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1 | /* |
2 | * SDHCI support for SiRF primaII and marco SoCs | |
3 | * | |
4 | * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. | |
5 | * | |
6 | * Licensed under GPLv2 or later. | |
7 | */ | |
8 | ||
9 | #include <linux/delay.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/mmc/host.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/of.h> | |
14 | #include <linux/of_gpio.h> | |
15 | #include <linux/mmc/slot-gpio.h> | |
b3b665b0 BS |
16 | #include "sdhci-pltfm.h" |
17 | ||
18 | struct sdhci_sirf_priv { | |
19 | struct clk *clk; | |
20 | int gpio_cd; | |
21 | }; | |
22 | ||
23 | static unsigned int sdhci_sirf_get_max_clk(struct sdhci_host *host) | |
24 | { | |
25 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
e2f6aac6 | 26 | struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host); |
b3b665b0 BS |
27 | return clk_get_rate(priv->clk); |
28 | } | |
29 | ||
30 | static struct sdhci_ops sdhci_sirf_ops = { | |
31 | .get_max_clock = sdhci_sirf_get_max_clk, | |
32 | }; | |
33 | ||
34 | static struct sdhci_pltfm_data sdhci_sirf_pdata = { | |
35 | .ops = &sdhci_sirf_ops, | |
36 | .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | | |
37 | SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK | | |
38 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN | | |
39 | SDHCI_QUIRK_INVERTED_WRITE_PROTECT | | |
40 | SDHCI_QUIRK_DELAY_AFTER_POWER, | |
41 | }; | |
42 | ||
43 | static int sdhci_sirf_probe(struct platform_device *pdev) | |
44 | { | |
45 | struct sdhci_host *host; | |
46 | struct sdhci_pltfm_host *pltfm_host; | |
47 | struct sdhci_sirf_priv *priv; | |
e2f6aac6 AB |
48 | struct clk *clk; |
49 | int gpio_cd; | |
b3b665b0 | 50 | int ret; |
b3b665b0 | 51 | |
e2f6aac6 AB |
52 | clk = devm_clk_get(&pdev->dev, NULL); |
53 | if (IS_ERR(clk)) { | |
b3b665b0 | 54 | dev_err(&pdev->dev, "unable to get clock"); |
e2f6aac6 | 55 | return PTR_ERR(clk); |
b3b665b0 BS |
56 | } |
57 | ||
e2f6aac6 AB |
58 | if (pdev->dev.of_node) |
59 | gpio_cd = of_get_named_gpio(pdev->dev.of_node, "cd-gpios", 0); | |
60 | else | |
61 | gpio_cd = -EINVAL; | |
b3b665b0 | 62 | |
e2f6aac6 AB |
63 | host = sdhci_pltfm_init(pdev, &sdhci_sirf_pdata, sizeof(struct sdhci_sirf_priv)); |
64 | if (IS_ERR(host)) | |
65 | return PTR_ERR(host); | |
b3b665b0 BS |
66 | |
67 | pltfm_host = sdhci_priv(host); | |
e2f6aac6 AB |
68 | priv = sdhci_pltfm_priv(pltfm_host); |
69 | priv->clk = clk; | |
70 | priv->gpio_cd = gpio_cd; | |
b3b665b0 BS |
71 | |
72 | sdhci_get_of_property(pdev); | |
73 | ||
e2f6aac6 AB |
74 | ret = clk_prepare_enable(priv->clk); |
75 | if (ret) | |
76 | goto err_clk_prepare; | |
b3b665b0 BS |
77 | |
78 | ret = sdhci_add_host(host); | |
79 | if (ret) | |
80 | goto err_sdhci_add; | |
81 | ||
82 | /* | |
83 | * We must request the IRQ after sdhci_add_host(), as the tasklet only | |
84 | * gets setup in sdhci_add_host() and we oops. | |
85 | */ | |
86 | if (gpio_is_valid(priv->gpio_cd)) { | |
87 | ret = mmc_gpio_request_cd(host->mmc, priv->gpio_cd); | |
88 | if (ret) { | |
89 | dev_err(&pdev->dev, "card detect irq request failed: %d\n", | |
90 | ret); | |
91 | goto err_request_cd; | |
92 | } | |
93 | } | |
94 | ||
95 | return 0; | |
96 | ||
97 | err_request_cd: | |
98 | sdhci_remove_host(host, 0); | |
99 | err_sdhci_add: | |
100 | clk_disable_unprepare(priv->clk); | |
e2f6aac6 | 101 | err_clk_prepare: |
b3b665b0 | 102 | sdhci_pltfm_free(pdev); |
b3b665b0 BS |
103 | return ret; |
104 | } | |
105 | ||
106 | static int sdhci_sirf_remove(struct platform_device *pdev) | |
107 | { | |
108 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
109 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
e2f6aac6 | 110 | struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host); |
b3b665b0 BS |
111 | |
112 | sdhci_pltfm_unregister(pdev); | |
113 | ||
114 | if (gpio_is_valid(priv->gpio_cd)) | |
115 | mmc_gpio_free_cd(host->mmc); | |
116 | ||
117 | clk_disable_unprepare(priv->clk); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | #ifdef CONFIG_PM_SLEEP | |
122 | static int sdhci_sirf_suspend(struct device *dev) | |
123 | { | |
124 | struct sdhci_host *host = dev_get_drvdata(dev); | |
125 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
e2f6aac6 | 126 | struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host); |
b3b665b0 BS |
127 | int ret; |
128 | ||
129 | ret = sdhci_suspend_host(host); | |
130 | if (ret) | |
131 | return ret; | |
132 | ||
133 | clk_disable(priv->clk); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int sdhci_sirf_resume(struct device *dev) | |
139 | { | |
140 | struct sdhci_host *host = dev_get_drvdata(dev); | |
141 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
e2f6aac6 | 142 | struct sdhci_sirf_priv *priv = sdhci_pltfm_priv(pltfm_host); |
b3b665b0 BS |
143 | int ret; |
144 | ||
145 | ret = clk_enable(priv->clk); | |
146 | if (ret) { | |
147 | dev_dbg(dev, "Resume: Error enabling clock\n"); | |
148 | return ret; | |
149 | } | |
150 | ||
151 | return sdhci_resume_host(host); | |
152 | } | |
153 | ||
154 | static SIMPLE_DEV_PM_OPS(sdhci_sirf_pm_ops, sdhci_sirf_suspend, sdhci_sirf_resume); | |
155 | #endif | |
156 | ||
157 | static const struct of_device_id sdhci_sirf_of_match[] = { | |
158 | { .compatible = "sirf,prima2-sdhc" }, | |
159 | { } | |
160 | }; | |
161 | MODULE_DEVICE_TABLE(of, sdhci_sirf_of_match); | |
162 | ||
163 | static struct platform_driver sdhci_sirf_driver = { | |
164 | .driver = { | |
165 | .name = "sdhci-sirf", | |
166 | .owner = THIS_MODULE, | |
167 | .of_match_table = sdhci_sirf_of_match, | |
168 | #ifdef CONFIG_PM_SLEEP | |
169 | .pm = &sdhci_sirf_pm_ops, | |
170 | #endif | |
171 | }, | |
172 | .probe = sdhci_sirf_probe, | |
173 | .remove = sdhci_sirf_remove, | |
174 | }; | |
175 | ||
176 | module_platform_driver(sdhci_sirf_driver); | |
177 | ||
178 | MODULE_DESCRIPTION("SDHCI driver for SiRFprimaII/SiRFmarco"); | |
179 | MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); | |
180 | MODULE_LICENSE("GPL v2"); |