Commit | Line | Data |
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e3ec3a3d SB |
1 | /* |
2 | * Arasan Secure Digital Host Controller Interface. | |
3 | * Copyright (C) 2011 - 2012 Michal Simek <monstr@monstr.eu> | |
4 | * Copyright (c) 2012 Wind River Systems, Inc. | |
5 | * Copyright (C) 2013 Pengutronix e.K. | |
6 | * Copyright (C) 2013 Xilinx Inc. | |
7 | * | |
8 | * Based on sdhci-of-esdhc.c | |
9 | * | |
10 | * Copyright (c) 2007 Freescale Semiconductor, Inc. | |
11 | * Copyright (c) 2009 MontaVista Software, Inc. | |
12 | * | |
13 | * Authors: Xiaobo Xie <X.Xie@freescale.com> | |
14 | * Anton Vorontsov <avorontsov@ru.mvista.com> | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or (at | |
19 | * your option) any later version. | |
20 | */ | |
21 | ||
c390f211 | 22 | #include <linux/clk-provider.h> |
3ea4666e | 23 | #include <linux/mfd/syscon.h> |
e3ec3a3d | 24 | #include <linux/module.h> |
308f3f8d | 25 | #include <linux/of_device.h> |
91aa3661 | 26 | #include <linux/phy/phy.h> |
3ea4666e | 27 | #include <linux/regmap.h> |
e3ec3a3d | 28 | #include "sdhci-pltfm.h" |
3794c542 | 29 | #include <linux/of.h> |
e3ec3a3d | 30 | |
a05c8465 | 31 | #define SDHCI_ARASAN_VENDOR_REGISTER 0x78 |
e3ec3a3d | 32 | |
a05c8465 | 33 | #define VENDOR_ENHANCED_STROBE BIT(0) |
e3ec3a3d | 34 | |
b2db9c67 DA |
35 | #define PHY_CLK_TOO_SLOW_HZ 400000 |
36 | ||
3ea4666e DA |
37 | /* |
38 | * On some SoCs the syscon area has a feature where the upper 16-bits of | |
39 | * each 32-bit register act as a write mask for the lower 16-bits. This allows | |
40 | * atomic updates of the register without locking. This macro is used on SoCs | |
41 | * that have that feature. | |
42 | */ | |
43 | #define HIWORD_UPDATE(val, mask, shift) \ | |
44 | ((val) << (shift) | (mask) << ((shift) + 16)) | |
45 | ||
46 | /** | |
47 | * struct sdhci_arasan_soc_ctl_field - Field used in sdhci_arasan_soc_ctl_map | |
48 | * | |
49 | * @reg: Offset within the syscon of the register containing this field | |
50 | * @width: Number of bits for this field | |
51 | * @shift: Bit offset within @reg of this field (or -1 if not avail) | |
52 | */ | |
53 | struct sdhci_arasan_soc_ctl_field { | |
54 | u32 reg; | |
55 | u16 width; | |
56 | s16 shift; | |
57 | }; | |
58 | ||
59 | /** | |
60 | * struct sdhci_arasan_soc_ctl_map - Map in syscon to corecfg registers | |
61 | * | |
62 | * It's up to the licensee of the Arsan IP block to make these available | |
63 | * somewhere if needed. Presumably these will be scattered somewhere that's | |
64 | * accessible via the syscon API. | |
65 | * | |
66 | * @baseclkfreq: Where to find corecfg_baseclkfreq | |
b2ca77c9 | 67 | * @clockmultiplier: Where to find corecfg_clockmultiplier |
3ea4666e DA |
68 | * @hiword_update: If true, use HIWORD_UPDATE to access the syscon |
69 | */ | |
70 | struct sdhci_arasan_soc_ctl_map { | |
71 | struct sdhci_arasan_soc_ctl_field baseclkfreq; | |
b2ca77c9 | 72 | struct sdhci_arasan_soc_ctl_field clockmultiplier; |
3ea4666e DA |
73 | bool hiword_update; |
74 | }; | |
75 | ||
e3ec3a3d SB |
76 | /** |
77 | * struct sdhci_arasan_data | |
c390f211 | 78 | * @host: Pointer to the main SDHCI host structure. |
3ea4666e DA |
79 | * @clk_ahb: Pointer to the AHB clock |
80 | * @phy: Pointer to the generic phy | |
b2db9c67 | 81 | * @is_phy_on: True if the PHY is on; false if not. |
c390f211 DA |
82 | * @sdcardclk_hw: Struct for the clock we might provide to a PHY. |
83 | * @sdcardclk: Pointer to normal 'struct clock' for sdcardclk_hw. | |
3ea4666e DA |
84 | * @soc_ctl_base: Pointer to regmap for syscon for soc_ctl registers. |
