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221 lines
6.7 KiB
Diff
Executable File
221 lines
6.7 KiB
Diff
Executable File
From 26fa0c816d5e1b593128477c7e200fafe3caae18 Mon Sep 17 00:00:00 2001
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From: mokopatches <mokopatches@openmoko.org>
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Date: Fri, 25 Jul 2008 22:21:22 +0100
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Subject: [PATCH] introduce-fiq-use-timer3-as-source.patch
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This makes the FIQ stuff specific to one of the timers on the
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s3c244x and adds the platform stuff for fiq in the gta02 init
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Currently one sysfs node is exposed, a count of FIQ events
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cat /sys/devices/platform/sc32440_fiq.0/fiq/count
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From: Andy Green <andy@openmoko.com>
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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arch/arm/mach-s3c2440/fiq_c_isr.c | 56 +++++++++++++++++++++----
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arch/arm/mach-s3c2440/fiq_c_isr.h | 2 +
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arch/arm/mach-s3c2440/mach-gta02.c | 17 ++++++++
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include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h | 2 +-
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4 files changed, 67 insertions(+), 10 deletions(-)
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diff --git a/arch/arm/mach-s3c2440/fiq_c_isr.c b/arch/arm/mach-s3c2440/fiq_c_isr.c
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index 12f4527..a71a234 100644
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--- a/arch/arm/mach-s3c2440/fiq_c_isr.c
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+++ b/arch/arm/mach-s3c2440/fiq_c_isr.c
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@@ -18,6 +18,9 @@
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#include <asm/plat-s3c24xx/cpu.h>
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#include <asm/plat-s3c24xx/irq.h>
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+#include <asm/arch/pwm.h>
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+#include <asm/plat-s3c/regs-timer.h>
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+
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/*
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* Major Caveats for using FIQ
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* ---------------------------
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@@ -66,6 +69,10 @@ static u8 u8aFiqStack[4096];
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u32 _fiq_ack_mask; /* used by isr exit define */
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unsigned long _fiq_count_fiqs; /* used by isr exit define */
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static int _fiq_irq; /* private ; irq index we were started with, or 0 */
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+struct s3c2410_pwm pwm_timer_fiq;
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+int _fiq_timer_index;
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+u16 _fiq_timer_divisor;
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+
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/* this function must live in the monolithic kernel somewhere! A module is
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* NOT good enough!
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@@ -110,23 +117,45 @@ static struct attribute_group s3c2440_fiq_attr_group = {
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* you still need to clear the source interrupt in S3C2410_INTMSK to get
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* anything good happening
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*/
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-static void fiq_init_irq_source(int irq_index_fiq)
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+static int fiq_init_irq_source(int irq_index_fiq)
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{
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+ int rc = 0;
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+
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if (!irq_index_fiq) /* no interrupt */
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- return;
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+ goto bail;
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- printk(KERN_INFO"Enabling FIQ using int idx %d\n",
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- irq_index_fiq - S3C2410_CPUIRQ_OFFSET);
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local_fiq_disable();
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_fiq_irq = irq_index_fiq;
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_fiq_ack_mask = 1 << (irq_index_fiq - S3C2410_CPUIRQ_OFFSET);
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+ timer_index = (irq_index_fiq - IRQ_TIMER0);
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+
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+ /* set up the timer to operate as a pwm device */
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+
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+ rc = s3c2410_pwm_init(&pwm_timer_fiq);
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+ if (rc)
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+ goto bail;
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+
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+ pwm_timer_fiq.timerid = PWM0 + timer_index;
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+ pwm_timer_fiq.prescaler = (6 - 1) / 2;
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+ pwm_timer_fiq.divider = S3C2410_TCFG1_MUX3_DIV2;
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+ /* default rate == ~32us */
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+ pwm_timer_fiq.counter = pwm_timer_fiq.comparer =
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+ timer_divisor = 64;
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+
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+ rc = s3c2410_pwm_enable(&pwm_timer_fiq);
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+ if (rc)
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+ goto bail;
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+
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+ s3c2410_pwm_start(&pwm_timer_fiq);
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/* let our selected interrupt be a magic FIQ interrupt */
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__raw_writel(_fiq_ack_mask, S3C2410_INTMOD);
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/* it's ready to go as soon as we unmask the source in S3C2410_INTMSK */
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local_fiq_enable();
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+bail:
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+ return rc;
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}
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@@ -139,15 +168,13 @@ static void fiq_disable_irq_source(void)
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_fiq_irq = 0; /* no active source interrupt now either */
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}
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-/* this starts FIQ timer events... they continue until the FIQ ISR sees that
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- * its work is done and it turns off the timer. After setting up the fiq_ipc
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- * struct with new work, you call this to start FIQ timer actions up again.
