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