[linux-2.6-block.git] / arch / arm / mach-imx / gpc.c

/*
 * Copyright 2011-2013 Freescale Semiconductor, Inc.
 * Copyright 2011 Linaro Ltd.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/regulator/consumer.h>
#include <linux/irqchip/arm-gic.h>
#include "common.h"
#include "hardware.h"

#define GPC_CNTR		0x000
#define GPC_IMR1		0x008
#define GPC_PGC_GPU_PDN		0x260
#define GPC_PGC_GPU_PUPSCR	0x264
#define GPC_PGC_GPU_PDNSCR	0x268
#define GPC_PGC_CPU_PDN		0x2a0
#define GPC_PGC_CPU_PUPSCR	0x2a4
#define GPC_PGC_CPU_PDNSCR	0x2a8
#define GPC_PGC_SW2ISO_SHIFT	0x8
#define GPC_PGC_SW_SHIFT	0x0

#define IMR_NUM			4
#define GPC_MAX_IRQS		(IMR_NUM * 32)

#define GPU_VPU_PUP_REQ		BIT(1)
#define GPU_VPU_PDN_REQ		BIT(0)

#define GPC_CLK_MAX		6

struct pu_domain {
	struct generic_pm_domain base;
	struct regulator *reg;
	struct clk *clk[GPC_CLK_MAX];
	int num_clks;
};

static void __iomem *gpc_base;
static u32 gpc_wake_irqs[IMR_NUM];
static u32 gpc_saved_imrs[IMR_NUM];

void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw)
{
	writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) |
		(sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PUPSCR);
}

void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw)
{
	writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) |
		(sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PDNSCR);
}

void imx_gpc_set_arm_power_in_lpm(bool power_off)
{
	writel_relaxed(power_off, gpc_base + GPC_PGC_CPU_PDN);
}

void imx_gpc_pre_suspend(bool arm_power_off)
{
	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	int i;

	/* Tell GPC to power off ARM core when suspend */
	if (arm_power_off)
		imx_gpc_set_arm_power_in_lpm(arm_power_off);

	for (i = 0; i < IMR_NUM; i++) {
		gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
		writel_relaxed(~gpc_wake_irqs[i], reg_imr1 + i * 4);
	}
}

void imx_gpc_post_resume(void)
{
	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	int i;

	/* Keep ARM core powered on for other low-power modes */
	imx_gpc_set_arm_power_in_lpm(false);

	for (i = 0; i < IMR_NUM; i++)
		writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
}

static int imx_gpc_irq_set_wake(struct irq_data *d, unsigned int on)
{
	unsigned int idx = d->hwirq / 32;
	u32 mask;

	mask = 1 << d->hwirq % 32;
	gpc_wake_irqs[idx] = on ? gpc_wake_irqs[idx] | mask :
				  gpc_wake_irqs[idx] & ~mask;

	/*
	 * Do *not* call into the parent, as the GIC doesn't have any
	 * wake-up facility...
	 */
	return 0;
}

void imx_gpc_mask_all(void)
{
	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	int i;

	for (i = 0; i < IMR_NUM; i++) {
		gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
		writel_relaxed(~0, reg_imr1 + i * 4);
	}

}

void imx_gpc_restore_all(void)
{
	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	int i;

	for (i = 0; i < IMR_NUM; i++)
		writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
}

void imx_gpc_hwirq_unmask(unsigned int hwirq)
{
	void __iomem *reg;
	u32 val;

	reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
	val = readl_relaxed(reg);
	val &= ~(1 << hwirq % 32);
	writel_relaxed(val, reg);
}

void imx_gpc_hwirq_mask(unsigned int hwirq)
{
	void __iomem *reg;
	u32 val;

	reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
	val = readl_relaxed(reg);
	val |= 1 << (hwirq % 32);
	writel_relaxed(val, reg);
}

