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/*
* 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.
*
* arch/sh64/kernel/irq_intc.c
*
* Copyright (C) 2000, 2001 Paolo Alberelli
* Copyright (C) 2003 Paul Mundt
*
* Interrupt Controller support for SH5 INTC.
* Per-interrupt selective. IRLM=0 (Fixed priority) is not
* supported being useless without a cascaded interrupt
* controller.
*
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/bitops.h> /* this includes also <asm/registers.h */
/* which is required to remap register */
/* names used into __asm__ blocks... */
#include <asm/hardware.h>
#include <asm/platform.h>
#include <asm/page.h>
#include <asm/io.h>
#include <asm/irq.h>
/*
* Maybe the generic Peripheral block could move to a more
* generic include file. INTC Block will be defined here
* and only here to make INTC self-contained in a single
* file.
*/
#define INTC_BLOCK_OFFSET 0x01000000
/* Base */
#define INTC_BASE PHYS_PERIPHERAL_BLOCK + \
INTC_BLOCK_OFFSET
/* Address */
#define INTC_ICR_SET (intc_virt + 0x0)
#define INTC_ICR_CLEAR (intc_virt + 0x8)
#define INTC_INTPRI_0 (intc_virt + 0x10)
#define INTC_INTSRC_0 (intc_virt + 0x50)
#define INTC_INTSRC_1 (intc_virt + 0x58)
#define INTC_INTREQ_0 (intc_virt + 0x60)
#define INTC_INTREQ_1 (intc_virt + 0x68)
#define INTC_INTENB_0 (intc_virt + 0x70)
#define INTC_INTENB_1 (intc_virt + 0x78)
#define INTC_INTDSB_0 (intc_virt + 0x80)
#define INTC_INTDSB_1 (intc_virt + 0x88)
#define INTC_ICR_IRLM 0x1
#define INTC_INTPRI_PREGS 8 /* 8 Priority Registers */
#define INTC_INTPRI_PPREG 8 /* 8 Priorities per Register */
/*
* Mapper between the vector ordinal and the IRQ number
* passed to kernel/device drivers.
*/
int intc_evt_to_irq[(0xE20/0x20)+1] = {
-1, -1, -1, -1, -1, -1, -1, -1, /* 0x000 - 0x0E0 */
-1, -1, -1, -1, -1, -1, -1, -1, /* 0x100 - 0x1E0 */
0, 0, 0, 0, 0, 1, 0, 0, /* 0x200 - 0x2E0 */
2, 0, 0, 3, 0, 0, 0, -1, /* 0x300 - 0x3E0 */
32, 33, 34, 35, 36, 37, 38, -1, /* 0x400 - 0x4E0 */
-1, -1, -1, 63, -1, -1, -1, -1, /* 0x500 - 0x5E0 */
-1, -1, 18, 19, 20, 21, 22, -1, /* 0x600 - 0x6E0 */
39, 40, 41, 42, -1, -1, -1, -1, /* 0x700 - 0x7E0 */
4, 5, 6, 7, -1, -1, -1, -1, /* 0x800 - 0x8E0 */
-1, -1, -1, -1, -1, -1, -1, -1, /* 0x900 - 0x9E0 */
12, 13, 14, 15, 16, 17, -1, -1, /* 0xA00 - 0xAE0 */
-1, -1, -1, -1, -1, -1, -1, -1, /* 0xB00 - 0xBE0 */
-1, -1, -1, -1, -1, -1, -1, -1, /* 0xC00 - 0xCE0 */
-1, -1, -1, -1, -1, -1, -1, -1, /* 0xD00 - 0xDE0 */
-1, -1 /* 0xE00 - 0xE20 */
};
/*
* Opposite mapper.
