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/*
* linux/arch/arm/mach-h720x/common.c
*
* Copyright (C) 2003 Thomas Gleixner <tglx@linutronix.de>
* 2003 Robert Schwebel <r.schwebel@pengutronix.de>
* 2004 Sascha Hauer <s.hauer@pengutronix.de>
*
* common stuff for Hynix h720x processors
*
* 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/sched.h>
#include <linux/mman.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/dma.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/mach/map.h>
#include <mach/irqs.h>
#include <asm/mach/dma.h>
#if 0
#define IRQDBG(args...) printk(args)
#else
#define IRQDBG(args...) do {} while(0)
#endif
void __init arch_dma_init(dma_t *dma)
{
}
/*
* Return usecs since last timer reload
* (timercount * (usecs perjiffie)) / (ticks per jiffie)
*/
unsigned long h720x_gettimeoffset(void)
{
return (CPU_REG (TIMER_VIRT, TM0_COUNT) * tick_usec) / LATCH;
}
/*
* mask Global irq's
*/
static void mask_global_irq (unsigned int irq )
{
CPU_REG (IRQC_VIRT, IRQC_IER) &= ~(1 << irq);
}
/*
* unmask Global irq's
*/
static void unmask_global_irq (unsigned int irq )
{
CPU_REG (IRQC_VIRT, IRQC_IER) |= (1 << irq);
}
/*
* ack GPIO irq's
* Ack only for edge triggered int's valid
*/
static void inline ack_gpio_irq(u32 irq)
{
u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(irq));
u32 bit = IRQ_TO_BIT(irq);
if ( (CPU_REG (reg_base, GPIO_EDGE) & bit))
CPU_REG (reg_base, GPIO_CLR) = bit;
}
/*
* mask GPIO irq's
*/
static void inline mask_gpio_irq(u32 irq)
{
u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(irq));
u32 bit = IRQ_TO_BIT(irq);
CPU_REG (reg_base, GPIO_MASK) &= ~bit;
}
/*
* unmask GPIO irq's
*/
static void inline unmask_gpio_irq(u32 irq)
{
u32 reg_base = GPIO_VIRT(IRQ_TO_REGNO(irq));
u32 bit = IRQ_TO_BIT(irq);
CPU_REG (reg_base, GPIO_MASK) |= bit;
}
static void
h720x_gpio_handler(unsigned int mask, unsigned int irq,
struct irq_desc *desc)
{
IRQDBG("%s irq: %d\n", __func__, irq);
while (mask) {
if (mask & 1) {
IRQDBG("handling irq %d\n", irq);
generic_handle_irq(irq);
}
irq++;
mask >>= 1;
}
}
static void
h720x_gpioa_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
unsigned int mask, irq;
mask = CPU_REG(GPIO_A_VIRT,GPIO_STAT);
irq = IRQ_CHAINED_GPIOA(0);
IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
h720x_gpio_handler(mask, irq, desc);
}
static void
h720x_gpiob_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
unsigned int mask, irq;
mask = CPU_REG(GPIO_B_VIRT,GPIO_STAT);
irq = IRQ_CHAINED_GPIOB(0);
IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
h720x_gpio_handler(mask, irq, desc);
}
static void
h720x_gpioc_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
unsigned int mask, irq;
mask = CPU_REG(GPIO_C_VIRT,GPIO_STAT);
irq = IRQ_CHAINED_GPIOC(0);
IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
h720x_gpio_handler(mask, irq, desc);
}
static void
h720x_gpiod_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
unsigned int mask, irq;
mask = CPU_REG(GPIO_D_VIRT,GPIO_STAT);
irq = IRQ_CHAINED_GPIOD(0);
IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
h720x_gpio_handler(mask, irq, desc);
}
#ifdef CONFIG_CPU_H7202
static void
h720x_gpioe_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
{
unsigned int mask, irq;
mask = CPU_REG(GPIO_E_VIRT,GPIO_STAT);
irq = IRQ_CHAINED_GPIOE(0);
IRQDBG("%s mask: 0x%08x irq: %d\n", __func__, mask,irq);
h720x_gpio_handler(mask, irq, desc);
}
#endif
static struct irq_chip h720x_global_chip = {
.ack = mask_global_irq,
.mask = mask_global_irq,
.unmask = unmask_global_irq,
};
static struct irq_chip h720x_gpio_chip = {
.ack = ack_gpio_irq,
.mask = mask_gpio_irq,
.unmask = unmask_gpio_irq,
};
/*
* Initialize IRQ's, mask all, enable multiplexed irq's
*/
void __init h720x_init_irq (void)
{
int irq;
/* Mask global irq's */
CPU_REG (IRQC_VIRT, IRQC_IER) = 0x0;
/* Mask all multiplexed irq's */
CPU_REG (GPIO_A_VIRT, GPIO_MASK) = 0x0;
CPU_REG (GPIO_B_VIRT, GPIO_MASK) = 0x0;
CPU_REG (GPIO_C_VIRT, GPIO_MASK) = 0x0;
CPU_REG (GPIO_D_VIRT, GPIO_MASK) = 0x0;
/* Initialize global IRQ's, fast path */
for (irq = 0; irq < NR_GLBL_IRQS; irq++) {
set_irq_chip(irq, &h720x_global_chip);
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
}
/* Initialize multiplexed IRQ's, slow path */
for (irq = IRQ_CHAINED_GPIOA(0) ; irq <= IRQ_CHAINED_GPIOD(31); irq++) {
set_irq_chip(irq, &h720x_gpio_chip);
set_irq_handler(irq, handle_edge_irq);
set_irq_flags(irq, IRQF_VALID );
}
set_irq_chained_handler(IRQ_GPIOA, h720x_gpioa_demux_handler);
set_irq_chained_handler(IRQ_GPIOB, h720x_gpiob_demux_handler);
set_irq_chained_handler(IRQ_GPIOC, h720x_gpioc_demux_handler);
set_irq_chained_handler(IRQ_GPIOD, h720x_gpiod_demux_handler);
#ifdef CONFIG_CPU_H7202
for (irq = IRQ_CHAINED_GPIOE(0) ; irq <= IRQ_CHAINED_GPIOE(31); irq++) {
set_irq_chip(irq, &h720x_gpio_chip);
set_irq_handler(irq, handle_edge_irq);
set_irq_flags(irq, IRQF_VALID );
}
set_irq_chained_handler(IRQ_GPIOE, h720x_gpioe_demux_handler);
#endif
/* Enable multiplexed irq's */
CPU_REG (IRQC_VIRT, IRQC_IER) = IRQ_ENA_MUX;
}
static struct map_desc h720x_io_desc[] __initdata = {
{
.virtual = IO_VIRT,
.pfn = __phys_to_pfn(IO_PHYS),
.length = IO_SIZE,
.type = MT_DEVICE
},
};
/* Initialize io tables */
void __init h720x_map_io(void)
{
iotable_init(h720x_io_desc,ARRAY_SIZE(h720x_io_desc));
}
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