summaryrefslogtreecommitdiff
path: root/arch/sparc/kernel/leon_kernel.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/kernel/leon_kernel.c')
-rw-r--r--arch/sparc/kernel/leon_kernel.c114
1 files changed, 97 insertions, 17 deletions
diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c
index f01c42661ee5..fdab7f854f80 100644
--- a/arch/sparc/kernel/leon_kernel.c
+++ b/arch/sparc/kernel/leon_kernel.c
@@ -23,15 +23,16 @@
#include "prom.h"
#include "irq.h"
-struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address, initialized by amba_init() */
-struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address, initialized by amba_init() */
+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 leon3_gptimer_irq; /* interrupt controller irq number, initialized by amba_init() */
+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]))
@@ -105,21 +106,79 @@ static void leon_disable_irq(unsigned int irq_nr)
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;
- if (leon3_gptimer_regs && leon3_irqctrl_regs) {
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].val, 0);
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].rld,
- (((1000000 / HZ) - 1)));
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl, 0);
+ /*Find IRQMP IRQ Controller Registers base address otherwise bail out.*/
+ rootnp = of_find_node_by_path("/ambapp0");
+ if (!rootnp)
+ goto bad;
+ 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;
+ 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))) {
@@ -127,17 +186,33 @@ void __init leon_init_timers(irq_handler_t counter_fn)
BUG();
}
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].val, 0);
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].rld, (((1000000/HZ) - 1)));
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 0);
+ 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 {
- printk(KERN_ERR "No Timer/irqctrl found\n");
- BUG();
+ goto bad;
}
- irq = request_irq(leon3_gptimer_irq,
+ irq = request_irq(leon3_gptimer_irq+leon3_gptimer_idx,
counter_fn,
(IRQF_DISABLED | SA_STATIC_ALLOC), "timer", NULL);
@@ -169,13 +244,13 @@ void __init leon_init_timers(irq_handler_t counter_fn)
# endif
if (leon3_gptimer_regs) {
- LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl,
+ 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[1].ctrl,
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
LEON3_GPTIMER_EN |
LEON3_GPTIMER_RL |
LEON3_GPTIMER_LD |
@@ -183,6 +258,11 @@ void __init leon_init_timers(irq_handler_t counter_fn)
#endif
}
+ return;
+bad:
+ printk(KERN_ERR "No Timer/irqctrl found\n");
+ BUG();
+ return;
}
void leon_clear_clock_irq(void)
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-28 05:30:55 +0300