[ARM] 3240/2: AT91RM9200 support for 2.6 (Core)

Patch from SAN People

Following changes were made to clock.c:

1) Replaced <asm/hardware/clock.h> with <linux/clk.h>
2) Removed old unused clk_enable & clk_disable.
3) Replaced clk_use/clk_unuse with clk_enable/clk_disable.

Otherwise it's the same as the previous patch.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

10 files changed, 1733 insertions, 0 deletions

diff --git a/arch/arm/mach-at91rm9200/Kconfig b/arch/arm/mach-at91rm9200/Kconfig
new file mode 100644
index 00000000000..4b7218fc3eb
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/Kconfig
@@ -0,0 +1,54 @@
+if ARCH_AT91RM9200
+
+menu "AT91RM9200 Implementations"
+
+comment "AT91RM9200 Board Type"
+
+config ARCH_AT91RM9200DK
+	bool "Atmel AT91RM9200-DK Development board"
+	depends on ARCH_AT91RM9200
+	help
+	  Select this if you are using Atmel's AT91RM9200-DK Development board
+
+config MACH_AT91RM9200EK
+	bool "Atmel AT91RM9200-EK Evaluation Kit"
+	depends on ARCH_AT91RM9200
+	help
+	  Select this if you are using Atmel's AT91RM9200-EK Evaluation Kit
+
+config MACH_CSB337
+	bool "Cogent CSB337 board"
+	depends on ARCH_AT91RM9200
+	help
+	  Select this if you are using Cogent's CSB337 board
+
+config MACH_CSB637
+	bool "Cogent CSB637 board"
+	depends on ARCH_AT91RM9200
+	help
+	  Select this if you are using Cogent's CSB637 board
+
+config MACH_CARMEVA
+	bool "Conitec's ARM&EVA"
+	depends on ARCH_AT91RM9200
+	help
+	  Select this if you are using Conitec's AT91RM9200-MCU-Module
+
+config MACH_KB9200
+	bool "KwikByte's KB920x"
+	depends on ARCH_AT91RM9200
+	help
+	  Select this if you are using KwikByte's KB920x board
+
+
+comment "AT91RM9200 Feature Selections"
+
+config AT91_PROGRAMMABLE_CLOCKS
+	bool "Programmable Clocks"
+	help
+	  Select this if you need to program one or more of the PCK0..PCK3
+	  programmable clock outputs.
+
+endmenu
+
+endif
diff --git a/arch/arm/mach-at91rm9200/Makefile b/arch/arm/mach-at91rm9200/Makefile
new file mode 100644
index 00000000000..1f2805ca6e2
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/Makefile
@@ -0,0 +1,27 @@
+#
+# Makefile for the linux kernel.
+#
+
+obj-y		:= clock.o irq.o time.o gpio.o common.o devices.o
+obj-m		:=
+obj-n		:=
+obj-		:=
+
+# Board-specific support
+#obj-$(CONFIG_ARCH_AT91RM9200DK)	+= board-dk.o
+#obj-$(CONFIG_MACH_AT91RM9200EK)	+= board-ek.o
+#obj-$(CONFIG_MACH_CSB337)	+= board-csb337.o
+#obj-$(CONFIG_MACH_CSB637)	+= board-csb637.o
+#obj-$(CONFIG_MACH_CARMEVA)	+= board-carmeva.o
+#obj-$(CONFIG_MACH_KB9200)	+= board-kb9202.o
+
+# LEDs support
+#led-$(CONFIG_ARCH_AT91RM9200DK)	+= leds.o
+#led-$(CONFIG_MACH_AT91RM9200EK)	+= leds.o
+#led-$(CONFIG_MACH_CSB337)	+= leds.o
+#led-$(CONFIG_MACH_CSB637)	+= leds.o
+#led-$(CONFIG_MACH_KB9200)	+= leds.o
+obj-$(CONFIG_LEDS) += $(led-y)
+
+# VGA support
+#obj-$(CONFIG_FB_S1D13XXX)	+= ics1523.o
diff --git a/arch/arm/mach-at91rm9200/Makefile.boot b/arch/arm/mach-at91rm9200/Makefile.boot
new file mode 100644
index 00000000000..e667dcc7cd3
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/Makefile.boot
@@ -0,0 +1,9 @@
+# Note: the following conditions must always be true:
+#   ZRELADDR == virt_to_phys(TEXTADDR)
+#   PARAMS_PHYS must be within 4MB of ZRELADDR
+#   INITRD_PHYS must be in RAM
+
+   zreladdr-y	:= 0x20008000
+params_phys-y	:= 0x20000100
+initrd_phys-y	:= 0x20410000
+
diff --git a/arch/arm/mach-at91rm9200/clock.c b/arch/arm/mach-at91rm9200/clock.c
new file mode 100644
index 00000000000..ec8195a2a3c
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/clock.c
@@ -0,0 +1,620 @@
+/*
+ * linux/arch/arm/mach-at91rm9200/clock.c
+ *
+ * Copyright (C) 2005 David Brownell
+ * Copyright (C) 2005 Ivan Kokshaysky
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+
+#include <asm/semaphore.h>
+#include <asm/io.h>
+#include <asm/mach-types.h>
+
+#include <asm/arch/hardware.h>
+#include <asm/arch/board.h>		/* for master clock global */
+
+#include "generic.h"
+
+#undef	DEBUG
+
+/*
+ * There's a lot more which can be done with clocks, including cpufreq
+ * integration, slow clock mode support (for system suspend), letting
+ * PLLB be used at other rates (on boards that don't need USB), etc.
+ */
+
+struct clk {
+	const char	*name;
+	unsigned long	rate_hz;
+	struct clk	*parent;
+	u32		pmc_mask;
+	void		(*mode)(struct clk *, int);
+	unsigned	id:2;		/* PCK0..3, or 32k/main/a/b */
+	unsigned	primary:1;
+	unsigned	pll:1;
+	unsigned	programmable:1;
+	u16		users;
+};
+
+static spinlock_t	clk_lock;
+static u32		at91_pllb_usb_init;
+
+/*
+ * Four primary clock sources:  two crystal oscillators (32K, main), and
+ * two PLLs.  PLLA usually runs the master clock; and PLLB must run at
+ * 48 MHz (unless no USB function clocks are needed).  The main clock and
+ * both PLLs are turned off to run in "slow clock mode" (system suspend).
