add support for target 3c24xx (more known as Openmoko GTA02 "Freerunner") and merge it with the openmoko-target and the work Michael Buesch <mb> did

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13609 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 220 insertions, 0 deletions

diff --git a/target/linux/s3c24xx/patches/0046-introduce-fiq-use-timer3-as-source.patch.patch b/target/linux/s3c24xx/patches/0046-introduce-fiq-use-timer3-as-source.patch.patch
new file mode 100755
index 0000000000..ea8ae72fb0
--- /dev/null
+++ b/target/linux/s3c24xx/patches/0046-introduce-fiq-use-timer3-as-source.patch.patch
@@ -0,0 +1,220 @@
+From 26fa0c816d5e1b593128477c7e200fafe3caae18 Mon Sep 17 00:00:00 2001
+From: mokopatches <mokopatches@openmoko.org>
+Date: Fri, 25 Jul 2008 22:21:22 +0100
+Subject: [PATCH] introduce-fiq-use-timer3-as-source.patch
+
+This makes the FIQ stuff specific to one of the timers on the
+s3c244x and adds the platform stuff for fiq in the gta02 init
+
+Currently one sysfs node is exposed, a count of FIQ events
+
+cat /sys/devices/platform/sc32440_fiq.0/fiq/count
+
+From: Andy Green <andy@openmoko.com>
+Signed-off-by: Andy Green <andy@openmoko.com>
+---
+ arch/arm/mach-s3c2440/fiq_c_isr.c            |   56 +++++++++++++++++++++----
+ arch/arm/mach-s3c2440/fiq_c_isr.h            |    2 +
+ arch/arm/mach-s3c2440/mach-gta02.c           |   17 ++++++++
+ include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h |    2 +-
+ 4 files changed, 67 insertions(+), 10 deletions(-)
+
+diff --git a/arch/arm/mach-s3c2440/fiq_c_isr.c b/arch/arm/mach-s3c2440/fiq_c_isr.c
+index 12f4527..a71a234 100644
+--- a/arch/arm/mach-s3c2440/fiq_c_isr.c
++++ b/arch/arm/mach-s3c2440/fiq_c_isr.c
+@@ -18,6 +18,9 @@
+ #include <asm/plat-s3c24xx/cpu.h>
+ #include <asm/plat-s3c24xx/irq.h>
+ 
++#include <asm/arch/pwm.h>
++#include <asm/plat-s3c/regs-timer.h>
++
+ /*
+  * Major Caveats for using FIQ
+  * ---------------------------
+@@ -66,6 +69,10 @@ static u8 u8aFiqStack[4096];
+ u32 _fiq_ack_mask; /* used by isr exit define */
+ unsigned long _fiq_count_fiqs; /* used by isr exit define */
+ static int _fiq_irq; /* private ; irq index we were started with, or 0 */
++struct s3c2410_pwm pwm_timer_fiq;
++int _fiq_timer_index;
++u16 _fiq_timer_divisor;
++
+ 
+ /* this function must live in the monolithic kernel somewhere!  A module is
+  * NOT good enough!
+@@ -110,23 +117,45 @@ static struct attribute_group s3c2440_fiq_attr_group = {
+  * you still need to clear the source interrupt in S3C2410_INTMSK to get
+  * anything good happening
+  */
+-static void fiq_init_irq_source(int irq_index_fiq)
++static int fiq_init_irq_source(int irq_index_fiq)
+ {
++	int rc = 0;
++
+ 	if (!irq_index_fiq) /* no interrupt */
+-		return;
++		goto bail;
+ 
+-	printk(KERN_INFO"Enabling FIQ using int idx %d\n",
+-	       irq_index_fiq - S3C2410_CPUIRQ_OFFSET);
+ 	local_fiq_disable();
+ 
+ 	_fiq_irq = irq_index_fiq;
+ 	_fiq_ack_mask = 1 << (irq_index_fiq - S3C2410_CPUIRQ_OFFSET);
++	timer_index = (irq_index_fiq - IRQ_TIMER0);
++
++	/* set up the timer to operate as a pwm device */
++
++	rc = s3c2410_pwm_init(&pwm_timer_fiq);
++	if (rc)
++		goto bail;
++
++	pwm_timer_fiq.timerid = PWM0 + timer_index;
++	pwm_timer_fiq.prescaler = (6 - 1) / 2;
++	pwm_timer_fiq.divider = S3C2410_TCFG1_MUX3_DIV2;
++	/* default rate == ~32us */
++	pwm_timer_fiq.counter = pwm_timer_fiq.comparer =
++					timer_divisor = 64;
++
++	rc = s3c2410_pwm_enable(&pwm_timer_fiq);
++	if (rc)
++		goto bail;
++
++	s3c2410_pwm_start(&pwm_timer_fiq);
+ 
+ 	/* let our selected interrupt be a magic FIQ interrupt */
+ 	__raw_writel(_fiq_ack_mask, S3C2410_INTMOD);
+ 
+ 	/* it's ready to go as soon as we unmask the source in S3C2410_INTMSK */
+ 	local_fiq_enable();
++bail:
++	return rc;
+ }
+ 
+ 
+@@ -139,15 +168,13 @@ static void fiq_disable_irq_source(void)
+ 	_fiq_irq = 0; /* no active source interrupt now either */
+ }
+ 
+-/* this starts FIQ timer events... they continue until the FIQ ISR sees that
+- * its work is done and it turns off the timer.  After setting up the fiq_ipc
+- * struct with new work, you call this to start FIQ timer actions up again.
