[PATCH 16/46] davinci: Add MMC/SD support for DA830/OMAP-L137 EVM

[Kevin Hilman]

"H Hartley Sweeten" <hartleys at visionengravers.com> writes:

> On Monday, October 19, 2009 4:52 PM, Kevin Hilman wrote:
>> From 05e5376685ce71812ae8eb48115ce0d7fd8e0776 Mon Sep 17 00:00:00 2001
>> From: David A. Griego <dgriego at mvista.com>
>> Date: Tue, 15 Sep 2009 18:10:20 -0700
>> Subject: [PATCH 16/46] davinci: Add MMC/SD support for DA830/OMAP-L137 EVM
>> 
>> Add pinmux settings, etc. to enable the MMC/SC hardware.
>> 
>> Signed-off-by: David A. Griego <dgriego at mvista.com>
>> Signed-off-by: Mark A. Greer <mgreer at mvista.com>
>> Signed-off-by: Kevin Hilman <khilman at deeprootsystems.com>
>> ---
>>  arch/arm/mach-davinci/board-da830-evm.c |   41 +++++++++++++++++++++++++++++++
>>  1 files changed, 41 insertions(+), 0 deletions(-)
>> 
>> diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
>> index 39711c1..444029e 100644
>> --- a/arch/arm/mach-davinci/board-da830-evm.c
>> +++ b/arch/arm/mach-davinci/board-da830-evm.c
>> @@ -23,6 +23,7 @@
>>  #include <mach/irqs.h>
>>  #include <mach/cp_intc.h>
>>  #include <mach/mux.h>
>> +#include <mach/gpio.h>
>>  #include <mach/da8xx.h>
>>  #include <mach/asp.h>
>>  
>> @@ -83,6 +84,30 @@ static struct snd_platform_data da830_evm_snd_data = {
>>  	.rxnumevt	= 1,
>>  };
>>  
>> +/*
>> + * GPIO2[1] is used as MMC_SD_WP and GPIO2[2] as MMC_SD_INS.
>> + */
>> +static const short da830_evm_mmc_sd_pins[] = {
>> +	DA830_MMCSD_DAT_0, DA830_MMCSD_DAT_1, DA830_MMCSD_DAT_2,
>> +	DA830_MMCSD_DAT_3, DA830_MMCSD_DAT_4, DA830_MMCSD_DAT_5,
>> +	DA830_MMCSD_DAT_6, DA830_MMCSD_DAT_7, DA830_MMCSD_CLK,
>> +	DA830_MMCSD_CMD,   DA830_GPIO2_1,     DA830_GPIO2_2,
>> +	-1
>> +};
>> +
>> +#define DA830_MMCSD_WP_PIN		GPIO_TO_PIN(2, 1)
>> +
>> +static int da830_evm_mmc_get_ro(int index)
>> +{
>> +	return gpio_get_value(DA830_MMCSD_WP_PIN);
>> +}
>> +
>> +static struct davinci_mmc_config da830_evm_mmc_config = {
>> +	.get_ro			= da830_evm_mmc_get_ro,
>> +	.wires			= 4,
>> +	.version		= MMC_CTLR_VERSION_2,
>> +};
>> +
>>  static __init void da830_evm_init(void)
>>  {
>>  	struct davinci_soc_info *soc_info = &davinci_soc_info;
>> @@ -132,6 +157,22 @@ static __init void da830_evm_init(void)
>>  				ret);
>>  
>>  	da8xx_register_mcasp(1, &da830_evm_snd_data);
>> +
>> +	ret = da8xx_pinmux_setup(da830_evm_mmc_sd_pins);
>> +	if (ret)
>> +		pr_warning("da830_evm_init: mmc/sd mux setup failed: %d\n",
>> +				ret);
>> +
>> +	ret = gpio_request(DA830_MMCSD_WP_PIN, "MMC WP");
>> +	if (ret)
>> +		pr_warning("da830_evm_init: can not open GPIO %d\n",
>> +			   DA830_MMCSD_WP_PIN);
>> +	gpio_direction_input(DA830_MMCSD_WP_PIN);
>> +
>> +	ret = da8xx_register_mmcsd0(&da830_evm_mmc_config);
>> +	if (ret)
>> +		pr_warning("da830_evm_init: mmc/sd registration failed: %d\n",
>> +				ret);
>
> If the da8xx_pinmux_setup or gpio_request fail is it still safe to do
> the da8xx_register_mmcsd0?

Well, it would be safe, but it wouldn't work.  ;)

Good catch, I'll break those MMC init calls out into a separate init function
that will return early if any of the calls fails.

Here's an updated version.

Kevin