kernel/drivers/mmc/host/dw_mmc-k3.c

   1 /*
   2  * Copyright (c) 2013 Linaro Ltd.
   3  * Copyright (c) 2013 Hisilicon Limited.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/clk.h>
  14 #include <linux/mmc/host.h>
  15 #include <linux/mmc/dw_mmc.h>
  16 #include <linux/of_address.h>
  17
  18 #include "dw_mmc.h"
  19 #include "dw_mmc-pltfm.h"
  20
  21 static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  22 {
  23         int ret;
  24
  25         ret = clk_set_rate(host->ciu_clk, ios->clock);
  26         if (ret)
  27                 dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
  28
  29         host->bus_hz = clk_get_rate(host->ciu_clk);
  30 }
  31
  32 static const struct dw_mci_drv_data k3_drv_data = {
  33         .set_ios                = dw_mci_k3_set_ios,
  34 };
  35
  36 static const struct of_device_id dw_mci_k3_match[] = {
  37         { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
  38         {},
  39 };
  40 MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
  41
  42 static int dw_mci_k3_probe(struct platform_device *pdev)
  43 {
  44         const struct dw_mci_drv_data *drv_data;
  45         const struct of_device_id *match;
  46
  47         match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
  48         drv_data = match->data;
  49
  50         return dw_mci_pltfm_register(pdev, drv_data);
  51 }
  52
  53 #ifdef CONFIG_PM_SLEEP
  54 static int dw_mci_k3_suspend(struct device *dev)
  55 {
  56         struct dw_mci *host = dev_get_drvdata(dev);
  57         int ret;
  58
  59         ret = dw_mci_suspend(host);
  60         if (!ret)
  61                 clk_disable_unprepare(host->ciu_clk);
  62
  63         return ret;
  64 }
  65
  66 static int dw_mci_k3_resume(struct device *dev)
  67 {
  68         struct dw_mci *host = dev_get_drvdata(dev);
  69         int ret;
  70
  71         ret = clk_prepare_enable(host->ciu_clk);
  72         if (ret) {
  73                 dev_err(host->dev, "failed to enable ciu clock\n");
  74                 return ret;
  75         }
  76
  77         return dw_mci_resume(host);
  78 }
  79 #endif /* CONFIG_PM_SLEEP */
  80
  81 static SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume);
  82
  83 static struct platform_driver dw_mci_k3_pltfm_driver = {
  84         .probe          = dw_mci_k3_probe,
  85         .remove         = dw_mci_pltfm_remove,
  86         .driver         = {
  87                 .name           = "dwmmc_k3",
  88                 .of_match_table = dw_mci_k3_match,
  89                 .pm             = &dw_mci_k3_pmops,
  90         },
  91 };
  92
  93 module_platform_driver(dw_mci_k3_pltfm_driver);
  94
  95 MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
  96 MODULE_LICENSE("GPL v2");
  97 MODULE_ALIAS("platform:dwmmc-k3");