9debf822687c7a0a11724ed4ea218237d2cd1ce6
[linux-3.10.git] / arch / arm / mach-omap2 / pmu.c
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 <asm/pmu.h>
15
16 #include "soc.h"
17 #include "omap_hwmod.h"
18 #include "omap_device.h"
19
20 static char *omap2_pmu_oh_names[] = {"mpu"};
21 static char *omap3_pmu_oh_names[] = {"mpu", "debugss"};
22 static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"};
23 static struct platform_device *omap_pmu_dev;
24
25 /**
26  * omap2_init_pmu - creates and registers PMU platform device
27  * @oh_num:     Number of OMAP HWMODs required to create PMU device
28  * @oh_names:   Array of OMAP HWMODS names required to create PMU device
29  *
30  * Uses OMAP HWMOD framework to create and register an ARM PMU device
31  * from a list of HWMOD names passed. Currently supports OMAP2, OMAP3
32  * and OMAP4 devices.
33  */
34 static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[])
35 {
36         int i;
37         struct omap_hwmod *oh[3];
38         char *dev_name = "arm-pmu";
39
40         if ((!oh_num) || (oh_num > 3))
41                 return -EINVAL;
42
43         for (i = 0; i < oh_num; i++) {
44                 oh[i] = omap_hwmod_lookup(oh_names[i]);
45                 if (!oh[i]) {
46                         pr_err("Could not look up %s hwmod\n", oh_names[i]);
47                         return -ENODEV;
48                 }
49         }
50
51         omap_pmu_dev = omap_device_build_ss(dev_name, -1, oh, oh_num, NULL, 0);
52         WARN(IS_ERR(omap_pmu_dev), "Can't build omap_device for %s.\n",
53              dev_name);
54
55         if (IS_ERR(omap_pmu_dev))
56                 return PTR_ERR(omap_pmu_dev);
57
58         return 0;
59 }
60
61 static int __init omap_init_pmu(void)
62 {
63         unsigned oh_num;
64         char **oh_names;
65
66         /*
67          * To create an ARM-PMU device the following HWMODs
68          * are required for the various OMAP2+ devices.
69          *
70          * OMAP24xx:    mpu
71          * OMAP3xxx:    mpu, debugss
72          * OMAP4430:    l3_main_3, l3_instr, debugss
73          * OMAP4460/70: mpu, debugss
74          */
75         if (cpu_is_omap443x()) {
76                 oh_num = ARRAY_SIZE(omap4430_pmu_oh_names);
77                 oh_names = omap4430_pmu_oh_names;
78                 /* XXX Remove the next two lines when CTI driver available */
79                 pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n");
80                 return 0;
81         } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
82                 oh_num = ARRAY_SIZE(omap3_pmu_oh_names);
83                 oh_names = omap3_pmu_oh_names;
84         } else {
85                 oh_num = ARRAY_SIZE(omap2_pmu_oh_names);
86                 oh_names = omap2_pmu_oh_names;
87         }
88
89         return omap2_init_pmu(oh_num, oh_names);
90 }
91 omap_subsys_initcall(omap_init_pmu);