[mirror_ubuntu-focal-kernel.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_probe(struct platform_device *pdev)
{
	struct resource *res;
	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;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	pm->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(pm->base))
		return PTR_ERR(pm->base);

	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.
	 */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (res) {
		pm->asb = devm_ioremap_resource(dev, res);
		if (IS_ERR(pm->asb))
			return PTR_ERR(pm->asb);

		ret = devm_mfd_add_devices(dev, -1,
					   bcm2835_power_devs,
					   ARRAY_SIZE(bcm2835_power_devs),
					   NULL, 0, NULL);
		if (ret)
			return ret;
	}

	return 0;
}

static const struct of_device_id bcm2835_pm_of_match[] = {
	{ .compatible = "brcm,bcm2835-pm-wdt", },
	{ .compatible = "brcm,bcm2835-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");
MODULE_LICENSE("GPL");
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
5e6acc3e EA	28	static int bcm2835_pm_probe(struct platform_device *pdev)
	29	{
	30	struct resource *res;
	31	struct device *dev = &pdev->dev;
	32	struct bcm2835_pm *pm;
670c6726	33	int ret;
5e6acc3e EA	34
	35	pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
	36	if (!pm)
	37	return -ENOMEM;
	38	platform_set_drvdata(pdev, pm);
	39
	40	pm->dev = dev;
	41
	42	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	43	pm->base = devm_ioremap_resource(dev, res);
	44	if (IS_ERR(pm->base))
	45	return PTR_ERR(pm->base);
	46
670c6726 EA	47	ret = devm_mfd_add_devices(dev, -1,
	48	bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
	49	NULL, 0, NULL);
	50	if (ret)
	51	return ret;
	52
	53	/* We'll use the presence of the AXI ASB regs in the
	54	* bcm2835-pm binding as the key for whether we can reference
	55	* the full PM register range and support power domains.
	56	*/
	57	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	58	if (res) {
	59	pm->asb = devm_ioremap_resource(dev, res);
	60	if (IS_ERR(pm->asb))
	61	return PTR_ERR(pm->asb);
	62
	63	ret = devm_mfd_add_devices(dev, -1,
	64	bcm2835_power_devs,
	65	ARRAY_SIZE(bcm2835_power_devs),
	66	NULL, 0, NULL);
	67	if (ret)
	68	return ret;
	69	}
	70
	71	return 0;
5e6acc3e EA	72	}
	73
	74	static const struct of_device_id bcm2835_pm_of_match[] = {
	75	{ .compatible = "brcm,bcm2835-pm-wdt", },
670c6726	76	{ .compatible = "brcm,bcm2835-pm", },
5e6acc3e EA	77	{},
	78	};
	79	MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
	80
	81	static struct platform_driver bcm2835_pm_driver = {
	82	.probe = bcm2835_pm_probe,
	83	.driver = {
	84	.name = "bcm2835-pm",
	85	.of_match_table = bcm2835_pm_of_match,
	86	},
	87	};
	88	module_platform_driver(bcm2835_pm_driver);
	89
	90	MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
	91	MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
	92	MODULE_LICENSE("GPL");