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Date: Wed, 17 Jun 2009 12:27:39 +0200
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: Rob Emanuele <rob@...nuele.us>,
Andrew Victor <avictor.za@...il.com>
CC: haavard.skinnemoen@...el.com,
linux-arm-kernel@...ts.arm.linux.org.uk,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] atmel-mci: Platform configuration to the the atmel-mci
driver
Rob Emanuele :
> Created a modified version of the at91sam9g20 evaluation kit platform (board-sam9g20ek-2slot-mmc.c) and device support to make use of the updated atmel-mci driver.
>
> This patch shows how an AT91 developer could add support for both SD slots for their project.
Comment formated.
> This requires getting the most updated arch/arm/tools/mach-types from http://www.arm.linux.org.uk/developer/machines/download.php to have the machine type for the modified at91sam9g20ek.
Ok moved below "---"
> Signed-off-by: Rob Emanuele <rob@...nuele.us>
> ---
> arch/arm/mach-at91/Kconfig | 7 +
> arch/arm/mach-at91/Makefile | 1 +
> arch/arm/mach-at91/at91sam9260_devices.c | 95 ++++++++
> arch/arm/mach-at91/board-sam9g20ek-2slot-mmc.c | 277 ++++++++++++++++++++++++
> arch/arm/mach-at91/include/mach/board.h | 5 +
> 5 files changed, 385 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/mach-at91/board-sam9g20ek-2slot-mmc.c
>
> diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
> index 323b47f..5c8d770 100644
> --- a/arch/arm/mach-at91/Kconfig
> +++ b/arch/arm/mach-at91/Kconfig
> @@ -276,6 +276,13 @@ config MACH_AT91SAM9G20EK
> help
> Select this if you are using Atmel's AT91SAM9G20-EK Evaluation Kit.
>
> +config MACH_AT91SAM9G20EK_2MMC
> + bool "Atmel AT91SAM9G20-EK Evaluation Kit modified for 2 MMC Slots"
> + depends on ARCH_AT91SAM9G20
> + help
> + Select this if you are using an Atmel AT91SAM9G20-EK Evaluation Kit
> + Rev A or B modified for 2 MMC Slots.
> +
> endif
>
> # ----------------------------------------------------------
> diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
> index c69ff23..cdddba8 100644
> --- a/arch/arm/mach-at91/Makefile
> +++ b/arch/arm/mach-at91/Makefile
> @@ -54,6 +54,7 @@ obj-$(CONFIG_MACH_AT91SAM9RLEK) += board-sam9rlek.o
>
> # AT91SAM9G20 board-specific support
> obj-$(CONFIG_MACH_AT91SAM9G20EK) += board-sam9g20ek.o
> +obj-$(CONFIG_MACH_AT91SAM9G20EK_2MMC) += board-sam9g20ek-2slot-mmc.o
>
> # AT91CAP9 board-specific support
> obj-$(CONFIG_MACH_AT91CAP9ADK) += board-cap9adk.o
> diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
> index d74c9ac..c372f4f 100644
> --- a/arch/arm/mach-at91/at91sam9260_devices.c
> +++ b/arch/arm/mach-at91/at91sam9260_devices.c
> @@ -278,6 +278,101 @@ void __init at91_add_device_mmc(short mmc_id, struct at91_mmc_data *data)
> void __init at91_add_device_mmc(short mmc_id, struct at91_mmc_data *data) {}
> #endif
>
> +/* --------------------------------------------------------------------
> + * MMC / SD Slot for Atmel MCI Driver
> + * -------------------------------------------------------------------- */
> +
> +#if defined(CONFIG_MMC_ATMELMCI) || defined(CONFIG_MMC_ATMELMCI_MODULE)
> +static u64 mmc_dmamask = DMA_BIT_MASK(32);
> +static struct mci_platform_data mmc_data;
> +
> +static struct resource mmc_resources[] = {
> + [0] = {
> + .start = AT91SAM9260_BASE_MCI,
> + .end = AT91SAM9260_BASE_MCI + SZ_16K - 1,
> + .flags = IORESOURCE_MEM,
> + },
> + [1] = {
> + .start = AT91SAM9260_ID_MCI,
> + .end = AT91SAM9260_ID_MCI,
> + .flags = IORESOURCE_IRQ,
> + },
> +};
> +
> +static struct platform_device at91sam9260_mmc_device = {
> + .name = "atmel_mci",
> + .id = -1,
> + .dev = {
> + .dma_mask = &mmc_dmamask,
> + .coherent_dma_mask = DMA_BIT_MASK(32),
> + .platform_data = &mmc_data,
> + },
> + .resource = mmc_resources,
> + .num_resources = ARRAY_SIZE(mmc_resources),
> +};
> +
> +void __init at91_add_device_mci(short mmc_id, struct mci_platform_data *data)
> +{
> + unsigned int i;
> + unsigned int slot_count = 0;
> +
> + if (!data)
> + return;
> +
> + for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
> + if (data->slot[i].bus_width) {
Indentation.