+ */
+static struct clk clk32k = {
+	.name		= "clk32k",
+	.rate_hz	= AT91_SLOW_CLOCK,
+	.users		= 1,		/* always on */
+	.id		= 0,
+	.primary	= 1,
+};
+static struct clk main_clk = {
+	.name		= "main",
+	.pmc_mask	= 1 << 0,	/* in PMC_SR */
+	.users		= 1,
+	.id		= 1,
+	.primary	= 1,
+};
+static struct clk plla = {
+	.name		= "plla",
+	.parent		= &main_clk,
+	.pmc_mask	= 1 << 1,	/* in PMC_SR */
+	.id		= 2,
+	.primary	= 1,
+	.pll		= 1,
+};
+
+static void pllb_mode(struct clk *clk, int is_on)
+{
+	u32	value;
+
+	if (is_on) {
+		is_on = AT91_PMC_LOCKB;
+		value = at91_pllb_usb_init;
+	} else
+		value = 0;
+
+	at91_sys_write(AT91_CKGR_PLLBR, value);
+
+	do {
+		cpu_relax();
+	} while ((at91_sys_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != is_on);
+}
+
+static struct clk pllb = {
+	.name		= "pllb",
+	.parent		= &main_clk,
+	.pmc_mask	= 1 << 2,	/* in PMC_SR */
+	.mode		= pllb_mode,
+	.id		= 3,
+	.primary	= 1,
+	.pll		= 1,
+};
+
+static void pmc_sys_mode(struct clk *clk, int is_on)
+{
+	if (is_on)
+		at91_sys_write(AT91_PMC_SCER, clk->pmc_mask);
+	else
+		at91_sys_write(AT91_PMC_SCDR, clk->pmc_mask);
+}
+
+/* USB function clocks (PLLB must be 48 MHz) */
+static struct clk udpck = {
+	.name		= "udpck",
+	.parent		= &pllb,
+	.pmc_mask	= AT91_PMC_UDP,
+	.mode		= pmc_sys_mode,
+};
+static struct clk uhpck = {
+	.name		= "uhpck",
+	.parent		= &pllb,
+	.pmc_mask	= AT91_PMC_UHP,
+	.mode		= pmc_sys_mode,
+};
+
+#ifdef CONFIG_AT91_PROGRAMMABLE_CLOCKS
+/*
+ * The four programmable clocks can be parented by any primary clock.
+ * You must configure pin multiplexing to bring these signals out.
+ */
+static struct clk pck0 = {
+	.name		= "pck0",
+	.pmc_mask	= AT91_PMC_PCK0,
+	.mode		= pmc_sys_mode,
+	.programmable	= 1,
+	.id		= 0,
+};
+static struct clk pck1 = {
+	.name		= "pck1",
+	.pmc_mask	= AT91_PMC_PCK1,
+	.mode		= pmc_sys_mode,
+	.programmable	= 1,
+	.id		= 1,
+};
+static struct clk pck2 = {
+	.name		= "pck2",
+	.pmc_mask	= AT91_PMC_PCK2,
+	.mode		= pmc_sys_mode,
+	.programmable	= 1,
+	.id		= 2,
+};
+static struct clk pck3 = {
+	.name		= "pck3",
+	.pmc_mask	= AT91_PMC_PCK3,
+	.mode		= pmc_sys_mode,
+	.programmable	= 1,
+	.id		= 3,
+};
+#endif	/* CONFIG_AT91_PROGRAMMABLE_CLOCKS */
+
+
+/*
+ * The master clock is divided from the CPU clock (by 1-4).  It's used for
+ * memory, interfaces to on-chip peripherals, the AIC, and sometimes more
+ * (e.g baud rate generation).  It's sourced from one of the primary clocks.
+ */
+static struct clk mck = {
+	.name		= "mck",
+	.pmc_mask	= 1 << 3,	/* in PMC_SR */
+	.users		= 1,		/* (must be) always on */
+};
+
+static void pmc_periph_mode(struct clk *clk, int is_on)
+{
+	if (is_on)
+		at91_sys_write(AT91_PMC_PCER, clk->pmc_mask);
+	else
+		at91_sys_write(AT91_PMC_PCDR, clk->pmc_mask);
+}
+
+static struct clk udc_clk = {
+	.name		= "udc_clk",
+	.parent		= &mck,
+	.pmc_mask	= 1 << AT91_ID_UDP,
+	.mode		= pmc_periph_mode,
+};
+static struct clk ohci_clk = {
+	.name		= "ohci_clk",
+	.parent		= &mck,
+	.pmc_mask	= 1 << AT91_ID_UHP,
+	.mode		= pmc_periph_mode,
+};
+
+static struct clk *const clock_list[] = {
+	/* four primary clocks -- MUST BE FIRST! */
+	&clk32k,
+	&main_clk,
+	&plla,
+	&pllb,
+
+	/* PLLB children (USB) */
+	&udpck,
+	&uhpck,
+
+#ifdef CONFIG_AT91_PROGRAMMABLE_CLOCKS
+	/* programmable clocks */
+	&pck0,
+	&pck1,
+	&pck2,
+	&pck3,
+#endif	/* CONFIG_AT91_PROGRAMMABLE_CLOCKS */
+
+	/* MCK and peripherals */
+	&mck,
+	// usart0..usart3
+	// mmc
+	&udc_clk,
+	// i2c
+	// spi
+	// ssc0..ssc2
+	// tc0..tc5
+	&ohci_clk,
+	// ether
+};
+
+
+/* clocks are all static for now; no refcounting necessary */
+struct clk *clk_get(struct device *dev, const char *id)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(clock_list); i++) {
+		if (strcmp(id, clock_list[i]->name) == 0)
+			return clock_list[i];
+	}
+
+	return ERR_PTR(-ENOENT);
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_put);
+
+static void __clk_enable(struct clk *clk)
+{
+	if (clk->parent)
+		__clk_enable(clk->parent);
+	if (clk->users++ == 0 && clk->mode)
+		clk->mode(clk, 1);
+}
+
+int clk_enable(struct clk *clk)
+{
+	unsigned long	flags;
+
+	spin_lock_irqsave(&clk_lock, flags);
+	__clk_enable(clk);
+	spin_unlock_irqrestore(&clk_lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+static void __clk_disable(struct clk *clk)
+{
+	BUG_ON(clk->users == 0);
+	if (--clk->users == 0 && clk->mode)
+		clk->mode(clk, 0);
+	if (clk->parent)
+		__clk_disable(clk->parent);
+}
+
+void clk_disable(struct clk *clk)
+{
+	unsigned long	flags;
+
+	spin_lock_irqsave(&clk_lock, flags);
+	__clk_disable(clk);
+	spin_unlock_irqrestore(&clk_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	unsigned long	flags;
+	unsigned long	rate;
+
+	spin_lock_irqsave(&clk_lock, flags);
+	for (;;) {
+		rate = clk->rate_hz;
+		if (rate || !clk->parent)
+			break;
+		clk = clk->parent;
+	}
+	spin_unlock_irqrestore(&clk_lock, flags);
+	return rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+/*------------------------------------------------------------------------*/
+
+#ifdef CONFIG_AT91_PROGRAMMABLE_CLOCKS
+
+/*
+ * For now, only the programmable clocks support reparenting (MCK could
+ * do this too, with care) or rate changing (the PLLs could do this too,
+ * ditto MCK but that's more for cpufreq).  Drivers may reparent to get
+ * a better rate match; we don't.
