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/pmu.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 = "arm-pmu";
41
42	if ((!oh_num) || (oh_num > 3))
43		return -EINVAL;
44
45	for (i = 0; i < oh_num; i++) {
46		oh[i] = omap_hwmod_lookup(oh_names[i]);
47		if (!oh[i]) {
48			pr_err("Could not look up %s hwmod\n", oh_names[i]);
49			return -ENODEV;
50		}
51	}
52
53	omap_pmu_dev = omap_device_build_ss(dev_name, -1, oh, oh_num, NULL, 0);
54	WARN(IS_ERR(omap_pmu_dev), "Can't build omap_device for %s.\n",
55	     dev_name);
56
57	return PTR_RET(omap_pmu_dev);
58}
59
60static int __init omap_init_pmu(void)
61{
62	unsigned oh_num;
63	char **oh_names;
64
65	/* XXX Remove this check when the CTI driver is available */
66	if (cpu_is_omap443x()) {
67		pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n");
68		return 0;
69	}
70
71	if (of_have_populated_dt())
72		return 0;
73
74	/*
75	 * To create an ARM-PMU device the following HWMODs
76	 * are required for the various OMAP2+ devices.
77	 *
78	 * OMAP24xx:	mpu
79	 * OMAP3xxx:	mpu, debugss
80	 * OMAP4430:	l3_main_3, l3_instr, debugss
81	 * OMAP4460/70:	mpu, debugss
82	 */
83	if (cpu_is_omap443x()) {
84		oh_num = ARRAY_SIZE(omap4430_pmu_oh_names);
85		oh_names = omap4430_pmu_oh_names;
86	} else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
87		oh_num = ARRAY_SIZE(omap3_pmu_oh_names);
88		oh_names = omap3_pmu_oh_names;
89	} else {
90		oh_num = ARRAY_SIZE(omap2_pmu_oh_names);
91		oh_names = omap2_pmu_oh_names;
92	}
93
94	return omap2_init_pmu(oh_num, oh_names);
95}
96omap_subsys_initcall(omap_init_pmu);