[PATCH v3] at91/atmel-mci: inclusion of sd/mmc driver in at91sam9g45 chip and board
From: Nicolas Ferre
Date: Fri Oct 22 2010 - 12:22:19 EST
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@xxxxxxxxx>
---
v3: remove the gpio setting to "-1": gpiolib is corectly dealing with "0" value
using gpio_request() function.
arch/arm/mach-at91/at91sam9g45_devices.c | 165 ++++++++++++++++++++++++++++++
arch/arm/mach-at91/board-sam9m10g45ek.c | 24 +++++
drivers/mmc/host/Kconfig | 2 +-
3 files changed, 190 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c
index 1276bab..1e8f275 100644
--- a/arch/arm/mach-at91/at91sam9g45_devices.c
+++ b/arch/arm/mach-at91/at91sam9g45_devices.c
@@ -15,6 +15,7 @@
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/i2c-gpio.h>
+#include <linux/atmel-mci.h>
#include <linux/fb.h>
#include <video/atmel_lcdc.h>
@@ -25,6 +26,7 @@
#include <mach/at91sam9g45_matrix.h>
#include <mach/at91sam9_smc.h>
#include <mach/at_hdmac.h>
+#include <mach/atmel-mci.h>
#include "generic.h"
@@ -350,6 +352,169 @@ 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_AT_HDMAC) || defined(CONFIG_AT_HDMAC_MODULE)
+ {
+ struct at_dma_slave *atslave;
+ struct mci_dma_data *alt_atslave;
+
+ alt_atslave = kzalloc(sizeof(struct mci_dma_data), GFP_KERNEL);
+ atslave = &alt_atslave->sdata;
+
+ /* DMA slave channel configuration */
+ atslave->dma_dev = &at_hdmac_device.dev;
+ atslave->reg_width = AT_DMA_SLAVE_WIDTH_32BIT;
+ atslave->cfg = ATC_FIFOCFG_HALFFIFO
+ | ATC_SRC_H2SEL_HW | ATC_DST_H2SEL_HW;
+ atslave->ctrla = ATC_SCSIZE_16 | ATC_DCSIZE_16;
+ if (mmc_id == 0) /* MCI0 */
+ atslave->cfg |= ATC_SRC_PER(AT_DMA_ID_MCI0)
+ | ATC_DST_PER(AT_DMA_ID_MCI0);
+
+ else /* MCI1 */
+ atslave->cfg |= ATC_SRC_PER(AT_DMA_ID_MCI1)
+ | ATC_DST_PER(AT_DMA_ID_MCI1);
+
+ data->dma_slave = alt_atslave;
+ }
+#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 7913984..86ff4b5 100644
--- a/arch/arm/mach-at91/board-sam9m10g45ek.c
+++ b/arch/arm/mach-at91/board-sam9m10g45ek.c
@@ -24,7 +24,9 @@
#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>
#include <asm/setup.h>
@@ -98,6 +100,25 @@ 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,
+ },
+};
+
+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 = {
@@ -380,6 +401,9 @@ 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 68d1279..1a02611 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -237,7 +237,7 @@ 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
--
1.7.3
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