285 lines
6.1 KiB
C
285 lines
6.1 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/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/dma-mapping.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/sizes.h>
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#include <asm/mach/flash.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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#include "core.h"
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#include "clock.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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{
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.virtual = VIO_APB_BASE,
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.pfn = __phys_to_pfn(PIO_APB_BASE),
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.length = IO_APB_LENGTH,
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.type = MT_DEVICE
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}, {
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.virtual = VIO_AHB_BASE,
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.pfn = __phys_to_pfn(PIO_AHB_BASE),
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.length = IO_AHB_LENGTH,
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.type = MT_DEVICE
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}
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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)
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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();
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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 = IRQF_DISABLED | IRQF_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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static struct clcd_panel mach_clcd_panel;
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static int aaec2000_clcd_setup(struct clcd_fb *fb)
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{
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dma_addr_t dma;
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fb->panel = &mach_clcd_panel;
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fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, SZ_1M,
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&dma, GFP_KERNEL);
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if (!fb->fb.screen_base) {
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printk(KERN_ERR "CLCD: unable to map framebuffer\n");
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return -ENOMEM;
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}
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fb->fb.fix.smem_start = dma;
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fb->fb.fix.smem_len = SZ_1M;
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return 0;
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}
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static int aaec2000_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
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{
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return dma_mmap_writecombine(&fb->dev->dev, vma,
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fb->fb.screen_base,
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fb->fb.fix.smem_start,
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fb->fb.fix.smem_len);
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}
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static void aaec2000_clcd_remove(struct clcd_fb *fb)
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{
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dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
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fb->fb.screen_base, fb->fb.fix.smem_start);
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}
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static struct clcd_board clcd_plat_data = {
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.name = "AAEC-2000",
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.check = clcdfb_check,
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.decode = clcdfb_decode,
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.setup = aaec2000_clcd_setup,
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.mmap = aaec2000_clcd_mmap,
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.remove = aaec2000_clcd_remove,
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};
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static struct amba_device clcd_device = {
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.dev = {
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.bus_id = "mb:16",
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.coherent_dma_mask = ~0,
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.platform_data = &clcd_plat_data,
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},
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.res = {
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.start = AAEC_CLCD_PHYS,
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.end = AAEC_CLCD_PHYS + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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.irq = { INT_LCD, NO_IRQ },
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.periphid = 0x41110,
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};
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static struct amba_device *amba_devs[] __initdata = {
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&clcd_device,
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};
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static struct clk aaec2000_clcd_clk = {
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.name = "CLCDCLK",
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};
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void __init aaec2000_set_clcd_plat_data(struct aaec2000_clcd_info *clcd)
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{
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clcd_plat_data.enable = clcd->enable;
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clcd_plat_data.disable = clcd->disable;
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memcpy(&mach_clcd_panel, &clcd->panel, sizeof(struct clcd_panel));
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}
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static struct flash_platform_data aaec2000_flash_data = {
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.map_name = "cfi_probe",
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.width = 4,
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};
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static struct resource aaec2000_flash_resource = {
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.start = AAEC_FLASH_BASE,
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.end = AAEC_FLASH_BASE + AAEC_FLASH_SIZE,
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.flags = IORESOURCE_MEM,
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};
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static struct platform_device aaec2000_flash_device = {
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.name = "armflash",
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.id = 0,
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.dev = {
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.platform_data = &aaec2000_flash_data,
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},
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.num_resources = 1,
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.resource = &aaec2000_flash_resource,
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};
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static int __init aaec2000_init(void)
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{
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int i;
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clk_register(&aaec2000_clcd_clk);
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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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platform_device_register(&aaec2000_flash_device);
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return 0;
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};
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arch_initcall(aaec2000_init);
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