MMC: added alternative MMC driver

Author: weiszg

arch/arm/mach-bcm2708/bcm2708.c

@@ -92,6 +92,7 @@ static unsigned disk_led_active_low = 1;
 static unsigned reboot_part = 0;
 static unsigned w1_gpio_pin = W1_GPIO;
 static unsigned w1_gpio_pullup = W1_PULLUP;
+static unsigned bcm2835_mmc = 0;
 
 static void __init bcm2708_init_led(void);
 
@@ -442,6 +443,34 @@ struct platform_device bcm2708_emmc_device = {
 };
 #endif /* CONFIG_MMC_SDHCI_BCM2708 */
 
+#ifdef CONFIG_MMC_BCM2835	/* Arasan emmc SD (new) */
+static struct resource bcm2835_emmc_resources[] = {
+	[0] = {
+	       .start = EMMC_BASE,
+	       .end = EMMC_BASE + SZ_256 - 1,	/* we only need this area */
+	       /* the memory map actually makes SZ_4K available  */
+	       .flags = IORESOURCE_MEM,
+	       },
+	[1] = {
+	       .start = IRQ_ARASANSDIO,
+	       .end = IRQ_ARASANSDIO,
+	       .flags = IORESOURCE_IRQ,
+	       },
+};
+
+static u64 bcm2835_emmc_dmamask = 0xffffffffUL;
+
+struct platform_device bcm2835_emmc_device = {
+	.name = "mmc-bcm2835",
+	.id = 0,
+	.num_resources = ARRAY_SIZE(bcm2835_emmc_resources),
+	.resource = bcm2835_emmc_resources,
+	.dev = {
+		.dma_mask = &bcm2835_emmc_dmamask,
+		.coherent_dma_mask = 0xffffffffUL},
+};
+#endif /* CONFIG_MMC_BCM2835 */
+
 static struct resource bcm2708_powerman_resources[] = {
 	[0] = {
 	       .start = PM_BASE,
@@ -823,7 +852,12 @@ void __init bcm2708_init(void)
 	bcm_register_device(&bcm2708_powerman_device);
 
 #ifdef CONFIG_MMC_SDHCI_BCM2708
-	bcm_register_device(&bcm2708_emmc_device);
+	if (!bcm2835_mmc)
+		bcm_register_device(&bcm2708_emmc_device);
+#endif
+#ifdef CONFIG_MMC_BCM2835
+	if (bcm2835_mmc)
+		bcm_register_device(&bcm2835_emmc_device);
 #endif
 	bcm2708_init_led();
 	for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
@@ -1053,3 +1087,4 @@ module_param(disk_led_active_low, uint, 0644);
 module_param(reboot_part, uint, 0644);
 module_param(w1_gpio_pin, uint, 0644);
 module_param(w1_gpio_pullup, uint, 0644);
+module_param(bcm2835_mmc, uint, 0644);

drivers/mmc/host/Kconfig

@@ -311,6 +311,35 @@ config MMC_MOXART
 	  be found on some embedded hardware such as UC-7112-LX.
 	  If you have a controller with this interface, say Y here.
 
+config MMC_BCM2835
+	tristate "MMC support on BCM2835"
+	depends on MACH_BCM2708
+	help
+	  This selects the MMC Interface on BCM2835.
+
+	  If you have a controller with this interface, say Y or M here.
+
+	  If unsure, say N.
+
+config MMC_BCM2835_DMA
+	bool "DMA support on BCM2835 Arasan controller"
+	depends on MMC_BCM2835
+	help
+	  Enable DMA support on the Arasan SDHCI controller in Broadcom 2708
+	  based chips.
+
+	  If unsure, say N.
+
+config MMC_BCM2835_PIO_DMA_BARRIER
+	int "Block count limit for PIO transfers"
+	depends on MMC_BCM2835 && MMC_BCM2835_DMA
+	range 0 256
+	default 2
+	help
+	  The inclusive limit in bytes under which PIO will be used instead of DMA
+
+	  If unsure, say 2 here.
+
 config MMC_OMAP
 	tristate "TI OMAP Multimedia Card Interface support"
 	depends on ARCH_OMAP

drivers/mmc/host/Makefile

@@ -17,6 +17,7 @@ obj-$(CONFIG_MMC_SDHCI_S3C)	+= sdhci-s3c.o
 obj-$(CONFIG_MMC_SDHCI_SIRF)   	+= sdhci-sirf.o
 obj-$(CONFIG_MMC_SDHCI_SPEAR)	+= sdhci-spear.o
 obj-$(CONFIG_MMC_SDHCI_BCM2708)	+= sdhci-bcm2708.o
+obj-$(CONFIG_MMC_BCM2835)	+= bcm2835-mmc.o
 obj-$(CONFIG_MMC_WBSD)		+= wbsd.o
 obj-$(CONFIG_MMC_AU1X)		+= au1xmmc.o
 obj-$(CONFIG_MMC_OMAP)		+= omap.o