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Linux/drivers/mmc/host/tmio_mmc.c

  1 /*
  2  * linux/drivers/mmc/host/tmio_mmc.c
  3  *
  4  * Copyright (C) 2007 Ian Molton
  5  * Copyright (C) 2004 Ian Molton
  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 version 2 as
  9  * published by the Free Software Foundation.
 10  *
 11  * Driver for the MMC / SD / SDIO cell found in:
 12  *
 13  * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
 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);
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                 tmio_mmc_host_remove(host);
136                 if (cell->disable)
137                         cell->disable(pdev);
138         }
139 
140         return 0;
141 }
142 
143 /* ------------------- device registration ----------------------- */
144 
145 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
146         SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
147         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
148                         tmio_mmc_host_runtime_resume,
149                         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");
167 

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