Add generic IOAPIC driver

Used for automatic generation of IOAPIC interrupt entries.

Change-Id: Ia746f01906c840800956ce551306f864e440b6ec
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/1137
Tested-by: build bot (Jenkins)

4 files changed, 170 insertions, 0 deletions

diff --git a/src/drivers/generic/ioapic/Kconfig b/src/drivers/generic/ioapic/Kconfig
new file mode 100644
index 0000000000..f8b46cb3d8
--- /dev/null
+++ b/src/drivers/generic/ioapic/Kconfig
@@ -0,0 +1,2 @@
+config DRIVERS_GENERIC_IOAPIC
+	bool
diff --git a/src/drivers/generic/ioapic/Makefile.inc b/src/drivers/generic/ioapic/Makefile.inc
new file mode 100644
index 0000000000..35d0934466
--- /dev/null
+++ b/src/drivers/generic/ioapic/Makefile.inc
@@ -0,0 +1 @@
+driver-$(CONFIG_DRIVERS_GENERIC_IOAPIC) += ioapic.c
diff --git a/src/drivers/generic/ioapic/chip.h b/src/drivers/generic/ioapic/chip.h
new file mode 100644
index 0000000000..f6b298f077
--- /dev/null
+++ b/src/drivers/generic/ioapic/chip.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Sven Schnelle <svens@stackframe.org>
+ *
+ * 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 DRIVERS_GENERIC_IOAPIC_CHIP_H
+#define DRIVERS_GENERIC_IOAPIC_CHIP_H
+
+extern struct chip_operations drivers_generic_ioapic_ops;
+struct drivers_generic_ioapic_config {
+	u32 version;
+	u8 apicid;
+	u8 irq_on_fsb;
+	u8 enable_virtual_wire;
+	u8 have_isa_interrupts;
+	u32 base;
+};
+#endif
diff --git a/src/drivers/generic/ioapic/ioapic.c b/src/drivers/generic/ioapic/ioapic.c
new file mode 100644
index 0000000000..9a93c78336
--- /dev/null
+++ b/src/drivers/generic/ioapic/ioapic.c
@@ -0,0 +1,135 @@
+#include <console/console.h>
+#include <device/device.h>
+#include <device/smbus.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <cpu/x86/msr.h>
+#include <reset.h>
+#include <delay.h>
+#include "chip.h"
+#include <arch/ioapic.h>
+#include <arch/io.h>
+#include <cpu/x86/lapic.h>
+
+static u32 io_apic_read(u32 ioapic_base, u32 reg)
+{
+	write32(ioapic_base, reg);
+	return read32(ioapic_base + 0x10);
+}
+
+static void io_apic_write(u32 ioapic_base, u32 reg, u32 value)
+{
+	write32(ioapic_base, reg);
+	write32(ioapic_base + 0x10, value);
+}
+
+static void ioapic_init(device_t dev)
+{
+	struct drivers_generic_ioapic_config *config = dev->chip_info;
+	u32 bsp_lapicid = lapicid();
+	u32 low, high;
+	u32 i, ioapic_interrupts;
+	u32 ioapic_base;
+	u8 ioapic_id;
+	if (!dev->enabled || !config)
+		return;
+
+	ioapic_base = config->base;
+	ioapic_id = config->apicid;
+
+	printk(BIOS_DEBUG, "IOAPIC: Initializing IOAPIC at 0x%08x\n",
+	       ioapic_base);
+	printk(BIOS_DEBUG, "IOAPIC: Bootstrap Processor Local APIC = 0x%02x\n",
+	       bsp_lapicid);
+
+	if (ioapic_id) {
+		printk(BIOS_DEBUG, "IOAPIC: ID = 0x%02x\n", ioapic_id);
+		/* Set IOAPIC ID if it has been specified. */
+		io_apic_write(ioapic_base, 0x00,
+			(io_apic_read(ioapic_base, 0x00) & 0xf0ffffff) |
+			(ioapic_id << 24));
+	}
+
+	/* Read the available number of interrupts. */
+	ioapic_interrupts = (io_apic_read(ioapic_base, 0x01) >> 16) & 0xff;
+	if (!ioapic_interrupts || ioapic_interrupts == 0xff)
+		ioapic_interrupts = 24;
+	printk(BIOS_DEBUG, "IOAPIC: %d interrupts\n", ioapic_interrupts);
+
+	if (config->irq_on_fsb) {
+		/*
+		 * For the Pentium 4 and above APICs deliver their interrupts
+		 * on the front side bus, enable that.
+		 */
+		printk(BIOS_DEBUG, "IOAPIC: Enabling interrupts on FSB\n");
+		io_apic_write(ioapic_base, 0x03,
+		      io_apic_read(ioapic_base, 0x03) | (1 << 0));
+	} else {
+		printk(BIOS_DEBUG, "IOAPIC: Enabling interrupts on APIC serial bus\n");
+		io_apic_write(ioapic_base, 0x03, 0);
+	}
+
+	if (config->enable_virtual_wire) {
+		/* Enable Virtual Wire Mode. */
+		low = ENABLED | TRIGGER_EDGE | POLARITY_HIGH | PHYSICAL_DEST | ExtINT;
+		high = bsp_lapicid << (56 - 32);
+
+		io_apic_write(ioapic_base, 0x10, low);
+		io_apic_write(ioapic_base, 0x11, high);
+
+		if (io_apic_read(ioapic_base, 0x10) == 0xffffffff) {
+			printk(BIOS_WARNING, "IOAPIC not responding.\n");
+			return;
+		}
+
+		printk(BIOS_SPEW, "IOAPIC: reg 0x%08x value 0x%08x 0x%08x\n", 0,
+			high, low);
+	}
+	low = DISABLED;
+	high = NONE;
+
+	for (i = 1; i < ioapic_interrupts; i++) {
+		io_apic_write(ioapic_base, i * 2 + 0x10, low);
+		io_apic_write(ioapic_base, i * 2 + 0x11, high);
+
+		printk(BIOS_SPEW, "IOAPIC: reg 0x%08x value 0x%08x 0x%08x\n",
+		       i, high, low);
+	}
+}
+
+static void ioapic_enable_resources(device_t dev)
+{
+}
+
+static void ioapic_nop(device_t dummy)
+{
+}
+
+static void ioapic_read_resources(device_t dev)
+{
+	struct drivers_generic_ioapic_config *config = (struct drivers_generic_ioapic_config *)dev->chip_info;
+	struct resource *res;
+
+	res = new_resource(dev, 0);
+	res->base = config->base;
+	res->size = 0x1000;
+	res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+}
+
+static struct device_operations ioapic_operations = {
+        .read_resources   = ioapic_read_resources,
+        .set_resources    = ioapic_nop,
+        .enable_resources = ioapic_enable_resources,
+        .init             = ioapic_init,
+};
+
+static void enable_dev(struct device *dev)
+{
+	dev->ops = &ioapic_operations;
+}
+
+struct chip_operations drivers_generic_ioapic_ops = {
+	CHIP_NAME("IOAPIC")
+	.enable_dev = enable_dev,
+};