1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * PM MFD driver for Broadcom BCM2835
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * This driver binds to the PM block and creates the MFD device for
6*4882a593Smuzhiyun * the WDT and power drivers.
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/delay.h>
10*4882a593Smuzhiyun #include <linux/io.h>
11*4882a593Smuzhiyun #include <linux/mfd/bcm2835-pm.h>
12*4882a593Smuzhiyun #include <linux/mfd/core.h>
13*4882a593Smuzhiyun #include <linux/module.h>
14*4882a593Smuzhiyun #include <linux/of_address.h>
15*4882a593Smuzhiyun #include <linux/of_platform.h>
16*4882a593Smuzhiyun #include <linux/platform_device.h>
17*4882a593Smuzhiyun #include <linux/types.h>
18*4882a593Smuzhiyun #include <linux/watchdog.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun static const struct mfd_cell bcm2835_pm_devs[] = {
21*4882a593Smuzhiyun { .name = "bcm2835-wdt" },
22*4882a593Smuzhiyun };
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun static const struct mfd_cell bcm2835_power_devs[] = {
25*4882a593Smuzhiyun { .name = "bcm2835-power" },
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
bcm2835_pm_probe(struct platform_device * pdev)28*4882a593Smuzhiyun static int bcm2835_pm_probe(struct platform_device *pdev)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun struct resource *res;
31*4882a593Smuzhiyun struct device *dev = &pdev->dev;
32*4882a593Smuzhiyun struct bcm2835_pm *pm;
33*4882a593Smuzhiyun int ret;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
36*4882a593Smuzhiyun if (!pm)
37*4882a593Smuzhiyun return -ENOMEM;
38*4882a593Smuzhiyun platform_set_drvdata(pdev, pm);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun pm->dev = dev;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
43*4882a593Smuzhiyun pm->base = devm_ioremap_resource(dev, res);
44*4882a593Smuzhiyun if (IS_ERR(pm->base))
45*4882a593Smuzhiyun return PTR_ERR(pm->base);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun ret = devm_mfd_add_devices(dev, -1,
48*4882a593Smuzhiyun bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
49*4882a593Smuzhiyun NULL, 0, NULL);
50*4882a593Smuzhiyun if (ret)
51*4882a593Smuzhiyun return ret;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun /* We'll use the presence of the AXI ASB regs in the
54*4882a593Smuzhiyun * bcm2835-pm binding as the key for whether we can reference
55*4882a593Smuzhiyun * the full PM register range and support power domains.
56*4882a593Smuzhiyun */
57*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
58*4882a593Smuzhiyun if (res) {
59*4882a593Smuzhiyun pm->asb = devm_ioremap_resource(dev, res);
60*4882a593Smuzhiyun if (IS_ERR(pm->asb))
61*4882a593Smuzhiyun return PTR_ERR(pm->asb);
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun ret = devm_mfd_add_devices(dev, -1,
64*4882a593Smuzhiyun bcm2835_power_devs,
65*4882a593Smuzhiyun ARRAY_SIZE(bcm2835_power_devs),
66*4882a593Smuzhiyun NULL, 0, NULL);
67*4882a593Smuzhiyun if (ret)
68*4882a593Smuzhiyun return ret;
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun return 0;
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun static const struct of_device_id bcm2835_pm_of_match[] = {
75*4882a593Smuzhiyun { .compatible = "brcm,bcm2835-pm-wdt", },
76*4882a593Smuzhiyun { .compatible = "brcm,bcm2835-pm", },
77*4882a593Smuzhiyun {},
78*4882a593Smuzhiyun };
79*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static struct platform_driver bcm2835_pm_driver = {
82*4882a593Smuzhiyun .probe = bcm2835_pm_probe,
83*4882a593Smuzhiyun .driver = {
84*4882a593Smuzhiyun .name = "bcm2835-pm",
85*4882a593Smuzhiyun .of_match_table = bcm2835_pm_of_match,
86*4882a593Smuzhiyun },
87*4882a593Smuzhiyun };
88*4882a593Smuzhiyun module_platform_driver(bcm2835_pm_driver);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
91*4882a593Smuzhiyun MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
92*4882a593Smuzhiyun MODULE_LICENSE("GPL");
93