85 | * @soc_ctl_map: Map to get offsets into soc_ctl registers. | |
e3ec3a3d SB |
86 | */ |
87 | struct sdhci_arasan_data { | |
c390f211 | 88 | struct sdhci_host *host; |
e3ec3a3d | 89 | struct clk *clk_ahb; |
91aa3661 | 90 | struct phy *phy; |
b2db9c67 | 91 | bool is_phy_on; |
3ea4666e | 92 | |
c390f211 DA |
93 | struct clk_hw sdcardclk_hw; |
94 | struct clk *sdcardclk; | |
95 | ||
3ea4666e DA |
96 | struct regmap *soc_ctl_base; |
97 | const struct sdhci_arasan_soc_ctl_map *soc_ctl_map; | |
3794c542 ZB |
98 | unsigned int quirks; /* Arasan deviations from spec */ |
99 | ||
100 | /* Controller does not have CD wired and will not function normally without */ | |
101 | #define SDHCI_ARASAN_QUIRK_FORCE_CDTEST BIT(0) | |
3ea4666e DA |
102 | }; |
103 | ||
104 | static const struct sdhci_arasan_soc_ctl_map rk3399_soc_ctl_map = { | |
105 | .baseclkfreq = { .reg = 0xf000, .width = 8, .shift = 8 }, | |
b2ca77c9 | 106 | .clockmultiplier = { .reg = 0xf02c, .width = 8, .shift = 0}, |
3ea4666e | 107 | .hiword_update = true, |
e3ec3a3d SB |
108 | }; |
109 | ||
3ea4666e DA |
110 | /** |
111 | * sdhci_arasan_syscon_write - Write to a field in soc_ctl registers | |
112 | * | |
113 | * This function allows writing to fields in sdhci_arasan_soc_ctl_map. | |
114 | * Note that if a field is specified as not available (shift < 0) then | |
115 | * this function will silently return an error code. It will be noisy | |
116 | * and print errors for any other (unexpected) errors. | |
117 | * | |
118 | * @host: The sdhci_host | |
119 | * @fld: The field to write to | |
120 | * @val: The value to write | |
121 | */ | |
122 | static int sdhci_arasan_syscon_write(struct sdhci_host *host, | |
123 | const struct sdhci_arasan_soc_ctl_field *fld, | |
124 | u32 val) | |
125 | { | |
126 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
127 | struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); | |
128 | struct regmap *soc_ctl_base = sdhci_arasan->soc_ctl_base; | |
129 | u32 reg = fld->reg; | |
130 | u16 width = fld->width; | |
131 | s16 shift = fld->shift; | |
132 | int ret; | |
133 | ||
134 | /* | |
135 | * Silently return errors for shift < 0 so caller doesn't have | |
136 | * to check for fields which are optional. For fields that | |
137 | * are required then caller needs to do something special | |
138 | * anyway. | |
139 | */ | |
140 | if (shift < 0) | |
141 | return -EINVAL; | |
142 | ||
143 | if (sdhci_arasan->soc_ctl_map->hiword_update) | |
144 | ret = regmap_write(soc_ctl_base, reg, | |
145 | HIWORD_UPDATE(val, GENMASK(width, 0), | |
146 | shift)); | |
147 | else | |
148 | ret = regmap_update_bits(soc_ctl_base, reg, | |
149 | GENMASK(shift + width, shift), | |
150 | val << shift); | |
151 | ||
152 | /* Yell about (unexpected) regmap errors */ | |
153 | if (ret) | |
154 | pr_warn("%s: Regmap write fail: %d\n", | |
155 | mmc_hostname(host->mmc), ret); | |
156 | ||
157 | return ret; | |
158 | } | |
159 | ||
802ac39a SL |
160 | static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) |
161 | { | |
162 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
163 | struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); | |
6fc09244 | 164 | bool ctrl_phy = false; |
802ac39a | 165 | |
b2db9c67 DA |
166 | if (!IS_ERR(sdhci_arasan->phy)) { |
167 | if (!sdhci_arasan->is_phy_on && clock <= PHY_CLK_TOO_SLOW_HZ) { | |
168 | /* | |
169 | * If PHY off, set clock to max speed and power PHY on. | |
170 | * | |
171 | * Although PHY docs apparently suggest power cycling | |
172 | * when changing the clock the PHY doesn't like to be | |
