Merge branch 'for-rmk' of git://pasiphae.extern.pengutronix.de/git/imx/linux-2.6.git

Merge branch 'imx-devel' into devel

27 files changed, 1270 insertions, 115 deletions

diff --git a/arch/arm/mach-imx/include/mach/irqs.h b/arch/arm/mach-imx/include/mach/irqs.h
index eb8d5bd05d5..67812c5ac1f 100644
--- a/arch/arm/mach-imx/include/mach/irqs.h
+++ b/arch/arm/mach-imx/include/mach/irqs.h
@@ -111,6 +111,11 @@
 /* decode irq number to use with IMR(x), ISR(x) and friends */
 #define IRQ_TO_REG(irq) ((irq - IMX_IRQS) >> 5)
 
+/* all normal IRQs can be FIQs */
+#define FIQ_START	0
+/* switch betwean IRQ and FIQ */
+extern int imx_set_irq_fiq(unsigned int irq, unsigned int type);
+
 #define NR_IRQS (IRQ_GPIOD(32) + 1)
 #define IRQ_GPIO(x)
 #endif
diff --git a/arch/arm/mach-imx/irq.c b/arch/arm/mach-imx/irq.c
index 232e3b9f880..531b95deadc 100644
--- a/arch/arm/mach-imx/irq.c
+++ b/arch/arm/mach-imx/irq.c
@@ -36,10 +36,7 @@
 /*
  *
  * We simply use the ENABLE DISABLE registers inside of the IMX
- * to turn on/off specific interrupts.  FIXME- We should
- * also add support for the accelerated interrupt controller
- * by putting offets to irq jump code in the appropriate
- * places.
+ * to turn on/off specific interrupts.
  *
  */
 
@@ -102,6 +99,28 @@ imx_unmask_irq(unsigned int irq)
 	__raw_writel(irq, IMX_AITC_INTENNUM);
 }
 
+#ifdef CONFIG_FIQ
+int imx_set_irq_fiq(unsigned int irq, unsigned int type)
+{
+	unsigned int irqt;
+
+	if (irq >= IMX_IRQS)
+		return -EINVAL;
+
+	if (irq < IMX_IRQS / 2) {
+		irqt = __raw_readl(IMX_AITC_INTTYPEL) & ~(1 << irq);
+		__raw_writel(irqt | (!!type << irq), IMX_AITC_INTTYPEL);
+	} else {
+		irq -= IMX_IRQS / 2;
+		irqt = __raw_readl(IMX_AITC_INTTYPEH) & ~(1 << irq);
+		__raw_writel(irqt | (!!type << irq), IMX_AITC_INTTYPEH);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_set_irq_fiq);
+#endif /* CONFIG_FIQ */
+
 static int
 imx_gpio_irq_type(unsigned int _irq, unsigned int type)
 {
@@ -284,4 +303,9 @@ imx_init_irq(void)
 
 	/* Release masking of interrupts according to priority */
 	__raw_writel(-1, IMX_AITC_NIMASK);
+
+#ifdef CONFIG_FIQ
+	/* Initialize FIQ */
+	init_FIQ();
+#endif
 }
diff --git a/arch/arm/mach-mx2/devices.h b/arch/arm/mach-mx2/devices.h
new file mode 100644
index 00000000000..c77a4b8f73b
--- /dev/null
+++ b/arch/arm/mach-mx2/devices.h
@@ -0,0 +1,15 @@
+
+extern struct platform_device mxc_gpt1;
+extern struct platform_device mxc_gpt2;
+extern struct platform_device mxc_gpt3;
+extern struct platform_device mxc_gpt4;
+extern struct platform_device mxc_gpt5;
+extern struct platform_device mxc_wdt;
+extern struct platform_device mxc_irda_device;
+extern struct platform_device mxc_uart_device0;
+extern struct platform_device mxc_uart_device1;
+extern struct platform_device mxc_uart_device2;
+extern struct platform_device mxc_uart_device3;
+extern struct platform_device mxc_uart_device4;
+extern struct platform_device mxc_uart_device5;
+
diff --git a/arch/arm/mach-mx2/mx27ads.c b/arch/arm/mach-mx2/mx27ads.c
index 4ce56ef4d8d..56e22d3ca07 100644
--- a/arch/arm/mach-mx2/mx27ads.c
+++ b/arch/arm/mach-mx2/mx27ads.c
@@ -34,6 +34,8 @@
 #include <mach/iomux-mx1-mx2.h>
 #include <mach/board-mx27ads.h>
 
+#include "devices.h"
+
 /* ADS's NOR flash */
 static struct physmap_flash_data mx27ads_flash_data = {
 	.width = 2,
@@ -251,12 +253,14 @@ static struct imxuart_platform_data uart_pdata[] = {
 
 static void __init mx27ads_board_init(void)
 {
-	int i;
-
 	gpio_fec_active();
 
-	for (i = 0; i < 6; i++)
-		imx_init_uart(i, &uart_pdata[i]);
+	mxc_register_device(&mxc_uart_device0, &uart_pdata[0]);
+	mxc_register_device(&mxc_uart_device1, &uart_pdata[1]);
+	mxc_register_device(&mxc_uart_device2, &uart_pdata[2]);
+	mxc_register_device(&mxc_uart_device3, &uart_pdata[3]);
+	mxc_register_device(&mxc_uart_device4, &uart_pdata[4]);
+	mxc_register_device(&mxc_uart_device5, &uart_pdata[5]);
 
 	platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
 }
diff --git a/arch/arm/mach-mx2/pcm038.c b/arch/arm/mach-mx2/pcm038.c
index 1028f453cfc..7f55746e259 100644
--- a/arch/arm/mach-mx2/pcm038.c
+++ b/arch/arm/mach-mx2/pcm038.c
@@ -28,6 +28,8 @@
 #include <mach/imx-uart.h>
 #include <mach/board-pcm038.h>
 
+#include "devices.h"
+
 /*
  * Phytec's phyCORE-i.MX27 comes with 32MiB flash,
  * 16 bit width
@@ -170,11 +172,11 @@ static struct platform_device *platform_devices[] __initdata = {
 
 static void __init pcm038_init(void)
 {
-	int i;
 	gpio_fec_active();
 
-	for (i = 0; i < 3; i++)
-		imx_init_uart(i, &uart_pdata[i]);
+	mxc_register_device(&mxc_uart_device0, &uart_pdata[0]);
+	mxc_register_device(&mxc_uart_device1, &uart_pdata[1]);
+	mxc_register_device(&mxc_uart_device2, &uart_pdata[2]);
 
 	platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
 
diff --git a/arch/arm/mach-mx2/serial.c b/arch/arm/mach-mx2/serial.c
index e31fd44f794..16debc296da 100644
--- a/arch/arm/mach-mx2/serial.c
+++ b/arch/arm/mach-mx2/serial.c
@@ -35,7 +35,7 @@ static struct resource uart0[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device0 = {
+struct platform_device mxc_uart_device0 = {
 	.name = "imx-uart",
 	.id = 0,
 	.resource = uart0,
@@ -54,7 +54,7 @@ static struct resource uart1[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device1 = {
+struct platform_device mxc_uart_device1 = {
 	.name = "imx-uart",
 	.id = 1,
 	.resource = uart1,
@@ -73,7 +73,7 @@ static struct resource uart2[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device2 = {
+struct platform_device mxc_uart_device2 = {
 	.name = "imx-uart",
 	.id = 2,
 	.resource = uart2,
@@ -92,7 +92,7 @@ static struct resource uart3[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device3 = {
+struct platform_device mxc_uart_device3 = {
 	.name = "imx-uart",
 	.id = 3,
 	.resource = uart3,
@@ -111,7 +111,7 @@ static struct resource uart4[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device4 = {
+struct platform_device mxc_uart_device4 = {
 	.name = "imx-uart",
 	.id = 4,
 	.resource = uart4,
@@ -130,48 +130,9 @@ static struct resource uart5[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device5 = {
+struct platform_device mxc_uart_device5 = {
 	.name = "imx-uart",
 	.id = 5,
 	.resource = uart5,
 	.num_resources = ARRAY_SIZE(uart5),
 };
-
-/*
- * Register only those UARTs that physically exists
- */
-int __init imx_init_uart(int uart_no, struct imxuart_platform_data *pdata)
-{
-	switch (uart_no) {
-	case 0:
-		mxc_uart_device0.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device0);
-		break;
-	case 1:
-		mxc_uart_device1.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device1);
-		break;
-#ifndef CONFIG_MXC_IRDA
-	case 2:
-		mxc_uart_device2.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device2);
-		break;
-#endif
-	case 3:
-		mxc_uart_device3.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device3);
-		break;
-	case 4:
-		mxc_uart_device4.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device4);
-		break;
-	case 5:
-		mxc_uart_device5.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device5);
-		break;
-	default:
-		return -ENODEV;
-	}
-
-	return 0;
-}
diff --git a/arch/arm/mach-mx3/devices.c b/arch/arm/mach-mx3/devices.c
index e08c6a8ac56..a6bdcc07f3c 100644
--- a/arch/arm/mach-mx3/devices.c
+++ b/arch/arm/mach-mx3/devices.c
@@ -36,7 +36,7 @@ static struct resource uart0[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device0 = {
+struct platform_device mxc_uart_device0 = {
 	.name = "imx-uart",
 	.id = 0,
 	.resource = uart0,
@@ -55,7 +55,7 @@ static struct resource uart1[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device1 = {
+struct platform_device mxc_uart_device1 = {
 	.name = "imx-uart",
 	.id = 1,
 	.resource = uart1,
@@ -74,7 +74,7 @@ static struct resource uart2[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device2 = {
+struct platform_device mxc_uart_device2 = {
 	.name = "imx-uart",
 	.id = 2,
 	.resource = uart2,
@@ -93,7 +93,7 @@ static struct resource uart3[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device3 = {
+struct platform_device mxc_uart_device3 = {
 	.name = "imx-uart",
 	.id = 3,
 	.resource = uart3,
@@ -112,46 +112,13 @@ static struct resource uart4[] = {
 	},
 };
 
