2 * linux/arch/arm/mach-omap2/mmc-twl4030.c
4 * Copyright (C) 2007-2008 Texas Instruments
5 * Copyright (C) 2008 Nokia Corporation
6 * Author: Texas Instruments
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.
12 #include <linux/err.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/gpio.h>
19 #include <linux/mmc/host.h>
20 #include <linux/regulator/consumer.h>
22 #include <mach/hardware.h>
23 #include <mach/control.h>
25 #include <mach/board.h>
27 #include "mmc-twl4030.h"
30 #if defined(CONFIG_REGULATOR) && \
31 (defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))
33 static u16 control_pbias_offset;
34 static u16 control_devconf1_offset;
36 #define HSMMC_NAME_LEN 9
38 static struct twl_mmc_controller {
39 struct omap_mmc_platform_data *mmc;
40 /* Vcc == configured supply
42 * - MMC1, supply for DAT4..DAT7
43 * - MMC2/MMC2, external level shifter voltage supply, for
44 * chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
46 struct regulator *vcc;
47 struct regulator *vcc_aux;
48 char name[HSMMC_NAME_LEN + 1];
49 } hsmmc[OMAP34XX_NR_MMC];
51 static int twl_mmc_card_detect(int irq)
55 for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
56 struct omap_mmc_platform_data *mmc;
61 if (irq != mmc->slots[0].card_detect_irq)
64 /* NOTE: assumes card detect signal is active-low */
65 return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
70 static int twl_mmc_get_ro(struct device *dev, int slot)
72 struct omap_mmc_platform_data *mmc = dev->platform_data;
74 /* NOTE: assumes write protect signal is active-high */
75 return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
78 static int twl_mmc_get_cover_state(struct device *dev, int slot)
80 struct omap_mmc_platform_data *mmc = dev->platform_data;
82 /* NOTE: assumes card detect signal is active-low */
83 return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
87 * MMC Slot Initialization.
89 static int twl_mmc_late_init(struct device *dev)
91 struct omap_mmc_platform_data *mmc = dev->platform_data;
95 /* MMC/SD/SDIO doesn't require a card detect switch */
96 if (gpio_is_valid(mmc->slots[0].switch_pin)) {
97 ret = gpio_request(mmc->slots[0].switch_pin, "mmc_cd");
100 ret = gpio_direction_input(mmc->slots[0].switch_pin);
105 /* require at least main regulator */
106 for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
107 if (hsmmc[i].name == mmc->slots[0].name) {
108 struct regulator *reg;
112 reg = regulator_get(dev, "vmmc");
114 dev_dbg(dev, "vmmc regulator missing\n");
115 /* HACK: until fixed.c regulator is usable,
116 * we don't require a main regulator
125 mmc->slots[0].ocr_mask = mmc_regulator_get_ocrmask(reg);
127 /* allow an aux regulator */
128 reg = regulator_get(dev, "vmmc_aux");
129 hsmmc[i].vcc_aux = IS_ERR(reg) ? NULL : reg;
138 gpio_free(mmc->slots[0].switch_pin);
140 mmc->slots[0].card_detect_irq = 0;
141 mmc->slots[0].card_detect = NULL;
143 dev_err(dev, "err %d configuring card detect\n", ret);
147 static void twl_mmc_cleanup(struct device *dev)
149 struct omap_mmc_platform_data *mmc = dev->platform_data;
151 gpio_free(mmc->slots[0].switch_pin);
156 static int twl_mmc_suspend(struct device *dev, int slot)
158 struct omap_mmc_platform_data *mmc = dev->platform_data;
160 disable_irq(mmc->slots[0].card_detect_irq);
164 static int twl_mmc_resume(struct device *dev, int slot)
166 struct omap_mmc_platform_data *mmc = dev->platform_data;
168 enable_irq(mmc->slots[0].card_detect_irq);
173 #define twl_mmc_suspend NULL
174 #define twl_mmc_resume NULL
177 static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
182 struct twl_mmc_controller *c = &hsmmc[0];
183 struct omap_mmc_platform_data *mmc = dev->platform_data;
186 * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
187 * card with Vcc regulator (from twl4030 or whatever). OMAP has both
188 * 1.8V and 3.0V modes, controlled by the PBIAS register.
190 * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
191 * is most naturally TWL VSIM; those pins also use PBIAS.
193 * FIXME handle VMMC1A as needed ...
196 if (cpu_is_omap2430()) {
197 reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
198 if ((1 << vdd) >= MMC_VDD_30_31)
199 reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
201 reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
202 omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
205 if (mmc->slots[0].internal_clock) {
206 reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
207 reg |= OMAP2_MMCSDIO1ADPCLKISEL;
208 omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
211 reg = omap_ctrl_readl(control_pbias_offset);
212 reg |= OMAP2_PBIASSPEEDCTRL0;
213 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
214 omap_ctrl_writel(reg, control_pbias_offset);
216 ret = mmc_regulator_set_ocr(c->vcc, vdd);
218 /* 100ms delay required for PBIAS configuration */
220 reg = omap_ctrl_readl(control_pbias_offset);
221 reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
222 if ((1 << vdd) <= MMC_VDD_165_195)
223 reg &= ~OMAP2_PBIASLITEVMODE0;
225 reg |= OMAP2_PBIASLITEVMODE0;
226 omap_ctrl_writel(reg, control_pbias_offset);
228 reg = omap_ctrl_readl(control_pbias_offset);
229 reg &= ~OMAP2_PBIASLITEPWRDNZ0;
230 omap_ctrl_writel(reg, control_pbias_offset);
232 ret = mmc_regulator_set_ocr(c->vcc, 0);
234 /* 100ms delay required for PBIAS configuration */
236 reg = omap_ctrl_readl(control_pbias_offset);
237 reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
238 OMAP2_PBIASLITEVMODE0);
239 omap_ctrl_writel(reg, control_pbias_offset);
245 static int twl_mmc23_set_power(struct device *dev, int slot, int power_on, int vdd)
248 struct twl_mmc_controller *c = &hsmmc[1];
249 struct omap_mmc_platform_data *mmc = dev->platform_data;
251 /* If we don't see a Vcc regulator, assume it's a fixed
252 * voltage always-on regulator.
