[PATCH v1 1/2] arch: arm: use dt and UCLASS_IRQ to get gic details

[Rayagonda Kokatanur]

Use device tree and UCLASS_IRQ driver to get following
Generic Interrupt Controller (GIC) details,

-GIC Distributor interface (GICD) base address and
-GIC Redistributors (GICR) base address.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur at broadcom.com>
---
 arch/arm/lib/gic-v3-its.c | 72 +++++++++++++++++++++++++++++++++++----
 1 file changed, 65 insertions(+), 7 deletions(-)

diff --git a/arch/arm/lib/gic-v3-its.c b/arch/arm/lib/gic-v3-its.c
index 90f37a123c..7c4e5f4d07 100644
--- a/arch/arm/lib/gic-v3-its.c
+++ b/arch/arm/lib/gic-v3-its.c
@@ -3,6 +3,7 @@
  * Copyright 2019 Broadcom.
  */
 #include <common.h>
+#include <dm.h>
 #include <asm/gic.h>
 #include <asm/gic-v3.h>
 #include <asm/io.h>
@@ -15,6 +16,48 @@ static u32 lpi_id_bits;
 #define LPI_PROPBASE_SZ		ALIGN(BIT(LPI_NRBITS), SZ_64K)
 #define LPI_PENDBASE_SZ		ALIGN(BIT(LPI_NRBITS) / 8, SZ_64K)
 
+/*
+ * gic_v3_its_priv - gic details
+ *
+ * @gicd_base: gicd base address
+ * @gicr_base: gicr base address
+ */
+struct gic_v3_its_priv {
+	u32 gicd_base;
+	u32 gicr_base;
+};
+
+static int gic_v3_its_get_gic_addr(struct gic_v3_its_priv *priv)
+{
+	struct udevice *dev;
+	fdt_addr_t addr;
+	int ret;
+
+	ret = uclass_get_device_by_driver(UCLASS_IRQ,
+					  DM_GET_DRIVER(arm_gic_v3_its), &dev);
+	if (ret) {
+		pr_err("%s: failed to get %s irq device\n", __func__,
+		       DM_GET_DRIVER(arm_gic_v3_its)->name);
+		return ret;
+	}
+
+	addr = dev_read_addr_index(dev, 0);
+	if (addr == FDT_ADDR_T_NONE) {
+		pr_err("%s: failed to get GICD address\n", __func__);
+		return -EINVAL;
+	}
+	priv->gicd_base = addr;
+
+	addr = dev_read_addr_index(dev, 1);
+	if (addr == FDT_ADDR_T_NONE) {
+		pr_err("%s: failed to get GICR address\n", __func__);
+		return -EINVAL;
+	}
+	priv->gicr_base = addr;
+
+	return 0;
+}
+
 /*
  * Program the GIC LPI configuration tables for all
  * the re-distributors and enable the LPI table
@@ -23,15 +66,18 @@ static u32 lpi_id_bits;
  */
 int gic_lpi_tables_init(u64 base, u32 num_redist)
 {
+	struct gic_v3_its_priv priv;
 	u32 gicd_typer;
 	u64 val;
 	u64 tmp;
 	int i;
 	u64 redist_lpi_base;
-	u64 pend_base = GICR_BASE + GICR_PENDBASER;
+	u64 pend_base;
 
-	gicd_typer = readl(GICD_BASE + GICD_TYPER);
+	if (gic_v3_its_get_gic_addr(&priv))
+		return -EINVAL;
 
+	gicd_typer = readl(priv.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");
@@ -46,7 +92,7 @@ int gic_lpi_tables_init(u64 base, u32 num_redist)
 	for (i = 0; i < num_redist; i++) {
 		u32 offset = i * GIC_REDISTRIBUTOR_OFFSET;
 
-		if ((readl((uintptr_t)(GICR_BASE + offset))) &
+		if ((readl((uintptr_t)(priv.gicr_base + offset))) &
 		    GICR_CTLR_ENABLE_LPIS) {
 			pr_err("Re-Distributor %d LPI is already enabled\n",
 			       i);
@@ -64,19 +110,20 @@ int gic_lpi_tables_init(u64 base, u32 num_redist)
 	       GICR_PROPBASER_RAWAWB |
 	       ((LPI_NRBITS - 1) & GICR_PROPBASER_IDBITS_MASK));
 
-	writeq(val, (GICR_BASE + GICR_PROPBASER));
-	tmp = readl(GICR_BASE + GICR_PROPBASER);
+	writeq(val, (priv.gicr_base + GICR_PROPBASER));
+	tmp = readl(priv.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));
+			writeq(val, (priv.gicr_base + GICR_PROPBASER));
 		}
 	}
 
 	redist_lpi_base = base + LPI_PROPBASE_SZ;
 
+	pend_base = priv.gicr_base + GICR_PENDBASER;
 	for (i = 0; i < num_redist; i++) {
 		u32 offset = i * GIC_REDISTRIBUTOR_OFFSET;
 
@@ -94,9 +141,20 @@ int gic_lpi_tables_init(u64 base, u32 num_redist)
 		}
 
 		/* Enable LPI for the redistributor */
-		writel(GICR_CTLR_ENABLE_LPIS, (uintptr_t)(GICR_BASE + offset));
+		writel(GICR_CTLR_ENABLE_LPIS,
+		       (uintptr_t)(priv.gicr_base + offset));
 	}
 
 	return 0;
 }
 
+static const struct udevice_id gic_v3_its_ids[] = {
+	{ .compatible = "arm,gic-v3" },
+	{}
+};
+
+U_BOOT_DRIVER(arm_gic_v3_its) = {
+	.name		= "gic-v3",
+	.id		= UCLASS_IRQ,
+	.of_match	= gic_v3_its_ids,
+};
-- 
2.17.1