1 /*
2 * linux/arch/arm/mach-omap2/hsmmc.c
3 *
4 * Copyright (C) 2007-2008 Texas Instruments
5 * Copyright (C) 2008 Nokia Corporation
6 * Author: Texas Instruments
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/string.h>
15 #include <linux/delay.h>
16 #include <linux/gpio.h>
17 #include <linux/mmc/host.h>
18 #include <linux/platform_data/gpio-omap.h>
19 #include <linux/platform_data/hsmmc-omap.h>
20
21 #include "soc.h"
22 #include "omap_device.h"
23 #include "omap-pm.h"
24
25 #include "mux.h"
26 #include "hsmmc.h"
27 #include "control.h"
28
29 #if defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE)
30
31 static u16 control_pbias_offset;
32 static u16 control_devconf1_offset;
33
34 #define HSMMC_NAME_LEN 9
35
omap_hsmmc1_before_set_reg(struct device * dev,int power_on,int vdd)36 static void omap_hsmmc1_before_set_reg(struct device *dev,
37 int power_on, int vdd)
38 {
39 u32 reg, prog_io;
40 struct omap_hsmmc_platform_data *mmc = dev->platform_data;
41
42 if (mmc->remux)
43 mmc->remux(dev, power_on);
44
45 /*
46 * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
47 * card with Vcc regulator (from twl4030 or whatever). OMAP has both
48 * 1.8V and 3.0V modes, controlled by the PBIAS register.
49 *
50 * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
51 * is most naturally TWL VSIM; those pins also use PBIAS.
52 *
53 * FIXME handle VMMC1A as needed ...
54 */
55 if (power_on) {
56 if (cpu_is_omap2430()) {
57 reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
58 if ((1 << vdd) >= MMC_VDD_30_31)
59 reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
60 else
61 reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
62 omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
63 }
64
65 if (mmc->internal_clock) {
66 reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
67 reg |= OMAP2_MMCSDIO1ADPCLKISEL;
68 omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
69 }
70
71 reg = omap_ctrl_readl(control_pbias_offset);
72 if (cpu_is_omap3630()) {
73 /* Set MMC I/O to 52Mhz */
74 prog_io = omap_ctrl_readl(OMAP343X_CONTROL_PROG_IO1);
75 prog_io |= OMAP3630_PRG_SDMMC1_SPEEDCTRL;
76 omap_ctrl_writel(prog_io, OMAP343X_CONTROL_PROG_IO1);
77 } else {
78 reg |= OMAP2_PBIASSPEEDCTRL0;
79 }
80 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
81 omap_ctrl_writel(reg, control_pbias_offset);
82 } else {
83 reg = omap_ctrl_readl(control_pbias_offset);
84 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
85 omap_ctrl_writel(reg, control_pbias_offset);
86 }
87 }
88
omap_hsmmc1_after_set_reg(struct device * dev,int power_on,int vdd)89 static void omap_hsmmc1_after_set_reg(struct device *dev, int power_on, int vdd)
90 {
91 u32 reg;
92
93 /* 100ms delay required for PBIAS configuration */
94 msleep(100);
95
96 if (power_on) {
97 reg = omap_ctrl_readl(control_pbias_offset);
