1cbbe37ac5
omap2_common_pm_init is the API where generic system devices like mpu, l3 etc get initialized. This has to happen really early on during the boot and not at a later time. This is especially important with the new opp changes as these devices need to be built before the opp tables init happen. Today both are device initcalls and it works just because of the order of compilation. Making this postcore_initcall is ideal because the omap device layer init happens as a core_initcall and typically rest of the driver/device inits are arch_initcall or something lower. Signed-off-by: Thara Gopinath <thara@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
147 lines
3.1 KiB
C
147 lines
3.1 KiB
C
/*
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* pm.c - Common OMAP2+ power management-related code
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*
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* Copyright (C) 2010 Texas Instruments, Inc.
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* Copyright (C) 2010 Nokia Corporation
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <plat/omap-pm.h>
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#include <plat/omap_device.h>
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#include <plat/common.h>
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#include <plat/powerdomain.h>
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#include <plat/clockdomain.h>
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static struct omap_device_pm_latency *pm_lats;
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static struct device *mpu_dev;
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static struct device *iva_dev;
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static struct device *l3_dev;
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static struct device *dsp_dev;
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struct device *omap2_get_mpuss_device(void)
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{
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WARN_ON_ONCE(!mpu_dev);
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return mpu_dev;
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}
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struct device *omap2_get_iva_device(void)
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{
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WARN_ON_ONCE(!iva_dev);
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return iva_dev;
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}
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struct device *omap2_get_l3_device(void)
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{
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WARN_ON_ONCE(!l3_dev);
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return l3_dev;
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}
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struct device *omap4_get_dsp_device(void)
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{
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WARN_ON_ONCE(!dsp_dev);
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return dsp_dev;
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}
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EXPORT_SYMBOL(omap4_get_dsp_device);
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/* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
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static int _init_omap_device(char *name, struct device **new_dev)
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{
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struct omap_hwmod *oh;
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struct omap_device *od;
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oh = omap_hwmod_lookup(name);
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if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
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__func__, name))
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return -ENODEV;
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od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
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if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n",
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__func__, name))
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return -ENODEV;
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*new_dev = &od->pdev.dev;
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return 0;
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}
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/*
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* Build omap_devices for processors and bus.
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*/
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static void omap2_init_processor_devices(void)
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{
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_init_omap_device("mpu", &mpu_dev);
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_init_omap_device("iva", &iva_dev);
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if (cpu_is_omap44xx()) {
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_init_omap_device("l3_main_1", &l3_dev);
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_init_omap_device("dsp", &dsp_dev);
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} else {
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_init_omap_device("l3_main", &l3_dev);
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}
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}
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/*
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* This sets pwrdm state (other than mpu & core. Currently only ON &
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* RET are supported. Function is assuming that clkdm doesn't have
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* hw_sup mode enabled.
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*/
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int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
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{
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u32 cur_state;
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int sleep_switch = 0;
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int ret = 0;
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if (pwrdm == NULL || IS_ERR(pwrdm))
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return -EINVAL;
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while (!(pwrdm->pwrsts & (1 << state))) {
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if (state == PWRDM_POWER_OFF)
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return ret;
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state--;
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}
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cur_state = pwrdm_read_next_pwrst(pwrdm);
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if (cur_state == state)
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return ret;
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if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
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omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
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sleep_switch = 1;
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pwrdm_wait_transition(pwrdm);
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}
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ret = pwrdm_set_next_pwrst(pwrdm, state);
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if (ret) {
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printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
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pwrdm->name);
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goto err;
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}
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if (sleep_switch) {
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omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
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pwrdm_wait_transition(pwrdm);
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pwrdm_state_switch(pwrdm);
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}
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err:
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return ret;
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}
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static int __init omap2_common_pm_init(void)
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{
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omap2_init_processor_devices();
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omap_pm_if_init();
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return 0;
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}
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postcore_initcall(omap2_common_pm_init);
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