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ARM: OMAP3: mmc-twl4030 voltage cleanup 

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@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
David Brownell 2009-03-23 18:23:47 -07:00 committed by Tony Lindgren
parent 8466032d86
commit 0329c3773e
4 changed files with 84 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/mach-omap2/board-omap3pandora.c
View File

@ -53,6 +53,7 @@ static struct twl4030_hsmmc_info omap3pandora_mmc[] = {
.gpio_cd = -EINVAL,
.gpio_wp = 127,
.ext_clock = 1,
.transceiver = true,
},
{} /* Terminator */
};

1
arch/arm/mach-omap2/board-overo.c
View File

@ -214,6 +214,7 @@ static struct twl4030_hsmmc_info mmc[] __initdata = {
.wires = 4,
.gpio_cd = -EINVAL,
.gpio_wp = -EINVAL,
.transceiver = true,
},
{} /* Terminator */
};

127
arch/arm/mach-omap2/mmc-twl4030.c
View File

@ -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;
@ -353,10 +385,6 @@ void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
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;
@ -392,9 +420,14 @@ 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);

3
arch/arm/mach-omap2/mmc-twl4030.h
View File

@ -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) && \