1c2a96987SSimon Horman /* 22a68ea78SSimon Horman * DMA support use of SYS DMAC with SDHI SD/SDIO controller 3c2a96987SSimon Horman * 487317c4dSSimon Horman * Copyright (C) 2016-17 Renesas Electronics Corporation 587317c4dSSimon Horman * Copyright (C) 2016-17 Sang Engineering, Wolfram Sang 687317c4dSSimon Horman * Copyright (C) 2017 Horms Solutions, Simon Horman 7c2a96987SSimon Horman * Copyright (C) 2010-2011 Guennadi Liakhovetski 8c2a96987SSimon Horman * 9c2a96987SSimon Horman * This program is free software; you can redistribute it and/or modify 10c2a96987SSimon Horman * it under the terms of the GNU General Public License version 2 as 11c2a96987SSimon Horman * published by the Free Software Foundation. 12c2a96987SSimon Horman */ 13c2a96987SSimon Horman 14c2a96987SSimon Horman #include <linux/device.h> 15c2a96987SSimon Horman #include <linux/dma-mapping.h> 16c2a96987SSimon Horman #include <linux/dmaengine.h> 17c2a96987SSimon Horman #include <linux/mfd/tmio.h> 18c2a96987SSimon Horman #include <linux/mmc/host.h> 199d08428aSSimon Horman #include <linux/mod_devicetable.h> 209d08428aSSimon Horman #include <linux/module.h> 21cd09780fSSimon Horman #include <linux/of_device.h> 22c2a96987SSimon Horman #include <linux/pagemap.h> 23c2a96987SSimon Horman #include <linux/scatterlist.h> 24cd09780fSSimon Horman #include <linux/sys_soc.h> 25c2a96987SSimon Horman 269d08428aSSimon Horman #include "renesas_sdhi.h" 27c2a96987SSimon Horman #include "tmio_mmc.h" 28c2a96987SSimon Horman 29c2a96987SSimon Horman #define TMIO_MMC_MIN_DMA_LEN 8 30c2a96987SSimon Horman 319d08428aSSimon Horman static const struct renesas_sdhi_of_data of_default_cfg = { 329d08428aSSimon Horman .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT, 339d08428aSSimon Horman }; 349d08428aSSimon Horman 359d08428aSSimon Horman static const struct renesas_sdhi_of_data of_rz_compatible = { 3692b7db8eSWolfram Sang .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_32BIT_DATA_PORT | 3792b7db8eSWolfram Sang TMIO_MMC_HAVE_CBSY, 389d08428aSSimon Horman .tmio_ocr_mask = MMC_VDD_32_33, 399d08428aSSimon Horman .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ, 409d08428aSSimon Horman }; 419d08428aSSimon Horman 429d08428aSSimon Horman static const struct renesas_sdhi_of_data of_rcar_gen1_compatible = { 439d08428aSSimon Horman .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE | 449d08428aSSimon Horman TMIO_MMC_CLK_ACTUAL, 459d08428aSSimon Horman .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ, 469d08428aSSimon Horman }; 479d08428aSSimon Horman 489d08428aSSimon Horman /* Definitions for sampling clocks */ 499d08428aSSimon Horman static struct renesas_sdhi_scc rcar_gen2_scc_taps[] = { 509d08428aSSimon Horman { 519d08428aSSimon Horman .clk_rate = 156000000, 529d08428aSSimon Horman .tap = 0x00000703, 539d08428aSSimon Horman }, 549d08428aSSimon Horman { 559d08428aSSimon Horman .clk_rate = 0, 569d08428aSSimon Horman .tap = 0x00000300, 579d08428aSSimon Horman }, 589d08428aSSimon Horman }; 599d08428aSSimon Horman 609d08428aSSimon Horman static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = { 619d08428aSSimon Horman .