I am trying to use mmc3 on the Overo Gumstix board with no luck. I
have patched the kernel with the latest changes and have yet to see a
clk pulse, both before and after the patches.
So far I have reconfigured the pins with uboot to GPIO and tested each
pin to verify that the signals are connected properly. That test
passed.
Then I reconfigured them back to MODE 2(mmc modes) for each pin. I am
confident that the level transceiver(TXS0108ERGYR) is operating
properly. This transceiver is automatic so no external controls are
necessary.
<u-boot_snip>
MUX_VAL(CP(ETK_CLK_ES2), (IDIS | PTU | EN | M2)) /*MMC3_CLK*/\
MUX_VAL(CP(ETK_CTL_ES2), (IEN | PTU | EN | M2)) /*MMC3_CMD*/\
MUX_VAL(CP(ETK_D3_ES2), (IEN | PTU | EN | M2)) /*MMC3_DAT3*/\
MUX_VAL(CP(ETK_D4_ES2), (IEN | PTU | EN | M2)) /*MMC3_DAT0*/\
MUX_VAL(CP(ETK_D5_ES2), (IEN | PTU | EN | M2)) /*MMC3_DAT1*/\
MUX_VAL(CP(ETK_D6_ES2), (IEN | PTU | EN | M2)) /*MMC3_DAT2*/\
</u-boot_snip>
<mmc_params>
// I Switched mmc 2 and 3 in a feeble attempt. Also I removed 2 in an
earlier attempt and the kernel would not boot ???????
// Also I have tested working gpio connected to CD and WP but not
attempting to tackle that yet.
static struct twl4030_hsmmc_info mmc[] = {
{
.mmc = 1,
.wires = 4,
.gpio_cd = -EINVAL,
.gpio_wp = -EINVAL,
},
{
.mmc = 3,
.wires = 4,
.gpio_cd = -EINVAL,
.gpio_wp = -EINVAL,
},
{
.mmc = 2,
.wires = 4,
.gpio_cd = -EINVAL,
.gpio_wp = -EINVAL,
.transceiver = true,
.ocr_mask = 0x00100000, /* 3.3V */
},
{} /* Terminator */
};
</mmc_params>
<twl_setup>
static int overo_twl_gpio_setup(struct device *dev,
unsigned gpio, unsigned ngpio)
{
twl4030_mmc_init(mmc); <-- mmc params passed to init
overo_vmmc1_supply.dev = mmc[0].dev;
return 0;
}
static struct twl4030_gpio_platform_data overo_gpio_data = {
.gpio_base = OMAP_MAX_GPIO_LINES,
.irq_base = TWL4030_GPIO_IRQ_BASE,
.irq_end = TWL4030_GPIO_IRQ_END,
.setup = overo_twl_gpio_setup,
<----- setup passed into the twl4030 gpio platform data
};
static struct twl4030_platform_data overo_twldata = {
.irq_base = TWL4030_IRQ_BASE,
.irq_end = TWL4030_IRQ_END,
.gpio = &overo_gpio_data,
<--- gpio data passed into twl4030 plat data
.usb = &overo_usb_data,
.power = GENERIC3430_T2SCRIPTS_DATA,
.vmmc1 = &overo_vmmc1,
};
static struct i2c_board_info __initdata overo_i2c_boardinfo[] = {
{
I2C_BOARD_INFO("tps65950", 0x48),
.flags = I2C_CLIENT_WAKE,
.irq = INT_34XX_SYS_NIRQ,
.platform_data = &overo_twldata,
},
};
static int __init overo_i2c_init(void)
{
omap_register_i2c_bus(1, 2600, overo_i2c_boardinfo,
ARRAY_SIZE(overo_i2c_boardinfo));
/* i2c2 pins are used for gpio */
omap_register_i2c_bus(3, 400, NULL, 0);
return 0;
}
// i2c_init called first in init.
static void __init overo_init(void)
{
overo_i2c_init();
.....
</twl_setup>
So the way I see it working is i2c is initialized, which sets up the
twl4030. When the twl4030 configures gpio it initializes the mmc.
mmc0 comes up fine (I have a root File System), but I never get a clk
on mmc3.
Any help would be greatly appreciated.
Thanks
John Sarman
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