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 #define MAX_NUMS        10
  22 struct dw_mci_k3_priv_data {
  23         u32     clk_table[MAX_NUMS];
  24 };
  25
  26 static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  27 {
  28         struct dw_mci_k3_priv_data *priv = host->priv;
  29         u32 rate = priv->clk_table[ios->timing];
  30         int ret;
  31
  32         if (!rate) {
  33                 dev_warn(host->dev,
  34                         "no specified rate in timing %u\n", ios->timing);
  35                 return;
  36         }
  37
  38         ret = clk_set_rate(host->ciu_clk, rate);
  39         if (ret)
  40                 dev_warn(host->dev, "failed to set clock rate %uHz\n", rate);
  41
  42         host->bus_hz = clk_get_rate(host->ciu_clk);
  43 }
  44
  45 static int dw_mci_k3_parse_dt(struct dw_mci *host)
  46 {
  47         struct dw_mci_k3_priv_data *priv;
  48         struct device_node *node = host->dev->of_node;
  49         struct property *prop;
  50         const __be32 *cur;
  51         u32 val, num = 0;
  52
  53         priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
  54         if (!priv) {
  55                 dev_err(host->dev, "mem alloc failed for private data\n");
  56                 return -ENOMEM;
  57         }
  58         host->priv = priv;
  59
  60         of_property_for_each_u32(node, "clock-freq-table", prop, cur, val) {
  61                 if (num >= MAX_NUMS)
  62                         break;
  63                 priv->clk_table[num++] = val;
  64         }
  65         return 0;
  66 }
  67
  68 static const struct dw_mci_drv_data k3_drv_data = {
  69         .set_ios                = dw_mci_k3_set_ios,
  70         .parse_dt               = dw_mci_k3_parse_dt,
  71 };
  72
  73 static const struct of_device_id dw_mci_k3_match[] = {
  74         { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, },
  75         {},
  76 };
  77 MODULE_DEVICE_TABLE(of, dw_mci_k3_match);
  78
  79 static int dw_mci_k3_probe(struct platform_device *pdev)
  80 {
  81         const struct dw_mci_drv_data *drv_data;
  82         const struct of_device_id *match;
  83
  84         match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
  85         drv_data = match->data;
  86
  87         return dw_mci_pltfm_register(pdev, drv_data);
  88 }
  89
  90 static int dw_mci_k3_suspend(struct device *dev)
  91 {
  92         struct dw_mci *host = dev_get_drvdata(dev);
  93         int ret;
  94
  95         ret = dw_mci_suspend(host);
  96         if (!ret)
  97                 clk_disable_unprepare(host->ciu_clk);
  98
  99         return ret;
 100 }
 101
 102 static int dw_mci_k3_resume(struct device *dev)
 103 {
 104         struct dw_mci *host = dev_get_drvdata(dev);
 105         int ret;
 106
 107         ret = clk_prepare_enable(host->ciu_clk);
 108         if (ret) {
 109                 dev_err(host->dev, "failed to enable ciu clock\n");
 110                 return ret;
 111         }
 112
 113         return dw_mci_resume(host);
 114 }
 115
 116 static SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume);
 117
 118 static struct platform_driver dw_mci_k3_pltfm_driver = {
 119         .probe          = dw_mci_k3_probe,
 120         .remove         = dw_mci_pltfm_remove,
 121         .driver         = {
 122                 .name           = "dwmmc_k3",
 123                 .of_match_table = dw_mci_k3_match,
 124                 .pm             = &dw_mci_k3_pmops,
 125         },
 126 };
 127
 128 module_platform_driver(dw_mci_k3_pltfm_driver);
 129
 130 MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension");
 131 MODULE_LICENSE("GPL v2");
 132 MODULE_ALIAS("platform:dwmmc-k3");