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---
r: 55035
b: refs/heads/master
c: 2e1ee1f
h: refs/heads/master
i:
  55033: 195def6
  55031: b241d07
v: v3
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Domen Puncer authored and Paul Mackerras committed May 7, 2007
1 parent de7974b commit cc83e97
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Showing 7 changed files with 402 additions and 1 deletion.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: a3481197783c187707090504062488862768260a
refs/heads/master: 2e1ee1f76684c5d4dd8e5a08cbf22d57f88769ed
2 changes: 2 additions & 0 deletions trunk/arch/powerpc/platforms/52xx/Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -8,3 +8,5 @@ endif

obj-$(CONFIG_PPC_EFIKA) += efika.o
obj-$(CONFIG_PPC_LITE5200) += lite5200.o

obj-$(CONFIG_PM) += mpc52xx_sleep.o mpc52xx_pm.o
15 changes: 15 additions & 0 deletions trunk/arch/powerpc/platforms/52xx/efika.c
Original file line number Diff line number Diff line change
Expand Up @@ -184,6 +184,16 @@ static void efika_show_cpuinfo(struct seq_file *m)
of_node_put(root);
}

#ifdef CONFIG_PM
static void efika_suspend_prepare(void __iomem *mbar)
{
u8 pin = 4; /* GPIO_WKUP_4 (GPIO_PSC6_0 - IRDA_RX) */
u8 level = 1; /* wakeup on high level */
/* IOW. to wake it up, short pins 1 and 3 on IRDA connector */
mpc52xx_set_wakeup_gpio(pin, level);
}
#endif

static void __init efika_setup_arch(void)
{
rtas_initialize();
Expand All @@ -199,6 +209,11 @@ static void __init efika_setup_arch(void)

efika_pcisetup();

#ifdef CONFIG_PM
mpc52xx_suspend.board_suspend_prepare = efika_suspend_prepare;
mpc52xx_pm_init();
#endif

if (ppc_md.progress)
ppc_md.progress("Linux/PPC " UTS_RELEASE " running on Efika ;-)\n", 0x0);
}
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28 changes: 28 additions & 0 deletions trunk/arch/powerpc/platforms/52xx/lite5200.c
Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,28 @@ lite5200_setup_cpu(void)
iounmap(gpio);
}

#ifdef CONFIG_PM
static u32 descr_a;
static void lite5200_suspend_prepare(void __iomem *mbar)
{
u8 pin = 1; /* GPIO_WKUP_1 (GPIO_PSC2_4) */
u8 level = 0; /* wakeup on low level */
mpc52xx_set_wakeup_gpio(pin, level);

/*
* power down usb port
* this needs to be called before of-ohci suspend code
*/
descr_a = in_be32(mbar + 0x1048);
out_be32(mbar + 0x1048, (descr_a & ~0x200) | 0x100);
}

static void lite5200_resume_finish(void __iomem *mbar)
{
out_be32(mbar + 0x1048, descr_a);
}
#endif

static void __init lite5200_setup_arch(void)
{
struct device_node *np;
Expand All @@ -107,6 +129,12 @@ static void __init lite5200_setup_arch(void)
mpc52xx_setup_cpu(); /* Generic */
lite5200_setup_cpu(); /* Platorm specific */

#ifdef CONFIG_PM
mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
mpc52xx_pm_init();
#endif

#ifdef CONFIG_PCI
np = of_find_node_by_type(NULL, "pci");
if (np) {
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191 changes: 191 additions & 0 deletions trunk/arch/powerpc/platforms/52xx/mpc52xx_pm.c
Original file line number Diff line number Diff line change
@@ -0,0 +1,191 @@
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/io.h>
#include <asm/time.h>
#include <asm/cacheflush.h>
#include <asm/mpc52xx.h>

#include "mpc52xx_pic.h"


/* these are defined in mpc52xx_sleep.S, and only used here */
extern void mpc52xx_deep_sleep(void *sram, void *sdram_regs,
struct mpc52xx_cdm *, struct mpc52xx_intr *);
extern void mpc52xx_ds_sram(void);
extern const long mpc52xx_ds_sram_size;
extern void mpc52xx_ds_cached(void);
extern const long mpc52xx_ds_cached_size;

static void __iomem *mbar;
static void __iomem *sdram;
static struct mpc52xx_cdm __iomem *cdm;
static struct mpc52xx_intr __iomem *intr;
static struct mpc52xx_gpio_wkup __iomem *gpiow;
static void *sram;
static int sram_size;

struct mpc52xx_suspend mpc52xx_suspend;

static int mpc52xx_pm_valid(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_STANDBY:
return 1;
default:
return 0;
}
}

int mpc52xx_set_wakeup_gpio(u8 pin, u8 level)
{
u16 tmp;