+ */
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+	unsigned long	flags;
+	unsigned	prescale;
+	unsigned long	actual;
+
+	if (!clk->programmable)
+		return -EINVAL;
+	spin_lock_irqsave(&clk_lock, flags);
+
+	actual = clk->parent->rate_hz;
+	for (prescale = 0; prescale < 7; prescale++) {
+		if (actual && actual <= rate)
+			break;
+		actual >>= 1;
+	}
+
+	spin_unlock_irqrestore(&clk_lock, flags);
+	return (prescale < 7) ? actual : -ENOENT;
+}
+EXPORT_SYMBOL(clk_round_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	unsigned long	flags;
+	unsigned	prescale;
+	unsigned long	actual;
+
+	if (!clk->programmable)
+		return -EINVAL;
+	if (clk->users)
+		return -EBUSY;
+	spin_lock_irqsave(&clk_lock, flags);
+
+	actual = clk->parent->rate_hz;
+	for (prescale = 0; prescale < 7; prescale++) {
+		if (actual && actual <= rate) {
+			u32	pckr;
+
+			pckr = at91_sys_read(AT91_PMC_PCKR(clk->id));
+			pckr &= 0x03;
+			pckr |= prescale << 2;
+			at91_sys_write(AT91_PMC_PCKR(clk->id), pckr);
+			clk->rate_hz = actual;
+			break;
+		}
+		actual >>= 1;
+	}
+
+	spin_unlock_irqrestore(&clk_lock, flags);
+	return (prescale < 7) ? actual : -ENOENT;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+struct clk *clk_get_parent(struct clk *clk)
+{
+	return clk->parent;
+}
+EXPORT_SYMBOL(clk_get_parent);
+
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	unsigned long	flags;
+
+	if (clk->users)
+		return -EBUSY;
+	if (!parent->primary || !clk->programmable)
+		return -EINVAL;
+	spin_lock_irqsave(&clk_lock, flags);
+
+	clk->rate_hz = parent->rate_hz;
+	clk->parent = parent;
+	at91_sys_write(AT91_PMC_PCKR(clk->id), parent->id);
+
+	spin_unlock_irqrestore(&clk_lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL(clk_set_parent);
+
+#endif	/* CONFIG_AT91_PROGRAMMABLE_CLOCKS */
+
+/*------------------------------------------------------------------------*/
+
+#ifdef CONFIG_DEBUG_FS
+
+static int at91_clk_show(struct seq_file *s, void *unused)
+{
+	u32		scsr, pcsr, sr;
+	unsigned	i;
+
+	seq_printf(s, "SCSR = %8x\n", scsr = at91_sys_read(AT91_PMC_SCSR));
+	seq_printf(s, "PCSR = %8x\n", pcsr = at91_sys_read(AT91_PMC_PCSR));
+
+	seq_printf(s, "MOR  = %8x\n", at91_sys_read(AT91_CKGR_MOR));
+	seq_printf(s, "MCFR = %8x\n", at91_sys_read(AT91_CKGR_MCFR));
+	seq_printf(s, "PLLA = %8x\n", at91_sys_read(AT91_CKGR_PLLAR));
+	seq_printf(s, "PLLB = %8x\n", at91_sys_read(AT91_CKGR_PLLBR));
+
+	seq_printf(s, "MCKR = %8x\n", at91_sys_read(AT91_PMC_MCKR));
+	for (i = 0; i < 4; i++)
+		seq_printf(s, "PCK%d = %8x\n", i, at91_sys_read(AT91_PMC_PCKR(i)));
+	seq_printf(s, "SR   = %8x\n", sr = at91_sys_read(AT91_PMC_SR));
+
+	seq_printf(s, "\n");
+
+	for (i = 0; i < ARRAY_SIZE(clock_list); i++) {
+		char		*state;
+		struct clk	*clk = clock_list[i];
+
+		if (clk->mode == pmc_sys_mode)
+			state = (scsr & clk->pmc_mask) ? "on" : "off";
+		else if (clk->mode == pmc_periph_mode)
+			state = (pcsr & clk->pmc_mask) ? "on" : "off";
+		else if (clk->pmc_mask)
+			state = (sr & clk->pmc_mask) ? "on" : "off";
+		else if (clk == &clk32k || clk == &main_clk)
+			state = "on";
+		else
+			state = "";
+
+		seq_printf(s, "%-10s users=%d %-3s %9ld Hz %s\n",
+			clk->name, clk->users, state, clk_get_rate(clk),
+			clk->parent ? clk->parent->name : "");
+	}
+	return 0;
+}
+
+static int at91_clk_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, at91_clk_show, NULL);
+}
+
+static struct file_operations at91_clk_operations = {
+	.open		= at91_clk_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int __init at91_clk_debugfs_init(void)
+{
+	/* /sys/kernel/debug/at91_clk */
+	(void) debugfs_create_file("at91_clk", S_IFREG | S_IRUGO, NULL, NULL, &at91_clk_operations);
+
+	return 0;
+}
+postcore_initcall(at91_clk_debugfs_init);
+
+#endif
+
+/*------------------------------------------------------------------------*/
+
+static u32 __init at91_pll_rate(struct clk *pll, u32 freq, u32 reg)
+{
+	unsigned mul, div;
+
+	div = reg & 0xff;
+	mul = (reg >> 16) & 0x7ff;
+	if (div && mul) {
+		freq /= div;
+		freq *= mul + 1;
+	} else
+		freq = 0;
+	if (pll == &pllb && (reg & (1 << 28)))
+		freq /= 2;
+	return freq;
+}
+
+static unsigned __init at91_pll_calc(unsigned main_freq, unsigned out_freq)
+{
+	unsigned i, div = 0, mul = 0, diff = 1 << 30;
+	unsigned ret = (out_freq > 155000000) ? 0xbe00 : 0x3e00;
+
+	/* PLL output max 240 MHz (or 180 MHz per errata) */
+	if (out_freq > 240000000)
+		goto fail;
+
+	for (i = 1; i < 256; i++) {
+		int diff1;
+		unsigned input, mul1;
+
+		/*
+		 * PLL input between 1MHz and 32MHz per spec, but lower
+		 * frequences seem necessary in some cases so allow 100K.
+		 */
+		input = main_freq / i;
+		if (input < 100000)
+			continue;
+		if (input > 32000000)
+			continue;
+
+		mul1 = out_freq / input;
+		if (mul1 > 2048)
+			continue;
+		if (mul1 < 2)
+			goto fail;
+
+		diff1 = out_freq - input * mul1;
+		if (diff1 < 0)
+			diff1 = -diff1;
+		if (diff > diff1) {
+			diff = diff1;
+			div = i;
+			mul = mul1;
+			if (diff == 0)
+				break;
+		}
+	}
+	if (i == 256 && diff > (out_freq >> 5))
+		goto fail;
+	return ret | ((mul - 1) << 16) | div;
+fail:
+	return 0;
+}
+
+int __init at91_clock_init(unsigned long main_clock)
+{
+	unsigned tmp, freq, mckr;
+
+	spin_lock_init(&clk_lock);
+
+	/*
+	 * When the bootloader initialized the main oscillator correctly,
+	 * there's no problem using the cycle counter.  But if it didn't,
+	 * or when using oscillator bypass mode, we must be told the speed
+	 * of the main clock.
