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f52d9c4f PG |
1 | /* |
2 | * Support for SDHCI on STMicroelectronics SoCs | |
3 | * | |
4 | * Copyright (C) 2014 STMicroelectronics Ltd | |
5 | * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> | |
6 | * Contributors: Peter Griffin <peter.griffin@linaro.org> | |
7 | * | |
8 | * Based on sdhci-cns3xxx.c | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/io.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/err.h> | |
25 | #include <linux/mmc/host.h> | |
406c2431 | 26 | #include <linux/reset.h> |
f52d9c4f PG |
27 | #include "sdhci-pltfm.h" |
28 | ||
406c2431 PG |
29 | struct st_mmc_platform_data { |
30 | struct reset_control *rstc; | |
31 | void __iomem *top_ioaddr; | |
32 | }; | |
33 | ||
8bef7178 PG |
34 | /* MMCSS glue logic to setup the HC on some ST SoCs (e.g. STiH407 family) */ |
35 | ||
36 | #define ST_MMC_CCONFIG_REG_1 0x400 | |
37 | #define ST_MMC_CCONFIG_TIMEOUT_CLK_UNIT BIT(24) | |
38 | #define ST_MMC_CCONFIG_TIMEOUT_CLK_FREQ BIT(12) | |
39 | #define ST_MMC_CCONFIG_TUNING_COUNT_DEFAULT BIT(8) | |
40 | #define ST_MMC_CCONFIG_ASYNC_WAKEUP BIT(0) | |
41 | #define ST_MMC_CCONFIG_1_DEFAULT \ | |
42 | ((ST_MMC_CCONFIG_TIMEOUT_CLK_UNIT) | \ | |
43 | (ST_MMC_CCONFIG_TIMEOUT_CLK_FREQ) | \ | |
44 | (ST_MMC_CCONFIG_TUNING_COUNT_DEFAULT)) | |
45 | ||
46 | #define ST_MMC_CCONFIG_REG_2 0x404 | |
47 | #define ST_MMC_CCONFIG_HIGH_SPEED BIT(28) | |
48 | #define ST_MMC_CCONFIG_ADMA2 BIT(24) | |
49 | #define ST_MMC_CCONFIG_8BIT BIT(20) | |
50 | #define ST_MMC_CCONFIG_MAX_BLK_LEN 16 | |
51 | #define MAX_BLK_LEN_1024 1 | |
52 | #define MAX_BLK_LEN_2048 2 | |
53 | #define BASE_CLK_FREQ_200 0xc8 | |
54 | #define BASE_CLK_FREQ_100 0x64 | |
55 | #define BASE_CLK_FREQ_50 0x32 | |
56 | #define ST_MMC_CCONFIG_2_DEFAULT \ | |
57 | (ST_MMC_CCONFIG_HIGH_SPEED | ST_MMC_CCONFIG_ADMA2 | \ | |
58 | ST_MMC_CCONFIG_8BIT | \ | |
59 | (MAX_BLK_LEN_1024 << ST_MMC_CCONFIG_MAX_BLK_LEN)) | |
60 | ||
61 | #define ST_MMC_CCONFIG_REG_3 0x408 | |
62 | #define ST_MMC_CCONFIG_EMMC_SLOT_TYPE BIT(28) | |
63 | #define ST_MMC_CCONFIG_64BIT BIT(24) | |
64 | #define ST_MMC_CCONFIG_ASYNCH_INTR_SUPPORT BIT(20) | |
65 | #define ST_MMC_CCONFIG_1P8_VOLT BIT(16) | |
66 | #define ST_MMC_CCONFIG_3P0_VOLT BIT(12) | |
67 | #define ST_MMC_CCONFIG_3P3_VOLT BIT(8) | |
68 | #define ST_MMC_CCONFIG_SUSP_RES_SUPPORT BIT(4) | |
69 | #define ST_MMC_CCONFIG_SDMA BIT(0) | |
70 | #define ST_MMC_CCONFIG_3_DEFAULT \ | |
71 | (ST_MMC_CCONFIG_ASYNCH_INTR_SUPPORT | \ | |
72 | ST_MMC_CCONFIG_3P3_VOLT | \ | |
73 | ST_MMC_CCONFIG_SUSP_RES_SUPPORT | \ | |
74 | ST_MMC_CCONFIG_SDMA) | |
75 | ||
76 | #define ST_MMC_CCONFIG_REG_4 0x40c | |
77 | #define ST_MMC_CCONFIG_D_DRIVER BIT(20) | |
78 | #define ST_MMC_CCONFIG_C_DRIVER BIT(16) | |
79 | #define ST_MMC_CCONFIG_A_DRIVER BIT(12) | |
80 | #define ST_MMC_CCONFIG_DDR50 BIT(8) | |
81 | #define ST_MMC_CCONFIG_SDR104 BIT(4) | |
82 | #define ST_MMC_CCONFIG_SDR50 BIT(0) | |
83 | #define ST_MMC_CCONFIG_4_DEFAULT 0 | |
84 | ||
85 | #define ST_MMC_CCONFIG_REG_5 0x410 | |
86 | #define ST_MMC_CCONFIG_TUNING_FOR_SDR50 BIT(8) | |
87 | #define RETUNING_TIMER_CNT_MAX 0xf | |
