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Commit de7e7532 authored by Russell King's avatar Russell King
Browse files

ARM: l2c: provide common PL310 early resume code 



Provide a common assembly implementation for PL310 resume code.  Certain
platforms need to re-initialise the L2C cache early as it may preserve
data across a S2RAM cycle, and therefore must be enabled along with the
L1 cache and MMU.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 805604ef

arch/arm/mm/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -97,6 +97,6 @@ AFLAGS_proc-v7.o :=-Wa,-march=armv7-a 


obj-$(CONFIG_OUTER_CACHE)	+= l2c-common.o

obj-$(CONFIG_CACHE_FEROCEON_L2)	+= cache-feroceon-l2.o

obj-$(CONFIG_CACHE_L2X0)	+= cache-l2x0.o

obj-$(CONFIG_CACHE_L2X0)	+= cache-l2x0.o l2c-l2x0-resume.o

obj-$(CONFIG_CACHE_XSC3L2)	+= cache-xsc3l2.o

obj-$(CONFIG_CACHE_TAUROS2)	+= cache-tauros2.o

arch/arm/mm/l2c-l2x0-resume.S

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+58 −0
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/*

 * L2C-310 early resume code.  This can be used by platforms to restore

 * the settings of their L2 cache controller before restoring the

 * processor state.

 *

 * This code can only be used to if you are running in the secure world.

 */

#include <linux/linkage.h>

#include <asm/hardware/cache-l2x0.h>



	.text



ENTRY(l2c310_early_resume)

	adr	r0, 1f

	ldr	r2, [r0]

	add	r0, r2, r0



	ldmia	r0, {r1, r2, r3, r4, r5, r6, r7, r8}

	@ r1 = phys address of L2C-310 controller

	@ r2 = aux_ctrl

	@ r3 = tag_latency

	@ r4 = data_latency

	@ r5 = filter_start

	@ r6 = filter_end

	@ r7 = prefetch_ctrl

	@ r8 = pwr_ctrl



	@ Check that the address has been initialised

	teq	r1, #0

	moveq	pc, lr



	@ The prefetch and power control registers are revision dependent

	@ and can be written whether or not the L2 cache is enabled

	ldr	r0, [r1, #L2X0_CACHE_ID]

	and	r0, r0, #L2X0_CACHE_ID_RTL_MASK

	cmp	r0, #L310_CACHE_ID_RTL_R2P0

	strcs	r7, [r1, #L310_PREFETCH_CTRL]

	cmp	r0, #L310_CACHE_ID_RTL_R3P0

	strcs	r8, [r1, #L310_POWER_CTRL]



	@ Don't setup the L2 cache if it is already enabled

	ldr	r0, [r1, #L2X0_CTRL]

	tst	r0, #L2X0_CTRL_EN

	movne	pc, lr



	str	r3, [r1, #L310_TAG_LATENCY_CTRL]

	str	r4, [r1, #L310_DATA_LATENCY_CTRL]

	str	r6, [r1, #L310_ADDR_FILTER_END]

	str	r5, [r1, #L310_ADDR_FILTER_START]



	str	r2, [r1, #L2X0_AUX_CTRL]

	mov	r9, #L2X0_CTRL_EN

	str	r9, [r1, #L2X0_CTRL]

	mov	pc, lr

ENDPROC(l2c310_early_resume)



	.align

1:	.long	l2x0_saved_regs - .