98 reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
99 if ((1 << vdd) <= MMC_VDD_165_195)
100 reg &= ~OMAP2_PBIASLITEVMODE0;
101 else
102 reg |= OMAP2_PBIASLITEVMODE0;
103 omap_ctrl_writel(reg, control_pbias_offset);
104 } else {
105 reg = omap_ctrl_readl(control_pbias_offset);
106 reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
107 OMAP2_PBIASLITEVMODE0);
108 omap_ctrl_writel(reg, control_pbias_offset);
109 }
110 }
111
hsmmc2_select_input_clk_src(struct omap_hsmmc_platform_data * mmc)112 static void hsmmc2_select_input_clk_src(struct omap_hsmmc_platform_data *mmc)
113 {
114 u32 reg;
115
116 reg = omap_ctrl_readl(control_devconf1_offset);
117 if (mmc->internal_clock)
118 reg |= OMAP2_MMCSDIO2ADPCLKISEL;
119 else
120 reg &= ~OMAP2_MMCSDIO2ADPCLKISEL;
121 omap_ctrl_writel(reg, control_devconf1_offset);
122 }
123
hsmmc2_before_set_reg(struct device * dev,int power_on,int vdd)124 static void hsmmc2_before_set_reg(struct device *dev, int power_on, int vdd)
125 {
126 struct omap_hsmmc_platform_data *mmc = dev->platform_data;
127
128 if (mmc->remux)
129 mmc->remux(dev, power_on);
130
131 if (power_on)
132 hsmmc2_select_input_clk_src(mmc);
133 }
134
am35x_hsmmc2_set_power(struct device * dev,int power_on,int vdd)135 static int am35x_hsmmc2_set_power(struct device *dev, int power_on, int vdd)
136 {
137 struct omap_hsmmc_platform_data *mmc = dev->platform_data;
138
139 if (power_on)
140 hsmmc2_select_input_clk_src(mmc);
141
142 return 0;
143 }
144
nop_mmc_set_power(struct device * dev,int power_on,int vdd)145 static int nop_mmc_set_power(struct device *dev, int power_on, int vdd)
146 {
147 return 0;
148 }
149
omap_hsmmc_mux(struct omap_hsmmc_platform_data * mmc_controller,int controller_nr)150 static inline void omap_hsmmc_mux(struct omap_hsmmc_platform_data
151 *mmc_controller, int controller_nr)
152 {
153 if (gpio_is_valid(mmc_controller->gpio_cd) &&
154 (mmc_controller->gpio_cd < OMAP_MAX_GPIO_LINES))
155 omap_mux_init_gpio(mmc_controller->gpio_cd,
156 OMAP_PIN_INPUT_PULLUP);
157 if (gpio_is_valid(mmc_controller->gpio_cod) &&
158 (mmc_controller->gpio_cod < OMAP_MAX_GPIO_LINES))
159 omap_mux_init_gpio(mmc_controller->gpio_cod,
160 OMAP_PIN_INPUT_PULLUP);
161 if (gpio_is_valid(mmc_controller->gpio_wp) &&
162 (mmc_controller->gpio_wp < OMAP_MAX_GPIO_LINES))
163 omap_mux_init_gpio(mmc_controller->gpio_wp,
164 OMAP_PIN_INPUT_PULLUP);
165 if (cpu_is_omap34xx()) {
166 if (controller_nr == 0) {
167 omap_mux_init_signal("sdmmc1_clk",
168 OMAP_PIN_INPUT_PULLUP);
169 omap_mux_init_signal("sdmmc1_cmd",
170 OMAP_PIN_INPUT_PULLUP);
171 omap_mux_init_signal("sdmmc1_dat0",
172 OMAP_PIN_INPUT_PULLUP);
173 if (mmc_controller->caps &
174 (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
175 omap_mux_init_signal("sdmmc1_dat1",
176 OMAP_PIN_INPUT_PULLUP);
177 omap_mux_init_signal("sdmmc1_dat2",
178 OMAP_PIN_INPUT_PULLUP);
