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
22 static char *omap2_pmu_oh_names[] = {"mpu"};
23 static char *omap3_pmu_oh_names[] = {"mpu", "debugss"};
24 static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"};
25 static 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 */
omap2_init_pmu(unsigned oh_num,char * oh_names[])36 static 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
omap_init_pmu(void)61 static 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 }
97 omap_subsys_initcall(omap_init_pmu);
98