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Date:	Mon, 26 Oct 2009 09:15:15 +0100
From:	Yegor Yefremov <yegor_sub1@...ionsystems.de>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
CC:	linux-mmc@...r.kernel.org, haavard.skinnemoen@...el.com,
	akpm@...ux-foundation.org, kernel@...32linux.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/3 v2] at91/atmel-mci: inclusion of sd/mmc driver in
 at91sam9g45 chip and board

Nicolas Ferre wrote:
> This adds the support of atmel-mci sd/mmc driver in at91sam9g45 devices and
> board files. This also configures the DMA controller slave interface for
> at_hdmac dmaengine driver.
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> ---
>  arch/arm/mach-at91/at91sam9g45_devices.c |  164 ++++++++++++++++++++++++++++++
>  arch/arm/mach-at91/board-sam9m10g45ek.c  |   24 +++++
>  drivers/mmc/host/Kconfig                 |    2 +-
>  3 files changed, 189 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c
> index d581cff..f341b7e 100644
> --- a/arch/arm/mach-at91/at91sam9g45_devices.c
> +++ b/arch/arm/mach-at91/at91sam9g45_devices.c
> @@ -24,7 +24,10 @@
>  #include <mach/at91sam9g45.h>
>  #include <mach/at91sam9g45_matrix.h>
>  #include <mach/at91sam9_smc.h>
> +
>  #include <mach/at_hdmac.h>
> +#include <mach/atmel-mci.h>
> +#include <linux/atmel-mci.h>
>  
>  #include "generic.h"
>  
> @@ -294,6 +297,167 @@ void __init at91_add_device_eth(struct at91_eth_data *data) {}
>  
>  
>  /* --------------------------------------------------------------------
> + *  MMC / SD
> + * -------------------------------------------------------------------- */
> +
> +#if defined(CONFIG_MMC_ATMELMCI) || defined(CONFIG_MMC_ATMELMCI_MODULE)
> +static u64 mmc_dmamask = DMA_BIT_MASK(32);
> +static struct mci_platform_data mmc0_data, mmc1_data;
> +
> +static struct resource mmc0_resources[] = {
> +	[0] = {
> +		.start	= AT91SAM9G45_BASE_MCI0,
> +		.end	= AT91SAM9G45_BASE_MCI0 + SZ_16K - 1,
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[1] = {
> +		.start	= AT91SAM9G45_ID_MCI0,
> +		.end	= AT91SAM9G45_ID_MCI0,
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct platform_device at91sam9g45_mmc0_device = {
> +	.name		= "atmel_mci",
> +	.id		= 0,
> +	.dev		= {
> +				.dma_mask		= &mmc_dmamask,
> +				.coherent_dma_mask	= DMA_BIT_MASK(32),
> +				.platform_data		= &mmc0_data,
> +	},
> +	.resource	= mmc0_resources,
> +	.num_resources	= ARRAY_SIZE(mmc0_resources),
> +};
> +
> +static struct resource mmc1_resources[] = {
> +	[0] = {
> +		.start	= AT91SAM9G45_BASE_MCI1,
> +		.end	= AT91SAM9G45_BASE_MCI1 + SZ_16K - 1,
> +		.flags	= IORESOURCE_MEM,
> +	},
> +	[1] = {
> +		.start	= AT91SAM9G45_ID_MCI1,
> +		.end	= AT91SAM9G45_ID_MCI1,
> +		.flags	= IORESOURCE_IRQ,
> +	},
> +};
> +
> +static struct platform_device at91sam9g45_mmc1_device = {
> +	.name		= "atmel_mci",
> +	.id		= 1,
> +	.dev		= {
> +				.dma_mask		= &mmc_dmamask,
> +				.coherent_dma_mask	= DMA_BIT_MASK(32),
> +				.platform_data		= &mmc1_data,
> +	},
> +	.resource	= mmc1_resources,
> +	.num_resources	= ARRAY_SIZE(mmc1_resources),
> +};
> +
> +/* Consider only one slot : slot 0 */
> +void __init at91_add_device_mci(short mmc_id, struct mci_platform_data *data)
> +{
> +
> +	if (!data)
> +		return;
> +
> +	/* Must have at least one usable slot */
> +	if (!data->slot[0].bus_width)
> +		return;
> +
> +#if defined(CONFIG_MMC_ATMELMCI_DMA)
> +	{
> +	struct mci_dma_data	*slave;
> +
> +	slave = kzalloc(sizeof(struct mci_dma_data), GFP_KERNEL);
> +
> +	/* DMA slave channel configuration */
> +	slave->sdata.dma_dev = &at_hdmac_device.dev;
> +	slave->sdata.reg_width = DW_DMA_SLAVE_WIDTH_32BIT;

slave->sdata.reg_width = AT_DMA_SLAVE_WIDTH_32BIT;