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE | 625124b592SWolfram Sang TMIO_MMC_CLK_ACTUAL | TMIO_MMC_HAVE_CBSY | 635124b592SWolfram Sang TMIO_MMC_MIN_RCAR2, 64921579b2SWolfram Sang .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | 65921579b2SWolfram Sang MMC_CAP_CMD23, 669d08428aSSimon Horman .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES, 679d08428aSSimon Horman .dma_rx_offset = 0x2000, 689d08428aSSimon Horman .scc_offset = 0x0300, 699d08428aSSimon Horman .taps = rcar_gen2_scc_taps, 709d08428aSSimon Horman .taps_num = ARRAY_SIZE(rcar_gen2_scc_taps), 719d08428aSSimon Horman }; 729d08428aSSimon Horman 739d08428aSSimon Horman /* Definitions for sampling clocks */ 749d08428aSSimon Horman static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = { 759d08428aSSimon Horman { 769d08428aSSimon Horman .clk_rate = 0, 779d08428aSSimon Horman .tap = 0x00000300, 789d08428aSSimon Horman }, 799d08428aSSimon Horman }; 809d08428aSSimon Horman 819d08428aSSimon Horman static const struct renesas_sdhi_of_data of_rcar_gen3_compatible = { 829d08428aSSimon Horman .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE | 835124b592SWolfram Sang TMIO_MMC_CLK_ACTUAL | TMIO_MMC_HAVE_CBSY | 845124b592SWolfram Sang TMIO_MMC_MIN_RCAR2, 85921579b2SWolfram Sang .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | 86921579b2SWolfram Sang MMC_CAP_CMD23, 879d08428aSSimon Horman .bus_shift = 2, 889d08428aSSimon Horman .scc_offset = 0x1000, 899d08428aSSimon Horman .taps = rcar_gen3_scc_taps, 909d08428aSSimon Horman .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps), 919d08428aSSimon Horman }; 929d08428aSSimon Horman 939d08428aSSimon Horman static const struct of_device_id renesas_sdhi_sys_dmac_of_match[] = { 949d08428aSSimon Horman { .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, }, 959d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, }, 969d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, }, 979d08428aSSimon Horman { .compatible = "renesas,sdhi-r7s72100", .data = &of_rz_compatible, }, 989d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, }, 999d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, }, 100c16a854eSBiju Das { .compatible = "renesas,sdhi-r8a7743", .data = &of_rcar_gen2_compatible, }, 101c16a854eSBiju Das { .compatible = "renesas,sdhi-r8a7745", .data = &of_rcar_gen2_compatible, }, 1029d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, }, 1039d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, }, 1049d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, }, 1059d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, }, 1069d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, }, 1079d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7795", .data = &of_rcar_gen3_compatible, }, 1089d08428aSSimon Horman { .compatible = "renesas,sdhi-r8a7796", .data = &of_rcar_gen3_compatible, }, 109d6dc425aSSimon Horman { .compatible = "renesas,rcar-gen1-sdhi", .data = &of_rcar_gen1_compatible, }, 110d6dc425aSSimon Horman { .compatible = "renesas,rcar-gen2-sdhi", .data = &of_rcar_gen2_compatible, }, 111d6dc425aSSimon Horman { .compatible = "renesas,rcar-gen3-sdhi", .data = &of_rcar_gen3_compatible, }, 112d6dc425aSSimon Horman { .compatible = "renesas,sdhi-shmobile" }, 1139d08428aSSimon Horman {}, 