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SPARC/LEON: added support for IRQAMP IRQ Controller

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Needed for LEON AMP systems where different CPUs are routed to

different IRQ controllers. This patch selects the IRQ Controller
which has been routed to the boot CPU, it is up to the boot loader
to configure the IRQ controller.

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 01:41:30 +00:00
committed by David S. Miller
parent 53aea7caf2
commit e2305e37d4
3 changed files with 29 additions and 3 deletions
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14
arch/sparc/kernel/leon_kernel.c
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@@ -108,6 +108,7 @@ void __init leon_init_timers(irq_handler_t counter_fn)
struct device_node *rootnp, *np;
struct property *pp;
int len;
int cpu, icsel;
leondebug_irq_disable = 0;
leon_debug_irqout = 0;
@@ -160,6 +161,19 @@ void __init leon_init_timers(irq_handler_t counter_fn)
LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[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;
}