519 lines
12 KiB
C
519 lines
12 KiB
C
/*
|
|
* SS1000/SC2000 interrupt handling.
|
|
*
|
|
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
|
|
* Heavily based on arch/sparc/kernel/irq.c.
|
|
*/
|
|
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <asm/timer.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/io.h>
|
|
#include <asm/sbi.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/oplib.h>
|
|
|
|
#include "kernel.h"
|
|
#include "irq.h"
|
|
|
|
/* Sun4d interrupts fall roughly into two categories. SBUS and
|
|
* cpu local. CPU local interrupts cover the timer interrupts
|
|
* and whatnot, and we encode those as normal PILs between
|
|
* 0 and 15.
|
|
* SBUS interrupts are encodes as a combination of board, level and slot.
|
|
*/
|
|
|
|
struct sun4d_handler_data {
|
|
unsigned int cpuid; /* target cpu */
|
|
unsigned int real_irq; /* interrupt level */
|
|
};
|
|
|
|
|
|
static unsigned int sun4d_encode_irq(int board, int lvl, int slot)
|
|
{
|
|
return (board + 1) << 5 | (lvl << 2) | slot;
|
|
}
|
|
|
|
struct sun4d_timer_regs {
|
|
u32 l10_timer_limit;
|
|
u32 l10_cur_countx;
|
|
u32 l10_limit_noclear;
|
|
u32 ctrl;
|
|
u32 l10_cur_count;
|
|
};
|
|
|
|
static struct sun4d_timer_regs __iomem *sun4d_timers;
|
|
|
|
#define SUN4D_TIMER_IRQ 10
|
|
|
|
/* Specify which cpu handle interrupts from which board.
|
|
* Index is board - value is cpu.
|
|
*/
|
|
static unsigned char board_to_cpu[32];
|
|
|
|
static int pil_to_sbus[] = {
|
|
0,
|
|
0,
|
|
1,
|
|
2,
|
|
0,
|
|
3,
|
|
0,
|
|
4,
|
|
0,
|
|
5,
|
|
0,
|
|
6,
|
|
0,
|
|
7,
|
|
0,
|
|
0,
|
|
};
|
|
|
|
/* Exported for sun4d_smp.c */
|
|
DEFINE_SPINLOCK(sun4d_imsk_lock);
|
|
|
|
/* SBUS interrupts are encoded integers including the board number
|
|
* (plus one), the SBUS level, and the SBUS slot number. Sun4D
|
|
* IRQ dispatch is done by:
|
|
*
|
|
* 1) Reading the BW local interrupt table in order to get the bus
|
|
* interrupt mask.
|
|
*
|
|
* This table is indexed by SBUS interrupt level which can be
|
|
* derived from the PIL we got interrupted on.
|
|
*
|
|
* 2) For each bus showing interrupt pending from #1, read the
|
|
* SBI interrupt state register. This will indicate which slots
|
|
* have interrupts pending for that SBUS interrupt level.
|
|
*
|
|
* 3) Call the genreric IRQ support.
|
|
*/
|
|
static void sun4d_sbus_handler_irq(int sbusl)
|
|
{
|
|
unsigned int bus_mask;
|
|
unsigned int sbino, slot;
|
|
unsigned int sbil;
|
|
|
|
bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
|
|
bw_clear_intr_mask(sbusl, bus_mask);
|
|
|
|
sbil = (sbusl << 2);
|
|
/* Loop for each pending SBI */
|
|
for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1) {
|
|
unsigned int idx, mask;
|
|
|
|
if (!(bus_mask & 1))
|
|
continue;
|
|
/* XXX This seems to ACK the irq twice. acquire_sbi()
|
|
* XXX uses swap, therefore this writes 0xf << sbil,
|
|
* XXX then later release_sbi() will write the individual
|
|
* XXX bits which were set again.
|
|
*/
|
|
mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
|
|
mask &= (0xf << sbil);
|
|
|
|
/* Loop for each pending SBI slot */
|
|
slot = (1 << sbil);
|
|
for (idx = 0; mask != 0; idx++, slot <<= 1) {
|
|
unsigned int pil;
|
|
struct irq_bucket *p;
|
|
|
|
if (!(mask & slot))
|
|
continue;
|
|
|
|
mask &= ~slot;
|
|
pil = sun4d_encode_irq(sbino, sbusl, idx);
|
|
|
|
p = irq_map[pil];
|
|
while (p) {
|
|
struct irq_bucket *next;
|
|
|
|
next = p->next;
|
|
generic_handle_irq(p->irq);
|
|
p = next;
|
|
}
|
|
release_sbi(SBI2DEVID(sbino), slot);
|
|
}
|
|
}
|
|
}
|
|
|
|
void sun4d_handler_irq(unsigned int pil, struct pt_regs *regs)
|
|
{
|
|
struct pt_regs *old_regs;
|
|
/* SBUS IRQ level (1 - 7) */
|
|
int sbusl = pil_to_sbus[pil];
|
|
|
|
/* FIXME: Is this necessary?? */
|
|
cc_get_ipen();
|
|
|
|
cc_set_iclr(1 << pil);
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Check IPI data structures after IRQ has been cleared. Hard and Soft
|
|
* IRQ can happen at the same time, so both cases are always handled.
