Sven Schnelle (svens@stackframe.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/1137
-gerrit
commit 10075b5b1cfec64a25c526e4a4a22017035db2a9 Author: Sven Schnelle svens@stackframe.org Date: Fri Jun 22 11:04:22 2012 +0200
Add generic IOAPIC driver
Used for automatic generation of IOAPIC interrupt entries.
Change-Id: Ia746f01906c840800956ce551306f864e440b6ec Signed-off-by: Sven Schnelle svens@stackframe.org --- src/drivers/generic/ioapic/Kconfig | 2 + src/drivers/generic/ioapic/Makefile.inc | 1 + src/drivers/generic/ioapic/chip.h | 32 +++++++ src/drivers/generic/ioapic/ioapic.c | 135 +++++++++++++++++++++++++++++++ 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 0000000..f8b46cb --- /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 0000000..35d0934 --- /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 0000000..f6b298f --- /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 0000000..9a93c78 --- /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, +};