1149d08428aSSimon Horman }; 1159d08428aSSimon Horman MODULE_DEVICE_TABLE(of, renesas_sdhi_sys_dmac_of_match); 1169d08428aSSimon Horman 117c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_enable_dma(struct tmio_mmc_host *host, 118c2a96987SSimon Horman bool enable) 119c2a96987SSimon Horman { 120c2a96987SSimon Horman if (!host->chan_tx || !host->chan_rx) 121c2a96987SSimon Horman return; 122c2a96987SSimon Horman 123c2a96987SSimon Horman if (host->dma->enable) 124c2a96987SSimon Horman host->dma->enable(host, enable); 125c2a96987SSimon Horman } 126c2a96987SSimon Horman 127c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_abort_dma(struct tmio_mmc_host *host) 128c2a96987SSimon Horman { 129c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, false); 130c2a96987SSimon Horman 131c2a96987SSimon Horman if (host->chan_rx) 132c2a96987SSimon Horman dmaengine_terminate_all(host->chan_rx); 133c2a96987SSimon Horman if (host->chan_tx) 134c2a96987SSimon Horman dmaengine_terminate_all(host->chan_tx); 135c2a96987SSimon Horman 136c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, true); 137c2a96987SSimon Horman } 138c2a96987SSimon Horman 13992d0f925SSimon Horman static void renesas_sdhi_sys_dmac_dataend_dma(struct tmio_mmc_host *host) 14092d0f925SSimon Horman { 14192d0f925SSimon Horman complete(&host->dma_dataend); 14292d0f925SSimon Horman } 14392d0f925SSimon Horman 144c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_dma_callback(void *arg) 145c2a96987SSimon Horman { 146c2a96987SSimon Horman struct tmio_mmc_host *host = arg; 147c2a96987SSimon Horman 148c2a96987SSimon Horman spin_lock_irq(&host->lock); 149c2a96987SSimon Horman 150c2a96987SSimon Horman if (!host->data) 151c2a96987SSimon Horman goto out; 152c2a96987SSimon Horman 153c2a96987SSimon Horman if (host->data->flags & MMC_DATA_READ) 154c2a96987SSimon Horman dma_unmap_sg(host->chan_rx->device->dev, 155c2a96987SSimon Horman host->sg_ptr, host->sg_len, 156c2a96987SSimon Horman DMA_FROM_DEVICE); 157c2a96987SSimon Horman else 158c2a96987SSimon Horman dma_unmap_sg(host->chan_tx->device->dev, 159c2a96987SSimon Horman host->sg_ptr, host->sg_len, 160c2a96987SSimon Horman DMA_TO_DEVICE); 161c2a96987SSimon Horman 162c2a96987SSimon Horman spin_unlock_irq(&host->lock); 163c2a96987SSimon Horman 164c2a96987SSimon Horman wait_for_completion(&host->dma_dataend); 165c2a96987SSimon Horman 166c2a96987SSimon Horman spin_lock_irq(&host->lock); 167c2a96987SSimon Horman tmio_mmc_do_data_irq(host); 168c2a96987SSimon Horman out: 169c2a96987SSimon Horman spin_unlock_irq(&host->lock); 170c2a96987SSimon Horman } 171c2a96987SSimon Horman 172c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host) 173c2a96987SSimon Horman { 174c2a96987SSimon Horman struct scatterlist *sg = host->sg_ptr, *sg_tmp; 175c2a96987SSimon Horman struct dma_async_tx_descriptor *desc = NULL; 176c2a96987SSimon Horman struct dma_chan *chan = host->chan_rx; 177c2a96987SSimon Horman dma_cookie_t cookie; 178c2a96987SSimon Horman int ret, i; 179c2a96987SSimon Horman bool aligned = true, multiple = true; 180c2a96987SSimon Horman unsigned int align = (1 << host->pdata->alignment_shift) - 1; 181c2a96987SSimon Horman 182c2a96987SSimon Horman for_each_sg(sg, sg_tmp, host->sg_len, i) { 