+- * Only the FIQ ISR decides when it is done and controls turning off the
+- * timer events.
++/*
++ * fiq_kick() forces a FIQ event to happen shortly after leaving the routine
+  */
+ void fiq_kick(void)
+ {
+ 	unsigned long flags;
++	u32 tcon;
+ 
+ 	/* we have to take care about FIQ because this modification is
+ 	 * non-atomic, FIQ could come in after the read and before the
+@@ -156,15 +183,24 @@ void fiq_kick(void)
+ 	 */
+ 	local_save_flags(flags);
+ 	local_fiq_disable();
++	/* allow FIQs to resume */
+ 	__raw_writel(__raw_readl(S3C2410_INTMSK) &
+ 		     ~(1 << (_fiq_irq - S3C2410_CPUIRQ_OFFSET)),
+ 		     S3C2410_INTMSK);
++	tcon = __raw_readl(S3C2410_TCON) & ~S3C2410_TCON_T3START;
++	/* fake the timer to a count of 1 */
++	__raw_writel(1, S3C2410_TCNTB(timer_index));
++	__raw_writel(tcon | S3C2410_TCON_T3MANUALUPD, S3C2410_TCON);
++	__raw_writel(tcon | S3C2410_TCON_T3MANUALUPD | S3C2410_TCON_T3START,
++		     S3C2410_TCON);
++	__raw_writel(tcon | S3C2410_TCON_T3START, S3C2410_TCON);
+ 	local_irq_restore(flags);
+ }
+ EXPORT_SYMBOL_GPL(fiq_kick);
+ 
+ 
+ 
++
+ static int __init sc32440_fiq_probe(struct platform_device *pdev)
+ {
+ 	struct resource *r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+@@ -172,6 +208,8 @@ static int __init sc32440_fiq_probe(struct platform_device *pdev)
+ 	if (!r)
+ 		return -EIO;
+ 	/* configure for the interrupt we are meant to use */
++	printk(KERN_INFO"Enabling FIQ using irq %d\n", r->start);
++
+ 	fiq_init_irq_source(r->start);
+ 
+ 	return sysfs_create_group(&pdev->dev.kobj, &s3c2440_fiq_attr_group);
+diff --git a/arch/arm/mach-s3c2440/fiq_c_isr.h b/arch/arm/mach-s3c2440/fiq_c_isr.h
+index f08740e..0c45eb7 100644
+--- a/arch/arm/mach-s3c2440/fiq_c_isr.h
++++ b/arch/arm/mach-s3c2440/fiq_c_isr.h
+@@ -5,6 +5,8 @@
+ 
+ extern unsigned long _fiq_count_fiqs;
+ extern u32 _fiq_ack_mask;
++extern int _fiq_timer_index;
++extern u16 _fiq_timer_divisor;
+ 
+ /* This CANNOT be implemented in a module -- it has to be used in code
+  * included in the monolithic kernel
+diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
+index 0bdd0e0..cb839b2 100644
+--- a/arch/arm/mach-s3c2440/mach-gta02.c
++++ b/arch/arm/mach-s3c2440/mach-gta02.c
+@@ -57,6 +57,7 @@
+ #include <asm/irq.h>
+ #include <asm/mach-types.h>
+ 
++#include <asm/arch-s3c2410/regs-irq.h>
+ #include <asm/arch/regs-gpio.h>
+ #include <asm/arch/regs-gpioj.h>
+ #include <asm/arch/fb.h>
+@@ -336,6 +337,21 @@ struct platform_device gta02_pmu_dev = {
+ 	},
+ };
+ 
++/* FIQ */
++
++static struct resource sc32440_fiq_resources[] = {
++	[0] = {
++		.flags	= IORESOURCE_IRQ,
++		.start	= IRQ_TIMER3,
++		.end	= IRQ_TIMER3,
++	},
++};
++
++struct platform_device sc32440_fiq_device = {
++	.name 		= "sc32440_fiq",
++	.num_resources	= 1,
++	.resource	= sc32440_fiq_resources,
++};
+ 
+ /* NOR Flash */
+ 
+@@ -403,6 +419,7 @@ static struct platform_device *gta02_devices[] __initdata = {
+ 	&s3c_device_nand,
+ 	&s3c_device_ts,
+ 	&gta02_nor_flash,
++	&sc32440_fiq_device,
+ };
+ 
+ static struct s3c2410_nand_set gta02_nand_sets[] = {
+diff --git a/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
+index 341f2bb..6cbd8e4 100644
+--- a/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
++++ b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
+@@ -22,7 +22,7 @@ struct fiq_ipc {
+ 
+ /* actual definition lives in arch/arm/mach-s3c2440/fiq_c_isr.c */
+ extern struct fiq_ipc fiq_ipc;
+-
++extern unsigned long _fiq_count_fiqs;
+ extern void fiq_kick(void);  /* provoke a FIQ "immediately" */
+ 
+ #endif /* _LINUX_FIQ_IPC_H */
+-- 
+1.5.6.3
+