arch/powerpc/platforms/52xx/lite5200_pm.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 #include <linux/init.h>
 #include <linux/suspend.h>
 #include <linux/of_address.h>

 #include <asm/io.h>
 #include <asm/time.h>
 #include <asm/mpc52xx.h>
 #include <asm/switch_to.h>

 /* defined in lite5200_sleep.S and only used here */
 extern void lite5200_low_power(void __iomem *sram, void __iomem *mbar);

 static struct mpc52xx_cdm __iomem *cdm;
 static struct mpc52xx_intr __iomem *pic;
 static struct mpc52xx_sdma __iomem *bes;
 static struct mpc52xx_xlb __iomem *xlb;
 static struct mpc52xx_gpio __iomem *gps;
 static struct mpc52xx_gpio_wkup __iomem *gpw;
 static void __iomem *pci;
 static void __iomem *sram;
 static const int sram_size = 0x4000;	/* 16 kBytes */
 static void __iomem *mbar;

 static suspend_state_t lite5200_pm_target_state;

 static int lite5200_pm_valid(suspend_state_t state)
 {
 	switch (state) {
 	case PM_SUSPEND_STANDBY:
 	case PM_SUSPEND_MEM:
 		return 1;
 	default:
 		return 0;
 	}
 }

 static int lite5200_pm_begin(suspend_state_t state)
 {
 	if (lite5200_pm_valid(state)) {
 		lite5200_pm_target_state = state;
 		return 0;
 	}
 	return -EINVAL;
 }

 static int lite5200_pm_prepare(void)
 {
 	struct device_node *np;
 	const struct of_device_id immr_ids[] = {
 		{ .compatible = "fsl,mpc5200-immr", },
 		{ .compatible = "fsl,mpc5200b-immr", },
 		{ .type = "soc", .compatible = "mpc5200", }, /* lite5200 */
 		{ .type = "builtin", .compatible = "mpc5200", }, /* efika */
 		{}
 	};
 	u64 regaddr64 = 0;
 	const u32 *regaddr_p;

 	/* deep sleep? let mpc52xx code handle that */
 	if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
 		return mpc52xx_pm_prepare();

 	if (lite5200_pm_target_state != PM_SUSPEND_MEM)
 		return -EINVAL;

 	/* map registers */
 	np = of_find_matching_node(NULL, immr_ids);
 	regaddr_p = of_get_address(np, 0, NULL, NULL);
 	if (regaddr_p)
 		regaddr64 = of_translate_address(np, regaddr_p);
 	of_node_put(np);

 	mbar = ioremap((u32) regaddr64, 0xC000);
 	if (!mbar) {
 		printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__);
 		return -ENOSYS;
 	}

 	cdm = mbar + 0x200;
 	pic = mbar + 0x500;
 	gps = mbar + 0xb00;
 	gpw = mbar + 0xc00;
 	pci = mbar + 0xd00;
 	bes = mbar + 0x1200;
 	xlb = mbar + 0x1f00;
 	sram = mbar + 0x8000;

 	return 0;
 }

 /* save and restore registers not bound to any real devices */
 static struct mpc52xx_cdm scdm;
 static struct mpc52xx_intr spic;
 static struct mpc52xx_sdma sbes;
 static struct mpc52xx_xlb sxlb;
 static struct mpc52xx_gpio sgps;
 static struct mpc52xx_gpio_wkup sgpw;
 static char spci[0x200];

 static void lite5200_save_regs(void)
 {
 	_memcpy_fromio(&spic, pic, sizeof(*pic));
 	_memcpy_fromio(&sbes, bes, sizeof(*bes));
 	_memcpy_fromio(&scdm, cdm, sizeof(*cdm));
 	_memcpy_fromio(&sxlb, xlb, sizeof(*xlb));
 	_memcpy_fromio(&sgps, gps, sizeof(*gps));
 	_memcpy_fromio(&sgpw, gpw, sizeof(*gpw));
 	_memcpy_fromio(spci, pci, 0x200);

 	_memcpy_fromio(saved_sram, sram, sram_size);
 }

 static void lite5200_restore_regs(void)
 {
 	int i;
 	_memcpy_toio(sram, saved_sram, sram_size);

 	/* PCI Configuration */
 	_memcpy_toio(pci, spci, 0x200);

 	/*
 	 * GPIOs. Interrupt Master Enable has higher address then other
 	 * registers, so just memcpy is ok.
 	 */
 	_memcpy_toio(gpw, &sgpw, sizeof(*gpw));
 	_memcpy_toio(gps, &sgps, sizeof(*gps));