183c2a96987SSimon Horman if (sg_tmp->offset & align) 184c2a96987SSimon Horman aligned = false; 185c2a96987SSimon Horman if (sg_tmp->length & align) { 186c2a96987SSimon Horman multiple = false; 187c2a96987SSimon Horman break; 188c2a96987SSimon Horman } 189c2a96987SSimon Horman } 190c2a96987SSimon Horman 191c2a96987SSimon Horman if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE || 192c2a96987SSimon Horman (align & PAGE_MASK))) || !multiple) { 193c2a96987SSimon Horman ret = -EINVAL; 194c2a96987SSimon Horman goto pio; 195c2a96987SSimon Horman } 196c2a96987SSimon Horman 197c2a96987SSimon Horman if (sg->length < TMIO_MMC_MIN_DMA_LEN) { 198c2a96987SSimon Horman host->force_pio = true; 199c2a96987SSimon Horman return; 200c2a96987SSimon Horman } 201c2a96987SSimon Horman 202c2a96987SSimon Horman tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_RXRDY); 203c2a96987SSimon Horman 204c2a96987SSimon Horman /* The only sg element can be unaligned, use our bounce buffer then */ 205c2a96987SSimon Horman if (!aligned) { 206c2a96987SSimon Horman sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length); 207c2a96987SSimon Horman host->sg_ptr = &host->bounce_sg; 208c2a96987SSimon Horman sg = host->sg_ptr; 209c2a96987SSimon Horman } 210c2a96987SSimon Horman 211c2a96987SSimon Horman ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE); 212c2a96987SSimon Horman if (ret > 0) 2132fe35968SSimon Horman desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_DEV_TO_MEM, 2142fe35968SSimon Horman DMA_CTRL_ACK); 215c2a96987SSimon Horman 216c2a96987SSimon Horman if (desc) { 217c2a96987SSimon Horman reinit_completion(&host->dma_dataend); 218c2a96987SSimon Horman desc->callback = renesas_sdhi_sys_dmac_dma_callback; 219c2a96987SSimon Horman desc->callback_param = host; 220c2a96987SSimon Horman 221c2a96987SSimon Horman cookie = dmaengine_submit(desc); 222c2a96987SSimon Horman if (cookie < 0) { 223c2a96987SSimon Horman desc = NULL; 224c2a96987SSimon Horman ret = cookie; 225c2a96987SSimon Horman } 226c2a96987SSimon Horman } 227c2a96987SSimon Horman pio: 228c2a96987SSimon Horman if (!desc) { 229c2a96987SSimon Horman /* DMA failed, fall back to PIO */ 230c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, false); 231c2a96987SSimon Horman if (ret >= 0) 232c2a96987SSimon Horman ret = -EIO; 233c2a96987SSimon Horman host->chan_rx = NULL; 234c2a96987SSimon Horman dma_release_channel(chan); 235c2a96987SSimon Horman /* Free the Tx channel too */ 236c2a96987SSimon Horman chan = host->chan_tx; 237c2a96987SSimon Horman if (chan) { 238c2a96987SSimon Horman host->chan_tx = NULL; 239c2a96987SSimon Horman dma_release_channel(chan); 240c2a96987SSimon Horman } 241c2a96987SSimon Horman dev_warn(&host->pdev->dev, 242c2a96987SSimon Horman "DMA failed: %d, falling back to PIO\n", ret); 243c2a96987SSimon Horman } 244c2a96987SSimon Horman } 245c2a96987SSimon Horman 246c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host) 247c2a96987SSimon Horman { 248c2a96987SSimon Horman struct scatterlist *sg = host->sg_ptr, *sg_tmp; 249c2a96987SSimon Horman struct dma_async_tx_descriptor *desc = NULL; 250c2a96987SSimon Horman struct dma_chan *chan = host->chan_tx; 251c2a96987SSimon Horman