tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * SuperH Mobile SDHI
3 *
4 * Copyright (C) 2009 Magnus Damm
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Based on "Compaq ASIC3 support":
11 *
12 * Copyright 2001 Compaq Computer Corporation.
13 * Copyright 2004-2005 Phil Blundell
14 * Copyright 2007-2008 OpenedHand Ltd.
15 *
16 * Authors: Phil Blundell <pb@handhelds.org>,
17 * Samuel Ortiz <sameo@openedhand.com>
18 *
19 */
20
21#include <linux/kernel.h>
22#include <linux/clk.h>
23#include <linux/slab.h>
24#include <linux/platform_device.h>
25#include <linux/mmc/host.h>
26#include <linux/mfd/core.h>
27#include <linux/mfd/tmio.h>
28#include <linux/mfd/sh_mobile_sdhi.h>
29#include <linux/sh_dma.h>
30
31struct sh_mobile_sdhi {
32 struct clk *clk;
33 struct tmio_mmc_data mmc_data;
34 struct mfd_cell cell_mmc;
35 struct sh_dmae_slave param_tx;
36 struct sh_dmae_slave param_rx;
37 struct tmio_mmc_dma dma_priv;
38};
39
40static struct resource sh_mobile_sdhi_resources[] = {
41 {
42 .start = 0x000,
43 .end = 0x1ff,
44 .flags = IORESOURCE_MEM,
45 },
46 {
47 .start = 0,
48 .end = 0,
49 .flags = IORESOURCE_IRQ,
50 },
51};
52
53static struct mfd_cell sh_mobile_sdhi_cell = {
54 .name = "tmio-mmc",
55 .num_resources = ARRAY_SIZE(sh_mobile_sdhi_resources),
56 .resources = sh_mobile_sdhi_resources,
57};
58
59static void sh_mobile_sdhi_set_pwr(struct platform_device *tmio, int state)
60{
61 struct platform_device *pdev = to_platform_device(tmio->dev.parent);
62 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
63
64 if (p && p->set_pwr)
65 p->set_pwr(pdev, state);
66}
67
68static int sh_mobile_sdhi_get_cd(struct platform_device *tmio)
69{
70 struct platform_device *pdev = to_platform_device(tmio->dev.parent);
71 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
72
73 if (p && p->get_cd)
74 return p->get_cd(pdev);
75 else
76 return -ENOSYS;
77}
78
79static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
80{
81 struct sh_mobile_sdhi *priv;
82 struct tmio_mmc_data *mmc_data;
83 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
84 struct resource *mem;
85 char clk_name[8];
86 int ret, irq;
87
88 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
89 if (!mem)
90 dev_err(&pdev->dev, "missing MEM resource\n");
91
92 irq = platform_get_irq(pdev, 0);
93 if (irq < 0)
94 dev_err(&pdev->dev, "missing IRQ resource\n");
95
96 if (!mem || (irq < 0))
97 return -EINVAL;
98
99 priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
100 if (priv == NULL) {
101 dev_err(&pdev->dev, "kzalloc failed\n");
102 return -ENOMEM;
103 }
104
105 mmc_data = &priv->mmc_data;
106
107 snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
108 priv->clk = clk_get(&pdev->dev, clk_name);
109 if (IS_ERR(priv->clk)) {
110 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
111 ret = PTR_ERR(priv->clk);
112 kfree(priv);
113 return ret;
114 }
115
116 clk_enable(priv->clk);
117
118 mmc_data->hclk = clk_get_rate(priv->clk);
119 mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
120 mmc_data->get_cd = sh_mobile_sdhi_get_cd;
121 mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
122 if (p) {
123 mmc_data->flags = p->tmio_flags;
124 mmc_data->ocr_mask = p->tmio_ocr_mask;
125 mmc_data->capabilities |= p->tmio_caps;
126 }
127
128 /*
129 * All SDHI blocks support 2-byte and larger block sizes in 4-bit
130 * bus width mode.
131 */
132 mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
133
134 if (p && p->dma_slave_tx >= 0 && p->dma_slave_rx >= 0) {
135 priv->param_tx.slave_id = p->dma_slave_tx;
136 priv->param_rx.slave_id = p->dma_slave_rx;
137 priv->dma_priv.chan_priv_tx = &priv->param_tx;
138 priv->dma_priv.chan_priv_rx = &priv->param_rx;
139 mmc_data->dma = &priv->dma_priv;
140 }
141
142 memcpy(&priv->cell_mmc, &sh_mobile_sdhi_cell, sizeof(priv->cell_mmc));
143 priv->cell_mmc.driver_data = mmc_data;
144 priv->cell_mmc.platform_data = &priv->cell_mmc;
145 priv->cell_mmc.data_size = sizeof(priv->cell_mmc);
146
147 platform_set_drvdata(pdev, priv);
148
149 ret = mfd_add_devices(&pdev->dev, pdev->id,
150 &priv->cell_mmc, 1, mem, irq);
151 if (ret) {
152 clk_disable(priv->clk);
153 clk_put(priv->clk);
154 kfree(priv);
155 }
156
157 return ret;
158}
159
160static int sh_mobile_sdhi_remove(struct platform_device *pdev)
161{
162 struct sh_mobile_sdhi *priv = platform_get_drvdata(pdev);
163
164 mfd_remove_devices(&pdev->dev);
165 clk_disable(priv->clk);
166 clk_put(priv->clk);
167 kfree(priv);
168
169 return 0;
170}
171
172static struct platform_driver sh_mobile_sdhi_driver = {
173 .driver = {
174 .name = "sh_mobile_sdhi",
175 .owner = THIS_MODULE,
176 },
177 .probe = sh_mobile_sdhi_probe,
178 .remove = __devexit_p(sh_mobile_sdhi_remove),
179};
180
181static int __init sh_mobile_sdhi_init(void)
182{
183 return platform_driver_register(&sh_mobile_sdhi_driver);
184}
185
186static void __exit sh_mobile_sdhi_exit(void)
187{
188 platform_driver_unregister(&sh_mobile_sdhi_driver);
189}
190
191module_init(sh_mobile_sdhi_init);
192module_exit(sh_mobile_sdhi_exit);
193
194MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
195MODULE_AUTHOR("Magnus Damm");
196MODULE_LICENSE("GPL v2");