summaryrefslogtreecommitdiffstats
path: root/target/linux/ar71xx/patches
diff options
context:
space:
mode:
authorjuhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>2008-07-21 17:08:14 +0000
committerjuhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>2008-07-21 17:08:14 +0000
commit546b5ed544503182a9b3e981bc11feebd6042b21 (patch)
tree10ae3895974888be85ce09abee24fe67b5fbd813 /target/linux/ar71xx/patches
parent541dcce6ec450a2aceaf1b42b67b16ebfc9730aa (diff)
surprise :p
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11894 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/ar71xx/patches')
-rw-r--r--target/linux/ar71xx/patches/001-ar71xx_core.patch61
-rw-r--r--target/linux/ar71xx/patches/002-ar71xx_pci.patch10
-rw-r--r--target/linux/ar71xx/patches/003-ar71xx_usb_host.patch60
-rw-r--r--target/linux/ar71xx/patches/004-ar71xx_spi_controller.patch26
-rw-r--r--target/linux/ar71xx/patches/005-ar71xx_mac_driver.patch21
-rw-r--r--target/linux/ar71xx/patches/100-mtd_pm25lv_flash_support.patch13
-rw-r--r--target/linux/ar71xx/patches/101-ksz8041_phy_driver.patch23
-rw-r--r--target/linux/ar71xx/patches/140-redboot_partition_scan.patch54
-rw-r--r--target/linux/ar71xx/patches/200-rb4xx_nand_driver.patch21
-rw-r--r--target/linux/ar71xx/patches/900-mips_multi_machine_support.patch143
-rw-r--r--target/linux/ar71xx/patches/901-get_c0_compare_irq_function.patch29
-rw-r--r--target/linux/ar71xx/patches/902-mips_clocksource_init_war.patch45
12 files changed, 506 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches/001-ar71xx_core.patch b/target/linux/ar71xx/patches/001-ar71xx_core.patch
new file mode 100644
index 000000000..580620653
--- /dev/null
+++ b/target/linux/ar71xx/patches/001-ar71xx_core.patch
@@ -0,0 +1,61 @@
+--- a/arch/mips/Makefile
++++ b/arch/mips/Makefile
+@@ -593,6 +593,13 @@
+ cflags-$(CONFIG_TOSHIBA_RBTX4938) += -Iinclude/asm-mips/mach-tx49xx
+ load-$(CONFIG_TOSHIBA_RBTX4938) += 0xffffffff80100000
+
++#
++# Atheros AR71xx
++#
++core-$(CONFIG_ATHEROS_AR71XX) += arch/mips/ar71xx/
++cflags-$(CONFIG_ATHEROS_AR71XX) += -Iinclude/asm-mips/mach-ar71xx
++load-$(CONFIG_ATHEROS_AR71XX) += 0xffffffff80060000
++
+ # temporary until string.h is fixed
+ cflags-y += -ffreestanding
+
+--- a/include/asm-mips/bootinfo.h
++++ b/include/asm-mips/bootinfo.h
+@@ -79,6 +79,15 @@
+ #define MACH_LASAT_200 1 /* Masquerade PRO/SP200 */
+
+ /*
++ * Valid machtype for Atheros AR71xx based boards
++ */
++#define MACH_AR71XX_GENERIC 0
++#define MACH_AR71XX_WP543 1 /* Compex WP543 */
++#define MACH_AR71XX_RB_411 2 /* MikroTik RouterBOARD 411 */
++#define MACH_AR71XX_RB_433 3 /* MikroTik RouterBOARD 433/433AH */
++#define MACH_AR71XX_RB_450 4 /* MikroTik RouterBOARD 450 */
++
++/*
+ * Valid machtype for group NEC EMMA2RH
+ */
+ #define MACH_NEC_MARKEINS 0 /* NEC EMMA2RH Mark-eins */
+--- a/arch/mips/Kconfig
++++ b/arch/mips/Kconfig
+@@ -21,6 +21,24 @@
+ config MACH_ALCHEMY
+ bool "Alchemy processor based machines"
+
++config ATHEROS_AR71XX
++ bool "Atheros AR71xx based boards"
++ select CEVT_R4K
++ select CSRC_R4K
++ select DMA_NONCOHERENT
++ select HW_HAS_PCI
++ select IRQ_CPU
++ select GENERIC_GPIO
++ select HAVE_GPIO_LIB
++ select SYS_HAS_CPU_MIPS32_R1
++ select SYS_HAS_CPU_MIPS32_R2
++ select SYS_SUPPORTS_32BIT_KERNEL
++ select SYS_SUPPORTS_BIG_ENDIAN
++ select SYS_HAS_EARLY_PRINTK
++ select MIPS_MACHINE
++ help
++ Support for Atheros AR71xx based boards.
