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Commit | Line | Data |
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c63b3cba VK |
1 | /* |
2 | * drivers/mmc/host/sdhci-spear.c | |
3 | * | |
4 | * Support of SDHCI platform devices for spear soc family | |
5 | * | |
6 | * Copyright (C) 2010 ST Microelectronics | |
da89947b | 7 | * Viresh Kumar <vireshk@kernel.org> |
c63b3cba VK |
8 | * |
9 | * Inspired by sdhci-pltfm.c | |
10 | * | |
11 | * This file is licensed under the terms of the GNU General Public | |
12 | * License version 2. This program is licensed "as is" without any | |
13 | * warranty of any kind, whether express or implied. | |
14 | */ | |
15 | ||
16 | #include <linux/clk.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/gpio.h> | |
19 | #include <linux/highmem.h> | |
88b47679 | 20 | #include <linux/module.h> |
c63b3cba VK |
21 | #include <linux/interrupt.h> |
22 | #include <linux/irq.h> | |
067bf748 VK |
23 | #include <linux/of.h> |
24 | #include <linux/of_gpio.h> | |
c63b3cba | 25 | #include <linux/platform_device.h> |
b70a7fab | 26 | #include <linux/pm.h> |
c63b3cba VK |
27 | #include <linux/slab.h> |
28 | #include <linux/mmc/host.h> | |
b42b9b12 | 29 | #include <linux/mmc/slot-gpio.h> |
c63b3cba VK |
30 | #include <linux/io.h> |
31 | #include "sdhci.h" | |
32 | ||
33 | struct spear_sdhci { | |
34 | struct clk *clk; | |
03a6d291 | 35 | int card_int_gpio; |
c63b3cba VK |
36 | }; |
37 | ||
38 | /* sdhci ops */ | |
c915568d | 39 | static const struct sdhci_ops sdhci_pltfm_ops = { |
1771059c | 40 | .set_clock = sdhci_set_clock, |
2317f56c | 41 | .set_bus_width = sdhci_set_bus_width, |
03231f9b | 42 | .reset = sdhci_reset, |
96d7b78c | 43 | .set_uhs_signaling = sdhci_set_uhs_signaling, |
c63b3cba VK |
44 | }; |
45 | ||
03a6d291 UH |
46 | static void sdhci_probe_config_dt(struct device_node *np, |
47 | struct spear_sdhci *host) | |
067bf748 | 48 | { |
067bf748 VK |
49 | int cd_gpio; |
50 | ||
51 | cd_gpio = of_get_named_gpio(np, "cd-gpios", 0); | |
52 | if (!gpio_is_valid(cd_gpio)) | |
53 | cd_gpio = -1; | |
54 | ||
03a6d291 | 55 | host->card_int_gpio = cd_gpio; |
067bf748 | 56 | } |
067bf748 | 57 | |
c3be1efd | 58 | static int sdhci_probe(struct platform_device *pdev) |
c63b3cba VK |
59 | { |
60 | struct sdhci_host *host; | |
61 | struct resource *iomem; | |
62 | struct spear_sdhci *sdhci; | |
fcdb7c8f | 63 | struct device *dev; |
c63b3cba VK |
64 | int ret; |
65 | ||
fcdb7c8f RK |
66 | dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev; |
67 | host = sdhci_alloc_host(dev, sizeof(*sdhci)); | |
68 | if (IS_ERR(host)) { | |
69 | ret = PTR_ERR(host); | |
c63b3cba | 70 | dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n"); |
6ebaf8f2 | 71 | goto err; |
c63b3cba VK |
72 | } |
73 | ||
475d9e3e RK |
74 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
75 | host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem); | |
76 | if (IS_ERR(host->ioaddr)) { | |
77 | ret = PTR_ERR(host->ioaddr); | |
78 | dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret); | |
79 | goto err_host; | |
80 | } | |
81 | ||
82 | host->hw_name = "sdhci"; | |
83 | host->ops = &sdhci_pltfm_ops; | |
84 | host->irq = platform_get_irq(pdev, 0); | |
85 | host->quirks = SDHCI_QUIRK_BROKEN_ADMA; | |
86 | ||
fcdb7c8f RK |
87 | sdhci = sdhci_priv(host); |
88 | ||
c63b3cba | 89 | /* clk enable */ |
142dbab9 | 90 | sdhci->clk = devm_clk_get(&pdev->dev, NULL); |
c63b3cba VK |
91 | if (IS_ERR(sdhci->clk)) { |
92 | ret = PTR_ERR(sdhci->clk); | |
93 | dev_dbg(&pdev->dev, "Error getting clock\n"); | |
fcdb7c8f | 94 | goto err_host; |
c63b3cba VK |
95 | } |
96 | ||
da764f97 | 97 | ret = clk_prepare_enable(sdhci->clk); |
c63b3cba VK |
98 | if (ret) { |
99 | dev_dbg(&pdev->dev, "Error enabling clock\n"); | |
fcdb7c8f | 100 | goto err_host; |
c63b3cba VK |
101 | } |
102 | ||
257f9df1 VKS |
103 | ret = clk_set_rate(sdhci->clk, 50000000); |
104 | if (ret) | |
105 | dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n", | |
