[ARM] pxa: add preliminary suspend/resume code for pxa3xx

1. clear RDH bit after resuming back from D3, otherwise, the multi function
   pins will retain the low power state

2. save/restore essential system registers

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
eric miao 2008-01-28 23:00:02 +00:00 committed by Russell King
parent 16dfdbf038
commit c4d1fb627f
4 changed files with 183 additions and 14 deletions

View file

@ -22,6 +22,7 @@
#include <asm/hardware.h>
#include <asm/arch/mfp.h>
#include <asm/arch/mfp-pxa3xx.h>
#include <asm/arch/pxa3xx-regs.h>
/* mfp_spin_lock is used to ensure that MFP register configuration
* (most likely a read-modify-write operation) is atomic, and that
@ -223,6 +224,14 @@ static int pxa3xx_mfp_resume(struct sys_device *d)
struct pxa3xx_mfp_pin *p = &mfp_table[pin];
__mfp_config_run(p);
}
/* clear RDH bit when MFP settings are restored
*
* NOTE: the last 3 bits DxS are write-1-to-clear so carefully
* preserve them here in case they will be referenced later
*/
ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
return 0;
}

View file

@ -40,6 +40,7 @@
#define RO_CLK 60000000
#define ACCR_D0CS (1 << 26)
#define ACCR_PCCE (1 << 11)
/* crystal frequency to static memory controller multiplier (SMCFS) */
static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, };
@ -204,7 +205,6 @@ static struct clk pxa3xx_clks[] = {
};
#ifdef CONFIG_PM
#define SLEEP_SAVE_SIZE 4
#define ISRAM_START 0x5c000000
#define ISRAM_SIZE SZ_256K
@ -212,25 +212,29 @@ static struct clk pxa3xx_clks[] = {
static void __iomem *sram;
static unsigned long wakeup_src;
#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
enum { SLEEP_SAVE_START = 0,
SLEEP_SAVE_CKENA,
SLEEP_SAVE_CKENB,
SLEEP_SAVE_ACCR,
SLEEP_SAVE_SIZE,
};
static void pxa3xx_cpu_pm_save(unsigned long *sleep_save)
{
pr_debug("PM: CKENA=%08x CKENB=%08x\n", CKENA, CKENB);
if (CKENA & (1 << CKEN_USBH)) {
printk(KERN_ERR "PM: USB host clock not stopped?\n");
CKENA &= ~(1 << CKEN_USBH);
}
// CKENA |= 1 << (CKEN_ISC & 31);
/*
* Low power modes require the HSIO2 clock to be enabled.
*/
CKENB |= 1 << (CKEN_HSIO2 & 31);
SAVE(CKENA);
SAVE(CKENB);
SAVE(ACCR);
}
static void pxa3xx_cpu_pm_restore(unsigned long *sleep_save)
{
CKENB &= ~(1 << (CKEN_HSIO2 & 31));
RESTORE(ACCR);
RESTORE(CKENA);
RESTORE(CKENB);
}
/*
@ -266,6 +270,46 @@ static void pxa3xx_cpu_standby(unsigned int pwrmode)
printk("PM: AD2D0SR=%08x ASCR=%08x\n", AD2D0SR, ASCR);
}
/*
* NOTE: currently, the OBM (OEM Boot Module) binary comes along with
* PXA3xx development kits assumes that the resuming process continues
* with the address stored within the first 4 bytes of SDRAM. The PSPR
* register is used privately by BootROM and OBM, and _must_ be set to
* 0x5c014000 for the moment.
*/
static void pxa3xx_cpu_pm_suspend(void)
{
volatile unsigned long *p = (volatile void *)0xc0000000;
unsigned long saved_data = *p;
extern void pxa3xx_cpu_suspend(void);
extern void pxa3xx_cpu_resume(void);
/* resuming from D2 requires the HSIO2/BOOT/TPM clocks enabled */
CKENA |= (1 << CKEN_BOOT) | (1 << CKEN_TPM);
CKENB |= 1 << (CKEN_HSIO2 & 0x1f);
/* clear and setup wakeup source */
AD3SR = ~0;
AD3ER = wakeup_src;
ASCR = ASCR;
ARSR = ARSR;
PCFR |= (1u << 13); /* L1_DIS */
PCFR &= ~((1u << 12) | (1u << 1)); /* L0_EN | SL_ROD */
PSPR = 0x5c014000;
/* overwrite with the resume address */
*p = virt_to_phys(pxa3xx_cpu_resume);
pxa3xx_cpu_suspend();
*p = saved_data;
AD3ER = 0;
}
static void pxa3xx_cpu_pm_enter(suspend_state_t state)
{
/*
@ -280,6 +324,7 @@ static void pxa3xx_cpu_pm_enter(suspend_state_t state)
break;
case PM_SUSPEND_MEM:
pxa3xx_cpu_pm_suspend();
break;
}
}