++
+ config BASLER_EXCITE
+ bool "Basler eXcite smart camera"
+ select CEVT_R4K
diff --git a/target/linux/ar71xx/patches/002-ar71xx_pci.patch b/target/linux/ar71xx/patches/002-ar71xx_pci.patch
new file mode 100644
index 000000000..8ae604a24
--- /dev/null
+++ b/target/linux/ar71xx/patches/002-ar71xx_pci.patch
@@ -0,0 +1,10 @@
+--- a/arch/mips/pci/Makefile
++++ b/arch/mips/pci/Makefile
+@@ -15,6 +15,7 @@
+ obj-$(CONFIG_PCI_VR41XX) += ops-vr41xx.o pci-vr41xx.o
+ obj-$(CONFIG_NEC_CMBVR4133) += fixup-vr4133.o
+ obj-$(CONFIG_MARKEINS) += ops-emma2rh.o pci-emma2rh.o fixup-emma2rh.o
++obj-$(CONFIG_ATHEROS_AR71XX) += pci-ar71xx.o
+
+ #
+ # These are still pretty much in the old state, watch, go blind.
diff --git a/target/linux/ar71xx/patches/003-ar71xx_usb_host.patch b/target/linux/ar71xx/patches/003-ar71xx_usb_host.patch
new file mode 100644
index 000000000..33b24750e
--- /dev/null
+++ b/target/linux/ar71xx/patches/003-ar71xx_usb_host.patch
@@ -0,0 +1,60 @@
+--- a/drivers/usb/host/Kconfig
++++ b/drivers/usb/host/Kconfig
+@@ -260,3 +260,15 @@
+ To compile this driver as a module, choose M here: the
+ module will be called r8a66597-hcd.
+
++config USB_OHCI_AR71XX
++ bool "USB OHCI support for Atheros AR71xx"
++ depends on ATHEROS_AR71XX && USB_OHCI_HCD
++ help
++ Support for Atheros AR71xx built-in OHCI controller
++
++config USB_EHCI_AR71XX
++ bool "USB EHCI support for AR71xx"
++ depends on ATHEROS_AR71XX && USB_EHCI_HCD
++ help
++ Support for Atheros AR71xx built-in EHCI controller
++
+--- a/drivers/usb/host/ehci-hcd.c
++++ b/drivers/usb/host/ehci-hcd.c
+@@ -1043,6 +1043,11 @@
+ #define PLATFORM_DRIVER ixp4xx_ehci_driver
+ #endif
+
++#ifdef CONFIG_USB_EHCI_AR71XX
++#include "ehci-ar71xx.c"
++#define PLATFORM_DRIVER ehci_hcd_ar71xx_driver
++#endif
++
+ #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
+ !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER)
+ #error "missing bus glue for ehci-hcd"
+--- a/drivers/usb/host/ohci.h
++++ b/drivers/usb/host/ohci.h
+@@ -538,6 +538,11 @@
+ #define writel_be(val, addr) out_be32((__force unsigned *)addr, val)
+ #endif
+
++#if defined(CONFIG_ATHEROS_AR71XX)
++#define readl_be(addr) __raw_readl(addr)
++#define writel_be(val, addr) __raw_writel(addr, val)
++#endif
++
+ static inline unsigned int _ohci_readl (const struct ohci_hcd *ohci,
+ __hc32 __iomem * regs)
+ {
+--- a/drivers/usb/host/ohci-hcd.c
++++ b/drivers/usb/host/ohci-hcd.c
+@@ -1057,6 +1057,11 @@
+ #define PLATFORM_DRIVER ohci_hcd_sm501_driver
+ #endif
+
++#ifdef CONFIG_USB_OHCI_AR71XX
++#include "ohci-ar71xx.c"
++#define PLATFORM_DRIVER ohci_hcd_ar71xx_driver
++#endif
++
+ #if !defined(PCI_DRIVER) && \
+ !defined(PLATFORM_DRIVER) && \
+ !defined(OF_PLATFORM_DRIVER) && \
diff --git a/target/linux/ar71xx/patches/004-ar71xx_spi_controller.patch b/target/linux/ar71xx/patches/004-ar71xx_spi_controller.patch
new file mode 100644
index 000000000..b2d11ff08
--- /dev/null
+++ b/target/linux/ar71xx/patches/004-ar71xx_spi_controller.patch
@@ -0,0 +1,26 @@
+--- a/drivers/spi/Kconfig
++++ b/drivers/spi/Kconfig
+@@ -52,6 +52,13 @@
+ comment "SPI Master Controller Drivers"
+ depends on SPI_MASTER
+
++config SPI_AR71XX
++ tristate "Atheros AR71xx SPI Controller"
++ depends on SPI_MASTER && ATHEROS_AR71XX
++ select SPI_BITBANG
++ help
++ This is the SPI contoller driver for Atheros AR71xx.
