Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 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 | */ |
Jon Hunter | 6a9bce2 | 2012-09-23 17:28:30 -0600 | [diff] [blame] | 14 | #include <linux/pm_runtime.h> |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 15 | |
| 16 | #include <asm/pmu.h> |
| 17 | |
Tony Lindgren | 2a296c8 | 2012-10-02 17:41:35 -0700 | [diff] [blame] | 18 | #include "omap_hwmod.h" |
Tony Lindgren | 25c7d49 | 2012-10-02 17:25:48 -0700 | [diff] [blame] | 19 | #include "omap_device.h" |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 20 | |
| 21 | static char *omap2_pmu_oh_names[] = {"mpu"}; |
| 22 | static char *omap3_pmu_oh_names[] = {"mpu", "debugss"}; |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 23 | static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"}; |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 24 | static 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 Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 32 | * from a list of HWMOD names passed. Currently supports OMAP2, OMAP3 |
Jon Hunter | 76a5d9b | 2012-09-23 17:28:30 -0600 | [diff] [blame] | 33 | * and OMAP4 devices. |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 34 | */ |
| 35 | static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[]) |
| 36 | { |
| 37 | int i; |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 38 | struct omap_hwmod *oh[3]; |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 39 | char *dev_name = "arm-pmu"; |
| 40 | |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 41 | if ((!oh_num) || (oh_num > 3)) |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 42 | 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 Hunter | 6a9bce2 | 2012-09-23 17:28:30 -0600 | [diff] [blame] | 57 | 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 Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 63 | } |
| 64 | |
| 65 | static 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 Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 76 | * OMAP4430: l3_main_3, l3_instr, debugss |
Jon Hunter | 76a5d9b | 2012-09-23 17:28:30 -0600 | [diff] [blame] | 77 | * OMAP4460/70: mpu, debugss |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 78 | */ |
Jon Hunter | 76a5d9b | 2012-09-23 17:28:30 -0600 | [diff] [blame] | 79 | if (cpu_is_omap443x()) { |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 80 | 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 Hunter | 76a5d9b | 2012-09-23 17:28:30 -0600 | [diff] [blame] | 85 | } 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 Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 88 | } else { |
Jon Hunter | 76a5d9b | 2012-09-23 17:28:30 -0600 | [diff] [blame] | 89 | oh_num = ARRAY_SIZE(omap2_pmu_oh_names); |
| 90 | oh_names = omap2_pmu_oh_names; |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | return omap2_init_pmu(oh_num, oh_names); |
| 94 | } |
| 95 | subsys_initcall(omap_init_pmu); |