1da177e4c3
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!
272 lines
6.0 KiB
C
272 lines
6.0 KiB
C
/*
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* linux/arch/arm/mach-integrator/core.c
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*
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* Copyright (C) 2000-2003 Deep Blue Solutions Ltd
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2, as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <asm/hardware.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/hardware/amba.h>
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#include <asm/arch/cm.h>
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#include <asm/system.h>
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#include <asm/leds.h>
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#include <asm/mach/time.h>
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#include "common.h"
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static struct amba_device rtc_device = {
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.dev = {
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.bus_id = "mb:15",
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},
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.res = {
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.start = INTEGRATOR_RTC_BASE,
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.end = INTEGRATOR_RTC_BASE + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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.irq = { IRQ_RTCINT, NO_IRQ },
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.periphid = 0x00041030,
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};
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static struct amba_device uart0_device = {
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.dev = {
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.bus_id = "mb:16",
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},
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.res = {
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.start = INTEGRATOR_UART0_BASE,
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.end = INTEGRATOR_UART0_BASE + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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.irq = { IRQ_UARTINT0, NO_IRQ },
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.periphid = 0x0041010,
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};
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static struct amba_device uart1_device = {
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.dev = {
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.bus_id = "mb:17",
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},
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.res = {
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.start = INTEGRATOR_UART1_BASE,
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.end = INTEGRATOR_UART1_BASE + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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.irq = { IRQ_UARTINT1, NO_IRQ },
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.periphid = 0x0041010,
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};
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static struct amba_device kmi0_device = {
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.dev = {
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.bus_id = "mb:18",
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},
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.res = {
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.start = KMI0_BASE,
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.end = KMI0_BASE + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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.irq = { IRQ_KMIINT0, NO_IRQ },
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.periphid = 0x00041050,
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};
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static struct amba_device kmi1_device = {
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.dev = {
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.bus_id = "mb:19",
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},
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.res = {
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.start = KMI1_BASE,
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.end = KMI1_BASE + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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.irq = { IRQ_KMIINT1, NO_IRQ },
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.periphid = 0x00041050,
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};
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static struct amba_device *amba_devs[] __initdata = {
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&rtc_device,
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&uart0_device,
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&uart1_device,
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&kmi0_device,
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&kmi1_device,
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};
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static int __init integrator_init(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
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struct amba_device *d = amba_devs[i];
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amba_device_register(d, &iomem_resource);
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}
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return 0;
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}
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arch_initcall(integrator_init);
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#define CM_CTRL IO_ADDRESS(INTEGRATOR_HDR_BASE) + INTEGRATOR_HDR_CTRL_OFFSET
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static DEFINE_SPINLOCK(cm_lock);
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/**
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* cm_control - update the CM_CTRL register.
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* @mask: bits to change
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* @set: bits to set
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*/
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void cm_control(u32 mask, u32 set)
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{
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unsigned long flags;
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u32 val;
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spin_lock_irqsave(&cm_lock, flags);
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val = readl(CM_CTRL) & ~mask;
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writel(val | set, CM_CTRL);
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spin_unlock_irqrestore(&cm_lock, flags);
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}
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EXPORT_SYMBOL(cm_control);
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/*
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* Where is the timer (VA)?
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*/
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#define TIMER0_VA_BASE (IO_ADDRESS(INTEGRATOR_CT_BASE)+0x00000000)
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#define TIMER1_VA_BASE (IO_ADDRESS(INTEGRATOR_CT_BASE)+0x00000100)
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#define TIMER2_VA_BASE (IO_ADDRESS(INTEGRATOR_CT_BASE)+0x00000200)
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#define VA_IC_BASE IO_ADDRESS(INTEGRATOR_IC_BASE)
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/*
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* How long is the timer interval?
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*/
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#define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_10)
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#if TIMER_INTERVAL >= 0x100000
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#define TICKS2USECS(x) (256 * (x) / TICKS_PER_uSEC)
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#elif TIMER_INTERVAL >= 0x10000
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#define TICKS2USECS(x) (16 * (x) / TICKS_PER_uSEC)
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#else
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#define TICKS2USECS(x) ((x) / TICKS_PER_uSEC)
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#endif
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/*
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* What does it look like?
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*/
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typedef struct TimerStruct {
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unsigned long TimerLoad;
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unsigned long TimerValue;
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unsigned long TimerControl;
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unsigned long TimerClear;
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} TimerStruct_t;
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static unsigned long timer_reload;
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/*
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* Returns number of ms since last clock interrupt. Note that interrupts
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* will have been disabled by do_gettimeoffset()
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*/
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unsigned long integrator_gettimeoffset(void)
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{
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volatile TimerStruct_t *timer1 = (TimerStruct_t *)TIMER1_VA_BASE;
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unsigned long ticks1, ticks2, status;
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/*
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* Get the current number of ticks. Note that there is a race
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* condition between us reading the timer and checking for
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* an interrupt. We get around this by ensuring that the
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* counter has not reloaded between our two reads.
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*/
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ticks2 = timer1->TimerValue & 0xffff;
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do {
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ticks1 = ticks2;
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status = __raw_readl(VA_IC_BASE + IRQ_RAW_STATUS);
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ticks2 = timer1->TimerValue & 0xffff;
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} while (ticks2 > ticks1);
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/*
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* Number of ticks since last interrupt.
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*/
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ticks1 = timer_reload - ticks2;
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/*
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* Interrupt pending? If so, we've reloaded once already.
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*/
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if (status & (1 << IRQ_TIMERINT1))
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ticks1 += timer_reload;
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/*
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* Convert the ticks to usecs
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*/
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return TICKS2USECS(ticks1);
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}
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/*
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* IRQ handler for the timer
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*/
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static irqreturn_t
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integrator_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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volatile TimerStruct_t *timer1 = (volatile TimerStruct_t *)TIMER1_VA_BASE;
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write_seqlock(&xtime_lock);
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// ...clear the interrupt
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timer1->TimerClear = 1;
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timer_tick(regs);
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write_sequnlock(&xtime_lock);
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return IRQ_HANDLED;
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}
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static struct irqaction integrator_timer_irq = {
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.name = "Integrator Timer Tick",
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.flags = SA_INTERRUPT,
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.handler = integrator_timer_interrupt
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};
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/*
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* Set up timer interrupt, and return the current time in seconds.
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*/
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void __init integrator_time_init(unsigned long reload, unsigned int ctrl)
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{
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volatile TimerStruct_t *timer0 = (volatile TimerStruct_t *)TIMER0_VA_BASE;
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volatile TimerStruct_t *timer1 = (volatile TimerStruct_t *)TIMER1_VA_BASE;
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volatile TimerStruct_t *timer2 = (volatile TimerStruct_t *)TIMER2_VA_BASE;
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unsigned int timer_ctrl = 0x80 | 0x40; /* periodic */
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timer_reload = reload;
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timer_ctrl |= ctrl;
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if (timer_reload > 0x100000) {
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timer_reload >>= 8;
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timer_ctrl |= 0x08; /* /256 */
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} else if (timer_reload > 0x010000) {
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timer_reload >>= 4;
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timer_ctrl |= 0x04; /* /16 */
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}
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/*
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* Initialise to a known state (all timers off)
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*/
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timer0->TimerControl = 0;
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timer1->TimerControl = 0;
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timer2->TimerControl = 0;
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timer1->TimerLoad = timer_reload;
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timer1->TimerValue = timer_reload;
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timer1->TimerControl = timer_ctrl;
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/*
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* Make irqs happen for the system timer
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*/
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setup_irq(IRQ_TIMERINT1, &integrator_timer_irq);
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}
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