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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pm-imx27.c (1050B)

      1/*
      2 * i.MX27 Power Management Routines
      3 *
      4 * Based on Freescale's BSP
      5 *
      6 * This program is free software; you can redistribute it and/or
      7 * modify it under the terms of the GNU General Public License.
      8 */
      9
     10#include <linux/of_address.h>
     11#include <linux/kernel.h>
     12#include <linux/suspend.h>
     13#include <linux/io.h>
     14
     15#include "common.h"
     16#include "hardware.h"
     17
     18static int mx27_suspend_enter(suspend_state_t state)
     19{
     20	void __iomem *ccm_base;
     21	struct device_node *np;
     22	u32 cscr;
     23
     24	np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
     25	ccm_base = of_iomap(np, 0);
     26	BUG_ON(!ccm_base);
     27
     28	switch (state) {
     29	case PM_SUSPEND_MEM:
     30		/* Clear MPEN and SPEN to disable MPLL/SPLL */
     31		cscr = imx_readl(ccm_base);
     32		cscr &= 0xFFFFFFFC;
     33		imx_writel(cscr, ccm_base);
     34		/* Executes WFI */
     35		cpu_do_idle();
     36		break;
     37
     38	default:
     39		return -EINVAL;
     40	}
     41	return 0;
     42}
     43
     44static const struct platform_suspend_ops mx27_suspend_ops = {
     45	.enter = mx27_suspend_enter,
     46	.valid = suspend_valid_only_mem,
     47};
     48
     49void __init imx27_pm_init(void)
     50{
     51	suspend_set_ops(&mx27_suspend_ops);
     52}