+	 */
+	if (!main_clock) {
+		do {
+			tmp = at91_sys_read(AT91_CKGR_MCFR);
+		} while (!(tmp & 0x10000));
+		main_clock = (tmp & 0xffff) * (AT91_SLOW_CLOCK / 16);
+	}
+	main_clk.rate_hz = main_clock;
+
+	/* report if PLLA is more than mildly overclocked */
+	plla.rate_hz = at91_pll_rate(&plla, main_clock, at91_sys_read(AT91_CKGR_PLLAR));
+	if (plla.rate_hz > 209000000)
+		pr_info("Clocks: PLLA overclocked, %ld MHz\n", plla.rate_hz / 1000000);
+
+	/*
+	 * USB clock init:  choose 48 MHz PLLB value, turn all clocks off,
+	 * disable 48MHz clock during usb peripheral suspend.
+	 *
+	 * REVISIT:  assumes MCK doesn't derive from PLLB!
+	 */
+	at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2) | 0x10000000;
+	pllb.rate_hz = at91_pll_rate(&pllb, main_clock, at91_pllb_usb_init);
+	at91_sys_write(AT91_PMC_PCDR, (1 << AT91_ID_UHP) | (1 << AT91_ID_UDP));
+	at91_sys_write(AT91_PMC_SCDR, AT91_PMC_UHP | AT91_PMC_UDP);
+	at91_sys_write(AT91_CKGR_PLLBR, 0);
+	at91_sys_write(AT91_PMC_SCER, AT91_PMC_MCKUDP);
+
+	/*
+	 * MCK and CPU derive from one of those primary clocks.
+	 * For now, assume this parentage won't change.
+	 */
+	mckr = at91_sys_read(AT91_PMC_MCKR);
+	mck.parent = clock_list[mckr & AT91_PMC_CSS];
+	mck.parent->users++;
+	freq = mck.parent->rate_hz;
+	freq /= (1 << ((mckr >> 2) & 3));		/* prescale */
+	mck.rate_hz = freq / (1 + ((mckr >> 8) & 3));	/* mdiv */
+
+	printk("Clocks: CPU %u MHz, master %u MHz, main %u.%03u MHz\n",
+		freq / 1000000, (unsigned) mck.rate_hz / 1000000,
+		(unsigned) main_clock / 1000000,
+		((unsigned) main_clock % 1000000) / 1000);
+
+	/* FIXME get rid of master_clock global */
+	at91_master_clock = mck.rate_hz;
+
+#ifdef CONFIG_AT91_PROGRAMMABLE_CLOCKS
+	/* establish PCK0..PCK3 parentage */
+	for (tmp = 0; tmp < ARRAY_SIZE(clock_list); tmp++) {
+		struct clk	*clk = clock_list[tmp], *parent;
+		u32		pckr;
+
+		if (!clk->programmable)
+			continue;
+
+		pckr = at91_sys_read(AT91_PMC_PCKR(clk->id));
+		parent = clock_list[pckr & 3];
+		clk->parent = parent;
+		clk->rate_hz = parent->rate_hz / (1 << ((pckr >> 2) & 3));
+	}
+#else
+	/* disable unused clocks */
+	at91_sys_write(AT91_PMC_SCDR, AT91_PMC_PCK0 | AT91_PMC_PCK1 | AT91_PMC_PCK2 | AT91_PMC_PCK3);
+#endif	/* CONFIG_AT91_PROGRAMMABLE_CLOCKS */
+
+	/* FIXME several unused clocks may still be active...  provide
+	 * a CONFIG option to turn off all unused clocks at some point
+	 * before driver init starts.
+	 */
+
+	return 0;
+}
diff --git a/arch/arm/mach-at91rm9200/common.c b/arch/arm/mach-at91rm9200/common.c
new file mode 100644
index 00000000000..3848fd2d559
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/common.c
@@ -0,0 +1,115 @@
+/*
+ * arch/arm/mach-at91rm9200/common.c
+ *
+ *  Copyright (C) 2005 SAN People
+ *
+ * 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.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include <asm/arch/hardware.h>
+
+static struct map_desc at91rm9200_io_desc[] __initdata = {
+	{
+		.virtual	= AT91_VA_BASE_SYS,
+		.pfn		= __phys_to_pfn(AT91_BASE_SYS),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_SPI,
+		.pfn		= __phys_to_pfn(AT91_BASE_SPI),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_SSC2,
+		.pfn		= __phys_to_pfn(AT91_BASE_SSC2),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_SSC1,
+		.pfn		= __phys_to_pfn(AT91_BASE_SSC1),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_SSC0,
+		.pfn		= __phys_to_pfn(AT91_BASE_SSC0),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_US3,
+		.pfn		= __phys_to_pfn(AT91_BASE_US3),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_US2,
+		.pfn		= __phys_to_pfn(AT91_BASE_US2),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_US1,
+		.pfn		= __phys_to_pfn(AT91_BASE_US1),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_US0,
+		.pfn		= __phys_to_pfn(AT91_BASE_US0),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_EMAC,
+		.pfn		= __phys_to_pfn(AT91_BASE_EMAC),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_TWI,
+		.pfn		= __phys_to_pfn(AT91_BASE_TWI),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_MCI,
+		.pfn		= __phys_to_pfn(AT91_BASE_MCI),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_UDP,
+		.pfn		= __phys_to_pfn(AT91_BASE_UDP),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_TCB1,
+		.pfn		= __phys_to_pfn(AT91_BASE_TCB1),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_VA_BASE_TCB0,
+		.pfn		= __phys_to_pfn(AT91_BASE_TCB0),
+		.length		= SZ_16K,
+		.type		= MT_DEVICE,
+	},
+};
+
+void __init at91rm9200_map_io(void)
+{
+	iotable_init(at91rm9200_io_desc, ARRAY_SIZE(at91rm9200_io_desc));
+}
+
+
+unsigned long at91_master_clock;
+
+EXPORT_SYMBOL(at91_master_clock);
+
+
+int at91_serial_map[AT91_NR_UART];
+int at91_console_port;
+
+EXPORT_SYMBOL(at91_serial_map);
+EXPORT_SYMBOL(at91_console_port);
diff --git a/arch/arm/mach-at91rm9200/devices.c b/arch/arm/mach-at91rm9200/devices.c
new file mode 100644
index 00000000000..8df3e524565
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/devices.c
@@ -0,0 +1,291 @@
+/*
+ * arch/arm/mach-at91rm9200/devices.c
+ *
+ *  Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
+ *  Copyright (C) 2005 David Brownell
+ *
+ * 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.
