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