drivers/mmc/host/sdhci-pxav2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2010 Marvell International Ltd.
   4  *              Zhangfei Gao <[email protected]>
   5  *              Kevin Wang <[email protected]>
   6  *              Jun Nie <[email protected]>
   7  *              Qiming Wu <[email protected]>
   8  *              Philip Rakity <[email protected]>
   9  */
  10
  11 #include <linux/err.h>
  12 #include <linux/init.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/clk.h>
  15 #include <linux/module.h>
  16 #include <linux/io.h>
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/host.h>
  19 #include <linux/platform_data/pxa_sdhci.h>
  20 #include <linux/slab.h>
  21 #include <linux/of.h>
  22 #include <linux/of_device.h>
  23
  24 #include "sdhci.h"
  25 #include "sdhci-pltfm.h"
  26
  27 #define SD_FIFO_PARAM           0xe0
  28 #define DIS_PAD_SD_CLK_GATE     0x0400 /* Turn on/off Dynamic SD Clock Gating */
  29 #define CLK_GATE_ON             0x0200 /* Disable/enable Clock Gate */
  30 #define CLK_GATE_CTL            0x0100 /* Clock Gate Control */
  31 #define CLK_GATE_SETTING_BITS   (DIS_PAD_SD_CLK_GATE | \
  32                 CLK_GATE_ON | CLK_GATE_CTL)
  33
  34 #define SD_CLOCK_BURST_SIZE_SETUP       0xe6
  35 #define SDCLK_SEL_SHIFT         8
  36 #define SDCLK_SEL_MASK          0x3
  37 #define SDCLK_DELAY_SHIFT       10
  38 #define SDCLK_DELAY_MASK        0x3c
  39
  40 #define SD_CE_ATA_2             0xea
  41 #define MMC_CARD                0x1000
  42 #define MMC_WIDTH               0x0100
  43
  44 static void pxav2_reset(struct sdhci_host *host, u8 mask)
  45 {
  46         struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
  47         struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
  48
  49         sdhci_reset(host, mask);
  50
  51         if (mask == SDHCI_RESET_ALL) {
  52                 u16 tmp = 0;
  53
  54                 /*
  55                  * tune timing of read data/command when crc error happen
  56                  * no performance impact
  57                  */
  58                 if (pdata && pdata->clk_delay_sel == 1) {
  59                         tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
  60
  61                         tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT);
  62                         tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
  63                                 << SDCLK_DELAY_SHIFT;
  64                         tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT);
  65                         tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT;
  66
  67                         writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
  68                 }
  69
  70                 if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) {
  71                         tmp = readw(host->ioaddr + SD_FIFO_PARAM);
  72                         tmp &= ~CLK_GATE_SETTING_BITS;
  73                         writew(tmp, host->ioaddr + SD_FIFO_PARAM);
  74                 } else {
  75                         tmp = readw(host->ioaddr + SD_FIFO_PARAM);
  76                         tmp &= ~CLK_GATE_SETTING_BITS;
  77                         tmp |= CLK_GATE_SETTING_BITS;
  78                         writew(tmp, host->ioaddr + SD_FIFO_PARAM);
  79                 }
  80         }
  81 }
  82
  83 static void pxav2_mmc_set_bus_width(struct sdhci_host *host, int width)
  84 {
  85         u8 ctrl;
  86         u16 tmp;
  87
  88         ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
  89         tmp = readw(host->ioaddr + SD_CE_ATA_2);
  90         if (width == MMC_BUS_WIDTH_8) {
  91                 ctrl &= ~SDHCI_CTRL_4BITBUS;
  92                 tmp |= MMC_CARD | MMC_WIDTH;
  93         } else {
  94                 tmp &= ~(MMC_CARD | MMC_WIDTH);
  95                 if (width == MMC_BUS_WIDTH_4)
  96                         ctrl |= SDHCI_CTRL_4BITBUS;
  97                 else
  98                         ctrl &= ~SDHCI_CTRL_4BITBUS;
  99         }
 100         writew(tmp, host->ioaddr + SD_CE_ATA_2);
 101         writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
 102 }
 103
 104 static const struct sdhci_ops pxav2_sdhci_ops = {
 105         .set_clock     = sdhci_set_clock,
 106         .get_max_clock = sdhci_pltfm_clk_get_max_clock,
 107         .set_bus_width = pxav2_mmc_set_bus_width,
 108         .reset         = pxav2_reset,
 109         .set_uhs_signaling = sdhci_set_uhs_signaling,
 110 };
 111
 112 #ifdef CONFIG_OF