173 | * powered on while at low speeds like those used in ID | |
174 | * mode. Even worse is powering the PHY on while the | |
175 | * clock is off. | |
176 | * | |
177 | * To workaround the PHY limitations, the best we can | |
178 | * do is to power it on at a faster speed and then slam | |
179 | * through low speeds without power cycling. | |
180 | */ | |
181 | sdhci_set_clock(host, host->max_clk); | |
b2db9c67 | 182 | phy_power_on(sdhci_arasan->phy); |
b2db9c67 DA |
183 | sdhci_arasan->is_phy_on = true; |
184 | ||
185 | /* | |
186 | * We'll now fall through to the below case with | |
187 | * ctrl_phy = false (so we won't turn off/on). The | |
188 | * sdhci_set_clock() will set the real clock. | |
189 | */ | |
190 | } else if (clock > PHY_CLK_TOO_SLOW_HZ) { | |
191 | /* | |
192 | * At higher clock speeds the PHY is fine being power | |
193 | * cycled and docs say you _should_ power cycle when | |
194 | * changing clock speeds. | |
195 | */ | |
196 | ctrl_phy = true; | |
197 | } | |
198 | } | |
802ac39a | 199 | |
b2db9c67 | 200 | if (ctrl_phy && sdhci_arasan->is_phy_on) { |
802ac39a | 201 | phy_power_off(sdhci_arasan->phy); |
b2db9c67 | 202 | sdhci_arasan->is_phy_on = false; |
802ac39a SL |
203 | } |
204 | ||
205 | sdhci_set_clock(host, clock); | |
206 | ||
6fc09244 | 207 | if (ctrl_phy) { |
802ac39a | 208 | phy_power_on(sdhci_arasan->phy); |
b2db9c67 | 209 | sdhci_arasan->is_phy_on = true; |
802ac39a SL |
210 | } |
211 | } | |
212 | ||
a05c8465 SL |
213 | static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc, |
214 | struct mmc_ios *ios) | |
215 | { | |
216 | u32 vendor; | |
217 | struct sdhci_host *host = mmc_priv(mmc); | |
218 | ||
0daf72fe | 219 | vendor = sdhci_readl(host, SDHCI_ARASAN_VENDOR_REGISTER); |
a05c8465 SL |
220 | if (ios->enhanced_strobe) |
221 | vendor |= VENDOR_ENHANCED_STROBE; | |
222 | else | |
223 | vendor &= ~VENDOR_ENHANCED_STROBE; | |
224 | ||
0daf72fe | 225 | sdhci_writel(host, vendor, SDHCI_ARASAN_VENDOR_REGISTER); |
a05c8465 SL |
226 | } |
227 | ||
13d62fd2 | 228 | static void sdhci_arasan_reset(struct sdhci_host *host, u8 mask) |
3794c542 ZB |
229 | { |
230 | u8 ctrl; | |
231 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
232 | struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); | |
233 | ||
234 | sdhci_reset(host, mask); | |
235 | ||
236 | if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_FORCE_CDTEST) { | |
237 | ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); | |
238 | ctrl |= SDHCI_CTRL_CDTEST_INS | SDHCI_CTRL_CDTEST_EN; | |
239 | sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); | |
240 | } | |
241 | } | |
242 | ||
8a3bee9b SL |
243 | static int sdhci_arasan_voltage_switch(struct mmc_host *mmc, |
244 | struct mmc_ios *ios) | |
245 | { | |
246 | switch (ios->signal_voltage) { | |
247 | case MMC_SIGNAL_VOLTAGE_180: | |
248 | /* | |
249 | * Plese don't switch to 1V8 as arasan,5.1 doesn't | |
250 | * actually refer to this setting to indicate the | |
251 | * signal voltage and the state machine will be broken | |
252 | * actually if we force to enable 1V8. That's something | |
253 | * like broken quirk but we could work around here. | |
254 | */ | |
255 | return 0; | |
256 | case MMC_SIGNAL_VOLTAGE_330: | |
257 | case MMC_SIGNAL_VOLTAGE_120: | |
258 | /* We don't support 3V3 and 1V2 */ | |
259 | break; | |
260 | } | |
261 | ||
262 | return -EINVAL; | |
263 | } | |
264 | ||
a81dae3a | 265 | static const struct sdhci_ops sdhci_arasan_ops = { |
802ac39a | 266 | .set_clock = sdhci_arasan_set_clock, |
e3ec3a3d | 267 | .get_max_clock = sdhci_pltfm_clk_get_max_clock, |