88 | #define ST_MMC_CCONFIG_5_DEFAULT 0 | |
89 | ||
90 | /* I/O configuration for Arasan IP */ | |
91 | #define ST_MMC_GP_OUTPUT 0x450 | |
92 | #define ST_MMC_GP_OUTPUT_CD BIT(12) | |
93 | ||
94 | #define ST_MMC_STATUS_R 0x460 | |
95 | ||
96 | #define ST_TOP_MMC_DLY_FIX_OFF(x) (x - 0x8) | |
97 | ||
98 | /* TOP config registers to manage static and dynamic delay */ | |
99 | #define ST_TOP_MMC_TX_CLK_DLY ST_TOP_MMC_DLY_FIX_OFF(0x8) | |
100 | #define ST_TOP_MMC_RX_CLK_DLY ST_TOP_MMC_DLY_FIX_OFF(0xc) | |
101 | /* MMC delay control register */ | |
102 | #define ST_TOP_MMC_DLY_CTRL ST_TOP_MMC_DLY_FIX_OFF(0x18) | |
103 | #define ST_TOP_MMC_DLY_CTRL_DLL_BYPASS_CMD BIT(0) | |
104 | #define ST_TOP_MMC_DLY_CTRL_DLL_BYPASS_PH_SEL BIT(1) | |
105 | #define ST_TOP_MMC_DLY_CTRL_TX_DLL_ENABLE BIT(8) | |
106 | #define ST_TOP_MMC_DLY_CTRL_RX_DLL_ENABLE BIT(9) | |
107 | #define ST_TOP_MMC_DLY_CTRL_ATUNE_NOT_CFG_DLY BIT(10) | |
108 | #define ST_TOP_MMC_START_DLL_LOCK BIT(11) | |
109 | ||
110 | /* register to provide the phase-shift value for DLL */ | |
111 | #define ST_TOP_MMC_TX_DLL_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x1c) | |
112 | #define ST_TOP_MMC_RX_DLL_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x20) | |
113 | #define ST_TOP_MMC_RX_CMD_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x24) | |
114 | ||
115 | /* phase shift delay on the tx clk 2.188ns */ | |
116 | #define ST_TOP_MMC_TX_DLL_STEP_DLY_VALID 0x6 | |
117 | ||
118 | #define ST_TOP_MMC_DLY_MAX 0xf | |
119 | ||
120 | #define ST_TOP_MMC_DYN_DLY_CONF \ | |
121 | (ST_TOP_MMC_DLY_CTRL_TX_DLL_ENABLE | \ | |
122 | ST_TOP_MMC_DLY_CTRL_ATUNE_NOT_CFG_DLY | \ | |
123 | ST_TOP_MMC_START_DLL_LOCK) | |
124 | ||
bfa44804 PG |
125 | /* |
126 | * For clock speeds greater than 90MHz, we need to check that the | |
127 | * DLL procedure has finished before switching to ultra-speed modes. | |
128 | */ | |
129 | #define CLK_TO_CHECK_DLL_LOCK 90000000 | |
130 | ||
131 | static inline void st_mmcss_set_static_delay(void __iomem *ioaddr) | |
132 | { | |
133 | if (!ioaddr) | |
134 | return; | |
135 | ||
136 | writel_relaxed(0x0, ioaddr + ST_TOP_MMC_DLY_CTRL); | |
137 | writel_relaxed(ST_TOP_MMC_DLY_MAX, | |
138 | ioaddr + ST_TOP_MMC_TX_CLK_DLY); | |
139 | } | |
140 | ||
2053812f PG |
141 | /** |
142 | * st_mmcss_cconfig: configure the Arasan HC inside the flashSS. | |
143 | * @np: dt device node. | |
144 | * @host: sdhci host | |
145 | * Description: this function is to configure the Arasan host controller. | |
146 | * On some ST SoCs, i.e. STiH407 family, the MMC devices inside a dedicated | |
147 | * flashSS sub-system which needs to be configured to be compliant to eMMC 4.5 | |
148 | * or eMMC4.3. This has to be done before registering the sdhci host. | |
149 | */ | |
150 | static void st_mmcss_cconfig(struct device_node *np, struct sdhci_host *host) | |
151 | { | |
152 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
153 | struct mmc_host *mhost = host->mmc; | |
154 | u32 cconf2, cconf3, cconf4, cconf5; | |
155 | ||
156 | if (!of_device_is_compatible(np, "st,sdhci-stih407")) | |
157 | return; | |
158 | ||
159 | cconf2 = ST_MMC_CCONFIG_2_DEFAULT; | |