 	/* XLB Arbitrer */
 	out_be32(&xlb->snoop_window, sxlb.snoop_window);
 	out_be32(&xlb->master_priority, sxlb.master_priority);
 	out_be32(&xlb->master_pri_enable, sxlb.master_pri_enable);

 	/* enable */
 	out_be32(&xlb->int_enable, sxlb.int_enable);
 	out_be32(&xlb->config, sxlb.config);


 	/* CDM - Clock Distribution Module */
 	out_8(&cdm->ipb_clk_sel, scdm.ipb_clk_sel);
 	out_8(&cdm->pci_clk_sel, scdm.pci_clk_sel);

 	out_8(&cdm->ext_48mhz_en, scdm.ext_48mhz_en);
 	out_8(&cdm->fd_enable, scdm.fd_enable);
 	out_be16(&cdm->fd_counters, scdm.fd_counters);

 	out_be32(&cdm->clk_enables, scdm.clk_enables);

 	out_8(&cdm->osc_disable, scdm.osc_disable);

 	out_be16(&cdm->mclken_div_psc1, scdm.mclken_div_psc1);
 	out_be16(&cdm->mclken_div_psc2, scdm.mclken_div_psc2);
 	out_be16(&cdm->mclken_div_psc3, scdm.mclken_div_psc3);
 	out_be16(&cdm->mclken_div_psc6, scdm.mclken_div_psc6);


 	/* BESTCOMM */
 	out_be32(&bes->taskBar, sbes.taskBar);
 	out_be32(&bes->currentPointer, sbes.currentPointer);
 	out_be32(&bes->endPointer, sbes.endPointer);
 	out_be32(&bes->variablePointer, sbes.variablePointer);

 	out_8(&bes->IntVect1, sbes.IntVect1);
 	out_8(&bes->IntVect2, sbes.IntVect2);
 	out_be16(&bes->PtdCntrl, sbes.PtdCntrl);

 	for (i=0; i<32; i++)
 		out_8(&bes->ipr[i], sbes.ipr[i]);

 	out_be32(&bes->cReqSelect, sbes.cReqSelect);
 	out_be32(&bes->task_size0, sbes.task_size0);
 	out_be32(&bes->task_size1, sbes.task_size1);
 	out_be32(&bes->MDEDebug, sbes.MDEDebug);
 	out_be32(&bes->ADSDebug, sbes.ADSDebug);
 	out_be32(&bes->Value1, sbes.Value1);
 	out_be32(&bes->Value2, sbes.Value2);
 	out_be32(&bes->Control, sbes.Control);
 	out_be32(&bes->Status, sbes.Status);
 	out_be32(&bes->PTDDebug, sbes.PTDDebug);

 	/* restore tasks */
 	for (i=0; i<16; i++)
 		out_be16(&bes->tcr[i], sbes.tcr[i]);

 	/* enable interrupts */
 	out_be32(&bes->IntPend, sbes.IntPend);
 	out_be32(&bes->IntMask, sbes.IntMask);


 	/* PIC */
 	out_be32(&pic->per_pri1, spic.per_pri1);
 	out_be32(&pic->per_pri2, spic.per_pri2);
 	out_be32(&pic->per_pri3, spic.per_pri3);

 	out_be32(&pic->main_pri1, spic.main_pri1);
 	out_be32(&pic->main_pri2, spic.main_pri2);

 	out_be32(&pic->enc_status, spic.enc_status);

 	/* unmask and enable interrupts */
 	out_be32(&pic->per_mask, spic.per_mask);
 	out_be32(&pic->main_mask, spic.main_mask);
 	out_be32(&pic->ctrl, spic.ctrl);
 }

 static int lite5200_pm_enter(suspend_state_t state)
 {
 	/* deep sleep? let mpc52xx code handle that */
 	if (state == PM_SUSPEND_STANDBY) {
 		return mpc52xx_pm_enter(state);
 	}

 	lite5200_save_regs();

 	/* effectively save FP regs */
 	enable_kernel_fp();

 	lite5200_low_power(sram, mbar);

 	lite5200_restore_regs();

 	iounmap(mbar);
 	return 0;
 }

 static void lite5200_pm_finish(void)
 {
 	/* deep sleep? let mpc52xx code handle that */
 	if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
 		mpc52xx_pm_finish();
 }

 static void lite5200_pm_end(void)
 {
 	lite5200_pm_target_state = PM_SUSPEND_ON;
 }

 static const struct platform_suspend_ops lite5200_pm_ops = {
 	.valid		= lite5200_pm_valid,
 	.begin		= lite5200_pm_begin,
 	.prepare	= lite5200_pm_prepare,
 	.enter		= lite5200_pm_enter,
 	.finish		= lite5200_pm_finish,
 	.end		= lite5200_pm_end,
 };

 int __init lite5200_pm_init(void)
 {
 	suspend_set_ops(&lite5200_pm_ops);
 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0
	#include <linux/init.h>
	#include <linux/suspend.h>
	#include <linux/of_address.h>

