tegra132: initialize GIC

This provides are barebones initialization for tegra132 GIC
on CPU0. It routes all interrupts to CPU0, moves them all
into group 1, and attempts to allow non-secure access for
all registers (doesn't appear to be implemented, though).

BUG=chrome-os-partner:31449
BRANCH=None
TEST=Built and booted past smp init in the kernel. Timers
     appear to be flowing now since jiffies are updated.

Change-Id: Id45c13cc23e50feed3d88da13420c9eb694498a0
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 81bad0a53083baa7af0f1fd5f82fef0538ee62df
Original-Change-Id: I69dd9ae53f259e876a9bc4b9d7f65330150d2990
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/212795
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/8995
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

5 files changed, 148 insertions, 0 deletions

diff --git a/src/soc/nvidia/tegra132/Makefile.inc b/src/soc/nvidia/tegra132/Makefile.inc
index fb9b0334ac..b489d52afb 100644
--- a/src/soc/nvidia/tegra132/Makefile.inc
+++ b/src/soc/nvidia/tegra132/Makefile.inc
@@ -54,6 +54,7 @@ ramstage-y += soc.c
 ramstage-y += spi.c
 ramstage-y += i2c.c
 ramstage-y += dma.c
+ramstage-y += gic.c
 ramstage-y += monotonic_timer.c
 ramstage-y += padconfig.c
 ramstage-y += funitcfg.c
diff --git a/src/soc/nvidia/tegra132/gic.c b/src/soc/nvidia/tegra132/gic.c
new file mode 100644
index 0000000000..95b592f799
--- /dev/null
+++ b/src/soc/nvidia/tegra132/gic.c
@@ -0,0 +1,117 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <stdint.h>
+#include <console/console.h>
+#include <soc/addressmap.h>
+#include <soc/ramstage.h>
+
+enum {
+	GICD_CTLR  = 0x0,
+		ENABLE_GRP0 = 0x1 << 0,
+		ENABLE_GRP1 = 0x1 << 1,
+	GICD_TYPER = 0x4,
+	GICD_ITARGETSR = 0x800,
+	GICD_IGROUPR = 0x80,
+	GICD_NSACR = 0xe00,
+
+	GICC_CTLR  = 0x0,
+	GICC_PMR   = 0x4,
+};
+
+struct gicd {
+	uint32_t *base;
+	size_t num_interrupts;
+};
+
+static inline uint32_t gic_read(uint32_t *base, size_t byte_offset)
+{
+	return read32(&base[byte_offset / sizeof(uint32_t)]);
+}
+
+static inline void gic_write(uint32_t *base, size_t byte_offset, uint32_t val)
+{
+	write32(val, &base[byte_offset / sizeof(uint32_t)]);
+}
+
+static inline uint32_t gicd_read(struct gicd *gicd, size_t byte_offset)
+{
+	return gic_read(gicd->base, byte_offset);
+}
+
+static inline void gicd_write(struct gicd *gicd, size_t byte_offset,
+				uint32_t val)
+{
+	gic_write(gicd->base, byte_offset, val);
+}
+
+static void gic_write_regs(uint32_t *base, size_t offset,
+				size_t tot_interrupts,
+				size_t interrupts_per_reg, uint32_t val)
+{
+	size_t i;
+	size_t bound = sizeof(uint32_t) * tot_interrupts / interrupts_per_reg;
+
+	for (i = 0; i < bound; i += sizeof(uint32_t))
+		gic_write(base, offset + i, val);
+}
+
+static void gicd_write_regs(struct gicd *gicd, size_t offset,
+				size_t interrupts_per_reg, uint32_t val)
+{
+	gic_write_regs(gicd->base, offset, gicd->num_interrupts,
+			interrupts_per_reg, val);
+}
+
+static void gicd_init(struct gicd *gicd, uintptr_t base)
+{
+	uint32_t typer;
+
+	gicd->base = (void *)base;
+
+	typer = gicd_read(gicd, GICD_TYPER);
+
+	gicd->num_interrupts = 32 * ((typer & 0x1f) + 1);
+
+	printk(BIOS_DEBUG, "GICD at %p. TYPER=%08x, %zu interrupts.\n",
+		gicd->base, typer, gicd->num_interrupts);
+}
+
+void gic_init(void)
+{
+	struct gicd gicd;
+	uint32_t * const gicc = (void *)(uintptr_t)TEGRA_GICC_BASE;
+
+	gicd_init(&gicd, TEGRA_GICD_BASE);
+
+	/* Enable Group 0 and Group 1 */
+	gicd_write(&gicd, GICD_CTLR, ENABLE_GRP0 | ENABLE_GRP1);
+
+	/* Enable Group 0 and Group 1 in GICC and enable all priroity levels. */
+	gic_write(gicc, GICC_CTLR, ENABLE_GRP0 | ENABLE_GRP1);
+	gic_write(gicc, GICC_PMR, 1 << 7);
+
+	/* All interrupts route go to CPU 0. */
+	gicd_write_regs(&gicd, GICD_ITARGETSR, 4, 0x01010101);
+	/* Put all interrupts into Gropup 1. */
+	gicd_write_regs(&gicd, GICD_IGROUPR, 32, 0xffffffff);
+	/* Allow Non-secure access to everything. */
+	gicd_write_regs(&gicd, GICD_NSACR, 16, 0xffffffff);
+}
diff --git a/src/soc/nvidia/tegra132/include/soc/addressmap.h b/src/soc/nvidia/tegra132/include/soc/addressmap.h
index 732c9e9366..ebe50f553e 100644
--- a/src/soc/nvidia/tegra132/include/soc/addressmap.h
+++ b/src/soc/nvidia/tegra132/include/soc/addressmap.h
@@ -31,6 +31,8 @@ enum {
 
