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Merge tag 'iio-fixes-for-4.4a' of ssh://ra.kernel.org/pub/scm/linux/kernel/git/jic23...
[deliverable/linux.git] / drivers / mmc / host / sdhci-pxav3.c
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 #include <linux/mbus.h>
38
39 #include "sdhci.h"
40 #include "sdhci-pltfm.h"
41
42 #define PXAV3_RPM_DELAY_MS 50
43
44 #define SD_CLOCK_BURST_SIZE_SETUP 0x10A
45 #define SDCLK_SEL 0x100
46 #define SDCLK_DELAY_SHIFT 9
47 #define SDCLK_DELAY_MASK 0x1f
48
49 #define SD_CFG_FIFO_PARAM 0x100
50 #define SDCFG_GEN_PAD_CLK_ON (1<<6)
51 #define SDCFG_GEN_PAD_CLK_CNT_MASK 0xFF
52 #define SDCFG_GEN_PAD_CLK_CNT_SHIFT 24
53
54 #define SD_SPI_MODE 0x108
55 #define SD_CE_ATA_1 0x10C
56
57 #define SD_CE_ATA_2 0x10E
58 #define SDCE_MISC_INT (1<<2)
59 #define SDCE_MISC_INT_EN (1<<1)
60
61 struct sdhci_pxa {
62 struct clk *clk_core;
63 struct clk *clk_io;
64 u8 power_mode;
65 void __iomem *sdio3_conf_reg;
66 };
67
68 /*
69 * These registers are relative to the second register region, for the
70 * MBus bridge.
71 */
72 #define SDHCI_WINDOW_CTRL(i) (0x80 + ((i) << 3))
73 #define SDHCI_WINDOW_BASE(i) (0x84 + ((i) << 3))
74 #define SDHCI_MAX_WIN_NUM 8
75
76 /*
77 * Fields below belong to SDIO3 Configuration Register (third register
78 * region for the Armada 38x flavor)
79 */
80
81 #define SDIO3_CONF_CLK_INV BIT(0)
82 #define SDIO3_CONF_SD_FB_CLK BIT(2)
83
84 static int mv_conf_mbus_windows(struct platform_device *pdev,
85 const struct mbus_dram_target_info *dram)
86 {
87 int i;
88 void __iomem *regs;
89 struct resource *res;
90
91 if (!dram) {
92 dev_err(&pdev->dev, "no mbus dram info\n");
93 return -EINVAL;
94 }
95
96 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
97 if (!res) {
98 dev_err(&pdev->dev, "cannot get mbus registers\n");
99 return -EINVAL;
100 }
101
102 regs = ioremap(res->start, resource_size(res));
103 if (!regs) {
104 dev_err(&pdev->dev, "cannot map mbus registers\n");
105 return -ENOMEM;
106 }
107
108 for (i = 0; i < SDHCI_MAX_WIN_NUM; i++) {
109 writel(0, regs + SDHCI_WINDOW_CTRL(i));
110 writel(0, regs + SDHCI_WINDOW_BASE(i));
111 }
112
113 for (i = 0; i < dram->num_cs; i++) {
114 const struct mbus_dram_window *cs = dram->cs + i;
115
116 /* Write size, attributes and target id to control register */
117 writel(((cs->size - 1) & 0xffff0000) |
118 (cs->mbus_attr << 8) |
119 (dram->mbus_dram_target_id << 4) | 1,
120 regs + SDHCI_WINDOW_CTRL(i));
121 /* Write base address to base register */
122 writel(cs->base, regs + SDHCI_WINDOW_BASE(i));
123 }
124
125 iounmap(regs);
126
127 return 0;
128 }
129
130 static int armada_38x_quirks(struct platform_device *pdev,
131 struct sdhci_host *host)
132 {
133 struct device_node *np = pdev->dev.of_node;
134 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
135 struct sdhci_pxa *pxa = pltfm_host->priv;
136 struct resource *res;
137
138 host->quirks &= ~SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
139 host->quirks |= SDHCI_QUIRK_MISSING_CAPS;
140 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
141 "conf-sdio3");
142 if (res) {
143 pxa->sdio3_conf_reg = devm_ioremap_resource(&pdev->dev, res);
144 if (IS_ERR(pxa->sdio3_conf_reg))
145 return PTR_ERR(pxa->sdio3_conf_reg);
146 } else {
147 /*
148 * According to erratum 'FE-2946959' both SDR50 and DDR50
149 * modes require specific clock adjustments in SDIO3
150 * Configuration register, if the adjustment is not done,
151 * remove them from the capabilities.
