From: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Correct twl4030 MMC power switching: fix voltage ranges reported
for each slot, and handle them fully.
Lies corrected:
- MMC-1 doesn't support the 2.6-2.7 Volt range
- MMC-2 can't normally support anything except 1.8V
Omissions corrected
- MMC-1 *does* handle the 2.8-2.9 Volt range
- MMC-2 can handle 2.5-3.2 Volt cards, given a transceiver
Add transciever support for MMC-2; enable it for Overo and Pandora.
(Depends on something else to have set up pinmuxing for control
signals instead of as MMC2_DAT4..7 pins.)
Also shrink twl4030_hsmmc_info a smidgeon ... padding is all gone.
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
arch/arm/mach-omap2/board-omap3pandora.c | 1
arch/arm/mach-omap2/board-overo.c | 1
arch/arm/mach-omap2/mmc-twl4030.c | 127 +++++++++++++++++++-----------
arch/arm/mach-omap2/mmc-twl4030.h | 3 -
4 files changed, 84 insertions(+), 48 deletions(-)
diff --git a/arch/arm/mach-omap2/board-omap3pandora.c b/arch/arm/mach-omap2/board-omap3pandora.c
index b319610..7a46a65 100644
--- a/arch/arm/mach-omap2/board-omap3pandora.c
+++ b/arch/arm/mach-omap2/board-omap3pandora.c
@@ -53,6 +53,7 @@ static struct twl4030_hsmmc_info omap3pandora_mmc[] = {
.gpio_cd = -EINVAL,
.gpio_wp = 127,
.ext_clock = 1,
+ .transceiver = true,
},
{} /* Terminator */
};
diff --git a/arch/arm/mach-omap2/board-overo.c b/arch/arm/mach-omap2/board-overo.c
index 82b3dc5..61f8e23 100644
--- a/arch/arm/mach-omap2/board-overo.c
+++ b/arch/arm/mach-omap2/board-overo.c
@@ -209,6 +209,7 @@ static struct twl4030_hsmmc_info mmc[] __initdata = {
.wires = 4,
.gpio_cd = -EINVAL,
.gpio_wp = -EINVAL,
+ .transceiver = true,
},
{} /* Terminator */
};
diff --git a/arch/arm/mach-omap2/mmc-twl4030.c b/arch/arm/mach-omap2/mmc-twl4030.c
index 909f57c..42ac13f 100644
--- a/arch/arm/mach-omap2/mmc-twl4030.c
+++ b/arch/arm/mach-omap2/mmc-twl4030.c
@@ -44,6 +44,7 @@
#define VMMC2_315V 0x0c
#define VMMC2_300V 0x0b
#define VMMC2_285V 0x0a
+#define VMMC2_280V 0x09
#define VMMC2_260V 0x08
#define VMMC2_185V 0x06
#define VMMC2_DEDICATED 0x2E
@@ -166,56 +167,73 @@ static int twl_mmc_resume(struct device *dev, int slot)
/*
* Sets the MMC voltage in twl4030
*/
+
+#define MMC1_OCR (MMC_VDD_165_195 \
+ |MMC_VDD_28_29|MMC_VDD_29_30|MMC_VDD_30_31|MMC_VDD_31_32)
+#define MMC2_OCR (MMC_VDD_165_195 \
+ |MMC_VDD_25_26|MMC_VDD_26_27|MMC_VDD_27_28 \
+ |MMC_VDD_28_29|MMC_VDD_29_30|MMC_VDD_30_31|MMC_VDD_31_32)
+
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)
+ if (c->twl_vmmc_dev_grp == VMMC1_DEV_GRP) {
+ /* VMMC1: max 220 mA. And for 8-bit mode,
+ * VSIM: max 50 mA
+ */
+ switch (1 << vdd) {
+ case MMC_VDD_165_195:
vmmc = VMMC1_185V;
- else
+ /* and VSIM_180V */
+ break;
+ case MMC_VDD_28_29:
+ vmmc = VMMC1_285V;
+ /* and VSIM_280V */
+ break;
+ case MMC_VDD_29_30:
+ case MMC_VDD_30_31:
+ vmmc = VMMC1_300V;
+ /* and VSIM_300V */
+ break;
+ case MMC_VDD_31_32:
+ vmmc = VMMC1_315V;
+ /* error if VSIM needed */
+ break;
+ default:
+ vmmc = 0;
+ break;
+ }
+ } else if (c->twl_vmmc_dev_grp == VMMC2_DEV_GRP) {
+ /* VMMC2: max 100 mA */
+ switch (1 << vdd) {
+ case MMC_VDD_165_195:
vmmc = VMMC2_185V;
- break;
- default:
- vmmc = 0;
- break;
+ break;
+ case MMC_VDD_25_26:
+ case MMC_VDD_26_27:
+ vmmc = VMMC2_260V;
+ break;
+ case MMC_VDD_27_28:
+ vmmc = VMMC2_280V;
+ break;
+ case MMC_VDD_28_29:
+ vmmc = VMMC2_285V;
+ break;
+ case MMC_VDD_29_30:
+ case MMC_VDD_30_31:
+ vmmc = VMMC2_300V;
+ break;
+ case MMC_VDD_31_32:
+ vmmc = VMMC2_315V;
+ break;
+ default:
+ vmmc = 0;
+ break;
+ }
+ } else {
+ return 0;
}
if (vmmc)
@@ -242,6 +260,14 @@ static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
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 using the same TWL VMMC1 supply (hsmmc[0]); 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.
+ */
if (power_on) {
if (cpu_is_omap2430()) {
reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
@@ -298,6 +324,12 @@ static int twl_mmc2_set_power(struct device *dev, int slot, int power_on, int vd
struct twl_mmc_controller *c = &hsmmc[1];
struct omap_mmc_platform_data *mmc = dev->platform_data;
+ /*
+ * Assume TWL VMMC2 (hsmmc[1]) 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.
+ */
if (power_on) {
if (mmc->slots[0].internal_clock) {
u32 reg;
@@ -352,10 +384,6 @@ void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
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;
@@ -391,9 +419,14 @@ void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
switch (c->mmc) {
case 1:
mmc->slots[0].set_power = twl_mmc1_set_power;
+ mmc->slots[0].ocr_mask = MMC1_OCR;
break;
case 2:
mmc->slots[0].set_power = twl_mmc2_set_power;
+ if (c->transceiver)
+ mmc->slots[0].ocr_mask = MMC2_OCR;
+ else
+ mmc->slots[0].ocr_mask = MMC_VDD_165_195;
break;
default:
pr_err("MMC%d configuration not supported!\n", c->mmc);
diff --git a/arch/arm/mach-omap2/mmc-twl4030.h b/arch/arm/mach-omap2/mmc-twl4030.h
index e1c8076..380dde7 100644
--- a/arch/arm/mach-omap2/mmc-twl4030.h
+++ b/arch/arm/mach-omap2/mmc-twl4030.h
@@ -9,9 +9,10 @@
struct twl4030_hsmmc_info {
u8 mmc; /* controller 1/2/3 */
u8 wires; /* 1/4/8 wires */
+ bool transceiver; /* MMC-2 option */
+ bool ext_clock; /* use external pin for input clock */
int gpio_cd; /* or -EINVAL */
int gpio_wp; /* or -EINVAL */
- int ext_clock:1; /* use external pin for input clock */
};
#if defined(CONFIG_TWL4030_CORE) && \
--
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