179 omap_mux_init_signal("sdmmc1_dat3",
180 OMAP_PIN_INPUT_PULLUP);
181 }
182 if (mmc_controller->caps &
183 MMC_CAP_8_BIT_DATA) {
184 omap_mux_init_signal("sdmmc1_dat4",
185 OMAP_PIN_INPUT_PULLUP);
186 omap_mux_init_signal("sdmmc1_dat5",
187 OMAP_PIN_INPUT_PULLUP);
188 omap_mux_init_signal("sdmmc1_dat6",
189 OMAP_PIN_INPUT_PULLUP);
190 omap_mux_init_signal("sdmmc1_dat7",
191 OMAP_PIN_INPUT_PULLUP);
192 }
193 }
194 if (controller_nr == 1) {
195 /* MMC2 */
196 omap_mux_init_signal("sdmmc2_clk",
197 OMAP_PIN_INPUT_PULLUP);
198 omap_mux_init_signal("sdmmc2_cmd",
199 OMAP_PIN_INPUT_PULLUP);
200 omap_mux_init_signal("sdmmc2_dat0",
201 OMAP_PIN_INPUT_PULLUP);
202
203 /*
204 * For 8 wire configurations, Lines DAT4, 5, 6 and 7
205 * need to be muxed in the board-*.c files
206 */
207 if (mmc_controller->caps &
208 (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)) {
209 omap_mux_init_signal("sdmmc2_dat1",
210 OMAP_PIN_INPUT_PULLUP);
211 omap_mux_init_signal("sdmmc2_dat2",
212 OMAP_PIN_INPUT_PULLUP);
213 omap_mux_init_signal("sdmmc2_dat3",
214 OMAP_PIN_INPUT_PULLUP);
215 }
216 if (mmc_controller->caps &
217 MMC_CAP_8_BIT_DATA) {
218 omap_mux_init_signal("sdmmc2_dat4.sdmmc2_dat4",
219 OMAP_PIN_INPUT_PULLUP);
220 omap_mux_init_signal("sdmmc2_dat5.sdmmc2_dat5",
221 OMAP_PIN_INPUT_PULLUP);
222 omap_mux_init_signal("sdmmc2_dat6.sdmmc2_dat6",
223 OMAP_PIN_INPUT_PULLUP);
224 omap_mux_init_signal("sdmmc2_dat7.sdmmc2_dat7",
225 OMAP_PIN_INPUT_PULLUP);
226 }
227 }
228
229 /*
230 * For MMC3 the pins need to be muxed in the board-*.c files
231 */
232 }
233 }
234
omap_hsmmc_pdata_init(struct omap2_hsmmc_info * c,struct omap_hsmmc_platform_data * mmc)235 static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
236 struct omap_hsmmc_platform_data *mmc)
237 {
238 char *hc_name;
239
240 hc_name = kzalloc(sizeof(char) * (HSMMC_NAME_LEN + 1), GFP_KERNEL);
241 if (!hc_name) {
242 pr_err("Cannot allocate memory for controller slot name\n");
243 kfree(hc_name);
244 return -ENOMEM;
245 }
246
247 if (c->name)
248 strncpy(hc_name, c->name, HSMMC_NAME_LEN);
249 else
250 snprintf(hc_name, (HSMMC_NAME_LEN + 1), "mmc%islot%i",
251 c->mmc, 1);
252 mmc->name = hc_name;
253 mmc->caps = c->caps;
254 mmc->internal_clock = !c->ext_clock;
255 mmc->reg_offset = 0;
256
257 if (c->cover_only) {
258 /* detect if mobile phone cover removed */
259 mmc->gpio_cd = -EINVAL;
260 mmc->gpio_cod = c->gpio_cd;
261 } else {
262 /* card detect pin on the mmc socket itself */
263 mmc->gpio_cd = c->gpio_cd;
264 mmc->gpio_cod = -EINVAL;
265 }
266 mmc->gpio_wp = c->gpio_wp;
267
268 mmc->remux = c->remux;
269 mmc->init_card = c->init_card;
270
271 if (c->nonremovable)
272 mmc->nonremovable = 1;
273
274 /*
275 * NOTE: MMC slots should have a Vcc regulator set up.
276 * This may be from a TWL4030-family chip, another
277 * controllable regulator, or a fixed supply.
