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SPARC/LEON: added support for selecting Timer Core and Timer within core

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The ability to select Timer Core and Timer instance for system clock
makes it possible for multiple AMP systems to coexist.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Hellstrom 2011-01-04 01:41:32 +00:00 committed by David S. Miller
parent 9742e72cd1
commit 2791c1a439
1 changed files with 54 additions and 26 deletions
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80
arch/sparc/kernel/leon_kernel.c
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@ -32,6 +32,7 @@ int leon_debug_irqout;
static int dummy_master_l10_counter;
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]))
@ -105,10 +106,11 @@ 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;
struct device_node *rootnp, *np, *nnp;
struct property *pp;
int len;
int cpu, icsel;
int ampopts;
leondebug_irq_disable = 0;
leon_debug_irqout = 0;
@ -131,30 +133,52 @@ void __init leon_init_timers(irq_handler_t counter_fn)
leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
/* Find GPTIMER Timer Registers base address otherwise bail out. */
np = of_find_node_by_name(rootnp, "GAISLER_GPTIMER");
if (!np) {
np = of_find_node_by_name(np, "01_011");
if (!np)
goto bad;
}
pp = of_find_property(np, "reg", &len);
if (!pp)
goto bad;
leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)pp->value;
pp = of_find_property(np, "interrupts", &len);
if (!pp)
goto bad;
leon3_gptimer_irq = *(unsigned int *)pp->value;
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[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);
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))) {
@ -162,9 +186,13 @@ 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
/*
@ -184,7 +212,7 @@ void __init leon_init_timers(irq_handler_t counter_fn)
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);
@ -216,13 +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 |