-static struct platform_device mxc_uart_device4 = {
+struct platform_device mxc_uart_device4 = {
 	.name = "imx-uart",
 	.id = 4,
 	.resource = uart4,
 	.num_resources = ARRAY_SIZE(uart4),
 };
 
-/*
- * Register only those UARTs that physically exist
- */
-int __init imx_init_uart(int uart_no, struct imxuart_platform_data *pdata)
-{
-	switch (uart_no) {
-	case 0:
-		mxc_uart_device0.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device0);
-		break;
-	case 1:
-		mxc_uart_device1.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device1);
-		break;
-	case 2:
-		mxc_uart_device2.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device2);
-		break;
-	case 3:
-		mxc_uart_device3.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device3);
-		break;
-	case 4:
-		mxc_uart_device4.dev.platform_data = pdata;
-		platform_device_register(&mxc_uart_device4);
-		break;
-	default:
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 /* GPIO port description */
 static struct mxc_gpio_port imx_gpio_ports[] = {
 	[0] = {
diff --git a/arch/arm/mach-mx3/devices.h b/arch/arm/mach-mx3/devices.h
new file mode 100644
index 00000000000..4dc03f9e600
--- /dev/null
+++ b/arch/arm/mach-mx3/devices.h
@@ -0,0 +1,6 @@
+
+extern struct platform_device mxc_uart_device0;
+extern struct platform_device mxc_uart_device1;
+extern struct platform_device mxc_uart_device2;
+extern struct platform_device mxc_uart_device3;
+extern struct platform_device mxc_uart_device4;
diff --git a/arch/arm/mach-mx3/iomux.c b/arch/arm/mach-mx3/iomux.c
index 3dda1fe23cb..6e664be8cc1 100644
--- a/arch/arm/mach-mx3/iomux.c
+++ b/arch/arm/mach-mx3/iomux.c
@@ -43,7 +43,8 @@ static DEFINE_SPINLOCK(gpio_mux_lock);
  */
 int mxc_iomux_mode(unsigned int pin_mode)
 {
-	u32 reg, field, l, mode, ret = 0;
+	u32 field, l, mode, ret = 0;
+	void __iomem *reg;
 
 	reg = IOMUXSW_MUX_CTL + (pin_mode & IOMUX_REG_MASK);
 	field = pin_mode & 0x3;
@@ -70,7 +71,8 @@ EXPORT_SYMBOL(mxc_iomux_mode);
  */
 void mxc_iomux_set_pad(enum iomux_pins pin, u32 config)
 {
-	u32 reg, field, l;
+	u32 field, l;
+	void __iomem *reg;
 
 	reg = IOMUXSW_PAD_CTL + (pin + 2) / 3;
 	field = (pin + 2) % 3;
diff --git a/arch/arm/mach-mx3/mx31ads.c b/arch/arm/mach-mx3/mx31ads.c
index 0cd90a9667c..1be4a390c63 100644
--- a/arch/arm/mach-mx3/mx31ads.c
+++ b/arch/arm/mach-mx3/mx31ads.c
@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/clk.h>
 #include <linux/serial_8250.h>
+#include <linux/irq.h>
 
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
@@ -31,6 +32,8 @@
 #include <asm/mach/map.h>
 #include <mach/common.h>
 #include <mach/board-mx31ads.h>
+#include <mach/imx-uart.h>
+#include <mach/iomux-mx3.h>
 
 /*!
  * @file mx31ads.c
@@ -84,6 +87,108 @@ static inline int mxc_init_extuart(void)
 }
 #endif
 
+#if defined(CONFIG_SERIAL_IMX) || defined(CONFIG_SERIAL_IMX_MODULE)
+static struct imxuart_platform_data uart_pdata = {
+	.flags = IMXUART_HAVE_RTSCTS,
+};
+
+static inline void mxc_init_imx_uart(void)
+{
+	mxc_iomux_mode(MX31_PIN_CTS1__CTS1);
+	mxc_iomux_mode(MX31_PIN_RTS1__RTS1);
+	mxc_iomux_mode(MX31_PIN_TXD1__TXD1);
+	mxc_iomux_mode(MX31_PIN_RXD1__RXD1);
+
+	mxc_register_device(&mxc_uart_device0, &uart_pdata);
+}
+#else /* !SERIAL_IMX */
+static inline void mxc_init_imx_uart(void)
+{
+}
+#endif /* !SERIAL_IMX */
+
+static void mx31ads_expio_irq_handler(u32 irq, struct irq_desc *desc)
+{
+	u32 imr_val;
+	u32 int_valid;
+	u32 expio_irq;
+
+	imr_val = __raw_readw(PBC_INTMASK_SET_REG);
+	int_valid = __raw_readw(PBC_INTSTATUS_REG) & imr_val;
+
+	expio_irq = MXC_EXP_IO_BASE;
+	for (; int_valid != 0; int_valid >>= 1, expio_irq++) {
+		if ((int_valid & 1) == 0)
+			continue;
+
+		generic_handle_irq(expio_irq);
+	}
+}
+
+/*
+ * Disable an expio pin's interrupt by setting the bit in the imr.
+ * @param irq           an expio virtual irq number
+ */
+static void expio_mask_irq(u32 irq)
+{
+	u32 expio = MXC_IRQ_TO_EXPIO(irq);
+	/* mask the interrupt */
+	__raw_writew(1 << expio, PBC_INTMASK_CLEAR_REG);
+	__raw_readw(PBC_INTMASK_CLEAR_REG);
+}
+
+/*
+ * Acknowledge an expanded io pin's interrupt by clearing the bit in the isr.
+ * @param irq           an expanded io virtual irq number
+ */
+static void expio_ack_irq(u32 irq)
+{
+	u32 expio = MXC_IRQ_TO_EXPIO(irq);
+	/* clear the interrupt status */
+	__raw_writew(1 << expio, PBC_INTSTATUS_REG);
+}
+
+/*
+ * Enable a expio pin's interrupt by clearing the bit in the imr.
+ * @param irq           a expio virtual irq number
+ */
+static void expio_unmask_irq(u32 irq)
+{
+	u32 expio = MXC_IRQ_TO_EXPIO(irq);
+	/* unmask the interrupt */
+	__raw_writew(1 << expio, PBC_INTMASK_SET_REG);
+}
+
+static struct irq_chip expio_irq_chip = {
+	.ack = expio_ack_irq,
+	.mask = expio_mask_irq,
+	.unmask = expio_unmask_irq,
+};
+
+static void __init mx31ads_init_expio(void)
+{
+	int i;
+
+	printk(KERN_INFO "MX31ADS EXPIO(CPLD) hardware\n");
+
+	/*
+	 * Configure INT line as GPIO input
+	 */
+	mxc_iomux_mode(IOMUX_MODE(MX31_PIN_GPIO1_4, IOMUX_CONFIG_GPIO));
+
+	/* disable the interrupt and clear the status */
+	__raw_writew(0xFFFF, PBC_INTMASK_CLEAR_REG);
+	__raw_writew(0xFFFF, PBC_INTSTATUS_REG);
+	for (i = MXC_EXP_IO_BASE; i < (MXC_EXP_IO_BASE + MXC_MAX_EXP_IO_LINES);
+	     i++) {
+		set_irq_chip(i, &expio_irq_chip);
+		set_irq_handler(i, handle_level_irq);
+		set_irq_flags(i, IRQF_VALID);
+	}
+	set_irq_type(EXPIO_PARENT_INT, IRQ_TYPE_LEVEL_HIGH);
+	set_irq_chained_handler(EXPIO_PARENT_INT, mx31ads_expio_irq_handler);
+}
+
 /*!
  * This structure defines static mappings for the i.MX31ADS board.
  */
@@ -120,12 +225,19 @@ void __init mx31ads_map_io(void)
 	iotable_init(mx31ads_io_desc, ARRAY_SIZE(mx31ads_io_desc));
 }
 
+void __init mx31ads_init_irq(void)
+{
+	mxc_init_irq();
+	mx31ads_init_expio();
+}
+
 /*!
  * Board specific initialization.
  */
 static void __init mxc_board_init(void)
 {
 	mxc_init_extuart();
+	mxc_init_imx_uart();
 }
 
 static void __init mx31ads_timer_init(void)
@@ -148,7 +260,7 @@ MACHINE_START(MX31ADS, "Freescale MX31ADS")
 	.io_pg_offst	= ((AIPS1_BASE_ADDR_VIRT) >> 18) & 0xfffc,
 	.boot_params    = PHYS_OFFSET + 0x100,
 	.map_io         = mx31ads_map_io,
-	.init_irq       = mxc_init_irq,
+	.init_irq       = mx31ads_init_irq,
 	.init_machine   = mxc_board_init,
 	.timer          = &mx31ads_timer,
 MACHINE_END
diff --git a/arch/arm/mach-mx3/pcm037.c b/arch/arm/mach-mx3/pcm037.c
index 0a152ed15a8..03374f9e000 100644
--- a/arch/arm/mach-mx3/pcm037.c
+++ b/arch/arm/mach-mx3/pcm037.c
@@ -33,6 +33,8 @@
 #include <mach/iomux-mx3.h>
 #include <mach/board-pcm037.h>
 
