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
6 * the WDT and power drivers.
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
20static const struct mfd_cell bcm2835_pm_devs[] = {
21	{ .name = "bcm2835-wdt" },
22};
23
24static const struct mfd_cell bcm2835_power_devs[] = {
25	{ .name = "bcm2835-power" },
26};
27
28static int bcm2835_pm_get_pdata(struct platform_device *pdev,
29				struct bcm2835_pm *pm)
30{
31	if (of_property_present(pm->dev->of_node, "reg-names")) {
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
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
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
65	pm->rpivid_asb = devm_platform_ioremap_resource(pdev, 2);
66	if (IS_ERR(pm->rpivid_asb))
67		pm->rpivid_asb = NULL;
68
69	return 0;
70}
71
72static int bcm2835_pm_probe(struct platform_device *pdev)
73{
74	struct device *dev = &pdev->dev;
75	struct bcm2835_pm *pm;
76	int ret;
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
85	ret = bcm2835_pm_get_pdata(pdev, pm);
86	if (ret)
87		return ret;
88
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
95	/*
96	 * We'll use the presence of the AXI ASB regs in the
97	 * bcm2835-pm binding as the key for whether we can reference
98	 * the full PM register range and support power domains.
99	 */
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);
104	return 0;
105}
106
107static const struct of_device_id bcm2835_pm_of_match[] = {
108	{ .compatible = "brcm,bcm2835-pm-wdt", },
109	{ .compatible = "brcm,bcm2835-pm", },
110	{ .compatible = "brcm,bcm2711-pm", },
111	{},
112};
113MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
114
115static 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};
122module_platform_driver(bcm2835_pm_driver);
123
124MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
125MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
126