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> | |
30 | #include <linux/io.h> | |
31 | #include "sdhci.h" | |
32 | ||
33 | struct spear_sdhci { | |
34 | struct clk *clk; | |
35 | struct sdhci_plat_data *data; | |
36 | }; | |
37 | ||
38 | /* sdhci ops */ | |
c915568d | 39 | static const struct sdhci_ops sdhci_pltfm_ops = { |
c63b3cba VK |
40 | /* Nothing to do for now. */ |
41 | }; | |
42 | ||
43 | /* gpio card detection interrupt handler */ | |
44 | static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id) | |
45 | { | |
46 | struct platform_device *pdev = dev_id; | |
47 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
48 | struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev); | |
49 | unsigned long gpio_irq_type; | |
50 | int val; | |
51 | ||
52 | val = gpio_get_value(sdhci->data->card_int_gpio); | |
53 | ||
54 | /* val == 1 -> card removed, val == 0 -> card inserted */ | |
55 | /* if card removed - set irq for low level, else vice versa */ | |
56 | gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH; | |
dced35ae | 57 | irq_set_irq_type(irq, gpio_irq_type); |
c63b3cba VK |
58 | |
59 | if (sdhci->data->card_power_gpio >= 0) { | |
60 | if (!sdhci->data->power_always_enb) { | |
61 | /* if card inserted, give power, otherwise remove it */ | |
62 | val = sdhci->data->power_active_high ? !val : val ; | |
63 | gpio_set_value(sdhci->data->card_power_gpio, val); | |
64 | } | |
65 | } | |
66 | ||
67 | /* inform sdhci driver about card insertion/removal */ | |
68 | tasklet_schedule(&host->card_tasklet); | |
69 | ||
70 | return IRQ_HANDLED; | |
71 | } | |
72 | ||
067bf748 | 73 | #ifdef CONFIG_OF |
c3be1efd | 74 | static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev) |
067bf748 VK |
75 | { |
76 | struct device_node *np = pdev->dev.of_node; | |
77 | struct sdhci_plat_data *pdata = NULL; | |
78 | int cd_gpio; | |
79 | ||
80 | cd_gpio = of_get_named_gpio(np, "cd-gpios", 0); | |
81 | if (!gpio_is_valid(cd_gpio)) | |
82 | cd_gpio = -1; | |
83 | ||
84 | /* If pdata is required */ | |
85 | if (cd_gpio != -1) { | |
86 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
eab36b24 | 87 | if (!pdata) |
067bf748 | 88 | dev_err(&pdev->dev, "DT: kzalloc failed\n"); |
eab36b24 SK |
89 | else |
90 | pdata->card_int_gpio = cd_gpio; | |
067bf748 VK |
91 | } |
92 | ||
067bf748 VK |
93 | return pdata; |
94 | } | |
95 | #else | |
c3be1efd | 96 | static struct sdhci_plat_data *sdhci_probe_config_dt(struct platform_device *pdev) |
067bf748 VK |
97 | { |
98 | return ERR_PTR(-ENOSYS); | |
99 | } | |
100 | #endif | |
101 | ||
c3be1efd | 102 | static int sdhci_probe(struct platform_device *pdev) |
c63b3cba | 103 | { |
067bf748 | 104 | struct device_node *np = pdev->dev.of_node; |
c63b3cba VK |
105 | struct sdhci_host *host; |
106 | struct resource *iomem; | |
107 | struct spear_sdhci *sdhci; | |
fcdb7c8f | 108 | struct device *dev; |
c63b3cba VK |
109 | int ret; |
110 | ||
c63b3cba VK |
111 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
112 | if (!iomem) { | |
113 | ret = -ENOMEM; | |
114 | dev_dbg(&pdev->dev, "memory resource not defined\n"); | |
115 | goto err; | |
116 | } | |
117 | ||
6ebaf8f2 VK |
118 | if (!devm_request_mem_region(&pdev->dev, iomem->start, |
119 | resource_size(iomem), "spear-sdhci")) { | |
c63b3cba VK |
120 | ret = -EBUSY; |
121 | dev_dbg(&pdev->dev, "cannot request region\n"); | |
122 | goto err; | |
123 | } | |
124 | ||
fcdb7c8f RK |
125 | dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev; |
126 | host = sdhci_alloc_host(dev, sizeof(*sdhci)); | |
127 | if (IS_ERR(host)) { | |
128 | ret = PTR_ERR(host); | |
c63b3cba | 129 | dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n"); |
