drivers/mmc/host/sdhci-pxav2.c

   1 /*
   2  * Copyright (C) 2010 Marvell International Ltd.
   3  *              Zhangfei Gao <zhangfei.gao@marvell.com>
   4  *              Kevin Wang <dwang4@marvell.com>
   5  *              Jun Nie <njun@marvell.com>
   6  *              Qiming Wu <wuqm@marvell.com>
   7  *              Philip Rakity <prakity@marvell.com>
   8  *
   9  * This software is licensed under the terms of the GNU General Public
  10  * License version 2, as published by the Free Software Foundation, and
  11  * may be copied, distributed, and modified under those terms.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  */
  19
  20 #include <linux/err.h>
  21 #include <linux/init.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/clk.h>
  24 #include <linux/module.h>
  25 #include <linux/io.h>
  26 #include <linux/gpio.h>
  27 #include <linux/mmc/card.h>
  28 #include <linux/mmc/host.h>
  29 #include <linux/platform_data/pxa_sdhci.h>
  30 #include <linux/slab.h>
  31 #include <linux/of.h>
  32 #include <linux/of_device.h>
  33
  34 #include "sdhci.h"
  35 #include "sdhci-pltfm.h"
  36
  37 #define SD_FIFO_PARAM           0xe0
  38 #define DIS_PAD_SD_CLK_GATE     0x0400 /* Turn on/off Dynamic SD Clock Gating */
  39 #define CLK_GATE_ON             0x0200 /* Disable/enable Clock Gate */
  40 #define CLK_GATE_CTL            0x0100 /* Clock Gate Control */
  41 #define CLK_GATE_SETTING_BITS   (DIS_PAD_SD_CLK_GATE | \
  42                 CLK_GATE_ON | CLK_GATE_CTL)
  43
  44 #define SD_CLOCK_BURST_SIZE_SETUP       0xe6
  45 #define SDCLK_SEL_SHIFT         8
  46 #define SDCLK_SEL_MASK          0x3
  47 #define SDCLK_DELAY_SHIFT       10
  48 #define SDCLK_DELAY_MASK        0x3c
  49
  50 #define SD_CE_ATA_2             0xea
  51 #define MMC_CARD                0x1000
  52 #define MMC_WIDTH               0x0100
  53
  54 static void pxav2_set_private_registers(struct sdhci_host *host, u8 mask)
  55 {
  56         struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
  57         struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
  58
  59         if (mask == SDHCI_RESET_ALL) {
  60                 u16 tmp = 0;
  61
  62                 /*
  63                  * tune timing of read data/command when crc error happen
  64                  * no performance impact
  65                  */
  66                 if (pdata && pdata->clk_delay_sel == 1) {
  67                         tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
  68
  69                         tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT);
  70                         tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
  71                                 << SDCLK_DELAY_SHIFT;
  72                         tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT);
  73                         tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT;
  74
  75                         writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
  76                 }
  77
  78                 if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) {
  79                         tmp = readw(host->ioaddr + SD_FIFO_PARAM);
  80                         tmp &= ~CLK_GATE_SETTING_BITS;
  81                         writew(tmp, host->ioaddr + SD_FIFO_PARAM);
  82                 } else {
  83                         tmp = readw(host->ioaddr + SD_FIFO_PARAM);
  84                         tmp &= ~CLK_GATE_SETTING_BITS;
  85                         tmp |= CLK_GATE_SETTING_BITS;
  86                         writew(tmp, host->ioaddr + SD_FIFO_PARAM);
  87                 }
  88         }
  89 }
  90
  91 static int pxav2_mmc_set_width(struct sdhci_host *host, int width)
  92 {
  93         u8 ctrl;
  94         u16 tmp;
  95
  96         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
  97         tmp = readw(host->ioaddr + SD_CE_ATA_2);
  98         if (width == MMC_BUS_WIDTH_8) {
  99                 ctrl &= ~SDHCI_CTRL_4BITBUS;
 100                 tmp |= MMC_CARD | MMC_WIDTH;
 101         } else {
 102                 tmp &= ~(MMC_CARD | MMC_WIDTH);
 103                 if (width == MMC_BUS_WIDTH_4)
 104                         ctrl |= SDHCI_CTRL_4BITBUS;
 105                 else
 106                         ctrl &= ~SDHCI_CTRL_4BITBUS;
 107         }
 108         writew(tmp, host->ioaddr + SD_CE_ATA_2);
 109         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 110
 111         return 0;
 112 }
 113
 114 static const struct sdhci_ops pxav2_sdhci_ops = {
 115         .get_max_clock = sdhci_pltfm_clk_get_max_clock,
 116         .platform_reset_exit = pxav2_set_private_registers,
 117         .platform_bus_width = pxav2_mmc_set_width,
 118 };
 119
 120 #ifdef CONFIG_OF
 121 static const struct of_device_id sdhci_pxav2_of_match[] = {
 122         {
 123                 .compatible = "mrvl,pxav2-mmc",
 124         },
 125         {},
 126 };
 127 MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match);
 128
 129 static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
 130 {