160 | cconf3 = ST_MMC_CCONFIG_3_DEFAULT; | |
161 | cconf4 = ST_MMC_CCONFIG_4_DEFAULT; | |
162 | cconf5 = ST_MMC_CCONFIG_5_DEFAULT; | |
163 | ||
164 | writel_relaxed(ST_MMC_CCONFIG_1_DEFAULT, | |
165 | host->ioaddr + ST_MMC_CCONFIG_REG_1); | |
166 | ||
167 | /* Set clock frequency, default to 50MHz if max-frequency is not | |
168 | * provided */ | |
169 | ||
170 | switch (mhost->f_max) { | |
171 | case 200000000: | |
172 | clk_set_rate(pltfm_host->clk, mhost->f_max); | |
173 | cconf2 |= BASE_CLK_FREQ_200; | |
174 | break; | |
175 | case 100000000: | |
176 | clk_set_rate(pltfm_host->clk, mhost->f_max); | |
177 | cconf2 |= BASE_CLK_FREQ_100; | |
178 | break; | |
179 | default: | |
180 | clk_set_rate(pltfm_host->clk, 50000000); | |
181 | cconf2 |= BASE_CLK_FREQ_50; | |
182 | } | |
183 | ||
184 | writel_relaxed(cconf2, host->ioaddr + ST_MMC_CCONFIG_REG_2); | |
185 | ||
186 | if (mhost->caps & MMC_CAP_NONREMOVABLE) | |
187 | cconf3 |= ST_MMC_CCONFIG_EMMC_SLOT_TYPE; | |
188 | else | |
189 | /* CARD _D ET_CTRL */ | |
190 | writel_relaxed(ST_MMC_GP_OUTPUT_CD, | |
191 | host->ioaddr + ST_MMC_GP_OUTPUT); | |
192 | ||
193 | if (mhost->caps & MMC_CAP_UHS_SDR50) { | |
194 | /* use 1.8V */ | |
195 | cconf3 |= ST_MMC_CCONFIG_1P8_VOLT; | |
196 | cconf4 |= ST_MMC_CCONFIG_SDR50; | |
197 | /* Use tuning */ | |
198 | cconf5 |= ST_MMC_CCONFIG_TUNING_FOR_SDR50; | |
199 | /* Max timeout for retuning */ | |
200 | cconf5 |= RETUNING_TIMER_CNT_MAX; | |
201 | } | |
202 | ||
203 | if (mhost->caps & MMC_CAP_UHS_SDR104) { | |
204 | /* | |
205 | * SDR104 implies the HC can support HS200 mode, so | |
206 | * it's mandatory to use 1.8V | |
207 | */ | |
208 | cconf3 |= ST_MMC_CCONFIG_1P8_VOLT; | |
209 | cconf4 |= ST_MMC_CCONFIG_SDR104; | |
210 | /* Max timeout for retuning */ | |
211 | cconf5 |= RETUNING_TIMER_CNT_MAX; | |
212 | } | |
213 | ||
214 | if (mhost->caps & MMC_CAP_UHS_DDR50) | |
215 | cconf4 |= ST_MMC_CCONFIG_DDR50; | |
216 | ||
217 | writel_relaxed(cconf3, host->ioaddr + ST_MMC_CCONFIG_REG_3); | |
218 | writel_relaxed(cconf4, host->ioaddr + ST_MMC_CCONFIG_REG_4); | |
219 | writel_relaxed(cconf5, host->ioaddr + ST_MMC_CCONFIG_REG_5); | |
220 | } | |
221 | ||
bfa44804 PG |
222 | static inline void st_mmcss_set_dll(void __iomem *ioaddr) |
223 | { | |
224 | if (!ioaddr) | |
225 | return; | |
226 | ||
227 | writel_relaxed(ST_TOP_MMC_DYN_DLY_CONF, ioaddr + ST_TOP_MMC_DLY_CTRL); | |
228 | writel_relaxed(ST_TOP_MMC_TX_DLL_STEP_DLY_VALID, | |
229 | ioaddr + ST_TOP_MMC_TX_DLL_STEP_DLY); | |
230 | } | |
231 | ||
232 | static int st_mmcss_lock_dll(void __iomem *ioaddr) | |
233 | { | |
234 | unsigned long curr, value; | |
235 | unsigned long finish = jiffies + HZ; | |
236 | ||
237 | /* Checks if the DLL procedure is finished */ | |
238 | do { | |
239 | curr = jiffies; | |
240 | value = readl(ioaddr + ST_MMC_STATUS_R); | |
241 | if (value & 0x1) | |
242 | return 0; | |
243 | ||
244 | cpu_relax(); | |
245 | } while (!time_after_eq(curr, finish)); | |
246 | ||
247 | return -EBUSY; | |
248 | } | |
249 | ||
250 | static int sdhci_st_set_dll_for_clock(struct sdhci_host *host) | |
251 | { | |
252 | int ret = 0; | |
253 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
