arch: arm: Program GIC LPI configuration table
Programs the following:
1. Redistributor PROCBASER configuration table (which
is common for all redistributors)
2. Redistributor pending table (PENDBASER), for all the
available redistributors.
Signed-off-by: Bharat Kumar Reddy Gooty <bharat.gooty@broadcom.com>
Signed-off-by: Vladimir Olovyannikov <vladimir.olovyannikov@broadcom.com>
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 9de9a9a..8482f54 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -52,6 +52,7 @@
ifneq ($(CONFIG_GICV2)$(CONFIG_GICV3),)
obj-y += gic_64.o
endif
+obj-$(CONFIG_GIC_V3_ITS) += gic-v3-its.o
obj-y += interrupts_64.o
else
obj-y += interrupts.o
diff --git a/arch/arm/lib/gic-v3-its.c b/arch/arm/lib/gic-v3-its.c
new file mode 100644
index 0000000..e19ab01
--- /dev/null
+++ b/arch/arm/lib/gic-v3-its.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 Broadcom.
+ */
+#include <common.h>
+#include <asm/gic.h>
+#include <asm/gic-v3.h>
+#include <asm/io.h>
+
+static u32 lpi_id_bits;
+
+#define LPI_NRBITS lpi_id_bits
+#define LPI_PROPBASE_SZ ALIGN(BIT(LPI_NRBITS), SZ_64K)
+#define LPI_PENDBASE_SZ ALIGN(BIT(LPI_NRBITS) / 8, SZ_64K)
+
+/*
+ * Program the GIC LPI configuration tables for all
+ * the re-distributors and enable the LPI table
+ * base: Configuration table address
+ * num_redist: number of redistributors
+ */
+int gic_lpi_tables_init(u64 base, u32 num_redist)
+{
+ u32 gicd_typer;
+ u64 val;
+ u64 tmp;
+ int i;
+ u64 redist_lpi_base;
+ u64 pend_base = GICR_BASE + GICR_PENDBASER;
+
+ gicd_typer = readl(GICD_BASE + GICD_TYPER);
+
+ /* GIC support for Locality specific peripheral interrupts (LPI's) */
+ if (!(gicd_typer & GICD_TYPER_LPIS)) {
+ pr_err("GIC implementation does not support LPI's\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Check for LPI is disabled for all the redistributors.
+ * Once the LPI table is enabled, can not program the
+ * LPI configuration tables again, unless the GIC is reset.
+ */
+ for (i = 0; i < num_redist; i++) {
+ u32 offset = i * GIC_REDISTRIBUTOR_OFFSET;
+
+ if ((readl((uintptr_t)(GICR_BASE + offset))) &
+ GICR_CTLR_ENABLE_LPIS) {
+ pr_err("Re-Distributor %d LPI is already enabled\n",
+ i);
+ return -EINVAL;
+ }
+ }
+
+ /* lpi_id_bits to get LPI_PENDBASE_SZ and LPi_PROPBASE_SZ */
+ lpi_id_bits = min_t(u32, GICD_TYPER_ID_BITS(gicd_typer),
+ ITS_MAX_LPI_NRBITS);
+
+ /* Set PropBase */
+ val = (base |
+ GICR_PROPBASER_INNERSHAREABLE |
+ GICR_PROPBASER_RAWAWB |
+ ((LPI_NRBITS - 1) & GICR_PROPBASER_IDBITS_MASK));
+
+ writeq(val, (GICR_BASE + GICR_PROPBASER));
+ tmp = readl(GICR_BASE + GICR_PROPBASER);
+ if ((tmp ^ val) & GICR_PROPBASER_SHAREABILITY_MASK) {
+ if (!(tmp & GICR_PROPBASER_SHAREABILITY_MASK)) {
+ val &= ~(GICR_PROPBASER_SHAREABILITY_MASK |
+ GICR_PROPBASER_CACHEABILITY_MASK);
+ val |= GICR_PROPBASER_NC;
+ writeq(val, (GICR_BASE + GICR_PROPBASER));
+ }
+ }
+
+ redist_lpi_base = base + LPI_PROPBASE_SZ;
+
+ for (i = 0; i < num_redist; i++) {
+ u32 offset = i * GIC_REDISTRIBUTOR_OFFSET;
+
+ val = ((redist_lpi_base + (i * LPI_PENDBASE_SZ)) |
+ GICR_PENDBASER_INNERSHAREABLE |
+ GICR_PENDBASER_RAWAWB);
+
+ writeq(val, (uintptr_t)(pend_base + offset));
+ tmp = readq((uintptr_t)(pend_base + offset));
+ if (!(tmp & GICR_PENDBASER_SHAREABILITY_MASK)) {
+ val &= ~(GICR_PENDBASER_SHAREABILITY_MASK |
+ GICR_PENDBASER_CACHEABILITY_MASK);
+ val |= GICR_PENDBASER_NC;
+ writeq(val, (uintptr_t)(pend_base + offset));
+ }
+
+ /* Enable LPI for the redistributor */
+ writel(GICR_CTLR_ENABLE_LPIS, (uintptr_t)(GICR_BASE + offset));
+ }
+
+ return 0;
+}
+