 131         struct sdhci_pxa_platdata *pdata;
 132         struct device_node *np = dev->of_node;
 133         u32 bus_width;
 134         u32 clk_delay_cycles;
 135
 136         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 137         if (!pdata)
 138                 return NULL;
 139
 140         if (of_find_property(np, "non-removable", NULL))
 141                 pdata->flags |= PXA_FLAG_CARD_PERMANENT;
 142
 143         of_property_read_u32(np, "bus-width", &bus_width);
 144         if (bus_width == 8)
 145                 pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT;
 146
 147         of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
 148         if (clk_delay_cycles > 0) {
 149                 pdata->clk_delay_sel = 1;
 150                 pdata->clk_delay_cycles = clk_delay_cycles;
 151         }
 152
 153         return pdata;
 154 }
 155 #else
 156 static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
 157 {
 158         return NULL;
 159 }
 160 #endif
 161
 162 static int sdhci_pxav2_probe(struct platform_device *pdev)
 163 {
 164         struct sdhci_pltfm_host *pltfm_host;
 165         struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
 166         struct device *dev = &pdev->dev;
 167         struct sdhci_host *host = NULL;
 168         struct sdhci_pxa *pxa = NULL;
 169         const struct of_device_id *match;
 170
 171         int ret;
 172         struct clk *clk;
 173
 174         pxa = kzalloc(sizeof(struct sdhci_pxa), GFP_KERNEL);
 175         if (!pxa)
 176                 return -ENOMEM;
 177
 178         host = sdhci_pltfm_init(pdev, NULL, 0);
 179         if (IS_ERR(host)) {
 180                 kfree(pxa);
 181                 return PTR_ERR(host);
 182         }
 183         pltfm_host = sdhci_priv(host);
 184         pltfm_host->priv = pxa;
 185
 186         clk = clk_get(dev, "PXA-SDHCLK");
 187         if (IS_ERR(clk)) {
 188                 dev_err(dev, "failed to get io clock\n");
 189                 ret = PTR_ERR(clk);
 190                 goto err_clk_get;
 191         }
 192         pltfm_host->clk = clk;
 193         clk_prepare_enable(clk);
 194
 195         host->quirks = SDHCI_QUIRK_BROKEN_ADMA
 196                 | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
 197                 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
 198
 199         match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev);
 200         if (match) {
 201                 pdata = pxav2_get_mmc_pdata(dev);
 202         }
 203         if (pdata) {
 204                 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {
 205                         /* on-chip device */
 206                         host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 207                         host->mmc->caps |= MMC_CAP_NONREMOVABLE;
 208                 }
 209
 210                 /* If slot design supports 8 bit data, indicate this to MMC. */
 211                 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
 212                         host->mmc->caps |= MMC_CAP_8_BIT_DATA;
 213
 214                 if (pdata->quirks)
 215                         host->quirks |= pdata->quirks;
 216                 if (pdata->host_caps)
 217                         host->mmc->caps |= pdata->host_caps;
 218                 if (pdata->pm_caps)
 219                         host->mmc->pm_caps |= pdata->pm_caps;
 220         }
 221
 222         host->ops = &pxav2_sdhci_ops;
 223
 224         ret = sdhci_add_host(host);
 225         if (ret) {
 226                 dev_err(&pdev->dev, "failed to add host\n");
 227                 goto err_add_host;
 228         }
 229
 230         platform_set_drvdata(pdev, host);
 231
 232         return 0;
 233
 234 err_add_host:
 235         clk_disable_unprepare(clk);
 236         clk_put(clk);
 237 err_clk_get:
 238         sdhci_pltfm_free(pdev);
 239         kfree(pxa);
 240         return ret;
 241 }
 242
 243 static int sdhci_pxav2_remove(struct platform_device *pdev)
 244 {
 245         struct sdhci_host *host = platform_get_drvdata(pdev);
 246         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 247         struct sdhci_pxa *pxa = pltfm_host->priv;
 248
 249         sdhci_remove_host(host, 1);
 250
 251         clk_disable_unprepare(pltfm_host->clk);
 252         clk_put(pltfm_host->clk);
 253         sdhci_pltfm_free(pdev);
 254         kfree(pxa);
 255
 256         return 0;
 257 }
 258
 259 static struct platform_driver sdhci_pxav2_driver = {
 260         .driver         = {
 261                 .name   = "sdhci-pxav2",
 262                 .owner  = THIS_MODULE,
 263 #ifdef CONFIG_OF
 264                 .of_match_table = sdhci_pxav2_of_match,
 265 #endif
 266                 .pm     = SDHCI_PLTFM_PMOPS,
 267         },
 268         .probe          = sdhci_pxav2_probe,
 269         .remove         = sdhci_pxav2_remove,
 270 };
 271
 272 module_platform_driver(sdhci_pxav2_driver);
 273
 274 MODULE_DESCRIPTION("SDHCI driver for pxav2");
 275 MODULE_AUTHOR("Marvell International Ltd.");
 276 MODULE_LICENSE("GPL v2");
 277