/*
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* OMAP2 ARM Performance Monitoring Unit (PMU) Support
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*
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* Copyright (C) 2012 Texas Instruments, Inc.
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*
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* Contacts:
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* Jon Hunter <jon-hunter@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/of.h>
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#include <asm/system_info.h>
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#include "soc.h"
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#include "omap_hwmod.h"
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#include "omap_device.h"
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static char *omap2_pmu_oh_names[] = {"mpu"};
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static char *omap3_pmu_oh_names[] = {"mpu", "debugss"};
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static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"};
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static struct platform_device *omap_pmu_dev;
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/**
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* omap2_init_pmu - creates and registers PMU platform device
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* @oh_num: Number of OMAP HWMODs required to create PMU device
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* @oh_names: Array of OMAP HWMODS names required to create PMU device
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*
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* Uses OMAP HWMOD framework to create and register an ARM PMU device
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* from a list of HWMOD names passed. Currently supports OMAP2, OMAP3
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* and OMAP4 devices.
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*/
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static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[])
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{
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int i;
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struct omap_hwmod *oh[3];
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char *dev_name = cpu_architecture() == CPU_ARCH_ARMv6 ?
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"armv6-pmu" : "armv7-pmu";
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if ((!oh_num) || (oh_num > 3))
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return -EINVAL;
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for (i = 0; i < oh_num; i++) {
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oh[i] = omap_hwmod_lookup(oh_names[i]);
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if (!oh[i]) {
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pr_err("Could not look up %s hwmod\n", oh_names[i]);
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return -ENODEV;
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}
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}
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omap_pmu_dev = omap_device_build_ss(dev_name, -1, oh, oh_num, NULL, 0);
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WARN(IS_ERR(omap_pmu_dev), "Can't build omap_device for %s.\n",
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dev_name);
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return PTR_ERR_OR_ZERO(omap_pmu_dev);
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}
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static int __init omap_init_pmu(void)
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{
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unsigned oh_num;
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char **oh_names;
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/* XXX Remove this check when the CTI driver is available */
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if (cpu_is_omap443x()) {
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pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n");
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return 0;
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}
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if (of_have_populated_dt())
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return 0;
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/*
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* To create an ARM-PMU device the following HWMODs
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* are required for the various OMAP2+ devices.
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*
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* OMAP24xx: mpu
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* OMAP3xxx: mpu, debugss
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* OMAP4430: l3_main_3, l3_instr, debugss
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* OMAP4460/70: mpu, debugss
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*/
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if (cpu_is_omap443x()) {
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oh_num = ARRAY_SIZE(omap4430_pmu_oh_names);
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oh_names = omap4430_pmu_oh_names;
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} else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
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oh_num = ARRAY_SIZE(omap3_pmu_oh_names);
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oh_names = omap3_pmu_oh_names;
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} else {
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oh_num = ARRAY_SIZE(omap2_pmu_oh_names);
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oh_names = omap2_pmu_oh_names;
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}
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return omap2_init_pmu(oh_num, oh_names);
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}
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omap_subsys_initcall(omap_init_pmu);
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