15316752 | 254 | struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host); |
bfa44804 PG |
255 | |
256 | if (host->clock > CLK_TO_CHECK_DLL_LOCK) { | |
257 | st_mmcss_set_dll(pdata->top_ioaddr); | |
258 | ret = st_mmcss_lock_dll(host->ioaddr); | |
259 | } | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
cf48d32e PG |
264 | static void sdhci_st_set_uhs_signaling(struct sdhci_host *host, |
265 | unsigned int uhs) | |
266 | { | |
267 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
15316752 | 268 | struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host); |
cf48d32e PG |
269 | u16 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); |
270 | int ret = 0; | |
271 | ||
272 | /* Select Bus Speed Mode for host */ | |
273 | ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; | |
274 | switch (uhs) { | |
275 | /* | |
276 | * Set V18_EN -- UHS modes do not work without this. | |
277 | * does not change signaling voltage | |
278 | */ | |
279 | ||
280 | case MMC_TIMING_UHS_SDR12: | |
281 | st_mmcss_set_static_delay(pdata->top_ioaddr); | |
282 | ctrl_2 |= SDHCI_CTRL_UHS_SDR12 | SDHCI_CTRL_VDD_180; | |
283 | break; | |
284 | case MMC_TIMING_UHS_SDR25: | |
285 | st_mmcss_set_static_delay(pdata->top_ioaddr); | |
286 | ctrl_2 |= SDHCI_CTRL_UHS_SDR25 | SDHCI_CTRL_VDD_180; | |
287 | break; | |
288 | case MMC_TIMING_UHS_SDR50: | |
289 | st_mmcss_set_static_delay(pdata->top_ioaddr); | |
290 | ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180; | |
291 | ret = sdhci_st_set_dll_for_clock(host); | |
292 | break; | |
293 | case MMC_TIMING_UHS_SDR104: | |
294 | case MMC_TIMING_MMC_HS200: | |
295 | st_mmcss_set_static_delay(pdata->top_ioaddr); | |
296 | ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180; | |
297 | ret = sdhci_st_set_dll_for_clock(host); | |
298 | break; | |
299 | case MMC_TIMING_UHS_DDR50: | |
300 | case MMC_TIMING_MMC_DDR52: | |
301 | st_mmcss_set_static_delay(pdata->top_ioaddr); | |
302 | ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180; | |
303 | break; | |
304 | } | |
305 | ||
306 | if (ret) | |
307 | dev_warn(mmc_dev(host->mmc), "Error setting dll for clock " | |
308 | "(uhs %d)\n", uhs); | |
309 | ||
310 | dev_dbg(mmc_dev(host->mmc), "uhs %d, ctrl_2 %04X\n", uhs, ctrl_2); | |
311 | ||
312 | sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); | |
313 | } | |
bfa44804 | 314 | |
f52d9c4f PG |
315 | static u32 sdhci_st_readl(struct sdhci_host *host, int reg) |
316 | { | |
317 | u32 ret; | |
318 | ||
319 | switch (reg) { | |
320 | case SDHCI_CAPABILITIES: | |
321 | ret = readl_relaxed(host->ioaddr + reg); | |
322 | /* Support 3.3V and 1.8V */ | |
323 | ret &= ~SDHCI_CAN_VDD_300; | |
324 | break; | |
325 | default: | |
326 | ret = readl_relaxed(host->ioaddr + reg); | |
327 | } | |
328 | return ret; | |
329 | } | |
330 | ||
331 | static const struct sdhci_ops sdhci_st_ops = { | |
332 | .get_max_clock = sdhci_pltfm_clk_get_max_clock, | |
333 | .set_clock = sdhci_set_clock, | |
334 | .set_bus_width = sdhci_set_bus_width, | |
335 | .read_l = sdhci_st_readl, | |
336 | .reset = sdhci_reset, | |
cf48d32e | 337 | .set_uhs_signaling = sdhci_st_set_uhs_signaling, |
