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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>
26#include <linux/reset.h>
27#include "sdhci-pltfm.h"
28
29struct st_mmc_platform_data {
30 struct reset_control *rstc;
31 void __iomem *top_ioaddr;
32};
33
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
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
131static 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
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 */
150static 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
222static 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
232static 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
250static 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);
254 struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
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
264static 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);
268 struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
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}
314
315static 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
331static 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,
337 .set_uhs_signaling = sdhci_st_set_uhs_signaling,
338};
339
340static const struct sdhci_pltfm_data sdhci_st_pdata = {
341 .ops = &sdhci_st_ops,
342 .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
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,
347};
348
349
350static int sdhci_st_probe(struct platform_device *pdev)
351{
352 struct device_node *np = pdev->dev.of_node;
353 struct sdhci_host *host;
354 struct st_mmc_platform_data *pdata;
355 struct sdhci_pltfm_host *pltfm_host;
356 struct clk *clk;
357 int ret = 0;
358 u16 host_version;
359 struct resource *res;
360 struct reset_control *rstc;
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
368 rstc = devm_reset_control_get(&pdev->dev, NULL);
369 if (IS_ERR(rstc))
370 rstc = NULL;
371 else
372 reset_control_deassert(rstc);
373
374 host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, sizeof(*pdata));
375 if (IS_ERR(host)) {
376 dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n");
377 ret = PTR_ERR(host);
378 goto err_pltfm_init;
379 }
380
381 pltfm_host = sdhci_priv(host);
382 pdata = sdhci_pltfm_priv(pltfm_host);
383 pdata->rstc = rstc;
384
385 ret = mmc_of_parse(host->mmc);
386 if (ret) {
387 dev_err(&pdev->dev, "Failed mmc_of_parse\n");
388 goto err_of;
389 }
390
391 clk_prepare_enable(clk);
392
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
402 pltfm_host->clk = clk;
403
404 /* Configure the Arasan HC inside the flashSS */
405 st_mmcss_cconfig(np, host);
406
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
424err_out:
425 clk_disable_unprepare(clk);
426err_of:
427 sdhci_pltfm_free(pdev);
428err_pltfm_init:
429 if (rstc)
430 reset_control_assert(rstc);
431
432 return ret;
433}
434
435static 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);
439 struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
440 struct reset_control *rstc = pdata->rstc;
441 int ret;
442
443 ret = sdhci_pltfm_unregister(pdev);
444
445 if (rstc)
446 reset_control_assert(rstc);
447
448 return ret;
449}
450
451#ifdef CONFIG_PM_SLEEP
452static 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);
456 struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
457 int ret = sdhci_suspend_host(host);
458
459 if (ret)
460 goto out;
461
462 if (pdata->rstc)
463 reset_control_assert(pdata->rstc);
464
465 clk_disable_unprepare(pltfm_host->clk);
466out:
467 return ret;
468}
469
470static 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);
474 struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
475 struct device_node *np = dev->of_node;
476
477 clk_prepare_enable(pltfm_host->clk);
478
479 if (pdata->rstc)
480 reset_control_deassert(pdata->rstc);
481
482 st_mmcss_cconfig(np, host);
483
484 return sdhci_resume_host(host);
485}
486#endif
487
488static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume);
489
490static const struct of_device_id st_sdhci_match[] = {
491 { .compatible = "st,sdhci" },
492 {},
493};
494
495MODULE_DEVICE_TABLE(of, st_sdhci_match);
496
497static struct platform_driver sdhci_st_driver = {
498 .probe = sdhci_st_probe,
499 .remove = sdhci_st_remove,
500 .driver = {
501 .name = "sdhci-st",
502 .pm = &sdhci_st_pmops,
503 .of_match_table = of_match_ptr(st_sdhci_match),
504 },
505};
506
507module_platform_driver(sdhci_st_driver);
508
509MODULE_DESCRIPTION("SDHCI driver for STMicroelectronics SoCs");
510MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
511MODULE_LICENSE("GPL v2");
512MODULE_ALIAS("platform:sdhci-st");