/* * DMA support for Internal DMAC with SDHI SD/SDIO controller * * Copyright (C) 2016-17 Renesas Electronics Corporation * Copyright (C) 2016-17 Horms Solutions, Simon Horman * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include "renesas_sdhi.h" #include "tmio_mmc.h" #define DM_CM_DTRAN_MODE 0x820 #define DM_CM_DTRAN_CTRL 0x828 #define DM_CM_RST 0x830 #define DM_CM_INFO1 0x840 #define DM_CM_INFO1_MASK 0x848 #define DM_CM_INFO2 0x850 #define DM_CM_INFO2_MASK 0x858 #define DM_DTRAN_ADDR 0x880 /* DM_CM_DTRAN_MODE */ #define DTRAN_MODE_CH_NUM_CH0 0 /* "downstream" = for write commands */ #define DTRAN_MODE_CH_NUM_CH1 BIT(16) /* "uptream" = for read commands */ #define DTRAN_MODE_BUS_WID_TH (BIT(5) | BIT(4)) #define DTRAN_MODE_ADDR_MODE BIT(0) /* 1 = Increment address */ /* DM_CM_DTRAN_CTRL */ #define DTRAN_CTRL_DM_START BIT(0) /* DM_CM_RST */ #define RST_DTRANRST1 BIT(9) #define RST_DTRANRST0 BIT(8) #define RST_RESERVED_BITS GENMASK_ULL(31, 0) /* DM_CM_INFO1 and DM_CM_INFO1_MASK */ #define INFO1_CLEAR 0 #define INFO1_MASK_CLEAR GENMASK_ULL(31, 0) #define INFO1_DTRANEND1 BIT(17) #define INFO1_DTRANEND0 BIT(16) /* DM_CM_INFO2 and DM_CM_INFO2_MASK */ #define INFO2_MASK_CLEAR GENMASK_ULL(31, 0) #define INFO2_DTRANERR1 BIT(17) #define INFO2_DTRANERR0 BIT(16) /* * Specification of this driver: * - host->chan_{rx,tx} will be used as a flag of enabling/disabling the dma * - Since this SDHI DMAC register set has 16 but 32-bit width, we * need a custom accessor. */ static unsigned long global_flags; /* * Workaround for avoiding to use RX DMAC by multiple channels. * On R-Car H3 ES1.* and M3-W ES1.0, when multiple SDHI channels use * RX DMAC simultaneously, sometimes hundreds of bytes data are not * stored into the system memory even if the DMAC interrupt happened. * So, this driver then uses one RX DMAC channel only. */ #define SDHI_INTERNAL_DMAC_ONE_RX_ONLY 0 #define SDHI_INTERNAL_DMAC_RX_IN_USE 1 /* Definitions for sampling clocks */ static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = { { .clk_rate = 0, .tap = 0x00000300, .tap_hs400 = 0x00000704, }, }; static const struct renesas_sdhi_of_data of_rcar_r8a7795_compatible = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL | TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2 | TMIO_MMC_HAVE_4TAP_HS400, .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ | MMC_CAP_CMD23, .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT, .bus_shift = 2, .scc_offset = 0x1000, .taps = rcar_gen3_scc_taps, .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps), /* DMAC can handle 32bit blk count but only 1 segment */ .max_blk_count = UINT_MAX / TMIO_MAX_BLK_SIZE, .max_segs = 1, }; static const struct renesas_sdhi_of_data of_rcar_gen3_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, .bus_shift = 2, .scc_offset = 0x1000, .taps = rcar_gen3_scc_taps, .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps), /* DMAC can handle 32bit blk count but only 1 segment */ .max_blk_count = UINT_MAX / TMIO_MAX_BLK_SIZE, .max_segs = 1, }; static const struct of_device_id renesas_sdhi_internal_dmac_of_match[] = { { .compatible = "renesas,sdhi-r8a7795", .data = &of_rcar_r8a7795_compatible, }, { .compatible = "renesas,sdhi-r8a7796", .data = &of_rcar_r8a7795_compatible, }, { .compatible = "renesas,rcar-gen3-sdhi", .data = &of_rcar_gen3_compatible, }, {}, }; MODULE_DEVICE_TABLE(of, renesas_sdhi_internal_dmac_of_match); static void renesas_sdhi_internal_dmac_dm_write(struct tmio_mmc_host *host, int addr, u64 val) { writeq(val, host->ctl + addr); } static void renesas_sdhi_internal_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 (!enable) renesas_sdhi_internal_dmac_dm_write(host, DM_CM_INFO1, INFO1_CLEAR); if (priv->dma_priv.enable) priv->dma_priv.enable(host, enable); } static void renesas_sdhi_internal_dmac_abort_dma(struct tmio_mmc_host *host) { u64 val = RST_DTRANRST1 | RST_DTRANRST0; renesas_sdhi_internal_dmac_enable_dma(host, false); renesas_sdhi_internal_dmac_dm_write(host, DM_CM_RST, RST_RESERVED_BITS & ~val); renesas_sdhi_internal_dmac_dm_write(host, DM_CM_RST, RST_RESERVED_BITS | val); clear_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags); renesas_sdhi_internal_dmac_enable_dma(host, true); } static void renesas_sdhi_internal_dmac_dataend_dma(struct tmio_mmc_host *host) { struct renesas_sdhi *priv = host_to_priv(host); tasklet_schedule(&priv->dma_priv.dma_complete); } static void renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host, struct mmc_data *data) { struct scatterlist *sg = host->sg_ptr; u32 dtran_mode = DTRAN_MODE_BUS_WID_TH | DTRAN_MODE_ADDR_MODE; if (!dma_map_sg(&host->pdev->dev, sg, host->sg_len, mmc_get_dma_dir(data))) goto