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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 | |
10d8935f | 7 | * Viresh Kumar <viresh.linux@gmail.com> |
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> | |
29 | #include <linux/mmc/sdhci-spear.h> | |
b42b9b12 | 30 | #include <linux/mmc/slot-gpio.h> |
c63b3cba VK |
31 | #include <linux/io.h> |
32 | #include "sdhci.h" | |
33 | ||
34 | struct spear_sdhci { | |
35 | struct clk *clk; | |
36 | struct sdhci_plat_data *data; | |
37 | }; | |
38 | ||
39 | /* sdhci ops */ | |
c915568d | 40 | static const struct sdhci_ops sdhci_pltfm_ops = { |
1771059c | 41 | .set_clock = sdhci_set_clock, |
2317f56c | 42 | .set_bus_width = sdhci_set_bus_width, |
03231f9b | 43 | .reset = sdhci_reset, |
96d7b78c | 44 | .set_uhs_signaling = sdhci_set_uhs_signaling, |
c63b3cba VK |
45 | }; |
46 | ||
067bf748 | 47 | #ifdef CONFIG_OF |
c3be1efd | 48 | static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev) |
067bf748 VK |
49 | { |
50 | struct device_node *np = pdev->dev.of_node; | |
51 | struct sdhci_plat_data *pdata = NULL; | |
52 | int cd_gpio; | |
53 | ||
54 | cd_gpio = of_get_named_gpio(np, "cd-gpios", 0); | |
55 | if (!gpio_is_valid(cd_gpio)) | |
56 | cd_gpio = -1; | |
57 | ||
58 | /* If pdata is required */ | |
59 | if (cd_gpio != -1) { | |
60 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
eab36b24 | 61 | if (!pdata) |
067bf748 | 62 | dev_err(&pdev->dev, "DT: kzalloc failed\n"); |
eab36b24 SK |
63 | else |
64 | pdata->card_int_gpio = cd_gpio; | |
067bf748 VK |
65 | } |
66 | ||
067bf748 VK |
67 | return pdata; |
68 | } | |
69 | #else | |
c3be1efd | 70 | static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev) |
067bf748 VK |
71 | { |
72 | return ERR_PTR(-ENOSYS); | |
73 | } | |
74 | #endif | |
75 | ||
c3be1efd | 76 | static int sdhci_probe(struct platform_device *pdev) |
c63b3cba | 77 | { |
067bf748 | 78 | struct device_node *np = pdev->dev.of_node; |
c63b3cba VK |
79 | struct sdhci_host *host; |
80 | struct resource *iomem; | |
81 | struct spear_sdhci *sdhci; | |
fcdb7c8f | 82 | struct device *dev; |
c63b3cba VK |
83 | int ret; |
84 | ||
fcdb7c8f RK |
85 | dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev; |
86 | host = sdhci_alloc_host(dev, sizeof(*sdhci)); | |
87 | if (IS_ERR(host)) { | |
88 | ret = PTR_ERR(host); | |
c63b3cba | 89 | dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n"); |
6ebaf8f2 | 90 | goto err; |
c63b3cba VK |
91 | } |
92 | ||
475d9e3e RK |
93 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
94 | host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem); | |
95 | if (IS_ERR(host->ioaddr)) { | |
96 | ret = PTR_ERR(host->ioaddr); | |
97 | dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret); | |
98 | goto err_host; | |
99 | } | |
100 | ||
101 | host->hw_name = "sdhci"; | |
102 | host->ops = &sdhci_pltfm_ops; | |
103 | host->irq = platform_get_irq(pdev, 0); | |
104 | host->quirks = SDHCI_QUIRK_BROKEN_ADMA; | |
105 | ||
fcdb7c8f RK |
106 | sdhci = sdhci_priv(host); |
107 | ||
c63b3cba | 108 | /* clk enable */ |
142dbab9 | 109 | sdhci->clk = devm_clk_get(&pdev->dev, NULL); |
c63b3cba VK |
110 | if (IS_ERR(sdhci->clk)) { |
111 | ret = PTR_ERR(sdhci->clk); | |
112 | dev_dbg(&pdev->dev, "Error getting clock\n"); | |
fcdb7c8f | 113 | goto err_host; |
c63b3cba VK |
114 | } |
115 | ||
da764f97 | 116 | ret = clk_prepare_enable(sdhci->clk); |
c63b3cba VK |
117 | if (ret) { |
118 | dev_dbg(&pdev->dev, "Error enabling clock\n"); | |
fcdb7c8f | 119 | goto err_host; |
c63b3cba VK |
120 | } |
121 | ||
257f9df1 VKS |
122 | ret = clk_set_rate(sdhci->clk, 50000000); |
123 | if (ret) | |
124 | dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n", | |
125 | clk_get_rate(sdhci->clk)); | |
126 | ||
067bf748 VK |
127 | if (np) { |
128 | sdhci->data = sdhci_probe_config_dt(pdev); | |
129 | if (IS_ERR(sdhci->data)) { | |
130 | dev_err(&pdev->dev, "DT: Failed to get pdata\n"); | |
142dbab9 | 131 | goto disable_clk; |