+#include "devices.h"
+
 static struct physmap_flash_data pcm037_flash_data = {
 	.width  = 2,
 };
@@ -73,12 +75,12 @@ static void __init mxc_board_init(void)
 	mxc_iomux_mode(MX31_PIN_TXD1__TXD1);
 	mxc_iomux_mode(MX31_PIN_RXD1__RXD1);
 
-	imx_init_uart(0, &uart_pdata);
+	mxc_register_device(&mxc_uart_device0, &uart_pdata);
 
 	mxc_iomux_mode(MX31_PIN_CSPI3_MOSI__RXD3);
 	mxc_iomux_mode(MX31_PIN_CSPI3_MISO__TXD3);
 
-	imx_init_uart(2, &uart_pdata);
+	mxc_register_device(&mxc_uart_device2, &uart_pdata);
 }
 
 /*
diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig
index e14eaad11dd..b2a7e3fad11 100644
--- a/arch/arm/plat-mxc/Kconfig
+++ b/arch/arm/plat-mxc/Kconfig
@@ -23,4 +23,15 @@ source "arch/arm/mach-mx3/Kconfig"
 
 endmenu
 
+config MXC_IRQ_PRIOR
+	bool "Use IRQ priority"
+	depends on ARCH_MXC
+	help
+	  Select this if you want to use prioritized IRQ handling.
+	  This feature prevents higher priority ISR to be interrupted
+	  by lower priority IRQ even IRQF_DISABLED flag is not set.
+	  This may be useful in embedded applications, where are strong
+	  requirements for timing.
+	  Say N here, unless you have a specialized requirement.
+
 endif
diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
index db66e9ae841..067556f7c91 100644
--- a/arch/arm/plat-mxc/Makefile
+++ b/arch/arm/plat-mxc/Makefile
@@ -3,6 +3,6 @@
 #
 
