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> | |
23 | #include <linux/platform_device.h> | |
b70a7fab | 24 | #include <linux/pm.h> |
c63b3cba VK |
25 | #include <linux/slab.h> |
26 | #include <linux/mmc/host.h> | |
27 | #include <linux/mmc/sdhci-spear.h> | |
28 | #include <linux/io.h> | |
29 | #include "sdhci.h" | |
30 | ||
31 | struct spear_sdhci { | |
32 | struct clk *clk; | |
33 | struct sdhci_plat_data *data; | |
34 | }; | |
35 | ||
36 | /* sdhci ops */ | |
37 | static struct sdhci_ops sdhci_pltfm_ops = { | |
38 | /* Nothing to do for now. */ | |
39 | }; | |
40 | ||
41 | /* gpio card detection interrupt handler */ | |
42 | static irqreturn_t sdhci_gpio_irq(int irq, void *dev_id) | |
43 | { | |
44 | struct platform_device *pdev = dev_id; | |
45 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
46 | struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev); | |
47 | unsigned long gpio_irq_type; | |
48 | int val; | |
49 | ||
50 | val = gpio_get_value(sdhci->data->card_int_gpio); | |
51 | ||
52 | /* val == 1 -> card removed, val == 0 -> card inserted */ | |
53 | /* if card removed - set irq for low level, else vice versa */ | |
54 | gpio_irq_type = val ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH; | |
dced35ae | 55 | irq_set_irq_type(irq, gpio_irq_type); |
c63b3cba VK |
56 | |
57 | if (sdhci->data->card_power_gpio >= 0) { | |
58 | if (!sdhci->data->power_always_enb) { | |
59 | /* if card inserted, give power, otherwise remove it */ | |
60 | val = sdhci->data->power_active_high ? !val : val ; | |
61 | gpio_set_value(sdhci->data->card_power_gpio, val); | |
62 | } | |
63 | } | |
64 | ||
65 | /* inform sdhci driver about card insertion/removal */ | |
66 | tasklet_schedule(&host->card_tasklet); | |
67 | ||
68 | return IRQ_HANDLED; | |
69 | } | |
70 | ||
71 | static int __devinit sdhci_probe(struct platform_device *pdev) | |
72 | { | |
73 | struct sdhci_host *host; | |
74 | struct resource *iomem; | |
75 | struct spear_sdhci *sdhci; | |
76 | int ret; | |
77 | ||
c63b3cba VK |
78 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
79 | if (!iomem) { | |
80 | ret = -ENOMEM; | |
81 | dev_dbg(&pdev->dev, "memory resource not defined\n"); | |
82 | goto err; | |
83 | } | |
84 | ||
6ebaf8f2 VK |
85 | if (!devm_request_mem_region(&pdev->dev, iomem->start, |
86 | resource_size(iomem), "spear-sdhci")) { | |
c63b3cba VK |
87 | ret = -EBUSY; |
88 | dev_dbg(&pdev->dev, "cannot request region\n"); | |
89 | goto err; | |
90 | } | |
91 | ||
6ebaf8f2 | 92 | sdhci = devm_kzalloc(&pdev->dev, sizeof(*sdhci), GFP_KERNEL); |
c63b3cba VK |
93 | if (!sdhci) { |
94 | ret = -ENOMEM; | |
95 | dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n"); | |
6ebaf8f2 | 96 | goto err; |
c63b3cba VK |
97 | } |
98 | ||
99 | /* clk enable */ | |
100 | sdhci->clk = clk_get(&pdev->dev, NULL); | |
101 | if (IS_ERR(sdhci->clk)) { | |
102 | ret = PTR_ERR(sdhci->clk); | |
103 | dev_dbg(&pdev->dev, "Error getting clock\n"); | |
6ebaf8f2 | 104 | goto err; |
c63b3cba VK |
105 | } |
106 | ||
107 | ret = clk_enable(sdhci->clk); | |
108 | if (ret) { | |
109 | dev_dbg(&pdev->dev, "Error enabling clock\n"); | |
6ebaf8f2 | 110 | goto put_clk; |
c63b3cba VK |
