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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / mmc / host / sdhci-pxav3.c
blob793dacd3b8413c5cd4eae8fc39c420c4f3ffdb5c
1 /*
2 * Copyright (C) 2010 Marvell International Ltd.
3 * Zhangfei Gao <zhangfei.gao@marvell.com>
4 * Kevin Wang <dwang4@marvell.com>
5 * Mingwei Wang <mwwang@marvell.com>
6 * Philip Rakity <prakity@marvell.com>
7 * Mark Brown <markb@marvell.com>
8 *
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 */
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/clk.h>
23 #include <linux/io.h>
24 #include <linux/gpio.h>
25 #include <linux/mmc/card.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/slot-gpio.h>
28 #include <linux/platform_data/pxa_sdhci.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/module.h>
32 #include <linux/of.h>
33 #include <linux/of_device.h>
34 #include <linux/of_gpio.h>
35 #include <linux/pm.h>
36 #include <linux/pm_runtime.h>
37
38 #include "sdhci.h"
39 #include "sdhci-pltfm.h"
40
41 #define PXAV3_RPM_DELAY_MS 50
42
43 #define SD_CLOCK_BURST_SIZE_SETUP 0x10A
44 #define SDCLK_SEL 0x100
45 #define SDCLK_DELAY_SHIFT 9
46 #define SDCLK_DELAY_MASK 0x1f
47
48 #define SD_CFG_FIFO_PARAM 0x100
49 #define SDCFG_GEN_PAD_CLK_ON (1<<6)
50 #define SDCFG_GEN_PAD_CLK_CNT_MASK 0xFF
51 #define SDCFG_GEN_PAD_CLK_CNT_SHIFT 24
52
53 #define SD_SPI_MODE 0x108
54 #define SD_CE_ATA_1 0x10C
55
56 #define SD_CE_ATA_2 0x10E
57 #define SDCE_MISC_INT (1<<2)
58 #define SDCE_MISC_INT_EN (1<<1)
59
60 static void pxav3_set_private_registers(struct sdhci_host *host, u8 mask)
61 {
62 struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
63 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
64
65 if (mask == SDHCI_RESET_ALL) {
66 /*
67 * tune timing of read data/command when crc error happen
68 * no performance impact
69 */
70 if (pdata && 0 != pdata->clk_delay_cycles) {
71 u16 tmp;
72
73 tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
74 tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
75 << SDCLK_DELAY_SHIFT;
76 tmp |= SDCLK_SEL;
77 writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
78 }
79 }
80 }
81
82 #define MAX_WAIT_COUNT 5
83 static void pxav3_gen_init_74_clocks(struct sdhci_host *host, u8 power_mode)
84 {
85 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
86 struct sdhci_pxa *pxa = pltfm_host->priv;
87 u16 tmp;
88 int count;
89
90 if (pxa->power_mode == MMC_POWER_UP
91 && power_mode == MMC_POWER_ON) {
92
93 dev_dbg(mmc_dev(host->mmc),
94 "%s: slot->power_mode = %d,"
95 "ios->power_mode = %d\n",
96 __func__,
97 pxa->power_mode,
98 power_mode);
99
100 /* set we want notice of when 74 clocks are sent */
101 tmp = readw(host->ioaddr + SD_CE_ATA_2);
102 tmp |= SDCE_MISC_INT_EN;
103 writew(tmp, host->ioaddr + SD_CE_ATA_2);
104
105 /* start sending the 74 clocks */
106 tmp = readw(host->ioaddr + SD_CFG_FIFO_PARAM);
107 tmp |= SDCFG_GEN_PAD_CLK_ON;
108 writew(tmp, host->ioaddr + SD_CFG_FIFO_PARAM);
109
110 /* slowest speed is about 100KHz or 10usec per clock */
111 udelay(740);
112 count = 0;
113
114 while (count++ < MAX_WAIT_COUNT) {
115 if ((readw(host->ioaddr + SD_CE_ATA_2)
116 & SDCE_MISC_INT) == 0)
117 break;
118 udelay(10);
119 }
120
121 if (count == MAX_WAIT_COUNT)
122 dev_warn(mmc_dev(host->mmc), "74 clock interrupt not cleared\n");
123
124 /* clear the interrupt bit if posted */
125 tmp = readw(host->ioaddr + SD_CE_ATA_2);
126 tmp |= SDCE_MISC_INT;
127 writew(tmp, host->ioaddr + SD_CE_ATA_2);
128 }
129 pxa->power_mode = power_mode;
130 }
131
132 static int pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
133 {
134 u16 ctrl_2;
135
136 /*
137 * Set V18_EN -- UHS modes do not work without this.
