arch/arm/mach-msm/idle-macros.S

/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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.
 */

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

/* Add 300 NOPs after 'wfi' for 8x25 target */
.macro DELAY_8x25, rept
#ifdef CONFIG_ARCH_MSM8625
	.rept   \rept
	nop
	.endr
#endif
.endm

/* Switch between smp_to_amp/amp_to_smp configuration */
.macro SET_SMP_COHERENCY, on = 0
	ldr     r0, =target_type
	ldr     r0, [r0]
	mov     r1, #TARGET_IS_8625
	cmp     r0, r1
	bne     skip\@
	mrc	p15, 0, r0, c1, c0, 1	/* read ACTLR register */
	.if     \on
	orr	r0, r0, #(1 << 6)	/* Set the SMP bit in ACTLR */
	.else
	bic	r0, r0, #(1 << 6)	/* Clear the SMP bit */
	.endif
	mcr	p15, 0, r0, c1, c0, 1	/* write ACTLR register */
	isb
skip\@:
.endm

/*
 * Enable the "L2" cache, not require to restore the controller registers
 */
.macro ENABLE_8x25_L2
	ldr     r0, =target_type
	ldr     r0, [r0]
	mov     r1, #TARGET_IS_8625
	cmp     r0, r1
	bne     skip_enable\@
	ldr     r0, =apps_power_collapse
	ldr     r0, [r0]
	cmp     r0, #POWER_COLLAPSED
	bne     skip_enable\@
	ldr     r0, =l2x0_base_addr
	ldr	r0, [r0]
	mov	r1, #0x1
	str	r1, [r0, #L2X0_CTRL]
	dmb
skip_enable\@:
.endm

/*
 * Perform the required operation
 * operation: type of operation on l2 cache (e.g: clean&inv or inv)
 * l2_enable: enable or disable
 */
.macro DO_CACHE_OPERATION, operation, l2_enable
	ldr     r2, =l2x0_base_addr
	ldr	r2, [r2]
	ldr     r0, =0xffff
	str     r0, [r2, #\operation]
wait\@:
	ldr	r0, [r2, #\operation]
	ldr	r1, =0xffff
	ands    r0, r0, r1
	bne     wait\@
l2x_sync\@:
	mov	r0, #0x0
	str	r0, [r2, #L2X0_CACHE_SYNC]
sync\@:
	ldr	r0, [r2, #L2X0_CACHE_SYNC]
	ands	r0, r0, #0x1
	bne	sync\@
	mov     r1, #\l2_enable
	str     r1, [r2, #L2X0_CTRL]
.endm

/*
 * Clean and invalidate the L2 cache.
 * 1. Check the target type
 * 2. Check whether we are coming from PC are not
 * 3. Save 'aux', 'data latency', & 'prefetch ctlr' registers
 * 4. Start L2 clean & invalidation operation
 * 5. Disable the L2 cache
 */
.macro SUSPEND_8x25_L2
	ldr     r0, =target_type
	ldr     r0, [r0]
	mov     r1, #TARGET_IS_8625
	cmp     r0, r1
	bne     skip_suspend\@
	ldr	r0, =apps_power_collapse
	ldr	r0, [r0]
	cmp	r0, #POWER_COLLAPSED
	bne	skip_suspend\@
	ldr	r0, =l2x0_saved_ctrl_reg_val
	ldr	r1, =l2x0_base_addr
	ldr	r1, [r1]
	ldr	r2, [r1, #L2X0_AUX_CTRL]
	str	r2, [r0, #0x0] /* store aux_ctlr reg value */
	ldr     r2, [r1, #L2X0_DATA_LATENCY_CTRL]
	str     r2, [r0, #0x4] /* store data latency reg value */
	ldr     r2, [r1, #L2X0_PREFETCH_CTRL]
	str     r2, [r0, #0x8] /* store prefetch_ctlr reg value */
	DO_CACHE_OPERATION L2X0_CLEAN_INV_WAY OFF
	dmb
skip_suspend\@:
.endm

/*
 * Coming back from a successful PC
 * 1. Check the target type
 * 2. Check whether we are going to PC are not
 * 3. Disable the L2 cache
 * 4. Restore 'aux', 'data latency', & 'prefetch ctlr' reg
 * 5. Invalidate the cache
 * 6. Enable the L2 cache
 */
.macro RESUME_8x25_L2
	ldr     r0, =target_type
	ldr     r0, [r0]
	mov     r1, #TARGET_IS_8625
	cmp     r0, r1
	bne     skip_resume\@
	ldr	r0, =apps_power_collapse
	ldr	r0, [r0]
	cmp	r0, #POWER_COLLAPSED
	bne	skip_resume\@
	ldr     r1, =l2x0_base_addr
	ldr	r1, [r1]
	mov     r0, #0x0
	str     r0, [r1, #L2X0_CTRL]
	ldr     r0, =l2x0_saved_ctrl_reg_val
	ldr     r2, [r0, #0x0]
	str	r2, [r1, #L2X0_AUX_CTRL] /* restore aux_ctlr reg value */
	ldr	r2, [r0, #0x4]
	str	r2, [r1, #L2X0_DATA_LATENCY_CTRL]
	ldr	r2, [r0, #0x8]
	str     r2, [r1, #L2X0_PREFETCH_CTRL]
	DO_CACHE_OPERATION L2X0_INV_WAY ON
skip_resume\@:
.endm