152 */
153 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
154 host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50);
155
156 dev_warn(&pdev->dev, "conf-sdio3 register not found: disabling SDR50 and DDR50 modes.\nConsider updating your dtb\n");
157 }
158
159 /*
160 * According to erratum 'ERR-7878951' Armada 38x SDHCI
161 * controller has different capabilities than the ones shown
162 * in its registers
163 */
164 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
165 if (of_property_read_bool(np, "no-1-8-v")) {
166 host->caps &= ~SDHCI_CAN_VDD_180;
167 host->mmc->caps &= ~MMC_CAP_1_8V_DDR;
168 } else {
169 host->caps &= ~SDHCI_CAN_VDD_330;
170 }
171 host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_USE_SDR50_TUNING);
172
173 return 0;
174 }
175
176 static void pxav3_reset(struct sdhci_host *host, u8 mask)
177 {
178 struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
179 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
180
181 sdhci_reset(host, mask);
182
183 if (mask == SDHCI_RESET_ALL) {
184 /*
185 * tune timing of read data/command when crc error happen
186 * no performance impact
187 */
188 if (pdata && 0 != pdata->clk_delay_cycles) {
189 u16 tmp;
190
191 tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
192 tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
193 << SDCLK_DELAY_SHIFT;
194 tmp |= SDCLK_SEL;
195 writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
196 }
197 }
198 }
199
200 #define MAX_WAIT_COUNT 5
201 static void pxav3_gen_init_74_clocks(struct sdhci_host *host, u8 power_mode)
202 {
203 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
204 struct sdhci_pxa *pxa = pltfm_host->priv;
205 u16 tmp;
206 int count;
207
208 if (pxa->power_mode == MMC_POWER_UP
209 && power_mode == MMC_POWER_ON) {
210
211 dev_dbg(mmc_dev(host->mmc),
212 "%s: slot->power_mode = %d,"
213 "ios->power_mode = %d\n",
214 __func__,
215 pxa->power_mode,
216 power_mode);
217
218 /* set we want notice of when 74 clocks are sent */
219 tmp = readw(host->ioaddr + SD_CE_ATA_2);
220 tmp |= SDCE_MISC_INT_EN;
221 writew(tmp, host->ioaddr + SD_CE_ATA_2);
222
223 /* start sending the 74 clocks */
224 tmp = readw(host->ioaddr + SD_CFG_FIFO_PARAM);
225 tmp |= SDCFG_GEN_PAD_CLK_ON;
226 writew(tmp, host->ioaddr + SD_CFG_FIFO_PARAM);
227
228 /* slowest speed is about 100KHz or 10usec per clock */
229 udelay(740);
230 count = 0;
231
232 while (count++ < MAX_WAIT_COUNT) {
233 if ((readw(host->ioaddr + SD_CE_ATA_2)
234 & SDCE_MISC_INT) == 0)
235 break;
236 udelay(10);
237 }
238
239 if (count == MAX_WAIT_COUNT)
240 dev_warn(mmc_dev(host->mmc), "74 clock interrupt not cleared\n");
241
242 /* clear the interrupt bit if posted */
243 tmp = readw(host->ioaddr + SD_CE_ATA_2);
244 tmp |= SDCE_MISC_INT;
245 writew(tmp, host->ioaddr + SD_CE_ATA_2);
246 }
247 pxa->power_mode = power_mode;
248 }
249
250 static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
251 {
252 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
253 struct sdhci_pxa *pxa = pltfm_host->priv;
254 u16 ctrl_2;
255
256 /*
257 * Set V18_EN -- UHS modes do not work without this.