 113 static const struct of_device_id sdhci_pxav2_of_match[] = {
 114         {
 115                 .compatible = "mrvl,pxav2-mmc",
 116         },
 117         {},
 118 };
 119 MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match);
 120
 121 static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
 122 {
 123         struct sdhci_pxa_platdata *pdata;
 124         struct device_node *np = dev->of_node;
 125         u32 bus_width;
 126         u32 clk_delay_cycles;
 127
 128         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 129         if (!pdata)
 130                 return NULL;
 131
 132         if (of_find_property(np, "non-removable", NULL))
 133                 pdata->flags |= PXA_FLAG_CARD_PERMANENT;
 134
 135         of_property_read_u32(np, "bus-width", &bus_width);
 136         if (bus_width == 8)
 137                 pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT;
 138
 139         of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
 140         if (clk_delay_cycles > 0) {
 141                 pdata->clk_delay_sel = 1;
 142                 pdata->clk_delay_cycles = clk_delay_cycles;
 143         }
 144
 145         return pdata;
 146 }
 147 #else
 148 static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
 149 {
 150         return NULL;
 151 }
 152 #endif
 153
 154 static int sdhci_pxav2_probe(struct platform_device *pdev)
 155 {
 156         struct sdhci_pltfm_host *pltfm_host;
 157         struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
 158         struct device *dev = &pdev->dev;
 159         struct sdhci_host *host = NULL;
 160         const struct of_device_id *match;
 161
 162         int ret;
 163         struct clk *clk;
 164
 165         host = sdhci_pltfm_init(pdev, NULL, 0);
 166         if (IS_ERR(host))
 167                 return PTR_ERR(host);
 168
 169         pltfm_host = sdhci_priv(host);
 170
 171         clk = devm_clk_get(dev, "PXA-SDHCLK");
 172         if (IS_ERR(clk)) {
 173                 dev_err(dev, "failed to get io clock\n");
 174                 ret = PTR_ERR(clk);
 175                 goto free;
 176         }
 177         pltfm_host->clk = clk;
 178         ret = clk_prepare_enable(clk);
 179         if (ret) {
 180                 dev_err(&pdev->dev, "failed to enable io clock\n");
 181                 goto free;
 182         }
 183
 184         host->quirks = SDHCI_QUIRK_BROKEN_ADMA
 185                 | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
 186                 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
 187
 188         match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev);
 189         if (match) {
 190                 pdata = pxav2_get_mmc_pdata(dev);
 191         }
 192         if (pdata) {
 193                 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {
 194                         /* on-chip device */
 195                         host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
 196                         host->mmc->caps |= MMC_CAP_NONREMOVABLE;
 197                 }
 198
 199                 /* If slot design supports 8 bit data, indicate this to MMC. */
 200                 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
 201                         host->mmc->caps |= MMC_CAP_8_BIT_DATA;
 202
 203                 if (pdata->quirks)
 204                         host->quirks |= pdata->quirks;
 205                 if (pdata->host_caps)
 206                         host->mmc->caps |= pdata->host_caps;
 207                 if (pdata->pm_caps)
 208                         host->mmc->pm_caps |= pdata->pm_caps;
 209         }
 210
 211         host->ops = &pxav2_sdhci_ops;
 212
 213         ret = sdhci_add_host(host);
 214         if (ret)
 215                 goto disable_clk;
 216
 217         return 0;
 218
 219 disable_clk:
 220         clk_disable_unprepare(clk);
 221 free:
 222         sdhci_pltfm_free(pdev);
 223         return ret;
 224 }
 225
 226 static struct platform_driver sdhci_pxav2_driver = {
 227         .driver         = {
 228                 .name   = "sdhci-pxav2",
 229                 .of_match_table = of_match_ptr(sdhci_pxav2_of_match),
 230                 .pm     = &sdhci_pltfm_pmops,
 231         },
 232         .probe          = sdhci_pxav2_probe,
 233         .remove         = sdhci_pltfm_unregister,
 234 };
 235
 236 module_platform_driver(sdhci_pxav2_driver);
 237
 238 MODULE_DESCRIPTION("SDHCI driver for pxav2");
 239 MODULE_AUTHOR("Marvell International Ltd.");
 240 MODULE_LICENSE("GPL v2");
 241