^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * PM MFD driver for Broadcom BCM2835
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * This driver binds to the PM block and creates the MFD device for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * the WDT and power drivers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mfd/bcm2835-pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/mfd/core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static const struct mfd_cell bcm2835_pm_devs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) { .name = "bcm2835-wdt" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static const struct mfd_cell bcm2835_power_devs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) { .name = "bcm2835-power" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static int bcm2835_pm_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct resource *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct bcm2835_pm *pm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (!pm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) platform_set_drvdata(pdev, pm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) pm->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) pm->base = devm_ioremap_resource(dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (IS_ERR(pm->base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return PTR_ERR(pm->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) ret = devm_mfd_add_devices(dev, -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) NULL, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* We'll use the presence of the AXI ASB regs in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * bcm2835-pm binding as the key for whether we can reference
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * the full PM register range and support power domains.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) pm->asb = devm_ioremap_resource(dev, res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (IS_ERR(pm->asb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return PTR_ERR(pm->asb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ret = devm_mfd_add_devices(dev, -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) bcm2835_power_devs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) ARRAY_SIZE(bcm2835_power_devs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) NULL, 0, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static const struct of_device_id bcm2835_pm_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) { .compatible = "brcm,bcm2835-pm-wdt", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) { .compatible = "brcm,bcm2835-pm", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static struct platform_driver bcm2835_pm_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) .probe = bcm2835_pm_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) .name = "bcm2835-pm",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .of_match_table = bcm2835_pm_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) module_platform_driver(bcm2835_pm_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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