+ *
+ */
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include <linux/config.h>
+#include <linux/platform_device.h>
+
+#include <asm/arch/board.h>
+#include <asm/arch/pio.h>
+
+
+/* --------------------------------------------------------------------
+ *  USB Host
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
+static u64 ohci_dmamask = 0xffffffffUL;
+static struct at91_usbh_data usbh_data;
+
+static struct resource at91rm9200_usbh_resource[] = {
+	[0] = {
+		.start	= AT91_UHP_BASE,
+		.end	= AT91_UHP_BASE + SZ_1M -1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= AT91_ID_UHP,
+		.end	= AT91_ID_UHP,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device at91rm9200_usbh_device = {
+	.name		= "at91rm9200-ohci",
+	.id		= -1,
+	.dev		= {
+				.dma_mask		= &ohci_dmamask,
+				.coherent_dma_mask	= 0xffffffff,
+				.platform_data		= &usbh_data,
+	},
+	.resource	= at91rm9200_usbh_resource,
+	.num_resources	= ARRAY_SIZE(at91rm9200_usbh_resource),
+};
+
+void __init at91_add_device_usbh(struct at91_usbh_data *data)
+{
+	if (!data)
+		return;
+
+	usbh_data = *data;
+	platform_device_register(&at91rm9200_usbh_device);
+}
+#else
+void __init at91_add_device_usbh(struct at91_usbh_data *data) {}
+#endif
+
+
+/* --------------------------------------------------------------------
+ *  USB Device (Gadget)
+ * -------------------------------------------------------------------- */
+
+#ifdef CONFIG_USB_GADGET_AT91
+static struct at91_udc_data udc_data;
+
+static struct resource at91_udc_resources[] = {
+	{
+		.start	= AT91_BASE_UDP,
+		.end	= AT91_BASE_UDP + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	}
+};
+
+static struct platform_device at91rm9200_udc_device = {
+	.name		= "at91_udc",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &udc_data,
+	},
+	.resource	= at91_udc_resources,
+	.num_resources	= ARRAY_SIZE(at91_udc_resources),
+};
+
+void __init at91_add_device_udc(struct at91_udc_data *data)
+{
+	if (!data)
+		return;
+
+	if (data->vbus_pin) {
+		at91_set_gpio_input(data->vbus_pin, 0);
+		at91_set_deglitch(data->vbus_pin, 1);
+	}
+	if (data->pullup_pin)
+		at91_set_gpio_output(data->pullup_pin, 0);
+
+	udc_data = *data;
+	platform_device_register(&at91rm9200_udc_device);
+}
+#else
+void __init at91_add_device_udc(struct at91_udc_data *data) {}
+#endif
+
+
+/* --------------------------------------------------------------------
+ *  Ethernet
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_ARM_AT91_ETHER) || defined(CONFIG_ARM_AT91_ETHER_MODULE)
+static u64 eth_dmamask = 0xffffffffUL;
+static struct at91_eth_data eth_data;
+
+static struct platform_device at91rm9200_eth_device = {
+	.name		= "at91_ether",
+	.id		= -1,
+	.dev		= {
+				.dma_mask		= &eth_dmamask,
+				.coherent_dma_mask	= 0xffffffff,
+				.platform_data		= &eth_data,
+	},
+	.num_resources	= 0,
+};
+
+void __init at91_add_device_eth(struct at91_eth_data *data)
+{
+	if (!data)
+		return;
+
+	if (data->phy_irq_pin) {
+		at91_set_gpio_input(data->phy_irq_pin, 0);
+		at91_set_deglitch(data->phy_irq_pin, 1);
+	}
+
+	/* Pins used for MII and RMII */
+	at91_set_A_periph(AT91_PIN_PA16, 0);	/* EMDIO */
+	at91_set_A_periph(AT91_PIN_PA15, 0);	/* EMDC */
+	at91_set_A_periph(AT91_PIN_PA14, 0);	/* ERXER */
+	at91_set_A_periph(AT91_PIN_PA13, 0);	/* ERX1 */
+	at91_set_A_periph(AT91_PIN_PA12, 0);	/* ERX0 */
+	at91_set_A_periph(AT91_PIN_PA11, 0);	/* ECRS_ECRSDV */
+	at91_set_A_periph(AT91_PIN_PA10, 0);	/* ETX1 */
+	at91_set_A_periph(AT91_PIN_PA9, 0);	/* ETX0 */
+	at91_set_A_periph(AT91_PIN_PA8, 0);	/* ETXEN */
+	at91_set_A_periph(AT91_PIN_PA7, 0);	/* ETXCK_EREFCK */
+
+	if (!data->is_rmii) {
+		at91_set_B_periph(AT91_PIN_PB19, 0);	/* ERXCK */
+		at91_set_B_periph(AT91_PIN_PB18, 0);	/* ECOL */
+		at91_set_B_periph(AT91_PIN_PB17, 0);	/* ERXDV */
+		at91_set_B_periph(AT91_PIN_PB16, 0);	/* ERX3 */
+		at91_set_B_periph(AT91_PIN_PB15, 0);	/* ERX2 */
+		at91_set_B_periph(AT91_PIN_PB14, 0);	/* ETXER */
+		at91_set_B_periph(AT91_PIN_PB13, 0);	/* ETX3 */
+		at91_set_B_periph(AT91_PIN_PB12, 0);	/* ETX2 */
+	}
+
+	eth_data = *data;
+	platform_device_register(&at91rm9200_eth_device);
+}
+#else
+void __init at91_add_device_eth(struct at91_eth_data *data) {}
+#endif
+
+
+/* --------------------------------------------------------------------
+ *  Compact Flash / PCMCIA
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_AT91_CF) || defined(CONFIG_AT91_CF_MODULE)
+static struct at91_cf_data cf_data;
+
+static struct platform_device at91rm9200_cf_device = {
+	.name		= "at91_cf",
+	.id		= -1,
+	.dev		= {
+				.platform_data		= &cf_data,
+	},
+	.num_resources	= 0,
+};
+
+void __init at91_add_device_cf(struct at91_cf_data *data)
+{
+	if (!data)
+		return;
+
+	/* input/irq */
+	if (data->irq_pin) {
+		at91_set_gpio_input(data->irq_pin, 1);
+		at91_set_deglitch(data->irq_pin, 1);
+	}
+	at91_set_gpio_input(data->det_pin, 1);
+	at91_set_deglitch(data->det_pin, 1);
+
+	/* outputs, initially off */
+	if (data->vcc_pin)
+		at91_set_gpio_output(data->vcc_pin, 0);
+	at91_set_gpio_output(data->rst_pin, 0);
+
+	cf_data = *data;
+	platform_device_register(&at91rm9200_cf_device);
+}
+#else
+void __init at91_add_device_cf(struct at91_cf_data *data) {}
+#endif
+
+
+/* --------------------------------------------------------------------
+ *  MMC / SD
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_MMC_AT91RM9200) || defined(CONFIG_MMC_AT91RM9200_MODULE)
+static u64 mmc_dmamask = 0xffffffffUL;
+static struct at91_mmc_data mmc_data;
+
+static struct resource at91_mmc_resources[] = {
+	{
+		.start	= AT91_BASE_MCI,
+		.end	= AT91_BASE_MCI + SZ_16K - 1,
+		.flags	= IORESOURCE_MEM,
+	}
+};
+
+static struct platform_device at91rm9200_mmc_device = {
+	.name		= "at91rm9200_mci",
+	.id		= -1,
+	.dev		= {
+				.dma_mask		= &mmc_dmamask,
+				.coherent_dma_mask	= 0xffffffff,
+				.platform_data		= &mmc_data,
+	},
+	.resource	= at91_mmc_resources,
+	.num_resources	= ARRAY_SIZE(at91_mmc_resources),
