LXR linux/arch/arm/mach-omap2/pmu.c

   1/*
   2 * OMAP2 ARM Performance Monitoring Unit (PMU) Support
   3 *
   4 * Copyright (C) 2012 Texas Instruments, Inc.
   5 *
   6 * Contacts:
   7 * Jon Hunter <jon-hunter@ti.com>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 */
  14#include <linux/of.h>
  15
  16#include <asm/system_info.h>
  17
  18#include "soc.h"
  19#include "omap_hwmod.h"
  20#include "omap_device.h"
  21
  22static char *omap2_pmu_oh_names[] = {"mpu"};
  23static char *omap3_pmu_oh_names[] = {"mpu", "debugss"};
  24static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"};
  25static struct platform_device *omap_pmu_dev;
  26
  27/**
  28 * omap2_init_pmu - creates and registers PMU platform device
  29 * @oh_num:     Number of OMAP HWMODs required to create PMU device
  30 * @oh_names:   Array of OMAP HWMODS names required to create PMU device
  31 *
  32 * Uses OMAP HWMOD framework to create and register an ARM PMU device
  33 * from a list of HWMOD names passed. Currently supports OMAP2, OMAP3
  34 * and OMAP4 devices.
  35 */
  36static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[])
  37{
  38        int i;
  39        struct omap_hwmod *oh[3];
  40        char *dev_name = cpu_architecture() == CPU_ARCH_ARMv6 ?
  41                         "armv6-pmu" : "armv7-pmu";
  42
  43        if ((!oh_num) || (oh_num > 3))
  44                return -EINVAL;
  45
  46        for (i = 0; i < oh_num; i++) {
  47                oh[i] = omap_hwmod_lookup(oh_names[i]);
  48                if (!oh[i]) {
  49                        pr_err("Could not look up %s hwmod\n", oh_names[i]);
  50                        return -ENODEV;
  51                }
  52        }
  53
  54        omap_pmu_dev = omap_device_build_ss(dev_name, -1, oh, oh_num, NULL, 0);
  55        WARN(IS_ERR(omap_pmu_dev), "Can't build omap_device for %s.\n",
  56             dev_name);
  57
  58        return PTR_ERR_OR_ZERO(omap_pmu_dev);
  59}
  60
  61static int __init omap_init_pmu(void)
  62{
  63        unsigned oh_num;
  64        char **oh_names;
  65
  66        /* XXX Remove this check when the CTI driver is available */
  67        if (cpu_is_omap443x()) {
  68                pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n");
  69                return 0;
  70        }
  71
  72        if (of_have_populated_dt())
  73                return 0;
  74
  75        /*
  76         * To create an ARM-PMU device the following HWMODs
  77         * are required for the various OMAP2+ devices.
  78         *
  79         * OMAP24xx:    mpu
  80         * OMAP3xxx:    mpu, debugss
  81         * OMAP4430:    l3_main_3, l3_instr, debugss
  82         * OMAP4460/70: mpu, debugss
  83         */
  84        if (cpu_is_omap443x()) {
  85                oh_num = ARRAY_SIZE(omap4430_pmu_oh_names);
  86                oh_names = omap4430_pmu_oh_names;
  87        } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
  88                oh_num = ARRAY_SIZE(omap3_pmu_oh_names);
  89                oh_names = omap3_pmu_oh_names;
  90        } else {
  91                oh_num = ARRAY_SIZE(omap2_pmu_oh_names);
  92                oh_names = omap2_pmu_oh_names;
  93        }
  94
  95        return omap2_init_pmu(oh_num, oh_names);
  96}
  97omap_subsys_initcall(omap_init_pmu);
  98