#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/gpio.h>
-#include <linux/i2c/twl4030.h>
+#include <linux/mmc/host.h>
+#include <linux/regulator/consumer.h>
#include <mach/hardware.h>
#include <mach/control.h>
#include "mmc-twl4030.h"
-#if defined(CONFIG_TWL4030_CORE) && \
- (defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))
-
-#define LDO_CLR 0x00
-#define VSEL_S2_CLR 0x40
-
-#define VMMC1_DEV_GRP 0x27
-#define VMMC1_CLR 0x00
-#define VMMC1_315V 0x03
-#define VMMC1_300V 0x02
-#define VMMC1_285V 0x01
-#define VMMC1_185V 0x00
-#define VMMC1_DEDICATED 0x2A
-#define VMMC2_DEV_GRP 0x2B
-#define VMMC2_CLR 0x40
-#define VMMC2_315V 0x0c
-#define VMMC2_300V 0x0b
-#define VMMC2_285V 0x0a
-#define VMMC2_260V 0x08
-#define VMMC2_185V 0x06
-#define VMMC2_DEDICATED 0x2E
-
-#define VMMC_DEV_GRP_P1 0x20
+#if defined(CONFIG_REGULATOR) && \
+ (defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))
static u16 control_pbias_offset;
static u16 control_devconf1_offset;
static struct twl_mmc_controller {
struct omap_mmc_platform_data *mmc;
- u8 twl_vmmc_dev_grp;
- u8 twl_mmc_dedicated;
- char name[HSMMC_NAME_LEN];
-} hsmmc[] = {
- {
- .twl_vmmc_dev_grp = VMMC1_DEV_GRP,
- .twl_mmc_dedicated = VMMC1_DEDICATED,
- },
- {
- .twl_vmmc_dev_grp = VMMC2_DEV_GRP,
- .twl_mmc_dedicated = VMMC2_DEDICATED,
- },
-};
+ /* Vcc == configured supply
+ * Vcc_alt == optional
+ * - MMC1, supply for DAT4..DAT7
+ * - MMC2/MMC2, external level shifter voltage supply, for
+ * chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
+ */
+ struct regulator *vcc;
+ struct regulator *vcc_aux;
+ char name[HSMMC_NAME_LEN + 1];
+} hsmmc[OMAP34XX_NR_MMC];
static int twl_mmc_card_detect(int irq)
{
return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
}
+static int twl_mmc_get_cover_state(struct device *dev, int slot)
+{
+ struct omap_mmc_platform_data *mmc = dev->platform_data;
+
+ /* NOTE: assumes card detect signal is active-low */
+ return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
+}
+
/*
* MMC Slot Initialization.
*/
int ret = 0;
int i;
- ret = gpio_request(mmc->slots[0].switch_pin, "mmc_cd");
- if (ret)
- goto done;
- ret = gpio_direction_input(mmc->slots[0].switch_pin);
- if (ret)
- goto err;
+ /* MMC/SD/SDIO doesn't require a card detect switch */
+ if (gpio_is_valid(mmc->slots[0].switch_pin)) {
+ ret = gpio_request(mmc->slots[0].switch_pin, "mmc_cd");
+ if (ret)
+ goto done;
+ ret = gpio_direction_input(mmc->slots[0].switch_pin);
+ if (ret)
+ goto err;
+ }
+ /* require at least main regulator */
for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
if (hsmmc[i].name == mmc->slots[0].name) {
+ struct regulator *reg;
+
hsmmc[i].mmc = mmc;
+
+ reg = regulator_get(dev, "vmmc");
+ if (IS_ERR(reg)) {
+ dev_dbg(dev, "vmmc regulator missing\n");
+ /* HACK: until fixed.c regulator is usable,
+ * we don't require a main regulator
+ * for MMC2 or MMC3
+ */
+ if (i != 0)
+ break;
+ ret = PTR_ERR(reg);
+ goto err;
+ }
+ hsmmc[i].vcc = reg;
+ mmc->slots[0].ocr_mask = mmc_regulator_get_ocrmask(reg);
+
+ /* allow an aux regulator */
+ reg = regulator_get(dev, "vmmc_aux");
+ hsmmc[i].vcc_aux = IS_ERR(reg) ? NULL : reg;
+
+ /* UGLY HACK: workaround regulator framework bugs.
+ * When the bootloader leaves a supply active, it's
+ * initialized with zero usecount ... and we can't
+ * disable it without first disabling it. Until the
+ * framework is fixed, we need a workaround like this
+ * (which is safe for MMC, but not in general).