+};
+
+void __init at91_add_device_mmc(struct at91_mmc_data *data)
+{
+	if (!data)
+		return;
+
+	/* input/irq */
+	if (data->det_pin) {
+		at91_set_gpio_input(data->det_pin, 1);
+		at91_set_deglitch(data->det_pin, 1);
+	}
+	if (data->wp_pin)
+		at91_set_gpio_input(data->wp_pin, 1);
+
+	/* CLK */
+	at91_set_A_periph(AT91_PIN_PA27, 0);
+
+	if (data->is_b) {
+		/* CMD */
+		at91_set_B_periph(AT91_PIN_PA8, 0);
+
+		/* DAT0, maybe DAT1..DAT3 */
+		at91_set_B_periph(AT91_PIN_PA9, 0);
+		if (data->wire4) {
+			at91_set_B_periph(AT91_PIN_PA10, 0);
+			at91_set_B_periph(AT91_PIN_PA11, 0);
+			at91_set_B_periph(AT91_PIN_PA12, 0);
+		}
+	} else {
+		/* CMD */
+		at91_set_A_periph(AT91_PIN_PA28, 0);
+
+		/* DAT0, maybe DAT1..DAT3 */
+		at91_set_A_periph(AT91_PIN_PA29, 0);
+		if (data->wire4) {
+			at91_set_B_periph(AT91_PIN_PB3, 0);
+			at91_set_B_periph(AT91_PIN_PB4, 0);
+			at91_set_B_periph(AT91_PIN_PB5, 0);
+		}
+	}
+
+	mmc_data = *data;
+	platform_device_register(&at91rm9200_mmc_device);
+}
+#else
+void __init at91_add_device_mmc(struct at91_mmc_data *data) {}
+#endif
+
+/* -------------------------------------------------------------------- */
diff --git a/arch/arm/mach-at91rm9200/generic.h b/arch/arm/mach-at91rm9200/generic.h
new file mode 100644
index 00000000000..9bd541eba0a
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/generic.h
@@ -0,0 +1,18 @@
+/*
+ * linux/arch/arm/mach-at91rm9200/generic.h
+ *
+ *  Copyright (C) 2005 David Brownell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+void at91_gpio_irq_setup(unsigned banks);
+
+struct sys_timer;
+extern struct sys_timer at91rm9200_timer;
+
+extern void __init at91rm9200_map_io(void);
+
+extern int __init at91_clock_init(unsigned long main_clock);
diff --git a/arch/arm/mach-at91rm9200/gpio.c b/arch/arm/mach-at91rm9200/gpio.c
new file mode 100644
index 00000000000..2fd2ef583e4
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/gpio.c
@@ -0,0 +1,302 @@
+/*
+ * linux/arch/arm/mach-at91rm9200/gpio.c
+ *
+ * Copyright (C) 2005 HP Labs
+ *
+ * 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/mach/irq.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/gpio.h>
+
+static const u32 pio_controller_offset[4] = {
+	AT91_PIOA,
+	AT91_PIOB,
+	AT91_PIOC,
+	AT91_PIOD,
+};
+
+static inline void __iomem *pin_to_controller(unsigned pin)
+{
+	void __iomem *sys_base = (void __iomem *) AT91_VA_BASE_SYS;
+
+	pin -= PIN_BASE;
+	pin /= 32;
+	if (likely(pin < BGA_GPIO_BANKS))
+		return sys_base + pio_controller_offset[pin];
+
+	return NULL;
+}
+
+static inline unsigned pin_to_mask(unsigned pin)
+{
+	pin -= PIN_BASE;
+	return 1 << (pin % 32);
+}
+
+
+/*--------------------------------------------------------------------------*/
+
+/* Not all hardware capabilities are exposed through these calls; they
+ * only encapsulate the most common features and modes.  (So if you
+ * want to change signals in groups, do it directly.)
+ *
+ * Bootloaders will usually handle some of the pin multiplexing setup.
+ * The intent is certainly that by the time Linux is fully booted, all
+ * pins should have been fully initialized.  These setup calls should
+ * only be used by board setup routines, or possibly in driver probe().
+ *
+ * For bootloaders doing all that setup, these calls could be inlined
+ * as NOPs so Linux won't duplicate any setup code
+ */
+
+
+/*
+ * mux the pin to the "A" internal peripheral role.
+ */
+int __init_or_module at91_set_A_periph(unsigned pin, int use_pullup)
+{
+	void __iomem	*pio = pin_to_controller(pin);
+	unsigned	mask = pin_to_mask(pin);
+
+	if (!pio)
+		return -EINVAL;
+
+	__raw_writel(mask, pio + PIO_IDR);
+	__raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
+	__raw_writel(mask, pio + PIO_ASR);
+	__raw_writel(mask, pio + PIO_PDR);
+	return 0;
+}
+EXPORT_SYMBOL(at91_set_A_periph);
+
+
+/*
+ * mux the pin to the "B" internal peripheral role.
+ */
+int __init_or_module at91_set_B_periph(unsigned pin, int use_pullup)
+{
+	void __iomem	*pio = pin_to_controller(pin);
+	unsigned	mask = pin_to_mask(pin);
+
+	if (!pio)
+		return -EINVAL;
+
+	__raw_writel(mask, pio + PIO_IDR);
+	__raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
+	__raw_writel(mask, pio + PIO_BSR);
+	__raw_writel(mask, pio + PIO_PDR);
+	return 0;
+}
+EXPORT_SYMBOL(at91_set_B_periph);
+
+
+/*
+ * mux the pin to the gpio controller (instead of "A" or "B" peripheral), and
+ * configure it for an input.
+ */
+int __init_or_module at91_set_gpio_input(unsigned pin, int use_pullup)
+{
+	void __iomem	*pio = pin_to_controller(pin);
+	unsigned	mask = pin_to_mask(pin);
+
+	if (!pio)
+		return -EINVAL;
+
+	__raw_writel(mask, pio + PIO_IDR);
+	__raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
+	__raw_writel(mask, pio + PIO_ODR);
+	__raw_writel(mask, pio + PIO_PER);
+	return 0;
+}
+EXPORT_SYMBOL(at91_set_gpio_input);
+
+
+/*
+ * mux the pin to the gpio controller (instead of "A" or "B" peripheral),
+ * and configure it for an output.
+ */
+int __init_or_module at91_set_gpio_output(unsigned pin, int value)
+{
+	void __iomem	*pio = pin_to_controller(pin);
+	unsigned	mask = pin_to_mask(pin);
+
+	if (!pio)
+		return -EINVAL;
+
+	__raw_writel(mask, pio + PIO_IDR);
+	__raw_writel(mask, pio + PIO_PUDR);
+	__raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
+	__raw_writel(mask, pio + PIO_OER);
+	__raw_writel(mask, pio + PIO_PER);
+	return 0;
+}
+EXPORT_SYMBOL(at91_set_gpio_output);
+
+
+/*
+ * enable/disable the glitch filter; mostly used with IRQ handling.
+ */
+int __init_or_module at91_set_deglitch(unsigned pin, int is_on)
+{
+	void __iomem	*pio = pin_to_controller(pin);
+	unsigned	mask = pin_to_mask(pin);
+
+	if (!pio)
+		return -EINVAL;
+	__raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
+	return 0;
+}
+EXPORT_SYMBOL(at91_set_deglitch);
+
+/*--------------------------------------------------------------------------*/
+
+
+/*
+ * assuming the pin is muxed as a gpio output, set its value.
