drivers/mmc/host/tmio_mmc.c

   1 /*
   2  * Driver for the MMC / SD / SDIO cell found in:
   3  *
   4  * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
   5  *
   6  * Copyright (C) 2017 Renesas Electronics Corporation
   7  * Copyright (C) 2017 Horms Solutions, Simon Horman
   8  * Copyright (C) 2007 Ian Molton
   9  * Copyright (C) 2004 Ian Molton
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/device.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/mfd/tmio.h>
  19 #include <linux/mmc/host.h>
  20 #include <linux/module.h>
  21 #include <linux/pagemap.h>
  22 #include <linux/scatterlist.h>
  23
  24 #include "tmio_mmc.h"
  25
  26 #ifdef CONFIG_PM_SLEEP
  27 static int tmio_mmc_suspend(struct device *dev)
  28 {
  29         struct platform_device *pdev = to_platform_device(dev);
  30         const struct mfd_cell *cell = mfd_get_cell(pdev);
  31         int ret;
  32
  33         ret = pm_runtime_force_suspend(dev);
  34
  35         /* Tell MFD core it can disable us now.*/
  36         if (!ret && cell->disable)
  37                 cell->disable(pdev);
  38
  39         return ret;
  40 }
  41
  42 static int tmio_mmc_resume(struct device *dev)
  43 {
  44         struct platform_device *pdev = to_platform_device(dev);
  45         const struct mfd_cell *cell = mfd_get_cell(pdev);
  46         int ret = 0;
  47
  48         /* Tell the MFD core we are ready to be enabled */
  49         if (cell->resume)
  50                 ret = cell->resume(pdev);
  51
  52         if (!ret)
  53                 ret = pm_runtime_force_resume(dev);
  54
  55         return ret;
  56 }
  57 #endif
  58
  59 static int tmio_mmc_probe(struct platform_device *pdev)
  60 {
  61         const struct mfd_cell *cell = mfd_get_cell(pdev);
  62         struct tmio_mmc_data *pdata;
  63         struct tmio_mmc_host *host;
  64         struct resource *res;
  65         int ret = -EINVAL, irq;
  66
  67         if (pdev->num_resources != 2)
  68                 goto out;
  69
  70         pdata = pdev->dev.platform_data;
  71         if (!pdata || !pdata->hclk)
  72                 goto out;
  73
  74         irq = platform_get_irq(pdev, 0);
  75         if (irq < 0) {
  76                 ret = irq;
  77                 goto out;
  78         }
  79
  80         /* Tell the MFD core we are ready to be enabled */
  81         if (cell->enable) {
  82                 ret = cell->enable(pdev);
  83                 if (ret)
  84                         goto out;
  85         }
  86
  87         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  88         if (!res) {
  89                 ret = -EINVAL;
  90                 goto cell_disable;
  91         }
  92
  93         pdata->flags |= TMIO_MMC_HAVE_HIGH_REG;
  94
  95         host = tmio_mmc_host_alloc(pdev);
  96         if (!host)
  97                 goto cell_disable;
  98
  99         /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
 100         host->bus_shift = resource_size(res) >> 10;
 101
 102         ret = tmio_mmc_host_probe(host, pdata, NULL);
 103         if (ret)
 104                 goto host_free;
 105
 106         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
 107                                IRQF_TRIGGER_FALLING,
 108                                dev_name(&pdev->dev), host);
 109         if (ret)
 110                 goto host_remove;
 111
 112         pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
 113                 (unsigned long)host->ctl, irq);
 114
 115         return 0;
 116
 117 host_remove:
 118         tmio_mmc_host_remove(host);
 119 host_free:
 120         tmio_mmc_host_free(host);
 121 cell_disable:
 122         if (cell->disable)
 123                 cell->disable(pdev);
 124 out:
 125         return ret;
 126 }
 127
 128 static int tmio_mmc_remove(struct platform_device *pdev)
 129 {
 130         const struct mfd_cell *cell = mfd_get_cell(pdev);
 131         struct mmc_host *mmc = platform_get_drvdata(pdev);
 132
 133         if (mmc) {
 134                 struct tmio_mmc_host *host = mmc_priv(mmc);
 135
 136                 tmio_mmc_host_remove(host);
 137                 if (cell->disable)
 138                         cell->disable(pdev);
 139         }
 140
 141         return 0;
 142 }
 143
 144 /* ------------------- device registration ----------------------- */
 145
 146 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 147         SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
 148         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
 149                            tmio_mmc_host_runtime_resume, NULL)
 150 };
 151
 152 static struct platform_driver tmio_mmc_driver = {
 153         .driver = {
 154                 .name = "tmio-mmc",
 155                 .pm = &tmio_mmc_dev_pm_ops,
 156         },
 157         .probe = tmio_mmc_probe,
 158         .remove = tmio_mmc_remove,
 159 };
 160
 161 module_platform_driver(tmio_mmc_driver);
 162
 163 MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
 164 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
 165 MODULE_LICENSE("GPL v2");
 166 MODULE_ALIAS("platform:tmio-mmc");