LXR linux/drivers/mmc/host/tmio

   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
  27static 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
  42static 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
  59static 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
 117host_remove:
 118        tmio_mmc_host_remove(host);
 119host_free:
 120        tmio_mmc_host_free(host);
 121cell_disable:
 122        if (cell->disable)
 123                cell->disable(pdev);
 124out:
 125        return ret;
 126}
 127
 128static 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
 146static 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
 152static 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
 161module_platform_driver(tmio_mmc_driver);
 162
 163MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
 164MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
 165MODULE_LICENSE("GPL v2");
 166MODULE_ALIAS("platform:tmio-mmc");
 167