258 * does not change signaling voltage
259 */
260 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
261
262 /* Select Bus Speed Mode for host */
263 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
264 switch (uhs) {
265 case MMC_TIMING_UHS_SDR12:
266 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
267 break;
268 case MMC_TIMING_UHS_SDR25:
269 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
270 break;
271 case MMC_TIMING_UHS_SDR50:
272 ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180;
273 break;
274 case MMC_TIMING_UHS_SDR104:
275 ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180;
276 break;
277 case MMC_TIMING_MMC_DDR52:
278 case MMC_TIMING_UHS_DDR50:
279 ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180;
280 break;
281 }
282
283 /*
284 * Update SDIO3 Configuration register according to erratum
285 * FE-2946959
286 */
287 if (pxa->sdio3_conf_reg) {
288 u8 reg_val = readb(pxa->sdio3_conf_reg);
289
290 if (uhs == MMC_TIMING_UHS_SDR50 ||
291 uhs == MMC_TIMING_UHS_DDR50) {
292 reg_val &= ~SDIO3_CONF_CLK_INV;
293 reg_val |= SDIO3_CONF_SD_FB_CLK;
294 } else if (uhs == MMC_TIMING_MMC_HS) {
295 reg_val &= ~SDIO3_CONF_CLK_INV;
296 reg_val &= ~SDIO3_CONF_SD_FB_CLK;
297 } else {
298 reg_val |= SDIO3_CONF_CLK_INV;
299 reg_val &= ~SDIO3_CONF_SD_FB_CLK;
300 }
301 writeb(reg_val, pxa->sdio3_conf_reg);
302 }
303
304 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
305 dev_dbg(mmc_dev(host->mmc),
306 "%s uhs = %d, ctrl_2 = %04X\n",
307 __func__, uhs, ctrl_2);
308 }
309
310 static const struct sdhci_ops pxav3_sdhci_ops = {
311 .set_clock = sdhci_set_clock,
312 .platform_send_init_74_clocks = pxav3_gen_init_74_clocks,
313 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
314 .set_bus_width = sdhci_set_bus_width,
315 .reset = pxav3_reset,
316 .set_uhs_signaling = pxav3_set_uhs_signaling,
317 };
318
319 static struct sdhci_pltfm_data sdhci_pxav3_pdata = {
320 .quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK
321 | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
322 | SDHCI_QUIRK_32BIT_ADMA_SIZE
323 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
324 .ops = &pxav3_sdhci_ops,
325 };
326
327 #ifdef CONFIG_OF
328 static const struct of_device_id sdhci_pxav3_of_match[] = {
329 {
330 .compatible = "mrvl,pxav3-mmc",
331 },
332 {
333 .compatible = "marvell,armada-380-sdhci",
334 },
335 {},
336 };
337 MODULE_DEVICE_TABLE(of, sdhci_pxav3_of_match);
338
339 static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)
340 {
341 struct sdhci_pxa_platdata *pdata;
342 struct device_node *np = dev->of_node;
343 u32 clk_delay_cycles;
344
345 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
346 if (!pdata)
347 return NULL;
348
349 if (!of_property_read_u32(np, "mrvl,clk-delay-cycles",
350 &clk_delay_cycles))
351 pdata->clk_delay_cycles = clk_delay_cycles;
352
353 return pdata;
354 }
355 #else
356 static inline struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)
357 {
358 return NULL;
359 }
360 #endif
361
362 static int sdhci_pxav3_probe(struct platform_device *pdev)
363 {
364 struct sdhci_pltfm_host *pltfm_host;
365 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
