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This provides a free software alternative to raspberrypi-power.c's firmware calls to manage power domains. It also exposes a reset line, where previously the vc4 driver had to try to force power off the domain in order to trigger a reset. Signed-off-by: Eric Anholt <eric@anholt.net> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* PM MFD driver for Broadcom BCM2835
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*
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* This driver binds to the PM block and creates the MFD device for
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* the WDT and power drivers.
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/mfd/bcm2835-pm.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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static const struct mfd_cell bcm2835_pm_devs[] = {
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{ .name = "bcm2835-wdt" },
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};
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static const struct mfd_cell bcm2835_power_devs[] = {
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{ .name = "bcm2835-power" },
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};
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static int bcm2835_pm_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct device *dev = &pdev->dev;
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struct bcm2835_pm *pm;
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int ret;
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pm = devm_kzalloc(dev, sizeof(*pm), GFP_KERNEL);
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if (!pm)
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return -ENOMEM;
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platform_set_drvdata(pdev, pm);
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pm->dev = dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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pm->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(pm->base))
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return PTR_ERR(pm->base);
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ret = devm_mfd_add_devices(dev, -1,
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bcm2835_pm_devs, ARRAY_SIZE(bcm2835_pm_devs),
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NULL, 0, NULL);
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if (ret)
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return ret;
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/* We'll use the presence of the AXI ASB regs in the
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* bcm2835-pm binding as the key for whether we can reference
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* the full PM register range and support power domains.
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*/
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (res) {
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pm->asb = devm_ioremap_resource(dev, res);
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if (IS_ERR(pm->asb))
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return PTR_ERR(pm->asb);
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ret = devm_mfd_add_devices(dev, -1,
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bcm2835_power_devs,
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ARRAY_SIZE(bcm2835_power_devs),
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NULL, 0, NULL);
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if (ret)
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return ret;
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}
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return 0;
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}
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static const struct of_device_id bcm2835_pm_of_match[] = {
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{ .compatible = "brcm,bcm2835-pm-wdt", },
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{ .compatible = "brcm,bcm2835-pm", },
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{},
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};
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MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
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static struct platform_driver bcm2835_pm_driver = {
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.probe = bcm2835_pm_probe,
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.driver = {
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.name = "bcm2835-pm",
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.of_match_table = bcm2835_pm_of_match,
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},
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};
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module_platform_driver(bcm2835_pm_driver);
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MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
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MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
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MODULE_LICENSE("GPL");
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