111 | } |
112 | ||
113 | /* overwrite platform_data */ | |
114 | sdhci->data = dev_get_platdata(&pdev->dev); | |
115 | pdev->dev.platform_data = sdhci; | |
116 | ||
117 | if (pdev->dev.parent) | |
118 | host = sdhci_alloc_host(pdev->dev.parent, 0); | |
119 | else | |
120 | host = sdhci_alloc_host(&pdev->dev, 0); | |
121 | ||
122 | if (IS_ERR(host)) { | |
123 | ret = PTR_ERR(host); | |
124 | dev_dbg(&pdev->dev, "error allocating host\n"); | |
6ebaf8f2 | 125 | goto disable_clk; |
c63b3cba VK |
126 | } |
127 | ||
128 | host->hw_name = "sdhci"; | |
129 | host->ops = &sdhci_pltfm_ops; | |
130 | host->irq = platform_get_irq(pdev, 0); | |
131 | host->quirks = SDHCI_QUIRK_BROKEN_ADMA; | |
132 | ||
6ebaf8f2 VK |
133 | host->ioaddr = devm_ioremap(&pdev->dev, iomem->start, |
134 | resource_size(iomem)); | |
c63b3cba VK |
135 | if (!host->ioaddr) { |
136 | ret = -ENOMEM; | |
137 | dev_dbg(&pdev->dev, "failed to remap registers\n"); | |
6ebaf8f2 | 138 | goto free_host; |
c63b3cba VK |
139 | } |
140 | ||
141 | ret = sdhci_add_host(host); | |
142 | if (ret) { | |
143 | dev_dbg(&pdev->dev, "error adding host\n"); | |
6ebaf8f2 | 144 | goto free_host; |
c63b3cba VK |
145 | } |
146 | ||
147 | platform_set_drvdata(pdev, host); | |
148 | ||
149 | /* | |
150 | * It is optional to use GPIOs for sdhci Power control & sdhci card | |
151 | * interrupt detection. If sdhci->data is NULL, then use original sdhci | |
152 | * lines otherwise GPIO lines. | |
153 | * If GPIO is selected for power control, then power should be disabled | |
154 | * after card removal and should be enabled when card insertion | |
155 | * interrupt occurs | |
156 | */ | |
157 | if (!sdhci->data) | |
158 | return 0; | |
159 | ||
160 | if (sdhci->data->card_power_gpio >= 0) { | |
161 | int val = 0; | |
162 | ||
6ebaf8f2 VK |
163 | ret = devm_gpio_request(&pdev->dev, |
164 | sdhci->data->card_power_gpio, "sdhci"); | |
c63b3cba VK |
165 | if (ret < 0) { |
166 | dev_dbg(&pdev->dev, "gpio request fail: %d\n", | |
167 | sdhci->data->card_power_gpio); | |
6ebaf8f2 | 168 | goto set_drvdata; |
c63b3cba VK |
169 | } |
170 | ||
171 | if (sdhci->data->power_always_enb) | |
172 | val = sdhci->data->power_active_high; | |
173 | else | |
174 | val = !sdhci->data->power_active_high; | |
175 | ||
176 | ret = gpio_direction_output(sdhci->data->card_power_gpio, val); | |
177 | if (ret) { | |
178 | dev_dbg(&pdev->dev, "gpio set direction fail: %d\n", | |
179 | sdhci->data->card_power_gpio); | |
6ebaf8f2 | 180 | goto set_drvdata; |
c63b3cba | 181 | } |
c63b3cba VK |
182 | } |
183 | ||
184 | if (sdhci->data->card_int_gpio >= 0) { | |
6ebaf8f2 VK |
185 | ret = devm_gpio_request(&pdev->dev, sdhci->data->card_int_gpio, |
186 | "sdhci"); | |
c63b3cba VK |
187 | if (ret < 0) { |
188 | dev_dbg(&pdev->dev, "gpio request fail: %d\n", | |
189 | sdhci->data->card_int_gpio); | |
6ebaf8f2 | 190 | goto set_drvdata; |
c63b3cba VK |
191 | } |
192 | ||
193 | ret = gpio_direction_input(sdhci->data->card_int_gpio); | |
194 | if (ret) { | |
195 | dev_dbg(&pdev->dev, "gpio set direction fail: %d\n", | |
196 | sdhci->data->card_int_gpio); | |
6ebaf8f2 | 197 | goto set_drvdata; |
c63b3cba | 198 | } |
6ebaf8f2 VK |