366 struct device *dev = &pdev->dev;
367 struct device_node *np = pdev->dev.of_node;
368 struct sdhci_host *host = NULL;
369 struct sdhci_pxa *pxa = NULL;
370 const struct of_device_id *match;
371 int ret;
372
373 pxa = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_pxa), GFP_KERNEL);
374 if (!pxa)
375 return -ENOMEM;
376
377 host = sdhci_pltfm_init(pdev, &sdhci_pxav3_pdata, 0);
378 if (IS_ERR(host))
379 return PTR_ERR(host);
380
381 pltfm_host = sdhci_priv(host);
382 pltfm_host->priv = pxa;
383
384 pxa->clk_io = devm_clk_get(dev, "io");
385 if (IS_ERR(pxa->clk_io))
386 pxa->clk_io = devm_clk_get(dev, NULL);
387 if (IS_ERR(pxa->clk_io)) {
388 dev_err(dev, "failed to get io clock\n");
389 ret = PTR_ERR(pxa->clk_io);
390 goto err_clk_get;
391 }
392 pltfm_host->clk = pxa->clk_io;
393 clk_prepare_enable(pxa->clk_io);
394
395 pxa->clk_core = devm_clk_get(dev, "core");
396 if (!IS_ERR(pxa->clk_core))
397 clk_prepare_enable(pxa->clk_core);
398
399 /* enable 1/8V DDR capable */
400 host->mmc->caps |= MMC_CAP_1_8V_DDR;
401
402 if (of_device_is_compatible(np, "marvell,armada-380-sdhci")) {
403 ret = armada_38x_quirks(pdev, host);
404 if (ret < 0)
405 goto err_mbus_win;
406 ret = mv_conf_mbus_windows(pdev, mv_mbus_dram_info());
407 if (ret < 0)
408 goto err_mbus_win;
409 }
410
411 match = of_match_device(of_match_ptr(sdhci_pxav3_of_match), &pdev->dev);
412 if (match) {
413 ret = mmc_of_parse(host->mmc);
414 if (ret)
415 goto err_of_parse;
416 sdhci_get_of_property(pdev);
417 pdata = pxav3_get_mmc_pdata(dev);
418 pdev->dev.platform_data = pdata;
419 } else if (pdata) {
420 /* on-chip device */
421 if (pdata->flags & PXA_FLAG_CARD_PERMANENT)
422 host->mmc->caps |= MMC_CAP_NONREMOVABLE;
423
424 /* If slot design supports 8 bit data, indicate this to MMC. */
425 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
426 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
427
428 if (pdata->quirks)
429 host->quirks |= pdata->quirks;
430 if (pdata->quirks2)
431 host->quirks2 |= pdata->quirks2;
432 if (pdata->host_caps)
433 host->mmc->caps |= pdata->host_caps;
434 if (pdata->host_caps2)
435 host->mmc->caps2 |= pdata->host_caps2;
436 if (pdata->pm_caps)
437 host->mmc->pm_caps |= pdata->pm_caps;
438
439 if (gpio_is_valid(pdata->ext_cd_gpio)) {
440 ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio,
441 0);
442 if (ret) {
443 dev_err(mmc_dev(host->mmc),
444 "failed to allocate card detect gpio\n");
445 goto err_cd_req;
446 }
447 }
448 }
449
450 pm_runtime_get_noresume(&pdev->dev);
451 pm_runtime_set_active(&pdev->dev);
452 pm_runtime_set_autosuspend_delay(&pdev->dev, PXAV3_RPM_DELAY_MS);
453 pm_runtime_use_autosuspend(&pdev->dev);
454 pm_runtime_enable(&pdev->dev);
455 pm_suspend_ignore_children(&pdev->dev, 1);
456
457 ret = sdhci_add_host(host);
458 if (ret) {
459 dev_err(&pdev->dev, "failed to add host\n");
460 goto err_add_host;
461 }
462
463 platform_set_drvdata(pdev, host);
464
465 if (host->mmc->pm_caps & MMC_PM_WAKE_SDIO_IRQ)
466 device_init_wakeup(&pdev->dev, 1);
467
468 pm_runtime_put_autosuspend(&pdev->dev);
469
470 return 0;
471
472 err_add_host:
473 pm_runtime_disable(&pdev->dev);
474 pm_runtime_put_noidle(&pdev->dev);