*/
static int IRQ_to_vectorN[NR_INTC_IRQS] = {
0x12, 0x15, 0x18, 0x1B, 0x40, 0x41, 0x42, 0x43, /* 0- 7 */
-1, -1, -1, -1, 0x50, 0x51, 0x52, 0x53, /* 8-15 */
0x54, 0x55, 0x32, 0x33, 0x34, 0x35, 0x36, -1, /* 16-23 */
-1, -1, -1, -1, -1, -1, -1, -1, /* 24-31 */
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x38, /* 32-39 */
0x39, 0x3A, 0x3B, -1, -1, -1, -1, -1, /* 40-47 */
-1, -1, -1, -1, -1, -1, -1, -1, /* 48-55 */
-1, -1, -1, -1, -1, -1, -1, 0x2B, /* 56-63 */
};
static unsigned long intc_virt;
static unsigned int startup_intc_irq(unsigned int irq);
static void shutdown_intc_irq(unsigned int irq);
static void enable_intc_irq(unsigned int irq);
static void disable_intc_irq(unsigned int irq);
static void mask_and_ack_intc(unsigned int);
static void end_intc_irq(unsigned int irq);
static struct hw_interrupt_type intc_irq_type = {
"INTC",
startup_intc_irq,
shutdown_intc_irq,
enable_intc_irq,
disable_intc_irq,
mask_and_ack_intc,
end_intc_irq
};
static int irlm; /* IRL mode */
static unsigned int startup_intc_irq(unsigned int irq)
{
enable_intc_irq(irq);
return 0; /* never anything pending */
}
static void shutdown_intc_irq(unsigned int irq)
{
disable_intc_irq(irq);
}
static void enable_intc_irq(unsigned int irq)
{
unsigned long reg;
unsigned long bitmask;
if ((irq <= IRQ_IRL3) && (irlm == NO_PRIORITY))
printk("Trying to use straight IRL0-3 with an encoding platform.\n");
if (irq < 32) {
reg = INTC_INTENB_0;
bitmask = 1 << irq;
} else {
reg = INTC_INTENB_1;
bitmask = 1 << (irq - 32);
}
ctrl_outl(bitmask, reg);
}
static void disable_intc_irq(unsigned int irq)
{
unsigned long reg;
unsigned long bitmask;
if (irq < 32) {
reg = INTC_INTDSB_0;
bitmask = 1 << irq;
} else {
reg = INTC_INTDSB_1;
bitmask = 1 << (irq - 32);
}
ctrl_outl(bitmask, reg);
}
static void mask_and_ack_intc(unsigned int irq)
{
disable_intc_irq(irq);
}
static void end_intc_irq(unsigned int irq)
{
enable_intc_irq(irq);
}
/* For future use, if we ever support IRLM=0) */
void make_intc_irq(unsigned int irq)
{
disable_irq_nosync(irq);
irq_desc[irq].handler = &intc_irq_type;
disable_intc_irq(irq);
}
#if defined(CONFIG_PROC_FS) && defined(CONFIG_SYSCTL)
int intc_irq_describe(char* p, int irq)
{
if (irq < NR_INTC_IRQS)
return sprintf(p, "(0x%3x)", IRQ_to_vectorN[irq]*0x20);
else
return 0;
}
#endif
void __init init_IRQ(void)
{
unsigned long long __dummy0, __dummy1=~0x00000000100000f0;
unsigned long reg;
unsigned long data;
int i;
intc_virt = onchip_remap(INTC_BASE, 1024, "INTC");
if (!intc_virt) {
panic("Unable to remap INTC\n");
}
/* Set default: per-line enable/disable, priority driven ack/eoi */
for (i = 0; i < NR_INTC_IRQS; i++) {
if (platform_int_priority[i] != NO_PRIORITY) {
irq_desc[i].handler = &intc_irq_type;
}
}
/* Disable all interrupts and set all priorities to 0 to avoid trouble */
ctrl_outl(-1, INTC_INTDSB_0);
ctrl_outl(-1, INTC_INTDSB_1);
for (reg = INTC_INTPRI_0, i = 0; i < INTC_INTPRI_PREGS; i++, reg += 8)
ctrl_outl( NO_PRIORITY, reg);
/* Set IRLM */
/* If all the priorities are set to 'no priority', then
* assume we are using encoded mode.
*/
irlm = platform_int_priority[IRQ_IRL0] + platform_int_priority[IRQ_IRL1] + \
platform_int_priority[IRQ_IRL2] + platform_int_priority[IRQ_IRL3];
if (irlm == NO_PRIORITY) {
/* IRLM = 0 */
reg = INTC_ICR_CLEAR;
i = IRQ_INTA;
printk("Trying to use encoded IRL0-3. IRLs unsupported.\n");
} else {
/* IRLM = 1 */
reg = INTC_ICR_SET;
i = IRQ_IRL0;
}
ctrl_outl(INTC_ICR_IRLM, reg);
/* Set interrupt priorities according to platform description */
for (data = 0, reg = INTC_INTPRI_0; i < NR_INTC_IRQS; i++) {
data |= platform_int_priority[i] << ((i % INTC_INTPRI_PPREG) * 4);
if ((i % INTC_INTPRI_PPREG) == (INTC_INTPRI_PPREG - 1)) {
/* Upon the 7th, set Priority Register */
ctrl_outl(data, reg);
data = 0;
reg += 8;
}
}
#ifdef CONFIG_SH_CAYMAN
{
extern void init_cayman_irq(void);
init_cayman_irq();
}
#endif
/*
* And now let interrupts come in.
* sti() is not enough, we need to
* lower priority, too.
*/
__asm__ __volatile__("getcon " __SR ", %0\n\t"
"and %0, %1, %0\n\t"
"putcon %0, " __SR "\n\t"
: "=&r" (__dummy0)
: "r" (__dummy1));
}
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