static void imx_gpc_irq_unmask(struct irq_data *d)
{
	imx_gpc_hwirq_unmask(d->hwirq);
	irq_chip_unmask_parent(d);
}

static void imx_gpc_irq_mask(struct irq_data *d)
{
	imx_gpc_hwirq_mask(d->hwirq);
	irq_chip_mask_parent(d);
}

static struct irq_chip imx_gpc_chip = {
	.name			= "GPC",
	.irq_eoi		= irq_chip_eoi_parent,
	.irq_mask		= imx_gpc_irq_mask,
	.irq_unmask		= imx_gpc_irq_unmask,
	.irq_retrigger		= irq_chip_retrigger_hierarchy,
	.irq_set_wake		= imx_gpc_irq_set_wake,
#ifdef CONFIG_SMP
	.irq_set_affinity	= irq_chip_set_affinity_parent,
#endif
};

static int imx_gpc_domain_xlate(struct irq_domain *domain,
				struct device_node *controller,
				const u32 *intspec,
				unsigned int intsize,
				unsigned long *out_hwirq,
				unsigned int *out_type)
{
	if (domain->of_node != controller)
		return -EINVAL;	/* Shouldn't happen, really... */
	if (intsize != 3)
		return -EINVAL;	/* Not GIC compliant */
	if (intspec[0] != 0)
		return -EINVAL;	/* No PPI should point to this domain */

	*out_hwirq = intspec[1];
	*out_type = intspec[2];
	return 0;
}

static int imx_gpc_domain_alloc(struct irq_domain *domain,
				  unsigned int irq,
				  unsigned int nr_irqs, void *data)
{
	struct of_phandle_args *args = data;
	struct of_phandle_args parent_args;
	irq_hw_number_t hwirq;
	int i;

	if (args->args_count != 3)
		return -EINVAL;	/* Not GIC compliant */
	if (args->args[0] != 0)
		return -EINVAL;	/* No PPI should point to this domain */

	hwirq = args->args[1];
	if (hwirq >= GPC_MAX_IRQS)
		return -EINVAL;	/* Can't deal with this */

	for (i = 0; i < nr_irqs; i++)
		irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
					      &imx_gpc_chip, NULL);

	parent_args = *args;
	parent_args.np = domain->parent->of_node;
	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs, &parent_args);
}

static const struct irq_domain_ops imx_gpc_domain_ops = {
	.xlate	= imx_gpc_domain_xlate,
	.alloc	= imx_gpc_domain_alloc,
	.free	= irq_domain_free_irqs_common,
};

static int __init imx_gpc_init(struct device_node *node,
			       struct device_node *parent)
{
	struct irq_domain *parent_domain, *domain;
	int i;

	if (!parent) {
		pr_err("%s: no parent, giving up\n", node->full_name);
		return -ENODEV;
	}

	parent_domain = irq_find_host(parent);
	if (!parent_domain) {
		pr_err("%s: unable to obtain parent domain\n", node->full_name);
		return -ENXIO;
	}

	gpc_base = of_iomap(node, 0);
	if (WARN_ON(!gpc_base))
	        return -ENOMEM;

	domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
					  node, &imx_gpc_domain_ops,
					  NULL);
	if (!domain) {
		iounmap(gpc_base);
		return -ENOMEM;
	}

	/* Initially mask all interrupts */
	for (i = 0; i < IMR_NUM; i++)
		writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4);

	return 0;
}
IRQCHIP_DECLARE(imx_gpc, "fsl,imx6q-gpc", imx_gpc_init);

void __init imx_gpc_check_dt(void)
{
	struct device_node *np;

	np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpc");
	if (WARN_ON(!np))
		return;

	if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
		pr_warn("Outdated DT detected, suspend/resume will NOT work\n");

		/* map GPC, so that at least CPUidle and WARs keep working */
		gpc_base = of_iomap(np, 0);
	}
}

static void _imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
{
	int iso, iso2sw;
	u32 val;