8cc35289 | 268 | .get_timeout_clock = sdhci_pltfm_clk_get_max_clock, |
2317f56c | 269 | .set_bus_width = sdhci_set_bus_width, |
3794c542 | 270 | .reset = sdhci_arasan_reset, |
96d7b78c | 271 | .set_uhs_signaling = sdhci_set_uhs_signaling, |
e3ec3a3d SB |
272 | }; |
273 | ||
a81dae3a | 274 | static const struct sdhci_pltfm_data sdhci_arasan_pdata = { |
e3ec3a3d | 275 | .ops = &sdhci_arasan_ops, |
2d532d45 SG |
276 | .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, |
277 | .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | | |
278 | SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN, | |
e3ec3a3d SB |
279 | }; |
280 | ||
281 | #ifdef CONFIG_PM_SLEEP | |
282 | /** | |
283 | * sdhci_arasan_suspend - Suspend method for the driver | |
284 | * @dev: Address of the device structure | |
285 | * Returns 0 on success and error value on error | |
286 | * | |
287 | * Put the device in a low power state. | |
288 | */ | |
289 | static int sdhci_arasan_suspend(struct device *dev) | |
290 | { | |
291 | struct platform_device *pdev = to_platform_device(dev); | |
292 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
293 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
89211418 | 294 | struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); |
e3ec3a3d SB |
295 | int ret; |
296 | ||
d38dcad4 AH |
297 | if (host->tuning_mode != SDHCI_TUNING_MODE_3) |
298 | mmc_retune_needed(host->mmc); | |
299 | ||
e3ec3a3d SB |
300 | ret = sdhci_suspend_host(host); |
301 | if (ret) | |
302 | return ret; | |
303 | ||
b2db9c67 | 304 | if (!IS_ERR(sdhci_arasan->phy) && sdhci_arasan->is_phy_on) { |
91aa3661 SL |
305 | ret = phy_power_off(sdhci_arasan->phy); |
306 | if (ret) { | |
307 | dev_err(dev, "Cannot power off phy.\n"); | |
308 | sdhci_resume_host(host); | |
309 | return ret; | |
310 | } | |
b2db9c67 | 311 | sdhci_arasan->is_phy_on = false; |
91aa3661 SL |
312 | } |
313 | ||
e3ec3a3d SB |
314 | clk_disable(pltfm_host->clk); |
315 | clk_disable(sdhci_arasan->clk_ahb); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | /** | |
321 | * sdhci_arasan_resume - Resume method for the driver | |
322 | * @dev: Address of the device structure | |
323 | * Returns 0 on success and error value on error | |
324 | * | |
325 | * Resume operation after suspend | |
326 | */ | |
327 | static int sdhci_arasan_resume(struct device *dev) | |
328 | { | |
329 | struct platform_device *pdev = to_platform_device(dev); | |
330 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
331 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
89211418 | 332 | struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); |
e3ec3a3d SB |
333 | int ret; |
334 | ||
335 | ret = clk_enable(sdhci_arasan->clk_ahb); | |
336 | if (ret) { | |
337 | dev_err(dev, "Cannot enable AHB clock.\n"); | |
338 | return ret; | |
339 | } | |
340 | ||
341 | ret = clk_enable(pltfm_host->clk); | |
342 | if (ret) { | |
343 | dev_err(dev, "Cannot enable SD clock.\n"); | |
e3ec3a3d SB |
344 | return ret; |
345 | } | |
346 | ||
b2db9c67 | 347 | if (!IS_ERR(sdhci_arasan->phy) && host->mmc->actual_clock) { |
91aa3661 SL |
348 | ret = phy_power_on(sdhci_arasan->phy); |
349 | if (ret) { | |
350 | dev_err(dev, "Cannot power on phy.\n"); | |
351 | return ret; | |
352 | } | |
b2db9c67 | 353 | sdhci_arasan->is_phy_on = true; |
91aa3661 SL |
354 | } |
355 | ||
e3ec3a3d SB |
356 | return sdhci_resume_host(host); |
357 | } | |
358 | #endif /* ! CONFIG_PM_SLEEP */ | |
359 | ||
360 | static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend, | |
361 | sdhci_arasan_resume); | |
362 | ||
3ea4666e DA |
363 | static const struct of_device_id sdhci_arasan_of_match[] = { |