6ebaf8f2 | 130 | goto err; |
c63b3cba VK |
131 | } |
132 | ||
fcdb7c8f RK |
133 | sdhci = sdhci_priv(host); |
134 | ||
c63b3cba | 135 | /* clk enable */ |
142dbab9 | 136 | sdhci->clk = devm_clk_get(&pdev->dev, NULL); |
c63b3cba VK |
137 | if (IS_ERR(sdhci->clk)) { |
138 | ret = PTR_ERR(sdhci->clk); | |
139 | dev_dbg(&pdev->dev, "Error getting clock\n"); | |
fcdb7c8f | 140 | goto err_host; |
c63b3cba VK |
141 | } |
142 | ||
da764f97 | 143 | ret = clk_prepare_enable(sdhci->clk); |
c63b3cba VK |
144 | if (ret) { |
145 | dev_dbg(&pdev->dev, "Error enabling clock\n"); | |
fcdb7c8f | 146 | goto err_host; |
c63b3cba VK |
147 | } |
148 | ||
257f9df1 VKS |
149 | ret = clk_set_rate(sdhci->clk, 50000000); |
150 | if (ret) | |
151 | dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n", | |
152 | clk_get_rate(sdhci->clk)); | |
153 | ||
067bf748 VK |
154 | if (np) { |
155 | sdhci->data = sdhci_probe_config_dt(pdev); | |
156 | if (IS_ERR(sdhci->data)) { | |
157 | dev_err(&pdev->dev, "DT: Failed to get pdata\n"); | |
142dbab9 | 158 | goto disable_clk; |
067bf748 VK |
159 | } |
160 | } else { | |
161 | sdhci->data = dev_get_platdata(&pdev->dev); | |
162 | } | |
163 | ||
c63b3cba VK |
164 | host->hw_name = "sdhci"; |
165 | host->ops = &sdhci_pltfm_ops; | |
166 | host->irq = platform_get_irq(pdev, 0); | |
167 | host->quirks = SDHCI_QUIRK_BROKEN_ADMA; | |
168 | ||
6ebaf8f2 VK |
169 | host->ioaddr = devm_ioremap(&pdev->dev, iomem->start, |
170 | resource_size(iomem)); | |
c63b3cba VK |
171 | if (!host->ioaddr) { |
172 | ret = -ENOMEM; | |
173 | dev_dbg(&pdev->dev, "failed to remap registers\n"); | |
fcdb7c8f | 174 | goto disable_clk; |
c63b3cba VK |
175 | } |
176 | ||
177 | ret = sdhci_add_host(host); | |
178 | if (ret) { | |
179 | dev_dbg(&pdev->dev, "error adding host\n"); | |
fcdb7c8f | 180 | goto disable_clk; |
c63b3cba VK |
181 | } |
182 | ||
183 | platform_set_drvdata(pdev, host); | |
184 | ||
185 | /* | |
186 | * It is optional to use GPIOs for sdhci Power control & sdhci card | |
187 | * interrupt detection. If sdhci->data is NULL, then use original sdhci | |
188 | * lines otherwise GPIO lines. | |
189 | * If GPIO is selected for power control, then power should be disabled | |
190 | * after card removal and should be enabled when card insertion | |
191 | * interrupt occurs | |
192 | */ | |
193 | if (!sdhci->data) | |
194 | return 0; | |
195 | ||
196 | if (sdhci->data->card_power_gpio >= 0) { | |
197 | int val = 0; | |
198 | ||
6ebaf8f2 VK |
199 | ret = devm_gpio_request(&pdev->dev, |
200 | sdhci->data->card_power_gpio, "sdhci"); | |
c63b3cba VK |
201 | if (ret < 0) { |
202 | dev_dbg(&pdev->dev, "gpio request fail: %d\n", | |
203 | sdhci->data->card_power_gpio); | |
6ebaf8f2 | 204 | goto set_drvdata; |
c63b3cba VK |
205 | } |
206 | ||
207 | if (sdhci->data->power_always_enb) | |
208 | val = sdhci->data->power_active_high; | |
209 | else | |
210 | val = !sdhci->data->power_active_high; | |
211 | ||
212 | ret = gpio_direction_output(sdhci->data->card_power_gpio, val); | |
213 | if (ret) { | |
214 | dev_dbg(&pdev->dev, "gpio set direction fail: %d\n", | |
215 | sdhci->data->card_power_gpio); | |
6ebaf8f2 | 216 | goto set_drvdata; |
c63b3cba | 217 | } |
c63b3cba VK |
218 | } |
219 | ||
220 | if (sdhci->data->card_int_gpio >= 0) { | |
6ebaf8f2 VK |
221 | ret = devm_gpio_request(&pdev->dev, sdhci->data->card_int_gpio, |
222 | "sdhci"); | |
c63b3cba VK |
223 | if (ret < 0) { |
224 | dev_dbg(&pdev->dev, "gpio request fail: %d\n", | |
225 | sdhci->data->card_int_gpio); | |
6ebaf8f2 | 226 | goto set_drvdata; |
c63b3cba VK |
227 | } |
228 | ||
229 | ret = gpio_direction_input(sdhci->data->card_int_gpio); | |
