target/linux/ipq806x/patches/0047-mmc-sdhci-msm-Initial-support-for-Qualcomm-chipsets.patch

   1 From 5a8f026acb4a7a6c6d0c868cc1790363640b9b8f Mon Sep 17 00:00:00 2001
   2 From: Georgi Djakov <gdjakov@mm-sol.com>
   3 Date: Mon, 10 Mar 2014 17:37:12 +0200
   4 Subject: [PATCH 047/182] mmc: sdhci-msm: Initial support for Qualcomm
   5  chipsets
   6
   7 This platform driver adds the initial support of Secure Digital Host
   8 Controller Interface compliant controller found in Qualcomm chipsets.
   9
  10 Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
  11 Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
  12 Tested-by: Ivan T. Ivanov <iivanov@mm-sol.com>
  13 Signed-off-by: Georgi Djakov <gdjakov@mm-sol.com>
  14 Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
  15 Signed-off-by: Chris Ball <chris@printf.net>
  16 ---
  17  drivers/mmc/host/Kconfig     |   13 +++
  18  drivers/mmc/host/Makefile    |    1 +
  19  drivers/mmc/host/sdhci-msm.c |  208 ++++++++++++++++++++++++++++++++++++++++++
  20  3 files changed, 222 insertions(+)
  21  create mode 100644 drivers/mmc/host/sdhci-msm.c
  22
  23 --- a/drivers/mmc/host/Kconfig
  24 +++ b/drivers/mmc/host/Kconfig
  25 @@ -334,6 +334,19 @@ config MMC_ATMELMCI
  26
  27           If unsure, say N.
  28
  29 +config MMC_SDHCI_MSM
  30 +       tristate "Qualcomm SDHCI Controller Support"
  31 +       depends on ARCH_QCOM
  32 +       depends on MMC_SDHCI_PLTFM
  33 +       help
  34 +         This selects the Secure Digital Host Controller Interface (SDHCI)
  35 +         support present in Qualcomm SOCs. The controller supports
  36 +         SD/MMC/SDIO devices.
  37 +
  38 +         If you have a controller with this interface, say Y or M here.
  39 +
  40 +         If unsure, say N.
  41 +
  42  config MMC_MSM
  43         tristate "Qualcomm SDCC Controller Support"
  44         depends on MMC && (ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50)
  45 --- a/drivers/mmc/host/Makefile
  46 +++ b/drivers/mmc/host/Makefile
  47 @@ -65,6 +65,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_ESDHC)      += sdhc
  48  obj-$(CONFIG_MMC_SDHCI_OF_HLWD)                += sdhci-of-hlwd.o
  49  obj-$(CONFIG_MMC_SDHCI_BCM_KONA)       += sdhci-bcm-kona.o
  50  obj-$(CONFIG_MMC_SDHCI_BCM2835)                += sdhci-bcm2835.o
  51 +obj-$(CONFIG_MMC_SDHCI_MSM)            += sdhci-msm.o
  52
  53  ifeq ($(CONFIG_CB710_DEBUG),y)
  54         CFLAGS-cb710-mmc        += -DDEBUG
  55 --- /dev/null
  56 +++ b/drivers/mmc/host/sdhci-msm.c
  57 @@ -0,0 +1,208 @@
  58 +/*
  59 + * drivers/mmc/host/sdhci-msm.c - Qualcomm SDHCI Platform driver
  60 + *
  61 + * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
  62 + *
  63 + * This program is free software; you can redistribute it and/or modify
  64 + * it under the terms of the GNU General Public License version 2 and
  65 + * only version 2 as published by the Free Software Foundation.
  66 + *
  67 + * This program is distributed in the hope that it will be useful,
  68 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  69 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  70 + * GNU General Public License for more details.
