linux/arch/mips/kernel/irq_txx9.c
Ralf Baechle 49316cbf0a MIPS: Eleminate filenames from comments
They tend to get not updated when files are moved around or copied and
lack any obvious use.  While at it zap some only too obvious comments and
as per Shinya's suggestion, add a copyright header to extable.c.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
2009-08-03 17:52:40 +01:00

191 lines
4.7 KiB
C

/*
* Based on linux/arch/mips/jmr3927/rbhma3100/irq.c,
* linux/arch/mips/tx4927/common/tx4927_irq.c,
* linux/arch/mips/tx4938/common/irq.c
*
* Copyright 2001, 2003-2005 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ahennessy@mvista.com
* source@mvista.com
* Copyright (C) 2000-2001 Toshiba Corporation
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <asm/txx9irq.h>
struct txx9_irc_reg {
u32 cer;
u32 cr[2];
u32 unused0;
u32 ilr[8];
u32 unused1[4];
u32 imr;
u32 unused2[7];
u32 scr;
u32 unused3[7];
u32 ssr;
u32 unused4[7];
u32 csr;
};
/* IRCER : Int. Control Enable */
#define TXx9_IRCER_ICE 0x00000001
/* IRCR : Int. Control */
#define TXx9_IRCR_LOW 0x00000000
#define TXx9_IRCR_HIGH 0x00000001
#define TXx9_IRCR_DOWN 0x00000002
#define TXx9_IRCR_UP 0x00000003
#define TXx9_IRCR_EDGE(cr) ((cr) & 0x00000002)
/* IRSCR : Int. Status Control */
#define TXx9_IRSCR_EIClrE 0x00000100
#define TXx9_IRSCR_EIClr_MASK 0x0000000f
/* IRCSR : Int. Current Status */
#define TXx9_IRCSR_IF 0x00010000
#define TXx9_IRCSR_ILV_MASK 0x00000700
#define TXx9_IRCSR_IVL_MASK 0x0000001f
#define irc_dlevel 0
#define irc_elevel 1
static struct txx9_irc_reg __iomem *txx9_ircptr __read_mostly;
static struct {
unsigned char level;
unsigned char mode;
} txx9irq[TXx9_MAX_IR] __read_mostly;
static void txx9_irq_unmask(unsigned int irq)
{
unsigned int irq_nr = irq - TXX9_IRQ_BASE;
u32 __iomem *ilrp = &txx9_ircptr->ilr[(irq_nr % 16 ) / 2];
int ofs = irq_nr / 16 * 16 + (irq_nr & 1) * 8;
__raw_writel((__raw_readl(ilrp) & ~(0xff << ofs))
| (txx9irq[irq_nr].level << ofs),
ilrp);
#ifdef CONFIG_CPU_TX39XX
/* update IRCSR */
__raw_writel(0, &txx9_ircptr->imr);
__raw_writel(irc_elevel, &txx9_ircptr->imr);
#endif
}
static inline void txx9_irq_mask(unsigned int irq)
{
unsigned int irq_nr = irq - TXX9_IRQ_BASE;
u32 __iomem *ilrp = &txx9_ircptr->ilr[(irq_nr % 16) / 2];
int ofs = irq_nr / 16 * 16 + (irq_nr & 1) * 8;
__raw_writel((__raw_readl(ilrp) & ~(0xff << ofs))
| (irc_dlevel << ofs),
ilrp);
#ifdef CONFIG_CPU_TX39XX
/* update IRCSR */
__raw_writel(0, &txx9_ircptr->imr);
__raw_writel(irc_elevel, &txx9_ircptr->imr);
/* flush write buffer */
__raw_readl(&txx9_ircptr->ssr);
#else
mmiowb();
#endif
}
static void txx9_irq_mask_ack(unsigned int irq)
{
unsigned int irq_nr = irq - TXX9_IRQ_BASE;
txx9_irq_mask(irq);
/* clear edge detection */
if (unlikely(TXx9_IRCR_EDGE(txx9irq[irq_nr].mode)))
__raw_writel(TXx9_IRSCR_EIClrE | irq_nr, &txx9_ircptr->scr);
}
static int txx9_irq_set_type(unsigned int irq, unsigned int flow_type)
{
unsigned int irq_nr = irq - TXX9_IRQ_BASE;
u32 cr;
u32 __iomem *crp;
int ofs;
int mode;
if (flow_type & IRQF_TRIGGER_PROBE)
return 0;
switch (flow_type & IRQF_TRIGGER_MASK) {
case IRQF_TRIGGER_RISING: mode = TXx9_IRCR_UP; break;
case IRQF_TRIGGER_FALLING: mode = TXx9_IRCR_DOWN; break;
case IRQF_TRIGGER_HIGH: mode = TXx9_IRCR_HIGH; break;
case IRQF_TRIGGER_LOW: mode = TXx9_IRCR_LOW; break;
default:
return -EINVAL;
}
crp = &txx9_ircptr->cr[(unsigned int)irq_nr / 8];
cr = __raw_readl(crp);
ofs = (irq_nr & (8 - 1)) * 2;
cr &= ~(0x3 << ofs);
cr |= (mode & 0x3) << ofs;
__raw_writel(cr, crp);
txx9irq[irq_nr].mode = mode;
return 0;
}
static struct irq_chip txx9_irq_chip = {
.name = "TXX9",
.ack = txx9_irq_mask_ack,
.mask = txx9_irq_mask,
.mask_ack = txx9_irq_mask_ack,
.unmask = txx9_irq_unmask,
.set_type = txx9_irq_set_type,
};
void __init txx9_irq_init(unsigned long baseaddr)
{
int i;
txx9_ircptr = ioremap(baseaddr, sizeof(struct txx9_irc_reg));
for (i = 0; i < TXx9_MAX_IR; i++) {
txx9irq[i].level = 4; /* middle level */
txx9irq[i].mode = TXx9_IRCR_LOW;
set_irq_chip_and_handler(TXX9_IRQ_BASE + i,
&txx9_irq_chip, handle_level_irq);
}
/* mask all IRC interrupts */
__raw_writel(0, &txx9_ircptr->imr);
for (i = 0; i < 8; i++)
__raw_writel(0, &txx9_ircptr->ilr[i]);
/* setup IRC interrupt mode (Low Active) */
for (i = 0; i < 2; i++)
__raw_writel(0, &txx9_ircptr->cr[i]);
/* enable interrupt control */
__raw_writel(TXx9_IRCER_ICE, &txx9_ircptr->cer);
__raw_writel(irc_elevel, &txx9_ircptr->imr);
}
int __init txx9_irq_set_pri(int irc_irq, int new_pri)
{
int old_pri;
if ((unsigned int)irc_irq >= TXx9_MAX_IR)
return 0;
old_pri = txx9irq[irc_irq].level;
txx9irq[irc_irq].level = new_pri;
return old_pri;
}
int txx9_irq(void)
{
u32 csr = __raw_readl(&txx9_ircptr->csr);
if (likely(!(csr & TXx9_IRCSR_IF)))
return TXX9_IRQ_BASE + (csr & (TXx9_MAX_IR - 1));
return -1;
}