199 | ret = devm_request_irq(&pdev->dev, |
200 | gpio_to_irq(sdhci->data->card_int_gpio), | |
c63b3cba VK |
201 | sdhci_gpio_irq, IRQF_TRIGGER_LOW, |
202 | mmc_hostname(host->mmc), pdev); | |
203 | if (ret) { | |
204 | dev_dbg(&pdev->dev, "gpio request irq fail: %d\n", | |
205 | sdhci->data->card_int_gpio); | |
6ebaf8f2 | 206 | goto set_drvdata; |
c63b3cba VK |
207 | } |
208 | ||
209 | } | |
210 | ||
211 | return 0; | |
212 | ||
6ebaf8f2 | 213 | set_drvdata: |
c63b3cba VK |
214 | platform_set_drvdata(pdev, NULL); |
215 | sdhci_remove_host(host, 1); | |
6ebaf8f2 | 216 | free_host: |
c63b3cba | 217 | sdhci_free_host(host); |
6ebaf8f2 | 218 | disable_clk: |
c63b3cba | 219 | clk_disable(sdhci->clk); |
6ebaf8f2 | 220 | put_clk: |
c63b3cba | 221 | clk_put(sdhci->clk); |
c63b3cba VK |
222 | err: |
223 | dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret); | |
224 | return ret; | |
225 | } | |
226 | ||
227 | static int __devexit sdhci_remove(struct platform_device *pdev) | |
228 | { | |
229 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
c63b3cba | 230 | struct spear_sdhci *sdhci = dev_get_platdata(&pdev->dev); |
6ebaf8f2 | 231 | int dead = 0; |
c63b3cba VK |
232 | u32 scratch; |
233 | ||
c63b3cba | 234 | platform_set_drvdata(pdev, NULL); |
c63b3cba VK |
235 | scratch = readl(host->ioaddr + SDHCI_INT_STATUS); |
236 | if (scratch == (u32)-1) | |
237 | dead = 1; | |
238 | ||
239 | sdhci_remove_host(host, dead); | |
c63b3cba VK |
240 | sdhci_free_host(host); |
241 | clk_disable(sdhci->clk); | |
242 | clk_put(sdhci->clk); | |
c63b3cba VK |
243 | |
244 | return 0; | |
245 | } | |
246 | ||
b70a7fab VK |
247 | #ifdef CONFIG_PM |
248 | static int sdhci_suspend(struct device *dev) | |
249 | { | |
250 | struct sdhci_host *host = dev_get_drvdata(dev); | |
251 | struct spear_sdhci *sdhci = dev_get_platdata(dev); | |
b70a7fab VK |
252 | int ret; |
253 | ||
984589e5 | 254 | ret = sdhci_suspend_host(host); |
b70a7fab VK |
255 | if (!ret) |
256 | clk_disable(sdhci->clk); | |
257 | ||
258 | return ret; | |
259 | } | |
260 | ||
261 | static int sdhci_resume(struct device *dev) | |
262 | { | |
263 | struct sdhci_host *host = dev_get_drvdata(dev); | |
264 | struct spear_sdhci *sdhci = dev_get_platdata(dev); | |
265 | int ret; | |
266 | ||
267 | ret = clk_enable(sdhci->clk); | |
268 | if (ret) { | |
269 | dev_dbg(dev, "Resume: Error enabling clock\n"); | |
270 | return ret; | |
271 | } | |
272 | ||
273 | return sdhci_resume_host(host); | |
274 | } | |
b70a7fab VK |
275 | #endif |
276 | ||
4b1a6170 SH |
277 | static SIMPLE_DEV_PM_OPS(sdhci_pm_ops, sdhci_suspend, sdhci_resume); |
278 | ||
c63b3cba VK |
279 | static struct platform_driver sdhci_driver = { |
280 | .driver = { | |
281 | .name = "sdhci", | |
282 | .owner = THIS_MODULE, | |
b70a7fab | 283 | .pm = &sdhci_pm_ops, |
c63b3cba VK |
284 | }, |
285 | .probe = sdhci_probe, | |
286 | .remove = __devexit_p(sdhci_remove), | |
287 | }; | |
288 | ||
d1f81a64 | 289 | module_platform_driver(sdhci_driver); |
c63b3cba VK |
290 | |
291 | MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver"); | |
10d8935f | 292 | MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>"); |
c63b3cba | 293 | MODULE_LICENSE("GPL v2"); |