	/* Read ISO and ISO2SW power down delays */
	val = readl_relaxed(gpc_base + GPC_PGC_GPU_PDNSCR);
	iso = val & 0x3f;
	iso2sw = (val >> 8) & 0x3f;

	/* Gate off PU domain when GPU/VPU when powered down */
	writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);

	/* Request GPC to power down GPU/VPU */
	val = readl_relaxed(gpc_base + GPC_CNTR);
	val |= GPU_VPU_PDN_REQ;
	writel_relaxed(val, gpc_base + GPC_CNTR);

	/* Wait ISO + ISO2SW IPG clock cycles */
	ndelay((iso + iso2sw) * 1000 / 66);
}

static int imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
{
	struct pu_domain *pu = container_of(genpd, struct pu_domain, base);

	_imx6q_pm_pu_power_off(genpd);

	if (pu->reg)
		regulator_disable(pu->reg);

	return 0;
}

static int imx6q_pm_pu_power_on(struct generic_pm_domain *genpd)
{
	struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
	int i, ret, sw, sw2iso;
	u32 val;

	if (pu->reg)
		ret = regulator_enable(pu->reg);
	if (pu->reg && ret) {
		pr_err("%s: failed to enable regulator: %d\n", __func__, ret);
		return ret;
	}

	/* Enable reset clocks for all devices in the PU domain */
	for (i = 0; i < pu->num_clks; i++)
		clk_prepare_enable(pu->clk[i]);

	/* Gate off PU domain when GPU/VPU when powered down */
	writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);

	/* Read ISO and ISO2SW power down delays */
	val = readl_relaxed(gpc_base + GPC_PGC_GPU_PUPSCR);
	sw = val & 0x3f;
	sw2iso = (val >> 8) & 0x3f;

	/* Request GPC to power up GPU/VPU */
	val = readl_relaxed(gpc_base + GPC_CNTR);
	val |= GPU_VPU_PUP_REQ;
	writel_relaxed(val, gpc_base + GPC_CNTR);

	/* Wait ISO + ISO2SW IPG clock cycles */
	ndelay((sw + sw2iso) * 1000 / 66);

	/* Disable reset clocks for all devices in the PU domain */
	for (i = 0; i < pu->num_clks; i++)
		clk_disable_unprepare(pu->clk[i]);

	return 0;
}

static struct generic_pm_domain imx6q_arm_domain = {
	.name = "ARM",
};

static struct pu_domain imx6q_pu_domain = {
	.base = {
		.name = "PU",
		.power_off = imx6q_pm_pu_power_off,
		.power_on = imx6q_pm_pu_power_on,
		.power_off_latency_ns = 25000,
		.power_on_latency_ns = 2000000,
	},
};

static struct generic_pm_domain imx6sl_display_domain = {
	.name = "DISPLAY",
};

static struct generic_pm_domain *imx_gpc_domains[] = {
	&imx6q_arm_domain,
	&imx6q_pu_domain.base,
	&imx6sl_display_domain,
};

static struct genpd_onecell_data imx_gpc_onecell_data = {
	.domains = imx_gpc_domains,
	.num_domains = ARRAY_SIZE(imx_gpc_domains),
};

static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg)
{
	struct clk *clk;
	int i;

	imx6q_pu_domain.reg = pu_reg;

	for (i = 0; ; i++) {
		clk = of_clk_get(dev->of_node, i);
		if (IS_ERR(clk))
			break;
		if (i >= GPC_CLK_MAX) {
			dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
			goto clk_err;
		}
		imx6q_pu_domain.clk[i] = clk;
	}
	imx6q_pu_domain.num_clks = i;