/* enable gpio */
out_8(&gpiow->wkup_gpioe, in_8(&gpiow->wkup_gpioe) | (1 << pin));
/* set as input */
out_8(&gpiow->wkup_ddr, in_8(&gpiow->wkup_ddr) & ~(1 << pin));
/* enable deep sleep interrupt */
out_8(&gpiow->wkup_inten, in_8(&gpiow->wkup_inten) | (1 << pin));
/* low/high level creates wakeup interrupt */
tmp = in_be16(&gpiow->wkup_itype);
tmp &= ~(0x3 << (pin * 2));
tmp |= (!level + 1) << (pin * 2);
out_be16(&gpiow->wkup_itype, tmp);
/* master enable */
out_8(&gpiow->wkup_maste, 1);

return 0;
}

int mpc52xx_pm_prepare(suspend_state_t state)
{
if (state != PM_SUSPEND_STANDBY)
return -EINVAL;

/* map the whole register space */
mbar = mpc52xx_find_and_map("mpc5200");
if (!mbar) {
printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__);
return -ENOSYS;
}
/* these offsets are from mpc5200 users manual */
sdram = mbar + 0x100;
cdm = mbar + 0x200;
intr = mbar + 0x500;
gpiow = mbar + 0xc00;
sram = mbar + 0x8000; /* Those will be handled by the */
sram_size = 0x4000; /* bestcomm driver soon */

/* call board suspend code, if applicable */
if (mpc52xx_suspend.board_suspend_prepare)
mpc52xx_suspend.board_suspend_prepare(mbar);
else {
printk(KERN_ALERT "%s: %i don't know how to wake up the board\n",
__func__, __LINE__);
goto out_unmap;
}

return 0;

out_unmap:
iounmap(mbar);
return -ENOSYS;
}


char saved_sram[0x4000];

int mpc52xx_pm_enter(suspend_state_t state)
{
u32 clk_enables;
u32 msr, hid0;
u32 intr_main_mask;
void __iomem * irq_0x500 = (void *)CONFIG_KERNEL_START + 0x500;
unsigned long irq_0x500_stop = (unsigned long)irq_0x500 + mpc52xx_ds_cached_size;
char saved_0x500[mpc52xx_ds_cached_size];

/* disable all interrupts in PIC */
intr_main_mask = in_be32(&intr->main_mask);
out_be32(&intr->main_mask, intr_main_mask | 0x1ffff);

/* don't let DEC expire any time soon */
mtspr(SPRN_DEC, 0x7fffffff);

/* save SRAM */
memcpy(saved_sram, sram, sram_size);

/* copy low level suspend code to sram */
memcpy(sram, mpc52xx_ds_sram, mpc52xx_ds_sram_size);

out_8(&cdm->ccs_sleep_enable, 1);
out_8(&cdm->osc_sleep_enable, 1);
out_8(&cdm->ccs_qreq_test, 1);

/* disable all but SDRAM and bestcomm (SRAM) clocks */
clk_enables = in_be32(&cdm->clk_enables);
out_be32(&cdm->clk_enables, clk_enables & 0x00088000);

/* disable power management */
msr = mfmsr();
mtmsr(msr & ~MSR_POW);

/* enable sleep mode, disable others */
hid0 = mfspr(SPRN_HID0);
mtspr(SPRN_HID0, (hid0 & ~(HID0_DOZE | HID0_NAP | HID0_DPM)) | HID0_SLEEP);

/* save original, copy our irq handler, flush from dcache and invalidate icache */
memcpy(saved_0x500, irq_0x500, mpc52xx_ds_cached_size);
memcpy(irq_0x500, mpc52xx_ds_cached, mpc52xx_ds_cached_size);
flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop);

/* call low-level sleep code */
mpc52xx_deep_sleep(sram, sdram, cdm, intr);

/* restore original irq handler */
memcpy(irq_0x500, saved_0x500, mpc52xx_ds_cached_size);
flush_icache_range((unsigned long)irq_0x500, irq_0x500_stop);

/* restore old power mode */
mtmsr(msr & ~MSR_POW);
mtspr(SPRN_HID0, hid0);
mtmsr(msr);

out_be32(&cdm->clk_enables, clk_enables);
out_8(&cdm->ccs_sleep_enable, 0);
out_8(&cdm->osc_sleep_enable, 0);

/* restore SRAM */
memcpy(sram, saved_sram, sram_size);

/* restart jiffies */
wakeup_decrementer();

/* reenable interrupts in PIC */
out_be32(&intr->main_mask, intr_main_mask);

return 0;
}

int mpc52xx_pm_finish(suspend_state_t state)
{
/* call board resume code */
if (mpc52xx_suspend.board_resume_finish)
mpc52xx_suspend.board_resume_finish(mbar);

iounmap(mbar);

return 0;
}

static struct pm_ops mpc52xx_pm_ops = {
.valid = mpc52xx_pm_valid,
.prepare = mpc52xx_pm_prepare,
.enter = mpc52xx_pm_enter,
.finish = mpc52xx_pm_finish,
};

int __init mpc52xx_pm_init(void)
{
pm_set_ops(&mpc52xx_pm_ops);
return 0;
}
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