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Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / mmc / host / sdhci-tegra.c
blob67176afcf2db3ac9d6889b593458ea9c4b459a3f
1 /*
2 * Copyright (C) 2010 Google, Inc.
3 *
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 */
14
15 #include <linux/err.h>
16 #include <linux/init.h>
17 #include <linux/platform_device.h>
18 #include <linux/clk.h>
19 #include <linux/io.h>
20 #include <linux/of.h>
21 #include <linux/of_gpio.h>
22 #include <linux/gpio.h>
23 #include <linux/mmc/card.h>
24 #include <linux/mmc/host.h>
25 #include <linux/module.h>
26
27 #include <asm/gpio.h>
28 #include <mach/sdhci.h>
29
30 #include "sdhci-pltfm.h"
31
32 static u32 tegra_sdhci_readl(struct sdhci_host *host, int reg)
33 {
34 u32 val;
35
36 if (unlikely(reg == SDHCI_PRESENT_STATE)) {
37 /* Use wp_gpio here instead? */
38 val = readl(host->ioaddr + reg);
39 return val | SDHCI_WRITE_PROTECT;
40 }
41
42 return readl(host->ioaddr + reg);
43 }
44
45 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
46 {
47 if (unlikely(reg == SDHCI_HOST_VERSION)) {
48 /* Erratum: Version register is invalid in HW. */
49 return SDHCI_SPEC_200;
50 }
51
52 return readw(host->ioaddr + reg);
53 }
54
55 static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
56 {
57 /* Seems like we're getting spurious timeout and crc errors, so
58 * disable signalling of them. In case of real errors software
59 * timers should take care of eventually detecting them.
60 */
61 if (unlikely(reg == SDHCI_SIGNAL_ENABLE))
62 val &= ~(SDHCI_INT_TIMEOUT|SDHCI_INT_CRC);
63
64 writel(val, host->ioaddr + reg);
65
66 if (unlikely(reg == SDHCI_INT_ENABLE)) {
67 /* Erratum: Must enable block gap interrupt detection */
68 u8 gap_ctrl = readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
69 if (val & SDHCI_INT_CARD_INT)
70 gap_ctrl |= 0x8;
71 else
72 gap_ctrl &= ~0x8;
73 writeb(gap_ctrl, host->ioaddr + SDHCI_BLOCK_GAP_CONTROL);
74 }
75 }
76
77 static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
78 {
79 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
80 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
81
82 if (!gpio_is_valid(plat->wp_gpio))
83 return -1;
84
85 return gpio_get_value(plat->wp_gpio);
86 }
87
88 static irqreturn_t carddetect_irq(int irq, void *data)
89 {
90 struct sdhci_host *sdhost = (struct sdhci_host *)data;
91
92 tasklet_schedule(&sdhost->card_tasklet);
93 return IRQ_HANDLED;
94 };
95
96 static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
97 {
98 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
99 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
100 u32 ctrl;
101
102 ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
103 if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
104 ctrl &= ~SDHCI_CTRL_4BITBUS;
105 ctrl |= SDHCI_CTRL_8BITBUS;
106 } else {
107 ctrl &= ~SDHCI_CTRL_8BITBUS;
108 if (bus_width == MMC_BUS_WIDTH_4)
109 ctrl |= SDHCI_CTRL_4BITBUS;
110 else
111 ctrl &= ~SDHCI_CTRL_4BITBUS;
112 }
113 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
114 return 0;
115 }
116
117 static struct sdhci_ops tegra_sdhci_ops = {
118 .get_ro = tegra_sdhci_get_ro,
119 .read_l = tegra_sdhci_readl,
120 .read_w = tegra_sdhci_readw,
121 .write_l = tegra_sdhci_writel,
122 .platform_8bit_width = tegra_sdhci_8bit,
123 };
124
125 static struct sdhci_pltfm_data sdhci_tegra_pdata = {
126 .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
127 SDHCI_QUIRK_SINGLE_POWER_WRITE |
128 SDHCI_QUIRK_NO_HISPD_BIT |
129 SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
130 .ops = &tegra_sdhci_ops,
131 };
132
133 static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
134 { .compatible = "nvidia,tegra20-sdhci", },
135 {}
136 };
137 MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
138
139 static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
140 struct platform_device *pdev)
141 {
142 struct tegra_sdhci_platform_data *plat;
143 struct device_node *np = pdev->dev.of_node;
144
145 if (!np)
146 return NULL;
147
148 plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
149 if (!plat) {
150 dev_err(&pdev->dev, "Can't allocate platform data\n");
151 return NULL;
152 }
153
154 plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
155 plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
156 plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
157 if (of_find_property(np, "support-8bit", NULL))
158 plat->is_8bit = 1;
159
160 return plat;
161 }
162
163 static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
164 {