++
+ config SPI_ATMEL
+ tristate "Atmel SPI Controller"
+ depends on (ARCH_AT91 || AVR32) && SPI_MASTER
+--- a/drivers/spi/Makefile
++++ b/drivers/spi/Makefile
+@@ -11,6 +11,7 @@
+ obj-$(CONFIG_SPI_MASTER) += spi.o
+
+ # SPI master controller drivers (bus)
++obj-$(CONFIG_SPI_AR71XX) += ar71xx_spi.o
+ obj-$(CONFIG_SPI_ATMEL) += atmel_spi.o
+ obj-$(CONFIG_SPI_BFIN) += spi_bfin5xx.o
+ obj-$(CONFIG_SPI_BITBANG) += spi_bitbang.o
diff --git a/target/linux/ar71xx/patches/005-ar71xx_mac_driver.patch b/target/linux/ar71xx/patches/005-ar71xx_mac_driver.patch
new file mode 100644
index 000000000..4a009a995
--- /dev/null
+++ b/target/linux/ar71xx/patches/005-ar71xx_mac_driver.patch
@@ -0,0 +1,21 @@
+--- a/drivers/net/Kconfig
++++ b/drivers/net/Kconfig
+@@ -2067,6 +2067,8 @@
+
+ The safe and default value for this is N.
+
++source drivers/net/ag71xx/Kconfig
++
+ config DL2K
+ tristate "DL2000/TC902x-based Gigabit Ethernet support"
+ depends on PCI
+--- a/drivers/net/Makefile
++++ b/drivers/net/Makefile
+@@ -2,6 +2,7 @@
+ # Makefile for the Linux network (ethercard) device drivers.
+ #
+
++obj-$(CONFIG_AG71XX) += ag71xx/
+ obj-$(CONFIG_E1000) += e1000/
+ obj-$(CONFIG_E1000E) += e1000e/
+ obj-$(CONFIG_IBM_EMAC) += ibm_emac/
diff --git a/target/linux/ar71xx/patches/100-mtd_pm25lv_flash_support.patch b/target/linux/ar71xx/patches/100-mtd_pm25lv_flash_support.patch
new file mode 100644
index 000000000..fb763afae
--- /dev/null
+++ b/target/linux/ar71xx/patches/100-mtd_pm25lv_flash_support.patch
@@ -0,0 +1,13 @@
+--- a/drivers/mtd/devices/m25p80.c
++++ b/drivers/mtd/devices/m25p80.c
+@@ -441,6 +441,10 @@
+ { "at26df161a", 0x1f4601, 64 * 1024, 32, SECT_4K, },
+ { "at26df321", 0x1f4701, 64 * 1024, 64, SECT_4K, },
+
++ /* PMC -- pm25x "blocks" are 32K, sectors are 4K */
++ { "pm25lv512", 0, 32 * 1024, 2, SECT_4K },
++ { "pm25lv010", 0, 32 * 1024, 4, SECT_4K },
++
+ /* Spansion -- single (large) sector size only, at least
+ * for the chips listed here (without boot sectors).
+ */
diff --git a/target/linux/ar71xx/patches/101-ksz8041_phy_driver.patch b/target/linux/ar71xx/patches/101-ksz8041_phy_driver.patch
new file mode 100644
index 000000000..9b69eca7c
--- /dev/null
+++ b/target/linux/ar71xx/patches/101-ksz8041_phy_driver.patch
@@ -0,0 +1,23 @@
+--- a/drivers/net/phy/Kconfig
++++ b/drivers/net/phy/Kconfig
+@@ -76,6 +76,11 @@
+ ---help---
+ Currently supports the Marvell 88E6060 switch.