 enum {
 	TEGRA_ARM_PERIPHBASE =		0x50040000,
+	TEGRA_GICD_BASE =		0x50041000,
+	TEGRA_GICC_BASE =		0x50042000,
 	TEGRA_ARM_DISPLAYA =            0x54200000,
 	TEGRA_ARM_DISPLAYB =            0x54240000,
 	TEGRA_ARM_SOR =                 0x54540000,
diff --git a/src/soc/nvidia/tegra132/include/soc/ramstage.h b/src/soc/nvidia/tegra132/include/soc/ramstage.h
new file mode 100644
index 0000000000..e42f56d687
--- /dev/null
+++ b/src/soc/nvidia/tegra132/include/soc/ramstage.h
@@ -0,0 +1,26 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __SOC_NVIDIA_TEGRA132_SOC_RAMSTAGE_H__
+#define __SOC_NVIDIA_TEGRA132_SOC_RAMSTAGE_H__
+
+void gic_init(void);
+
+#endif /* __SOC_NVIDIA_TEGRA132_SOC_RAMSTAGE_H__ */
+
diff --git a/src/soc/nvidia/tegra132/soc.c b/src/soc/nvidia/tegra132/soc.c
index 276ea7b784..13050f6c06 100644
--- a/src/soc/nvidia/tegra132/soc.c
+++ b/src/soc/nvidia/tegra132/soc.c
@@ -24,6 +24,7 @@
 #include <vendorcode/google/chromeos/chromeos.h>
 #include <soc/addressmap.h>
 #include <soc/clock.h>
+#include <soc/ramstage.h>
 #include <soc/nvidia/tegra/apbmisc.h>
 
 static void soc_read_resources(device_t dev)
@@ -59,6 +60,7 @@ static void soc_init(device_t dev)
 {
 	printk(BIOS_INFO, "CPU: Tegra132\n");
 	clock_init_arm_generic_timer();
+	gic_init();
 }
 
 static void soc_noop(device_t dev)