drivers/mmc/host/dw_mmc-pltfm.c

   1 /*
   2  * Synopsys DesignWare Multimedia Card Interface driver
   3  *
   4  * Copyright (C) 2009 NXP Semiconductors
   5  * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/io.h>
  17 #include <linux/irq.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20 #include <linux/mmc/host.h>
  21 #include <linux/mmc/mmc.h>
  22 #include <linux/mmc/dw_mmc.h>
  23 #include <linux/of.h>
  24 #include <linux/clk.h>
  25
  26 #include "dw_mmc.h"
  27 #include "dw_mmc-pltfm.h"
  28
  29 #define RK3288_CLKGEN_DIV       2
  30
  31 static void dw_mci_pltfm_prepare_command(struct dw_mci *host, u32 *cmdr)
  32 {
  33         *cmdr |= SDMMC_CMD_USE_HOLD_REG;
  34 }
  35
  36 static int dw_mci_rk3288_setup_clock(struct dw_mci *host)
  37 {
  38         host->bus_hz /= RK3288_CLKGEN_DIV;
  39
  40         return 0;
  41 }
  42
  43 static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  44 {
  45         int ret;
  46         unsigned int cclkin;
  47         u32 bus_hz;
  48
  49         /*
  50          * cclkin: source clock of mmc controller.
  51          * bus_hz: card interface clock generated by CLKGEN.
  52          * bus_hz = cclkin / RK3288_CLKGEN_DIV;
  53          * ios->clock = (div == 0) ? bus_hz : (bus_hz / (2 * div))
  54          *
  55          * Note: div can only be 0 or 1
  56          *       if DDR50 8bit mode(only emmc work in 8bit mode),
  57          *       div must be set 1
  58          */
  59         if ((ios->bus_width == MMC_BUS_WIDTH_8) &&
  60             (ios->timing == MMC_TIMING_MMC_DDR52))
  61                 cclkin = 2 * ios->clock * RK3288_CLKGEN_DIV;
  62         else
  63                 cclkin = ios->clock * RK3288_CLKGEN_DIV;
  64
  65         ret = clk_set_rate(host->ciu_clk, cclkin);
  66         if (ret)
  67                 dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
  68
  69         bus_hz = clk_get_rate(host->ciu_clk) / RK3288_CLKGEN_DIV;
  70         if (bus_hz != host->bus_hz) {
  71                 host->bus_hz = bus_hz;
  72                 /* force dw_mci_setup_bus() */
  73                 host->current_speed = 0;
  74         }
  75 }
  76
  77 static const struct dw_mci_drv_data rk2928_drv_data = {
  78         .prepare_command        = dw_mci_pltfm_prepare_command,
  79 };
  80
  81 static const struct dw_mci_drv_data rk3288_drv_data = {
  82         .prepare_command        = dw_mci_pltfm_prepare_command,
  83         .set_ios        = dw_mci_rk3288_set_ios,
  84         .setup_clock    = dw_mci_rk3288_setup_clock,
  85 };
  86
  87 static const struct dw_mci_drv_data socfpga_drv_data = {
  88         .prepare_command        = dw_mci_pltfm_prepare_command,
  89 };
  90
  91 int dw_mci_pltfm_register(struct platform_device *pdev,
  92                           const struct dw_mci_drv_data *drv_data)
  93 {
  94         struct dw_mci *host;
  95         struct resource *regs;
  96
  97         host = devm_kzalloc(&pdev->dev, sizeof(struct dw_mci), GFP_KERNEL);
  98         if (!host)
  99                 return -ENOMEM;
 100
 101         host->irq = platform_get_irq(pdev, 0);
 102         if (host->irq < 0)
 103                 return host->irq;
 104
 105         host->drv_data = drv_data;
 106         host->dev = &pdev->dev;
 107         host->irq_flags = 0;
 108         host->pdata = pdev->dev.platform_data;
 109
 110         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 111         host->regs = devm_ioremap_resource(&pdev->dev, regs);
 112         if (IS_ERR(host->regs))
 113                 return PTR_ERR(host->regs);
 114
 115         platform_set_drvdata(pdev, host);
 116         return dw_mci_probe(host);
 117 }
 118 EXPORT_SYMBOL_GPL(dw_mci_pltfm_register);
 119
 120 #ifdef CONFIG_PM_SLEEP
 121 /*
 122  * TODO: we should probably disable the clock to the card in the suspend path.
 123  */
 124 static int dw_mci_pltfm_suspend(struct device *dev)
 125 {
 126         struct dw_mci *host = dev_get_drvdata(dev);
 127
 128         return dw_mci_suspend(host);
 129 }
 130
 131 static int dw_mci_pltfm_resume(struct device *dev)
 132 {
 133         struct dw_mci *host = dev_get_drvdata(dev);
 134
 135         return dw_mci_resume(host);
 136 }
 137 #endif /* CONFIG_PM_SLEEP */
 138
 139 SIMPLE_DEV_PM_OPS(dw_mci_pltfm_pmops, dw_mci_pltfm_suspend, dw_mci_pltfm_resume);
 140 EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);
 141
 142 static const struct of_device_id dw_mci_pltfm_match[] = {
 143         { .compatible = "snps,dw-mshc", },
 144         { .compatible = "rockchip,rk2928-dw-mshc",
 145                 .data = &rk2928_drv_data },
 146         { .compatible = "rockchip,rk3288-dw-mshc",
 147                 .data = &rk3288_drv_data },
 148         { .compatible = "altr,socfpga-dw-mshc",
 149                 .data = &socfpga_drv_data },
 150         {},
 151 };
 152 MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);
 153
 154 static int dw_mci_pltfm_probe(struct platform_device *pdev)
 155 {
 156         const struct dw_mci_drv_data *drv_data = NULL;
 157         const struct of_device_id *match;
 158
 159         if (pdev->dev.of_node) {
 160                 match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
 161                 drv_data = match->data;
 162         }
 163
 164         return dw_mci_pltfm_register(pdev, drv_data);
 165 }
 166
 167 int dw_mci_pltfm_remove(struct platform_device *pdev)
 168 {
 169         struct dw_mci *host = platform_get_drvdata(pdev);
 170
 171         dw_mci_remove(host);
 172         return 0;
 173 }
 174 EXPORT_SYMBOL_GPL(dw_mci_pltfm_remove);
 175
 176 static struct platform_driver dw_mci_pltfm_driver = {
 177         .probe          = dw_mci_pltfm_probe,
 178         .remove         = dw_mci_pltfm_remove,
 179         .driver         = {
 180                 .name           = "dw_mmc",
 181                 .of_match_table = dw_mci_pltfm_match,
 182                 .pm             = &dw_mci_pltfm_pmops,
 183         },
 184 };
 185
 186 module_platform_driver(dw_mci_pltfm_driver);
 187
 188 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
 189 MODULE_AUTHOR("NXP Semiconductor VietNam");
 190 MODULE_AUTHOR("Imagination Technologies Ltd");
 191 MODULE_LICENSE("GPL v2");