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/* sun4c_irq.c
* arch/sparc/kernel/sun4c_irq.c:
*
* djhr: Hacked out of irq.c into a CPU dependent version.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
* Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com)
* Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
*/
#include <linux/config.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/psr.h>
#include <asm/vaddrs.h>
#include <asm/timer.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/traps.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/sun4paddr.h>
#include <asm/idprom.h>
#include <asm/machines.h>
#if 0
static struct resource sun4c_timer_eb = { "sun4c_timer" };
static struct resource sun4c_intr_eb = { "sun4c_intr" };
#endif
/* Pointer to the interrupt enable byte
*
* Dave Redman (djhr@tadpole.co.uk)
* What you may not be aware of is that entry.S requires this variable.
*
* --- linux_trap_nmi_sun4c --
*
* so don't go making it static, like I tried. sigh.
*/
unsigned char *interrupt_enable = 0;
static void sun4c_disable_irq(unsigned int irq_nr)
{
unsigned long flags;
unsigned char current_mask, new_mask;
save_and_cli(flags);
irq_nr &= NR_IRQS;
current_mask = *interrupt_enable;
switch(irq_nr) {
case 1:
new_mask = ((current_mask) & (~(SUN4C_INT_E1)));
break;
case 8:
new_mask = ((current_mask) & (~(SUN4C_INT_E8)));
break;
case 10:
new_mask = ((current_mask) & (~(SUN4C_INT_E10)));
break;
case 14:
new_mask = ((current_mask) & (~(SUN4C_INT_E14)));
break;
default:
restore_flags(flags);
return;
}
*interrupt_enable = new_mask;
restore_flags(flags);
}
static void sun4c_enable_irq(unsigned int irq_nr)
{
unsigned long flags;
unsigned char current_mask, new_mask;
save_and_cli(flags);
irq_nr &= NR_IRQS;
current_mask = *interrupt_enable;
switch(irq_nr) {
case 1:
new_mask = ((current_mask) | SUN4C_INT_E1);
break;
case 8:
new_mask = ((current_mask) | SUN4C_INT_E8);
break;
case 10:
new_mask = ((current_mask) | SUN4C_INT_E10);
break;
case 14:
new_mask = ((current_mask) | SUN4C_INT_E14);
break;
default:
restore_flags(flags);
return;
}
*interrupt_enable = new_mask;
restore_flags(flags);
}
#define TIMER_IRQ 10 /* Also at level 14, but we ignore that one. */
#define PROFILE_IRQ 14 /* Level14 ticker.. used by OBP for polling */
volatile struct sun4c_timer_info *sun4c_timers;
#ifdef CONFIG_SUN4
/* This is an ugly hack to work around the
current timer code, and make it work with
the sun4/260 intersil
*/
volatile struct sun4c_timer_info sun4_timer;
#endif
static void sun4c_clear_clock_irq(void)
{
volatile unsigned int clear_intr;
#ifdef CONFIG_SUN4
if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
clear_intr = sun4_timer.timer_limit10;
else
#endif
clear_intr = sun4c_timers->timer_limit10;
}
static void sun4c_clear_profile_irq(int cpu)
{
/* Errm.. not sure how to do this.. */
}
static void sun4c_load_profile_irq(int cpu, unsigned int limit)
{
/* Errm.. not sure how to do this.. */
}
static void __init sun4c_init_timers(void (*counter_fn)(int, void *, struct pt_regs *))
{
int irq;
/* Map the Timer chip, this is implemented in hardware inside
* the cache chip on the sun4c.
*/
#ifdef CONFIG_SUN4
if (idprom->id_machtype == (SM_SUN4 | SM_4_260))
sun4c_timers = &sun4_timer;
else
#endif
sun4c_timers = ioremap(SUN_TIMER_PHYSADDR,
sizeof(struct sun4c_timer_info));
/* Have the level 10 timer tick at 100HZ. We don't touch the
* level 14 timer limit since we are letting the prom handle
* them until we have a real console driver so L1-A works.
*/
sun4c_timers->timer_limit10 = (((1000000/HZ) + 1) << 10);
master_l10_counter = &sun4c_timers->cur_count10;
master_l10_limit = &sun4c_timers->timer_limit10;
irq = request_irq(TIMER_IRQ,
counter_fn,
(SA_INTERRUPT | SA_STATIC_ALLOC),
"timer", NULL);
if (irq) {
prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
prom_halt();
}
#if 0
/* This does not work on 4/330 */
sun4c_enable_irq(10);
#endif
claim_ticker14(NULL, PROFILE_IRQ, 0);
}
#ifdef CONFIG_SMP
static void sun4c_nop(void) {}
#endif
extern char *sun4m_irq_itoa(unsigned int irq);
void __init sun4c_init_IRQ(void)
{
struct linux_prom_registers int_regs[2];
int ie_node;
if (ARCH_SUN4) {
interrupt_enable = (char *)
ioremap(sun4_ie_physaddr, PAGE_SIZE);
} else {
struct resource phyres;
ie_node = prom_searchsiblings (prom_getchild(prom_root_node),
"interrupt-enable");
if(ie_node == 0)
panic("Cannot find /interrupt-enable node");
/* Depending on the "address" property is bad news... */
prom_getproperty(ie_node, "reg", (char *) int_regs, sizeof(int_regs));
memset(&phyres, 0, sizeof(struct resource));
phyres.flags = int_regs[0].which_io;
phyres.start = int_regs[0].phys_addr;
interrupt_enable = (char *) sbus_ioremap(&phyres, 0,
int_regs[0].reg_size, "sun4c_intr");
}
BTFIXUPSET_CALL(enable_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(disable_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(enable_pil_irq, sun4c_enable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(disable_pil_irq, sun4c_disable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(clear_clock_irq, sun4c_clear_clock_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(clear_profile_irq, sun4c_clear_profile_irq, BTFIXUPCALL_NOP);
BTFIXUPSET_CALL(load_profile_irq, sun4c_load_profile_irq, BTFIXUPCALL_NOP);
BTFIXUPSET_CALL(__irq_itoa, sun4m_irq_itoa, BTFIXUPCALL_NORM);
init_timers = sun4c_init_timers;
#ifdef CONFIG_SMP
BTFIXUPSET_CALL(set_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
BTFIXUPSET_CALL(clear_cpu_int, sun4c_nop, BTFIXUPCALL_NOP);
BTFIXUPSET_CALL(set_irq_udt, sun4c_nop, BTFIXUPCALL_NOP);
#endif
*interrupt_enable = (SUN4C_INT_ENABLE);
/* Cannot enable interrupts until OBP ticker is disabled. */
}
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