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 | */ |
| 14 | |
| 15 | #include <asm/pmu.h> |
| 16 | |
| 17 | #include <plat/omap_hwmod.h> |
| 18 | #include <plat/omap_device.h> |
| 19 | |
| 20 | static char *omap2_pmu_oh_names[] = {"mpu"}; |
| 21 | static char *omap3_pmu_oh_names[] = {"mpu", "debugss"}; |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame^] | 22 | static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"}; |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 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 |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame^] | 31 | * from a list of HWMOD names passed. Currently supports OMAP2, OMAP3 |
| 32 | * and OMAP4430 devices. |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 33 | */ |
| 34 | static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[]) |
| 35 | { |
| 36 | int i; |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame^] | 37 | struct omap_hwmod *oh[3]; |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 38 | char *dev_name = "arm-pmu"; |
| 39 | |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame^] | 40 | if ((!oh_num) || (oh_num > 3)) |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 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 | NULL, 0, 0); |
| 53 | WARN(IS_ERR(omap_pmu_dev), "Can't build omap_device for %s.\n", |
| 54 | dev_name); |
| 55 | |
| 56 | return IS_ERR(omap_pmu_dev) ? PTR_ERR(omap_pmu_dev) : 0; |
| 57 | } |
| 58 | |
| 59 | static int __init omap_init_pmu(void) |
| 60 | { |
| 61 | unsigned oh_num; |
| 62 | char **oh_names; |
| 63 | |
| 64 | /* |
| 65 | * To create an ARM-PMU device the following HWMODs |
| 66 | * are required for the various OMAP2+ devices. |
| 67 | * |
| 68 | * OMAP24xx: mpu |
| 69 | * OMAP3xxx: mpu, debugss |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame^] | 70 | * OMAP4430: l3_main_3, l3_instr, debugss |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 71 | */ |
| 72 | if (cpu_is_omap24xx()) { |
| 73 | oh_num = ARRAY_SIZE(omap2_pmu_oh_names); |
| 74 | oh_names = omap2_pmu_oh_names; |
| 75 | } else if (cpu_is_omap34xx()) { |
| 76 | oh_num = ARRAY_SIZE(omap3_pmu_oh_names); |
| 77 | oh_names = omap3_pmu_oh_names; |
Ming Lei | efc7f49 | 2012-09-23 17:28:29 -0600 | [diff] [blame^] | 78 | } else if (cpu_is_omap443x()) { |
| 79 | oh_num = ARRAY_SIZE(omap4430_pmu_oh_names); |
| 80 | oh_names = omap4430_pmu_oh_names; |
| 81 | /* XXX Remove the next two lines when CTI driver available */ |
| 82 | pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n"); |
| 83 | return 0; |
Jon Hunter | ee75d95 | 2012-09-23 17:28:29 -0600 | [diff] [blame] | 84 | } else { |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | return omap2_init_pmu(oh_num, oh_names); |
| 89 | } |
| 90 | subsys_initcall(omap_init_pmu); |