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