	/* Enable power always in case bootloader disabled it. */
	imx6q_pm_pu_power_on(&imx6q_pu_domain.base);

	if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
		return 0;

	pm_genpd_init(&imx6q_pu_domain.base, NULL, false);
	return of_genpd_add_provider_onecell(dev->of_node,
					     &imx_gpc_onecell_data);

clk_err:
	while (i--)
		clk_put(imx6q_pu_domain.clk[i]);
	return -EINVAL;
}

static int imx_gpc_probe(struct platform_device *pdev)
{
	struct regulator *pu_reg;
	int ret;

	/* bail out if DT too old and doesn't provide the necessary info */
	if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells"))
		return 0;

	pu_reg = devm_regulator_get_optional(&pdev->dev, "pu");
	if (PTR_ERR(pu_reg) == -ENODEV)
		pu_reg = NULL;
	if (IS_ERR(pu_reg)) {
		ret = PTR_ERR(pu_reg);
		dev_err(&pdev->dev, "failed to get pu regulator: %d\n", ret);
		return ret;
	}

	return imx_gpc_genpd_init(&pdev->dev, pu_reg);
}

static const struct of_device_id imx_gpc_dt_ids[] = {
	{ .compatible = "fsl,imx6q-gpc" },
	{ .compatible = "fsl,imx6sl-gpc" },
	{ }
};

static struct platform_driver imx_gpc_driver = {
	.driver = {
		.name = "imx-gpc",
		.of_match_table = imx_gpc_dt_ids,
	},
	.probe = imx_gpc_probe,
};