+ */
+ if (regulator_is_enabled(hsmmc[i].vcc) > 0) {
+ dev_warn(dev, "APPLY REGULATOR HACK for vmmc\n");
+ regulator_enable(hsmmc[i].vcc);
+ regulator_disable(hsmmc[i].vcc);
+ }
+ if (hsmmc[i].vcc_aux) {
+ if (regulator_is_enabled(reg) > 0) {
+ dev_warn(dev, "APPLY REGULATOR HACK "
+ "for vmmc_aux\n");
+ regulator_enable(reg);
+ regulator_disable(reg);
+ }
+ }
+
break;
}
}
#define twl_mmc_resume NULL
#endif
-/*
- * Sets the MMC voltage in twl4030
- */
-static int twl_mmc_set_voltage(struct twl_mmc_controller *c, int vdd)
-{
- int ret;
- u8 vmmc, dev_grp_val;
-
- switch (1 << vdd) {
- case MMC_VDD_35_36:
- case MMC_VDD_34_35:
- case MMC_VDD_33_34:
- case MMC_VDD_32_33:
- case MMC_VDD_31_32:
- case MMC_VDD_30_31:
- if (c->twl_vmmc_dev_grp == VMMC1_DEV_GRP)
- vmmc = VMMC1_315V;
- else
- vmmc = VMMC2_315V;
- break;
- case MMC_VDD_29_30:
- if (c->twl_vmmc_dev_grp == VMMC1_DEV_GRP)
- vmmc = VMMC1_315V;
- else
- vmmc = VMMC2_300V;
- break;
- case MMC_VDD_27_28:
- case MMC_VDD_26_27:
- if (c->twl_vmmc_dev_grp == VMMC1_DEV_GRP)
- vmmc = VMMC1_285V;
- else
- vmmc = VMMC2_285V;
- break;
- case MMC_VDD_25_26:
- case MMC_VDD_24_25:
- case MMC_VDD_23_24:
- case MMC_VDD_22_23:
- case MMC_VDD_21_22:
- case MMC_VDD_20_21:
- if (c->twl_vmmc_dev_grp == VMMC1_DEV_GRP)
- vmmc = VMMC1_285V;
- else
- vmmc = VMMC2_260V;
- break;
- case MMC_VDD_165_195:
- if (c->twl_vmmc_dev_grp == VMMC1_DEV_GRP)
- vmmc = VMMC1_185V;
- else
- vmmc = VMMC2_185V;
- break;
- default:
- vmmc = 0;
- break;
- }
-
- if (vmmc)
- dev_grp_val = VMMC_DEV_GRP_P1; /* Power up */
- else
- dev_grp_val = LDO_CLR; /* Power down */
-
- ret = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
- dev_grp_val, c->twl_vmmc_dev_grp);
- if (ret)
- return ret;
-
- ret = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
- vmmc, c->twl_mmc_dedicated);
-
- return ret;
-}
-
static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
int vdd)
{
struct twl_mmc_controller *c = &hsmmc[0];
struct omap_mmc_platform_data *mmc = dev->platform_data;
+ /*
+ * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
+ * card with Vcc regulator (from twl4030 or whatever). OMAP has both
+ * 1.8V and 3.0V modes, controlled by the PBIAS register.
+ *
+ * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
+ * is most naturally TWL VSIM; those pins also use PBIAS.
+ *
+ * FIXME handle VMMC1A as needed ...
+ */
if (power_on) {
if (cpu_is_omap2430()) {
reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
reg &= ~OMAP2_PBIASLITEPWRDNZ0;
omap_ctrl_writel(reg, control_pbias_offset);
- ret = twl_mmc_set_voltage(c, vdd);
+ ret = mmc_regulator_set_ocr(c->vcc, vdd);
/* 100ms delay required for PBIAS configuration */
msleep(100);
reg &= ~OMAP2_PBIASLITEPWRDNZ0;
omap_ctrl_writel(reg, control_pbias_offset);
- ret = twl_mmc_set_voltage(c, 0);
+ ret = mmc_regulator_set_ocr(c->vcc, 0);
/* 100ms delay required for PBIAS configuration */
msleep(100);
return ret;
}
-static int twl_mmc2_set_power(struct device *dev, int slot, int power_on, int vdd)
+static int twl_mmc23_set_power(struct device *dev, int slot, int power_on, int vdd)
{
- int ret;
+ int ret = 0;
struct twl_mmc_controller *c = &hsmmc[1];
struct omap_mmc_platform_data *mmc = dev->platform_data;
+ /* If we don't see a Vcc regulator, assume it's a fixed
+ * voltage always-on regulator.
+ */
+ if (!c->vcc)
+ return 0;
+
+ /*
+ * Assume Vcc regulator is used only to power the card ... OMAP
+ * VDDS is used to power the pins, optionally with a transceiver to
+ * support cards using voltages other than VDDS (1.8V nominal). When a
+ * transceiver is used, DAT3..7 are muxed as transceiver control pins.