364 | /* SoC-specific compatible strings w/ soc_ctl_map */ | |
365 | { | |
366 | .compatible = "rockchip,rk3399-sdhci-5.1", | |
367 | .data = &rk3399_soc_ctl_map, | |
368 | }, | |
369 | ||
370 | /* Generic compatible below here */ | |
371 | { .compatible = "arasan,sdhci-8.9a" }, | |
372 | { .compatible = "arasan,sdhci-5.1" }, | |
373 | { .compatible = "arasan,sdhci-4.9a" }, | |
374 | ||
375 | { /* sentinel */ } | |
376 | }; | |
377 | MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match); | |
378 | ||
c390f211 DA |
379 | /** |
380 | * sdhci_arasan_sdcardclk_recalc_rate - Return the card clock rate | |
381 | * | |
382 | * Return the current actual rate of the SD card clock. This can be used | |
383 | * to communicate with out PHY. | |
384 | * | |
385 | * @hw: Pointer to the hardware clock structure. | |
386 | * @parent_rate The parent rate (should be rate of clk_xin). | |
387 | * Returns the card clock rate. | |
388 | */ | |
389 | static unsigned long sdhci_arasan_sdcardclk_recalc_rate(struct clk_hw *hw, | |
390 | unsigned long parent_rate) | |
391 | ||
392 | { | |
393 | struct sdhci_arasan_data *sdhci_arasan = | |
394 | container_of(hw, struct sdhci_arasan_data, sdcardclk_hw); | |
395 | struct sdhci_host *host = sdhci_arasan->host; | |
396 | ||
397 | return host->mmc->actual_clock; | |
398 | } | |
399 | ||
400 | static const struct clk_ops arasan_sdcardclk_ops = { | |
401 | .recalc_rate = sdhci_arasan_sdcardclk_recalc_rate, | |
402 | }; | |
403 | ||
b2ca77c9 SL |
404 | /** |
405 | * sdhci_arasan_update_clockmultiplier - Set corecfg_clockmultiplier | |
406 | * | |
407 | * The corecfg_clockmultiplier is supposed to contain clock multiplier | |
408 | * value of programmable clock generator. | |
409 | * | |
410 | * NOTES: | |
411 | * - Many existing devices don't seem to do this and work fine. To keep | |
412 | * compatibility for old hardware where the device tree doesn't provide a | |
413 | * register map, this function is a noop if a soc_ctl_map hasn't been provided | |
414 | * for this platform. | |
415 | * - The value of corecfg_clockmultiplier should sync with that of corresponding | |
416 | * value reading from sdhci_capability_register. So this function is called | |
417 | * once at probe time and never called again. | |
418 | * | |
419 | * @host: The sdhci_host | |
420 | */ | |
421 | static void sdhci_arasan_update_clockmultiplier(struct sdhci_host *host, | |
422 | u32 value) | |
423 | { | |
424 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
425 | struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); | |
426 | const struct sdhci_arasan_soc_ctl_map *soc_ctl_map = | |
427 | sdhci_arasan->soc_ctl_map; | |
428 | ||
429 | /* Having a map is optional */ | |
430 | if (!soc_ctl_map) | |
431 | return; | |
432 | ||
433 | /* If we have a map, we expect to have a syscon */ | |
434 | if (!sdhci_arasan->soc_ctl_base) { | |
435 | pr_warn("%s: Have regmap, but no soc-ctl-syscon\n", | |
436 | mmc_hostname(host->mmc)); | |
437 | return; | |
438 | } | |
439 | ||
440 | sdhci_arasan_syscon_write(host, &soc_ctl_map->clockmultiplier, value); | |
441 | } | |
442 | ||
3ea4666e DA |
443 | /** |
444 | * sdhci_arasan_update_baseclkfreq - Set corecfg_baseclkfreq | |
445 | * | |
446 | * The corecfg_baseclkfreq is supposed to contain the MHz of clk_xin. This | |
447 | * function can be used to make that happen. | |
448 | * | |
449 | * NOTES: | |
450 | * - Many existing devices don't seem to do this and work fine. To keep | |
451 | * compatibility for old hardware where the device tree doesn't provide a | |