  71 + *
  72 + */
  73 +
  74 +#include <linux/module.h>
  75 +#include <linux/of_device.h>
  76 +#include <linux/regulator/consumer.h>
  77 +#include <linux/delay.h>
  78 +
  79 +#include "sdhci-pltfm.h"
  80 +
  81 +#define CORE_HC_MODE           0x78
  82 +#define HC_MODE_EN             0x1
  83 +#define CORE_POWER             0x0
  84 +#define CORE_SW_RST            BIT(7)
  85 +
  86 +
  87 +struct sdhci_msm_host {
  88 +       struct platform_device *pdev;
  89 +       void __iomem *core_mem; /* MSM SDCC mapped address */
  90 +       struct clk *clk;        /* main SD/MMC bus clock */
  91 +       struct clk *pclk;       /* SDHC peripheral bus clock */
  92 +       struct clk *bus_clk;    /* SDHC bus voter clock */
  93 +       struct mmc_host *mmc;
  94 +       struct sdhci_pltfm_data sdhci_msm_pdata;
  95 +};
  96 +
  97 +/* Platform specific tuning */
  98 +static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
  99 +{
 100 +       /*
 101 +        * Tuning is required for SDR104, HS200 and HS400 cards and if the clock
 102 +        * frequency greater than 100MHz in those modes. The standard tuning
 103 +        * procedure should not be executed, but a custom implementation will be
 104 +        * added here instead.
 105 +        */
 106 +       return 0;
 107 +}
 108 +
 109 +static const struct of_device_id sdhci_msm_dt_match[] = {
 110 +       { .compatible = "qcom,sdhci-msm-v4" },
 111 +       {},
 112 +};
 113 +
 114 +MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match);
 115 +
 116 +static struct sdhci_ops sdhci_msm_ops = {
 117 +       .platform_execute_tuning = sdhci_msm_execute_tuning,
 118 +};
 119 +
 120 +static int sdhci_msm_probe(struct platform_device *pdev)
 121 +{
 122 +       struct sdhci_host *host;
 123 +       struct sdhci_pltfm_host *pltfm_host;
 124 +       struct sdhci_msm_host *msm_host;
 125 +       struct resource *core_memres;
 126 +       int ret;
 127 +       u16 host_version;
 128 +
 129 +       msm_host = devm_kzalloc(&pdev->dev, sizeof(*msm_host), GFP_KERNEL);
 130 +       if (!msm_host)
 131 +               return -ENOMEM;
 132 +
 133 +       msm_host->sdhci_msm_pdata.ops = &sdhci_msm_ops;
 134 +       host = sdhci_pltfm_init(pdev, &msm_host->sdhci_msm_pdata, 0);
 135 +       if (IS_ERR(host))
 136 +               return PTR_ERR(host);
 137 +
 138 +       pltfm_host = sdhci_priv(host);
 139 +       pltfm_host->priv = msm_host;
 140 +       msm_host->mmc = host->mmc;
 141 +       msm_host->pdev = pdev;
 142 +
 143 +       ret = mmc_of_parse(host->mmc);
 144 +       if (ret)
 145 +               goto pltfm_free;
 146 +
 147 +       sdhci_get_of_property(pdev);
 148 +
 149 +       /* Setup SDCC bus voter clock. */
 150 +       msm_host->bus_clk = devm_clk_get(&pdev->dev, "bus");
 151 +       if (!IS_ERR(msm_host->bus_clk)) {
 152 +               /* Vote for max. clk rate for max. performance */
 153 +               ret = clk_set_rate(msm_host->bus_clk, INT_MAX);
 154 +               if (ret)
 155 +                       goto pltfm_free;
 156 +               ret = clk_prepare_enable(msm_host->bus_clk);
 157 +               if (ret)
 158 +                       goto pltfm_free;
 159 +       }
 160 +
 161 +       /* Setup main peripheral bus clock */
 162 +       msm_host->pclk = devm_clk_get(&pdev->dev, "iface");
 163 +       if (IS_ERR(msm_host->pclk)) {
 164 +               ret = PTR_ERR(msm_host->pclk);
 165 +               dev_err(&pdev->dev, "Perpheral clk setup failed (%d)\n", ret);
 166 +               goto bus_clk_disable;
 167 +       }
 168 +
 169 +       ret = clk_prepare_enable(msm_host->pclk);
 170 +       if (ret)
 171 +               goto bus_clk_disable;
 172 +
 173 +       /* Setup SDC MMC clock */
