diff options
author | Dan Williams <dan.j.williams@intel.com> | 2007-02-13 19:12:04 +0300 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-02-14 18:21:24 +0300 |
commit | 588ef7693574cfbcb228f48d5478c2b39a9b0c9f (patch) | |
tree | 6cc5ac8e7d2544514ab405357f01a91da8471780 /arch/arm/plat-iop | |
parent | dfc544c7216b276c1e9c0c753299692df4068c44 (diff) | |
download | linux-588ef7693574cfbcb228f48d5478c2b39a9b0c9f.tar.xz |
[ARM] 4184/1: iop: cp6 access handler (undef_hook)
Enable svc access to cp6 via an undefined instruction hook. Do not enable
access for usr code.
This patch also makes iop13xx select PLAT_IOP, this requires a small change
to drivers/i2c/busses/i2c-iop3xx.c.
Per Lennert Buytenhek's note, the cp6 trap routine is moved to arch/arm/plat-iop
Per Nicolas Pitre's note, the cp_wait is skipped since the latency to
return to the faulting function is longer than cp_wait.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/plat-iop')
-rw-r--r-- | arch/arm/plat-iop/Makefile | 30 | ||||
-rw-r--r-- | arch/arm/plat-iop/cp6.c | 50 |
2 files changed, 76 insertions, 4 deletions
diff --git a/arch/arm/plat-iop/Makefile b/arch/arm/plat-iop/Makefile index ed91463967af..3250d732a171 100644 --- a/arch/arm/plat-iop/Makefile +++ b/arch/arm/plat-iop/Makefile @@ -2,7 +2,29 @@ # Makefile for the linux kernel. # -obj-y := gpio.o i2c.o pci.o setup.o time.o io.o -obj-m := -obj-n := -obj- := +obj-y := + +# IOP32X +obj-$(CONFIG_ARCH_IOP32X) += gpio.o +obj-$(CONFIG_ARCH_IOP32X) += i2c.o +obj-$(CONFIG_ARCH_IOP32X) += pci.o +obj-$(CONFIG_ARCH_IOP32X) += setup.o +obj-$(CONFIG_ARCH_IOP32X) += time.o +obj-$(CONFIG_ARCH_IOP32X) += io.o +obj-$(CONFIG_ARCH_IOP32X) += cp6.o + +# IOP33X +obj-$(CONFIG_ARCH_IOP33X) += gpio.o +obj-$(CONFIG_ARCH_IOP33X) += i2c.o +obj-$(CONFIG_ARCH_IOP33X) += pci.o +obj-$(CONFIG_ARCH_IOP33X) += setup.o +obj-$(CONFIG_ARCH_IOP33X) += time.o +obj-$(CONFIG_ARCH_IOP33X) += io.o +obj-$(CONFIG_ARCH_IOP33X) += cp6.o + +# IOP13XX +obj-$(CONFIG_ARCH_IOP13XX) += cp6.o + +obj-m := +obj-n := +obj- := diff --git a/arch/arm/plat-iop/cp6.c b/arch/arm/plat-iop/cp6.c new file mode 100644 index 000000000000..9612a87e2a88 --- /dev/null +++ b/arch/arm/plat-iop/cp6.c @@ -0,0 +1,50 @@ +/* + * IOP Coprocessor-6 access handler + * Copyright (c) 2006, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + */ +#include <linux/init.h> +#include <asm/traps.h> + +static int cp6_trap(struct pt_regs *regs, unsigned int instr) +{ + u32 temp; + + /* enable cp6 access */ + asm volatile ( + "mrc p15, 0, %0, c15, c1, 0\n\t" + "orr %0, %0, #(1 << 6)\n\t" + "mcr p15, 0, %0, c15, c1, 0\n\t" + : "=r"(temp)); + + return 0; +} + +/* permit kernel space cp6 access + * deny user space cp6 access + */ +static struct undef_hook cp6_hook = { + .instr_mask = 0x0f000ff0, + .instr_val = 0x0e000610, + .cpsr_mask = MODE_MASK, + .cpsr_val = SVC_MODE, + .fn = cp6_trap, +}; + +void __init iop_init_cp6_handler(void) +{ + register_undef_hook(&cp6_hook); +} |