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- * Only the FIQ ISR decides when it is done and controls turning off the
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- * timer events.
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+/*
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+ * fiq_kick() forces a FIQ event to happen shortly after leaving the routine
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*/
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void fiq_kick(void)
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{
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unsigned long flags;
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+ u32 tcon;
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/* we have to take care about FIQ because this modification is
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* non-atomic, FIQ could come in after the read and before the
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@@ -156,15 +183,24 @@ void fiq_kick(void)
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*/
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local_save_flags(flags);
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local_fiq_disable();
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+ /* allow FIQs to resume */
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__raw_writel(__raw_readl(S3C2410_INTMSK) &
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~(1 << (_fiq_irq - S3C2410_CPUIRQ_OFFSET)),
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S3C2410_INTMSK);
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+ tcon = __raw_readl(S3C2410_TCON) & ~S3C2410_TCON_T3START;
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+ /* fake the timer to a count of 1 */
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+ __raw_writel(1, S3C2410_TCNTB(timer_index));
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+ __raw_writel(tcon | S3C2410_TCON_T3MANUALUPD, S3C2410_TCON);
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+ __raw_writel(tcon | S3C2410_TCON_T3MANUALUPD | S3C2410_TCON_T3START,
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+ S3C2410_TCON);
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+ __raw_writel(tcon | S3C2410_TCON_T3START, S3C2410_TCON);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL_GPL(fiq_kick);
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+
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static int __init sc32440_fiq_probe(struct platform_device *pdev)
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{
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struct resource *r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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@@ -172,6 +208,8 @@ static int __init sc32440_fiq_probe(struct platform_device *pdev)
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if (!r)
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return -EIO;
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/* configure for the interrupt we are meant to use */
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+ printk(KERN_INFO"Enabling FIQ using irq %d\n", r->start);
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+
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fiq_init_irq_source(r->start);
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return sysfs_create_group(&pdev->dev.kobj, &s3c2440_fiq_attr_group);
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diff --git a/arch/arm/mach-s3c2440/fiq_c_isr.h b/arch/arm/mach-s3c2440/fiq_c_isr.h
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index f08740e..0c45eb7 100644
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--- a/arch/arm/mach-s3c2440/fiq_c_isr.h
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+++ b/arch/arm/mach-s3c2440/fiq_c_isr.h
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@@ -5,6 +5,8 @@
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extern unsigned long _fiq_count_fiqs;
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extern u32 _fiq_ack_mask;
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+extern int _fiq_timer_index;
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+extern u16 _fiq_timer_divisor;
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/* This CANNOT be implemented in a module -- it has to be used in code
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* included in the monolithic kernel
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diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
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index 0bdd0e0..cb839b2 100644
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--- a/arch/arm/mach-s3c2440/mach-gta02.c
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+++ b/arch/arm/mach-s3c2440/mach-gta02.c
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@@ -57,6 +57,7 @@
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#include <asm/irq.h>
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#include <asm/mach-types.h>
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+#include <asm/arch-s3c2410/regs-irq.h>
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#include <asm/arch/regs-gpio.h>
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#include <asm/arch/regs-gpioj.h>
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#include <asm/arch/fb.h>
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@@ -336,6 +337,21 @@ struct platform_device gta02_pmu_dev = {
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},
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};
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+/* FIQ */
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+
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+static struct resource sc32440_fiq_resources[] = {
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+ [0] = {
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+ .flags = IORESOURCE_IRQ,
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+ .start = IRQ_TIMER3,
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+ .end = IRQ_TIMER3,
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+ },
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+};
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+
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+struct platform_device sc32440_fiq_device = {
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+ .name = "sc32440_fiq",
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+ .num_resources = 1,
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+ .resource = sc32440_fiq_resources,
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+};
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/* NOR Flash */
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@@ -403,6 +419,7 @@ static struct platform_device *gta02_devices[] __initdata = {
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&s3c_device_nand,
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&s3c_device_ts,
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>a02_nor_flash,
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+ &sc32440_fiq_device,
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};
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static struct s3c2410_nand_set gta02_nand_sets[] = {
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diff --git a/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
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index 341f2bb..6cbd8e4 100644
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--- a/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
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+++ b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
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@@ -22,7 +22,7 @@ struct fiq_ipc {
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/* actual definition lives in arch/arm/mach-s3c2440/fiq_c_isr.c */
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extern struct fiq_ipc fiq_ipc;
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-
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+extern unsigned long _fiq_count_fiqs;
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extern void fiq_kick(void); /* provoke a FIQ "immediately" */
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#endif /* _LINUX_FIQ_IPC_H */
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--
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1.5.6.3
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