> + /* input/irq */
> + if (data->slot[i].detect_pin) {
> + at91_set_gpio_input(data->slot[i].detect_pin, 1);
> + at91_set_deglitch(data->slot[i].detect_pin, 1);
> + }
> + if (data->slot[i].wp_pin)
> + at91_set_gpio_input(data->slot[i].wp_pin, 1);
> +
> + switch(i) {
> + case 0:
> + /* CMD */
> + at91_set_A_periph(AT91_PIN_PA7, 1);
> + /* DAT0, maybe DAT1..DAT3 */
> + at91_set_A_periph(AT91_PIN_PA6, 1);
> + if (data->slot[i].bus_width == 4) {
> + at91_set_A_periph(AT91_PIN_PA9, 1);
> + at91_set_A_periph(AT91_PIN_PA10, 1);
> + at91_set_A_periph(AT91_PIN_PA11, 1);
> + }
I put slot_count here...
+ slot_count++;
> + break;
> + case 1:
> + /* CMD */
> + at91_set_B_periph(AT91_PIN_PA1, 1);
> + /* DAT0, maybe DAT1..DAT3 */
> + at91_set_B_periph(AT91_PIN_PA0, 1);
> + if (data->slot[i].bus_width == 4) {
> + at91_set_B_periph(AT91_PIN_PA5, 1);
> + at91_set_B_periph(AT91_PIN_PA4, 1);
> + at91_set_B_periph(AT91_PIN_PA3, 1);
> + }
and here...
+ slot_count++;
> + break;
> + default:
> + printk("Configuration Error, No MMC Port %d\n",i);
Replaced with:
printk(KERN_ERR
"AT91: SD/MMC slot %d not available\n", i);
> + break;
> + };
removed here.
> + slot_count++;
> + }
> + }
> +
> + if (slot_count) {
> + /* CLK */
> + at91_set_A_periph(AT91_PIN_PA8, 0);
> +
> + mmc_data = *data;
> + platform_device_register(&at91sam9260_mmc_device);
> + }
> +}
> +#else
> +void __init at91_add_device_mci(short mmc_id, struct mci_platform_data *data) {}
> +#endif
> +
> +
>
> /* --------------------------------------------------------------------
> * NAND / SmartMedia
> diff --git a/arch/arm/mach-at91/board-sam9g20ek-2slot-mmc.c b/arch/arm/mach-at91/board-sam9g20ek-2slot-mmc.c
> new file mode 100644
> index 0000000..a28e53f
> --- /dev/null
> +++ b/arch/arm/mach-at91/board-sam9g20ek-2slot-mmc.c
Ok. True that it duplicates code but it is simpler.
It also can be a testbed for future -EK revision D and following.
[..]
> diff --git a/arch/arm/mach-at91/include/mach/board.h b/arch/arm/mach-at91/include/mach/board.h
> index e6afff8..a635dad 100644
> --- a/arch/arm/mach-at91/include/mach/board.h
> +++ b/arch/arm/mach-at91/include/mach/board.h
> @@ -37,6 +37,7 @@
> #include <linux/leds.h>
> #include <linux/spi/spi.h>
> #include <linux/usb/atmel_usba_udc.h>
> +#include <linux/atmel-mci.h>
>
> /* USB Device */
> struct at91_udc_data {
> @@ -63,6 +64,7 @@ struct at91_cf_data {
> extern void __init at91_add_device_cf(struct at91_cf_data *data);
>
> /* MMC / SD */
> + /* at91_mci platform config */
> struct at91_mmc_data {
> u8 det_pin; /* card detect IRQ */
> unsigned slot_b:1; /* uses Slot B */
> @@ -72,6 +74,9 @@ struct at91_mmc_data {
> };
> extern void __init at91_add_device_mmc(short mmc_id, struct at91_mmc_data *data);
>
> + /* atmel-mci platform config */
> +extern void __init at91_add_device_mci(short mmc_id, struct mci_platform_data *data);
> +
> /* Ethernet (EMAC & MACB) */
> struct at91_eth_data {
> u32 phy_mask;
Ok.
I post the patch to Andrew Victor with the tiny
modifications above (your SOB & From: preserved of course).
Thanks, Bye,
--
Nicolas Ferre
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