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linux/arch/sparc/kernel/leon_kernel.c

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/*
* Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
* Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <linux/of_device.h>
#include <asm/oplib.h>
#include <asm/timer.h>
#include <asm/prom.h>
#include <asm/leon.h>
#include <asm/leon_amba.h>
#include <asm/traps.h>
#include <asm/cacheflush.h>
#include "prom.h"
#include "irq.h"
struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
struct amba_apb_device leon_percpu_timer_dev[16];
int leondebug_irq_disable;
int leon_debug_irqout;
static int dummy_master_l10_counter;
unsigned long amba_system_id;
unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
unsigned int sparc_leon_eirq;
#define LEON_IMASK ((&leon3_irqctrl_regs->mask[0]))
/* Return the IRQ of the pending IRQ on the extended IRQ controller */
int sparc_leon_eirq_get(int eirq, int cpu)
{
return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
}
irqreturn_t sparc_leon_eirq_isr(int dummy, void *dev_id)
{
printk(KERN_ERR "sparc_leon_eirq_isr: ERROR EXTENDED IRQ\n");
return IRQ_HANDLED;
}
/* The extended IRQ controller has been found, this function registers it */
void sparc_leon_eirq_register(int eirq)
{
int irq;
/* Register a "BAD" handler for this interrupt, it should never happen */
irq = request_irq(eirq, sparc_leon_eirq_isr,
(IRQF_DISABLED | SA_STATIC_ALLOC), "extirq", NULL);
if (irq) {
printk(KERN_ERR
"sparc_leon_eirq_register: unable to attach IRQ%d\n",
eirq);
} else {
sparc_leon_eirq = eirq;
}
}
static inline unsigned long get_irqmask(unsigned int irq)
{
unsigned long mask;
if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
|| ((irq > 0x1f) && sparc_leon_eirq)) {
printk(KERN_ERR
"leon_get_irqmask: false irq number: %d\n", irq);
mask = 0;
} else {
mask = LEON_HARD_INT(irq);
}
return mask;
}
static void leon_enable_irq(unsigned int irq_nr)
{
unsigned long mask, flags;
mask = get_irqmask(irq_nr);
local_irq_save(flags);
LEON3_BYPASS_STORE_PA(LEON_IMASK,
(LEON3_BYPASS_LOAD_PA(LEON_IMASK) | (mask)));
local_irq_restore(flags);
}
static void leon_disable_irq(unsigned int irq_nr)
{
unsigned long mask, flags;
mask = get_irqmask(irq_nr);
local_irq_save(flags);
LEON3_BYPASS_STORE_PA(LEON_IMASK,
(LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask)));
local_irq_restore(flags);
}
void __init leon_init_timers(irq_handler_t counter_fn)
{
int irq;
struct device_node *rootnp, *np, *nnp;
struct property *pp;
int len;
int cpu, icsel;
int ampopts;
leondebug_irq_disable = 0;
leon_debug_irqout = 0;
master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
dummy_master_l10_counter = 0;
rootnp = of_find_node_by_path("/ambapp0");
if (!rootnp)
goto bad;
/* Find System ID: GRLIB build ID and optional CHIP ID */
pp = of_find_property(rootnp, "systemid", &len);
if (pp)
amba_system_id = *(unsigned long *)pp->value;
/* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
if (!np) {
np = of_find_node_by_name(rootnp, "01_00d");
if (!np)
goto bad;
}
pp = of_find_property(np, "reg", &len);
if (!pp)
goto bad;
leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
/* Find GPTIMER Timer Registers base address otherwise bail out. */
nnp = rootnp;
do {
np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
if (!np) {
np = of_find_node_by_name(nnp, "01_011");
if (!np)
goto bad;
}
ampopts = 0;
pp = of_find_property(np, "ampopts", &len);
if (pp) {
ampopts = *(int *)pp->value;
if (ampopts == 0) {
/* Skip this instance, resource already
* allocated by other OS */
nnp = np;
continue;
}
}
/* Select Timer-Instance on Timer Core. Default is zero */
leon3_gptimer_idx = ampopts & 0x7;
pp = of_find_property(np, "reg", &len);
if (pp)
leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
pp->value;
pp = of_find_property(np, "interrupts", &len);
if (pp)
leon3_gptimer_irq = *(unsigned int *)pp->value;
} while (0);
if (leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq) {
LEON3_BYPASS_STORE_PA(
&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
LEON3_BYPASS_STORE_PA(
&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
(((1000000 / HZ) - 1)));
LEON3_BYPASS_STORE_PA(
&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
#ifdef CONFIG_SMP
leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs;
leon_percpu_timer_dev[0].irq = leon3_gptimer_irq + 1 +
leon3_gptimer_idx;
if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
(1<<LEON3_GPTIMER_SEPIRQ))) {
prom_printf("irq timer not configured with separate irqs\n");
BUG();
}
LEON3_BYPASS_STORE_PA(
&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 0);
LEON3_BYPASS_STORE_PA(
&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
(((1000000/HZ) - 1)));
LEON3_BYPASS_STORE_PA(
&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 0);
# endif
/*
* The IRQ controller may (if implemented) consist of multiple
* IRQ controllers, each mapped on a 4Kb boundary.
