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_RET(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