 # Common support
-obj-y := irq.o clock.o gpio.o time.o
+obj-y := irq.o clock.o gpio.o time.o devices.o
 
-obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o
+obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o dma-mx1-mx2.o
diff --git a/arch/arm/plat-mxc/devices.c b/arch/arm/plat-mxc/devices.c
new file mode 100644
index 00000000000..c66748267c4
--- /dev/null
+++ b/arch/arm/plat-mxc/devices.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2008 Sascha Hauer, kernel@pengutronix.de
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+
+int __init mxc_register_device(struct platform_device *pdev, void *data)
+{
+	int ret;
+
+	pdev->dev.platform_data = data;
+
+	ret = platform_device_register(pdev);
+	if (ret)
+		pr_debug("Unable to register platform device '%s': %d\n",
+			 pdev->name, ret);
+
+	return ret;
+}
+
diff --git a/arch/arm/plat-mxc/dma-mx1-mx2.c b/arch/arm/plat-mxc/dma-mx1-mx2.c
new file mode 100644
index 00000000000..b296f19fd89
--- /dev/null
+++ b/arch/arm/plat-mxc/dma-mx1-mx2.c
@@ -0,0 +1,840 @@
+/*
+ *  linux/arch/arm/plat-mxc/dma-mx1-mx2.c
+ *
+ *  i.MX DMA registration and IRQ dispatching
+ *
+ * Copyright 2006 Pavel Pisa <pisa@cmp.felk.cvut.cz>
+ * Copyright 2008 Juergen Beisert, <kernel@pengutronix.de>
+ * Copyright 2008 Sascha Hauer, <s.hauer@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/clk.h>
+#include <linux/scatterlist.h>
+#include <linux/io.h>
+
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <asm/dma.h>
+#include <mach/dma-mx1-mx2.h>
+
+#define DMA_DCR     0x00		/* Control Register */
+#define DMA_DISR    0x04		/* Interrupt status Register */
+#define DMA_DIMR    0x08		/* Interrupt mask Register */
+#define DMA_DBTOSR  0x0c		/* Burst timeout status Register */
+#define DMA_DRTOSR  0x10		/* Request timeout Register */
+#define DMA_DSESR   0x14		/* Transfer Error Status Register */
+#define DMA_DBOSR   0x18		/* Buffer overflow status Register */
+#define DMA_DBTOCR  0x1c		/* Burst timeout control Register */
+#define DMA_WSRA    0x40		/* W-Size Register A */
+#define DMA_XSRA    0x44		/* X-Size Register A */
+#define DMA_YSRA    0x48		/* Y-Size Register A */
+#define DMA_WSRB    0x4c		/* W-Size Register B */
+#define DMA_XSRB    0x50		/* X-Size Register B */
+#define DMA_YSRB    0x54		/* Y-Size Register B */
+#define DMA_SAR(x)  (0x80 + ((x) << 6))	/* Source Address Registers */
+#define DMA_DAR(x)  (0x84 + ((x) << 6))	/* Destination Address Registers */
+#define DMA_CNTR(x) (0x88 + ((x) << 6))	/* Count Registers */
+#define DMA_CCR(x)  (0x8c + ((x) << 6))	/* Control Registers */
+#define DMA_RSSR(x) (0x90 + ((x) << 6))	/* Request source select Registers */
+#define DMA_BLR(x)  (0x94 + ((x) << 6))	/* Burst length Registers */
+#define DMA_RTOR(x) (0x98 + ((x) << 6))	/* Request timeout Registers */
+#define DMA_BUCR(x) (0x98 + ((x) << 6))	/* Bus Utilization Registers */
+#define DMA_CCNR(x) (0x9C + ((x) << 6))	/* Channel counter Registers */
+
+#define DCR_DRST           (1<<1)
+#define DCR_DEN            (1<<0)
+#define DBTOCR_EN          (1<<15)
+#define DBTOCR_CNT(x)      ((x) & 0x7fff)
+#define CNTR_CNT(x)        ((x) & 0xffffff)
+#define CCR_ACRPT          (1<<14)
+#define CCR_DMOD_LINEAR    (0x0 << 12)
+#define CCR_DMOD_2D        (0x1 << 12)
+#define CCR_DMOD_FIFO      (0x2 << 12)
+#define CCR_DMOD_EOBFIFO   (0x3 << 12)
+#define CCR_SMOD_LINEAR    (0x0 << 10)
+#define CCR_SMOD_2D        (0x1 << 10)
+#define CCR_SMOD_FIFO      (0x2 << 10)
+#define CCR_SMOD_EOBFIFO   (0x3 << 10)
+#define CCR_MDIR_DEC       (1<<9)
+#define CCR_MSEL_B         (1<<8)
+#define CCR_DSIZ_32        (0x0 << 6)
+#define CCR_DSIZ_8         (0x1 << 6)
+#define CCR_DSIZ_16        (0x2 << 6)
+#define CCR_SSIZ_32        (0x0 << 4)
+#define CCR_SSIZ_8         (0x1 << 4)
+#define CCR_SSIZ_16        (0x2 << 4)
+#define CCR_REN            (1<<3)
+#define CCR_RPT            (1<<2)
+#define CCR_FRC            (1<<1)
+#define CCR_CEN            (1<<0)
+#define RTOR_EN            (1<<15)
+#define RTOR_CLK           (1<<14)
+#define RTOR_PSC           (1<<13)
+
+/*
+ * struct imx_dma_channel - i.MX specific DMA extension
+ * @name: name specified by DMA client
+ * @irq_handler: client callback for end of transfer
+ * @err_handler: client callback for error condition
+ * @data: clients context data for callbacks
+ * @dma_mode: direction of the transfer %DMA_MODE_READ or %DMA_MODE_WRITE
+ * @sg: pointer to the actual read/written chunk for scatter-gather emulation
+ * @resbytes: total residual number of bytes to transfer
+ *            (it can be lower or same as sum of SG mapped chunk sizes)
+ * @sgcount: number of chunks to be read/written
+ *
+ * Structure is used for IMX DMA processing. It would be probably good
+ * @struct dma_struct in the future for external interfacing and use
+ * @struct imx_dma_channel only as extension to it.
+ */
+
+struct imx_dma_channel {
+	const char *name;
+	void (*irq_handler) (int, void *);
+	void (*err_handler) (int, void *, int errcode);
+	void (*prog_handler) (int, void *, struct scatterlist *);
+	void *data;
+	dmamode_t  dma_mode;
+	struct scatterlist *sg;
+	unsigned int resbytes;
+	int dma_num;
+
+	int in_use;
+
+	u32 ccr_from_device;
+	u32 ccr_to_device;
+
+	struct timer_list watchdog;
+
+	int hw_chaining;
+};
+
+static struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS];
+
+static struct clk *dma_clk;
+
+static int imx_dma_hw_chain(struct imx_dma_channel *imxdma)
+{
+	if (cpu_is_mx27())
+		return imxdma->hw_chaining;
+	else
+		return 0;
+}
+
+
+/*
+ * imx_dma_sg_next - prepare next chunk for scatter-gather DMA emulation
+ */
+static inline int imx_dma_sg_next(int channel, struct scatterlist *sg)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+	unsigned long now;
+
+	if (!imxdma->name) {
+		printk(KERN_CRIT "%s: called for  not allocated channel %d\n",
+		       __func__, channel);
+		return 0;
+	}
+
+	now = min(imxdma->resbytes, sg->length);
+	imxdma->resbytes -= now;
+
+	if ((imxdma->dma_mode & DMA_MODE_MASK) == DMA_MODE_READ)
+		__raw_writel(sg->dma_address, DMA_BASE + DMA_DAR(channel));
+	else
+		__raw_writel(sg->dma_address, DMA_BASE + DMA_SAR(channel));
+
+	__raw_writel(now, DMA_BASE + DMA_CNTR(channel));
+
+	pr_debug("imxdma%d: next sg chunk dst 0x%08x, src 0x%08x, "
+		"size 0x%08x\n", channel,
+		 __raw_readl(DMA_BASE + DMA_DAR(channel)),
+		 __raw_readl(DMA_BASE + DMA_SAR(channel)),
+		 __raw_readl(DMA_BASE + DMA_CNTR(channel)));
+
+	return now;
+}
+
+/**
+ * imx_dma_setup_single - setup i.MX DMA channel for linear memory to/from
+ * device transfer
+ *
+ * @channel: i.MX DMA channel number
+ * @dma_address: the DMA/physical memory address of the linear data block
+ *		to transfer
+ * @dma_length: length of the data block in bytes
+ * @dev_addr: physical device port address
+ * @dmamode: DMA transfer mode, %DMA_MODE_READ from the device to the memory
+ *           or %DMA_MODE_WRITE from memory to the device
+ *
+ * Return value: if incorrect parameters are provided -%EINVAL.
+ *		Zero indicates success.
+ */
+int
+imx_dma_setup_single(int channel, dma_addr_t dma_address,
+		     unsigned int dma_length, unsigned int dev_addr,
+		     dmamode_t dmamode)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+
+	imxdma->sg = NULL;
+	imxdma->dma_mode = dmamode;
+
+	if (!dma_address) {
+		printk(KERN_ERR "imxdma%d: imx_dma_setup_single null address\n",
+		       channel);
+		return -EINVAL;
+	}
+
+	if (!dma_length) {
+		printk(KERN_ERR "imxdma%d: imx_dma_setup_single zero length\n",
+		       channel);
+		return -EINVAL;
+	}
+
+	if ((dmamode & DMA_MODE_MASK) == DMA_MODE_READ) {
+		pr_debug("imxdma%d: %s dma_addressg=0x%08x dma_length=%d "
+			"dev_addr=0x%08x for read\n",
+			channel, __func__, (unsigned int)dma_address,
+			dma_length, dev_addr);
+
+		__raw_writel(dev_addr, DMA_BASE + DMA_SAR(channel));
+		__raw_writel(dma_address, DMA_BASE + DMA_DAR(channel));
+		__raw_writel(imxdma->ccr_from_device,
+				DMA_BASE + DMA_CCR(channel));
+	} else if ((dmamode & DMA_MODE_MASK) == DMA_MODE_WRITE) {
+		pr_debug("imxdma%d: %s dma_addressg=0x%08x dma_length=%d "
+			"dev_addr=0x%08x for write\n",
+			channel, __func__, (unsigned int)dma_address,
+			dma_length, dev_addr);
+
+		__raw_writel(dma_address, DMA_BASE + DMA_SAR(channel));
+		__raw_writel(dev_addr, DMA_BASE + DMA_DAR(channel));
+		__raw_writel(imxdma->ccr_to_device,
+				DMA_BASE + DMA_CCR(channel));
+	} else {
+		printk(KERN_ERR "imxdma%d: imx_dma_setup_single bad dmamode\n",
+		       channel);
+		return -EINVAL;
+	}
+
+	__raw_writel(dma_length, DMA_BASE + DMA_CNTR(channel));
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_dma_setup_single);
+
+/**
+ * imx_dma_setup_sg - setup i.MX DMA channel SG list to/from device transfer
+ * @channel: i.MX DMA channel number
+ * @sg: pointer to the scatter-gather list/vector
+ * @sgcount: scatter-gather list hungs count
+ * @dma_length: total length of the transfer request in bytes
+ * @dev_addr: physical device port address
+ * @dmamode: DMA transfer mode, %DMA_MODE_READ from the device to the memory
+ *           or %DMA_MODE_WRITE from memory to the device
+ *
+ * The function sets up DMA channel state and registers to be ready for
+ * transfer specified by provided parameters. The scatter-gather emulation
+ * is set up according to the parameters.
+ *
+ * The full preparation of the transfer requires setup of more register
+ * by the caller before imx_dma_enable() can be called.
+ *
+ * %BLR(channel) holds transfer burst length in bytes, 0 means 64 bytes
+ *
+ * %RSSR(channel) has to be set to the DMA request line source %DMA_REQ_xxx
+ *
+ * %CCR(channel) has to specify transfer parameters, the next settings is
+ * typical for linear or simple scatter-gather transfers if %DMA_MODE_READ is
+ * specified
+ *
+ * %CCR_DMOD_LINEAR | %CCR_DSIZ_32 | %CCR_SMOD_FIFO | %CCR_SSIZ_x
+ *
+ * The typical setup for %DMA_MODE_WRITE is specified by next options
+ * combination
+ *
+ * %CCR_SMOD_LINEAR | %CCR_SSIZ_32 | %CCR_DMOD_FIFO | %CCR_DSIZ_x
+ *
+ * Be careful here and do not mistakenly mix source and target device
+ * port sizes constants, they are really different:
+ * %CCR_SSIZ_8, %CCR_SSIZ_16, %CCR_SSIZ_32,
+ * %CCR_DSIZ_8, %CCR_DSIZ_16, %CCR_DSIZ_32
+ *
+ * Return value: if incorrect parameters are provided -%EINVAL.
+ * Zero indicates success.
+ */
+int
+imx_dma_setup_sg(int channel,
+		 struct scatterlist *sg, unsigned int sgcount,
+		 unsigned int dma_length, unsigned int dev_addr,
+		 dmamode_t dmamode)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+
+	if (imxdma->in_use)
+		return -EBUSY;
+
+	imxdma->sg = sg;
+	imxdma->dma_mode = dmamode;
+	imxdma->resbytes = dma_length;
+
+	if (!sg || !sgcount) {
+		printk(KERN_ERR "imxdma%d: imx_dma_setup_sg epty sg list\n",
+		       channel);
+		return -EINVAL;
+	}
+
+	if (!sg->length) {
+		printk(KERN_ERR "imxdma%d: imx_dma_setup_sg zero length\n",
+		       channel);
+		return -EINVAL;
+	}
+
+	if ((dmamode & DMA_MODE_MASK) == DMA_MODE_READ) {
+		pr_debug("imxdma%d: %s sg=%p sgcount=%d total length=%d "
+			"dev_addr=0x%08x for read\n",
+			channel, __func__, sg, sgcount, dma_length, dev_addr);
+
+		__raw_writel(dev_addr, DMA_BASE + DMA_SAR(channel));
+		__raw_writel(imxdma->ccr_from_device,
+				DMA_BASE + DMA_CCR(channel));
+	} else if ((dmamode & DMA_MODE_MASK) == DMA_MODE_WRITE) {
+		pr_debug("imxdma%d: %s sg=%p sgcount=%d total length=%d "
+			"dev_addr=0x%08x for write\n",
+			channel, __func__, sg, sgcount, dma_length, dev_addr);
+
+		__raw_writel(dev_addr, DMA_BASE + DMA_DAR(channel));
+		__raw_writel(imxdma->ccr_to_device,
+				DMA_BASE + DMA_CCR(channel));
+	} else {
+		printk(KERN_ERR "imxdma%d: imx_dma_setup_sg bad dmamode\n",
+		       channel);
+		return -EINVAL;
+	}
+
+	imx_dma_sg_next(channel, sg);
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_dma_setup_sg);
+
+int
+imx_dma_config_channel(int channel, unsigned int config_port,
+	unsigned int config_mem, unsigned int dmareq, int hw_chaining)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+	u32 dreq = 0;
+
+	imxdma->hw_chaining = 0;
+
+	if (hw_chaining) {
+		imxdma->hw_chaining = 1;
+		if (!imx_dma_hw_chain(imxdma))
+			return -EINVAL;
+	}
+
+	if (dmareq)
+		dreq = CCR_REN;
+
+	imxdma->ccr_from_device = config_port | (config_mem << 2) | dreq;
+	imxdma->ccr_to_device = config_mem | (config_port << 2) | dreq;
+
+	__raw_writel(dmareq, DMA_BASE + DMA_RSSR(channel));
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_dma_config_channel);
+
+void imx_dma_config_burstlen(int channel, unsigned int burstlen)
+{
+	__raw_writel(burstlen, DMA_BASE + DMA_BLR(channel));
+}
+EXPORT_SYMBOL(imx_dma_config_burstlen);
+
+/**
+ * imx_dma_setup_handlers - setup i.MX DMA channel end and error notification
+ * handlers
+ * @channel: i.MX DMA channel number
+ * @irq_handler: the pointer to the function called if the transfer
+ *		ends successfully
+ * @err_handler: the pointer to the function called if the premature
+ *		end caused by error occurs
+ * @data: user specified value to be passed to the handlers
+ */
+int
+imx_dma_setup_handlers(int channel,
+		       void (*irq_handler) (int, void *),
+		       void (*err_handler) (int, void *, int),
+		       void *data)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+	unsigned long flags;
+
+	if (!imxdma->name) {
+		printk(KERN_CRIT "%s: called for  not allocated channel %d\n",
+		       __func__, channel);
+		return -ENODEV;
+	}
+
+	local_irq_save(flags);
+	__raw_writel(1 << channel, DMA_BASE + DMA_DISR);
+	imxdma->irq_handler = irq_handler;
+	imxdma->err_handler = err_handler;
+	imxdma->data = data;
+	local_irq_restore(flags);
+	return 0;
+}
+EXPORT_SYMBOL(imx_dma_setup_handlers);
+
+/**
+ * imx_dma_setup_progression_handler - setup i.MX DMA channel progression
+ * handlers
+ * @channel: i.MX DMA channel number
+ * @prog_handler: the pointer to the function called if the transfer progresses
+ */
+int
+imx_dma_setup_progression_handler(int channel,
+			void (*prog_handler) (int, void*, struct scatterlist*))
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+	unsigned long flags;
+
+	if (!imxdma->name) {
+		printk(KERN_CRIT "%s: called for  not allocated channel %d\n",
+		       __func__, channel);
+		return -ENODEV;
+	}
+
+	local_irq_save(flags);
+	imxdma->prog_handler = prog_handler;
+	local_irq_restore(flags);
+	return 0;
+}
+EXPORT_SYMBOL(imx_dma_setup_progression_handler);
+
+/**
+ * imx_dma_enable - function to start i.MX DMA channel operation
+ * @channel: i.MX DMA channel number
+ *
+ * The channel has to be allocated by driver through imx_dma_request()
+ * or imx_dma_request_by_prio() function.
+ * The transfer parameters has to be set to the channel registers through
+ * call of the imx_dma_setup_single() or imx_dma_setup_sg() function
+ * and registers %BLR(channel), %RSSR(channel) and %CCR(channel) has to
+ * be set prior this function call by the channel user.
+ */
+void imx_dma_enable(int channel)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+	unsigned long flags;
+
+	pr_debug("imxdma%d: imx_dma_enable\n", channel);
+
+	if (!imxdma->name) {
+		printk(KERN_CRIT "%s: called for  not allocated channel %d\n",
+		       __func__, channel);
+		return;
+	}
+
+	if (imxdma->in_use)
+		return;
+
+	local_irq_save(flags);
+
+	__raw_writel(1 << channel, DMA_BASE + DMA_DISR);
+	__raw_writel(__raw_readl(DMA_BASE + DMA_DIMR) & ~(1 << channel),
+		DMA_BASE + DMA_DIMR);
+	__raw_writel(__raw_readl(DMA_BASE + DMA_CCR(channel)) | CCR_CEN |
+		CCR_ACRPT,
+		DMA_BASE + DMA_CCR(channel));
+
+#ifdef CONFIG_ARCH_MX2
+	if (imxdma->sg && imx_dma_hw_chain(imxdma)) {
+		imxdma->sg = sg_next(imxdma->sg);
+		if (imxdma->sg) {
+			u32 tmp;
+			imx_dma_sg_next(channel, imxdma->sg);
+			tmp = __raw_readl(DMA_BASE + DMA_CCR(channel));
+			__raw_writel(tmp | CCR_RPT | CCR_ACRPT,
+				DMA_BASE + DMA_CCR(channel));
+		}
+	}
+#endif
+	imxdma->in_use = 1;
+
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(imx_dma_enable);
+
+/**
+ * imx_dma_disable - stop, finish i.MX DMA channel operatin
+ * @channel: i.MX DMA channel number
+ */
+void imx_dma_disable(int channel)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+	unsigned long flags;
+
+	pr_debug("imxdma%d: imx_dma_disable\n", channel);
+
+	if (imx_dma_hw_chain(imxdma))
+		del_timer(&imxdma->watchdog);
+
+	local_irq_save(flags);
+	__raw_writel(__raw_readl(DMA_BASE + DMA_DIMR) | (1 << channel),
+		DMA_BASE + DMA_DIMR);
+	__raw_writel(__raw_readl(DMA_BASE + DMA_CCR(channel)) & ~CCR_CEN,
+		DMA_BASE + DMA_CCR(channel));
+	__raw_writel(1 << channel, DMA_BASE + DMA_DISR);
+	imxdma->in_use = 0;
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(imx_dma_disable);
+
+static void imx_dma_watchdog(unsigned long chno)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[chno];
+
+	__raw_writel(0, DMA_BASE + DMA_CCR(chno));
+	imxdma->in_use = 0;
+	imxdma->sg = NULL;
+
+	if (imxdma->err_handler)
+		imxdma->err_handler(chno, imxdma->data, IMX_DMA_ERR_TIMEOUT);
+}
+
+static irqreturn_t dma_err_handler(int irq, void *dev_id)
+{
+	int i, disr;
+	struct imx_dma_channel *imxdma;
+	unsigned int err_mask;
+	int errcode;
+
+	disr = __raw_readl(DMA_BASE + DMA_DISR);
+
+	err_mask = __raw_readl(DMA_BASE + DMA_DBTOSR) |
+		   __raw_readl(DMA_BASE + DMA_DRTOSR) |
+		   __raw_readl(DMA_BASE + DMA_DSESR)  |
+		   __raw_readl(DMA_BASE + DMA_DBOSR);
+
+	if (!err_mask)
+		return IRQ_HANDLED;
+
+	__raw_writel(disr & err_mask, DMA_BASE + DMA_DISR);
+
+	for (i = 0; i < IMX_DMA_CHANNELS; i++) {
+		if (!(err_mask & (1 << i)))
+			continue;
+		imxdma = &imx_dma_channels[i];
+		errcode = 0;
+
+		if (__raw_readl(DMA_BASE + DMA_DBTOSR) & (1 << i)) {
+			__raw_writel(1 << i, DMA_BASE + DMA_DBTOSR);
+			errcode |= IMX_DMA_ERR_BURST;
+		}
+		if (__raw_readl(DMA_BASE + DMA_DRTOSR) & (1 << i)) {
+			__raw_writel(1 << i, DMA_BASE + DMA_DRTOSR);
+			errcode |= IMX_DMA_ERR_REQUEST;
+		}
+		if (__raw_readl(DMA_BASE + DMA_DSESR) & (1 << i)) {
+			__raw_writel(1 << i, DMA_BASE + DMA_DSESR);
+			errcode |= IMX_DMA_ERR_TRANSFER;
+		}
+		if (__raw_readl(DMA_BASE + DMA_DBOSR) & (1 << i)) {
+			__raw_writel(1 << i, DMA_BASE + DMA_DBOSR);
+			errcode |= IMX_DMA_ERR_BUFFER;
+		}
+		if (imxdma->name && imxdma->err_handler) {
+			imxdma->err_handler(i, imxdma->data, errcode);
+			continue;
+		}
+
+		imx_dma_channels[i].sg = NULL;
+
+		printk(KERN_WARNING
+		       "DMA timeout on channel %d (%s) -%s%s%s%s\n",
+		       i, imxdma->name,
+		       errcode & IMX_DMA_ERR_BURST ?    " burst" : "",
+		       errcode & IMX_DMA_ERR_REQUEST ?  " request" : "",
+		       errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
+		       errcode & IMX_DMA_ERR_BUFFER ?   " buffer" : "");
+	}
+	return IRQ_HANDLED;
+}
+
+static void dma_irq_handle_channel(int chno)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[chno];
+
+	if (!imxdma->name) {
+		/*
+		 * IRQ for an unregistered DMA channel:
+		 * let's clear the interrupts and disable it.
+		 */
+		printk(KERN_WARNING
+		       "spurious IRQ for DMA channel %d\n", chno);
+		return;
+	}
+
+	if (imxdma->sg) {
+		u32 tmp;
+		struct scatterlist *current_sg = imxdma->sg;
+		imxdma->sg = sg_next(imxdma->sg);
+
+		if (imxdma->sg) {
+			imx_dma_sg_next(chno, imxdma->sg);
+
+			tmp = __raw_readl(DMA_BASE + DMA_CCR(chno));
+
+			if (imx_dma_hw_chain(imxdma)) {
+				/* FIXME: The timeout should probably be
+				 * configurable
+				 */
+				mod_timer(&imxdma->watchdog,
+					jiffies + msecs_to_jiffies(500));
+
+				tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT;
+				__raw_writel(tmp, DMA_BASE +
+						DMA_CCR(chno));
+			} else {
+				__raw_writel(tmp & ~CCR_CEN, DMA_BASE +
+						DMA_CCR(chno));
+				tmp |= CCR_CEN;
+			}
+
+			__raw_writel(tmp, DMA_BASE + DMA_CCR(chno));
+
+			if (imxdma->prog_handler)
+				imxdma->prog_handler(chno, imxdma->data,
+						current_sg);
+
+			return;
+		}
+
+		if (imx_dma_hw_chain(imxdma)) {
+			del_timer(&imxdma->watchdog);
+			return;
+		}
+	}
+
+	__raw_writel(0, DMA_BASE + DMA_CCR(chno));
+	imxdma->in_use = 0;
+	if (imxdma->irq_handler)
+		imxdma->irq_handler(chno, imxdma->data);
+}
+
+static irqreturn_t dma_irq_handler(int irq, void *dev_id)
+{
+	int i, disr;
+
+#ifdef CONFIG_ARCH_MX2
+	dma_err_handler(irq, dev_id);
+#endif
+
+	disr = __raw_readl(DMA_BASE + DMA_DISR);
+
+	pr_debug("imxdma: dma_irq_handler called, disr=0x%08x\n",
+		     disr);
+
+	__raw_writel(disr, DMA_BASE + DMA_DISR);
+	for (i = 0; i < IMX_DMA_CHANNELS; i++) {
+		if (disr & (1 << i))
+			dma_irq_handle_channel(i);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * imx_dma_request - request/allocate specified channel number
+ * @channel: i.MX DMA channel number
+ * @name: the driver/caller own non-%NULL identification
+ */
+int imx_dma_request(int channel, const char *name)
+{
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+	unsigned long flags;
+	int ret;
+
+	/* basic sanity checks */
+	if (!name)
+		return -EINVAL;
+
+	if (channel >= IMX_DMA_CHANNELS) {
+		printk(KERN_CRIT "%s: called for  non-existed channel %d\n",
+		       __func__, channel);
+		return -EINVAL;
+	}
+
+	local_irq_save(flags);
+	if (imxdma->name) {
+		local_irq_restore(flags);
+		return -EBUSY;
+	}
+
+#ifdef CONFIG_ARCH_MX2
+	ret = request_irq(MXC_INT_DMACH0 + channel, dma_irq_handler, 0, "DMA",
+			NULL);
+	if (ret) {
+		printk(KERN_CRIT "Can't register IRQ %d for DMA channel %d\n",
+				MXC_INT_DMACH0 + channel, channel);
+		return ret;
+	}
+	init_timer(&imxdma->watchdog);
+	imxdma->watchdog.function = &imx_dma_watchdog;
+	imxdma->watchdog.data = channel;
+#endif
+
+	imxdma->name = name;
+	imxdma->irq_handler = NULL;
+	imxdma->err_handler = NULL;
+	imxdma->data = NULL;
+	imxdma->sg = NULL;
+
+	local_irq_restore(flags);
+	return 0;
+}
+EXPORT_SYMBOL(imx_dma_request);
+
+/**
+ * imx_dma_free - release previously acquired channel
+ * @channel: i.MX DMA channel number
+ */
+void imx_dma_free(int channel)
+{
+	unsigned long flags;
+	struct imx_dma_channel *imxdma = &imx_dma_channels[channel];
+
+	if (!imxdma->name) {
+		printk(KERN_CRIT
+		       "%s: trying to free free channel %d\n",
+		       __func__, channel);
+		return;
+	}
+
+	local_irq_save(flags);
+	/* Disable interrupts */
+	__raw_writel(__raw_readl(DMA_BASE + DMA_DIMR) | (1 << channel),
+		DMA_BASE + DMA_DIMR);
+	__raw_writel(__raw_readl(DMA_BASE + DMA_CCR(channel)) & ~CCR_CEN,
+		DMA_BASE + DMA_CCR(channel));
+	imxdma->name = NULL;
+
+#ifdef CONFIG_ARCH_MX2
+	free_irq(MXC_INT_DMACH0 + channel, NULL);
+#endif
+
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(imx_dma_free);
+
+/**
+ * imx_dma_request_by_prio - find and request some of free channels best
+ * suiting requested priority
+ * @channel: i.MX DMA channel number
+ * @name: the driver/caller own non-%NULL identification
+ *
+ * This function tries to find a free channel in the specified priority group
+ * This function tries to find a free channel in the specified priority group
+ * if the priority cannot be achieved it tries to look for free channel
+ * in the higher and then even lower priority groups.
+ *
+ * Return value: If there is no free channel to allocate, -%ENODEV is returned.
+ *               On successful allocation channel is returned.
+ */
+int imx_dma_request_by_prio(const char *name, enum imx_dma_prio prio)
+{
+	int i;
+	int best;
+
+	switch (prio) {
+	case (DMA_PRIO_HIGH):
+		best = 8;
+		break;
+	case (DMA_PRIO_MEDIUM):
+		best = 4;
+		break;
+	case (DMA_PRIO_LOW):
+	default:
+		best = 0;
+		break;
+	}
+
+	for (i = best; i < IMX_DMA_CHANNELS; i++)
+		if (!imx_dma_request(i, name))
+			return i;
+
+	for (i = best - 1; i >= 0; i--)
+		if (!imx_dma_request(i, name))
+			return i;
+
+	printk(KERN_ERR "%s: no free DMA channel found\n", __func__);
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL(imx_dma_request_by_prio);
+
+static int __init imx_dma_init(void)
+{
+	int ret = 0;
+	int i;
+
+	dma_clk = clk_get(NULL, "dma_clk");
+	clk_enable(dma_clk);
+
+	/* reset DMA module */
+	__raw_writel(DCR_DRST, DMA_BASE + DMA_DCR);
+
+#ifdef CONFIG_ARCH_MX1
+	ret = request_irq(DMA_INT, dma_irq_handler, 0, "DMA", NULL);
+	if (ret) {
+		printk(KERN_CRIT "Wow!  Can't register IRQ for DMA\n");
+		return ret;
+	}
+
+	ret = request_irq(DMA_ERR, dma_err_handler, 0, "DMA", NULL);
+	if (ret) {
+		printk(KERN_CRIT "Wow!  Can't register ERRIRQ for DMA\n");
+		free_irq(DMA_INT, NULL);
+		return ret;
+	}
+#endif
+	/* enable DMA module */
+	__raw_writel(DCR_DEN, DMA_BASE + DMA_DCR);
+
+	/* clear all interrupts */
+	__raw_writel((1 << IMX_DMA_CHANNELS) - 1, DMA_BASE + DMA_DISR);
+
+	/* disable interrupts */
+	__raw_writel((1 << IMX_DMA_CHANNELS) - 1, DMA_BASE + DMA_DIMR);
+
+	for (i = 0; i < IMX_DMA_CHANNELS; i++) {
+		imx_dma_channels[i].sg = NULL;
+		imx_dma_channels[i].dma_num = i;
+	}
+
+	return ret;
+}
+
+arch_initcall(imx_dma_init);
diff --git a/arch/arm/plat-mxc/include/mach/board-mx31ads.h b/arch/arm/plat-mxc/include/mach/board-mx31ads.h
index 1bc6fb0f9a8..745b48864f9 100644
--- a/arch/arm/plat-mxc/include/mach/board-mx31ads.h
+++ b/arch/arm/plat-mxc/include/mach/board-mx31ads.h
@@ -90,6 +90,9 @@
 #define PBC_INTMASK_CLEAR_REG	(PBC_INTMASK_CLEAR + PBC_BASE_ADDRESS)
 #define EXPIO_PARENT_INT	IOMUX_TO_IRQ(MX31_PIN_GPIO1_4)
 
