From: John Lenz <[email protected]>
This adds low-level suspend/resume support to locomo.c.
Signed-off-by: Pavel Machek <[email protected]>
diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
--- a/arch/arm/common/locomo.c
+++ b/arch/arm/common/locomo.c
@@ -541,6 +541,103 @@ locomo_init_one_child(struct locomo *lch
return ret;
}
+#ifdef CONFIG_PM
+
+struct locomo_save_data {
+ u16 LCM_GPO;
+ u16 LCM_SPICT;
+ u16 LCM_GPE;
+ u16 LCM_ASD;
+ u16 LCM_SPIMD;
+};
+
+static int locomo_suspend(struct device *dev, u32 pm_message_t, u32 level)
+{
+ struct locomo *lchip = dev_get_drvdata(dev);
+ struct locomo_save_data *save;
+ unsigned long flags;
+
+ if (level != SUSPEND_DISABLE)
+ return 0;
+
+ save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
+ if (!save)
+ return -ENOMEM;
+
+ dev->power.saved_state = (void *) save;
+
+ spin_lock_irqsave(&lchip->lock, flags);
+
+ save->LCM_GPO = locomo_readl(lchip->base + LOCOMO_GPO); /* GPIO */
+ locomo_writel(0x00, lchip->base + LOCOMO_GPO);
+ save->LCM_SPICT = locomo_readl(lchip->base + LOCOMO_SPICT); /* SPI */
+ locomo_writel(0x40, lchip->base + LOCOMO_SPICT);
+ save->LCM_GPE = locomo_readl(lchip->base + LOCOMO_GPE); /* GPIO */
+ locomo_writel(0x00, lchip->base + LOCOMO_GPE);
+ save->LCM_ASD = locomo_readl(lchip->base + LOCOMO_ASD); /* ADSTART */
+ locomo_writel(0x00, lchip->base + LOCOMO_ASD);
+ save->LCM_SPIMD = locomo_readl(lchip->base + LOCOMO_SPIMD); /* SPI */
+ locomo_writel(0x3C14, lchip->base + LOCOMO_SPIMD);
+
+ locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
+ locomo_writel(0x00, lchip->base + LOCOMO_DAC);
+ locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
+
+ if ( (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88) )
+ locomo_writel(0x00, lchip->base + LOCOMO_C32K); /* CLK32 off */
+ else
+ /* 18MHz already enabled, so no wait */
+ locomo_writel(0xc1, lchip->base + LOCOMO_C32K); /* CLK32 on */
+
+ locomo_writel(0x00, lchip->base + LOCOMO_TADC); /* 18MHz clock off*/
+ locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC); /* 22MHz/24MHz clock off */
+ locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS); /* FL */
+
+ spin_unlock_irqrestore(&lchip->lock, flags);
+
+ return 0;
+}
+
+static int locomo_resume(struct device *dev, u32 level)
+{
+ struct locomo *lchip = dev_get_drvdata(dev);
+ struct locomo_save_data *save;
+ unsigned long r;
+ unsigned long flags;
+
+ if (level != RESUME_ENABLE)
+ return 0;
+
+ save = (struct locomo_save_data *) dev->power.saved_state;
+ if (!save)
+ return 0;
+
+ spin_lock_irqsave(&lchip->lock, flags);
+
+ locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
+ locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPICT);
+ locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
+ locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
+ locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPIMD);
+
+ locomo_writel(0x00, lchip->base + LOCOMO_C32K);
+ locomo_writel(0x90, lchip->base + LOCOMO_TADC);
+
+ locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
+ r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
+ r &= 0xFEFF;
+ locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
+ locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
+
+ spin_unlock_irqrestore(&lchip->lock, flags);
+
+ dev->power.saved_state = NULL;
+ kfree(save);
+
+ return 0;
+}
+#endif
+
/**
* locomo_probe - probe for a single LoCoMo chip.
* @phys_addr: physical address of device.
@@ -707,6 +810,10 @@ static struct device_driver locomo_devic
.bus = &platform_bus_type,
.probe = locomo_probe,
.remove = locomo_remove,
+#ifdef CONFIG_PM
+ .suspend = locomo_suspend,
+ .resume = locomo_resume,
+#endif
};
/*
--
teflon -- maybe it is a trademark, but it should not be.
-
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