denver.S

/*
 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <arch.h>
#include <asm_macros.S>
#include <assert_macros.S>
#include <denver.h>
#include <cpu_macros.S>
#include <plat_macros.S>

	/* ---------------------------------------------
	 * Disable debug interfaces
	 * ---------------------------------------------
	 */
func denver_disable_ext_debug
	mov	x0, #1
	msr	osdlr_el1, x0
	isb
	dsb	sy
	ret
endfunc denver_disable_ext_debug

	/* ----------------------------------------------------
	 * Enable dynamic code optimizer (DCO)
	 * ----------------------------------------------------
	 */
func denver_enable_dco
	mrs	x0, mpidr_el1
	and	x0, x0, #0xF
	mov	x1, #1
	lsl	x1, x1, x0
	msr	s3_0_c15_c0_2, x1
	isb
	ret
endfunc denver_enable_dco

	/* ----------------------------------------------------
	 * Disable dynamic code optimizer (DCO)
	 * ----------------------------------------------------
	 */
func denver_disable_dco

	/* turn off background work */
	mrs	x0, mpidr_el1
	and	x0, x0, #0xF
	mov	x1, #1
	lsl	x1, x1, x0
	lsl	x2, x1, #16
	msr	s3_0_c15_c0_2, x2
	isb

	/* wait till the background work turns off */
1:	mrs	x2, s3_0_c15_c0_2
	lsr	x2, x2, #32
	and	w2, w2, 0xFFFF
	and	x2, x2, x1
	cbnz	x2, 1b

	ret
endfunc denver_disable_dco

	/* -------------------------------------------------
	 * The CPU Ops reset function for Denver.
	 * -------------------------------------------------
	 */
func denver_reset_func

	mov	x19, x30

	/* ----------------------------------------------------
	 * Enable dynamic code optimizer (DCO)
	 * ----------------------------------------------------
	 */
	bl	denver_enable_dco

	ret	x19
endfunc denver_reset_func

	/* ----------------------------------------------------
	 * The CPU Ops core power down function for Denver.
	 * ----------------------------------------------------
	 */
func denver_core_pwr_dwn

	mov	x19, x30

	/* ----------------------------------------------------
	 * We enter the 'core power gated with ARM state not
	 * retained' power state during CPU power down. We let
	 * DCO know that we expect to enter this power state
	 * by writing to the ACTLR_EL1 register.
 	 * ----------------------------------------------------
 	 */
	mov	x0, #DENVER_CPU_STATE_POWER_DOWN
	msr	actlr_el1, x0

	/* ---------------------------------------------
	 * Force DCO to be quiescent
	 * ---------------------------------------------
	 */
	bl	denver_disable_dco

	/* ---------------------------------------------
	 * Force the debug interfaces to be quiescent
	 * ---------------------------------------------
	 */
	bl	denver_disable_ext_debug

	ret	x19
endfunc denver_core_pwr_dwn

	/* -------------------------------------------------------
	 * The CPU Ops cluster power down function for Denver.
	 * -------------------------------------------------------
	 */
func denver_cluster_pwr_dwn
	ret
endfunc denver_cluster_pwr_dwn

	/* ---------------------------------------------
	 * This function provides Denver specific
	 * register information for crash reporting.
	 * It needs to return with x6 pointing to
	 * a list of register names in ascii and
	 * x8 - x15 having values of registers to be
	 * reported.
	 * ---------------------------------------------
	 */
.section .rodata.denver_regs, "aS"
denver_regs:  /* The ascii list of register names to be reported */
	.asciz	"actlr_el1", ""

func denver_cpu_reg_dump
	adr	x6, denver_regs
	mrs	x8, ACTLR_EL1
	ret
endfunc denver_cpu_reg_dump

declare_cpu_ops denver, DENVER_1_0_MIDR, \
	denver_reset_func, \
	denver_core_pwr_dwn, \
	denver_cluster_pwr_dwn