165 struct sdhci_pltfm_host *pltfm_host;
166 struct tegra_sdhci_platform_data *plat;
167 struct sdhci_host *host;
168 struct clk *clk;
169 int rc;
170
171 host = sdhci_pltfm_init(pdev, &sdhci_tegra_pdata);
172 if (IS_ERR(host))
173 return PTR_ERR(host);
174
175 pltfm_host = sdhci_priv(host);
176
177 plat = pdev->dev.platform_data;
178
179 if (plat == NULL)
180 plat = sdhci_tegra_dt_parse_pdata(pdev);
181
182 if (plat == NULL) {
183 dev_err(mmc_dev(host->mmc), "missing platform data\n");
184 rc = -ENXIO;
185 goto err_no_plat;
186 }
187
188 pltfm_host->priv = plat;
189
190 if (gpio_is_valid(plat->power_gpio)) {
191 rc = gpio_request(plat->power_gpio, "sdhci_power");
192 if (rc) {
193 dev_err(mmc_dev(host->mmc),
194 "failed to allocate power gpio\n");
195 goto err_power_req;
196 }
197 tegra_gpio_enable(plat->power_gpio);
198 gpio_direction_output(plat->power_gpio, 1);
199 }
200
201 if (gpio_is_valid(plat->cd_gpio)) {
202 rc = gpio_request(plat->cd_gpio, "sdhci_cd");
203 if (rc) {
204 dev_err(mmc_dev(host->mmc),
205 "failed to allocate cd gpio\n");
206 goto err_cd_req;
207 }
208 tegra_gpio_enable(plat->cd_gpio);
209 gpio_direction_input(plat->cd_gpio);
210
211 rc = request_irq(gpio_to_irq(plat->cd_gpio), carddetect_irq,
212 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
213 mmc_hostname(host->mmc), host);
214
215 if (rc) {
216 dev_err(mmc_dev(host->mmc), "request irq error\n");
217 goto err_cd_irq_req;
218 }
219
220 }
221
222 if (gpio_is_valid(plat->wp_gpio)) {
223 rc = gpio_request(plat->wp_gpio, "sdhci_wp");
224 if (rc) {
225 dev_err(mmc_dev(host->mmc),
226 "failed to allocate wp gpio\n");
227 goto err_wp_req;
228 }
229 tegra_gpio_enable(plat->wp_gpio);
230 gpio_direction_input(plat->wp_gpio);
231 }
232
233 clk = clk_get(mmc_dev(host->mmc), NULL);
234 if (IS_ERR(clk)) {
235 dev_err(mmc_dev(host->mmc), "clk err\n");
236 rc = PTR_ERR(clk);
237 goto err_clk_get;
238 }
239 clk_enable(clk);
240 pltfm_host->clk = clk;
241
242 host->mmc->pm_caps = plat->pm_flags;
243
244 if (plat->is_8bit)
245 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
246
247 rc = sdhci_add_host(host);
248 if (rc)
249 goto err_add_host;
250
251 return 0;
252
253 err_add_host:
254 clk_disable(pltfm_host->clk);
255 clk_put(pltfm_host->clk);
256 err_clk_get:
257 if (gpio_is_valid(plat->wp_gpio)) {
258 tegra_gpio_disable(plat->wp_gpio);
259 gpio_free(plat->wp_gpio);
260 }
261 err_wp_req:
262 if (gpio_is_valid(plat->cd_gpio))
263 free_irq(gpio_to_irq(plat->cd_gpio), host);
264 err_cd_irq_req:
265 if (gpio_is_valid(plat->cd_gpio)) {
266 tegra_gpio_disable(plat->cd_gpio);
267 gpio_free(plat->cd_gpio);
268 }
269 err_cd_req:
270 if (gpio_is_valid(plat->power_gpio)) {
271 tegra_gpio_disable(plat->power_gpio);
272 gpio_free(plat->power_gpio);
273 }
274 err_power_req:
275 err_no_plat:
276 sdhci_pltfm_free(pdev);
277 return rc;
278 }
279
280 static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
281 {
282 struct sdhci_host *host = platform_get_drvdata(pdev);
283 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
284 struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
285 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
286
287 sdhci_remove_host(host, dead);
288
289 if (gpio_is_valid(plat->wp_gpio)) {
290 tegra_gpio_disable(plat->wp_gpio);
291 gpio_free(plat->wp_gpio);
292 }
293
294 if (gpio_is_valid(plat->cd_gpio)) {
295 free_irq(gpio_to_irq(plat->cd_gpio), host);
296 tegra_gpio_disable(plat->cd_gpio);
297 gpio_free(plat->cd_gpio);
298 }
299
300 if (gpio_is_valid(plat->power_gpio)) {
301 tegra_gpio_disable(plat->power_gpio);
302 gpio_free(plat->power_gpio);
303 }
304
305 clk_disable(pltfm_host->clk);
306 clk_put(pltfm_host->clk);
307
308 sdhci_pltfm_free(pdev);
309
310 return 0;
311 }
312
313 static struct platform_driver sdhci_tegra_driver = {
314 .driver = {
315 .name = "sdhci-tegra",
316 .owner = THIS_MODULE,
317 .of_match_table = sdhci_tegra_dt_match,
318 },
319 .probe = sdhci_tegra_probe,
320 .remove = __devexit_p(sdhci_tegra_remove),
321 #ifdef CONFIG_PM
322 .suspend = sdhci_pltfm_suspend,
323 .resume = sdhci_pltfm_resume,
324 #endif
325 };
326
327 static int __init sdhci_tegra_init(void)
328 {
329 return platform_driver_register(&sdhci_tegra_driver);
330 }
331 module_init(sdhci_tegra_init);
332
333 static void __exit sdhci_tegra_exit(void)
334 {
335 platform_driver_unregister(&sdhci_tegra_driver);
336 }
337 module_exit(sdhci_tegra_exit);
338
339 MODULE_DESCRIPTION("SDHCI driver for Tegra");
340 MODULE_AUTHOR(" Google, Inc.");
341 MODULE_LICENSE("GPL v2");
linux-next