|
|
*/
|
|
if (pil == SUN4D_IPI_IRQ)
|
|
sun4d_ipi_interrupt();
|
|
#endif
|
|
|
|
old_regs = set_irq_regs(regs);
|
|
irq_enter();
|
|
if (sbusl == 0) {
|
|
/* cpu interrupt */
|
|
struct irq_bucket *p;
|
|
|
|
p = irq_map[pil];
|
|
while (p) {
|
|
struct irq_bucket *next;
|
|
|
|
next = p->next;
|
|
generic_handle_irq(p->irq);
|
|
p = next;
|
|
}
|
|
} else {
|
|
/* SBUS interrupt */
|
|
sun4d_sbus_handler_irq(sbusl);
|
|
}
|
|
irq_exit();
|
|
set_irq_regs(old_regs);
|
|
}
|
|
|
|
|
|
static void sun4d_mask_irq(struct irq_data *data)
|
|
{
|
|
struct sun4d_handler_data *handler_data = irq_data_get_irq_handler_data(data);
|
|
unsigned int real_irq;
|
|
#ifdef CONFIG_SMP
|
|
int cpuid = handler_data->cpuid;
|
|
unsigned long flags;
|
|
#endif
|
|
real_irq = handler_data->real_irq;
|
|
#ifdef CONFIG_SMP
|
|
spin_lock_irqsave(&sun4d_imsk_lock, flags);
|
|
cc_set_imsk_other(cpuid, cc_get_imsk_other(cpuid) | (1 << real_irq));
|
|
spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
|
|
#else
|
|
cc_set_imsk(cc_get_imsk() | (1 << real_irq));
|
|
#endif
|
|
}
|
|
|
|
static void sun4d_unmask_irq(struct irq_data *data)
|
|
{
|
|
struct sun4d_handler_data *handler_data = irq_data_get_irq_handler_data(data);
|
|
unsigned int real_irq;
|
|
#ifdef CONFIG_SMP
|
|
int cpuid = handler_data->cpuid;
|
|
unsigned long flags;
|
|
#endif
|
|
real_irq = handler_data->real_irq;
|
|
|
|
#ifdef CONFIG_SMP
|
|
spin_lock_irqsave(&sun4d_imsk_lock, flags);
|
|
cc_set_imsk_other(cpuid, cc_get_imsk_other(cpuid) & ~(1 << real_irq));
|
|
spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
|
|
#else
|
|
cc_set_imsk(cc_get_imsk() & ~(1 << real_irq));
|
|
#endif
|
|
}
|
|
|
|
static unsigned int sun4d_startup_irq(struct irq_data *data)
|
|
{
|
|
irq_link(data->irq);
|
|
sun4d_unmask_irq(data);
|
|
return 0;
|
|
}
|
|
|
|
static void sun4d_shutdown_irq(struct irq_data *data)
|
|
{
|
|
sun4d_mask_irq(data);
|
|
irq_unlink(data->irq);
|
|
}
|
|
|
|
static struct irq_chip sun4d_irq = {
|
|
.name = "sun4d",
|
|
.irq_startup = sun4d_startup_irq,
|
|
.irq_shutdown = sun4d_shutdown_irq,
|
|
.irq_unmask = sun4d_unmask_irq,
|
|
.irq_mask = sun4d_mask_irq,
|
|
};
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* Setup IRQ distribution scheme. */
|
|
void __init sun4d_distribute_irqs(void)
|
|
{
|
|
struct device_node *dp;
|
|
|
|
int cpuid = cpu_logical_map(1);
|
|
|
|
if (cpuid == -1)
|
|
cpuid = cpu_logical_map(0);
|
|
for_each_node_by_name(dp, "sbi") {
|
|
int devid = of_getintprop_default(dp, "device-id", 0);
|
|
int board = of_getintprop_default(dp, "board#", 0);
|
|
board_to_cpu[board] = cpuid;
|
|
set_sbi_tid(devid, cpuid << 3);
|
|
}
|
|
printk(KERN_ERR "All sbus IRQs directed to CPU%d\n", cpuid);
|
|
}
|
|
#endif
|
|
|
|
static void sun4d_clear_clock_irq(void)
|
|
{
|
|
sbus_readl(&sun4d_timers->l10_timer_limit);
|
|
}
|
|
|
|
static void sun4d_load_profile_irq(int cpu, unsigned int limit)
|
|
{
|
|
unsigned int value = limit ? timer_value(limit) : 0;
|
|
bw_set_prof_limit(cpu, value);
|
|
}
|
|
|
|
static void __init sun4d_load_profile_irqs(void)
|
|
{
|
|
int cpu = 0, mid;
|
|
|
|
while (!cpu_find_by_instance(cpu, NULL, &mid)) {
|
|
sun4d_load_profile_irq(mid >> 3, 0);