452 | * register map, this function is a noop if a soc_ctl_map hasn't been provided | |
453 | * for this platform. | |
454 | * - It's assumed that clk_xin is not dynamic and that we use the SDHCI divider | |
455 | * to achieve lower clock rates. That means that this function is called once | |
456 | * at probe time and never called again. | |
457 | * | |
458 | * @host: The sdhci_host | |
459 | */ | |
460 | static void sdhci_arasan_update_baseclkfreq(struct sdhci_host *host) | |
461 | { | |
462 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
463 | struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); | |
464 | const struct sdhci_arasan_soc_ctl_map *soc_ctl_map = | |
465 | sdhci_arasan->soc_ctl_map; | |
466 | u32 mhz = DIV_ROUND_CLOSEST(clk_get_rate(pltfm_host->clk), 1000000); | |
467 | ||
468 | /* Having a map is optional */ | |
469 | if (!soc_ctl_map) | |
470 | return; | |
471 | ||
472 | /* If we have a map, we expect to have a syscon */ | |
473 | if (!sdhci_arasan->soc_ctl_base) { | |
474 | pr_warn("%s: Have regmap, but no soc-ctl-syscon\n", | |
475 | mmc_hostname(host->mmc)); | |
476 | return; | |
477 | } | |
478 | ||
479 | sdhci_arasan_syscon_write(host, &soc_ctl_map->baseclkfreq, mhz); | |
480 | } | |
481 | ||
c390f211 DA |
482 | /** |
483 | * sdhci_arasan_register_sdclk - Register the sdclk for a PHY to use | |
484 | * | |
485 | * Some PHY devices need to know what the actual card clock is. In order for | |
486 | * them to find out, we'll provide a clock through the common clock framework | |
487 | * for them to query. | |
488 | * | |
489 | * Note: without seriously re-architecting SDHCI's clock code and testing on | |
490 | * all platforms, there's no way to create a totally beautiful clock here | |
491 | * with all clock ops implemented. Instead, we'll just create a clock that can | |
492 | * be queried and set the CLK_GET_RATE_NOCACHE attribute to tell common clock | |
493 | * framework that we're doing things behind its back. This should be sufficient | |
494 | * to create nice clean device tree bindings and later (if needed) we can try | |
495 | * re-architecting SDHCI if we see some benefit to it. | |
496 | * | |
497 | * @sdhci_arasan: Our private data structure. | |
498 | * @clk_xin: Pointer to the functional clock | |
499 | * @dev: Pointer to our struct device. | |
500 | * Returns 0 on success and error value on error | |
501 | */ | |
502 | static int sdhci_arasan_register_sdclk(struct sdhci_arasan_data *sdhci_arasan, | |
503 | struct clk *clk_xin, | |
504 | struct device *dev) | |
505 | { | |
506 | struct device_node *np = dev->of_node; | |
507 | struct clk_init_data sdcardclk_init; | |
508 | const char *parent_clk_name; | |
509 | int ret; | |
510 | ||
511 | /* Providing a clock to the PHY is optional; no error if missing */ | |
512 | if (!of_find_property(np, "#clock-cells", NULL)) | |
513 | return 0; | |
514 | ||
515 | ret = of_property_read_string_index(np, "clock-output-names", 0, | |
516 | &sdcardclk_init.name); | |
517 | if (ret) { | |
518 | dev_err(dev, "DT has #clock-cells but no clock-output-names\n"); | |
519 | return ret; | |
520 | } | |
521 | ||
522 | parent_clk_name = __clk_get_name(clk_xin); | |
523 | sdcardclk_init.parent_names = &parent_clk_name; | |
524 | sdcardclk_init.num_parents = 1; | |
525 | sdcardclk_init.flags = CLK_GET_RATE_NOCACHE; | |
526 | sdcardclk_init.ops = &arasan_sdcardclk_ops; | |
527 | ||
528 | sdhci_arasan->sdcardclk_hw.init = &sdcardclk_init; | |
529 | sdhci_arasan->sdcardclk = | |
530 | devm_clk_register(dev, &sdhci_arasan->sdcardclk_hw); | |
531 | sdhci_arasan->sdcardclk_hw.init = NULL; | |