+
++config MICREL_PHY
++ tristate "Drivers for Micrel/Kendin PHYs"
++ ---help---
++ Currently has a driver for the KSZ8041
++
+ config FIXED_PHY
+ bool "Driver for MDIO Bus/PHY emulation with fixed speed/link PHYs"
+ depends on PHYLIB=y
+--- a/drivers/net/phy/Makefile
++++ b/drivers/net/phy/Makefile
+@@ -15,5 +15,6 @@
+ obj-$(CONFIG_ADM6996_PHY) += adm6996.o
+ obj-$(CONFIG_MVSWITCH_PHY) += mvswitch.o
+ obj-$(CONFIG_REALTEK_PHY) += realtek.o
++obj-$(CONFIG_MICREL_PHY) += micrel.o
+ obj-$(CONFIG_FIXED_PHY) += fixed.o
+ obj-$(CONFIG_MDIO_BITBANG) += mdio-bitbang.o
diff --git a/target/linux/ar71xx/patches/140-redboot_partition_scan.patch b/target/linux/ar71xx/patches/140-redboot_partition_scan.patch
new file mode 100644
index 000000000..baf8026a3
--- /dev/null
+++ b/target/linux/ar71xx/patches/140-redboot_partition_scan.patch
@@ -0,0 +1,54 @@
+--- a/drivers/mtd/redboot.c
++++ b/drivers/mtd/redboot.c
+@@ -59,31 +59,32 @@
+ static char nullstring[] = "unallocated";
+ #endif
+
++ buf = vmalloc(master->erasesize);
++ if (!buf)
++ return -ENOMEM;
++
++ restart:
+ if ( directory < 0 ) {
+ offset = master->size + directory * master->erasesize;
+- while (master->block_isbad &&
++ while (master->block_isbad &&
+ master->block_isbad(master, offset)) {
+ if (!offset) {
+ nogood:
+ printk(KERN_NOTICE "Failed to find a non-bad block to check for RedBoot partition table\n");
++ vfree(buf);
+ return -EIO;
+ }
+ offset -= master->erasesize;
+ }
+ } else {
+ offset = directory * master->erasesize;
+- while (master->block_isbad &&
++ while (master->block_isbad &&
+ master->block_isbad(master, offset)) {
+ offset += master->erasesize;
+ if (offset == master->size)
+ goto nogood;
+ }
+ }
+- buf = vmalloc(master->erasesize);
+-
+- if (!buf)
+- return -ENOMEM;
+-
+ printk(KERN_NOTICE "Searching for RedBoot partition table in %s at offset 0x%lx\n",
+ master->name, offset);
+
+@@ -155,6 +156,11 @@
+ }
+ if (i == numslots) {
+ /* Didn't find it */
++ if (offset + master->erasesize < master->size) {
++ /* not at the end of the flash yet, maybe next block :) */
++ directory++;
++ goto restart;
++ }
+ printk(KERN_NOTICE "No RedBoot partition table detected in %s\n",
+ master->name);
+ ret = 0;
diff --git a/target/linux/ar71xx/patches/200-rb4xx_nand_driver.patch b/target/linux/ar71xx/patches/200-rb4xx_nand_driver.patch
new file mode 100644
index 000000000..d9f671664
--- /dev/null
+++ b/target/linux/ar71xx/patches/200-rb4xx_nand_driver.patch
@@ -0,0 +1,21 @@
+--- a/drivers/mtd/nand/Kconfig
++++ b/drivers/mtd/nand/Kconfig
+@@ -330,4 +330,8 @@
+ Enabling this option will enable you to use this to control
+ external NAND devices.
