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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power.c (1461B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* power.c: Power management driver.
      3 *
      4 * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net)
      5 */
      6
      7#include <linux/kernel.h>
      8#include <linux/export.h>
      9#include <linux/init.h>
     10#include <linux/interrupt.h>
     11#include <linux/reboot.h>
     12#include <linux/of_device.h>
     13
     14#include <asm/prom.h>
     15#include <asm/io.h>
     16
     17static void __iomem *power_reg;
     18
     19static irqreturn_t power_handler(int irq, void *dev_id)
     20{
     21	orderly_poweroff(true);
     22
     23	/* FIXME: Check registers for status... */
     24	return IRQ_HANDLED;
     25}
     26
     27static int has_button_interrupt(unsigned int irq, struct device_node *dp)
     28{
     29	if (irq == 0xffffffff)
     30		return 0;
     31	if (!of_find_property(dp, "button", NULL))
     32		return 0;
     33
     34	return 1;
     35}
     36
     37static int power_probe(struct platform_device *op)
     38{
     39	struct resource *res = &op->resource[0];
     40	unsigned int irq = op->archdata.irqs[0];
     41
     42	power_reg = of_ioremap(res, 0, 0x4, "power");
     43
     44	printk(KERN_INFO "%pOFn: Control reg at %llx\n",
     45	       op->dev.of_node, res->start);
     46
     47	if (has_button_interrupt(irq, op->dev.of_node)) {
     48		if (request_irq(irq,
     49				power_handler, 0, "power", NULL) < 0)
     50			printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
     51	}
     52
     53	return 0;
     54}
     55
     56static const struct of_device_id power_match[] = {
     57	{
     58		.name = "power",
     59	},
     60	{},
     61};
     62
     63static struct platform_driver power_driver = {
     64	.probe		= power_probe,
     65	.driver = {
     66		.name = "power",
     67		.of_match_table = power_match,
     68	},
     69};
     70
     71builtin_platform_driver(power_driver);