// SPDX-License-Identifier: GPL-2.0 /* * DMA support use of SYS DMAC with SDHI SD/SDIO controller * * Copyright (C) 2016-19 Renesas Electronics Corporation * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang * Copyright (C) 2017 Horms Solutions, Simon Horman * Copyright (C) 2010-2011 Guennadi Liakhovetski */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "renesas_sdhi.h" #include "tmio_mmc.h" #define TMIO_MMC_MIN_DMA_LEN 8 static const struct renesas_sdhi_of_data of_default_cfg = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT, }; static const struct renesas_sdhi_of_data of_rz_compatible = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_32BIT_DATA_PORT | TMIO_MMC_HAVE_CBSY, .tmio_ocr_mask = MMC_VDD_32_33, .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | MMC_CAP_WAIT_WHILE_BUSY, }; static const struct renesas_sdhi_of_data of_rcar_gen1_compatible = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL, .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | MMC_CAP_WAIT_WHILE_BUSY, .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT, }; /* Definitions for sampling clocks */ static struct renesas_sdhi_scc rcar_gen2_scc_taps[] = { { .clk_rate = 156000000, .tap = 0x00000703, }, { .clk_rate = 0, .tap = 0x00000300, }, }; static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL | TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2, .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY, .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT, .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES, .dma_rx_offset = 0x2000, .scc_offset = 0x0300, .taps = rcar_gen2_scc_taps, .taps_num = ARRAY_SIZE(rcar_gen2_scc_taps), .max_blk_count = UINT_MAX / TMIO_MAX_BLK_SIZE, }; static const struct of_device_id renesas_sdhi_sys_dmac_of_match[] = { { .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, }, { .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, }, { .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, }, { .compatible = "renesas,sdhi-r7s72100", .data = &of_rz_compatible, }, { .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, }, { .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, }, { .compatible = "renesas,sdhi-r8a7743", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7745", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,rcar-gen1-sdhi", .data = &of_rcar_gen1_compatible, }, { .compatible = "renesas,rcar-gen2-sdhi", .data = &of_rcar_gen2_compatible, }, { .compatible = "renesas,sdhi-shmobile" }, {}, }; MODULE_DEVICE_TABLE(of, renesas_sdhi_sys_dmac_of_match); static void renesas_sdhi_sys_dmac_enable_dma(struct tmio_mmc_host *host, bool enable) { struct renesas_sdhi *priv = host_to_priv(host); if (!host->chan_tx || !host->chan_rx) return; if (priv->dma_priv.enable) priv->dma_priv.enable(host, enable); } static void renesas_sdhi_sys_dmac_abort_dma(struct tmio_mmc_host *host) { renesas_sdhi_sys_dmac_enable_dma(host, false); if (host->chan_rx) dmaengine_terminate_sync(host->chan_rx); if (host->chan_tx) dmaengine_terminate_sync(host->chan_tx); renesas_sdhi_sys_dmac_enable_dma(host, true); } static void renesas_sdhi_sys_dmac_dataend_dma(struct tmio_mmc_host *host) { struct renesas_sdhi *priv = host_to_priv(host); complete(&priv->dma_priv.dma_dataend); } static void renesas_sdhi_sys_dmac_dma_callback(void *arg) { struct tmio_mmc_host *host = arg; struct renesas_sdhi *priv = host_to_priv(host); spin_lock_irq(&host->lock); if (!host->data) goto out; if (host->data->flags & MMC_DATA_READ) dma_unmap_sg(host->chan_rx->device->dev, host->sg_ptr, host->sg_len, DMA_FROM_DEVICE); else dma_unmap_sg(host->chan_tx->device->dev, host->sg_ptr, host->sg_len, DMA_TO_DEVICE); spin_unlock_irq(&host->lock); wait_for_completion(&priv->dma_priv.dma_dataend); spin_lock_irq(&host->lock); tmio_mmc_do_data_irq(host); out: spin_unlock_irq(&host->lock); } static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host) { struct