[linux-block.git] / drivers / mfd / bcm2835-pm.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * PM MFD driver for Broadcom BCM2835
 *
 * This driver binds to the PM block and creates the MFD device for
 * the WDT and power drivers.
 */

#include <linux/delay.h>
#include <linux/io.h>
#include <linux/mfd/bcm2835-pm.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/watchdog.h>

static const struct mfd_cell bcm2835_pm_devs[] = {
	{ .name = "bcm2835-wdt" },
};

static const struct mfd_cell bcm2835_power_devs[] = {
	{ .name = "bcm2835-power" },
};

static int bcm2835_pm_get_pdata(struct platform_device *pdev,
				struct bcm2835_pm *pm)
{
	if (of_property_present(pm->dev->of_node, "reg-names")) {
		struct resource *res;

		pm->base = devm_platform_ioremap_resource_byname(pdev, "pm");
		if (IS_ERR(pm->base))
			return PTR_ERR(pm->base);

		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "asb");
		if (res) {
			pm->asb = devm_ioremap_resource(&pdev->dev, res);
			if (IS_ERR(pm->asb))
				pm->asb = NULL;
		}

		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						    "rpivid_asb");
		if (res) {
			pm->rpivid_asb = devm_ioremap_resource(&pdev->dev, res);
			if (IS_ERR(pm->rpivid_asb))
				pm->rpivid_asb = NULL;
		}

		return 0;
	}

	/* If no 'reg-names' property is found we can assume we're using old DTB. */
	pm->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(pm->base))
		return PTR_ERR(pm->base);

	pm->asb = devm_platform_ioremap_resource(pdev, 1);
	if (IS_ERR(pm->asb))
		pm->asb = NULL;

	pm->rpivid_asb = devm_platform_ioremap_resource(pdev, 2);
	if (IS_ERR(pm->rpivid_asb))
		pm->rpivid_asb = NULL;

	return 0;
}

static int bcm2835_pm_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct bcm2835_pm *pm;
	int ret;

	pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
	if (!pm)
		return -ENOMEM;
	platform_set_drvdata(pdev, pm);

	pm->dev = dev;

	ret = bcm2835_pm_get_pdata(pdev, pm);
	if (ret)
		return ret;

	ret = devm_mfd_add_devices(dev, -1,
				   bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
				   NULL, 0, NULL);
	if (ret)
		return ret;

	/*
	 * We'll use the presence of the AXI ASB regs in the
	 * bcm2835-pm binding as the key for whether we can reference
	 * the full PM register range and support power domains.
	 */
	if (pm->asb)
		return devm_mfd_add_devices(dev, -1, bcm2835_power_devs,
					    ARRAY_SIZE(bcm2835_power_devs),
					    NULL, 0, NULL);
	return 0;
}

static const struct of_device_id bcm2835_pm_of_match[] = {
	{ .compatible = "brcm,bcm2835-pm-wdt", },
	{ .compatible = "brcm,bcm2835-pm", },
	{ .compatible = "brcm,bcm2711-pm", },
	{},
};
MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);

static struct platform_driver bcm2835_pm_driver = {
	.probe		= bcm2835_pm_probe,
	.driver = {
		.name =	"bcm2835-pm",
		.of_match_table = bcm2835_pm_of_match,
	},
};
module_platform_driver(bcm2835_pm_driver);

MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
Commit	Line	Data
5e6acc3e EA	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* PM MFD driver for Broadcom BCM2835
	4	*
	5	* This driver binds to the PM block and creates the MFD device for
670c6726	6	* the WDT and power drivers.
5e6acc3e EA	7	*/
	8
	9	#include <linux/delay.h>
	10	#include <linux/io.h>
	11	#include <linux/mfd/bcm2835-pm.h>
	12	#include <linux/mfd/core.h>
	13	#include <linux/module.h>
	14	#include <linux/of_address.h>
	15	#include <linux/of_platform.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/types.h>
	18	#include <linux/watchdog.h>
	19
	20	static const struct mfd_cell bcm2835_pm_devs[] = {
	21	{ .name = "bcm2835-wdt" },
	22	};
	23
670c6726 EA	24	static const struct mfd_cell bcm2835_power_devs[] = {
	25	{ .name = "bcm2835-power" },
	26	};
	27
01e7865d NSJ	28	static int bcm2835_pm_get_pdata(struct platform_device *pdev,
	29	struct bcm2835_pm *pm)
	30	{
1ba58fbb	31	if (of_property_present(pm->dev->of_node, "reg-names")) {
01e7865d NSJ	32	struct resource *res;
	33
	34	pm->base = devm_platform_ioremap_resource_byname(pdev, "pm");
	35	if (IS_ERR(pm->base))
	36	return PTR_ERR(pm->base);
	37
	38	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "asb");
	39	if (res) {
	40	pm->asb = devm_ioremap_resource(&pdev->dev, res);
	41	if (IS_ERR(pm->asb))
	42	pm->asb = NULL;
	43	}
	44
df762342 SW	45	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	46	"rpivid_asb");
	47	if (res) {
	48	pm->rpivid_asb = devm_ioremap_resource(&pdev->dev, res);
	49	if (IS_ERR(pm->rpivid_asb))
	50	pm->rpivid_asb = NULL;
	51	}
	52
01e7865d NSJ	53	return 0;
	54	}
	55
	56	/* If no 'reg-names' property is found we can assume we're using old DTB. */
	57	pm->base = devm_platform_ioremap_resource(pdev, 0);
	58	if (IS_ERR(pm->base))
	59	return PTR_ERR(pm->base);
	60
	61	pm->asb = devm_platform_ioremap_resource(pdev, 1);
	62	if (IS_ERR(pm->asb))
	63	pm->asb = NULL;
	64
df762342 SW	65	pm->rpivid_asb = devm_platform_ioremap_resource(pdev, 2);
	66	if (IS_ERR(pm->rpivid_asb))
	67	pm->rpivid_asb = NULL;
	68
01e7865d NSJ	69	return 0;
	70	}
	71
5e6acc3e EA	72	static int bcm2835_pm_probe(struct platform_device *pdev)
5e6acc3e EA	73	{
5e6acc3e EA	74	struct device *dev = &pdev->dev;
5e6acc3e EA	75	struct bcm2835_pm *pm;
670c6726	76	int ret;
5e6acc3e EA	77
	78	pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
	79	if (!pm)
	80	return -ENOMEM;
	81	platform_set_drvdata(pdev, pm);
	82
	83	pm->dev = dev;
	84
01e7865d NSJ	85	ret = bcm2835_pm_get_pdata(pdev, pm);
	86	if (ret)
	87	return ret;
5e6acc3e	88
670c6726 EA	89	ret = devm_mfd_add_devices(dev, -1,
	90	bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
	91	NULL, 0, NULL);
	92	if (ret)
	93	return ret;
	94
01e7865d NSJ	95	/*
01e7865d NSJ	96	* We'll use the presence of the AXI ASB regs in the
670c6726 EA	97	* bcm2835-pm binding as the key for whether we can reference
	98	* the full PM register range and support power domains.
	99	*/
01e7865d NSJ	100	if (pm->asb)
	101	return devm_mfd_add_devices(dev, -1, bcm2835_power_devs,
	102	ARRAY_SIZE(bcm2835_power_devs),
	103	NULL, 0, NULL);
670c6726	104	return 0;
5e6acc3e EA	105	}
	106
	107	static const struct of_device_id bcm2835_pm_of_match[] = {
	108	{ .compatible = "brcm,bcm2835-pm-wdt", },
670c6726	109	{ .compatible = "brcm,bcm2835-pm", },
df762342	110	{ .compatible = "brcm,bcm2711-pm", },
5e6acc3e EA	111	{},
	112	};
	113	MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
	114
	115	static struct platform_driver bcm2835_pm_driver = {
	116	.probe = bcm2835_pm_probe,
	117	.driver = {
	118	.name = "bcm2835-pm",
	119	.of_match_table = bcm2835_pm_of_match,
	120	},
	121	};
	122	module_platform_driver(bcm2835_pm_driver);
	123
	124	MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
	125	MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");