f52d9c4f PG |
338 | }; |
339 | ||
340 | static const struct sdhci_pltfm_data sdhci_st_pdata = { | |
341 | .ops = &sdhci_st_ops, | |
342 | .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | | |
4e187d31 PG |
343 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN | |
344 | SDHCI_QUIRK_NO_HISPD_BIT, | |
345 | .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | | |
346 | SDHCI_QUIRK2_STOP_WITH_TC, | |
f52d9c4f PG |
347 | }; |
348 | ||
349 | ||
350 | static int sdhci_st_probe(struct platform_device *pdev) | |
351 | { | |
2053812f | 352 | struct device_node *np = pdev->dev.of_node; |
f52d9c4f | 353 | struct sdhci_host *host; |
406c2431 | 354 | struct st_mmc_platform_data *pdata; |
f52d9c4f PG |
355 | struct sdhci_pltfm_host *pltfm_host; |
356 | struct clk *clk; | |
357 | int ret = 0; | |
358 | u16 host_version; | |
406c2431 | 359 | struct resource *res; |
15316752 | 360 | struct reset_control *rstc; |
f52d9c4f PG |
361 | |
362 | clk = devm_clk_get(&pdev->dev, "mmc"); | |
363 | if (IS_ERR(clk)) { | |
364 | dev_err(&pdev->dev, "Peripheral clk not found\n"); | |
365 | return PTR_ERR(clk); | |
366 | } | |
367 | ||
15316752 JZ |
368 | rstc = devm_reset_control_get(&pdev->dev, NULL); |
369 | if (IS_ERR(rstc)) | |
370 | rstc = NULL; | |
406c2431 | 371 | else |
15316752 | 372 | reset_control_deassert(rstc); |
406c2431 | 373 | |
15316752 | 374 | host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, sizeof(*pdata)); |
f52d9c4f PG |
375 | if (IS_ERR(host)) { |
376 | dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n"); | |
406c2431 PG |
377 | ret = PTR_ERR(host); |
378 | goto err_pltfm_init; | |
f52d9c4f PG |
379 | } |
380 | ||
15316752 JZ |
381 | pltfm_host = sdhci_priv(host); |
382 | pdata = sdhci_pltfm_priv(pltfm_host); | |
383 | pdata->rstc = rstc; | |
384 | ||
f52d9c4f | 385 | ret = mmc_of_parse(host->mmc); |
f52d9c4f PG |
386 | if (ret) { |
387 | dev_err(&pdev->dev, "Failed mmc_of_parse\n"); | |
fc702cb3 | 388 | goto err_of; |
f52d9c4f PG |
389 | } |
390 | ||
391 | clk_prepare_enable(clk); | |
392 | ||
406c2431 PG |
393 | /* Configure the FlashSS Top registers for setting eMMC TX/RX delay */ |
394 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, | |
395 | "top-mmc-delay"); | |
396 | pdata->top_ioaddr = devm_ioremap_resource(&pdev->dev, res); | |
397 | if (IS_ERR(pdata->top_ioaddr)) { | |
398 | dev_warn(&pdev->dev, "FlashSS Top Dly registers not available"); | |
399 | pdata->top_ioaddr = NULL; | |
400 | } | |
401 | ||
f52d9c4f PG |
402 | pltfm_host->clk = clk; |
403 | ||
2053812f PG |
404 | /* Configure the Arasan HC inside the flashSS */ |
405 | st_mmcss_cconfig(np, host); | |
406 | ||
f52d9c4f PG |
407 | ret = sdhci_add_host(host); |
408 | if (ret) { | |
409 | dev_err(&pdev->dev, "Failed sdhci_add_host\n"); | |
410 | goto err_out; | |
411 | } | |
412 | ||
413 | platform_set_drvdata(pdev, host); | |
414 | ||
415 | host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION)); | |
416 | ||
417 | dev_info(&pdev->dev, "SDHCI ST Initialised: Host Version: 0x%x Vendor Version 0x%x\n", | |
418 | ((host_version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT), | |
419 | ((host_version & SDHCI_VENDOR_VER_MASK) >> | |
