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Jon Hunteree75d952012-09-23 17:28:29 -06001/*
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 */
Jon Hunter6a9bce22012-09-23 17:28:30 -060014#include <linux/pm_runtime.h>
Jon Hunteree75d952012-09-23 17:28:29 -060015
16#include <asm/pmu.h>
17
Tony Lindgren2a296c82012-10-02 17:41:35 -070018#include "omap_hwmod.h"
Tony Lindgren25c7d492012-10-02 17:25:48 -070019#include "omap_device.h"
Jon Hunteree75d952012-09-23 17:28:29 -060020
21static char *omap2_pmu_oh_names[] = {"mpu"};
22static char *omap3_pmu_oh_names[] = {"mpu", "debugss"};
Ming Leiefc7f492012-09-23 17:28:29 -060023static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"};
Jon Hunteree75d952012-09-23 17:28:29 -060024static struct platform_device *omap_pmu_dev;
25
26/**
27 * omap2_init_pmu - creates and registers PMU platform device
28 * @oh_num: Number of OMAP HWMODs required to create PMU device
29 * @oh_names: Array of OMAP HWMODS names required to create PMU device
30 *
31 * Uses OMAP HWMOD framework to create and register an ARM PMU device
Ming Leiefc7f492012-09-23 17:28:29 -060032 * from a list of HWMOD names passed. Currently supports OMAP2, OMAP3
Jon Hunter76a5d9b2012-09-23 17:28:30 -060033 * and OMAP4 devices.
Jon Hunteree75d952012-09-23 17:28:29 -060034 */
35static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[])
36{
37 int i;
Ming Leiefc7f492012-09-23 17:28:29 -060038 struct omap_hwmod *oh[3];
Jon Hunteree75d952012-09-23 17:28:29 -060039 char *dev_name = "arm-pmu";
40
Ming Leiefc7f492012-09-23 17:28:29 -060041 if ((!oh_num) || (oh_num > 3))
Jon Hunteree75d952012-09-23 17:28:29 -060042 return -EINVAL;
43
44 for (i = 0; i < oh_num; i++) {
45 oh[i] = omap_hwmod_lookup(oh_names[i]);
46 if (!oh[i]) {
47 pr_err("Could not look up %s hwmod\n", oh_names[i]);
48 return -ENODEV;
49 }
50 }
51
52 omap_pmu_dev = omap_device_build_ss(dev_name, -1, oh, oh_num, NULL, 0,
53 NULL, 0, 0);
54 WARN(IS_ERR(omap_pmu_dev), "Can't build omap_device for %s.\n",
55 dev_name);
56
Jon Hunter6a9bce22012-09-23 17:28:30 -060057 if (IS_ERR(omap_pmu_dev))
58 return PTR_ERR(omap_pmu_dev);
59
60 pm_runtime_enable(&omap_pmu_dev->dev);
61
62 return 0;
Jon Hunteree75d952012-09-23 17:28:29 -060063}
64
65static int __init omap_init_pmu(void)
66{
67 unsigned oh_num;
68 char **oh_names;
69
70 /*
71 * To create an ARM-PMU device the following HWMODs
72 * are required for the various OMAP2+ devices.
73 *
74 * OMAP24xx: mpu
75 * OMAP3xxx: mpu, debugss
Ming Leiefc7f492012-09-23 17:28:29 -060076 * OMAP4430: l3_main_3, l3_instr, debugss
Jon Hunter76a5d9b2012-09-23 17:28:30 -060077 * OMAP4460/70: mpu, debugss
Jon Hunteree75d952012-09-23 17:28:29 -060078 */
Jon Hunter76a5d9b2012-09-23 17:28:30 -060079 if (cpu_is_omap443x()) {
Ming Leiefc7f492012-09-23 17:28:29 -060080 oh_num = ARRAY_SIZE(omap4430_pmu_oh_names);
81 oh_names = omap4430_pmu_oh_names;
82 /* XXX Remove the next two lines when CTI driver available */
83 pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n");
84 return 0;
Jon Hunter76a5d9b2012-09-23 17:28:30 -060085 } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
86 oh_num = ARRAY_SIZE(omap3_pmu_oh_names);
87 oh_names = omap3_pmu_oh_names;
Jon Hunteree75d952012-09-23 17:28:29 -060088 } else {
Jon Hunter76a5d9b2012-09-23 17:28:30 -060089 oh_num = ARRAY_SIZE(omap2_pmu_oh_names);
90 oh_names = omap2_pmu_oh_names;
Jon Hunteree75d952012-09-23 17:28:29 -060091 }
92
93 return omap2_init_pmu(oh_num, oh_names);
94}
95subsys_initcall(omap_init_pmu);