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authorJean-Philippe Brucker <jean-philippe.brucker@arm.com>2015-10-01 13:47:14 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2015-10-09 23:11:50 +0100
commit7936e914f7b0827c2dcfe63fbefdc21de2d61dcb (patch)
tree4e10afe8e66a8e005b0e87f7d98898371ced5021 /drivers/irqchip
parentee5f7d6462c56ba083d5d80aa0d69914068a59ae (diff)
downloadlinux-7936e914f7b0827c2dcfe63fbefdc21de2d61dcb.tar.bz2
irqchip/gic-v3: Refactor the arm64 specific parts
This patch moves the GICv3 system register access helpers to arch/arm64/. Their 32bit counterparts will need to use mrc/mcr accesses instead of mrs_s/msr_s. [maz: fixed conflict with Cavium erratum handling] Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-gic-v3.c57
1 files changed, 4 insertions, 53 deletions
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 936da87c1070..bf3df7961a5b 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -108,37 +108,7 @@ static void gic_redist_wait_for_rwp(void)
gic_do_wait_for_rwp(gic_data_rdist_rd_base());
}
-/* Low level accessors */
-static u64 gic_read_iar_common(void)
-{
- u64 irqstat;
-
- asm volatile("mrs_s %0, " __stringify(ICC_IAR1_EL1) : "=r" (irqstat));
- return irqstat;
-}
-
-/*
- * Cavium ThunderX erratum 23154
- *
- * The gicv3 of ThunderX requires a modified version for reading the
- * IAR status to ensure data synchronization (access to icc_iar1_el1
- * is not sync'ed before and after).
- */
-static u64 gic_read_iar_cavium_thunderx(void)
-{
- u64 irqstat;
-
- asm volatile(
- "nop;nop;nop;nop\n\t"
- "nop;nop;nop;nop\n\t"
- "mrs_s %0, " __stringify(ICC_IAR1_EL1) "\n\t"
- "nop;nop;nop;nop"
- : "=r" (irqstat));
- mb();
-
- return irqstat;
-}
-
+#ifdef CONFIG_ARM64
static DEFINE_STATIC_KEY_FALSE(is_cavium_thunderx);
static u64 __maybe_unused gic_read_iar(void)
@@ -148,28 +118,7 @@ static u64 __maybe_unused gic_read_iar(void)
else
return gic_read_iar_common();
}
-
-static void __maybe_unused gic_write_pmr(u64 val)
-{
- asm volatile("msr_s " __stringify(ICC_PMR_EL1) ", %0" : : "r" (val));
-}
-
-static void __maybe_unused gic_write_ctlr(u64 val)
-{
- asm volatile("msr_s " __stringify(ICC_CTLR_EL1) ", %0" : : "r" (val));
- isb();
-}
-
-static void __maybe_unused gic_write_grpen1(u64 val)
-{
- asm volatile("msr_s " __stringify(ICC_GRPEN1_EL1) ", %0" : : "r" (val));
- isb();
-}
-
-static void __maybe_unused gic_write_sgi1r(u64 val)
-{
- asm volatile("msr_s " __stringify(ICC_SGI1R_EL1) ", %0" : : "r" (val));
-}
+#endif
static void gic_enable_redist(bool enable)
{
@@ -856,8 +805,10 @@ static const struct irq_domain_ops gic_irq_domain_ops = {
static void gicv3_enable_quirks(void)
{
+#ifdef CONFIG_ARM64
if (cpus_have_cap(ARM64_WORKAROUND_CAVIUM_23154))
static_branch_enable(&is_cavium_thunderx);
+#endif
}
static int __init gic_of_init(struct device_node *node, struct device_node *parent)