dma_cookie_t cookie; 252c2a96987SSimon Horman int ret, i; 253c2a96987SSimon Horman bool aligned = true, multiple = true; 254c2a96987SSimon Horman unsigned int align = (1 << host->pdata->alignment_shift) - 1; 255c2a96987SSimon Horman 256c2a96987SSimon Horman for_each_sg(sg, sg_tmp, host->sg_len, i) { 257c2a96987SSimon Horman if (sg_tmp->offset & align) 258c2a96987SSimon Horman aligned = false; 259c2a96987SSimon Horman if (sg_tmp->length & align) { 260c2a96987SSimon Horman multiple = false; 261c2a96987SSimon Horman break; 262c2a96987SSimon Horman } 263c2a96987SSimon Horman } 264c2a96987SSimon Horman 265c2a96987SSimon Horman if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE || 266c2a96987SSimon Horman (align & PAGE_MASK))) || !multiple) { 267c2a96987SSimon Horman ret = -EINVAL; 268c2a96987SSimon Horman goto pio; 269c2a96987SSimon Horman } 270c2a96987SSimon Horman 271c2a96987SSimon Horman if (sg->length < TMIO_MMC_MIN_DMA_LEN) { 272c2a96987SSimon Horman host->force_pio = true; 273c2a96987SSimon Horman return; 274c2a96987SSimon Horman } 275c2a96987SSimon Horman 276c2a96987SSimon Horman tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_TXRQ); 277c2a96987SSimon Horman 278c2a96987SSimon Horman /* The only sg element can be unaligned, use our bounce buffer then */ 279c2a96987SSimon Horman if (!aligned) { 280c2a96987SSimon Horman unsigned long flags; 281c2a96987SSimon Horman void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags); 2822fe35968SSimon Horman 283c2a96987SSimon Horman sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length); 284c2a96987SSimon Horman memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length); 285c2a96987SSimon Horman tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr); 286c2a96987SSimon Horman host->sg_ptr = &host->bounce_sg; 287c2a96987SSimon Horman sg = host->sg_ptr; 288c2a96987SSimon Horman } 289c2a96987SSimon Horman 290c2a96987SSimon Horman ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE); 291c2a96987SSimon Horman if (ret > 0) 2922fe35968SSimon Horman desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_MEM_TO_DEV, 2932fe35968SSimon Horman DMA_CTRL_ACK); 294c2a96987SSimon Horman 295c2a96987SSimon Horman if (desc) { 296c2a96987SSimon Horman reinit_completion(&host->dma_dataend); 297c2a96987SSimon Horman desc->callback = renesas_sdhi_sys_dmac_dma_callback; 298c2a96987SSimon Horman desc->callback_param = host; 299c2a96987SSimon Horman 300c2a96987SSimon Horman cookie = dmaengine_submit(desc); 301c2a96987SSimon Horman if (cookie < 0) { 302c2a96987SSimon Horman desc = NULL; 303c2a96987SSimon Horman ret = cookie; 304c2a96987SSimon Horman } 305c2a96987SSimon Horman } 306c2a96987SSimon Horman pio: 307c2a96987SSimon Horman if (!desc) { 308c2a96987SSimon Horman /* DMA failed, fall back to PIO */ 309c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, false); 310c2a96987SSimon Horman if (ret >= 0) 311c2a96987SSimon Horman ret = -EIO; 312c2a96987SSimon Horman host->chan_tx = NULL; 313c2a96987SSimon Horman dma_release_channel(chan); 314c2a96987SSimon Horman /* Free the Rx channel too */ 315c2a96987SSimon Horman chan = host->chan_rx; 316c2a96987SSimon Horman if (chan) { 317c2a96987SSimon Horman host->chan_rx = NULL; 318c2a96987SSimon Horman dma_release_channel(chan); 319c2a96987SSimon Horman } 320c2a96987SSimon Horman dev_warn(&host->pdev->dev, 321c2a96987SSimon Horman "DMA failed: %d, falling back to PIO\n", ret); 322c2a96987SSimon Horman } 323c2a96987SSimon Horman } 324c2a96987SSimon Horman 325c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host, 326c2a96987SSimon Horman struct mmc_data *data) 327c2a96987SSimon Horman { 328c2a96987SSimon Horman if (data->flags & MMC_DATA_READ) { 329c2a96987SSimon Horman if (host->chan_rx) 330c2a96987SSimon Horman renesas_sdhi_sys_dmac_start_dma_rx(host); 331c2a96987SSimon Horman } else { 332c2a96987SSimon Horman if (host->chan_tx) 333c2a96987SSimon Horman renesas_sdhi_sys_dmac_start_dma_tx(host); 334c2a96987SSimon Horman } 335c2a96987SSimon Horman } 336c2a96987SSimon Horman 337c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_issue_tasklet_fn(unsigned long priv) 338c2a96987SSimon Horman { 339c2a96987SSimon Horman struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv; 340c2a96987SSimon Horman struct dma_chan *chan = NULL; 341c2a96987SSimon Horman 342c2a96987SSimon Horman spin_lock_irq(&host->lock); 343c2a96987SSimon Horman 344c2a96987SSimon Horman if (host && host->data) { 345c2a96987SSimon Horman if (host->data->flags & MMC_DATA_READ) 346c2a96987SSimon Horman chan = host->chan_rx; 347c2a96987SSimon Horman else 348c2a96987SSimon Horman chan = host->chan_tx; 349c2a96987SSimon Horman } 350c2a96987SSimon Horman 351c2a96987SSimon Horman spin_unlock_irq(&host->lock); 352c2a96987SSimon Horman 353c2a96987SSimon Horman tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND); 354c2a96987SSimon Horman 355c2a96987SSimon Horman if (chan) 356c2a96987SSimon Horman dma_async_issue_pending(chan); 357c2a96987SSimon Horman } 358c2a96987SSimon Horman 359c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host, 360c2a96987SSimon Horman struct tmio_mmc_data *pdata) 361c2a96987SSimon Horman { 362c2a96987SSimon Horman /* We can only either use DMA for both Tx and Rx or not use it at all */ 3632487e7efSMasahiro Yamada if (!host->pdev->dev.of_node && 3642487e7efSMasahiro Yamada (!pdata->chan_priv_tx || !pdata->chan_priv_rx)) 365c2a96987SSimon Horman return; 366c2a96987SSimon Horman 367c2a96987SSimon Horman if (!host->chan_tx && !host->chan_rx) { 368c2a96987SSimon Horman struct resource *res = platform_get_resource(host->pdev, 369c2a96987SSimon Horman IORESOURCE_MEM, 0); 370c2a96987SSimon Horman struct dma_slave_config cfg = {}; 371c2a96987SSimon Horman dma_cap_mask_t mask; 372c2a96987SSimon Horman int ret; 373c2a96987SSimon Horman 374c2a96987SSimon Horman if (!res) 375c2a96987SSimon Horman return; 376c2a96987SSimon Horman 377c2a96987SSimon Horman dma_cap_zero(mask); 378c2a96987SSimon Horman dma_cap_set(DMA_SLAVE, mask); 379c2a96987SSimon Horman 380c2a96987SSimon Horman host->chan_tx = dma_request_slave_channel_compat(mask, 381c2a96987SSimon Horman host->dma->filter, pdata->chan_priv_tx, 382c2a96987SSimon Horman &host->pdev->dev, "tx"); 383c2a96987SSimon Horman dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__, 384c2a96987SSimon Horman host->chan_tx); 385c2a96987SSimon Horman 386c2a96987SSimon Horman if (!host->chan_tx) 