/*
* linux/arch/mips/kernel/irq_txx9.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;
}