420 | SDHCI_VENDOR_VER_SHIFT)); | |
421 | ||
422 | return 0; | |
423 | ||
424 | err_out: | |
425 | clk_disable_unprepare(clk); | |
fc702cb3 | 426 | err_of: |
f52d9c4f | 427 | sdhci_pltfm_free(pdev); |
406c2431 | 428 | err_pltfm_init: |
15316752 JZ |
429 | if (rstc) |
430 | reset_control_assert(rstc); | |
406c2431 PG |
431 | |
432 | return ret; | |
433 | } | |
434 | ||
435 | static int sdhci_st_remove(struct platform_device *pdev) | |
436 | { | |
437 | struct sdhci_host *host = platform_get_drvdata(pdev); | |
438 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
15316752 JZ |
439 | struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host); |
440 | struct reset_control *rstc = pdata->rstc; | |
406c2431 PG |
441 | int ret; |
442 | ||
443 | ret = sdhci_pltfm_unregister(pdev); | |
444 | ||
15316752 JZ |
445 | if (rstc) |
446 | reset_control_assert(rstc); | |
f52d9c4f PG |
447 | |
448 | return ret; | |
449 | } | |
450 | ||
f52d9c4f PG |
451 | #ifdef CONFIG_PM_SLEEP |
452 | static int sdhci_st_suspend(struct device *dev) | |
453 | { | |
454 | struct sdhci_host *host = dev_get_drvdata(dev); | |
455 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
15316752 | 456 | struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host); |
f52d9c4f PG |
457 | int ret = sdhci_suspend_host(host); |
458 | ||
459 | if (ret) | |
460 | goto out; | |
461 | ||
406c2431 PG |
462 | if (pdata->rstc) |
463 | reset_control_assert(pdata->rstc); | |
464 | ||
f52d9c4f PG |
465 | clk_disable_unprepare(pltfm_host->clk); |
466 | out: | |
467 | return ret; | |
468 | } | |
469 | ||
470 | static int sdhci_st_resume(struct device *dev) | |
471 | { | |
472 | struct sdhci_host *host = dev_get_drvdata(dev); | |
473 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); | |
15316752 | 474 | struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host); |
2053812f | 475 | struct device_node *np = dev->of_node; |
f52d9c4f PG |
476 | |
477 | clk_prepare_enable(pltfm_host->clk); | |
478 | ||
406c2431 PG |
479 | if (pdata->rstc) |
480 | reset_control_deassert(pdata->rstc); | |
481 | ||
2053812f PG |
482 | st_mmcss_cconfig(np, host); |
483 | ||
f52d9c4f PG |
484 | return sdhci_resume_host(host); |
485 | } | |
486 | #endif | |
487 | ||
488 | static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume); | |
489 | ||
490 | static const struct of_device_id st_sdhci_match[] = { | |
491 | { .compatible = "st,sdhci" }, | |
492 | {}, | |
493 | }; | |
494 | ||
495 | MODULE_DEVICE_TABLE(of, st_sdhci_match); | |
496 | ||
497 | static struct platform_driver sdhci_st_driver = { | |
498 | .probe = sdhci_st_probe, | |
406c2431 | 499 | .remove = sdhci_st_remove, |
f52d9c4f PG |
500 | .driver = { |
501 | .name = "sdhci-st", | |
502 | .pm = &sdhci_st_pmops, | |
503 | .of_match_table = of_match_ptr(st_sdhci_match), | |
504 | }, | |
505 | }; | |
506 | ||
507 | module_platform_driver(sdhci_st_driver); | |
508 | ||
509 | MODULE_DESCRIPTION("SDHCI driver for STMicroelectronics SoCs"); | |
510 | MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>"); | |
511 | MODULE_LICENSE("GPL v2"); | |
e6ac184b | 512 | MODULE_ALIAS("platform:sdhci-st"); |