View file

@ -50,6 +50,108 @@ pxa_cpu_save_sp:
str r0, [r1]
ldr pc, [sp], #4
#ifdef CONFIG_PXA3xx
/*
* pxa3xx_cpu_suspend() - forces CPU into sleep state (S2D3C4)
*
* NOTE: unfortunately, pxa_cpu_save_cp can not be reused here since
* the auxiliary control register address is different between pxa3xx
* and pxa{25x,27x}
*/
ENTRY(pxa3xx_cpu_suspend)
#ifndef CONFIG_IWMMXT
mra r2, r3, acc0
#endif
stmfd sp!, {r2 - r12, lr} @ save registers on stack
mrc p14, 0, r3, c6, c0, 0 @ clock configuration, for turbo mode
mrc p15, 0, r4, c15, c1, 0 @ CP access reg
mrc p15, 0, r5, c13, c0, 0 @ PID
mrc p15, 0, r6, c3, c0, 0 @ domain ID
mrc p15, 0, r7, c2, c0, 0 @ translation table base addr
mrc p15, 0, r8, c1, c0, 1 @ auxiliary control reg
mrc p15, 0, r9, c1, c0, 0 @ control reg
bic r3, r3, #2 @ clear frequency change bit
@ store them plus current virtual stack ptr on stack
mov r10, sp
stmfd sp!, {r3 - r10}
@ store physical address of stack pointer
mov r0, sp
bl sleep_phys_sp
ldr r1, =sleep_save_sp
str r0, [r1]
@ clean data cache
bl xsc3_flush_kern_cache_all
mov r0, #0x06 @ S2D3C4 mode
mcr p14, 0, r0, c7, c0, 0 @ enter sleep
20: b 20b @ waiting for sleep
.data
.align 5
/*
* pxa3xx_cpu_resume
*/
ENTRY(pxa3xx_cpu_resume)
mov r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE @ set SVC, irqs off
msr cpsr_c, r0
ldr r0, sleep_save_sp @ stack phys addr
ldmfd r0, {r3 - r9, sp} @ CP regs + virt stack ptr
mov r1, #0
mcr p15, 0, r1, c7, c7, 0 @ invalidate I & D caches, BTB
mcr p15, 0, r1, c7, c10, 4 @ drain write (&fill) buffer
mcr p15, 0, r1, c7, c5, 4 @ flush prefetch buffer
mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
mcr p14, 0, r3, c6, c0, 0 @ clock configuration, turbo mode.
mcr p15, 0, r4, c15, c1, 0 @ CP access reg
mcr p15, 0, r5, c13, c0, 0 @ PID
mcr p15, 0, r6, c3, c0, 0 @ domain ID
mcr p15, 0, r7, c2, c0, 0 @ translation table base addr
mcr p15, 0, r8, c1, c0, 1 @ auxiliary control reg
@ temporarily map resume_turn_on_mmu into the page table,
@ otherwise prefetch abort occurs after MMU is turned on
mov r1, r7
bic r1, r1, #0x00ff
bic r1, r1, #0x3f00
ldr r2, =0x542e
adr r3, resume_turn_on_mmu
mov r3, r3, lsr #20
orr r4, r2, r3, lsl #20
ldr r5, [r1, r3, lsl #2]
str r4, [r1, r3, lsl #2]
@ Mapping page table address in the page table
mov r6, r1, lsr #20
orr r7, r2, r6, lsl #20
ldr r8, [r1, r6, lsl #2]
str r7, [r1, r6, lsl #2]
ldr r2, =pxa3xx_resume_after_mmu @ absolute virtual address
b resume_turn_on_mmu @ cache align execution
.text
pxa3xx_resume_after_mmu:
/* restore the temporary mapping */
str r5, [r1, r3, lsl #2]
str r8, [r1, r6, lsl #2]
b resume_after_mmu
#endif /* CONFIG_PXA3xx */
#ifdef CONFIG_PXA27x
/*
* pxa27x_cpu_suspend()

View file

@ -12,6 +12,19 @@
#ifndef __ASM_ARCH_PXA3XX_REGS_H
#define __ASM_ARCH_PXA3XX_REGS_H
/*
* Service Power Management Unit (MPMU)
*/
#define PMCR __REG(0x40F50000) /* Power Manager Control Register */
#define PSR __REG(0x40F50004) /* Power Manager S2 Status Register */
#define PSPR __REG(0x40F50008) /* Power Manager Scratch Pad Register */
#define PCFR __REG(0x40F5000C) /* Power Manager General Configuration Register */
#define PWER __REG(0x40F50010) /* Power Manager Wake-up Enable Register */
#define PWSR __REG(0x40F50014) /* Power Manager Wake-up Status Register */
#define PECR __REG(0x40F50018) /* Power Manager EXT_WAKEUP[1:0] Control Register */
#define DCDCSR __REG(0x40F50080) /* DC-DC Controller Status Register */
#define PVCR __REG(0x40F50100) /* Power Manager Voltage Change Control Register */
#define PCMD(x) __REG(0x40F50110 + ((x) << 2))
/*
* Slave Power Managment Unit