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Commit 331d7475 authored by Ben Dooks's avatar Ben Dooks Committed by Linus Torvalds
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SM501: suspend support 



This patch adds support for suspending the core (mfd driver) of the SM501.

Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1ed8a2b3

drivers/mfd/sm501.c

+105 −8
Original line number Diff line number Diff line
@@ -41,6 +41,9 @@ struct sm501_devdata { 
	struct resource			*regs_claim;

	struct sm501_platdata		*platdata;



	unsigned int			 in_suspend;

	unsigned long			 pm_misc;



	int				 unit_power[20];

	unsigned int			 pdev_id;

	unsigned int			 irq;
@@ -169,10 +172,41 @@ x "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n", 
		fmt_freq(decode_div(pll2, pm1, 8,  1<<12, 15, misc_div)),

		fmt_freq(decode_div(pll2, pm1, 0,  1<<4,  15, misc_div)));

}

#else

static void sm501_dump_clk(struct sm501_devdata *sm)



static void sm501_dump_regs(struct sm501_devdata *sm)

{

	void __iomem *regs = sm->regs;



	dev_info(sm->dev, "System Control   %08x\n",

			readl(regs + SM501_SYSTEM_CONTROL));

	dev_info(sm->dev, "Misc Control     %08x\n",

			readl(regs + SM501_MISC_CONTROL));

	dev_info(sm->dev, "GPIO Control Low %08x\n",

			readl(regs + SM501_GPIO31_0_CONTROL));

	dev_info(sm->dev, "GPIO Control Hi  %08x\n",

			readl(regs + SM501_GPIO63_32_CONTROL));

	dev_info(sm->dev, "DRAM Control     %08x\n",

			readl(regs + SM501_DRAM_CONTROL));

	dev_info(sm->dev, "Arbitration Ctrl %08x\n",

			readl(regs + SM501_ARBTRTN_CONTROL));

	dev_info(sm->dev, "Misc Timing      %08x\n",

			readl(regs + SM501_MISC_TIMING));

}



static void sm501_dump_gate(struct sm501_devdata *sm)

{

	dev_info(sm->dev, "CurrentGate      %08x\n",

			readl(sm->regs + SM501_CURRENT_GATE));

	dev_info(sm->dev, "CurrentClock     %08x\n",

			readl(sm->regs + SM501_CURRENT_CLOCK));

	dev_info(sm->dev, "PowerModeControl %08x\n",

			readl(sm->regs + SM501_POWER_MODE_CONTROL));

}



#else

static inline void sm501_dump_gate(struct sm501_devdata *sm) { }

static inline void sm501_dump_regs(struct sm501_devdata *sm) { }

static inline void sm501_dump_clk(struct sm501_devdata *sm) { }

#endif



/* sm501_sync_regs
@@ -185,9 +219,21 @@ static void sm501_sync_regs(struct sm501_devdata *sm) 
	readl(sm->regs);

}



static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay)

{

	/* during suspend/resume, we are currently not allowed to sleep,

	 * so change to using mdelay() instead of msleep() if we

	 * are in one of these paths */



	if (sm->in_suspend)

		mdelay(delay);

	else

		msleep(delay);

}



/* sm501_misc_control

 *

 * alters the misceleneous control parameters

 * alters the miscellaneous control parameters

*/



int sm501_misc_control(struct device *dev,
@@ -368,7 +414,7 @@ int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to) 
	dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",

		gate, clock, mode);



	msleep(16);

	sm501_mdelay(sm, 16);



 already:

	mutex_unlock(&sm->clock_lock);
@@ -538,7 +584,7 @@ unsigned long sm501_set_clock(struct device *dev, 
	dev_info(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",

		 gate, clock, mode);



	msleep(16);

	sm501_mdelay(sm, 16);

	mutex_unlock(&sm->clock_lock);



	sm501_dump_clk(sm);
@@ -841,9 +887,7 @@ static int sm501_init_dev(struct sm501_devdata *sm) 
		 sm->regs, readl(sm->regs + SM501_DEVICEID),

		 (unsigned long)mem_avail >> 20, sm->irq);



	dev_info(sm->dev, "CurrentGate      %08x\n", readl(sm->regs+0x38));

	dev_info(sm->dev, "CurrentClock     %08x\n", readl(sm->regs+0x3c));

	dev_info(sm->dev, "PowerModeControl %08x\n", readl(sm->regs+0x54));

	sm501_dump_gate(sm);



	ret = device_create_file(sm->dev, &dev_attr_dbg_regs);

	if (ret)
@@ -933,6 +977,57 @@ static int sm501_plat_probe(struct platform_device *dev) 


}



#ifdef CONFIG_PM

/* power management support */



static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)

{

	struct sm501_devdata *sm = platform_get_drvdata(pdev);



	sm->in_suspend = 1;

	sm->pm_misc = readl(sm->regs + SM501_MISC_CONTROL);



	sm501_dump_regs(sm);

	return 0;

}



static int sm501_plat_resume(struct platform_device *pdev)

{

	struct sm501_devdata *sm = platform_get_drvdata(pdev);



	sm501_dump_regs(sm);

	sm501_dump_gate(sm);

	sm501_dump_clk(sm);



	/* check to see if we are in the same state as when suspended */



	if (readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {

		dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");

		writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);



		/* our suspend causes the controller state to change,

		 * either by something attempting setup, power loss,

		 * or an external reset event on power change */



		if (sm->platdata && sm->platdata->init) {

			sm501_init_regs(sm, sm->platdata->init);

		}

	}



	/* dump our state from resume */



	sm501_dump_regs(sm);

	sm501_dump_clk(sm);



	sm->in_suspend = 0;



	return 0;

}

#else

#define sm501_plat_suspend NULL

#define sm501_plat_resume NULL

#endif



/* Initialisation data for PCI devices */



static struct sm501_initdata sm501_pci_initdata = {
@@ -1126,6 +1221,8 @@ static struct platform_driver sm501_plat_drv = { 
	},

	.probe		= sm501_plat_probe,

	.remove		= sm501_plat_remove,

	.suspend	= sm501_plat_suspend,

	.resume		= sm501_plat_resume,

};



static int __init sm501_base_init(void)