force_pio; /* This DMAC cannot handle if buffer is not 8-bytes alignment */ if (!IS_ALIGNED(sg_dma_address(sg), 8)) goto force_pio_with_unmap; if (data->flags & MMC_DATA_READ) { dtran_mode |= DTRAN_MODE_CH_NUM_CH1; if (test_bit(SDHI_INTERNAL_DMAC_ONE_RX_ONLY, &global_flags) && test_and_set_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags)) goto force_pio_with_unmap; } else { dtran_mode |= DTRAN_MODE_CH_NUM_CH0; } renesas_sdhi_internal_dmac_enable_dma(host, true); /* set dma parameters */ renesas_sdhi_internal_dmac_dm_write(host, DM_CM_DTRAN_MODE, dtran_mode); renesas_sdhi_internal_dmac_dm_write(host, DM_DTRAN_ADDR, sg_dma_address(sg)); return; force_pio_with_unmap: dma_unmap_sg(&host->pdev->dev, sg, host->sg_len, mmc_get_dma_dir(data)); force_pio: host->force_pio = true; renesas_sdhi_internal_dmac_enable_dma(host, false); } static void renesas_sdhi_internal_dmac_issue_tasklet_fn(unsigned long arg) { struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg; tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND); /* start the DMAC */ renesas_sdhi_internal_dmac_dm_write(host, DM_CM_DTRAN_CTRL, DTRAN_CTRL_DM_START); } static void renesas_sdhi_internal_dmac_complete_tasklet_fn(unsigned long arg) { struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg; enum dma_data_direction dir; spin_lock_irq(&host->lock); if (!host->data) goto out; if (host->data->flags & MMC_DATA_READ) dir = DMA_FROM_DEVICE; else dir = DMA_TO_DEVICE; renesas_sdhi_internal_dmac_enable_dma(host, false); dma_unmap_sg(&host->pdev->dev, host->sg_ptr, host->sg_len, dir); if (dir == DMA_FROM_DEVICE) clear_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags); tmio_mmc_do_data_irq(host); out: spin_unlock_irq(&host->lock); } static void renesas_sdhi_internal_dmac_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata) { struct renesas_sdhi *priv = host_to_priv(host); /* Disable DMAC interrupts, we don't use them */ renesas_sdhi_internal_dmac_dm_write(host, DM_CM_INFO1_MASK, INFO1_MASK_CLEAR); renesas_sdhi_internal_dmac_dm_write(host, DM_CM_INFO2_MASK, INFO2_MASK_CLEAR); /* Each value is set to non-zero to assume "enabling" each DMA */ host->chan_rx = host->chan_tx = (void *)0xdeadbeaf; tasklet_init(&priv->dma_priv.dma_complete, renesas_sdhi_internal_dmac_complete_tasklet_fn, (unsigned long)host); tasklet_init(&host->dma_issue, renesas_sdhi_internal_dmac_issue_tasklet_fn, (unsigned long)host); } static void renesas_sdhi_internal_dmac_release_dma(struct tmio_mmc_host *host) { /* Each value is set to zero to assume "disabling" each DMA */ host->chan_rx = host->chan_tx = NULL; } static const struct tmio_mmc_dma_ops renesas_sdhi_internal_dmac_dma_ops = { .start = renesas_sdhi_internal_dmac_start_dma, .enable = renesas_sdhi_internal_dmac_enable_dma, .request = renesas_sdhi_internal_dmac_request_dma, .release = renesas_sdhi_internal_dmac_release_dma, .abort = renesas_sdhi_internal_dmac_abort_dma, .dataend = renesas_sdhi_internal_dmac_dataend_dma, }; /* * Whitelist of specific R-Car Gen3 SoC ES versions to use this DMAC * implementation as others may use a different implementation. */ static const struct soc_device_attribute gen3_soc_whitelist[] = { /* specific ones */ { .soc_id = "r8a7795", .revision = "ES1.*", .data = (void *)BIT(SDHI_INTERNAL_DMAC_ONE_RX_ONLY) }, { .soc_id = "r8a7796", .revision = "ES1.0", .data = (void *)BIT(SDHI_INTERNAL_DMAC_ONE_RX_ONLY) }, /* generic ones */ { .soc_id = "r8a774a1" }, { .soc_id = "r8a774c0" }, { .soc_id = "r8a7795" }, { .soc_id = "r8a7796" }, { .soc_id = "r8a77965" }, { .soc_id = "r8a77980" }, { .soc_id = "r8a77995" }, { /* sentinel */ } }; static int renesas_sdhi_internal_dmac_probe(struct platform_device *pdev) { const struct soc_device_attribute *soc = soc_device_match(gen3_soc_whitelist); struct device *dev = &pdev->dev; if (!soc) return -ENODEV; global_flags |= (unsigned long)soc->data; dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), GFP_KERNEL); if (!dev->dma_parms) return -ENOMEM; /* value is max of SD_SECCNT. Confirmed by HW engineers */ dma_set_max_seg_size(dev, 0xffffffff); return renesas_sdhi_probe(pdev, &renesas_sdhi_internal_dmac_dma_ops); } static const struct dev_pm_ops renesas_sdhi_internal_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_internal_dmac_sdhi_driver = { .driver = { .name = "renesas_sdhi_internal_dmac", .pm = &renesas_sdhi_internal_dmac_dev_pm_ops, .of_match_table = renesas_sdhi_internal_dmac_of_match, }, .probe = renesas_sdhi_internal_dmac_probe, .remove = renesas_sdhi_remove, }; module_platform_driver(renesas_internal_dmac_sdhi_driver); MODULE_DESCRIPTION("Renesas SDHI driver for internal DMAC"); MODULE_AUTHOR("Yoshihiro Shimoda"); MODULE_LICENSE("GPL v2");