mmc: sdhi: Add r8a7795 support

Registers are 64bit apart, so we refactor bus_shift handling a little and set
it based on the DT compatible. Also, EXT_ACC is different. It has been tested
on a Salvator-X (Gen3) and, to check for regressions, on a Lager (Gen2).

Signed-off-by: Ai Kyuse <ai.kyuse.uw@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
index 400b640..7fb746d 100644 (file)
--- a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt
@@ -22,6 +22,7 @@ Required properties:
                "renesas,sdhi-r8a7792" - SDHI IP on R8A7792 SoC
                "renesas,sdhi-r8a7793" - SDHI IP on R8A7793 SoC
                "renesas,sdhi-r8a7794" - SDHI IP on R8A7794 SoC
+               "renesas,sdhi-r8a7795" - SDHI IP on R8A7795 SoC
 
 Optional properties:
 - toshiba,mmc-wrprotect-disable: write-protect detection is unavailable

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 4a35ebf..d9a9d92 100644 (file)
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -560,7 +560,7 @@ config MMC_TMIO
 
 config MMC_SDHI
        tristate "SH-Mobile SDHI SD/SDIO controller support"
-       depends on SUPERH || ARM
+       depends on SUPERH || ARM || ARM64
        depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST
        select MMC_TMIO_CORE
        help

diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
index 557e2b9..9aa1479 100644 (file)
--- a/drivers/mmc/host/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -1,6 +1,8 @@
 /*
  * SuperH Mobile SDHI
  *
+ * Copyright (C) 2016 Sang Engineering, Wolfram Sang
+ * Copyright (C) 2015-16 Renesas Electronics Corporation
  * Copyright (C) 2009 Magnus Damm
  *
  * This program is free software; you can redistribute it and/or modify
@@ -43,6 +45,7 @@ struct sh_mobile_sdhi_of_data {
        unsigned long capabilities2;
        enum dma_slave_buswidth dma_buswidth;
        dma_addr_t dma_rx_offset;
+       unsigned bus_shift;
 };
 
 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
@@ -65,6 +68,13 @@ static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
        .dma_rx_offset  = 0x2000,
 };
 
+static const struct sh_mobile_sdhi_of_data of_rcar_gen3_compatible = {
+       .tmio_flags     = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
+                         TMIO_MMC_CLK_ACTUAL | TMIO_MMC_FAST_CLK_CHG,
+       .capabilities   = MMC_CAP_SD_HIGHSPEED,
+       .bus_shift      = 2,
+};
+
 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
        { .compatible = "renesas,sdhi-shmobile" },
        { .compatible = "renesas,sdhi-sh7372" },
@@ -78,6 +88,7 @@ static const struct of_device_id sh_mobile_sdhi_of_match[] = {
        { .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,sdhi-r8a7795", .data = &of_rcar_gen3_compatible, },
        {},
 };
 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
@@ -103,6 +114,15 @@ static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
        case 0xCB0D:
                val = (width == 32) ? 0x0000 : 0x0001;
                break;
+       case 0xCC10: /* Gen3, SD only */
+       case 0xCD10: /* Gen3, SD + MMC */
+               if (width == 64)
+                       val = 0x0000;
+               else if (width == 32)
+                       val = 0x0101;
+               else
+                       val = 0x0001;
+               break;
        default:
                /* nothing to do */
                return;
@@ -233,16 +253,26 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
                goto eprobe;
        }
 
+       if (of_id && of_id->data) {
+               const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
+
+               mmc_data->flags |= of_data->tmio_flags;
+               mmc_data->capabilities |= of_data->capabilities;
+               mmc_data->capabilities2 |= of_data->capabilities2;
+               mmc_data->dma_rx_offset = of_data->dma_rx_offset;
+               dma_priv->dma_buswidth = of_data->dma_buswidth;
+               host->bus_shift = of_data->bus_shift;
+       }
+
        host->dma               = dma_priv;
        host->write16_hook      = sh_mobile_sdhi_write16_hook;
        host->clk_enable        = sh_mobile_sdhi_clk_enable;
        host->clk_disable       = sh_mobile_sdhi_clk_disable;
        host->multi_io_quirk    = sh_mobile_sdhi_multi_io_quirk;
-       /* SD control register space size is 0x100, 0x200 for bus_shift=1 */
-       if (resource_size(res) > 0x100)
+
+       /* Orginally registers were 16 bit apart, could be 32 or 64 nowadays */
+       if (!host->bus_shift && resource_size(res) > 0x100) /* old way to determine the shift */
                host->bus_shift = 1;
-       else
-               host->bus_shift = 0;
 
        if (mmd)
                *mmc_data = *mmd;
@@ -274,15 +304,6 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
         */
        mmc_data->flags |= TMIO_MMC_SDIO_STATUS_QUIRK;
 
-       if (of_id && of_id->data) {
-               const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
-               mmc_data->flags |= of_data->tmio_flags;
-               mmc_data->capabilities |= of_data->capabilities;
-               mmc_data->capabilities2 |= of_data->capabilities2;
-               mmc_data->dma_rx_offset = of_data->dma_rx_offset;
-               dma_priv->dma_buswidth = of_data->dma_buswidth;
-       }
-
        ret = tmio_mmc_host_probe(host, mmc_data);
        if (ret < 0)
                goto efree;