+#define MXC_EXP_IO_BASE		(MXC_MAX_INT_LINES + MXC_MAX_GPIO_LINES)
+#define MXC_IRQ_TO_EXPIO(irq)	((irq) - MXC_EXP_IO_BASE)
+
 #define EXPIO_INT_LOW_BAT	(MXC_EXP_IO_BASE + 0)
 #define EXPIO_INT_PB_IRQ	(MXC_EXP_IO_BASE + 1)
 #define EXPIO_INT_OTG_FS_OVR	(MXC_EXP_IO_BASE + 2)
diff --git a/arch/arm/plat-mxc/include/mach/clock.h b/arch/arm/plat-mxc/include/mach/clock.h
index 24caa2b7c91..d21f78e7881 100644
--- a/arch/arm/plat-mxc/include/mach/clock.h
+++ b/arch/arm/plat-mxc/include/mach/clock.h
@@ -39,7 +39,7 @@ struct clk {
 	/* Register bit position for clock's enable/disable control. */
 	u8 enable_shift;
 	/* Register address for clock's enable/disable control. */
-	u32 enable_reg;
+	void __iomem *enable_reg;
 	u32 flags;
 	/* get the current clock rate (always a fresh value) */
 	unsigned long (*get_rate) (struct clk *);
diff --git a/arch/arm/plat-mxc/include/mach/common.h b/arch/arm/plat-mxc/include/mach/common.h
index a6d2e24aab1..6350287a59b 100644
--- a/arch/arm/plat-mxc/include/mach/common.h
+++ b/arch/arm/plat-mxc/include/mach/common.h
@@ -11,10 +11,13 @@
 #ifndef __ASM_ARCH_MXC_COMMON_H__
 #define __ASM_ARCH_MXC_COMMON_H__
 
