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 "sdhci.h"
  32 #include "sdhci-pltfm.h"
  33
  34 #define SD_FIFO_PARAM           0xe0
  35 #define DIS_PAD_SD_CLK_GATE     0x0400 /* Turn on/off Dynamic SD Clock Gating */
  36 #define CLK_GATE_ON             0x0200 /* Disable/enable Clock Gate */
  37 #define CLK_GATE_CTL            0x0100 /* Clock Gate Control */
  38 #define CLK_GATE_SETTING_BITS   (DIS_PAD_SD_CLK_GATE | \
  39                 CLK_GATE_ON | CLK_GATE_CTL)
  40
  41 #define SD_CLOCK_BURST_SIZE_SETUP       0xe6
  42 #define SDCLK_SEL_SHIFT         8
  43 #define SDCLK_SEL_MASK          0x3
  44 #define SDCLK_DELAY_SHIFT       10
  45 #define SDCLK_DELAY_MASK        0x3c
  46
  47 #define SD_CE_ATA_2             0xea
  48 #define MMC_CARD                0x1000
  49 #define MMC_WIDTH               0x0100
  50
  51 static void pxav2_set_private_registers(struct sdhci_host *host, u8 mask)
  52 {
  53         struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
  54         struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
  55
  56         if (mask == SDHCI_RESET_ALL) {
  57                 u16 tmp = 0;
  58
  59                 /*
  60                  * tune timing of read data/command when crc error happen
  61                  * no performance impact
  62                  */
  63                 if (pdata && pdata->clk_delay_sel == 1) {
  64                         tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
  65
  66                         tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT);
  67                         tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
  68                                 << SDCLK_DELAY_SHIFT;
  69                         tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT);
  70                         tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT;
  71
  72                         writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
  73                 }
  74
  75                 if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) {
  76                         tmp = readw(host->ioaddr + SD_FIFO_PARAM);
  77                         tmp &= ~CLK_GATE_SETTING_BITS;
  78                         writew(tmp, host->ioaddr + SD_FIFO_PARAM);
  79                 } else {
  80                         tmp = readw(host->ioaddr + SD_FIFO_PARAM);
  81                         tmp &= ~CLK_GATE_SETTING_BITS;
  82                         tmp |= CLK_GATE_SETTING_BITS;
  83                         writew(tmp, host->ioaddr + SD_FIFO_PARAM);
  84                 }
  85         }
  86 }
  87
  88 static int pxav2_mmc_set_width(struct sdhci_host *host, int width)
  89 {
  90         u8 ctrl;
  91         u16 tmp;
  92
  93         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
  94         tmp = readw(host->ioaddr + SD_CE_ATA_2);
  95         if (width == MMC_BUS_WIDTH_8) {
  96                 ctrl &= ~SDHCI_CTRL_4BITBUS;
  97                 tmp |= MMC_CARD | MMC_WIDTH;
  98         } else {
  99                 tmp &= ~(MMC_CARD | MMC_WIDTH);
 100                 if (width == MMC_BUS_WIDTH_4)
 101                         ctrl |= SDHCI_CTRL_4BITBUS;
 102                 else
 103                         ctrl &= ~SDHCI_CTRL_4BITBUS;
 104         }
 105         writew(tmp, host->ioaddr + SD_CE_ATA_2);
 106         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 107
 108         return 0;
 109 }
 110
 111 static u32 pxav2_get_max_clock(struct sdhci_host *host)
 112 {
 113         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 114
 115         return clk_get_rate(pltfm_host->clk);
 116 }
 117
 118 static struct sdhci_ops pxav2_sdhci_ops = {
 119         .get_max_clock = pxav2_get_max_clock,
 120         .platform_reset_exit = pxav2_set_private_registers,
 121         .platform_8bit_width = pxav2_mmc_set_width,
 122 };
 123
 124 static int __devinit sdhci_pxav2_probe(struct platform_device *pdev)
 125 {
 126         struct sdhci_pltfm_host *pltfm_host;
 127         struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
 128         struct device *dev = &pdev->dev;
 129         struct sdhci_host *host = NULL;
 130         struct sdhci_pxa *pxa = NULL;
 131         int ret;
 132         struct clk *clk;
 133
 134         pxa = kzalloc(sizeof(struct sdhci_pxa), GFP_KERNEL);
 135         if (!pxa)
 136                 return -ENOMEM;
 137
 138         host = sdhci_pltfm_init(pdev, NULL);
 139         if (IS_ERR(host)) {
 140                 kfree(pxa);
 141                 return PTR_ERR(host);
 142         }
 143         pltfm_host = sdhci_priv(host);
 144         pltfm_host->priv = pxa;
 145
 146         clk = clk_get(dev, "PXA-SDHCLK");
 147         if (IS_ERR(clk)) {
 148                 dev_err(dev, "failed to get io clock\n");
 149                 ret = PTR_ERR(clk);
 150                 goto err_clk_get;
 151         }
 152         pltfm_host->clk = clk;
 153         clk_enable(clk);
 154
 155         host->quirks = SDHCI_QUIRK_BROKEN_ADMA
 156                 | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
 157                 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
 158
 159         if (pdata) {
 160                 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {
 161                         /* on-chip device */
 162                         host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 163                         host->mmc->caps |= MMC_CAP_NONREMOVABLE;
 164                 }
 165
 166                 /* If slot design supports 8 bit data, indicate this to MMC. */
 167                 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
 168                         host->mmc->caps |= MMC_CAP_8_BIT_DATA;
 169
 170                 if (pdata->quirks)
 171                         host->quirks |= pdata->quirks;
 172                 if (pdata->host_caps)
 173                         host->mmc->caps |= pdata->host_caps;
 174                 if (pdata->pm_caps)
 175                         host->mmc->pm_caps |= pdata->pm_caps;
 176         }
 177
 178         host->ops = &pxav2_sdhci_ops;
 179
 180         ret = sdhci_add_host(host);
 181         if (ret) {
 182                 dev_err(&pdev->dev, "failed to add host\n");
 183                 goto err_add_host;
 184         }
 185
 186         platform_set_drvdata(pdev, host);
 187
 188         return 0;
 189
 190 err_add_host:
 191         clk_disable(clk);
 192         clk_put(clk);
 193 err_clk_get:
 194         sdhci_pltfm_free(pdev);
 195         kfree(pxa);
 196         return ret;
 197 }
 198
 199 static int __devexit sdhci_pxav2_remove(struct platform_device *pdev)
 200 {
 201         struct sdhci_host *host = platform_get_drvdata(pdev);
 202         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 203         struct sdhci_pxa *pxa = pltfm_host->priv;
 204
 205         sdhci_remove_host(host, 1);
 206
 207         clk_disable(pltfm_host->clk);
 208         clk_put(pltfm_host->clk);
 209         sdhci_pltfm_free(pdev);
 210         kfree(pxa);
 211
 212         platform_set_drvdata(pdev, NULL);
 213
 214         return 0;
 215 }
 216
 217 static struct platform_driver sdhci_pxav2_driver = {
 218         .driver         = {
 219                 .name   = "sdhci-pxav2",
 220                 .owner  = THIS_MODULE,
 221                 .pm     = SDHCI_PLTFM_PMOPS,
 222         },
 223         .probe          = sdhci_pxav2_probe,
 224         .remove         = __devexit_p(sdhci_pxav2_remove),
 225 };
 226
 227 module_platform_driver(sdhci_pxav2_driver);
 228
 229 MODULE_DESCRIPTION("SDHCI driver for pxav2");
 230 MODULE_AUTHOR("Marvell International Ltd.");
 231 MODULE_LICENSE("GPL v2");
 232