+
++config MTD_NAND_RB4XX
++ tristate "NAND flash driver for RouterBoard 4xx series"
++ depends on MTD_NAND && ATHEROS_AR71XX
++
+ endif # MTD_NAND
+--- a/drivers/mtd/nand/Makefile
++++ b/drivers/mtd/nand/Makefile
+@@ -28,6 +28,7 @@
+ obj-$(CONFIG_MTD_NAND_CM_X270) += cmx270_nand.o
+ obj-$(CONFIG_MTD_NAND_BASLER_EXCITE) += excite_nandflash.o
+ obj-$(CONFIG_MTD_NAND_PLATFORM) += plat_nand.o
++obj-$(CONFIG_MTD_NAND_RB4XX) += rb4xx_nand.o
+ obj-$(CONFIG_MTD_ALAUDA) += alauda.o
+ obj-$(CONFIG_MTD_NAND_PASEMI) += pasemi_nand.o
+ obj-$(CONFIG_MTD_NAND_ORION) += orion_nand.o
diff --git a/target/linux/ar71xx/patches/900-mips_multi_machine_support.patch b/target/linux/ar71xx/patches/900-mips_multi_machine_support.patch
new file mode 100644
index 000000000..8932ba620
--- /dev/null
+++ b/target/linux/ar71xx/patches/900-mips_multi_machine_support.patch
@@ -0,0 +1,143 @@
+--- /dev/null
++++ b/include/asm-mips/mips_machine.h
+@@ -0,0 +1,49 @@
++/*
++ * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
++ *
++ * This program is free software; you can redistribute it and/or modify it
++ * under the terms of the GNU General Public License version 2 as published
++ * by the Free Software Foundation.
++ *
++ */
++
++#ifndef __ASM_MIPS_MACHINE_H
++#define __ASM_MIPS_MACHINE_H
++
++#include <linux/init.h>
++#include <linux/list.h>
++
++#include <asm/bootinfo.h>
++
++#define MIPS_MACHINE_NAME_LEN 64
++
++struct mips_machine {
++ unsigned long mach_type;
++ void (*mach_setup)(void);
++ unsigned char mach_name[MIPS_MACHINE_NAME_LEN];
++ struct list_head list;
++};
++
++void mips_machine_register(struct mips_machine *) __init;
++void mips_machine_setup(void) __init;
++
++extern unsigned char mips_machine_name[MIPS_MACHINE_NAME_LEN];
++
++#define MIPS_MACHINE(_type, _name, _setup) \
++static struct mips_machine machine_##_type __initdata = \
++{ \
++ .mach_type = _type, \
++ .mach_name = _name, \
++ .mach_setup = _setup, \
++}; \
++ \
++static int __init register_machine_##_type(void) \
++{ \
++ mips_machine_register(&machine_##_type); \
++ return 0; \
++} \
++ \
++pure_initcall(register_machine_##_type)
++
++#endif /* __ASM_MIPS_MACHINE_H */
++
+--- /dev/null
++++ b/arch/mips/kernel/mips_machine.c
+@@ -0,0 +1,58 @@
++/*
++ * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
++ *
++ * This program is free software; you can redistribute it and/or modify it
++ * under the terms of the GNU General Public License version 2 as published
++ * by the Free Software Foundation.
++ *
++ */
++
++#include <asm/mips_machine.h>
++#include <asm/bootinfo.h>
++
++static struct list_head mips_machines __initdata =
++ LIST_HEAD_INIT(mips_machines);
++
++unsigned char mips_machine_name[MIPS_MACHINE_NAME_LEN] = "Unknown";
++
++static struct mips_machine * __init mips_machine_find(unsigned long machtype)
++{
++ struct list_head *this;
++
++ list_for_each(this, &mips_machines) {
++ struct mips_machine *mach;
++
++ mach = list_entry(this, struct mips_machine, list);
++ if (mach->mach_type == machtype)
++ return mach;
++ }
++
++ return NULL;
++}
++
++void __init mips_machine_register(struct mips_machine *mach)
++{
++ list_add_tail(&mach->list, &mips_machines);
++}
++
++void __init mips_machine_setup(void)
++{
++ struct mips_machine *mach;
++
++ mach = mips_machine_find(mips_machtype);
++ if (!mach) {
++ printk(KERN_ALERT "MIPS: no machine registered for "
++ "machtype %lu\n", mips_machtype);
++ return;
++ }
++
++ if (mach->mach_name[0])
++ strncpy(mips_machine_name, mach->mach_name,
