On Wed, Jul 6, 2011 at 4:20 AM, Philip Rakity <prakity@xxxxxxxxxxx> wrote:
> Subject: [PATCH V3] arm: mach-mmp: brownstone.c support multiple sd slots
>
> V3
> ==
> Change since V2 -- delete mmc3 since it was committed
> to linux next.
>
> enable mmc1 used for wifi (8688) and marked PERMANENT.
> Wifi requires enabling of power on the device by
> toggling the gpio lines for power and reset. Enable eMMC first to work
> around problem in booting order due to workqueue bug.
>
> Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
> ---
> arch/arm/mach-mmp/brownstone.c | 41 +++++++++++++++++++++++++++++++++++++++-
> 1 files changed, 40 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-mmp/brownstone.c b/arch/arm/mach-mmp/brownstone.c
> index c79162a..940982c 100644
> --- a/arch/arm/mach-mmp/brownstone.c
> +++ b/arch/arm/mach-mmp/brownstone.c
> @@ -19,6 +19,7 @@
> #include <linux/regulator/max8649.h>
> #include <linux/regulator/fixed.h>
> #include <linux/mfd/max8925.h>
> +#include <linux/delay.h>
>
> #include <asm/mach-types.h>
> #include <asm/mach/arch.h>
> @@ -180,6 +181,11 @@ static struct sdhci_pxa_platdata mmp2_sdh_platdata_mmc0 = {
> .clk_delay_cycles = 0x1f,
> };
>
> +static struct sdhci_pxa_platdata mmp2_sdh_platdata_mmc1 = {
> + .clk_delay_cycles = 0x1f,
> + .flags = PXA_FLAG_CARD_PERMANENT,
> +};
> +
> static struct sdhci_pxa_platdata mmp2_sdh_platdata_mmc2 = {
> .clk_delay_cycles = 0x1f,
> .flags = PXA_FLAG_CARD_PERMANENT
> @@ -187,6 +193,38 @@ static struct sdhci_pxa_platdata mmp2_sdh_platdata_mmc2 = {
> };
>
>
> +static void __init mmc_sdio_wifi(void)
> +{
> + int poweron;
> + int reset;
> +
> + poweron = mfp_to_gpio(GPIO57_GPIO);
> + reset = mfp_to_gpio(GPIO58_GPIO);
> +
> + if (gpio_request(reset, "sd8xxx reset")) {
> + printk(KERN_INFO "gpio %d request failed\n", reset);
> + return;
> + }
> +
> + if (gpio_request(poweron, "sd8xxx PDn")) {
> + gpio_free(reset);
> + printk(KERN_INFO "gpio %d request failed\n", poweron);
> + return;
> + }
> +
> + gpio_direction_output(poweron, 0);
> + msleep(1);
> + gpio_direction_output(poweron, 1);
> + msleep(1);
> + gpio_direction_output(reset, 0);
> + msleep(1);
> + gpio_direction_output(reset, 1);
> + gpio_free(reset);
> + gpio_free(poweron);
> +
> + mmp2_add_sdhost(1, &mmp2_sdh_platdata_mmc1); /* Wifi */
> +}
> +
The method keeps power on wifi chip, without dynamically
enable/disable wifi power, which is not final solution.
How about pushing later with dynamically control power, which is in
debugging here.
> static void __init brownstone_init(void)
> {
> mfp_config(ARRAY_AND_SIZE(brownstone_pin_config));
> @@ -195,8 +233,9 @@ static void __init brownstone_init(void)
> mmp2_add_uart(1);
> mmp2_add_uart(3);
> mmp2_add_twsi(1, NULL, ARRAY_AND_SIZE(brownstone_twsi1_info));
> - mmp2_add_sdhost(0, &mmp2_sdh_platdata_mmc0); /* SD/MMC */
> mmp2_add_sdhost(2, &mmp2_sdh_platdata_mmc2); /* eMMC */
> + mmp2_add_sdhost(0, &mmp2_sdh_platdata_mmc0); /* SD/MMC */
> + mmc_sdio_wifi();
>
> /* enable 5v regulator */
> platform_device_register(&brownstone_v_5vp_device);
> --
> 1.7.0.4
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