532 | ||
533 | ret = of_clk_add_provider(np, of_clk_src_simple_get, | |
534 | sdhci_arasan->sdcardclk); | |
535 | if (ret) | |
536 | dev_err(dev, "Failed to add clock provider\n"); | |
537 | ||
538 | return ret; | |
539 | } | |
540 | ||
541 | /** | |
542 | * sdhci_arasan_unregister_sdclk - Undoes sdhci_arasan_register_sdclk() | |
543 | * | |
544 | * Should be called any time we're exiting and sdhci_arasan_register_sdclk() | |
545 | * returned success. | |
546 | * | |
547 | * @dev: Pointer to our struct device. | |
548 | */ | |
549 | static void sdhci_arasan_unregister_sdclk(struct device *dev) | |
550 | { | |
551 | struct device_node *np = dev->of_node; | |
552 | ||
553 | if (!of_find_property(np, "#clock-cells", NULL)) | |
554 | return; | |
555 | ||
556 | of_clk_del_provider(dev->of_node); | |
557 | } | |
558 | ||
e3ec3a3d SB |
559 | static int sdhci_arasan_probe(struct platform_device *pdev) |
560 | { | |
561 | int ret; | |
3ea4666e DA |
562 | const struct of_device_id *match; |
563 | struct device_node *node; | |
e3ec3a3d SB |
564 | struct clk *clk_xin; |
565 | struct sdhci_host *host; | |
566 | struct sdhci_pltfm_host *pltfm_host; | |
567 | struct sdhci_arasan_data *sdhci_arasan; | |
3794c542 | 568 | struct device_node *np = pdev->dev.of_node; |
e3ec3a3d | 569 | |
89211418 JZ |
570 | host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, |
571 | sizeof(*sdhci_arasan)); | |
572 | if (IS_ERR(host)) | |
573 | return PTR_ERR(host); | |
574 | ||
575 | pltfm_host = sdhci_priv(host); | |
576 | sdhci_arasan = sdhci_pltfm_priv(pltfm_host); | |
c390f211 | 577 | sdhci_arasan->host = host; |
e3ec3a3d | 578 | |
3ea4666e DA |
579 | match = of_match_node(sdhci_arasan_of_match, pdev->dev.of_node); |
580 | sdhci_arasan->soc_ctl_map = match->data; | |
581 | ||
582 | node = of_parse_phandle(pdev->dev.of_node, "arasan,soc-ctl-syscon", 0); | |
583 | if (node) { | |
584 | sdhci_arasan->soc_ctl_base = syscon_node_to_regmap(node); | |
585 | of_node_put(node); | |
586 | ||
587 | if (IS_ERR(sdhci_arasan->soc_ctl_base)) { | |
588 | ret = PTR_ERR(sdhci_arasan->soc_ctl_base); | |
589 | if (ret != -EPROBE_DEFER) | |
590 | dev_err(&pdev->dev, "Can't get syscon: %d\n", | |
591 | ret); | |
592 | goto err_pltfm_free; | |
593 | } | |
594 | } | |
595 | ||
e3ec3a3d SB |
596 | sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb"); |
597 | if (IS_ERR(sdhci_arasan->clk_ahb)) { | |
598 | dev_err(&pdev->dev, "clk_ahb clock not found.\n"); | |
278d0962 SL |
599 | ret = PTR_ERR(sdhci_arasan->clk_ahb); |
600 | goto err_pltfm_free; | |
e3ec3a3d SB |
601 | } |
602 | ||
603 | clk_xin = devm_clk_get(&pdev->dev, "clk_xin"); | |
604 | if (IS_ERR(clk_xin)) { | |
605 | dev_err(&pdev->dev, "clk_xin clock not found.\n"); | |
278d0962 SL |
606 | ret = PTR_ERR(clk_xin); |
607 | goto err_pltfm_free; | |
e3ec3a3d SB |
608 | } |
609 | ||
610 | ret = clk_prepare_enable(sdhci_arasan->clk_ahb); | |
611 | if (ret) { | |
612 | dev_err(&pdev->dev, "Unable to enable AHB clock.\n"); | |
278d0962 | 613 | goto err_pltfm_free; |
e3ec3a3d SB |
614 | } |
615 | ||
616 | ret = clk_prepare_enable(clk_xin); | |
617 | if (ret) { | |
618 | dev_err(&pdev->dev, "Unable to enable SD clock.\n"); | |
619 | goto clk_dis_ahb; | |
620 | } | |
621 | ||
e3ec3a3d | 622 | sdhci_get_of_property(pdev); |
3794c542 ZB |
623 | |
624 | if (of_property_read_bool(np, "xlnx,fails-without-test-cd")) | |
625 | sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_FORCE_CDTEST; | |
626 | ||
e3ec3a3d SB |
627 | pltfm_host->clk = clk_xin; |
628 | ||
b2ca77c9 SL |
629 | if (of_device_is_compatible(pdev->dev.of_node, |