278 *
279 * temporary HACK: ocr_mask instead of fixed supply
280 */
281 if (soc_is_am35xx())
282 mmc->ocr_mask = MMC_VDD_165_195 |
283 MMC_VDD_26_27 |
284 MMC_VDD_27_28 |
285 MMC_VDD_29_30 |
286 MMC_VDD_30_31 |
287 MMC_VDD_31_32;
288 else
289 mmc->ocr_mask = c->ocr_mask;
290
291 if (!soc_is_am35xx())
292 mmc->features |= HSMMC_HAS_PBIAS;
293
294 switch (c->mmc) {
295 case 1:
296 if (mmc->features & HSMMC_HAS_PBIAS) {
297 /* on-chip level shifting via PBIAS0/PBIAS1 */
298 mmc->before_set_reg =
299 omap_hsmmc1_before_set_reg;
300 mmc->after_set_reg =
301 omap_hsmmc1_after_set_reg;
302 }
303
304 if (soc_is_am35xx())
305 mmc->set_power = nop_mmc_set_power;
306
307 /* OMAP3630 HSMMC1 supports only 4-bit */
308 if (cpu_is_omap3630() &&
309 (c->caps & MMC_CAP_8_BIT_DATA)) {
310 c->caps &= ~MMC_CAP_8_BIT_DATA;
311 c->caps |= MMC_CAP_4_BIT_DATA;
312 mmc->caps = c->caps;
313 }
314 break;
315 case 2:
316 if (soc_is_am35xx())
317 mmc->set_power = am35x_hsmmc2_set_power;
318
319 if (c->ext_clock)
320 c->transceiver = 1;
321 if (c->transceiver && (c->caps & MMC_CAP_8_BIT_DATA)) {
322 c->caps &= ~MMC_CAP_8_BIT_DATA;
323 c->caps |= MMC_CAP_4_BIT_DATA;
324 }
325 if (mmc->features & HSMMC_HAS_PBIAS) {
326 /* off-chip level shifting, or none */
327 mmc->before_set_reg = hsmmc2_before_set_reg;
328 mmc->after_set_reg = NULL;
329 }
330 break;
331 case 3:
332 case 4:
333 case 5:
334 mmc->before_set_reg = NULL;
335 mmc->after_set_reg = NULL;
336 break;
337 default:
338 pr_err("MMC%d configuration not supported!\n", c->mmc);
339 kfree(hc_name);
340 return -ENODEV;
341 }
342 return 0;
343 }
344
345 static int omap_hsmmc_done;
346
omap_hsmmc_late_init(struct omap2_hsmmc_info * c)347 void omap_hsmmc_late_init(struct omap2_hsmmc_info *c)
348 {
349 struct platform_device *pdev;
350 struct omap_hsmmc_platform_data *mmc_pdata;
351 int res;
352
353 if (omap_hsmmc_done != 1)
354 return;
355
356 omap_hsmmc_done++;
357
358 for (; c->mmc; c++) {
359 if (!c->deferred)
360 continue;
361
362 pdev = c->pdev;
363 if (!pdev)
364 continue;
365
366 mmc_pdata = pdev->dev.platform_data;
367 if (!mmc_pdata)
368 continue;
369
370 if (c->cover_only) {
371 /* detect if mobile phone cover removed */
372 mmc_pdata->gpio_cd = -EINVAL;
373 mmc_pdata->gpio_cod = c->gpio_cd;
374 } else {
375 /* card detect pin on the mmc socket itself */
376 mmc_pdata->gpio_cd = c->gpio_cd;
377 mmc_pdata->gpio_cod = -EINVAL;
378 }
379 mmc_pdata->gpio_wp = c->gpio_wp;
380
381 res = omap_device_register(pdev);
382 if (res)
383 pr_err("Could not late init MMC %s\n",
384 c->name);
385 }
386 }
387
388 #define MAX_OMAP_MMC_HWMOD_NAME_LEN 16
389
omap_hsmmc_init_one(struct omap2_hsmmc_info * hsmmcinfo,int ctrl_nr)390 static void __init omap_hsmmc_init_one(struct omap2_hsmmc_info *hsmmcinfo,
391 int ctrl_nr)
392 {
393 struct omap_hwmod *oh;
394 struct omap_hwmod *ohs[1];