+ *
+ * In some cases this regulator won't support enable/disable;
+ * e.g. it's a fixed rail for a WLAN chip.
+ *
+ * In other cases vcc_aux switches interface power. Example, for
+ * eMMC cards it represents VccQ. Sometimes transceivers or SDIO
+ * chips/cards need an interface voltage rail too.
+ */
if (power_on) {
+ /* only MMC2 supports a CLKIN */
if (mmc->slots[0].internal_clock) {
u32 reg;
reg |= OMAP2_MMCSDIO2ADPCLKISEL;
omap_ctrl_writel(reg, control_devconf1_offset);
}
- ret = twl_mmc_set_voltage(c, vdd);
+ ret = mmc_regulator_set_ocr(c->vcc, vdd);
+ /* enable interface voltage rail, if needed */
+ if (ret == 0 && c->vcc_aux) {
+ ret = regulator_enable(c->vcc_aux);
+ if (ret < 0)
+ ret = mmc_regulator_set_ocr(c->vcc, 0);
+ }
} else {
- ret = twl_mmc_set_voltage(c, 0);
+ if (c->vcc_aux && (ret = regulator_is_enabled(c->vcc_aux)) > 0)
+ ret = regulator_disable(c->vcc_aux);
+ if (ret == 0)
+ ret = mmc_regulator_set_ocr(c->vcc, 0);
}
return ret;
return;
}
- sprintf(twl->name, "mmc%islot%i", c->mmc, 1);
+ if (c->name)
+ strncpy(twl->name, c->name, HSMMC_NAME_LEN);
+ else
+ sprintf(twl->name, "mmc%islot%i", c->mmc, 1);
mmc->slots[0].name = twl->name;
mmc->nr_slots = 1;
- mmc->slots[0].ocr_mask = MMC_VDD_165_195 |
- MMC_VDD_26_27 | MMC_VDD_27_28 |
- MMC_VDD_29_30 |
- MMC_VDD_30_31 | MMC_VDD_31_32;
mmc->slots[0].wires = c->wires;
mmc->slots[0].internal_clock = !c->ext_clock;
mmc->dma_mask = 0xffffffff;
+ mmc->init = twl_mmc_late_init;
- /* note: twl4030 card detect GPIOs normally switch VMMCx ... */
+ /* note: twl4030 card detect GPIOs can disable VMMCx ... */
if (gpio_is_valid(c->gpio_cd)) {
- mmc->init = twl_mmc_late_init;
mmc->cleanup = twl_mmc_cleanup;
mmc->suspend = twl_mmc_suspend;
mmc->resume = twl_mmc_resume;
mmc->slots[0].switch_pin = c->gpio_cd;
mmc->slots[0].card_detect_irq = gpio_to_irq(c->gpio_cd);
- mmc->slots[0].card_detect = twl_mmc_card_detect;
+ if (c->cover_only)
+ mmc->slots[0].get_cover_state = twl_mmc_get_cover_state;
+ else
+ mmc->slots[0].card_detect = twl_mmc_card_detect;
} else
mmc->slots[0].switch_pin = -EINVAL;
} else
mmc->slots[0].gpio_wp = -EINVAL;
- /* NOTE: we assume OMAP's MMC1 and MMC2 use
- * the TWL4030's VMMC1 and VMMC2, respectively;
- * and that OMAP's MMC3 isn't used.
+ /* NOTE: MMC slots should have a Vcc regulator set up.
+ * This may be from a TWL4030-family chip, another
+ * controllable regulator, or a fixed supply.
+ *
+ * temporary HACK: ocr_mask instead of fixed supply
*/
+ mmc->slots[0].ocr_mask = c->ocr_mask;
switch (c->mmc) {
case 1:
+ /* on-chip level shifting via PBIAS0/PBIAS1 */
mmc->slots[0].set_power = twl_mmc1_set_power;
break;
case 2:
- mmc->slots[0].set_power = twl_mmc2_set_power;
+ if (c->ext_clock)
+ c->transceiver = 1;
+ if (c->transceiver && c->wires > 4)
+ c->wires = 4;
+ /* FALLTHROUGH */
+ case 3:
+ /* off-chip level shifting, or none */
+ mmc->slots[0].set_power = twl_mmc23_set_power;
break;
default:
pr_err("MMC%d configuration not supported!\n", c->mmc);
+ kfree(mmc);
continue;
}
hsmmc_data[c->mmc - 1] = mmc;
}
omap2_init_mmc(hsmmc_data, OMAP34XX_NR_MMC);
+
+ /* pass the device nodes back to board setup code */
+ for (c = controllers; c->mmc; c++) {
+ struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
+
+ if (!c->mmc || c->mmc > nr_hsmmc)
+ continue;
+ c->dev = mmc->dev;
+ }
}
#endif
projects / linux-2.6-omap-h63xx.git / blobdiff