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76a5d9bfc4
OMAP4460 and OMAP4470 devices have dedicated PMU interrupts and so add these interrupts to the MPU HWMOD so we can use these for PMU events on these devices. The PMU interrupts need to be the first interrupts in the array of interrupts as the ARM PMU driver assumes this. By using these dedicated interrupts we only need to enable the MPU and DEBUG sub-systems for PMU to work. This is different to OMAP4430 that did not have dedicated interrupts and required other power domains in addition to the DEBUG sub-system to be enabled so we could route the PMU events to the CTI interrupts. Hence, OMAP4460 and OMAP4470 devices can use the same list of HWMODs to create the PMU device that is using by OMAP3. Cc: Ming Lei <ming.lei@canonical.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Benoit Cousson <b-cousson@ti.com> Cc: Paul Walmsley <paul@pwsan.com> Cc: Kevin Hilman <khilman@ti.com> Signed-off-by: Jon Hunter <jon-hunter@ti.com> [paul@pwsan.com: updated to apply] Signed-off-by: Paul Walmsley <paul@pwsan.com>
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/*
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* OMAP2 ARM Performance Monitoring Unit (PMU) Support
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*
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* Copyright (C) 2012 Texas Instruments, Inc.
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*
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* Contacts:
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* Jon Hunter <jon-hunter@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/pm_runtime.h>
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#include <asm/pmu.h>
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#include <plat/omap_hwmod.h>
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#include <plat/omap_device.h>
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static char *omap2_pmu_oh_names[] = {"mpu"};
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static char *omap3_pmu_oh_names[] = {"mpu", "debugss"};
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static char *omap4430_pmu_oh_names[] = {"l3_main_3", "l3_instr", "debugss"};
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static struct platform_device *omap_pmu_dev;
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/**
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* omap2_init_pmu - creates and registers PMU platform device
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* @oh_num: Number of OMAP HWMODs required to create PMU device
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* @oh_names: Array of OMAP HWMODS names required to create PMU device
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*
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* Uses OMAP HWMOD framework to create and register an ARM PMU device
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* from a list of HWMOD names passed. Currently supports OMAP2, OMAP3
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* and OMAP4 devices.
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*/
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static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[])
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{
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int i;
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struct omap_hwmod *oh[3];
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char *dev_name = "arm-pmu";
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if ((!oh_num) || (oh_num > 3))
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return -EINVAL;
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for (i = 0; i < oh_num; i++) {
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oh[i] = omap_hwmod_lookup(oh_names[i]);
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if (!oh[i]) {
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pr_err("Could not look up %s hwmod\n", oh_names[i]);
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return -ENODEV;
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}
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}
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omap_pmu_dev = omap_device_build_ss(dev_name, -1, oh, oh_num, NULL, 0,
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NULL, 0, 0);
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WARN(IS_ERR(omap_pmu_dev), "Can't build omap_device for %s.\n",
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dev_name);
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if (IS_ERR(omap_pmu_dev))
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return PTR_ERR(omap_pmu_dev);
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pm_runtime_enable(&omap_pmu_dev->dev);
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return 0;
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}
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static int __init omap_init_pmu(void)
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{
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unsigned oh_num;
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char **oh_names;
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/*
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* To create an ARM-PMU device the following HWMODs
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* are required for the various OMAP2+ devices.
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*
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* OMAP24xx: mpu
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* OMAP3xxx: mpu, debugss
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* OMAP4430: l3_main_3, l3_instr, debugss
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* OMAP4460/70: mpu, debugss
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*/
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if (cpu_is_omap443x()) {
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oh_num = ARRAY_SIZE(omap4430_pmu_oh_names);
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oh_names = omap4430_pmu_oh_names;
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/* XXX Remove the next two lines when CTI driver available */
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pr_info("ARM PMU: not yet supported on OMAP4430 due to missing CTI driver\n");
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return 0;
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} else if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
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oh_num = ARRAY_SIZE(omap3_pmu_oh_names);
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oh_names = omap3_pmu_oh_names;
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} else {
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oh_num = ARRAY_SIZE(omap2_pmu_oh_names);
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oh_names = omap2_pmu_oh_names;
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}
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return omap2_init_pmu(oh_num, oh_names);
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}
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subsys_initcall(omap_init_pmu);
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