code: 9ferno

ref: 83246e296ea433b65b9d295b5e08fedd39ff1ab7
dir: /os/sa1110/suspend.c/

#include	"u.h"
#include	"../port/lib.h"
#include	"mem.h"
#include	"dat.h"
#include	"fns.h"
#include	"io.h"
#include	"ureg.h"

/*
 * Originally written by nemo@gsyc.escet.urjc.es, and
 * reworked by forsyth@vitanuova.com
 */
enum {
	DEBUG = 0,
};

/*
 * TO DO: pcmcia, lcd properly
 */

/*
 * it's not clear yet whether we should do it this way,
 * or using powerenable/powerdisable
 */
void
chandevpower(int up)
{
	int i;

	if(up){
		for(i=0; devtab[i] != nil; i++)
			if(devtab[i]->power != nil)
				devtab[i]->power(1);
	}else{
		/* power down in reverse order */
		for(i=0; devtab[i] != nil; i++)
			;
		while(--i >= 0)
			if(devtab[i]->power != nil)
				devtab[i]->power(0);
	}
}

static void
dumpitall(void)
{
	iprint("intr: icip %lux iclr %lux iccr %lux icmr %lux\n",
		INTRREG->icip,
		INTRREG->iclr, INTRREG->iccr, INTRREG->icmr );
	iprint("gpio: lvl %lux dir %lux, re %lux, fe %lux sts %lux alt %lux\n",
		GPIOREG->gplr,
		GPIOREG->gpdr, GPIOREG->grer, GPIOREG->gfer,
		GPIOREG->gpsr, GPIOREG->gafr);
	iprint("uart1: %lux %lux %lux\nuart3: %lux %lux %lux\n", 
		UARTREG(1)->utcr0, UARTREG(1)->utsr0, UARTREG(1)->utsr1, 
		UARTREG(3)->utcr0, UARTREG(3)->utsr0, UARTREG(3)->utsr1); 
	iprint("tmr: osmr %lux %lux %lux %lux oscr %lux ossr %lux oier %lux\n",
		OSTMRREG->osmr[0], OSTMRREG->osmr[1],
		OSTMRREG->osmr[2], OSTMRREG->osmr[3],
		OSTMRREG->oscr, OSTMRREG->ossr, OSTMRREG->oier);
	iprint("dram: mdcnfg %lux mdrefr %lux cas %lux %lux %lux %lux %lux %lux\n",
		MEMCFGREG->mdcnfg, MEMCFGREG->mdrefr,
		MEMCFGREG->mdcas0[0], MEMCFGREG->mdcas0[1],MEMCFGREG->mdcas0[2],
		MEMCFGREG->mdcas2[0], MEMCFGREG->mdcas2[1],MEMCFGREG->mdcas2[2]); 
	iprint("dram: mdcnfg msc %lux %lux %lux mecr %lux\n",
		MEMCFGREG->msc0, MEMCFGREG->msc1,MEMCFGREG->msc2,
		MEMCFGREG->mecr);
}

static ulong *coreregs[] = {
	/* can't trust the bootstrap to put these back */
	&MEMCFGREG->mecr,
	&MEMCFGREG->msc0,
	&MEMCFGREG->msc1,
	&MEMCFGREG->msc2,

	&PPCREG->ppdr,
	&PPCREG->ppsr,	/* should save? */
	&PPCREG->ppar,
	&PPCREG->psdr,

	&GPIOREG->grer,
	&GPIOREG->gfer,
	&GPIOREG->gafr,
	&GPIOREG->gpdr,
	/* gplr handled specially */

	&GPCLKREG->gpclkr1,
	&GPCLKREG->gpclkr2,
	&GPCLKREG->gpclkr0,

	&OSTMRREG->osmr[0],
	&OSTMRREG->osmr[1],
	&OSTMRREG->osmr[2],
	&OSTMRREG->osmr[3],
	&OSTMRREG->oscr,
	&OSTMRREG->oier,
	/* skip ower */

	&INTRREG->iclr,
	&INTRREG->iccr,
	&INTRREG->icmr,	/* interrupts enabled */

	nil,
};

static ulong corestate[nelem(coreregs)];

void
powersuspend(void)
{
	extern void suspenditall(void);
	GpioReg *g;
	ulong back = 0x43219990;	/* check that the stack's right */
	ulong pwer, gplr;
	ulong *rp;
	int i, s;

	s = splfhi();
	archpowerdown();	/* sets PMGR and PPC appropriately */
	if(DEBUG)
		dumpitall();
	blankscreen(1);
	chandevpower(0);
	gplr = GPIOREG->gplr;
	for(i=0; (rp = coreregs[i]) != nil; i++)
		corestate[i] = *rp;
	pwer = PMGRREG->pwer;
	if(pwer == 0)
		pwer = 1<<0;
	g = GPIOREG;
	g->grer &= pwer;	/* just the ones archpowerdown requested */
	g->gfer &= pwer;
	g->gedr = g->gedr;
	RESETREG->rcsr = 0xF;	/* reset all status */
	minidcflush();
	if(DEBUG)
		iprint("suspenditall...\n");

	suspenditall();	/* keep us in suspense */

	PMGRREG->pspr = 0;
	archpowerup();
	trapstacks();
	/* set output latches before gpdr restored */
	GPIOREG->gpsr = gplr;
	GPIOREG->gpcr = ~gplr;
	for(i=0; (rp = coreregs[i]) != nil; i++)
		*rp = corestate[i];
	GPIOREG->gedr = GPIOREG->gedr;	/* reset GPIO interrupts (should we?) */
	PMGRREG->pssr = PSSR_ph;	/* cancel peripheral hold */
	chandevpower(1);
	if(back != 0x43219990){
		iprint("back %8.8lux\n", back);
		panic("powersuspend");
	}
	blankscreen(0);
	if(DEBUG)
		dumpitall();
	splx(s);
}