230 | if (ret) { | |
231 | dev_dbg(&pdev->dev, "gpio set direction fail: %d\n", | |
232 | sdhci->data->card_int_gpio); | |
6ebaf8f2 | 233 | goto set_drvdata; |
c63b3cba | 234 | } |
6ebaf8f2 VK |
235 | ret = devm_request_irq(&pdev->dev, |
236 | gpio_to_irq(sdhci->data->card_int_gpio), | |
c63b3cba VK |
237 | sdhci_gpio_irq, IRQF_TRIGGER_LOW, |
238 | mmc_hostname(host->mmc), pdev); | |
239 | if (ret) { | |
240 | dev_dbg(&pdev->dev, "gpio request irq fail: %d\n", | |
241 | sdhci->data->card_int_gpio); | |
6ebaf8f2 | 242 | goto set_drvdata; |
c63b3cba VK |
243 | } |
244 | ||
245 | } | |
246 | ||
247 | return 0; | |
248 | ||
6ebaf8f2 | 249 | set_drvdata: |
c63b3cba | 250 | sdhci_remove_host(host, 1); |
6ebaf8f2 | 251 | disable_clk: |
da764f97 | 252 | clk_disable_unprepare(sdhci->clk); |
fcdb7c8f RK |
253 | err_host: |
254 | sdhci_free_host(host); | |
c63b3cba VK |
255 | err: |
256 | dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret); | |
257 | return ret; | |
258 | } | |
259 | ||
6e0ee714 | 260 | static int sdhci_remove(struct platform_device *pdev) |
c63b3cba VK |
261 | { |
262 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
fcdb7c8f | 263 | struct spear_sdhci *sdhci = sdhci_priv(host); |
6ebaf8f2 | 264 | int dead = 0; |
c63b3cba VK |
265 | u32 scratch; |
266 | ||
c63b3cba VK |
267 | scratch = readl(host->ioaddr + SDHCI_INT_STATUS); |
268 | if (scratch == (u32)-1) | |
269 | dead = 1; | |
270 | ||
271 | sdhci_remove_host(host, dead); | |
da764f97 | 272 | clk_disable_unprepare(sdhci->clk); |
fcdb7c8f | 273 | sdhci_free_host(host); |
c63b3cba VK |
274 | |
275 | return 0; | |
276 | } | |
277 | ||
b0dd099c | 278 | #ifdef CONFIG_PM_SLEEP |
b70a7fab VK |
279 | static int sdhci_suspend(struct device *dev) |
280 | { | |
281 | struct sdhci_host *host = dev_get_drvdata(dev); | |
fcdb7c8f | 282 | struct spear_sdhci *sdhci = sdhci_priv(host); |
b70a7fab VK |
283 | int ret; |
284 | ||
984589e5 | 285 | ret = sdhci_suspend_host(host); |
b70a7fab | 286 | if (!ret) |
06960a1b | 287 | clk_disable(sdhci->clk); |
b70a7fab VK |
288 | |
289 | return ret; | |
290 | } | |
291 | ||
292 | static int sdhci_resume(struct device *dev) | |
293 | { | |
294 | struct sdhci_host *host = dev_get_drvdata(dev); | |
fcdb7c8f | 295 | struct spear_sdhci *sdhci = sdhci_priv(host); |
b70a7fab VK |
296 | int ret; |
297 | ||
06960a1b | 298 | ret = clk_enable(sdhci->clk); |
b70a7fab VK |
299 | if (ret) { |
300 | dev_dbg(dev, "Resume: Error enabling clock\n"); | |
301 | return ret; | |
302 | } | |
303 | ||
304 | return sdhci_resume_host(host); | |
305 | } | |
b70a7fab VK |
306 | #endif |
307 | ||
4b1a6170 SH |
308 | static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume); |
309 | ||
067bf748 VK |
310 | #ifdef CONFIG_OF |
311 | static const struct of_device_id sdhci_spear_id_table[] = { | |
312 | { .compatible = "st,spear300-sdhci" }, | |
313 | {} | |
314 | }; | |
315 | MODULE_DEVICE_TABLE(of, sdhci_spear_id_table); | |
316 | #endif | |
317 | ||
c63b3cba VK |
318 | static struct platform_driver sdhci_driver = { |
319 | .driver = { | |
320 | .name = "sdhci", | |
321 | .owner = THIS_MODULE, | |
b70a7fab | 322 | .pm = &sdhci_pm_ops, |
067bf748 | 323 | .of_match_table = of_match_ptr(sdhci_spear_id_table), |
c63b3cba VK |
324 | }, |
325 | .probe = sdhci_probe, | |
0433c143 | 326 | .remove = sdhci_remove, |
c63b3cba VK |
327 | }; |
328 | ||
d1f81a64 | 329 | module_platform_driver(sdhci_driver); |
c63b3cba VK |
330 | |
331 | MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver"); | |
10d8935f | 332 | MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>"); |
c63b3cba | 333 | MODULE_LICENSE("GPL v2"); |