+struct platform_device;
+
 extern void mxc_map_io(void);
 extern void mxc_init_irq(void);
 extern void mxc_timer_init(const char *clk_timer);
 extern int mxc_clocks_init(unsigned long fref);
 extern int mxc_register_gpios(void);
+extern int mxc_register_device(struct platform_device *pdev, void *data);
 
 #endif
diff --git a/arch/arm/plat-mxc/include/mach/dma-mx1-mx2.h b/arch/arm/plat-mxc/include/mach/dma-mx1-mx2.h
new file mode 100644
index 00000000000..e85fd946116
--- /dev/null
+++ b/arch/arm/plat-mxc/include/mach/dma-mx1-mx2.h
@@ -0,0 +1,89 @@
+/*
+ *  linux/arch/arm/plat-mxc/include/mach/dma-mx1-mx2.h
+ *
+ *  i.MX DMA registration and IRQ dispatching
+ *
+ * Copyright 2006 Pavel Pisa <pisa@cmp.felk.cvut.cz>
+ * Copyright 2008 Juergen Beisert, <kernel@pengutronix.de>
+ * Copyright 2008 Sascha Hauer, <s.hauer@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <asm/dma.h>
+
+#ifndef __ASM_ARCH_MXC_DMA_H
+#define __ASM_ARCH_MXC_DMA_H
+
+#define IMX_DMA_CHANNELS  16
+
+#define DMA_BASE IO_ADDRESS(DMA_BASE_ADDR)
+
+#define IMX_DMA_MEMSIZE_32	(0 << 4)
+#define IMX_DMA_MEMSIZE_8	(1 << 4)
+#define IMX_DMA_MEMSIZE_16	(2 << 4)
+#define IMX_DMA_TYPE_LINEAR	(0 << 10)
+#define IMX_DMA_TYPE_2D		(1 << 10)
+#define IMX_DMA_TYPE_FIFO	(2 << 10)
+
+#define IMX_DMA_ERR_BURST     (1 << 0)
+#define IMX_DMA_ERR_REQUEST   (1 << 1)
+#define IMX_DMA_ERR_TRANSFER  (1 << 2)
+#define IMX_DMA_ERR_BUFFER    (1 << 3)
+#define IMX_DMA_ERR_TIMEOUT   (1 << 4)
+
+int
+imx_dma_config_channel(int channel, unsigned int config_port,
+	unsigned int config_mem, unsigned int dmareq, int hw_chaining);
+
+void
+imx_dma_config_burstlen(int channel, unsigned int burstlen);
+
+int
+imx_dma_setup_single(int channel, dma_addr_t dma_address,
+		unsigned int dma_length, unsigned int dev_addr,
+		dmamode_t dmamode);
+
+int
+imx_dma_setup_sg(int channel, struct scatterlist *sg,
+		unsigned int sgcount, unsigned int dma_length,
+		unsigned int dev_addr, dmamode_t dmamode);
+
+int
+imx_dma_setup_handlers(int channel,
+		void (*irq_handler) (int, void *),
+		void (*err_handler) (int, void *, int), void *data);
+
+int
+imx_dma_setup_progression_handler(int channel,
+		void (*prog_handler) (int, void*, struct scatterlist*));
+
+void imx_dma_enable(int channel);
+
+void imx_dma_disable(int channel);
+
+int imx_dma_request(int channel, const char *name);
+
+void imx_dma_free(int channel);
+
+enum imx_dma_prio {
+	DMA_PRIO_HIGH = 0,
+	DMA_PRIO_MEDIUM = 1,
+	DMA_PRIO_LOW = 2
+};
+
+int imx_dma_request_by_prio(const char *name, enum imx_dma_prio prio);
+
+#endif	/* _ASM_ARCH_MXC_DMA_H */
diff --git a/arch/arm/plat-mxc/include/mach/entry-macro.S b/arch/arm/plat-mxc/include/mach/entry-macro.S
index b542433afb1..11632028f7d 100644
--- a/arch/arm/plat-mxc/include/mach/entry-macro.S
+++ b/arch/arm/plat-mxc/include/mach/entry-macro.S
@@ -9,11 +9,17 @@
  * published by the Free Software Foundation.
  */
 