387c2a96987SSimon Horman return; 388c2a96987SSimon Horman 389c2a96987SSimon Horman cfg.direction = DMA_MEM_TO_DEV; 3902fe35968SSimon Horman cfg.dst_addr = res->start + 3912fe35968SSimon Horman (CTL_SD_DATA_PORT << host->bus_shift); 392c2a96987SSimon Horman cfg.dst_addr_width = host->dma->dma_buswidth; 393c2a96987SSimon Horman if (!cfg.dst_addr_width) 394c2a96987SSimon Horman cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; 395c2a96987SSimon Horman cfg.src_addr = 0; 396c2a96987SSimon Horman ret = dmaengine_slave_config(host->chan_tx, &cfg); 397c2a96987SSimon Horman if (ret < 0) 398c2a96987SSimon Horman goto ecfgtx; 399c2a96987SSimon Horman 400c2a96987SSimon Horman host->chan_rx = dma_request_slave_channel_compat(mask, 401c2a96987SSimon Horman host->dma->filter, pdata->chan_priv_rx, 402c2a96987SSimon Horman &host->pdev->dev, "rx"); 403c2a96987SSimon Horman dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__, 404c2a96987SSimon Horman host->chan_rx); 405c2a96987SSimon Horman 406c2a96987SSimon Horman if (!host->chan_rx) 407c2a96987SSimon Horman goto ereqrx; 408c2a96987SSimon Horman 409c2a96987SSimon Horman cfg.direction = DMA_DEV_TO_MEM; 410c2a96987SSimon Horman cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset; 411c2a96987SSimon Horman cfg.src_addr_width = host->dma->dma_buswidth; 412c2a96987SSimon Horman if (!cfg.src_addr_width) 413c2a96987SSimon Horman cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; 414c2a96987SSimon Horman cfg.dst_addr = 0; 415c2a96987SSimon Horman ret = dmaengine_slave_config(host->chan_rx, &cfg); 416c2a96987SSimon Horman if (ret < 0) 417c2a96987SSimon Horman goto ecfgrx; 418c2a96987SSimon Horman 419c2a96987SSimon Horman host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA); 420c2a96987SSimon Horman if (!host->bounce_buf) 421c2a96987SSimon Horman goto ebouncebuf; 422c2a96987SSimon Horman 423c2a96987SSimon Horman init_completion(&host->dma_dataend); 424c2a96987SSimon Horman tasklet_init(&host->dma_issue, 425c2a96987SSimon Horman renesas_sdhi_sys_dmac_issue_tasklet_fn, 426c2a96987SSimon Horman (unsigned long)host); 427c2a96987SSimon Horman } 428c2a96987SSimon Horman 429c2a96987SSimon Horman renesas_sdhi_sys_dmac_enable_dma(host, true); 430c2a96987SSimon Horman 431c2a96987SSimon Horman return; 432c2a96987SSimon Horman 433c2a96987SSimon Horman ebouncebuf: 434c2a96987SSimon Horman ecfgrx: 435c2a96987SSimon Horman dma_release_channel(host->chan_rx); 436c2a96987SSimon Horman host->chan_rx = NULL; 437c2a96987SSimon Horman ereqrx: 438c2a96987SSimon Horman ecfgtx: 439c2a96987SSimon Horman dma_release_channel(host->chan_tx); 440c2a96987SSimon Horman host->chan_tx = NULL; 441c2a96987SSimon Horman } 442c2a96987SSimon Horman 443c2a96987SSimon Horman static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host) 444c2a96987SSimon Horman { 445c2a96987SSimon Horman if (host->chan_tx) { 446c2a96987SSimon Horman struct dma_chan *chan = host->chan_tx; 4472fe35968SSimon Horman 448c2a96987SSimon Horman host->chan_tx = NULL; 449c2a96987SSimon Horman dma_release_channel(chan); 450c2a96987SSimon Horman } 451c2a96987SSimon Horman if (host->chan_rx) { 452c2a96987SSimon Horman struct dma_chan *chan = host->chan_rx; 4532fe35968SSimon Horman 