mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 20:01:55 +00:00
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/* arch/arm/plat-samsung/irq-uart.c
|
|
* originally part of arch/arm/plat-s3c64xx/irq.c
|
|
*
|
|
* Copyright 2008 Openmoko, Inc.
|
|
* Copyright 2008 Simtec Electronics
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
* http://armlinux.simtec.co.uk/
|
|
*
|
|
* Samsung- UART Interrupt handling
|
|
*
|
|
* 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/kernel.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/serial_core.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <mach/map.h>
|
|
#include <plat/irq-uart.h>
|
|
#include <plat/regs-serial.h>
|
|
#include <plat/cpu.h>
|
|
|
|
/* Note, we make use of the fact that the parent IRQs, IRQ_UART[0..3]
|
|
* are consecutive when looking up the interrupt in the demux routines.
|
|
*/
|
|
|
|
static inline void __iomem *s3c_irq_uart_base(struct irq_data *data)
|
|
{
|
|
struct s3c_uart_irq *uirq = irq_data_get_irq_chip_data(data);
|
|
return uirq->regs;
|
|
}
|
|
|
|
static inline unsigned int s3c_irq_uart_bit(unsigned int irq)
|
|
{
|
|
return irq & 3;
|
|
}
|
|
|
|
static void s3c_irq_uart_mask(struct irq_data *data)
|
|
{
|
|
void __iomem *regs = s3c_irq_uart_base(data);
|
|
unsigned int bit = s3c_irq_uart_bit(data->irq);
|
|
u32 reg;
|
|
|
|
reg = __raw_readl(regs + S3C64XX_UINTM);
|
|
reg |= (1 << bit);
|
|
__raw_writel(reg, regs + S3C64XX_UINTM);
|
|
}
|
|
|
|
static void s3c_irq_uart_maskack(struct irq_data *data)
|
|
{
|
|
void __iomem *regs = s3c_irq_uart_base(data);
|
|
unsigned int bit = s3c_irq_uart_bit(data->irq);
|
|
u32 reg;
|
|
|
|
reg = __raw_readl(regs + S3C64XX_UINTM);
|
|
reg |= (1 << bit);
|
|
__raw_writel(reg, regs + S3C64XX_UINTM);
|
|
__raw_writel(1 << bit, regs + S3C64XX_UINTP);
|
|
}
|
|
|
|
static void s3c_irq_uart_unmask(struct irq_data *data)
|
|
{
|
|
void __iomem *regs = s3c_irq_uart_base(data);
|
|
unsigned int bit = s3c_irq_uart_bit(data->irq);
|
|
u32 reg;
|
|
|
|
reg = __raw_readl(regs + S3C64XX_UINTM);
|
|
reg &= ~(1 << bit);
|
|
__raw_writel(reg, regs + S3C64XX_UINTM);
|
|
}
|
|
|
|
static void s3c_irq_uart_ack(struct irq_data *data)
|
|
{
|
|
void __iomem *regs = s3c_irq_uart_base(data);
|
|
unsigned int bit = s3c_irq_uart_bit(data->irq);
|
|
|
|
__raw_writel(1 << bit, regs + S3C64XX_UINTP);
|
|
}
|
|
|
|
static void s3c_irq_demux_uart(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
struct s3c_uart_irq *uirq = desc->irq_data.handler_data;
|
|
u32 pend = __raw_readl(uirq->regs + S3C64XX_UINTP);
|
|
int base = uirq->base_irq;
|
|
|
|
if (pend & (1 << 0))
|
|
generic_handle_irq(base);
|
|
if (pend & (1 << 1))
|
|
generic_handle_irq(base + 1);
|
|
if (pend & (1 << 2))
|
|
generic_handle_irq(base + 2);
|
|
if (pend & (1 << 3))
|
|
generic_handle_irq(base + 3);
|
|
}
|
|
|
|
static struct irq_chip s3c_irq_uart = {
|
|
.name = "s3c-uart",
|
|
.irq_mask = s3c_irq_uart_mask,
|
|
.irq_unmask = s3c_irq_uart_unmask,
|
|
.irq_mask_ack = s3c_irq_uart_maskack,
|
|
.irq_ack = s3c_irq_uart_ack,
|
|
};
|
|
|
|
static void __init s3c_init_uart_irq(struct s3c_uart_irq *uirq)
|
|
{
|
|
void __iomem *reg_base = uirq->regs;
|
|
unsigned int irq;
|
|
int offs;
|
|
|
|
/* mask all interrupts at the start. */
|
|
__raw_writel(0xf, reg_base + S3C64XX_UINTM);
|
|
|
|
for (offs = 0; offs < 3; offs++) {
|
|
irq = uirq->base_irq + offs;
|
|
|
|
set_irq_chip(irq, &s3c_irq_uart);
|
|
set_irq_chip_data(irq, uirq);
|
|
set_irq_handler(irq, handle_level_irq);
|
|
set_irq_flags(irq, IRQF_VALID);
|
|
}
|
|
|
|
irq_set_handler_data(uirq->parent_irq, uirq);
|
|
irq_set_chained_handler(uirq->parent_irq, s3c_irq_demux_uart);
|
|
}
|
|
|
|
/**
|
|
* s3c_init_uart_irqs() - initialise UART IRQs and the necessary demuxing
|
|
* @irq: The interrupt data for registering
|
|
* @nr_irqs: The number of interrupt descriptions in @irq.
|
|
*
|
|
* Register the UART interrupts specified by @irq including the demuxing
|
|
* routines. This supports the S3C6400 and newer style of devices.
|
|
*/
|
|
void __init s3c_init_uart_irqs(struct s3c_uart_irq *irq, unsigned int nr_irqs)
|
|
{
|
|
for (; nr_irqs > 0; nr_irqs--, irq++)
|
|
s3c_init_uart_irq(irq);
|
|
}
|