+ */
+int at91_set_gpio_value(unsigned pin, int value)
+{
+	void __iomem	*pio = pin_to_controller(pin);
+	unsigned	mask = pin_to_mask(pin);
+
+	if (!pio)
+		return -EINVAL;
+	__raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
+	return 0;
+}
+EXPORT_SYMBOL(at91_set_gpio_value);
+
+
+/*
+ * read the pin's value (works even if it's not muxed as a gpio).
+ */
+int at91_get_gpio_value(unsigned pin)
+{
+	void __iomem	*pio = pin_to_controller(pin);
+	unsigned	mask = pin_to_mask(pin);
+	u32		pdsr;
+
+	if (!pio)
+		return -EINVAL;
+	pdsr = __raw_readl(pio + PIO_PDSR);
+	return (pdsr & mask) != 0;
+}
+EXPORT_SYMBOL(at91_get_gpio_value);
+
+/*--------------------------------------------------------------------------*/
+
+
+/* Several AIC controller irqs are dispatched through this GPIO handler.
+ * To use any AT91_PIN_* as an externally triggered IRQ, first call
+ * at91_set_gpio_input() then maybe enable its glitch filter.
+ * Then just request_irq() with the pin ID; it works like any ARM IRQ
+ * handler, though it always triggers on rising and falling edges.
+ *
+ * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
+ * configuring them with at91_set_a_periph() or at91_set_b_periph().
+ * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
+ */
+
+static void gpio_irq_mask(unsigned pin)
+{
+	void __iomem	*pio = pin_to_controller(pin);
+	unsigned	mask = pin_to_mask(pin);
+
+	if (pio)
+		__raw_writel(mask, pio + PIO_IDR);
+}
+
+static void gpio_irq_unmask(unsigned pin)
+{
+	void __iomem	*pio = pin_to_controller(pin);
+	unsigned	mask = pin_to_mask(pin);
+
+	if (pio)
+		__raw_writel(mask, pio + PIO_IER);
+}
+
+static int gpio_irq_type(unsigned pin, unsigned type)
+{
+	return (type == IRQT_BOTHEDGE) ? 0 : -EINVAL;
+}
+
+static struct irqchip gpio_irqchip = {
+	.mask		= gpio_irq_mask,
+	.unmask		= gpio_irq_unmask,
+	.set_type	= gpio_irq_type,
+};
+
+static void gpio_irq_handler(unsigned irq, struct irqdesc *desc, struct pt_regs *regs)
+{
+	unsigned	pin;
+	struct irqdesc	*gpio;
+	void __iomem	*pio;
+	u32		isr;
+
+	pio = (void __force __iomem *) desc->chipdata;
+
+	/* temporarily mask (level sensitive) parent IRQ */
+	desc->chip->ack(irq);
+	for (;;) {
+		isr = __raw_readl(pio + PIO_ISR) & __raw_readl(pio + PIO_IMR);
+		if (!isr)
+			break;
+
+		pin = (unsigned) desc->data;
+		gpio = &irq_desc[pin];
+
+		while (isr) {
+			if (isr & 1)
+				gpio->handle(pin, gpio, regs);
+			pin++;
+			gpio++;
+			isr >>= 1;
+		}
+	}
+	desc->chip->unmask(irq);
+	/* now it may re-trigger */
+}
+
+/* call this from board-specific init_irq */
+void __init at91_gpio_irq_setup(unsigned banks)
+{
+	unsigned	pioc, pin, id;
+
+	if (banks > 4)
+		banks = 4;
+	for (pioc = 0, pin = PIN_BASE, id = AT91_ID_PIOA;
+			pioc < banks;
+			pioc++, id++) {
+		void __iomem	*controller;
+		unsigned	i;
+
+		controller = (void __iomem *) AT91_VA_BASE_SYS + pio_controller_offset[pioc];
+		__raw_writel(~0, controller + PIO_IDR);
+
+		set_irq_data(id, (void *) pin);
+		set_irq_chipdata(id, (void __force *) controller);
+
+		for (i = 0; i < 32; i++, pin++) {
+			set_irq_chip(pin, &gpio_irqchip);
+			set_irq_handler(pin, do_simple_IRQ);
+			set_irq_flags(pin, IRQF_VALID);
+		}
+
+		set_irq_chained_handler(id, gpio_irq_handler);
+
+		/* enable the PIO peripheral clock */
+		at91_sys_write(AT91_PMC_PCER, 1 << id);
+	}
+	pr_info("AT91: %d gpio irqs in %d banks\n", pin - PIN_BASE, banks);
+}
diff --git a/arch/arm/mach-at91rm9200/irq.c b/arch/arm/mach-at91rm9200/irq.c
new file mode 100644
index 00000000000..cb62bc83a1d
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/irq.c
@@ -0,0 +1,170 @@
+/*
+ * linux/arch/arm/mach-at91rm9200/irq.c
+ *
+ *  Copyright (C) 2004 SAN People
+ *  Copyright (C) 2004 ATMEL
+ *  Copyright (C) Rick Bronson
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/types.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+#include <asm/setup.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/irq.h>
+#include <asm/mach/map.h>
+
+#include "generic.h"
+
+/*
+ * The default interrupt priority levels (0 = lowest, 7 = highest).
+ */
+static unsigned int at91rm9200_default_irq_priority[NR_AIC_IRQS] __initdata = {
+	7,	/* Advanced Interrupt Controller */
+	7,	/* System Peripheral */
+	0,	/* Parallel IO Controller A */
+	0,	/* Parallel IO Controller B */
+	0,	/* Parallel IO Controller C */
+	0,	/* Parallel IO Controller D */
+	6,	/* USART 0 */
+	6,	/* USART 1 */
+	6,	/* USART 2 */
+	6,	/* USART 3 */
+	0,	/* Multimedia Card Interface */
+	4,	/* USB Device Port */
+	0,	/* Two-Wire Interface */
+	6,	/* Serial Peripheral Interface */
+	5,	/* Serial Synchronous Controller */
+	5,	/* Serial Synchronous Controller */
+	5,	/* Serial Synchronous Controller */
+	0,	/* Timer Counter 0 */
+	0,	/* Timer Counter 1 */
+	0,	/* Timer Counter 2 */
+	0,	/* Timer Counter 3 */
+	0,	/* Timer Counter 4 */
+	0,	/* Timer Counter 5 */
+	3,	/* USB Host port */
+	3,	/* Ethernet MAC */
+	0,	/* Advanced Interrupt Controller */
+	0,	/* Advanced Interrupt Controller */
+	0,	/* Advanced Interrupt Controller */
+	0,	/* Advanced Interrupt Controller */
+	0,	/* Advanced Interrupt Controller */
+	0,	/* Advanced Interrupt Controller */
+	0	/* Advanced Interrupt Controller */
+};
+
+
+static void at91rm9200_mask_irq(unsigned int irq)
+{
+	/* Disable interrupt on AIC */
+	at91_sys_write(AT91_AIC_IDCR, 1 << irq);
+}
+
+static void at91rm9200_unmask_irq(unsigned int irq)
+{
+	/* Enable interrupt on AIC */
+	at91_sys_write(AT91_AIC_IECR, 1 << irq);
+}
+
+static int at91rm9200_irq_type(unsigned irq, unsigned type)
+{
+	unsigned int smr, srctype;
+
+	/* change triggering only for FIQ and external IRQ0..IRQ6 */
+	if ((irq < AT91_ID_IRQ0) && (irq != AT91_ID_FIQ))
+		return -EINVAL;
+
+	switch (type) {
+	case IRQT_HIGH:
+		srctype = AT91_AIC_SRCTYPE_HIGH;
+		break;
+	case IRQT_RISING:
+		srctype = AT91_AIC_SRCTYPE_RISING;
+		break;
+	case IRQT_LOW:
+		srctype = AT91_AIC_SRCTYPE_LOW;
+		break;
+	case IRQT_FALLING:
+		srctype = AT91_AIC_SRCTYPE_FALLING;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	smr = at91_sys_read(AT91_AIC_SMR(irq)) & ~AT91_AIC_SRCTYPE;
+	at91_sys_write(AT91_AIC_SMR(irq), smr | srctype);
+	return 0;
+}
+
+static struct irqchip at91rm9200_irq_chip = {
+	.ack		= at91rm9200_mask_irq,
+	.mask		= at91rm9200_mask_irq,
+	.unmask		= at91rm9200_unmask_irq,
+	.set_type	= at91rm9200_irq_type,
+};
+
+/*
+ * Initialize the AIC interrupt controller.