258 * Assume Vcc regulator is used only to power the card ... OMAP
259 * VDDS is used to power the pins, optionally with a transceiver to
260 * support cards using voltages other than VDDS (1.8V nominal). When a
261 * transceiver is used, DAT3..7 are muxed as transceiver control pins.
263 * In some cases this regulator won't support enable/disable;
264 * e.g. it's a fixed rail for a WLAN chip.
266 * In other cases vcc_aux switches interface power. Example, for
267 * eMMC cards it represents VccQ. Sometimes transceivers or SDIO
268 * chips/cards need an interface voltage rail too.
271 /* only MMC2 supports a CLKIN */
272 if (mmc->slots[0].internal_clock) {
275 reg = omap_ctrl_readl(control_devconf1_offset);
276 reg |= OMAP2_MMCSDIO2ADPCLKISEL;
277 omap_ctrl_writel(reg, control_devconf1_offset);
279 ret = mmc_regulator_set_ocr(c->vcc, vdd);
280 /* enable interface voltage rail, if needed */
281 if (ret == 0 && c->vcc_aux) {
282 ret = regulator_enable(c->vcc_aux);
284 ret = mmc_regulator_set_ocr(c->vcc, 0);
288 ret = regulator_enable(c->vcc_aux);
290 ret = mmc_regulator_set_ocr(c->vcc, 0);
296 static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;
298 void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
300 struct twl4030_hsmmc_info *c;
301 int nr_hsmmc = ARRAY_SIZE(hsmmc_data);
303 if (cpu_is_omap2430()) {
304 control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
305 control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
308 control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
309 control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
312 for (c = controllers; c->mmc; c++) {
313 struct twl_mmc_controller *twl = hsmmc + c->mmc - 1;
314 struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
316 if (!c->mmc || c->mmc > nr_hsmmc) {
317 pr_debug("MMC%d: no such controller\n", c->mmc);
321 pr_debug("MMC%d: already configured\n", c->mmc);
325 mmc = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
327 pr_err("Cannot allocate memory for mmc device!\n");
332 strncpy(twl->name, c->name, HSMMC_NAME_LEN);
334 sprintf(twl->name, "mmc%islot%i", c->mmc, 1);
335 mmc->slots[0].name = twl->name;
337 mmc->slots[0].wires = c->wires;
338 mmc->slots[0].internal_clock = !c->ext_clock;
339 mmc->dma_mask = 0xffffffff;
340 mmc->init = twl_mmc_late_init;
342 /* note: twl4030 card detect GPIOs can disable VMMCx ... */
343 if (gpio_is_valid(c->gpio_cd)) {
344 mmc->cleanup = twl_mmc_cleanup;
345 mmc->suspend = twl_mmc_suspend;
346 mmc->resume = twl_mmc_resume;
348 mmc->slots[0].switch_pin = c->gpio_cd;
349 mmc->slots[0].card_detect_irq = gpio_to_irq(c->gpio_cd);
351 mmc->slots[0].get_cover_state = twl_mmc_get_cover_state;
353 mmc->slots[0].card_detect = twl_mmc_card_detect;
355 mmc->slots[0].switch_pin = -EINVAL;
357 /* write protect normally uses an OMAP gpio */
358 if (gpio_is_valid(c->gpio_wp)) {
359 gpio_request(c->gpio_wp, "mmc_wp");
360 gpio_direction_input(c->gpio_wp);
362 mmc->slots[0].gpio_wp = c->gpio_wp;
363 mmc->slots[0].get_ro = twl_mmc_get_ro;
365 mmc->slots[0].gpio_wp = -EINVAL;
367 /* NOTE: MMC slots should have a Vcc regulator set up.
368 * This may be from a TWL4030-family chip, another
369 * controllable regulator, or a fixed supply.
371 * temporary HACK: ocr_mask instead of fixed supply
373 mmc->slots[0].ocr_mask = c->ocr_mask;
377 /* on-chip level shifting via PBIAS0/PBIAS1 */
378 mmc->slots[0].set_power = twl_mmc1_set_power;
383 if (c->transceiver && c->wires > 4)
387 /* off-chip level shifting, or none */
388 mmc->slots[0].set_power = twl_mmc23_set_power;
391 pr_err("MMC%d configuration not supported!\n", c->mmc);
395 hsmmc_data[c->mmc - 1] = mmc;
398 omap2_init_mmc(hsmmc_data, OMAP34XX_NR_MMC);
400 /* pass the device nodes back to board setup code */
401 for (c = controllers; c->mmc; c++) {
402 struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
404 if (!c->mmc || c->mmc > nr_hsmmc)