475 err_of_parse:
476 err_cd_req:
477 err_mbus_win:
478 clk_disable_unprepare(pxa->clk_io);
479 clk_disable_unprepare(pxa->clk_core);
480 err_clk_get:
481 sdhci_pltfm_free(pdev);
482 return ret;
483 }
484
485 static int sdhci_pxav3_remove(struct platform_device *pdev)
486 {
487 struct sdhci_host *host = platform_get_drvdata(pdev);
488 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
489 struct sdhci_pxa *pxa = pltfm_host->priv;
490
491 pm_runtime_get_sync(&pdev->dev);
492 pm_runtime_disable(&pdev->dev);
493 pm_runtime_put_noidle(&pdev->dev);
494
495 sdhci_remove_host(host, 1);
496
497 clk_disable_unprepare(pxa->clk_io);
498 clk_disable_unprepare(pxa->clk_core);
499
500 sdhci_pltfm_free(pdev);
501
502 return 0;
503 }
504
505 #ifdef CONFIG_PM_SLEEP
506 static int sdhci_pxav3_suspend(struct device *dev)
507 {
508 int ret;
509 struct sdhci_host *host = dev_get_drvdata(dev);
510
511 pm_runtime_get_sync(dev);
512 ret = sdhci_suspend_host(host);
513 pm_runtime_mark_last_busy(dev);
514 pm_runtime_put_autosuspend(dev);
515
516 return ret;
517 }
518
519 static int sdhci_pxav3_resume(struct device *dev)
520 {
521 int ret;
522 struct sdhci_host *host = dev_get_drvdata(dev);
523
524 pm_runtime_get_sync(dev);
525 ret = sdhci_resume_host(host);
526 pm_runtime_mark_last_busy(dev);
527 pm_runtime_put_autosuspend(dev);
528
529 return ret;
530 }
531 #endif
532
533 #ifdef CONFIG_PM
534 static int sdhci_pxav3_runtime_suspend(struct device *dev)
535 {
536 struct sdhci_host *host = dev_get_drvdata(dev);
537 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
538 struct sdhci_pxa *pxa = pltfm_host->priv;
539 int ret;
540
541 ret = sdhci_runtime_suspend_host(host);
542 if (ret)
543 return ret;
544
545 clk_disable_unprepare(pxa->clk_io);
546 if (!IS_ERR(pxa->clk_core))
547 clk_disable_unprepare(pxa->clk_core);
548
549 return 0;
550 }
551
552 static int sdhci_pxav3_runtime_resume(struct device *dev)
553 {
554 struct sdhci_host *host = dev_get_drvdata(dev);
555 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
556 struct sdhci_pxa *pxa = pltfm_host->priv;
557
558 clk_prepare_enable(pxa->clk_io);
559 if (!IS_ERR(pxa->clk_core))
560 clk_prepare_enable(pxa->clk_core);
561
562 return sdhci_runtime_resume_host(host);
563 }
564 #endif
565
566 #ifdef CONFIG_PM
567 static const struct dev_pm_ops sdhci_pxav3_pmops = {
568 SET_SYSTEM_SLEEP_PM_OPS(sdhci_pxav3_suspend, sdhci_pxav3_resume)
569 SET_RUNTIME_PM_OPS(sdhci_pxav3_runtime_suspend,
570 sdhci_pxav3_runtime_resume, NULL)
571 };
572
573 #define SDHCI_PXAV3_PMOPS (&sdhci_pxav3_pmops)
574
575 #else
576 #define SDHCI_PXAV3_PMOPS NULL
577 #endif
578
579 static struct platform_driver sdhci_pxav3_driver = {
580 .driver = {
581 .name = "sdhci-pxav3",
582 .of_match_table = of_match_ptr(sdhci_pxav3_of_match),
583 .pm = SDHCI_PXAV3_PMOPS,
584 },
585 .probe = sdhci_pxav3_probe,
586 .remove = sdhci_pxav3_remove,
587 };
588
589 module_platform_driver(sdhci_pxav3_driver);
590
591 MODULE_DESCRIPTION("SDHCI driver for pxav3");
592 MODULE_AUTHOR("Marvell International Ltd.");
593 MODULE_LICENSE("GPL v2");
594
Linux kernel - Deliverables
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