+ */
+void __init at91rm9200_init_irq(unsigned int priority[NR_AIC_IRQS])
+{
+	unsigned int i;
+
+	/* No priority list specified for this board -> use defaults */
+	if (priority == NULL)
+		priority = at91rm9200_default_irq_priority;
+
+	/*
+	 * The IVR is used by macro get_irqnr_and_base to read and verify.
+	 * The irq number is NR_AIC_IRQS when a spurious interrupt has occurred.
+	 */
+	for (i = 0; i < NR_AIC_IRQS; i++) {
+		/* Put irq number in Source Vector Register: */
+		at91_sys_write(AT91_AIC_SVR(i), i);
+		/* Store the Source Mode Register as defined in table above */
+		at91_sys_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW | priority[i]);
+
+		set_irq_chip(i, &at91rm9200_irq_chip);
+		set_irq_handler(i, do_level_IRQ);
+		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+
+		/* Perform 8 End Of Interrupt Command to make sure AIC will not Lock out nIRQ */
+		if (i < 8)
+			at91_sys_write(AT91_AIC_EOICR, 0);
+	}
+
+	/*
+	 * Spurious Interrupt ID in Spurious Vector Register is NR_AIC_IRQS
+	 * When there is no current interrupt, the IRQ Vector Register reads the value stored in AIC_SPU
+	 */
+	at91_sys_write(AT91_AIC_SPU, NR_AIC_IRQS);
+
+	/* No debugging in AIC: Debug (Protect) Control Register */
+	at91_sys_write(AT91_AIC_DCR, 0);
+
+	/* Disable and clear all interrupts initially */
+	at91_sys_write(AT91_AIC_IDCR, 0xFFFFFFFF);
+	at91_sys_write(AT91_AIC_ICCR, 0xFFFFFFFF);
+}
diff --git a/arch/arm/mach-at91rm9200/time.c b/arch/arm/mach-at91rm9200/time.c
new file mode 100644
index 00000000000..1b6dd2deeb2
--- /dev/null
+++ b/arch/arm/mach-at91rm9200/time.c
@@ -0,0 +1,127 @@
+/*
+ * linux/arch/arm/mach-at91rm9200/time.c
+ *
+ *  Copyright (C) 2003 SAN People
+ *  Copyright (C) 2003 ATMEL
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mach/time.h>
+
+/*
+ * The ST_CRTR is updated asynchronously to the master clock.  It is therefore
+ *  necessary to read it twice (with the same value) to ensure accuracy.
+ */
+static inline unsigned long read_CRTR(void) {
+	unsigned long x1, x2;
+
+	do {
+		x1 = at91_sys_read(AT91_ST_CRTR);
+		x2 = at91_sys_read(AT91_ST_CRTR);
+	} while (x1 != x2);
+
+	return x1;
+}
+
+/*
+ * Returns number of microseconds since last timer interrupt.  Note that interrupts
+ * will have been disabled by do_gettimeofday()
+ *  'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy.
+ *  'tick' is usecs per jiffy (linux/timex.h).
+ */
+static unsigned long at91rm9200_gettimeoffset(void)
+{
+	unsigned long elapsed;
+
+	elapsed = (read_CRTR() - at91_sys_read(AT91_ST_RTAR)) & AT91_ST_ALMV;
+
+	return (unsigned long)(elapsed * (tick_nsec / 1000)) / LATCH;
+}
+
+/*
+ * IRQ handler for the timer.
+ */
+static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	unsigned long rtar;
+
+	if (at91_sys_read(AT91_ST_SR) & AT91_ST_PITS) {	/* This is a shared interrupt */
+		write_seqlock(&xtime_lock);
+
+		do {
+			timer_tick(regs);
+			rtar = (at91_sys_read(AT91_ST_RTAR) + LATCH) & AT91_ST_ALMV;
+			at91_sys_write(AT91_ST_RTAR, rtar);
+		} while (((read_CRTR() - at91_sys_read(AT91_ST_RTAR)) & AT91_ST_ALMV) >= LATCH);
+
+		write_sequnlock(&xtime_lock);
+
+		return IRQ_HANDLED;
+	}
+	else
+		return IRQ_NONE;		/* not handled */
+}
+
+static struct irqaction at91rm9200_timer_irq = {
+	.name		= "at91_tick",
+	.flags		= SA_SHIRQ | SA_INTERRUPT,
+	.handler	= at91rm9200_timer_interrupt
+};
+
+/*
+ * Set up timer interrupt.
+ */
+void __init at91rm9200_timer_init(void)
+{
+	/* Disable all timer interrupts */
+	at91_sys_write(AT91_ST_IDR, AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS);
+	(void) at91_sys_read(AT91_ST_SR);	/* Clear any pending interrupts */
+
+	/*
+	 * Make IRQs happen for the system timer.
+	 */
+	setup_irq(AT91_ID_SYS, &at91rm9200_timer_irq);
+
+	/* Set initial alarm to 0 */
+	at91_sys_write(AT91_ST_RTAR, 0);
+
+	/* Real time counter incremented every 30.51758 microseconds */
+	at91_sys_write(AT91_ST_RTMR, 1);
+
+	/* Set Period Interval timer */
+	at91_sys_write(AT91_ST_PIMR, LATCH);
+
+	/* Change the kernel's 'tick' value to 10009 usec. (the default is 10000) */
+	tick_usec = (LATCH * 1000000) / CLOCK_TICK_RATE;
+
+	/* Enable Period Interval Timer interrupt */
+	at91_sys_write(AT91_ST_IER, AT91_ST_PITS);
+}
+
+struct sys_timer at91rm9200_timer = {
+	.init		= at91rm9200_timer_init,
+	.offset		= at91rm9200_gettimeoffset,
+};