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_