Commit 588ef769 authored by Dan Williams's avatar Dan Williams Committed by Russell King
Browse files

[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: default avatarDan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent dfc544c7

arch/arm/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -233,6 +233,8 @@ config ARCH_IOP33X 


config ARCH_IOP13XX

	bool "IOP13xx-based"

	depends on MMU

	select PLAT_IOP

	select PCI

	help

	  Support for Intel's IOP13XX (XScale) family of processors.

arch/arm/mach-iop13xx/irq.c

+3 −0
Original line number Diff line number Diff line
@@ -250,11 +250,14 @@ static struct irq_chip iop13xx_irqchip4 = { 
	.unmask = iop13xx_irq_unmask3,

};



extern void iop_init_cp6_handler(void);



void __init iop13xx_init_irq(void)

{

	unsigned int i;



	u32 cp_flags = iop13xx_cp6_save();

	iop_init_cp6_handler();



	/* disable all interrupts */

	write_intctl_0(0);

arch/arm/mach-iop32x/irq.c

+2 −0
Original line number Diff line number Diff line
@@ -60,6 +60,8 @@ void __init iop32x_init_irq(void) 
{

	int i;



	iop_init_cp6_handler();



	intctl_write(0);

	intstr_write(0);

	if (machine_is_glantank() ||

arch/arm/mach-iop33x/irq.c

+2 −0
Original line number Diff line number Diff line
@@ -110,6 +110,8 @@ void __init iop33x_init_irq(void) 
{

	int i;



	iop_init_cp6_handler();



	intctl0_write(0);

	intctl1_write(0);

	intstr0_write(0);

arch/arm/plat-iop/Makefile

+26 −4
Original line number Diff line number Diff line
@@ -2,7 +2,29 @@ 
# Makefile for the linux kernel.

#



obj-y			:= gpio.o i2c.o pci.o setup.o time.o io.o

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-                   :=

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