	#include <asm/io.h>
	#include <asm/time.h>
	#include <asm/mpc52xx.h>
	#include <asm/switch_to.h>

	/* defined in lite5200_sleep.S and only used here */
	extern void lite5200_low_power(void __iomem sram, void __iomem mbar);

	static struct mpc52xx_cdm __iomem *cdm;
	static struct mpc52xx_intr __iomem *pic;
	static struct mpc52xx_sdma __iomem *bes;
	static struct mpc52xx_xlb __iomem *xlb;
	static struct mpc52xx_gpio __iomem *gps;
	static struct mpc52xx_gpio_wkup __iomem *gpw;
	static void __iomem *pci;
	static void __iomem *sram;
	static const int sram_size = 0x4000; /* 16 kBytes */
	static void __iomem *mbar;

	static suspend_state_t lite5200_pm_target_state;

	static int lite5200_pm_valid(suspend_state_t state)
	{
	switch (state) {
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
	return 1;
	default:
	return 0;
	}
	}

	static int lite5200_pm_begin(suspend_state_t state)
	{
	if (lite5200_pm_valid(state)) {
	lite5200_pm_target_state = state;
	return 0;
	}
	return -EINVAL;
	}

	static int lite5200_pm_prepare(void)
	{
	struct device_node *np;
	const struct of_device_id immr_ids[] = {
	{ .compatible = "fsl,mpc5200-immr", },
	{ .compatible = "fsl,mpc5200b-immr", },
	{ .type = "soc", .compatible = "mpc5200", }, /* lite5200 */
	{ .type = "builtin", .compatible = "mpc5200", }, /* efika */
	{}
	};
	u64 regaddr64 = 0;
	const u32 *regaddr_p;

	/* deep sleep? let mpc52xx code handle that */
	if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
	return mpc52xx_pm_prepare();

	if (lite5200_pm_target_state != PM_SUSPEND_MEM)
	return -EINVAL;

	/* map registers */
	np = of_find_matching_node(NULL, immr_ids);
	regaddr_p = of_get_address(np, 0, NULL, NULL);
	if (regaddr_p)
	regaddr64 = of_translate_address(np, regaddr_p);
	of_node_put(np);

	mbar = ioremap((u32) regaddr64, 0xC000);
	if (!mbar) {
	printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__);
	return -ENOSYS;
	}

	cdm = mbar + 0x200;
	pic = mbar + 0x500;
	gps = mbar + 0xb00;
	gpw = mbar + 0xc00;
	pci = mbar + 0xd00;
	bes = mbar + 0x1200;
	xlb = mbar + 0x1f00;
	sram = mbar + 0x8000;

	return 0;
	}

	/* save and restore registers not bound to any real devices */
	static struct mpc52xx_cdm scdm;
	static struct mpc52xx_intr spic;
	static struct mpc52xx_sdma sbes;
	static struct mpc52xx_xlb sxlb;
	static struct mpc52xx_gpio sgps;
	static struct mpc52xx_gpio_wkup sgpw;
	static char spci[0x200];

	static void lite5200_save_regs(void)
	{
	_memcpy_fromio(&spic, pic, sizeof(*pic));
	_memcpy_fromio(&sbes, bes, sizeof(*bes));
	_memcpy_fromio(&scdm, cdm, sizeof(*cdm));
	_memcpy_fromio(&sxlb, xlb, sizeof(*xlb));
	_memcpy_fromio(&sgps, gps, sizeof(*gps));
	_memcpy_fromio(&sgpw, gpw, sizeof(*gpw));
	_memcpy_fromio(spci, pci, 0x200);

	_memcpy_fromio(saved_sram, sram, sram_size);
	}

	static void lite5200_restore_regs(void)
	{
	int i;
	_memcpy_toio(sram, saved_sram, sram_size);

	/* PCI Configuration */
	_memcpy_toio(pci, spci, 0x200);

	/*
	* GPIOs. Interrupt Master Enable has higher address then other
	* registers, so just memcpy is ok.
	*/
	_memcpy_toio(gpw, &sgpw, sizeof(*gpw));
	_memcpy_toio(gps, &sgps, sizeof(*gps));


