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- // 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 <linux/device.h>
- #include <linux/dma-mapping.h>
- #include <linux/dmaengine.h>
- #include <linux/mfd/tmio.h>
- #include <linux/mmc/host.h>
- #include <linux/mod_devicetable.h>
- #include <linux/module.h>
- #include <linux/of_device.h>
- #include <linux/pagemap.h>
- #include <linux/scatterlist.h>
- #include <linux/sys_soc.h>
- #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,
- };
- 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,
- .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,
- .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_all(host->chan_rx);
- if (host->chan_tx)
- dmaengine_terminate_all(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 << host->pdata->alignment_shift) - 1;
- 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 << host->pdata->alignment_shift) - 1;
- 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) {
- unsigned long flags;
- void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags);
- sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
- memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length);
- tmio_mmc_kunmap_atomic(sg, &flags, 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_tasklet_fn(unsigned long priv)
- {
- struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
- 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);
- tasklet_init(&host->dma_issue,
- renesas_sdhi_sys_dmac_issue_tasklet_fn,
- (unsigned long)host);
- }
- 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);
- }
- 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");
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