++ MIPS_MACHINE_NAME_LEN);
++
++ printk(KERN_INFO "MIPS: machine is %s\n", mips_machine_name);
++
++ if (mach->mach_setup)
++ mach->mach_setup();
++}
++
+--- a/arch/mips/kernel/Makefile
++++ b/arch/mips/kernel/Makefile
+@@ -79,6 +79,7 @@
+
+ obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
+ obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
++obj-$(CONFIG_MIPS_MACHINE) += mips_machine.o
+
+ CFLAGS_cpu-bugs64.o = $(shell if $(CC) $(KBUILD_CFLAGS) -Wa,-mdaddi -c -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo "-DHAVE_AS_SET_DADDI"; fi)
+
+--- a/arch/mips/Kconfig
++++ b/arch/mips/Kconfig
+@@ -700,6 +700,7 @@
+
+ endchoice
+
++source "arch/mips/ar71xx/Kconfig"
+ source "arch/mips/au1000/Kconfig"
+ source "arch/mips/basler/excite/Kconfig"
+ source "arch/mips/jazz/Kconfig"
+@@ -857,6 +858,9 @@
+ config MIPS_DISABLE_OBSOLETE_IDE
+ bool
+
++config MIPS_MACHINE
++ def_bool n
++
+ config NO_IOPORT
+ def_bool n
+
diff --git a/target/linux/ar71xx/patches/901-get_c0_compare_irq_function.patch b/target/linux/ar71xx/patches/901-get_c0_compare_irq_function.patch
new file mode 100644
index 000000000..0cc114db9
--- /dev/null
+++ b/target/linux/ar71xx/patches/901-get_c0_compare_irq_function.patch
@@ -0,0 +1,29 @@
+--- a/arch/mips/kernel/traps.c
++++ b/arch/mips/kernel/traps.c
+@@ -42,6 +42,7 @@
+ #include <asm/mmu_context.h>
+ #include <asm/types.h>
+ #include <asm/stacktrace.h>
++#include <asm/time.h>
+
+ extern asmlinkage void handle_int(void);
+ extern asmlinkage void handle_tlbm(void);
+@@ -1379,6 +1380,8 @@
+ */
+ if (cpu_has_mips_r2) {
+ cp0_compare_irq = (read_c0_intctl() >> 29) & 7;
++ if (get_c0_compare_irq)
++ cp0_compare_irq = get_c0_compare_irq();
+ cp0_perfcount_irq = (read_c0_intctl() >> 26) & 7;
+ if (cp0_perfcount_irq == cp0_compare_irq)
+ cp0_perfcount_irq = -1;
+--- a/include/asm-mips/time.h
++++ b/include/asm-mips/time.h
+@@ -53,6 +53,7 @@
+ #ifdef CONFIG_CEVT_R4K
+ extern int mips_clockevent_init(void);
+ extern unsigned int __weak get_c0_compare_int(void);
++extern unsigned int __weak get_c0_compare_irq(void);
+ #else
+ static inline int mips_clockevent_init(void)
+ {
diff --git a/target/linux/ar71xx/patches/902-mips_clocksource_init_war.patch b/target/linux/ar71xx/patches/902-mips_clocksource_init_war.patch
new file mode 100644
index 000000000..0f1bc95ad
--- /dev/null
+++ b/target/linux/ar71xx/patches/902-mips_clocksource_init_war.patch
@@ -0,0 +1,45 @@
+--- a/include/asm-mips/hazards.h
++++ b/include/asm-mips/hazards.h
+@@ -64,7 +64,7 @@
+ _ehb
+ )
+ ASMMACRO(back_to_back_c0_hazard,
+- _ehb
++ _ssnop; _ssnop; _ssnop; _ehb
+ )
+ /*
+ * gcc has a tradition of misscompiling the previous construct using the
+--- a/arch/mips/kernel/cevt-r4k.c
++++ b/arch/mips/kernel/cevt-r4k.c
+@@ -187,7 +187,7 @@
+ */
+ if (c0_compare_int_pending()) {
+ write_c0_compare(read_c0_count());
+- irq_disable_hazard();
++ back_to_back_c0_hazard();
+ if (c0_compare_int_pending())
+ return 0;
+ }
+@@ -196,7 +196,7 @@
+ cnt = read_c0_count();
+ cnt += delta;
+ write_c0_compare(cnt);
+- irq_disable_hazard();
++ back_to_back_c0_hazard();
+ if ((int)(read_c0_count() - cnt) < 0)
+ break;
+ /* increase delta if the timer was already expired */
+@@ -205,11 +205,12 @@
+ while ((int)(read_c0_count() - cnt) <= 0)
+ ; /* Wait for expiry */
+
++ back_to_back_c0_hazard();
+ if (!c0_compare_int_pending())
+ return 0;
+
+ write_c0_compare(read_c0_count());
+- irq_disable_hazard();
++ back_to_back_c0_hazard();
+ if (c0_compare_int_pending())
+ return 0;
+