138 * does not change signaling voltage
139 */
140 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
141
142 /* Select Bus Speed Mode for host */
143 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
144 switch (uhs) {
145 case MMC_TIMING_UHS_SDR12:
146 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
147 break;
148 case MMC_TIMING_UHS_SDR25:
149 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
150 break;
151 case MMC_TIMING_UHS_SDR50:
152 ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180;
153 break;
154 case MMC_TIMING_UHS_SDR104:
155 ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180;
156 break;
157 case MMC_TIMING_UHS_DDR50:
158 ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180;
159 break;
160 }
161
162 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
163 dev_dbg(mmc_dev(host->mmc),
164 "%s uhs = %d, ctrl_2 = %04X\n",
165 __func__, uhs, ctrl_2);
166
167 return 0;
168 }
169
170 static const struct sdhci_ops pxav3_sdhci_ops = {
171 .platform_reset_exit = pxav3_set_private_registers,
172 .set_uhs_signaling = pxav3_set_uhs_signaling,
173 .platform_send_init_74_clocks = pxav3_gen_init_74_clocks,
174 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
175 };
176
177 static struct sdhci_pltfm_data sdhci_pxav3_pdata = {
178 .quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK
179 | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
180 | SDHCI_QUIRK_32BIT_ADMA_SIZE
181 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
182 .ops = &pxav3_sdhci_ops,
183 };
184
185 #ifdef CONFIG_OF
186 static const struct of_device_id sdhci_pxav3_of_match[] = {
187 {
188 .compatible = "mrvl,pxav3-mmc",
189 },
190 {},
191 };
192 MODULE_DEVICE_TABLE(of, sdhci_pxav3_of_match);
193
194 static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)
195 {
196 struct sdhci_pxa_platdata *pdata;
197 struct device_node *np = dev->of_node;
198 u32 clk_delay_cycles;
199
200 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
201 if (!pdata)
202 return NULL;
203
204 of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
205 if (clk_delay_cycles > 0)
206 pdata->clk_delay_cycles = clk_delay_cycles;
207
208 return pdata;
209 }
210 #else
211 static inline struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)
212 {
213 return NULL;
214 }
215 #endif
216
217 static int sdhci_pxav3_probe(struct platform_device *pdev)
218 {
219 struct sdhci_pltfm_host *pltfm_host;
220 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
221 struct device *dev = &pdev->dev;
222 struct sdhci_host *host = NULL;
223 struct sdhci_pxa *pxa = NULL;
224 const struct of_device_id *match;
225
226 int ret;
227 struct clk *clk;
228
229 pxa = kzalloc(sizeof(struct sdhci_pxa), GFP_KERNEL);
230 if (!pxa)
231 return -ENOMEM;
232
233 host = sdhci_pltfm_init(pdev, &sdhci_pxav3_pdata, 0);
234 if (IS_ERR(host)) {
235 kfree(pxa);
236 return PTR_ERR(host);
237 }
238 pltfm_host = sdhci_priv(host);
239 pltfm_host->priv = pxa;
240
241 clk = clk_get(dev, NULL);
242 if (IS_ERR(clk)) {
243 dev_err(dev, "failed to get io clock\n");
244 ret = PTR_ERR(clk);
245 goto err_clk_get;
246 }
247 pltfm_host->clk = clk;
248 clk_prepare_enable(clk);
249
250 /* enable 1/8V DDR capable */
251 host->mmc->caps |= MMC_CAP_1_8V_DDR;
252
253 match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev);
254 if (match) {
255 ret = mmc_of_parse(host->mmc);
256 if (ret)
257 goto err_of_parse;
258 sdhci_get_of_property(pdev);
259 pdata = pxav3_get_mmc_pdata(dev);
260 } else if (pdata) {
261 /* on-chip device */
262 if (pdata->flags & PXA_FLAG_CARD_PERMANENT)
263 host->mmc->caps |= MMC_CAP_NONREMOVABLE;
264
265 /* If slot design supports 8 bit data, indicate this to MMC. */
266 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
267 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
268
269 if (pdata->quirks)
270 host->quirks |= pdata->quirks;
271 if (pdata->quirks2)
272 host->quirks2 |= pdata->quirks2;
273 if (pdata->host_caps)
274 host->mmc->caps |= pdata->host_caps;
275 if (pdata->host_caps2)
276 host->mmc->caps2 |= pdata->host_caps2;
277 if (pdata->pm_caps)
278 host->mmc->pm_caps |= pdata->pm_caps;
279