renesas_sdhi *priv = host_to_priv(host); struct scatterlist *sg = host->sg_ptr, *sg_tmp; struct dma_async_tx_descriptor *desc = NULL; struct dma_chan *chan = host->chan_rx; dma_cookie_t cookie; int ret, i; bool aligned = true, multiple = true; unsigned int align = 1; /* 2-byte alignment */ for_each_sg(sg, sg_tmp, host->sg_len, i) { if (sg_tmp->offset & align) aligned = false; if (sg_tmp->length & align) { multiple = false; break; } } if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE || (align & PAGE_MASK))) || !multiple) { ret = -EINVAL; goto pio; } if (sg->length < TMIO_MMC_MIN_DMA_LEN) return; /* The only sg element can be unaligned, use our bounce buffer then */ if (!aligned) { sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length); host->sg_ptr = &host->bounce_sg; sg = host->sg_ptr; } ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE); if (ret > 0) desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_DEV_TO_MEM, DMA_CTRL_ACK); if (desc) { reinit_completion(&priv->dma_priv.dma_dataend); desc->callback = renesas_sdhi_sys_dmac_dma_callback; desc->callback_param = host; cookie = dmaengine_submit(desc); if (cookie < 0) { desc = NULL; ret = cookie; } host->dma_on = true; } pio: if (!desc) { /* DMA failed, fall back to PIO */ renesas_sdhi_sys_dmac_enable_dma(host, false); if (ret >= 0) ret = -EIO; host->chan_rx = NULL; dma_release_channel(chan); /* Free the Tx channel too */ chan = host->chan_tx; if (chan) { host->chan_tx = NULL; dma_release_channel(chan); } dev_warn(&host->pdev->dev, "DMA failed: %d, falling back to PIO\n", ret); } } static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host) { struct renesas_sdhi *priv = host_to_priv(host); struct scatterlist *sg = host->sg_ptr, *sg_tmp; struct dma_async_tx_descriptor *desc = NULL; struct dma_chan *chan = host->chan_tx; dma_cookie_t cookie; int ret, i; bool aligned = true, multiple = true; unsigned int align = 1; /* 2-byte alignment */ for_each_sg(sg, sg_tmp, host->sg_len, i) { if (sg_tmp->offset & align) aligned = false; if (sg_tmp->length & align) { multiple = false; break; } } if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE || (align & PAGE_MASK))) || !multiple) { ret = -EINVAL; goto pio; } if (sg->length < TMIO_MMC_MIN_DMA_LEN) return; /* The only sg element can be unaligned, use our bounce buffer then */ if (!aligned) { void *sg_vaddr = kmap_local_page(sg_page(sg)); sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length); memcpy(host->bounce_buf, sg_vaddr + sg->offset, host->bounce_sg.length); kunmap_local(sg_vaddr); host->sg_ptr = &host->bounce_sg; sg = host->sg_ptr; } ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE); if (ret > 0) desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_MEM_TO_DEV, DMA_CTRL_ACK); if (desc) { reinit_completion(&priv->dma_priv.dma_dataend); desc->callback = renesas_sdhi_sys_dmac_dma_callback; desc->callback_param = host; cookie = dmaengine_submit(desc); if (cookie < 0) { desc = NULL; ret = cookie; } host->dma_on = true; } pio: if (!desc) { /* DMA failed, fall back to PIO */ renesas_sdhi_sys_dmac_enable_dma(host, false); if (ret >= 0) ret = -EIO; host->chan_tx = NULL; dma_release_channel(chan); /* Free the Rx channel too */ chan = host->chan_rx; if (chan) { host->chan_rx = NULL; dma_release_channel(chan); } dev_warn(&host->pdev->dev, "DMA failed: %d, falling back to PIO\n", ret); } } static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host, struct mmc_data *data) { if (data->flags & MMC_DATA_READ) { if (host->chan_rx) renesas_sdhi_sys_dmac_start_dma_rx(host); } else { if (host->chan_tx) renesas_sdhi_sys_dmac_start_dma_tx(host); } } static void renesas_sdhi_sys_dmac_issue_work_fn(struct work_struct *work) { struct tmio_mmc_host *host = from_work(host, work, dma_issue); struct dma_chan *chan = NULL; spin_lock_irq(&host->lock); if (host->data) { if (host->data->flags & MMC_DATA_READ) chan = host->chan_rx; else chan = host->chan_tx; } spin_unlock_irq(&host->lock); tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND); if (chan) dma_async_issue_pending(chan); } static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata) { struct renesas_sdhi *priv = host_to_priv(host); /* We can only either use DMA for both Tx and Rx or not use it at all */ if (!host->pdev->dev.of_node && (!pdata->chan_priv_tx || !pdata->chan_priv_rx)) return; if (!host->chan_tx && !host->chan_rx) { struct resource *res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0); struct dma_slave_config cfg = {}; dma_cap_mask_t mask; int ret; if (!res) return; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); host->chan_tx = dma_request_slave_channel_compat(mask, priv->dma_priv.filter, pdata->chan_priv_tx, &host->pdev->dev, "tx"); dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__, host->chan_tx); if (!host->chan_tx) return; cfg.direction = DMA_MEM_TO_DEV; cfg.dst_addr = res->start + (CTL_SD_DATA_PORT << host->bus_shift); cfg.dst_addr_width = priv->dma_priv.dma_buswidth; if (!cfg.dst_addr_width) cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; cfg.src_addr = 0; ret = dmaengine_slave_config(host->chan_tx, &cfg); if (ret < 0) goto ecfgtx; host->chan_rx = dma_request_slave_channel_compat(mask, priv->dma_priv.filter, pdata->chan_priv_rx, &host->pdev->dev, "rx"); dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__, host->chan_rx); if (!host->chan_rx) goto ereqrx; cfg.direction = DMA_DEV_TO_MEM; cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset; cfg.src_addr_width = priv->dma_priv.dma_buswidth; if (!cfg.src_addr_width) cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; cfg.dst_addr = 0; ret = dmaengine_slave_config(host->chan_rx, &cfg); if (ret < 0) goto ecfgrx; host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA); if (!host->bounce_buf) goto ebouncebuf; init_completion(&priv->dma_priv.dma_dataend); INIT_WORK(&host->dma_issue, renesas_sdhi_sys_dmac_issue_work_fn); } renesas_sdhi_sys_dmac_enable_dma(host, true); return; ebouncebuf: ecfgrx: dma_release_channel(host->chan_rx); host->chan_rx = NULL; ereqrx: ecfgtx: dma_release_channel(host->chan_tx); host->chan_tx = NULL; } static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host) { if (host->chan_tx) { struct dma_chan *chan = host->chan_tx; host->chan_tx = NULL; dma_release_channel(chan); } if (host->chan_rx) { struct dma_chan *chan = host->chan_rx; host->chan_rx = NULL; dma_release_channel(chan); } if (host->bounce_buf) { free_pages((unsigned long)host->bounce_buf, 0); host->bounce_buf = NULL; } } static const struct tmio_mmc_dma_ops renesas_sdhi_sys_dmac_dma_ops = { .start = renesas_sdhi_sys_dmac_start_dma, .enable = renesas_sdhi_sys_dmac_enable_dma, .request = renesas_sdhi_sys_dmac_request_dma, .release = renesas_sdhi_sys_dmac_release_dma, .abort = renesas_sdhi_sys_dmac_abort_dma, .dataend = renesas_sdhi_sys_dmac_dataend_dma, }; static int renesas_sdhi_sys_dmac_probe(struct platform_device *pdev) { return renesas_sdhi_probe(pdev, &renesas_sdhi_sys_dmac_dma_ops, of_device_get_match_data(&pdev->dev), NULL); } static const struct dev_pm_ops renesas_sdhi_sys_dmac_dev_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume) SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend, tmio_mmc_host_runtime_resume, NULL) }; static struct platform_driver renesas_sys_dmac_sdhi_driver = { .driver = { .name = "sh_mobile_sdhi", .probe_type = PROBE_PREFER_ASYNCHRONOUS, .pm = &renesas_sdhi_sys_dmac_dev_pm_ops, .of_match_table = renesas_sdhi_sys_dmac_of_match, }, .probe = renesas_sdhi_sys_dmac_probe, .remove = renesas_sdhi_remove, }; module_platform_driver(renesas_sys_dmac_sdhi_driver); MODULE_DESCRIPTION("Renesas SDHI driver"); MODULE_AUTHOR("Magnus Damm"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:sh_mobile_sdhi");