static int __init imx_pgc_init(void)
{
	return platform_driver_register(&imx_gpc_driver);
}
subsys_initcall(imx_pgc_init);
Commit	Line	Data
9fbbe689	1	/*
263475d4	2	* Copyright 2011-2013 Freescale Semiconductor, Inc.
9fbbe689 SG	3	* Copyright 2011 Linaro Ltd.
	4	*
	5	* The code contained herein is licensed under the GNU General Public
	6	* License. You may obtain a copy of the GNU General Public License
	7	* Version 2 or later at the following locations:
	8	*
	9	* http://www.opensource.org/licenses/gpl-license.html
	10	* http://www.gnu.org/copyleft/gpl.html
	11	*/
	12
00eb60a8 PZ	13	#include <linux/clk.h>
00eb60a8 PZ	14	#include <linux/delay.h>
9fbbe689 SG	15	#include <linux/io.h>
9fbbe689 SG	16	#include <linux/irq.h>
0cc09e85	17	#include <linux/irqchip.h>
9fbbe689 SG	18	#include <linux/of.h>
	19	#include <linux/of_address.h>
	20	#include <linux/of_irq.h>
00eb60a8 PZ	21	#include <linux/platform_device.h>
	22	#include <linux/pm_domain.h>
	23	#include <linux/regulator/consumer.h>
520f7bd7	24	#include <linux/irqchip/arm-gic.h>
9a67a6fd	25	#include "common.h"
00eb60a8	26	#include "hardware.h"
9fbbe689	27
00eb60a8	28	#define GPC_CNTR 0x000
9fbbe689	29	#define GPC_IMR1 0x008
00eb60a8 PZ	30	#define GPC_PGC_GPU_PDN 0x260
	31	#define GPC_PGC_GPU_PUPSCR 0x264
	32	#define GPC_PGC_GPU_PDNSCR 0x268
9fbbe689	33	#define GPC_PGC_CPU_PDN 0x2a0
05136f08 AH	34	#define GPC_PGC_CPU_PUPSCR 0x2a4
	35	#define GPC_PGC_CPU_PDNSCR 0x2a8
	36	#define GPC_PGC_SW2ISO_SHIFT 0x8
	37	#define GPC_PGC_SW_SHIFT 0x0
9fbbe689 SG	38
9fbbe689 SG	39	#define IMR_NUM 4
b923ff6a	40	#define GPC_MAX_IRQS (IMR_NUM * 32)
9fbbe689	41
00eb60a8 PZ	42	#define GPU_VPU_PUP_REQ BIT(1)
	43	#define GPU_VPU_PDN_REQ BIT(0)
	44
	45	#define GPC_CLK_MAX 6
	46
	47	struct pu_domain {
	48	struct generic_pm_domain base;
	49	struct regulator *reg;
	50	struct clk *clk[GPC_CLK_MAX];
	51	int num_clks;
	52	};
	53
9fbbe689 SG	54	static void __iomem *gpc_base;
	55	static u32 gpc_wake_irqs[IMR_NUM];
	56	static u32 gpc_saved_imrs[IMR_NUM];
	57
05136f08 AH	58	void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw)
	59	{
	60	writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) \|
	61	(sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PUPSCR);
	62	}
	63
	64	void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw)
	65	{
	66	writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) \|
	67	(sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PDNSCR);
	68	}
	69
	70	void imx_gpc_set_arm_power_in_lpm(bool power_off)
	71	{
	72	writel_relaxed(power_off, gpc_base + GPC_PGC_CPU_PDN);
	73	}
	74
80c0ecdc	75	void imx_gpc_pre_suspend(bool arm_power_off)
9fbbe689 SG	76	{
	77	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	78	int i;
	79
	80	/* Tell GPC to power off ARM core when suspend */
80c0ecdc	81	if (arm_power_off)
05136f08	82	imx_gpc_set_arm_power_in_lpm(arm_power_off);
9fbbe689 SG	83
	84	for (i = 0; i < IMR_NUM; i++) {
	85	gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
	86	writel_relaxed(~gpc_wake_irqs[i], reg_imr1 + i * 4);
	87	}
	88	}
	89
	90	void imx_gpc_post_resume(void)
	91	{
	92	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	93	int i;
	94
	95	/* Keep ARM core powered on for other low-power modes */
05136f08	96	imx_gpc_set_arm_power_in_lpm(false);
9fbbe689 SG	97
	98	for (i = 0; i < IMR_NUM; i++)
	99	writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
	100	}
	101
	102	static int imx_gpc_irq_set_wake(struct irq_data *d, unsigned int on)
	103	{
