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