106 | clk_get_rate(sdhci->clk)); | |
107 | ||
03a6d291 | 108 | sdhci_probe_config_dt(pdev->dev.of_node, sdhci); |
b42b9b12 RK |
109 | /* |
110 | * It is optional to use GPIOs for sdhci card detection. If | |
03a6d291 | 111 | * sdhci->card_int_gpio < 0, then use original sdhci lines otherwise |
b42b9b12 RK |
112 | * GPIO lines. We use the built-in GPIO support for this. |
113 | */ | |
03a6d291 UH |
114 | if (sdhci->card_int_gpio >= 0) { |
115 | ret = mmc_gpio_request_cd(host->mmc, sdhci->card_int_gpio, 0); | |
b42b9b12 RK |
116 | if (ret < 0) { |
117 | dev_dbg(&pdev->dev, | |
118 | "failed to request card-detect gpio%d\n", | |
03a6d291 | 119 | sdhci->card_int_gpio); |
b42b9b12 RK |
120 | goto disable_clk; |
121 | } | |
122 | } | |
123 | ||
c63b3cba VK |
124 | ret = sdhci_add_host(host); |
125 | if (ret) { | |
126 | dev_dbg(&pdev->dev, "error adding host\n"); | |
fcdb7c8f | 127 | goto disable_clk; |
c63b3cba VK |
128 | } |
129 | ||
130 | platform_set_drvdata(pdev, host); | |
131 | ||
c63b3cba VK |
132 | return 0; |
133 | ||
6ebaf8f2 | 134 | disable_clk: |
da764f97 | 135 | clk_disable_unprepare(sdhci->clk); |
fcdb7c8f RK |
136 | err_host: |
137 | sdhci_free_host(host); | |
c63b3cba VK |
138 | err: |
139 | dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret); | |
140 | return ret; | |
141 | } | |
142 | ||
6e0ee714 | 143 | static int sdhci_remove(struct platform_device *pdev) |
c63b3cba VK |
144 | { |
145 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
fcdb7c8f | 146 | struct spear_sdhci *sdhci = sdhci_priv(host); |
6ebaf8f2 | 147 | int dead = 0; |
c63b3cba VK |
148 | u32 scratch; |
149 | ||
c63b3cba VK |
150 | scratch = readl(host->ioaddr + SDHCI_INT_STATUS); |
151 | if (scratch == (u32)-1) | |
152 | dead = 1; | |
153 | ||
154 | sdhci_remove_host(host, dead); | |
da764f97 | 155 | clk_disable_unprepare(sdhci->clk); |
fcdb7c8f | 156 | sdhci_free_host(host); |
c63b3cba VK |
157 | |
158 | return 0; | |
159 | } | |
160 | ||
b0dd099c | 161 | #ifdef CONFIG_PM_SLEEP |
b70a7fab VK |
162 | static int sdhci_suspend(struct device *dev) |
163 | { | |
164 | struct sdhci_host *host = dev_get_drvdata(dev); | |
fcdb7c8f | 165 | struct spear_sdhci *sdhci = sdhci_priv(host); |
b70a7fab VK |
166 | int ret; |
167 | ||
984589e5 | 168 | ret = sdhci_suspend_host(host); |
b70a7fab | 169 | if (!ret) |
06960a1b | 170 | clk_disable(sdhci->clk); |
b70a7fab VK |
171 | |
172 | return ret; | |
173 | } | |
174 | ||
175 | static int sdhci_resume(struct device *dev) | |
176 | { | |
177 | struct sdhci_host *host = dev_get_drvdata(dev); | |
fcdb7c8f | 178 | struct spear_sdhci *sdhci = sdhci_priv(host); |
b70a7fab VK |
179 | int ret; |
180 | ||
06960a1b | 181 | ret = clk_enable(sdhci->clk); |
b70a7fab VK |
182 | if (ret) { |
183 | dev_dbg(dev, "Resume: Error enabling clock\n"); | |
184 | return ret; | |
185 | } | |
186 | ||
187 | return sdhci_resume_host(host); | |
188 | } | |
b70a7fab VK |
189 | #endif |
190 | ||
4b1a6170 SH |
191 | static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume); |
192 | ||
067bf748 VK |
193 | #ifdef CONFIG_OF |
194 | static const struct of_device_id sdhci_spear_id_table[] = { | |
195 | { .compatible = "st,spear300-sdhci" }, | |
196 | {} | |
197 | }; | |
198 | MODULE_DEVICE_TABLE(of, sdhci_spear_id_table); | |
199 | #endif | |
200 | ||
c63b3cba VK |
201 | static struct platform_driver sdhci_driver = { |
202 | .driver = { | |
203 | .name = "sdhci", | |
b70a7fab | 204 | .pm = &sdhci_pm_ops, |
067bf748 | 205 | .of_match_table = of_match_ptr(sdhci_spear_id_table), |
c63b3cba VK |
206 | }, |
207 | .probe = sdhci_probe, | |
0433c143 | 208 | .remove = sdhci_remove, |
c63b3cba VK |
209 | }; |
210 | ||
d1f81a64 | 211 | module_platform_driver(sdhci_driver); |
c63b3cba VK |
212 | |
213 | MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver"); | |
da89947b | 214 | MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>"); |
c63b3cba | 215 | MODULE_LICENSE("GPL v2"); |