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