	/* XLB Arbitrer */
	out_be32(&xlb->snoop_window, sxlb.snoop_window);
	out_be32(&xlb->master_priority, sxlb.master_priority);
	out_be32(&xlb->master_pri_enable, sxlb.master_pri_enable);

	/* enable */
	out_be32(&xlb->int_enable, sxlb.int_enable);
	out_be32(&xlb->config, sxlb.config);


	/* CDM - Clock Distribution Module */
	out_8(&cdm->ipb_clk_sel, scdm.ipb_clk_sel);
	out_8(&cdm->pci_clk_sel, scdm.pci_clk_sel);

	out_8(&cdm->ext_48mhz_en, scdm.ext_48mhz_en);
	out_8(&cdm->fd_enable, scdm.fd_enable);
	out_be16(&cdm->fd_counters, scdm.fd_counters);

	out_be32(&cdm->clk_enables, scdm.clk_enables);

	out_8(&cdm->osc_disable, scdm.osc_disable);

	out_be16(&cdm->mclken_div_psc1, scdm.mclken_div_psc1);
	out_be16(&cdm->mclken_div_psc2, scdm.mclken_div_psc2);
	out_be16(&cdm->mclken_div_psc3, scdm.mclken_div_psc3);
	out_be16(&cdm->mclken_div_psc6, scdm.mclken_div_psc6);


	/* BESTCOMM */
	out_be32(&bes->taskBar, sbes.taskBar);
	out_be32(&bes->currentPointer, sbes.currentPointer);
	out_be32(&bes->endPointer, sbes.endPointer);
	out_be32(&bes->variablePointer, sbes.variablePointer);

	out_8(&bes->IntVect1, sbes.IntVect1);
	out_8(&bes->IntVect2, sbes.IntVect2);
	out_be16(&bes->PtdCntrl, sbes.PtdCntrl);

	for (i=0; i<32; i++)
	out_8(&bes->ipr[i], sbes.ipr[i]);

	out_be32(&bes->cReqSelect, sbes.cReqSelect);
	out_be32(&bes->task_size0, sbes.task_size0);
	out_be32(&bes->task_size1, sbes.task_size1);
	out_be32(&bes->MDEDebug, sbes.MDEDebug);
	out_be32(&bes->ADSDebug, sbes.ADSDebug);
	out_be32(&bes->Value1, sbes.Value1);
	out_be32(&bes->Value2, sbes.Value2);
	out_be32(&bes->Control, sbes.Control);
	out_be32(&bes->Status, sbes.Status);
	out_be32(&bes->PTDDebug, sbes.PTDDebug);

	/* restore tasks */
	for (i=0; i<16; i++)
	out_be16(&bes->tcr[i], sbes.tcr[i]);

	/* enable interrupts */
	out_be32(&bes->IntPend, sbes.IntPend);
	out_be32(&bes->IntMask, sbes.IntMask);


	/* PIC */
	out_be32(&pic->per_pri1, spic.per_pri1);
	out_be32(&pic->per_pri2, spic.per_pri2);
	out_be32(&pic->per_pri3, spic.per_pri3);

	out_be32(&pic->main_pri1, spic.main_pri1);
	out_be32(&pic->main_pri2, spic.main_pri2);

	out_be32(&pic->enc_status, spic.enc_status);

	/* unmask and enable interrupts */
	out_be32(&pic->per_mask, spic.per_mask);
	out_be32(&pic->main_mask, spic.main_mask);
	out_be32(&pic->ctrl, spic.ctrl);
	}

	static int lite5200_pm_enter(suspend_state_t state)
	{
	/* deep sleep? let mpc52xx code handle that */
	if (state == PM_SUSPEND_STANDBY) {
	return mpc52xx_pm_enter(state);
	}

	lite5200_save_regs();

	/* effectively save FP regs */
	enable_kernel_fp();

	lite5200_low_power(sram, mbar);

	lite5200_restore_regs();

	iounmap(mbar);
	return 0;
	}

	static void lite5200_pm_finish(void)
	{
	/* deep sleep? let mpc52xx code handle that */
	if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
	mpc52xx_pm_finish();
	}

	static void lite5200_pm_end(void)
	{
	lite5200_pm_target_state = PM_SUSPEND_ON;
	}

	static const struct platform_suspend_ops lite5200_pm_ops = {
	.valid = lite5200_pm_valid,
	.begin = lite5200_pm_begin,
	.prepare = lite5200_pm_prepare,
	.enter = lite5200_pm_enter,
	.finish = lite5200_pm_finish,
	.end = lite5200_pm_end,
	};

	int __init lite5200_pm_init(void)
	{
	suspend_set_ops(&lite5200_pm_ops);
	return 0;
	}