dma, 44792d0f925SSimon Horman .dataend = renesas_sdhi_sys_dmac_dataend_dma, 448c2a96987SSimon Horman }; 449c2a96987SSimon Horman 4509d08428aSSimon Horman static int renesas_sdhi_sys_dmac_probe(struct platform_device *pdev) 451c2a96987SSimon Horman { 4529d08428aSSimon Horman return renesas_sdhi_probe(pdev, &renesas_sdhi_sys_dmac_dma_ops); 453c2a96987SSimon Horman } 4549d08428aSSimon Horman 4559d08428aSSimon Horman static const struct dev_pm_ops renesas_sdhi_sys_dmac_dev_pm_ops = { 4569d08428aSSimon Horman SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 4579d08428aSSimon Horman pm_runtime_force_resume) 4589d08428aSSimon Horman SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend, 4599d08428aSSimon Horman tmio_mmc_host_runtime_resume, 4609d08428aSSimon Horman NULL) 4619d08428aSSimon Horman }; 4629d08428aSSimon Horman 4639d08428aSSimon Horman static struct platform_driver renesas_sys_dmac_sdhi_driver = { 4649d08428aSSimon Horman .driver = { 4659d08428aSSimon Horman .name = "sh_mobile_sdhi", 4667320915cSDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS, 4679d08428aSSimon Horman .pm = &renesas_sdhi_sys_dmac_dev_pm_ops, 4689d08428aSSimon Horman .of_match_table = renesas_sdhi_sys_dmac_of_match, 4699d08428aSSimon Horman }, 4709d08428aSSimon Horman .probe = renesas_sdhi_sys_dmac_probe, 4719d08428aSSimon Horman .remove = renesas_sdhi_remove, 4729d08428aSSimon Horman }; 4739d08428aSSimon Horman 4749d08428aSSimon Horman module_platform_driver(renesas_sys_dmac_sdhi_driver); 4759d08428aSSimon Horman 4769d08428aSSimon Horman MODULE_DESCRIPTION("Renesas SDHI driver"); 4779d08428aSSimon Horman MODULE_AUTHOR("Magnus Damm"); 4789d08428aSSimon Horman MODULE_LICENSE("GPL v2"); 4799d08428aSSimon Horman MODULE_ALIAS("platform:sh_mobile_sdhi"); 480