* Each CPU may be routed to different IRQCTRLs, however
* we assume that all CPUs (in SMP system) is routed to the
* same IRQ Controller, and for non-SMP only one IRQCTRL is
* accessed anyway.
* In AMP systems, Linux must run on CPU0 for the time being.
*/
cpu = sparc_leon3_cpuid();
icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]);
icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf;
leon3_irqctrl_regs += icsel;
} else {
goto bad;
}
irq = request_irq(leon3_gptimer_irq+leon3_gptimer_idx,
counter_fn,
(IRQF_DISABLED | SA_STATIC_ALLOC), "timer", NULL);
if (irq) {
printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n",
LEON_INTERRUPT_TIMER1);
prom_halt();
}
# ifdef CONFIG_SMP
{
unsigned long flags;
struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)];
/* For SMP we use the level 14 ticker, however the bootup code
* has copied the firmwares level 14 vector into 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 */
/* Adjust so that we jump directly to smpleon_ticker */
trap_table->inst_three += smpleon_ticker - real_irq_entry;
local_flush_cache_all();
local_irq_restore(flags);
}
# endif
if (leon3_gptimer_regs) {
LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
LEON3_GPTIMER_EN |
LEON3_GPTIMER_RL |
LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
#ifdef CONFIG_SMP
LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
LEON3_GPTIMER_EN |
LEON3_GPTIMER_RL |
LEON3_GPTIMER_LD |
LEON3_GPTIMER_IRQEN);
#endif
}
return;
bad:
printk(KERN_ERR "No Timer/irqctrl found\n");
BUG();
return;
}
void leon_clear_clock_irq(void)
{
}
void leon_load_profile_irq(int cpu, unsigned int limit)
{
BUG();
}
void __init leon_trans_init(struct device_node *dp)
{
if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
struct property *p;
p = of_find_property(dp, "mid", (void *)0);
if (p) {
int mid;
dp->name = prom_early_alloc(5 + 1);
memcpy(&mid, p->value, p->length);
sprintf((char *)dp->name, "cpu%.2d", mid);
}
}
}
void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
{
if (prom_amba_init &&
strcmp(dp->type, "ambapp") == 0 &&
strcmp(dp->name, "ambapp0") == 0) {
prom_amba_init(dp, nextp);
}
}
#ifdef CONFIG_SMP
void leon_set_cpu_int(int cpu, int level)
{
unsigned long mask;
mask = get_irqmask(level);
LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
}
static void leon_clear_ipi(int cpu, int level)
{
unsigned long mask;
mask = get_irqmask(level);
LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
}
static void leon_set_udt(int cpu)
{
}
void leon_clear_profile_irq(int cpu)
{
}
void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
{
unsigned long mask, flags, *addr;
mask = get_irqmask(irq_nr);
local_irq_save(flags);
addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]);
LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask)));
local_irq_restore(flags);
}
#endif
void __init leon_init_IRQ(void)
{
sparc_irq_config.init_timers = leon_init_timers;
BTFIXUPSET_CALL(enable_irq, leon_enable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(disable_irq, leon_disable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(enable_pil_irq, leon_enable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(disable_pil_irq, leon_disable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
BTFIXUPCALL_NOP);
#ifdef CONFIG_SMP
BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
#endif
}
void __init leon_init(void)
{
of_pdt_build_more = &leon_node_init;
}
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