b923ff6a	104	unsigned int idx = d->hwirq / 32;
9fbbe689 SG	105	u32 mask;
9fbbe689 SG	106
e2fd06f6	107	mask = 1 << d->hwirq % 32;
9fbbe689 SG	108	gpc_wake_irqs[idx] = on ? gpc_wake_irqs[idx] \| mask :
	109	gpc_wake_irqs[idx] & ~mask;
	110
b923ff6a MZ	111	/*
	112	* Do not call into the parent, as the GIC doesn't have any
	113	* wake-up facility...
	114	*/
9fbbe689 SG	115	return 0;
	116	}
	117
263475d4 AH	118	void imx_gpc_mask_all(void)
	119	{
	120	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	121	int i;
	122
	123	for (i = 0; i < IMR_NUM; i++) {
	124	gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
	125	writel_relaxed(~0, reg_imr1 + i * 4);
	126	}
	127
	128	}
	129
	130	void imx_gpc_restore_all(void)
	131	{
	132	void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
	133	int i;
	134
	135	for (i = 0; i < IMR_NUM; i++)
	136	writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
	137	}
	138
65bb688a	139	void imx_gpc_hwirq_unmask(unsigned int hwirq)
9fbbe689 SG	140	{
	141	void __iomem *reg;
	142	u32 val;
	143
b923ff6a	144	reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
9fbbe689	145	val = readl_relaxed(reg);
65bb688a	146	val &= ~(1 << hwirq % 32);
9fbbe689 SG	147	writel_relaxed(val, reg);
	148	}
	149
65bb688a	150	void imx_gpc_hwirq_mask(unsigned int hwirq)
9fbbe689 SG	151	{
	152	void __iomem *reg;
	153	u32 val;
	154
b923ff6a	155	reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
65bb688a MZ	156	val = readl_relaxed(reg);
	157	val \|= 1 << (hwirq % 32);
	158	writel_relaxed(val, reg);
	159	}
	160
	161	static void imx_gpc_irq_unmask(struct irq_data *d)
	162	{
65bb688a	163	imx_gpc_hwirq_unmask(d->hwirq);
b923ff6a	164	irq_chip_unmask_parent(d);
65bb688a MZ	165	}
	166
	167	static void imx_gpc_irq_mask(struct irq_data *d)
	168	{
65bb688a	169	imx_gpc_hwirq_mask(d->hwirq);
b923ff6a	170	irq_chip_mask_parent(d);
9fbbe689 SG	171	}
9fbbe689 SG	172
b923ff6a	173	static struct irq_chip imx_gpc_chip = {
e33b6752 MZ	174	.name = "GPC",
	175	.irq_eoi = irq_chip_eoi_parent,
	176	.irq_mask = imx_gpc_irq_mask,
	177	.irq_unmask = imx_gpc_irq_unmask,
	178	.irq_retrigger = irq_chip_retrigger_hierarchy,
	179	.irq_set_wake = imx_gpc_irq_set_wake,
	180	#ifdef CONFIG_SMP
	181	.irq_set_affinity = irq_chip_set_affinity_parent,
	182	#endif
b923ff6a MZ	183	};
	184
	185	static int imx_gpc_domain_xlate(struct irq_domain *domain,
	186	struct device_node *controller,
	187	const u32 *intspec,
	188	unsigned int intsize,
	189	unsigned long *out_hwirq,
	190	unsigned int *out_type)
9fbbe689	191	{
b923ff6a MZ	192	if (domain->of_node != controller)
	193	return -EINVAL; /* Shouldn't happen, really... */
	194	if (intsize != 3)
	195	return -EINVAL; /* Not GIC compliant */
	196	if (intspec[0] != 0)
	197	return -EINVAL; /* No PPI should point to this domain */
	198
	199	*out_hwirq = intspec[1];
	200	*out_type = intspec[2];
	201	return 0;
	202	}
	203
	204	static int imx_gpc_domain_alloc(struct irq_domain *domain,
	205	unsigned int irq,
	206	unsigned int nr_irqs, void *data)
	207	{
	208	struct of_phandle_args *args = data;
	209	struct of_phandle_args parent_args;
	210	irq_hw_number_t hwirq;
485863b8	211	int i;
9fbbe689	212
b923ff6a MZ	213	if (args->args_count != 3)
	214	return -EINVAL; /* Not GIC compliant */
	215	if (args->args[0] != 0)
	216	return -EINVAL; /* No PPI should point to this domain */
	217
	218	hwirq = args->args[1];
	219	if (hwirq >= GPC_MAX_IRQS)
	220	return -EINVAL; /* Can't deal with this */
	221
	222	for (i = 0; i < nr_irqs; i++)