|
|
cpu++;
|
|
}
|
|
}
|
|
|
|
static unsigned int _sun4d_build_device_irq(unsigned int real_irq,
|
|
unsigned int pil,
|
|
unsigned int board)
|
|
{
|
|
struct sun4d_handler_data *handler_data;
|
|
unsigned int irq;
|
|
|
|
irq = irq_alloc(real_irq, pil);
|
|
if (irq == 0) {
|
|
prom_printf("IRQ: allocate for %d %d %d failed\n",
|
|
real_irq, pil, board);
|
|
goto err_out;
|
|
}
|
|
|
|
handler_data = irq_get_handler_data(irq);
|
|
if (unlikely(handler_data))
|
|
goto err_out;
|
|
|
|
handler_data = kzalloc(sizeof(struct sun4d_handler_data), GFP_ATOMIC);
|
|
if (unlikely(!handler_data)) {
|
|
prom_printf("IRQ: kzalloc(sun4d_handler_data) failed.\n");
|
|
prom_halt();
|
|
}
|
|
handler_data->cpuid = board_to_cpu[board];
|
|
handler_data->real_irq = real_irq;
|
|
irq_set_chip_and_handler_name(irq, &sun4d_irq,
|
|
handle_level_irq, "level");
|
|
irq_set_handler_data(irq, handler_data);
|
|
|
|
err_out:
|
|
return irq;
|
|
}
|
|
|
|
|
|
|
|
static unsigned int sun4d_build_device_irq(struct platform_device *op,
|
|
unsigned int real_irq)
|
|
{
|
|
struct device_node *dp = op->dev.of_node;
|
|
struct device_node *board_parent, *bus = dp->parent;
|
|
char *bus_connection;
|
|
const struct linux_prom_registers *regs;
|
|
unsigned int pil;
|
|
unsigned int irq;
|
|
int board, slot;
|
|
int sbusl;
|
|
|
|
irq = real_irq;
|
|
while (bus) {
|
|
if (!strcmp(bus->name, "sbi")) {
|
|
bus_connection = "io-unit";
|
|
break;
|
|
}
|
|
|
|
if (!strcmp(bus->name, "bootbus")) {
|
|
bus_connection = "cpu-unit";
|
|
break;
|
|
}
|
|
|
|
bus = bus->parent;
|
|
}
|
|
if (!bus)
|
|
goto err_out;
|
|
|
|
regs = of_get_property(dp, "reg", NULL);
|
|
if (!regs)
|
|
goto err_out;
|
|
|
|
slot = regs->which_io;
|
|
|
|
/*
|
|
* If Bus nodes parent is not io-unit/cpu-unit or the io-unit/cpu-unit
|
|
* lacks a "board#" property, something is very wrong.
|
|
*/
|
|
if (!bus->parent || strcmp(bus->parent->name, bus_connection)) {
|
|
printk(KERN_ERR "%s: Error, parent is not %s.\n",
|
|
bus->full_name, bus_connection);
|
|
goto err_out;
|
|
}
|
|
board_parent = bus->parent;
|
|
board = of_getintprop_default(board_parent, "board#", -1);
|
|
if (board == -1) {
|
|
printk(KERN_ERR "%s: Error, lacks board# property.\n",
|
|
board_parent->full_name);
|
|
goto err_out;
|
|
}
|
|
|
|
sbusl = pil_to_sbus[real_irq];
|
|
if (sbusl)
|
|
pil = sun4d_encode_irq(board, sbusl, slot);
|
|
else
|
|
pil = real_irq;
|
|
|
|
irq = _sun4d_build_device_irq(real_irq, pil, board);
|
|
err_out:
|
|
return irq;
|
|
}
|
|
|
|
static unsigned int sun4d_build_timer_irq(unsigned int board,
|
|
unsigned int real_irq)
|
|
{
|
|
return _sun4d_build_device_irq(real_irq, real_irq, board);
|
|
}
|
|
|
|
|
|
static void __init sun4d_fixup_trap_table(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
unsigned long flags;
|
|
struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
|
|
|
|
/* Adjust so that we jump directly to smp4d_ticker */
|
|
lvl14_save[2] += smp4d_ticker - real_irq_entry;
|
|
|
|
/* For SMP we use the level 14 ticker, however the bootup code
|
|
* has copied the firmware's level 14 vector into the boot cpu's
|
|
* trap table, we must fix this now or we get squashed.
