diff options
Diffstat (limited to 'arch/arm/mach-omap2/pmu.c')
| -rw-r--r-- | arch/arm/mach-omap2/pmu.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pmu.c b/arch/arm/mach-omap2/pmu.c new file mode 100644 index 00000000000..2a791766283 --- /dev/null +++ b/arch/arm/mach-omap2/pmu.c @@ -0,0 +1,95 @@ +/* + * OMAP2 ARM Performance Monitoring Unit (PMU) Support + * + * Copyright (C) 2012 Texas Instruments, Inc. + * + * Contacts: + * Jon Hunter <jon-hunter@ti.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#include <linux/pm_runtime.h> + +#include <asm/pmu.h> + +#include <plat/omap_hwmod.h> +#include <plat/omap_device.h> + +static char *omap2_pmu_oh_names[] = {"mpu"}; +static char *omap3_pmu_oh_names[] = {"mpu", "debugss"}; +static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"}; +static struct platform_device *omap_pmu_dev; + +/** + * omap2_init_pmu - creates and registers PMU platform device + * @oh_num: Number of OMAP HWMODs required to create PMU device + * @oh_names: Array of OMAP HWMODS names required to create PMU device + * + * Uses OMAP HWMOD framework to create and register an ARM PMU device + * from a list of HWMOD names passed. Currently supports OMAP2, OMAP3 + * and OMAP4 devices. + */ +static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[]) +{ + int i; + struct omap_hwmod *oh[3]; + char *dev_name = "arm-pmu"; + + if ((!oh_num) || (oh_num > 3)) + return -EINVAL; + + for (i = 0; i < oh_num; i++) { + oh[i] = omap_hwmod_lookup(oh_names[i]); + if (!oh[i]) { + pr_err("Could not look up %s hwmod\n", oh_names[i]); + return -ENODEV; + } + } + + omap_pmu_dev = omap_device_build_ss(dev_name, -1, oh, oh_num, NULL, 0, + NULL, 0, 0); + WARN(IS_ERR(omap_pmu_dev), "Can't build omap_device for %s.\n", + dev_name); + + if (IS_ERR(omap_pmu_dev)) + return PTR_ERR(omap_pmu_dev); + + pm_runtime_enable(&omap_pmu_dev->dev); + + return 0; +} + +static int __init omap_init_pmu(void) +{ + unsigned oh_num; + char **oh_names; + + /* + * To create an ARM-PMU device the following HWMODs + * are required for the various OMAP2+ devices. + * + * OMAP24xx: mpu + * OMAP3xxx: mpu, debugss + * OMAP4430: l3_main_3, l3_instr, debugss + * OMAP4460/70: mpu, debugss + */ + if (cpu_is_omap443x()) { + oh_num = ARRAY_SIZE(omap4430_pmu_oh_names); + oh_names = omap4430_pmu_oh_names; + /* XXX Remove the next two lines when CTI driver available */ + pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n"); + return 0; + } else if (cpu_is_omap34xx() || cpu_is_omap44xx()) { + oh_num = ARRAY_SIZE(omap3_pmu_oh_names); + oh_names = omap3_pmu_oh_names; + } else { + oh_num = ARRAY_SIZE(omap2_pmu_oh_names); + oh_names = omap2_pmu_oh_names; + } + + return omap2_init_pmu(oh_num, oh_names); +} +subsys_initcall(omap_init_pmu); |