70 lines
2 KiB
ArmAsm
70 lines
2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/* linux/arch/arm/plat-s3c64xx/sleep.S
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*
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* Copyright 2008 Openmoko, Inc.
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* Copyright 2008 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* S3C64XX CPU sleep code
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <mach/map.h>
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#undef S3C64XX_VA_GPIO
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#define S3C64XX_VA_GPIO (0x0)
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#include <mach/regs-gpio.h>
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#define LL_UART (S3C_PA_UART + (0x400 * CONFIG_S3C_LOWLEVEL_UART_PORT))
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.text
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/* Sleep magic, the word before the resume entry point so that the
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* bootloader can check for a resumeable image. */
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.word 0x2bedf00d
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/* s3c_cpu_reusme
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*
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* This is the entry point, stored by whatever method the bootloader
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* requires to get the kernel runnign again. This code expects to be
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* entered with no caches live and the MMU disabled. It will then
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* restore the MMU and other basic CP registers saved and restart
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* the kernel C code to finish the resume code.
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*/
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ENTRY(s3c_cpu_resume)
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msr cpsr_c, #PSR_I_BIT | PSR_F_BIT | SVC_MODE
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ldr r2, =LL_UART /* for debug */
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#ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
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#define S3C64XX_GPNCON (S3C64XX_GPN_BASE + 0x00)
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#define S3C64XX_GPNDAT (S3C64XX_GPN_BASE + 0x04)
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#define S3C64XX_GPN_CONMASK(__gpio) (0x3 << ((__gpio) * 2))
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#define S3C64XX_GPN_OUTPUT(__gpio) (0x1 << ((__gpio) * 2))
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/* Initialise the GPIO state if we are debugging via the SMDK LEDs,
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* as the uboot version supplied resets these to inputs during the
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* resume checks.
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*/
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ldr r3, =S3C64XX_PA_GPIO
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ldr r0, [ r3, #S3C64XX_GPNCON ]
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bic r0, r0, #(S3C64XX_GPN_CONMASK(12) | S3C64XX_GPN_CONMASK(13) | \
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S3C64XX_GPN_CONMASK(14) | S3C64XX_GPN_CONMASK(15))
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orr r0, r0, #(S3C64XX_GPN_OUTPUT(12) | S3C64XX_GPN_OUTPUT(13) | \
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S3C64XX_GPN_OUTPUT(14) | S3C64XX_GPN_OUTPUT(15))
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str r0, [ r3, #S3C64XX_GPNCON ]
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ldr r0, [ r3, #S3C64XX_GPNDAT ]
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bic r0, r0, #0xf << 12 @ GPN12..15
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orr r0, r0, #1 << 15 @ GPN15
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str r0, [ r3, #S3C64XX_GPNDAT ]
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#endif
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b cpu_resume
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