+#define AVIC_NIMASK	0x04
+
 	@ this macro disables fast irq (not implemented)
 	.macro	disable_fiq
 	.endm
 
 	.macro  get_irqnr_preamble, base, tmp
+	ldr	\base, =AVIC_IO_ADDRESS(AVIC_BASE_ADDR)
+#ifdef CONFIG_MXC_IRQ_PRIOR
+	ldr	r4, [\base, #AVIC_NIMASK]
+#endif
 	.endm
 
 	.macro  arch_ret_to_user, tmp1, tmp2
@@ -23,7 +29,6 @@
 	@ and returns its number in irqnr
 	@ and returns if an interrupt occured in irqstat
 	.macro	get_irqnr_and_base, irqnr, irqstat, base, tmp
-	ldr	\base, =AVIC_IO_ADDRESS(AVIC_BASE_ADDR)
 	@ Load offset & priority of the highest priority
 	@ interrupt pending from AVIC_NIVECSR
 	ldr	\irqstat, [\base, #0x40]
@@ -32,6 +37,11 @@
 	mov	\irqnr, \irqstat, asr #16
 	@ set zero flag if IRQ + 1 == 0
 	adds	\tmp, \irqnr, #1
+#ifdef CONFIG_MXC_IRQ_PRIOR
+	bicne	\tmp, \irqstat, #0xFFFFFFE0
+	strne	\tmp, [\base, #AVIC_NIMASK]
+	streq	r4, [\base, #AVIC_NIMASK]
+#endif
 	.endm
 
 	@ irq priority table (not used)
diff --git a/arch/arm/plat-mxc/include/mach/iomux-mx1-mx2.h b/arch/arm/plat-mxc/include/mach/iomux-mx1-mx2.h
index 076d37b38eb..3d09bfd6c53 100644
--- a/arch/arm/plat-mxc/include/mach/iomux-mx1-mx2.h
+++ b/arch/arm/plat-mxc/include/mach/iomux-mx1-mx2.h
@@ -247,6 +247,11 @@ extern int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 #endif
 
 #ifdef CONFIG_ARCH_MX2
+#define PA0_PF_USBH2_CLK	(GPIO_PORTA | GPIO_PF | 0)
+#define PA1_PF_USBH2_DIR	(GPIO_PORTA | GPIO_PF | 1)
+#define PA2_PF_USBH2_DATA7	(GPIO_PORTA | GPIO_PF | 2)
+#define PA3_PF_USBH2_NXT	(GPIO_PORTA | GPIO_PF | 3)
+#define PA4_PF_USBH2_STP	(GPIO_PORTA | GPIO_PF | 4)
 #define PA5_PF_LSCLK		(GPIO_PORTA | GPIO_OUT | GPIO_PF | 5)
 #define PA6_PF_LD0		(GPIO_PORTA | GPIO_OUT | GPIO_PF | 6)
 #define PA7_PF_LD1		(GPIO_PORTA | GPIO_OUT | GPIO_PF | 7)
@@ -294,6 +299,16 @@ extern int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 #define PB20_AF_UART5_CTS	(GPIO_PORTB | GPIO_OUT | GPIO_AF | 20)
 #define PB21_PF_CSI_HSYNC	(GPIO_PORTB | GPIO_OUT | GPIO_PF | 21)
 #define PB21_AF_UART5_RTS	(GPIO_PORTB | GPIO_IN  | GPIO_AF | 21)
+#define PB22_PF_USBH1_SUSP	(GPIO_PORTB | GPIO_PF | 22)
+#define PB23_PF_USB_PWR		(GPIO_PORTB | GPIO_PF | 23)
+#define PB24_PF_USB_OC_B	(GPIO_PORTB | GPIO_PF | 24)
+#define PB25_PF_USBH1_RCV	(GPIO_PORTB | GPIO_PF | 25)
+#define PB26_PF_USBH1_FS	(GPIO_PORTB | GPIO_PF | 26)
+#define PB27_PF_USBH1_OE_B	(GPIO_PORTB | GPIO_PF | 27)
+#define PB28_PF_USBH1_TXDM	(GPIO_PORTB | GPIO_PF | 28)
+#define PB29_PF_USBH1_TXDP	(GPIO_PORTB | GPIO_PF | 29)
+#define PB30_PF_USBH1_RXDM	(GPIO_PORTB | GPIO_PF | 30)
+#define PB31_PF_USBH1_RXDP	(GPIO_PORTB | GPIO_PF | 31)
 #define PB26_AF_UART4_RTS	(GPIO_PORTB | GPIO_IN  | GPIO_PF | 26)
 #define PB28_AF_UART4_TXD	(GPIO_PORTB | GPIO_OUT | GPIO_AF | 28)
 #define PB29_AF_UART4_CTS	(GPIO_PORTB | GPIO_OUT | GPIO_AF | 29)
@@ -335,8 +350,15 @@ extern int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 #define PD16_AIN_FEC_TX_ER	(GPIO_PORTD | GPIO_OUT | GPIO_AIN | 16)
 #define PD17_PF_I2C_DATA	(GPIO_PORTD | GPIO_OUT | GPIO_PF | 17)
 #define PD18_PF_I2C_CLK		(GPIO_PORTD | GPIO_OUT | GPIO_PF | 18)
+#define PD19_AF_USBH2_DATA4	(GPIO_PORTD | GPIO_AF | 19)
+#define PD20_AF_USBH2_DATA3	(GPIO_PORTD | GPIO_AF | 20)
+#define PD21_AF_USBH2_DATA6	(GPIO_PORTD | GPIO_AF | 21)
+#define PD22_AF_USBH2_DATA0	(GPIO_PORTD | GPIO_AF | 22)
+#define PD23_AF_USBH2_DATA2	(GPIO_PORTD | GPIO_AF | 23)
+#define PD24_AF_USBH2_DATA1	(GPIO_PORTD | GPIO_AF | 24)
 #define PD25_PF_CSPI1_RDY	(GPIO_PORTD | GPIO_OUT | GPIO_PF  | 25)
 #define PD26_PF_CSPI1_SS2	(GPIO_PORTD | GPIO_OUT | GPIO_PF  | 26)
+#define PD26_AF_USBH2_DATA5     (GPIO_PORTD | GPIO_AF | 26)
 #define PD27_PF_CSPI1_SS1	(GPIO_PORTD | GPIO_OUT | GPIO_PF  | 27)
 #define PD28_PF_CSPI1_SS0	(GPIO_PORTD | GPIO_OUT | GPIO_PF  | 28)
 #define PD29_PF_CSPI1_SCLK	(GPIO_PORTD | GPIO_OUT | GPIO_PF  | 29)
@@ -355,6 +377,8 @@ extern int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 #define PE13_PF_UART1_RXD	(GPIO_PORTE | GPIO_IN  | GPIO_PF | 13)
 #define PE14_PF_UART1_CTS	(GPIO_PORTE | GPIO_OUT | GPIO_PF | 14)
 #define PE15_PF_UART1_RTS	(GPIO_PORTE | GPIO_IN  | GPIO_PF | 15)
+#define PE16_AF_RTCK		(GPIO_PORTE | GPIO_OUT | GPIO_AF | 16)
+#define PE16_PF_RTCK		(GPIO_PORTE | GPIO_OUT | GPIO_PF | 16)
 #define PE18_AF_CSPI3_MISO	(GPIO_PORTE | GPIO_IN  | GPIO_AF | 18)
 #define PE21_AF_CSPI3_SS	(GPIO_PORTE | GPIO_OUT | GPIO_AF | 21)
 #define PE22_AF_CSPI3_MOSI	(GPIO_PORTE | GPIO_OUT | GPIO_AF | 22)
diff --git a/arch/arm/plat-mxc/include/mach/iomux-mx3.h b/arch/arm/plat-mxc/include/mach/iomux-mx3.h
index 7509e7692f0..c9f39c2fb8c 100644
--- a/arch/arm/plat-mxc/include/mach/iomux-mx3.h
+++ b/arch/arm/plat-mxc/include/mach/iomux-mx3.h
@@ -491,6 +491,26 @@ enum iomux_pins {
 #define MX31_PIN_RTS1__RTS1		IOMUX_MODE(MX31_PIN_RTS1, IOMUX_CONFIG_FUNC)
 #define MX31_PIN_TXD1__TXD1		IOMUX_MODE(MX31_PIN_TXD1, IOMUX_CONFIG_FUNC)
 #define MX31_PIN_RXD1__RXD1		IOMUX_MODE(MX31_PIN_RXD1, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI1_MOSI__MOSI	IOMUX_MODE(MX31_PIN_CSPI1_MOSI, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI1_MISO__MISO	IOMUX_MODE(MX31_PIN_CSPI1_MISO, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI1_SCLK__SCLK	IOMUX_MODE(MX31_PIN_CSPI1_SCLK, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI1_SPI_RDY__SPI_RDY	IOMUX_MODE(MX31_PIN_CSPI1_SPI_RDY, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI1_SS0__SS0		IOMUX_MODE(MX31_PIN_CSPI1_SS0, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI1_SS1__SS1		IOMUX_MODE(MX31_PIN_CSPI1_SS1, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI1_SS2__SS2		IOMUX_MODE(MX31_PIN_CSPI1_SS2, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI2_MOSI__MOSI	IOMUX_MODE(MX31_PIN_CSPI2_MOSI, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI2_MISO__MISO	IOMUX_MODE(MX31_PIN_CSPI2_MISO, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI2_SCLK__SCLK	IOMUX_MODE(MX31_PIN_CSPI2_SCLK, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI2_SPI_RDY__SPI_RDY	IOMUX_MODE(MX31_PIN_CSPI2_SPI_RDY, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI2_SS0__SS0		IOMUX_MODE(MX31_PIN_CSPI2_SS0, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI2_SS1__SS1		IOMUX_MODE(MX31_PIN_CSPI2_SS1, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI2_SS2__SS2		IOMUX_MODE(MX31_PIN_CSPI2_SS2, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI3_MOSI__MOSI	IOMUX_MODE(MX31_PIN_CSPI3_MOSI, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI3_MISO__MISO	IOMUX_MODE(MX31_PIN_CSPI3_MISO, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI3_SCLK__SCLK	IOMUX_MODE(MX31_PIN_CSPI3_SCLK, IOMUX_CONFIG_FUNC)
+#define MX31_PIN_CSPI3_SPI_RDY__SPI_RDY	IOMUX_MODE(MX31_PIN_CSPI3_SPI_RDY, IOMUX_CONFIG_FUNC)
+/*XXX: The SS0, SS1, SS2, SS3 lines of spi3 are multiplexed by cspi2_ss0, cspi2_ss1, cspi1_ss0
+ * cspi1_ss1*/
 
