// SPDX-License-Identifier: GPL-2.0 /* * DMA support for Internal DMAC with SDHI SD/SDIO controller * * Copyright (C) 2016-19 Renesas Electronics Corporation * Copyright (C) 2016-17 Horms Solutions, Simon Horman * Copyright (C) 2018-19 Sang Engineering, Wolfram Sang */ #include <linux/bitops.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/io-64-nonatomic-hi-lo.h> #include <linux/mmc/host.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/of.h> #include <linux/pagemap.h> #include <linux/platform_data/tmio.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/scatterlist.h> #include <linux/sys_soc.h> #include "renesas_sdhi.h" #include "tmio_mmc.h" #define DM_CM_DTRAN_MODE … #define DM_CM_DTRAN_CTRL … #define DM_CM_RST … #define DM_CM_INFO1 … #define DM_CM_INFO1_MASK … #define DM_CM_INFO2 … #define DM_CM_INFO2_MASK … #define DM_DTRAN_ADDR … /* DM_CM_DTRAN_MODE */ #define DTRAN_MODE_CH_NUM_CH0 … #define DTRAN_MODE_CH_NUM_CH1 … #define DTRAN_MODE_BUS_WIDTH … #define DTRAN_MODE_ADDR_MODE … /* DM_CM_DTRAN_CTRL */ #define DTRAN_CTRL_DM_START … /* DM_CM_RST */ #define RST_DTRANRST1 … #define RST_DTRANRST0 … #define RST_RESERVED_BITS … /* DM_CM_INFO1 and DM_CM_INFO1_MASK */ #define INFO1_MASK_CLEAR … #define INFO1_DTRANEND1 … #define INFO1_DTRANEND1_OLD … #define INFO1_DTRANEND0 … /* DM_CM_INFO2 and DM_CM_INFO2_MASK */ #define INFO2_MASK_CLEAR … #define INFO2_DTRANERR1 … #define INFO2_DTRANERR0 … enum renesas_sdhi_dma_cookie { … }; /* * 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 M3-W * ES1.0, when multiple SDHI channels use RX DMAC simultaneously, sometimes * hundreds of data bytes 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_RX_IN_USE … /* Definitions for sampling clocks */ static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = …; static const struct renesas_sdhi_of_data of_data_rza2 = …; static const struct renesas_sdhi_of_data of_data_rcar_gen3 = …; static const struct renesas_sdhi_of_data of_data_rcar_gen3_no_sdh_fallback = …; static const u8 r8a7796_es13_calib_table[2][SDHI_CALIB_TABLE_MAX] = …; static const u8 r8a77965_calib_table[2][SDHI_CALIB_TABLE_MAX] = …; static const u8 r8a77990_calib_table[2][SDHI_CALIB_TABLE_MAX] = …; static const struct renesas_sdhi_quirks sdhi_quirks_4tap_nohs400 = …; static const struct renesas_sdhi_quirks sdhi_quirks_4tap_nohs400_one_rx = …; static const struct renesas_sdhi_quirks sdhi_quirks_4tap = …; static const struct renesas_sdhi_quirks sdhi_quirks_nohs400 = …; static const struct renesas_sdhi_quirks sdhi_quirks_fixed_addr = …; static const struct renesas_sdhi_quirks sdhi_quirks_bad_taps1357 = …; static const struct renesas_sdhi_quirks sdhi_quirks_bad_taps2367 = …; static const struct renesas_sdhi_quirks sdhi_quirks_r8a7796_es13 = …; static const struct renesas_sdhi_quirks sdhi_quirks_r8a77965 = …; static const struct renesas_sdhi_quirks sdhi_quirks_r8a77990 = …; static const struct renesas_sdhi_quirks sdhi_quirks_rzg2l = …; /* * Note for r8a7796 / r8a774a1: we can't distinguish ES1.1 and 1.2 as of now. * So, we want to treat them equally and only have a match for ES1.2 to enforce * this if there ever will be a way to distinguish ES1.2. */ static const struct soc_device_attribute sdhi_quirks_match[] = …; static const struct renesas_sdhi_of_data_with_quirks of_r8a7795_compatible = …; static const struct renesas_sdhi_of_data_with_quirks of_r8a77961_compatible = …; static const struct renesas_sdhi_of_data_with_quirks of_r8a77965_compatible = …; static const struct renesas_sdhi_of_data_with_quirks of_r8a77970_compatible = …; static const struct renesas_sdhi_of_data_with_quirks of_r8a77990_compatible = …; static const struct renesas_sdhi_of_data_with_quirks of_rzg2l_compatible = …; static const struct renesas_sdhi_of_data_with_quirks of_rcar_gen3_compatible = …; static const struct renesas_sdhi_of_data_with_quirks of_rcar_gen3_nohs400_compatible = …; static const struct renesas_sdhi_of_data_with_quirks of_rza2_compatible = …; static const struct of_device_id renesas_sdhi_internal_dmac_of_match[] = …; MODULE_DEVICE_TABLE(of, renesas_sdhi_internal_dmac_of_match); static void renesas_sdhi_internal_dmac_enable_dma(struct tmio_mmc_host *host, bool enable) { … } static void renesas_sdhi_internal_dmac_abort_dma(struct tmio_mmc_host *host) { … } static bool renesas_sdhi_internal_dmac_dma_irq(struct tmio_mmc_host *host) { … } static void renesas_sdhi_internal_dmac_dataend_dma(struct tmio_mmc_host *host) { … } /* * renesas_sdhi_internal_dmac_map() will be called with two different * sg pointers in two mmc_data by .pre_req(), but tmio host can have a single * sg_ptr only. So, renesas_sdhi_internal_dmac_{un}map() should use a sg * pointer in a mmc_data instead of host->sg_ptr. */ static void renesas_sdhi_internal_dmac_unmap(struct tmio_mmc_host *host, struct mmc_data *data, enum renesas_sdhi_dma_cookie cookie) { … } static bool renesas_sdhi_internal_dmac_map(struct tmio_mmc_host *host, struct mmc_data *data, enum renesas_sdhi_dma_cookie cookie) { … } static void renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host, struct mmc_data *data) { … } static void renesas_sdhi_internal_dmac_issue_work_fn(struct work_struct *work) { … } static bool renesas_sdhi_internal_dmac_complete(struct tmio_mmc_host *host) { … } static void renesas_sdhi_internal_dmac_complete_work_fn(struct work_struct *work) { … } static void renesas_sdhi_internal_dmac_end_dma(struct tmio_mmc_host *host) { … } static void renesas_sdhi_internal_dmac_post_req(struct mmc_host *mmc, struct mmc_request *mrq, int err) { … } static void renesas_sdhi_internal_dmac_pre_req(struct mmc_host *mmc, struct mmc_request *mrq) { … } static void renesas_sdhi_internal_dmac_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata) { … } static void renesas_sdhi_internal_dmac_release_dma(struct tmio_mmc_host *host) { … } static const struct tmio_mmc_dma_ops renesas_sdhi_internal_dmac_dma_ops = …; static int renesas_sdhi_internal_dmac_probe(struct platform_device *pdev) { … } static const struct dev_pm_ops renesas_sdhi_internal_dmac_dev_pm_ops = …; static struct platform_driver renesas_internal_dmac_sdhi_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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