LXR linux/arch/powerpc/platforms/85xx/mpc85xx_pm

   1/*
   2 * MPC85xx PM operators
   3 *
   4 * Copyright 2015 Freescale Semiconductor Inc.
   5 *
   6 * This program is free software; you can redistribute  it and/or modify it
   7 * under  the terms of  the GNU General  Public License as published by the
   8 * Free Software Foundation;  either version 2 of the  License, or (at your
   9 * option) any later version.
  10 */
  11
  12#define pr_fmt(fmt) "%s: " fmt, __func__
  13
  14#include <linux/kernel.h>
  15#include <linux/of.h>
  16#include <linux/of_address.h>
  17#include <linux/fsl/guts.h>
  18
  19#include <asm/io.h>
  20#include <asm/fsl_pm.h>
  21
  22static struct ccsr_guts __iomem *guts;
  23
  24static void mpc85xx_irq_mask(int cpu)
  25{
  26
  27}
  28
  29static void mpc85xx_irq_unmask(int cpu)
  30{
  31
  32}
  33
  34static void mpc85xx_cpu_die(int cpu)
  35{
  36        u32 tmp;
  37
  38        tmp = (mfspr(SPRN_HID0) & ~(HID0_DOZE|HID0_SLEEP)) | HID0_NAP;
  39        mtspr(SPRN_HID0, tmp);
  40
  41        /* Enter NAP mode. */
  42        tmp = mfmsr();
  43        tmp |= MSR_WE;
  44        asm volatile(
  45                "msync\n"
  46                "mtmsr %0\n"
  47                "isync\n"
  48                :
  49                : "r" (tmp));
  50}
  51
  52static void mpc85xx_cpu_up_prepare(int cpu)
  53{
  54
  55}
  56
  57static void mpc85xx_freeze_time_base(bool freeze)
  58{
  59        uint32_t mask;
  60
  61        mask = CCSR_GUTS_DEVDISR_TB0 | CCSR_GUTS_DEVDISR_TB1;
  62        if (freeze)
  63                setbits32(&guts->devdisr, mask);
  64        else
  65                clrbits32(&guts->devdisr, mask);
  66
  67        in_be32(&guts->devdisr);
  68}
  69
  70static const struct of_device_id mpc85xx_smp_guts_ids[] = {
  71        { .compatible = "fsl,mpc8572-guts", },
  72        { .compatible = "fsl,p1020-guts", },
  73        { .compatible = "fsl,p1021-guts", },
  74        { .compatible = "fsl,p1022-guts", },
  75        { .compatible = "fsl,p1023-guts", },
  76        { .compatible = "fsl,p2020-guts", },
  77        { .compatible = "fsl,bsc9132-guts", },
  78        {},
  79};
  80
  81static const struct fsl_pm_ops mpc85xx_pm_ops = {
  82        .freeze_time_base = mpc85xx_freeze_time_base,
  83        .irq_mask = mpc85xx_irq_mask,
  84        .irq_unmask = mpc85xx_irq_unmask,
  85        .cpu_die = mpc85xx_cpu_die,
  86        .cpu_up_prepare = mpc85xx_cpu_up_prepare,
  87};
  88
  89int __init mpc85xx_setup_pmc(void)
  90{
  91        struct device_node *np;
  92
  93        np = of_find_matching_node(NULL, mpc85xx_smp_guts_ids);
  94        if (np) {
  95                guts = of_iomap(np, 0);
  96                of_node_put(np);
  97                if (!guts) {
  98                        pr_err("Could not map guts node address\n");
  99                        return -ENOMEM;
 100                }
 101        }
 102
 103        qoriq_pm_ops = &mpc85xx_pm_ops;
 104
 105        return 0;
 106}
 107