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authorJames Hogan <james.hogan@imgtec.com>2015-04-17 10:44:15 +0100
committerRalf Baechle <ralf@linux-mips.org>2015-07-10 11:02:18 +0200
commit6249ecbbb75cd635025cc681fcf51fb8659edbab (patch)
tree3b83c08082dc43bfefec533245ddac0c1c0c6ea4 /arch/mips/mti-malta
parentcccf34e9411c41b0cbfb41980fe55fc8e7c98fd2 (diff)
downloadlinux-6249ecbbb75cd635025cc681fcf51fb8659edbab.tar.bz2
MIPS: Malta: Make GIC FDC IRQ workaround Malta specific
Wider testing reveals that the Fast Debug Channel (FDC) interrupt is routed through the GIC just fine on Pistachio SoC, even though it contains interAptiv cores. Clearly the FDC interrupt routing problems previously observed on interAptiv and proAptiv cores are specific to the Malta FPGA bitstreams. Move the workaround for interAptiv and proAptiv out of gic_get_c0_fdc_int() in the GIC irqchip driver into Malta's get_c0_fdc_int() platform callback, to allow the Pistachio SoC to use the FDC interrupt. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Andrew Bresticker <abrestic@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: linux-mips@linux-mips.org Reviewed-by: Andrew Bresticker <abrestic@chromium.org> Cc: James Hartley <james.hartley@imgtec.com> Patchwork: http://patchwork.linux-mips.org/patch/9748/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mti-malta')
-rw-r--r--arch/mips/mti-malta/malta-time.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/arch/mips/mti-malta/malta-time.c b/arch/mips/mti-malta/malta-time.c
index 185e68261f45..5625b190edc0 100644
--- a/arch/mips/mti-malta/malta-time.c
+++ b/arch/mips/mti-malta/malta-time.c
@@ -119,18 +119,24 @@ void read_persistent_clock(struct timespec *ts)
int get_c0_fdc_int(void)
{
- int mips_cpu_fdc_irq;
+ /*
+ * Some cores claim the FDC is routable through the GIC, but it doesn't
+ * actually seem to be connected for those Malta bitstreams.
+ */
+ switch (current_cpu_type()) {
+ case CPU_INTERAPTIV:
+ case CPU_PROAPTIV:
+ return -1;
+ };
if (cpu_has_veic)
- mips_cpu_fdc_irq = -1;
+ return -1;
else if (gic_present)
- mips_cpu_fdc_irq = gic_get_c0_fdc_int();
+ return gic_get_c0_fdc_int();
else if (cp0_fdc_irq >= 0)
- mips_cpu_fdc_irq = MIPS_CPU_IRQ_BASE + cp0_fdc_irq;
+ return MIPS_CPU_IRQ_BASE + cp0_fdc_irq;
else
- mips_cpu_fdc_irq = -1;
-
- return mips_cpu_fdc_irq;
+ return -1;
}
int get_c0_perfcount_int(void)