 174 +       msm_host->clk = devm_clk_get(&pdev->dev, "core");
 175 +       if (IS_ERR(msm_host->clk)) {
 176 +               ret = PTR_ERR(msm_host->clk);
 177 +               dev_err(&pdev->dev, "SDC MMC clk setup failed (%d)\n", ret);
 178 +               goto pclk_disable;
 179 +       }
 180 +
 181 +       ret = clk_prepare_enable(msm_host->clk);
 182 +       if (ret)
 183 +               goto pclk_disable;
 184 +
 185 +       core_memres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 186 +       msm_host->core_mem = devm_ioremap_resource(&pdev->dev, core_memres);
 187 +
 188 +       if (IS_ERR(msm_host->core_mem)) {
 189 +               dev_err(&pdev->dev, "Failed to remap registers\n");
 190 +               ret = PTR_ERR(msm_host->core_mem);
 191 +               goto clk_disable;
 192 +       }
 193 +
 194 +       /* Reset the core and Enable SDHC mode */
 195 +       writel_relaxed(readl_relaxed(msm_host->core_mem + CORE_POWER) |
 196 +                      CORE_SW_RST, msm_host->core_mem + CORE_POWER);
 197 +
 198 +       /* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
 199 +       usleep_range(1000, 5000);
 200 +       if (readl(msm_host->core_mem + CORE_POWER) & CORE_SW_RST) {
 201 +               dev_err(&pdev->dev, "Stuck in reset\n");
 202 +               ret = -ETIMEDOUT;
 203 +               goto clk_disable;
 204 +       }
 205 +
 206 +       /* Set HC_MODE_EN bit in HC_MODE register */
 207 +       writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE));
 208 +
 209 +       host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 210 +       host->quirks |= SDHCI_QUIRK_SINGLE_POWER_WRITE;
 211 +
 212 +       host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
 213 +       dev_dbg(&pdev->dev, "Host Version: 0x%x Vendor Version 0x%x\n",
 214 +               host_version, ((host_version & SDHCI_VENDOR_VER_MASK) >>
 215 +                              SDHCI_VENDOR_VER_SHIFT));
 216 +
 217 +       ret = sdhci_add_host(host);
 218 +       if (ret)
 219 +               goto clk_disable;
 220 +
 221 +       return 0;
 222 +
 223 +clk_disable:
 224 +       clk_disable_unprepare(msm_host->clk);
 225 +pclk_disable:
 226 +       clk_disable_unprepare(msm_host->pclk);
 227 +bus_clk_disable:
 228 +       if (!IS_ERR(msm_host->bus_clk))
 229 +               clk_disable_unprepare(msm_host->bus_clk);
 230 +pltfm_free:
 231 +       sdhci_pltfm_free(pdev);
 232 +       return ret;
 233 +}
 234 +
 235 +static int sdhci_msm_remove(struct platform_device *pdev)
 236 +{
 237 +       struct sdhci_host *host = platform_get_drvdata(pdev);
 238 +       struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 239 +       struct sdhci_msm_host *msm_host = pltfm_host->priv;
 240 +       int dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) ==
 241 +                   0xffffffff);
 242 +
 243 +       sdhci_remove_host(host, dead);
 244 +       sdhci_pltfm_free(pdev);
 245 +       clk_disable_unprepare(msm_host->clk);
 246 +       clk_disable_unprepare(msm_host->pclk);
 247 +       if (!IS_ERR(msm_host->bus_clk))
 248 +               clk_disable_unprepare(msm_host->bus_clk);
 249 +       return 0;
 250 +}
 251 +
 252 +static struct platform_driver sdhci_msm_driver = {
 253 +       .probe = sdhci_msm_probe,
 254 +       .remove = sdhci_msm_remove,
 255 +       .driver = {
 256 +                  .name = "sdhci_msm",
 257 +                  .owner = THIS_MODULE,
 258 +                  .of_match_table = sdhci_msm_dt_match,
 259 +       },
 260 +};
 261 +
 262 +module_platform_driver(sdhci_msm_driver);
 263 +
 264 +MODULE_DESCRIPTION("Qualcomm Secure Digital Host Controller Interface driver");
 265 +MODULE_LICENSE("GPL v2");