tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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, pdata);
96 if (IS_ERR(host)) {
97 ret = PTR_ERR(host);
98 goto cell_disable;
99 }
100
101 /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
102 host->bus_shift = resource_size(res) >> 10;
103
104 host->mmc->f_max = pdata->hclk;
105 host->mmc->f_min = pdata->hclk / 512;
106
107 ret = tmio_mmc_host_probe(host);
108 if (ret)
109 goto host_free;
110
111 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
112 IRQF_TRIGGER_FALLING,
113 dev_name(&pdev->dev), host);
114 if (ret)
115 goto host_remove;
116
117 pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
118 (unsigned long)host->ctl, irq);
119
120 return 0;
121
122host_remove:
123 tmio_mmc_host_remove(host);
124host_free:
125 tmio_mmc_host_free(host);
126cell_disable:
127 if (cell->disable)
128 cell->disable(pdev);
129out:
130 return ret;
131}
132
133static int tmio_mmc_remove(struct platform_device *pdev)
134{
135 const struct mfd_cell *cell = mfd_get_cell(pdev);
136 struct tmio_mmc_host *host = platform_get_drvdata(pdev);
137
138 tmio_mmc_host_remove(host);
139 if (cell->disable)
140 cell->disable(pdev);
141
142 return 0;
143}
144
145/* ------------------- device registration ----------------------- */
146
147static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
148 SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
149 SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
150 tmio_mmc_host_runtime_resume, NULL)
151};
152
153static struct platform_driver tmio_mmc_driver = {
154 .driver = {
155 .name = "tmio-mmc",
156 .pm = &tmio_mmc_dev_pm_ops,
157 },
158 .probe = tmio_mmc_probe,
159 .remove = tmio_mmc_remove,
160};
161
162module_platform_driver(tmio_mmc_driver);
163
164MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
165MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
166MODULE_LICENSE("GPL v2");
167MODULE_ALIAS("platform:tmio-mmc");