158 lines
3.5 KiB
C
158 lines
3.5 KiB
C
/*
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* linux/arch/arm/mach-aaec2000/core.c
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*
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* Code common to all AAEC-2000 machines
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*
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* Copyright (c) 2005 Nicolas Bellido Y Ortega
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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/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/timex.h>
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#include <linux/signal.h>
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#include <asm/hardware.h>
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#include <asm/irq.h>
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#include <asm/mach/irq.h>
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#include <asm/mach/time.h>
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#include <asm/mach/map.h>
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/*
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* Common I/O mapping:
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*
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* Static virtual address mappings are as follow:
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*
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* 0xf8000000-0xf8001ffff: Devices connected to APB bus
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* 0xf8002000-0xf8003ffff: Devices connected to AHB bus
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*
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* Below 0xe8000000 is reserved for vm allocation.
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*
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* The machine specific code must provide the extra mapping beside the
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* default mapping provided here.
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*/
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static struct map_desc standard_io_desc[] __initdata = {
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/* virtual physical length type */
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{ VIO_APB_BASE, PIO_APB_BASE, IO_APB_LENGTH, MT_DEVICE },
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{ VIO_AHB_BASE, PIO_AHB_BASE, IO_AHB_LENGTH, MT_DEVICE }
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};
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void __init aaec2000_map_io(void)
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{
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iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
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}
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/*
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* Interrupt handling routines
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*/
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static void aaec2000_int_ack(unsigned int irq)
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{
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IRQ_INTSR = 1 << irq;
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}
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static void aaec2000_int_mask(unsigned int irq)
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{
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IRQ_INTENC |= (1 << irq);
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}
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static void aaec2000_int_unmask(unsigned int irq)
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{
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IRQ_INTENS |= (1 << irq);
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}
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static struct irqchip aaec2000_irq_chip = {
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.ack = aaec2000_int_ack,
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.mask = aaec2000_int_mask,
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.unmask = aaec2000_int_unmask,
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};
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void __init aaec2000_init_irq(void)
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{
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unsigned int i;
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for (i = 0; i < NR_IRQS; i++) {
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set_irq_handler(i, do_level_IRQ);
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set_irq_chip(i, &aaec2000_irq_chip);
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set_irq_flags(i, IRQF_VALID);
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}
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/* Disable all interrupts */
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IRQ_INTENC = 0xffffffff;
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/* Clear any pending interrupts */
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IRQ_INTSR = IRQ_INTSR;
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}
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/*
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* Time keeping
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*/
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/* IRQs are disabled before entering here from do_gettimeofday() */
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static unsigned long aaec2000_gettimeoffset(void)
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{
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unsigned long ticks_to_match, elapsed, usec;
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/* Get ticks before next timer match */
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ticks_to_match = TIMER1_LOAD - TIMER1_VAL;
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/* We need elapsed ticks since last match */
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elapsed = LATCH - ticks_to_match;
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/* Now, convert them to usec */
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usec = (unsigned long)(elapsed * (tick_nsec / 1000))/LATCH;
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return usec;
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}
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/* We enter here with IRQs enabled */
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static irqreturn_t
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aaec2000_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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/* TODO: Check timer accuracy */
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write_seqlock(&xtime_lock);
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timer_tick(regs);
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TIMER1_CLEAR = 1;
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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 aaec2000_timer_irq = {
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.name = "AAEC-2000 Timer Tick",
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.flags = SA_INTERRUPT | SA_TIMER,
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.handler = aaec2000_timer_interrupt,
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};
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static void __init aaec2000_timer_init(void)
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{
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/* Disable timer 1 */
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TIMER1_CTRL = 0;
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/* We have somehow to generate a 100Hz clock.
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* We then use the 508KHz timer in periodic mode.
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*/
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TIMER1_LOAD = LATCH;
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TIMER1_CLEAR = 1; /* Clear interrupt */
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setup_irq(INT_TMR1_OFL, &aaec2000_timer_irq);
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TIMER1_CTRL = TIMER_CTRL_ENABLE |
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TIMER_CTRL_PERIODIC |
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TIMER_CTRL_CLKSEL_508K;
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}
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struct sys_timer aaec2000_timer = {
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.init = aaec2000_timer_init,
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.offset = aaec2000_gettimeoffset,
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};
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