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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/mach-integrator/core.c
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/mach-integrator/core.c')
-rw-r--r--arch/arm/mach-integrator/core.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/arch/arm/mach-integrator/core.c b/arch/arm/mach-integrator/core.c
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+++ b/arch/arm/mach-integrator/core.c
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+/*
+ * linux/arch/arm/mach-integrator/core.c
+ *
+ * Copyright (C) 2000-2003 Deep Blue Solutions Ltd
+ *
+ * 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.
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/hardware/amba.h>
+#include <asm/arch/cm.h>
+#include <asm/system.h>
+#include <asm/leds.h>
+#include <asm/mach/time.h>
+
+#include "common.h"
+
+static struct amba_device rtc_device = {
+ .dev = {
+ .bus_id = "mb:15",
+ },
+ .res = {
+ .start = INTEGRATOR_RTC_BASE,
+ .end = INTEGRATOR_RTC_BASE + SZ_4K - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ .irq = { IRQ_RTCINT, NO_IRQ },
+ .periphid = 0x00041030,
+};
+
+static struct amba_device uart0_device = {
+ .dev = {
+ .bus_id = "mb:16",
+ },
+ .res = {
+ .start = INTEGRATOR_UART0_BASE,
+ .end = INTEGRATOR_UART0_BASE + SZ_4K - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ .irq = { IRQ_UARTINT0, NO_IRQ },
+ .periphid = 0x0041010,
+};
+
+static struct amba_device uart1_device = {
+ .dev = {
+ .bus_id = "mb:17",
+ },
+ .res = {
+ .start = INTEGRATOR_UART1_BASE,
+ .end = INTEGRATOR_UART1_BASE + SZ_4K - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ .irq = { IRQ_UARTINT1, NO_IRQ },
+ .periphid = 0x0041010,
+};
+
+static struct amba_device kmi0_device = {
+ .dev = {
+ .bus_id = "mb:18",
+ },
+ .res = {
+ .start = KMI0_BASE,
+ .end = KMI0_BASE + SZ_4K - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ .irq = { IRQ_KMIINT0, NO_IRQ },
+ .periphid = 0x00041050,
+};
+
+static struct amba_device kmi1_device = {
+ .dev = {
+ .bus_id = "mb:19",
+ },
+ .res = {
+ .start = KMI1_BASE,
+ .end = KMI1_BASE + SZ_4K - 1,
+ .flags = IORESOURCE_MEM,
+ },
+ .irq = { IRQ_KMIINT1, NO_IRQ },
+ .periphid = 0x00041050,
+};
+
+static struct amba_device *amba_devs[] __initdata = {
+ &rtc_device,
+ &uart0_device,
+ &uart1_device,
+ &kmi0_device,
+ &kmi1_device,
+};
+
+static int __init integrator_init(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
+ struct amba_device *d = amba_devs[i];
+ amba_device_register(d, &iomem_resource);
+ }
+
+ return 0;
+}
+
+arch_initcall(integrator_init);
+
+#define CM_CTRL IO_ADDRESS(INTEGRATOR_HDR_BASE) + INTEGRATOR_HDR_CTRL_OFFSET
+
+static DEFINE_SPINLOCK(cm_lock);
+
+/**
+ * cm_control - update the CM_CTRL register.
+ * @mask: bits to change
+ * @set: bits to set
+ */
+void cm_control(u32 mask, u32 set)
+{
+ unsigned long flags;
+ u32 val;
+
+ spin_lock_irqsave(&cm_lock, flags);
+ val = readl(CM_CTRL) & ~mask;
+ writel(val | set, CM_CTRL);
+ spin_unlock_irqrestore(&cm_lock, flags);
+}
+
+EXPORT_SYMBOL(cm_control);
+
+/*
+ * Where is the timer (VA)?
+ */
+#define TIMER0_VA_BASE (IO_ADDRESS(INTEGRATOR_CT_BASE)+0x00000000)
+#define TIMER1_VA_BASE (IO_ADDRESS(INTEGRATOR_CT_BASE)+0x00000100)
+#define TIMER2_VA_BASE (IO_ADDRESS(INTEGRATOR_CT_BASE)+0x00000200)
+#define VA_IC_BASE IO_ADDRESS(INTEGRATOR_IC_BASE)
+
+/*
+ * How long is the timer interval?
