cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bcm2835-pm.c (2264B)

      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_probe(struct platform_device *pdev)
     29{
     30	struct resource *res;
     31	struct device *dev = &pdev->dev;
     32	struct bcm2835_pm *pm;
     33	int ret;
     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
     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;
     72}
     73
     74static const struct of_device_id bcm2835_pm_of_match[] = {
     75	{ .compatible = "brcm,bcm2835-pm-wdt", },
     76	{ .compatible = "brcm,bcm2835-pm", },
     77	{},
     78};
     79MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
     80
     81static 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};
     88module_platform_driver(bcm2835_pm_driver);
     89
     90MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
     91MODULE_DESCRIPTION("Driver for Broadcom BCM2835 PM MFD");
     92MODULE_LICENSE("GPL");