280 if (gpio_is_valid(pdata->ext_cd_gpio)) {
281 ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio,
282 0);
283 if (ret) {
284 dev_err(mmc_dev(host->mmc),
285 "failed to allocate card detect gpio\n");
286 goto err_cd_req;
287 }
288 }
289 }
290
291 pm_runtime_enable(&pdev->dev);
292 pm_runtime_get_sync(&pdev->dev);
293 pm_runtime_set_autosuspend_delay(&pdev->dev, PXAV3_RPM_DELAY_MS);
294 pm_runtime_use_autosuspend(&pdev->dev);
295 pm_suspend_ignore_children(&pdev->dev, 1);
296
297 ret = sdhci_add_host(host);
298 if (ret) {
299 dev_err(&pdev->dev, "failed to add host\n");
300 goto err_add_host;
301 }
302
303 platform_set_drvdata(pdev, host);
304
305 if (host->mmc->pm_caps & MMC_PM_KEEP_POWER) {
306 device_init_wakeup(&pdev->dev, 1);
307 host->mmc->pm_flags |= MMC_PM_WAKE_SDIO_IRQ;
308 } else {
309 device_init_wakeup(&pdev->dev, 0);
310 }
311
312 pm_runtime_put_autosuspend(&pdev->dev);
313
314 return 0;
315
316 err_of_parse:
317 err_cd_req:
318 err_add_host:
319 pm_runtime_put_sync(&pdev->dev);
320 pm_runtime_disable(&pdev->dev);
321 clk_disable_unprepare(clk);
322 clk_put(clk);
323 err_clk_get:
324 sdhci_pltfm_free(pdev);
325 kfree(pxa);
326 return ret;
327 }
328
329 static int sdhci_pxav3_remove(struct platform_device *pdev)
330 {
331 struct sdhci_host *host = platform_get_drvdata(pdev);
332 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
333 struct sdhci_pxa *pxa = pltfm_host->priv;
334
335 pm_runtime_get_sync(&pdev->dev);
336 sdhci_remove_host(host, 1);
337 pm_runtime_disable(&pdev->dev);
338
339 clk_disable_unprepare(pltfm_host->clk);
340 clk_put(pltfm_host->clk);
341
342 sdhci_pltfm_free(pdev);
343 kfree(pxa);
344
345 return 0;
346 }
347
348 #ifdef CONFIG_PM_SLEEP
349 static int sdhci_pxav3_suspend(struct device *dev)
350 {
351 int ret;
352 struct sdhci_host *host = dev_get_drvdata(dev);
353
354 pm_runtime_get_sync(dev);
355 ret = sdhci_suspend_host(host);
356 pm_runtime_mark_last_busy(dev);
357 pm_runtime_put_autosuspend(dev);
358
359 return ret;
360 }
361
362 static int sdhci_pxav3_resume(struct device *dev)
363 {
364 int ret;
365 struct sdhci_host *host = dev_get_drvdata(dev);
366
367 pm_runtime_get_sync(dev);
368 ret = sdhci_resume_host(host);
369 pm_runtime_mark_last_busy(dev);
370 pm_runtime_put_autosuspend(dev);
371
372 return ret;
373 }
374 #endif
375
376 #ifdef CONFIG_PM_RUNTIME
377 static int sdhci_pxav3_runtime_suspend(struct device *dev)
378 {
379 struct sdhci_host *host = dev_get_drvdata(dev);
380 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
381 unsigned long flags;
382
383 if (pltfm_host->clk) {
384 spin_lock_irqsave(&host->lock, flags);
385 host->runtime_suspended = true;
386 spin_unlock_irqrestore(&host->lock, flags);
387
388 clk_disable_unprepare(pltfm_host->clk);
389 }
390
391 return 0;
392 }
393
394 static int sdhci_pxav3_runtime_resume(struct device *dev)
395 {
396 struct sdhci_host *host = dev_get_drvdata(dev);
397 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
398 unsigned long flags;
399
400 if (pltfm_host->clk) {
401 clk_prepare_enable(pltfm_host->clk);
402
403 spin_lock_irqsave(&host->lock, flags);
404 host->runtime_suspended = false;
405 spin_unlock_irqrestore(&host->lock, flags);
406 }
407
408 return 0;
409 }
410 #endif
411
412 #ifdef CONFIG_PM
413 static const struct dev_pm_ops sdhci_pxav3_pmops = {
414 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pxav3_suspend, sdhci_pxav3_resume)
415 SET_RUNTIME_PM_OPS(sdhci_pxav3_runtime_suspend,
416 sdhci_pxav3_runtime_resume, NULL)
417 };
418
419 #define SDHCI_PXAV3_PMOPS (&sdhci_pxav3_pmops)
420
421 #else
422 #define SDHCI_PXAV3_PMOPS NULL
423 #endif
424
425 static struct platform_driver sdhci_pxav3_driver = {
426 .driver = {
427 .name = "sdhci-pxav3",
428 #ifdef CONFIG_OF
429 .of_match_table = sdhci_pxav3_of_match,
430 #endif
431 .owner = THIS_MODULE,
432 .pm = SDHCI_PXAV3_PMOPS,
433 },
434 .probe = sdhci_pxav3_probe,
435 .remove = sdhci_pxav3_remove,
436 };
437
438 module_platform_driver(sdhci_pxav3_driver);
439
440 MODULE_DESCRIPTION("SDHCI driver for pxav3");
441 MODULE_AUTHOR("Marvell International Ltd.");
442 MODULE_LICENSE("GPL v2");
443
Linux with added FPC-III support