 /*
  * This function configures the pad value for a IOMUX pin.
diff --git a/arch/arm/plat-mxc/include/mach/irqs.h b/arch/arm/plat-mxc/include/mach/irqs.h
index 228c4f68ccd..b55bba35e18 100644
--- a/arch/arm/plat-mxc/include/mach/irqs.h
+++ b/arch/arm/plat-mxc/include/mach/irqs.h
@@ -12,5 +12,6 @@
 #define __ASM_ARCH_MXC_IRQS_H__
 
 #include <mach/hardware.h>
+extern void imx_irq_set_priority(unsigned char irq, unsigned char prio);
 
 #endif /* __ASM_ARCH_MXC_IRQS_H__ */
diff --git a/arch/arm/plat-mxc/include/mach/mx27.h b/arch/arm/plat-mxc/include/mach/mx27.h
index 212ecc24662..a86db64744a 100644
--- a/arch/arm/plat-mxc/include/mach/mx27.h
+++ b/arch/arm/plat-mxc/include/mach/mx27.h
@@ -128,6 +128,7 @@
  * it returns 0xDEADBEEF
  */
 #define IO_ADDRESS(x)   \
+	(void __iomem *) \
 	(((x >= AIPI_BASE_ADDR) && (x < (AIPI_BASE_ADDR + AIPI_SIZE))) ? \
 		AIPI_IO_ADDRESS(x) : \
 	((x >= SAHB1_BASE_ADDR) && (x < (SAHB1_BASE_ADDR + SAHB1_SIZE))) ? \
diff --git a/arch/arm/plat-mxc/include/mach/mx31.h b/arch/arm/plat-mxc/include/mach/mx31.h
index a7373e4a56c..0536f8917bc 100644
--- a/arch/arm/plat-mxc/include/mach/mx31.h
+++ b/arch/arm/plat-mxc/include/mach/mx31.h
@@ -198,6 +198,7 @@
  * it returns 0xDEADBEEF
  */
 #define IO_ADDRESS(x)   \
+	(void __iomem *) \
 	(((x >= IRAM_BASE_ADDR) && (x < (IRAM_BASE_ADDR + IRAM_SIZE))) ? IRAM_IO_ADDRESS(x):\
 	((x >= L2CC_BASE_ADDR) && (x < (L2CC_BASE_ADDR + L2CC_SIZE))) ? L2CC_IO_ADDRESS(x):\
 	((x >= AIPS1_BASE_ADDR) && (x < (AIPS1_BASE_ADDR + AIPS1_SIZE))) ? AIPS1_IO_ADDRESS(x):\
diff --git a/arch/arm/plat-mxc/include/mach/mxc.h b/arch/arm/plat-mxc/include/mach/mxc.h
index 332eda4dbd3..f6caab06213 100644
--- a/arch/arm/plat-mxc/include/mach/mxc.h
+++ b/arch/arm/plat-mxc/include/mach/mxc.h
@@ -33,4 +33,10 @@
 # define cpu_is_mx27() (0)
 #endif
 
+#if defined(CONFIG_ARCH_MX3) || defined(CONFIG_ARCH_MX2)
+#define CSCR_U(n) (IO_ADDRESS(WEIM_BASE_ADDR) + n * 0x10)
+#define CSCR_L(n) (IO_ADDRESS(WEIM_BASE_ADDR) + n * 0x10 + 0x4)
+#define CSCR_A(n) (IO_ADDRESS(WEIM_BASE_ADDR) + n * 0x10 + 0x8)
+#endif
+
 #endif /*  __ASM_ARCH_MXC_H__ */
diff --git a/arch/arm/plat-mxc/irq.c b/arch/arm/plat-mxc/irq.c
index c6b837893d8..d862c9e5f8d 100644
--- a/arch/arm/plat-mxc/irq.c
+++ b/arch/arm/plat-mxc/irq.c
@@ -30,14 +30,7 @@
 #define AVIC_INTENABLEL		(AVIC_BASE + 0x14)	/* int enable reg low */
 #define AVIC_INTTYPEH		(AVIC_BASE + 0x18)	/* int type reg high */
 #define AVIC_INTTYPEL		(AVIC_BASE + 0x1C)	/* int type reg low */
-#define AVIC_NIPRIORITY7	(AVIC_BASE + 0x20)	/* norm int priority lvl7 */
-#define AVIC_NIPRIORITY6	(AVIC_BASE + 0x24)	/* norm int priority lvl6 */
-#define AVIC_NIPRIORITY5	(AVIC_BASE + 0x28)	/* norm int priority lvl5 */
-#define AVIC_NIPRIORITY4	(AVIC_BASE + 0x2C)	/* norm int priority lvl4 */
-#define AVIC_NIPRIORITY3	(AVIC_BASE + 0x30)	/* norm int priority lvl3 */
-#define AVIC_NIPRIORITY2	(AVIC_BASE + 0x34)	/* norm int priority lvl2 */
-#define AVIC_NIPRIORITY1	(AVIC_BASE + 0x38)	/* norm int priority lvl1 */
-#define AVIC_NIPRIORITY0	(AVIC_BASE + 0x3C)	/* norm int priority lvl0 */
+#define AVIC_NIPRIORITY(x)	(AVIC_BASE + (0x20 + 4 * (7 - (x)))) /* int priority */
 #define AVIC_NIVECSR		(AVIC_BASE + 0x40)	/* norm int vector/status */
 #define AVIC_FIVECSR		(AVIC_BASE + 0x44)	/* fast int vector/status */
 #define AVIC_INTSRCH		(AVIC_BASE + 0x48)	/* int source reg high */
@@ -54,6 +47,24 @@
 #define IIM_PROD_REV_SH		3
 #define IIM_PROD_REV_LEN	5
 
+#ifdef CONFIG_MXC_IRQ_PRIOR
+void imx_irq_set_priority(unsigned char irq, unsigned char prio)
+{
+	unsigned int temp;
+	unsigned int mask = 0x0F << irq % 8 * 4;
+
+	if (irq > 63)
+		return;
+
+	temp = __raw_readl(AVIC_NIPRIORITY(irq / 8));
+	temp &= ~mask;
+	temp |= prio & mask;
+
+	__raw_writel(temp, AVIC_NIPRIORITY(irq / 8));
+}
+EXPORT_SYMBOL(imx_irq_set_priority);
+#endif
+
 /* Disable interrupt number "irq" in the AVIC */
 static void mxc_mask_irq(unsigned int irq)
 {
@@ -101,10 +112,9 @@ void __init mxc_init_irq(void)
 		set_irq_flags(i, IRQF_VALID);
 	}
 
-	/* Set WDOG2's interrupt the highest priority level (bit 28-31) */
-	reg = __raw_readl(AVIC_NIPRIORITY6);
-	reg |= (0xF << 28);
-	__raw_writel(reg, AVIC_NIPRIORITY6);
+	/* Set default priority value (0) for all IRQ's */
+	for (i = 0; i < 8; i++)
+		__raw_writel(0, AVIC_NIPRIORITY(i));
 
 	/* init architectures chained interrupt handler */
 	mxc_register_gpios();