|
|
*/
|
|
local_irq_save(flags);
|
|
patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
|
|
trap_table->inst_one = lvl14_save[0];
|
|
trap_table->inst_two = lvl14_save[1];
|
|
trap_table->inst_three = lvl14_save[2];
|
|
trap_table->inst_four = lvl14_save[3];
|
|
local_ops->cache_all();
|
|
local_irq_restore(flags);
|
|
#endif
|
|
}
|
|
|
|
static void __init sun4d_init_timers(void)
|
|
{
|
|
struct device_node *dp;
|
|
struct resource res;
|
|
unsigned int irq;
|
|
const u32 *reg;
|
|
int err;
|
|
int board;
|
|
|
|
dp = of_find_node_by_name(NULL, "cpu-unit");
|
|
if (!dp) {
|
|
prom_printf("sun4d_init_timers: Unable to find cpu-unit\n");
|
|
prom_halt();
|
|
}
|
|
|
|
/* Which cpu-unit we use is arbitrary, we can view the bootbus timer
|
|
* registers via any cpu's mapping. The first 'reg' property is the
|
|
* bootbus.
|
|
*/
|
|
reg = of_get_property(dp, "reg", NULL);
|
|
if (!reg) {
|
|
prom_printf("sun4d_init_timers: No reg property\n");
|
|
prom_halt();
|
|
}
|
|
|
|
board = of_getintprop_default(dp, "board#", -1);
|
|
if (board == -1) {
|
|
prom_printf("sun4d_init_timers: No board# property on cpu-unit\n");
|
|
prom_halt();
|
|
}
|
|
|
|
of_node_put(dp);
|
|
|
|
res.start = reg[1];
|
|
res.end = reg[2] - 1;
|
|
res.flags = reg[0] & 0xff;
|
|
sun4d_timers = of_ioremap(&res, BW_TIMER_LIMIT,
|
|
sizeof(struct sun4d_timer_regs), "user timer");
|
|
if (!sun4d_timers) {
|
|
prom_printf("sun4d_init_timers: Can't map timer regs\n");
|
|
prom_halt();
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
sparc_config.cs_period = SBUS_CLOCK_RATE * 2; /* 2 seconds */
|
|
#else
|
|
sparc_config.cs_period = SBUS_CLOCK_RATE / HZ; /* 1/HZ sec */
|
|
sparc_config.features |= FEAT_L10_CLOCKEVENT;
|
|
#endif
|
|
sparc_config.features |= FEAT_L10_CLOCKSOURCE;
|
|
sbus_writel(timer_value(sparc_config.cs_period),
|
|
&sun4d_timers->l10_timer_limit);
|
|
|
|
master_l10_counter = &sun4d_timers->l10_cur_count;
|
|
|
|
irq = sun4d_build_timer_irq(board, SUN4D_TIMER_IRQ);
|
|
err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
|
|
if (err) {
|
|
prom_printf("sun4d_init_timers: request_irq() failed with %d\n",
|
|
err);
|
|
prom_halt();
|
|
}
|
|
sun4d_load_profile_irqs();
|
|
sun4d_fixup_trap_table();
|
|
}
|
|
|
|
void __init sun4d_init_sbi_irq(void)
|
|
{
|
|
struct device_node *dp;
|
|
int target_cpu;
|
|
|
|
target_cpu = boot_cpu_id;
|
|
for_each_node_by_name(dp, "sbi") {
|
|
int devid = of_getintprop_default(dp, "device-id", 0);
|
|
int board = of_getintprop_default(dp, "board#", 0);
|
|
unsigned int mask;
|
|
|
|
set_sbi_tid(devid, target_cpu << 3);
|
|
board_to_cpu[board] = target_cpu;
|
|
|
|
/* Get rid of pending irqs from PROM */
|
|
mask = acquire_sbi(devid, 0xffffffff);
|
|
if (mask) {
|
|
printk(KERN_ERR "Clearing pending IRQs %08x on SBI %d\n",
|
|
mask, board);
|
|
release_sbi(devid, mask);
|
|
}
|
|
}
|
|
}
|
|
|
|
void __init sun4d_init_IRQ(void)
|
|
{
|
|
local_irq_disable();
|
|
|
|
sparc_config.init_timers = sun4d_init_timers;
|
|
sparc_config.build_device_irq = sun4d_build_device_irq;
|
|
sparc_config.clock_rate = SBUS_CLOCK_RATE;
|
|
sparc_config.clear_clock_irq = sun4d_clear_clock_irq;
|
|
sparc_config.load_profile_irq = sun4d_load_profile_irq;
|
|
|
|
/* Cannot enable interrupts until OBP ticker is disabled. */
|
|
}
|