	223	irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
	224	&imx_gpc_chip, NULL);
	225
	226	parent_args = *args;
	227	parent_args.np = domain->parent->of_node;
	228	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs, &parent_args);
	229	}
	230
9b589a83	231	static const struct irq_domain_ops imx_gpc_domain_ops = {
b923ff6a MZ	232	.xlate = imx_gpc_domain_xlate,
	233	.alloc = imx_gpc_domain_alloc,
	234	.free = irq_domain_free_irqs_common,
	235	};
	236
	237	static int __init imx_gpc_init(struct device_node *node,
	238	struct device_node *parent)
	239	{
	240	struct irq_domain parent_domain, domain;
	241	int i;
	242
	243	if (!parent) {
	244	pr_err("%s: no parent, giving up\n", node->full_name);
	245	return -ENODEV;
	246	}
	247
	248	parent_domain = irq_find_host(parent);
	249	if (!parent_domain) {
	250	pr_err("%s: unable to obtain parent domain\n", node->full_name);
	251	return -ENXIO;
	252	}
	253
	254	gpc_base = of_iomap(node, 0);
	255	if (WARN_ON(!gpc_base))
	256	return -ENOMEM;
	257
	258	domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
	259	node, &imx_gpc_domain_ops,
	260	NULL);
	261	if (!domain) {
	262	iounmap(gpc_base);
	263	return -ENOMEM;
	264	}
9fbbe689	265
485863b8 SG	266	/* Initially mask all interrupts */
	267	for (i = 0; i < IMR_NUM; i++)
	268	writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4);
	269
b923ff6a	270	return 0;
9fbbe689	271	}
0cc09e85	272	IRQCHIP_DECLARE(imx_gpc, "fsl,imx6q-gpc", imx_gpc_init);
b923ff6a	273
14517564 MZ	274	void __init imx_gpc_check_dt(void)
	275	{
	276	struct device_node *np;
	277
	278	np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpc");
634a6037 LS	279	if (WARN_ON(!np))
	280	return;
	281
	282	if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
	283	pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
	284
	285	/* map GPC, so that at least CPUidle and WARs keep working */
	286	gpc_base = of_iomap(np, 0);
	287	}
14517564 MZ	288	}
14517564 MZ	289
00eb60a8 PZ	290	static void _imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
	291	{
	292	int iso, iso2sw;
	293	u32 val;
	294
	295	/* Read ISO and ISO2SW power down delays */
	296	val = readl_relaxed(gpc_base + GPC_PGC_GPU_PDNSCR);
	297	iso = val & 0x3f;
	298	iso2sw = (val >> 8) & 0x3f;
	299
	300	/* Gate off PU domain when GPU/VPU when powered down */
	301	writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
	302
	303	/* Request GPC to power down GPU/VPU */
	304	val = readl_relaxed(gpc_base + GPC_CNTR);
	305	val \|= GPU_VPU_PDN_REQ;
	306	writel_relaxed(val, gpc_base + GPC_CNTR);
	307
	308	/* Wait ISO + ISO2SW IPG clock cycles */
	309	ndelay((iso + iso2sw) * 1000 / 66);
	310	}
	311
	312	static int imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
	313	{
	314	struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
	315
	316	_imx6q_pm_pu_power_off(genpd);
	317
	318	if (pu->reg)
	319	regulator_disable(pu->reg);
	320
	321	return 0;
	322	}
	323
	324	static int imx6q_pm_pu_power_on(struct generic_pm_domain *genpd)
	325	{
	326	struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
	327	int i, ret, sw, sw2iso;
	328	u32 val;
	329
	330	if (pu->reg)
	331	ret = regulator_enable(pu->reg);
	332	if (pu->reg && ret) {
	333	pr_err("%s: failed to enable regulator: %d\n", __func__, ret);
	334	return ret;
	335	}
	336
	337	/* Enable reset clocks for all devices in the PU domain */
	338	for (i = 0; i < pu->num_clks; i++)
	339	clk_prepare_enable(pu->clk[i]);
	340
	341	/* Gate off PU domain when GPU/VPU when powered down */