454c2a96987SSimon Horman host->chan_rx = NULL; 455c2a96987SSimon Horman dma_release_channel(chan); 456c2a96987SSimon Horman } 457c2a96987SSimon Horman if (host->bounce_buf) { 458c2a96987SSimon Horman free_pages((unsigned long)host->bounce_buf, 0); 459c2a96987SSimon Horman host->bounce_buf = NULL; 460c2a96987SSimon Horman } 461c2a96987SSimon Horman } 462c2a96987SSimon Horman 463c2a96987SSimon Horman static const struct tmio_mmc_dma_ops renesas_sdhi_sys_dmac_dma_ops = { 464c2a96987SSimon Horman .start = renesas_sdhi_sys_dmac_start_dma, 465c2a96987SSimon Horman .enable = renesas_sdhi_sys_dmac_enable_dma, 466c2a96987SSimon Horman .request = renesas_sdhi_sys_dmac_request_dma, 467c2a96987SSimon Horman .release = renesas_sdhi_sys_dmac_release_dma, 468c2a96987SSimon Horman .abort = renesas_sdhi_sys_dmac_abort_dma, 46992d0f925SSimon Horman .dataend = renesas_sdhi_sys_dmac_dataend_dma, 470c2a96987SSimon Horman }; 471c2a96987SSimon Horman 472cd09780fSSimon Horman /* 473cd09780fSSimon Horman * Whitelist of specific R-Car Gen3 SoC ES versions to use this DMAC 474cd09780fSSimon Horman * implementation. Currently empty as all supported ES versions use 475cd09780fSSimon Horman * the internal DMAC. 476cd09780fSSimon Horman */ 477cd09780fSSimon Horman static const struct soc_device_attribute gen3_soc_whitelist[] = { 478cd09780fSSimon Horman { /* sentinel */ } 479cd09780fSSimon Horman }; 480cd09780fSSimon Horman 4819d08428aSSimon Horman static int renesas_sdhi_sys_dmac_probe(struct platform_device *pdev) 482c2a96987SSimon Horman { 483cd09780fSSimon Horman if (of_device_get_match_data(&pdev->dev) == &of_rcar_gen3_compatible && 484cd09780fSSimon Horman !soc_device_match(gen3_soc_whitelist)) 485cd09780fSSimon Horman return -ENODEV; 486cd09780fSSimon Horman 4879d08428aSSimon Horman return renesas_sdhi_probe(pdev, &renesas_sdhi_sys_dmac_dma_ops); 488c2a96987SSimon Horman } 4899d08428aSSimon Horman 4909d08428aSSimon Horman static const struct dev_pm_ops renesas_sdhi_sys_dmac_dev_pm_ops = { 4919d08428aSSimon Horman SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 4929d08428aSSimon Horman pm_runtime_force_resume) 4939d08428aSSimon Horman SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend, 4949d08428aSSimon Horman tmio_mmc_host_runtime_resume, 4959d08428aSSimon Horman NULL) 4969d08428aSSimon Horman }; 4979d08428aSSimon Horman 4989d08428aSSimon Horman static struct platform_driver renesas_sys_dmac_sdhi_driver = { 4999d08428aSSimon Horman .driver = { 5009d08428aSSimon Horman .name = "sh_mobile_sdhi", 5019d08428aSSimon Horman .pm = &renesas_sdhi_sys_dmac_dev_pm_ops, 5029d08428aSSimon Horman .of_match_table = renesas_sdhi_sys_dmac_of_match, 5039d08428aSSimon Horman }, 5049d08428aSSimon Horman .probe = renesas_sdhi_sys_dmac_probe, 5059d08428aSSimon Horman .remove = renesas_sdhi_remove, 5069d08428aSSimon Horman }; 5079d08428aSSimon Horman 5089d08428aSSimon Horman module_platform_driver(renesas_sys_dmac_sdhi_driver); 5099d08428aSSimon Horman 5109d08428aSSimon Horman MODULE_DESCRIPTION("Renesas SDHI driver"); 5119d08428aSSimon Horman MODULE_AUTHOR("Magnus Damm"); 5129d08428aSSimon Horman MODULE_LICENSE("GPL v2"); 5139d08428aSSimon Horman MODULE_ALIAS("platform:sh_mobile_sdhi"); 514