395 struct omap_device *od;
396 struct platform_device *pdev;
397 char oh_name[MAX_OMAP_MMC_HWMOD_NAME_LEN];
398 struct omap_hsmmc_platform_data *mmc_data;
399 struct omap_hsmmc_dev_attr *mmc_dev_attr;
400 char *name;
401 int res;
402
403 mmc_data = kzalloc(sizeof(*mmc_data), GFP_KERNEL);
404 if (!mmc_data) {
405 pr_err("Cannot allocate memory for mmc device!\n");
406 return;
407 }
408
409 res = omap_hsmmc_pdata_init(hsmmcinfo, mmc_data);
410 if (res < 0)
411 goto free_mmc;
412
413 omap_hsmmc_mux(mmc_data, (ctrl_nr - 1));
414
415 name = "omap_hsmmc";
416 res = snprintf(oh_name, MAX_OMAP_MMC_HWMOD_NAME_LEN,
417 "mmc%d", ctrl_nr);
418 WARN(res >= MAX_OMAP_MMC_HWMOD_NAME_LEN,
419 "String buffer overflow in MMC%d device setup\n", ctrl_nr);
420
421 oh = omap_hwmod_lookup(oh_name);
422 if (!oh) {
423 pr_err("Could not look up %s\n", oh_name);
424 goto free_name;
425 }
426 ohs[0] = oh;
427 if (oh->dev_attr != NULL) {
428 mmc_dev_attr = oh->dev_attr;
429 mmc_data->controller_flags = mmc_dev_attr->flags;
430 /*
431 * erratum 2.1.1.128 doesn't apply if board has
432 * a transceiver is attached
433 */
434 if (hsmmcinfo->transceiver)
435 mmc_data->controller_flags &=
436 ~OMAP_HSMMC_BROKEN_MULTIBLOCK_READ;
437 }
438
439 pdev = platform_device_alloc(name, ctrl_nr - 1);
440 if (!pdev) {
441 pr_err("Could not allocate pdev for %s\n", name);
442 goto free_name;
443 }
444 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
445
446 od = omap_device_alloc(pdev, ohs, 1);
447 if (IS_ERR(od)) {
448 pr_err("Could not allocate od for %s\n", name);
449 goto put_pdev;
450 }
451
452 res = platform_device_add_data(pdev, mmc_data,
453 sizeof(struct omap_hsmmc_platform_data));
454 if (res) {
455 pr_err("Could not add pdata for %s\n", name);
456 goto put_pdev;
457 }
458
459 hsmmcinfo->pdev = pdev;
460
461 if (hsmmcinfo->deferred)
462 goto free_mmc;
463
464 res = omap_device_register(pdev);
465 if (res) {
466 pr_err("Could not register od for %s\n", name);
467 goto free_od;
468 }
469
470 goto free_mmc;
471
472 free_od:
473 omap_device_delete(od);
474
475 put_pdev:
476 platform_device_put(pdev);
477
478 free_name:
479 kfree(mmc_data->name);
480
481 free_mmc:
482 kfree(mmc_data);
483 }
484
omap_hsmmc_init(struct omap2_hsmmc_info * controllers)485 void __init omap_hsmmc_init(struct omap2_hsmmc_info *controllers)
486 {
487 if (omap_hsmmc_done)
488 return;
489
490 omap_hsmmc_done = 1;
491
492 if (cpu_is_omap2430()) {
493 control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
494 control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
495 } else {
496 control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
497 control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
498 }
499
500 for (; controllers->mmc; controllers++)
501 omap_hsmmc_init_one(controllers, controllers->mmc);
502
503 }
504
505 #endif
506