Commit | Line | Data |
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ee75d95c JH |
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 | */ | |
eeb7ba21 JH |
14 | #include <linux/of.h> |
15 | ||
ee75d95c JH |
16 | #include <asm/pmu.h> |
17 | ||
e4c060db | 18 | #include "soc.h" |
2a296c8f | 19 | #include "omap_hwmod.h" |
25c7d49e | 20 | #include "omap_device.h" |
ee75d95c JH |
21 | |
22 | static char *omap2_pmu_oh_names[] = {"mpu"}; | |
23 | static char *omap3_pmu_oh_names[] = {"mpu", "debugss"}; | |
efc7f49c | 24 | static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"}; |
ee75d95c JH |
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 | |
efc7f49c | 33 | * from a list of HWMOD names passed. Currently supports OMAP2, OMAP3 |
76a5d9bf | 34 | * and OMAP4 devices. |
ee75d95c JH |
35 | */ |
36 | static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[]) | |
37 | { | |
38 | int i; | |
efc7f49c | 39 | struct omap_hwmod *oh[3]; |
ee75d95c JH |
40 | char *dev_name = "arm-pmu"; |
41 | ||
efc7f49c | 42 | if ((!oh_num) || (oh_num > 3)) |
ee75d95c JH |
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 | ||
c1d1cd59 | 53 | omap_pmu_dev = omap_device_build_ss(dev_name, -1, oh, oh_num, NULL, 0); |
ee75d95c JH |
54 | WARN(IS_ERR(omap_pmu_dev), "Can't build omap_device for %s.\n", |
55 | dev_name); | |
56 | ||
1261674a | 57 | return PTR_RET(omap_pmu_dev); |
ee75d95c JH |
58 | } |
59 | ||
60 | static int __init omap_init_pmu(void) | |
61 | { | |
62 | unsigned oh_num; | |
63 | char **oh_names; | |
64 | ||
eeb7ba21 JH |
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 | ||
ee75d95c JH |
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 | |
efc7f49c | 80 | * OMAP4430: l3_main_3, l3_instr, debugss |
76a5d9bf | 81 | * OMAP4460/70: mpu, debugss |
ee75d95c | 82 | */ |
76a5d9bf | 83 | if (cpu_is_omap443x()) { |
efc7f49c ML |
84 | oh_num = ARRAY_SIZE(omap4430_pmu_oh_names); |
85 | oh_names = omap4430_pmu_oh_names; | |
76a5d9bf JH |
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; | |
ee75d95c | 89 | } else { |
76a5d9bf JH |
90 | oh_num = ARRAY_SIZE(omap2_pmu_oh_names); |
91 | oh_names = omap2_pmu_oh_names; | |
ee75d95c JH |
92 | } |
93 | ||
94 | return omap2_init_pmu(oh_num, oh_names); | |
95 | } | |
b76c8b19 | 96 | omap_subsys_initcall(omap_init_pmu); |