196 lines
4.8 KiB
ArmAsm
196 lines
4.8 KiB
ArmAsm
/*
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* linux/arch/arm/mach-pnx4008/sleep.S
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*
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* PNX4008 support for STOP mode and SDRAM self-refresh
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*
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* Authors: Dmitry Chigirev, Vitaly Wool <source@mvista.com>
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*
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* 2005 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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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/hardware.h>
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#define PWRMAN_VA_BASE IO_ADDRESS(PNX4008_PWRMAN_BASE)
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#define PWR_CTRL_REG_OFFS 0x44
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#define SDRAM_CFG_VA_BASE IO_ADDRESS(PNX4008_SDRAM_CFG_BASE)
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#define MPMC_STATUS_REG_OFFS 0x4
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.text
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ENTRY(pnx4008_cpu_suspend)
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@this function should be entered in Direct run mode.
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@ save registers on stack
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stmfd sp!, {r0 - r6, lr}
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@ setup Power Manager base address in r4
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@ and put it's value in r5
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mov r4, #(PWRMAN_VA_BASE & 0xff000000)
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orr r4, r4, #(PWRMAN_VA_BASE & 0x00ff0000)
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orr r4, r4, #(PWRMAN_VA_BASE & 0x0000ff00)
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orr r4, r4, #(PWRMAN_VA_BASE & 0x000000ff)
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ldr r5, [r4, #PWR_CTRL_REG_OFFS]
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@ setup SDRAM controller base address in r2
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@ and put it's value in r3
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mov r2, #(SDRAM_CFG_VA_BASE & 0xff000000)
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orr r2, r2, #(SDRAM_CFG_VA_BASE & 0x00ff0000)
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orr r2, r2, #(SDRAM_CFG_VA_BASE & 0x0000ff00)
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orr r2, r2, #(SDRAM_CFG_VA_BASE & 0x000000ff)
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ldr r3, [r2, #MPMC_STATUS_REG_OFFS] @extra read - HW bug workaround
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@ clear SDRAM self-refresh bit latch
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and r5, r5, #(~(1 << 8))
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@ clear SDRAM self-refresh bit
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and r5, r5, #(~(1 << 9))
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ do save current bit settings in r1
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mov r1, r5
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@ set SDRAM self-refresh bit
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orr r5, r5, #(1 << 9)
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ set SDRAM self-refresh bit latch
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orr r5, r5, #(1 << 8)
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ clear SDRAM self-refresh bit latch
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and r5, r5, #(~(1 << 8))
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ clear SDRAM self-refresh bit
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and r5, r5, #(~(1 << 9))
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ wait for SDRAM to get into self-refresh mode
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2: ldr r3, [r2, #MPMC_STATUS_REG_OFFS]
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tst r3, #(1 << 2)
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beq 2b
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@ to prepare SDRAM to get out of self-refresh mode after wakeup
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orr r5, r5, #(1 << 7)
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ do enter stop mode
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orr r5, r5, #(1 << 0)
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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@ sleeping now...
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@ coming out of STOP mode into Direct Run mode
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@ clear STOP mode and SDRAM self-refresh bits
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str r1, [r4, #PWR_CTRL_REG_OFFS]
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@ wait for SDRAM to get out self-refresh mode
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3: ldr r3, [r2, #MPMC_STATUS_REG_OFFS]
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tst r3, #5
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bne 3b
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@ restore regs and return
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ldmfd sp!, {r0 - r6, pc}
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ENTRY(pnx4008_cpu_suspend_sz)
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.word . - pnx4008_cpu_suspend
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ENTRY(pnx4008_cpu_standby)
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@ save registers on stack
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stmfd sp!, {r0 - r6, lr}
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@ setup Power Manager base address in r4
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@ and put it's value in r5
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mov r4, #(PWRMAN_VA_BASE & 0xff000000)
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orr r4, r4, #(PWRMAN_VA_BASE & 0x00ff0000)
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orr r4, r4, #(PWRMAN_VA_BASE & 0x0000ff00)
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orr r4, r4, #(PWRMAN_VA_BASE & 0x000000ff)
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ldr r5, [r4, #PWR_CTRL_REG_OFFS]
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@ setup SDRAM controller base address in r2
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@ and put it's value in r3
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mov r2, #(SDRAM_CFG_VA_BASE & 0xff000000)
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orr r2, r2, #(SDRAM_CFG_VA_BASE & 0x00ff0000)
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orr r2, r2, #(SDRAM_CFG_VA_BASE & 0x0000ff00)
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orr r2, r2, #(SDRAM_CFG_VA_BASE & 0x000000ff)
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ldr r3, [r2, #MPMC_STATUS_REG_OFFS] @extra read - HW bug workaround
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@ clear SDRAM self-refresh bit latch
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and r5, r5, #(~(1 << 8))
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@ clear SDRAM self-refresh bit
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and r5, r5, #(~(1 << 9))
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ do save current bit settings in r1
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mov r1, r5
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@ set SDRAM self-refresh bit
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orr r5, r5, #(1 << 9)
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ set SDRAM self-refresh bit latch
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orr r5, r5, #(1 << 8)
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ clear SDRAM self-refresh bit latch
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and r5, r5, #(~(1 << 8))
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ clear SDRAM self-refresh bit
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and r5, r5, #(~(1 << 9))
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ wait for SDRAM to get into self-refresh mode
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2: ldr r3, [r2, #MPMC_STATUS_REG_OFFS]
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tst r3, #(1 << 2)
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beq 2b
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@ set 'get out of self-refresh mode after wakeup' bit
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orr r5, r5, #(1 << 7)
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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mcr p15, 0, r0, c7, c0, 4 @ kinda sleeping now...
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@ set SDRAM self-refresh bit latch
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orr r5, r5, #(1 << 8)
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ clear SDRAM self-refresh bit latch
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and r5, r5, #(~(1 << 8))
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str r5, [r4, #PWR_CTRL_REG_OFFS]
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@ wait for SDRAM to get out self-refresh mode
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3: ldr r3, [r2, #MPMC_STATUS_REG_OFFS]
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tst r3, #5
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bne 3b
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@ restore regs and return
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ldmfd sp!, {r0 - r6, pc}
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ENTRY(pnx4008_cpu_standby_sz)
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.word . - pnx4008_cpu_standby
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ENTRY(pnx4008_cache_clean_invalidate)
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stmfd sp!, {r0 - r6, lr}
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#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
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mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
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#else
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1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
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bne 1b
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#endif
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ldmfd sp!, {r0 - r6, pc}
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