> +	slave->sdata.cfg = ATC_FIFOCFG_HALFFIFO
> +			 | ATC_SRC_H2SEL_HW | ATC_DST_H2SEL_HW;
> +	slave->sdata.ctrla = ATC_SCSIZE_16 | ATC_DCSIZE_16;
> +	if (mmc_id == 0)	/* MCI0 */
> +		slave->sdata.cfg |= ATC_SRC_PER(AT_DMA_ID_MCI0)
> +				 | ATC_DST_PER(AT_DMA_ID_MCI0);
> +
> +	else			/* MCI1 */
> +		slave->sdata.cfg |= ATC_SRC_PER(AT_DMA_ID_MCI1)
> +				 | ATC_DST_PER(AT_DMA_ID_MCI1);
> +
> +	data->dma_slave = slave;
> +	}
> +#endif
> +
> +
> +	/* input/irq */
> +	if (data->slot[0].detect_pin) {
> +		at91_set_gpio_input(data->slot[0].detect_pin, 1);
> +		at91_set_deglitch(data->slot[0].detect_pin, 1);
> +	}
> +	if (data->slot[0].wp_pin)
> +		at91_set_gpio_input(data->slot[0].wp_pin, 1);
> +
> +	if (mmc_id == 0) {		/* MCI0 */
> +
> +		/* CLK */
> +		at91_set_A_periph(AT91_PIN_PA0, 0);
> +
> +		/* CMD */
> +		at91_set_A_periph(AT91_PIN_PA1, 1);
> +
> +		/* DAT0, maybe DAT1..DAT3 and maybe DAT4..DAT7 */
> +		at91_set_A_periph(AT91_PIN_PA2, 1);
> +		if (data->slot[0].bus_width == 4) {
> +			at91_set_A_periph(AT91_PIN_PA3, 1);
> +			at91_set_A_periph(AT91_PIN_PA4, 1);
> +			at91_set_A_periph(AT91_PIN_PA5, 1);
> +			if (data->slot[0].bus_width == 8) {
> +				at91_set_A_periph(AT91_PIN_PA6, 1);
> +				at91_set_A_periph(AT91_PIN_PA7, 1);
> +				at91_set_A_periph(AT91_PIN_PA8, 1);
> +				at91_set_A_periph(AT91_PIN_PA9, 1);
> +			}
> +		}
> +
> +		mmc0_data = *data;
> +		at91_clock_associate("mci0_clk", &at91sam9g45_mmc0_device.dev, "mci_clk");
> +		platform_device_register(&at91sam9g45_mmc0_device);
> +
> +	} else {			/* MCI1 */
> +
> +		/* CLK */
> +		at91_set_A_periph(AT91_PIN_PA31, 0);
> +
> +		/* CMD */
> +		at91_set_A_periph(AT91_PIN_PA22, 1);
> +
> +		/* DAT0, maybe DAT1..DAT3 and maybe DAT4..DAT7 */
> +		at91_set_A_periph(AT91_PIN_PA23, 1);
> +		if (data->slot[0].bus_width == 4) {
> +			at91_set_A_periph(AT91_PIN_PA24, 1);
> +			at91_set_A_periph(AT91_PIN_PA25, 1);
> +			at91_set_A_periph(AT91_PIN_PA26, 1);
> +			if (data->slot[0].bus_width == 8) {
> +				at91_set_A_periph(AT91_PIN_PA27, 1);
> +				at91_set_A_periph(AT91_PIN_PA28, 1);
> +				at91_set_A_periph(AT91_PIN_PA29, 1);
> +				at91_set_A_periph(AT91_PIN_PA30, 1);
> +			}
> +		}
> +
> +		mmc1_data = *data;
> +		at91_clock_associate("mci1_clk", &at91sam9g45_mmc1_device.dev, "mci_clk");
> +		platform_device_register(&at91sam9g45_mmc1_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-sam9m10g45ek.c b/arch/arm/mach-at91/board-sam9m10g45ek.c
> index 64c3843..1cce010 100644
> --- a/arch/arm/mach-at91/board-sam9m10g45ek.c
> +++ b/arch/arm/mach-at91/board-sam9m10g45ek.c
> @@ -24,6 +24,7 @@
>  #include <linux/input.h>
>  #include <linux/leds.h>
>  #include <linux/clk.h>
> +#include <linux/atmel-mci.h>
>  
>  #include <mach/hardware.h>
>  #include <video/atmel_lcdc.h>
> @@ -99,6 +100,26 @@ static struct spi_board_info ek_spi_devices[] = {
>  
>  
>  /*
> + * MCI (SD/MMC)
> + */
> +static struct mci_platform_data __initdata mci0_data = {
> +	.slot[0] = {
> +		.bus_width	= 4,
> +		.detect_pin	= AT91_PIN_PD10,
> +		.wp_pin		= -1,
> +	},
> +};
> +
> +static struct mci_platform_data __initdata mci1_data = {
> +	.slot[0] = {
> +		.bus_width	= 4,
> +		.detect_pin	= AT91_PIN_PD11,
> +		.wp_pin		= AT91_PIN_PD29,
> +	},
> +};
> +
> +
> +/*
>   * MACB Ethernet device
>   */
>  static struct at91_eth_data __initdata ek_macb_data = {
> @@ -370,6 +391,9 @@ static void __init ek_board_init(void)
>  	at91_add_device_usba(&ek_usba_udc_data);
>  	/* SPI */
>  	at91_add_device_spi(ek_spi_devices, ARRAY_SIZE(ek_spi_devices));
> +	/* MMC */
> +	at91_add_device_mci(0, &mci0_data);
> +	at91_add_device_mci(1, &mci1_data);
>  	/* Ethernet */
>  	at91_add_device_eth(&ek_macb_data);
>  	/* NAND */
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 432ae83..b4aeb9d 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -188,7 +188,7 @@ endchoice
>  
>  config MMC_ATMELMCI_DMA
>  	bool "Atmel MCI DMA support (EXPERIMENTAL)"
> -	depends on MMC_ATMELMCI && AVR32 && DMA_ENGINE && EXPERIMENTAL
> +	depends on MMC_ATMELMCI && (AVR32 || ARCH_AT91SAM9G45) && DMA_ENGINE && EXPERIMENTAL
>  	help
>  	  Say Y here to have the Atmel MCI driver use a DMA engine to
>  	  do data transfers and thus increase the throughput and

Signed-off-by: Yegor Yefremov <yegorslists@...glemail.com>
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