+ */
+#define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_10)
+#if TIMER_INTERVAL >= 0x100000
+#define TICKS2USECS(x) (256 * (x) / TICKS_PER_uSEC)
+#elif TIMER_INTERVAL >= 0x10000
+#define TICKS2USECS(x) (16 * (x) / TICKS_PER_uSEC)
+#else
+#define TICKS2USECS(x) ((x) / TICKS_PER_uSEC)
+#endif
+
+/*
+ * What does it look like?
+ */
+typedef struct TimerStruct {
+ unsigned long TimerLoad;
+ unsigned long TimerValue;
+ unsigned long TimerControl;
+ unsigned long TimerClear;
+} TimerStruct_t;
+
+static unsigned long timer_reload;
+
+/*
+ * Returns number of ms since last clock interrupt. Note that interrupts
+ * will have been disabled by do_gettimeoffset()
+ */
+unsigned long integrator_gettimeoffset(void)
+{
+ volatile TimerStruct_t *timer1 = (TimerStruct_t *)TIMER1_VA_BASE;
+ unsigned long ticks1, ticks2, status;
+
+ /*
+ * Get the current number of ticks. Note that there is a race
+ * condition between us reading the timer and checking for
+ * an interrupt. We get around this by ensuring that the
+ * counter has not reloaded between our two reads.
+ */
+ ticks2 = timer1->TimerValue & 0xffff;
+ do {
+ ticks1 = ticks2;
+ status = __raw_readl(VA_IC_BASE + IRQ_RAW_STATUS);
+ ticks2 = timer1->TimerValue & 0xffff;
+ } while (ticks2 > ticks1);
+
+ /*
+ * Number of ticks since last interrupt.
+ */
+ ticks1 = timer_reload - ticks2;
+
+ /*
+ * Interrupt pending? If so, we've reloaded once already.
+ */
+ if (status & (1 << IRQ_TIMERINT1))
+ ticks1 += timer_reload;
+
+ /*
+ * Convert the ticks to usecs
+ */
+ return TICKS2USECS(ticks1);
+}
+
+/*
+ * IRQ handler for the timer
+ */
+static irqreturn_t
+integrator_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ volatile TimerStruct_t *timer1 = (volatile TimerStruct_t *)TIMER1_VA_BASE;
+
+ write_seqlock(&xtime_lock);
+
+ // ...clear the interrupt
+ timer1->TimerClear = 1;
+
+ timer_tick(regs);
+
+ write_sequnlock(&xtime_lock);
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction integrator_timer_irq = {
+ .name = "Integrator Timer Tick",
+ .flags = SA_INTERRUPT,
+ .handler = integrator_timer_interrupt
+};
+
+/*
+ * Set up timer interrupt, and return the current time in seconds.
+ */
+void __init integrator_time_init(unsigned long reload, unsigned int ctrl)
+{
+ volatile TimerStruct_t *timer0 = (volatile TimerStruct_t *)TIMER0_VA_BASE;
+ volatile TimerStruct_t *timer1 = (volatile TimerStruct_t *)TIMER1_VA_BASE;
+ volatile TimerStruct_t *timer2 = (volatile TimerStruct_t *)TIMER2_VA_BASE;
+ unsigned int timer_ctrl = 0x80 | 0x40; /* periodic */
+
+ timer_reload = reload;
+ timer_ctrl |= ctrl;
+
+ if (timer_reload > 0x100000) {
+ timer_reload >>= 8;
+ timer_ctrl |= 0x08; /* /256 */
+ } else if (timer_reload > 0x010000) {
+ timer_reload >>= 4;
+ timer_ctrl |= 0x04; /* /16 */
+ }
+
+ /*
+ * Initialise to a known state (all timers off)
+ */
+ timer0->TimerControl = 0;
+ timer1->TimerControl = 0;
+ timer2->TimerControl = 0;
+
+ timer1->TimerLoad = timer_reload;
+ timer1->TimerValue = timer_reload;
+ timer1->TimerControl = timer_ctrl;
+
+ /*
+ * Make irqs happen for the system timer
+ */
+ setup_irq(IRQ_TIMERINT1, &integrator_timer_irq);
+}