630 | "rockchip,rk3399-sdhci-5.1")) | |
631 | sdhci_arasan_update_clockmultiplier(host, 0x0); | |
632 | ||
3ea4666e DA |
633 | sdhci_arasan_update_baseclkfreq(host); |
634 | ||
c390f211 DA |
635 | ret = sdhci_arasan_register_sdclk(sdhci_arasan, clk_xin, &pdev->dev); |
636 | if (ret) | |
637 | goto clk_disable_all; | |
638 | ||
16b23787 MS |
639 | ret = mmc_of_parse(host->mmc); |
640 | if (ret) { | |
940e698c | 641 | dev_err(&pdev->dev, "parsing dt failed (%d)\n", ret); |
c390f211 | 642 | goto unreg_clk; |
16b23787 MS |
643 | } |
644 | ||
91aa3661 SL |
645 | sdhci_arasan->phy = ERR_PTR(-ENODEV); |
646 | if (of_device_is_compatible(pdev->dev.of_node, | |
647 | "arasan,sdhci-5.1")) { | |
648 | sdhci_arasan->phy = devm_phy_get(&pdev->dev, | |
649 | "phy_arasan"); | |
650 | if (IS_ERR(sdhci_arasan->phy)) { | |
651 | ret = PTR_ERR(sdhci_arasan->phy); | |
652 | dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n"); | |
c390f211 | 653 | goto unreg_clk; |
91aa3661 SL |
654 | } |
655 | ||
656 | ret = phy_init(sdhci_arasan->phy); | |
657 | if (ret < 0) { | |
658 | dev_err(&pdev->dev, "phy_init err.\n"); | |
c390f211 | 659 | goto unreg_clk; |
91aa3661 SL |
660 | } |
661 | ||
a05c8465 SL |
662 | host->mmc_host_ops.hs400_enhanced_strobe = |
663 | sdhci_arasan_hs400_enhanced_strobe; | |
8a3bee9b SL |
664 | host->mmc_host_ops.start_signal_voltage_switch = |
665 | sdhci_arasan_voltage_switch; | |
91aa3661 SL |
666 | } |
667 | ||
e3ec3a3d | 668 | ret = sdhci_add_host(host); |
b1df9de7 | 669 | if (ret) |
91aa3661 | 670 | goto err_add_host; |
e3ec3a3d SB |
671 | |
672 | return 0; | |
673 | ||
91aa3661 | 674 | err_add_host: |
91aa3661 SL |
675 | if (!IS_ERR(sdhci_arasan->phy)) |
676 | phy_exit(sdhci_arasan->phy); | |
c390f211 DA |
677 | unreg_clk: |
678 | sdhci_arasan_unregister_sdclk(&pdev->dev); | |
e3ec3a3d SB |
679 | clk_disable_all: |
680 | clk_disable_unprepare(clk_xin); | |
681 | clk_dis_ahb: | |
682 | clk_disable_unprepare(sdhci_arasan->clk_ahb); | |
278d0962 SL |
683 | err_pltfm_free: |
684 | sdhci_pltfm_free(pdev); | |
e3ec3a3d SB |
685 | return ret; |
686 | } | |
687 | ||
688 | static int sdhci_arasan_remove(struct platform_device *pdev) | |
689 | { | |
0c7fe32e | 690 | int ret; |
e3ec3a3d SB |
691 | struct sdhci_host *host = platform_get_drvdata(pdev); |
692 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
89211418 JZ |
693 | struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); |
694 | struct clk *clk_ahb = sdhci_arasan->clk_ahb; | |
e3ec3a3d | 695 | |
91aa3661 | 696 | if (!IS_ERR(sdhci_arasan->phy)) { |
b2db9c67 DA |
697 | if (sdhci_arasan->is_phy_on) |
698 | phy_power_off(sdhci_arasan->phy); | |
91aa3661 SL |
699 | phy_exit(sdhci_arasan->phy); |
700 | } | |
701 | ||
c390f211 DA |
702 | sdhci_arasan_unregister_sdclk(&pdev->dev); |
703 | ||
0c7fe32e JZ |
704 | ret = sdhci_pltfm_unregister(pdev); |
705 | ||
89211418 | 706 | clk_disable_unprepare(clk_ahb); |
e3ec3a3d | 707 | |
0c7fe32e | 708 | return ret; |
e3ec3a3d SB |
709 | } |
710 | ||
e3ec3a3d SB |
711 | static struct platform_driver sdhci_arasan_driver = { |
712 | .driver = { | |
713 | .name = "sdhci-arasan", | |
e3ec3a3d SB |
714 | .of_match_table = sdhci_arasan_of_match, |
715 | .pm = &sdhci_arasan_dev_pm_ops, | |
716 | }, | |
717 | .probe = sdhci_arasan_probe, | |
718 | .remove = sdhci_arasan_remove, | |
719 | }; | |
720 | ||
721 | module_platform_driver(sdhci_arasan_driver); | |
722 | ||
723 | MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller"); | |
724 | MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>"); | |
725 | MODULE_LICENSE("GPL"); |