067bf748 VK |
132 | } |
133 | } else { | |
134 | sdhci->data = dev_get_platdata(&pdev->dev); | |
135 | } | |
136 | ||
b42b9b12 RK |
137 | /* |
138 | * It is optional to use GPIOs for sdhci card detection. If | |
139 | * sdhci->data is NULL, then use original sdhci lines otherwise | |
140 | * GPIO lines. We use the built-in GPIO support for this. | |
141 | */ | |
142 | if (sdhci->data && sdhci->data->card_int_gpio >= 0) { | |
143 | ret = mmc_gpio_request_cd(host->mmc, | |
144 | sdhci->data->card_int_gpio, 0); | |
145 | if (ret < 0) { | |
146 | dev_dbg(&pdev->dev, | |
147 | "failed to request card-detect gpio%d\n", | |
148 | sdhci->data->card_int_gpio); | |
149 | goto disable_clk; | |
150 | } | |
151 | } | |
152 | ||
c63b3cba VK |
153 | ret = sdhci_add_host(host); |
154 | if (ret) { | |
155 | dev_dbg(&pdev->dev, "error adding host\n"); | |
fcdb7c8f | 156 | goto disable_clk; |
c63b3cba VK |
157 | } |
158 | ||
159 | platform_set_drvdata(pdev, host); | |
160 | ||
c63b3cba VK |
161 | return 0; |
162 | ||
6ebaf8f2 | 163 | disable_clk: |
da764f97 | 164 | clk_disable_unprepare(sdhci->clk); |
fcdb7c8f RK |
165 | err_host: |
166 | sdhci_free_host(host); | |
c63b3cba VK |
167 | err: |
168 | dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret); | |
169 | return ret; | |
170 | } | |
171 | ||
6e0ee714 | 172 | static int sdhci_remove(struct platform_device *pdev) |
c63b3cba VK |
173 | { |
174 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
fcdb7c8f | 175 | struct spear_sdhci *sdhci = sdhci_priv(host); |
6ebaf8f2 | 176 | int dead = 0; |
c63b3cba VK |
177 | u32 scratch; |
178 | ||
c63b3cba VK |
179 | scratch = readl(host->ioaddr + SDHCI_INT_STATUS); |
180 | if (scratch == (u32)-1) | |
181 | dead = 1; | |
182 | ||
183 | sdhci_remove_host(host, dead); | |
da764f97 | 184 | clk_disable_unprepare(sdhci->clk); |
fcdb7c8f | 185 | sdhci_free_host(host); |
c63b3cba VK |
186 | |
187 | return 0; | |
188 | } | |
189 | ||
b0dd099c | 190 | #ifdef CONFIG_PM_SLEEP |
b70a7fab VK |
191 | static int sdhci_suspend(struct device *dev) |
192 | { | |
193 | struct sdhci_host *host = dev_get_drvdata(dev); | |
fcdb7c8f | 194 | struct spear_sdhci *sdhci = sdhci_priv(host); |
b70a7fab VK |
195 | int ret; |
196 | ||
984589e5 | 197 | ret = sdhci_suspend_host(host); |
b70a7fab | 198 | if (!ret) |
06960a1b | 199 | clk_disable(sdhci->clk); |
b70a7fab VK |
200 | |
201 | return ret; | |
202 | } | |
203 | ||
204 | static int sdhci_resume(struct device *dev) | |
205 | { | |
206 | struct sdhci_host *host = dev_get_drvdata(dev); | |
fcdb7c8f | 207 | struct spear_sdhci *sdhci = sdhci_priv(host); |
b70a7fab VK |
208 | int ret; |
209 | ||
06960a1b | 210 | ret = clk_enable(sdhci->clk); |
b70a7fab VK |
211 | if (ret) { |
212 | dev_dbg(dev, "Resume: Error enabling clock\n"); | |
213 | return ret; | |
214 | } | |
215 | ||
216 | return sdhci_resume_host(host); | |
217 | } | |
b70a7fab VK |
218 | #endif |
219 | ||
4b1a6170 SH |
220 | static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume); |
221 | ||
067bf748 VK |
222 | #ifdef CONFIG_OF |
223 | static const struct of_device_id sdhci_spear_id_table[] = { | |
224 | { .compatible = "st,spear300-sdhci" }, | |
225 | {} | |
226 | }; | |
227 | MODULE_DEVICE_TABLE(of, sdhci_spear_id_table); | |
228 | #endif | |
229 | ||
c63b3cba VK |
230 | static struct platform_driver sdhci_driver = { |
231 | .driver = { | |
232 | .name = "sdhci", | |
233 | .owner = THIS_MODULE, | |
b70a7fab | 234 | .pm = &sdhci_pm_ops, |
067bf748 | 235 | .of_match_table = of_match_ptr(sdhci_spear_id_table), |
c63b3cba VK |
236 | }, |
237 | .probe = sdhci_probe, | |
0433c143 | 238 | .remove = sdhci_remove, |
c63b3cba VK |
239 | }; |
240 | ||
d1f81a64 | 241 | module_platform_driver(sdhci_driver); |
c63b3cba VK |
242 | |
243 | MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver"); | |
10d8935f | 244 | MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>"); |
c63b3cba | 245 | MODULE_LICENSE("GPL v2"); |