	342	writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
	343
	344	/* Read ISO and ISO2SW power down delays */
	345	val = readl_relaxed(gpc_base + GPC_PGC_GPU_PUPSCR);
	346	sw = val & 0x3f;
	347	sw2iso = (val >> 8) & 0x3f;
	348
	349	/* Request GPC to power up GPU/VPU */
	350	val = readl_relaxed(gpc_base + GPC_CNTR);
	351	val \|= GPU_VPU_PUP_REQ;
	352	writel_relaxed(val, gpc_base + GPC_CNTR);
	353
354	/* Wait ISO + ISO2SW IPG clock cycles */
355	ndelay((sw + sw2iso) * 1000 / 66);
356
357	/* Disable reset clocks for all devices in the PU domain */
358	for (i = 0; i < pu->num_clks; i++)
359	clk_disable_unprepare(pu->clk[i]);
360
361	return 0;
362	}
363
364	static struct generic_pm_domain imx6q_arm_domain = {
365	.name = "ARM",
366	};
367
368	static struct pu_domain imx6q_pu_domain = {
369	.base = {
370	.name = "PU",
371	.power_off = imx6q_pm_pu_power_off,
372	.power_on = imx6q_pm_pu_power_on,
373	.power_off_latency_ns = 25000,
374	.power_on_latency_ns = 2000000,
375	},
376	};
377
378	static struct generic_pm_domain imx6sl_display_domain = {
379	.name = "DISPLAY",
380	};
381
382	static struct generic_pm_domain *imx_gpc_domains[] = {
383	&imx6q_arm_domain,
384	&imx6q_pu_domain.base,
385	&imx6sl_display_domain,
386	};
387
388	static struct genpd_onecell_data imx_gpc_onecell_data = {
389	.domains = imx_gpc_domains,
390	.num_domains = ARRAY_SIZE(imx_gpc_domains),
391	};
392
393	static int imx_gpc_genpd_init(struct device dev, struct regulator pu_reg)
394	{
395	struct clk *clk;
00eb60a8 PZ	396	int i;
	397
	398	imx6q_pu_domain.reg = pu_reg;
	399
	400	for (i = 0; ; i++) {
	401	clk = of_clk_get(dev->of_node, i);
	402	if (IS_ERR(clk))
	403	break;
	404	if (i >= GPC_CLK_MAX) {
	405	dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
	406	goto clk_err;
	407	}
	408	imx6q_pu_domain.clk[i] = clk;
	409	}
	410	imx6q_pu_domain.num_clks = i;
	411
d438462c LS	412	/* Enable power always in case bootloader disabled it. */
	413	imx6q_pm_pu_power_on(&imx6q_pu_domain.base);
	414
	415	if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
	416	return 0;
00eb60a8	417
d438462c	418	pm_genpd_init(&imx6q_pu_domain.base, NULL, false);
00eb60a8 PZ	419	return of_genpd_add_provider_onecell(dev->of_node,
	420	&imx_gpc_onecell_data);
	421
	422	clk_err:
	423	while (i--)
	424	clk_put(imx6q_pu_domain.clk[i]);
	425	return -EINVAL;
	426	}
	427
00eb60a8 PZ	428	static int imx_gpc_probe(struct platform_device *pdev)
	429	{
	430	struct regulator *pu_reg;
	431	int ret;
	432
b17c70cd LS	433	/* bail out if DT too old and doesn't provide the necessary info */
	434	if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells"))
	435	return 0;
	436
00eb60a8 PZ	437	pu_reg = devm_regulator_get_optional(&pdev->dev, "pu");
	438	if (PTR_ERR(pu_reg) == -ENODEV)
	439	pu_reg = NULL;
	440	if (IS_ERR(pu_reg)) {
	441	ret = PTR_ERR(pu_reg);
	442	dev_err(&pdev->dev, "failed to get pu regulator: %d\n", ret);
	443	return ret;
	444	}
	445
	446	return imx_gpc_genpd_init(&pdev->dev, pu_reg);
	447	}
	448
	449	static const struct of_device_id imx_gpc_dt_ids[] = {
	450	{ .compatible = "fsl,imx6q-gpc" },
	451	{ .compatible = "fsl,imx6sl-gpc" },
	452	{ }
	453	};
	454
	455	static struct platform_driver imx_gpc_driver = {
	456	.driver = {
	457	.name = "imx-gpc",
00eb60a8 PZ	458	.of_match_table = imx_gpc_dt_ids,
	459	},
	460	.probe = imx_gpc_probe,
	461	};
	462
	463	static int __init imx_pgc_init(void)
	464	{
	465	return platform_driver_register(&imx_gpc_driver);
	466	}
	467	subsys_initcall(imx_pgc_init);