forked from Minki/linux
d44fa156dc
We can configure voltage controller for cpcap with the data available in Motorola Mapphone Android Linux kernel. Let's add it so we can have droid4 behave the same way for voltage controller as other omap4 devices and save some power when idle. Note that we're now using high-speed i2c mode, looks like the Motorola kernel had a typo using 0x200 instead of 200 for the timings which may caused it to not work properly. Also note that in the long run, this should just become dts data for a voltage controller device driver. But let's get things working first to make it possible to test further changes easily. Cc: Merlijn Wajer <merlijn@wizzup.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: Sebastian Reichel <sre@kernel.org> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Tony Lindgren <tony@atomide.com>
166 lines
3.1 KiB
C
166 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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 <linux/pm_opp.h>
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#include <linux/export.h>
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#include <linux/suspend.h>
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#include <linux/clk.h>
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#include <linux/cpu.h>
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#include <asm/system_misc.h>
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#include "omap_device.h"
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#include "common.h"
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#include "soc.h"
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#include "prcm-common.h"
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#include "voltage.h"
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#include "powerdomain.h"
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#include "clockdomain.h"
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#include "pm.h"
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#ifdef CONFIG_SUSPEND
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/*
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* omap_pm_suspend: points to a function that does the SoC-specific
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* suspend work
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*/
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static int (*omap_pm_suspend)(void);
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#endif
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#ifdef CONFIG_PM
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/**
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* struct omap2_oscillator - Describe the board main oscillator latencies
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* @startup_time: oscillator startup latency
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* @shutdown_time: oscillator shutdown latency
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*/
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struct omap2_oscillator {
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u32 startup_time;
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u32 shutdown_time;
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};
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static struct omap2_oscillator oscillator = {
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.startup_time = ULONG_MAX,
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.shutdown_time = ULONG_MAX,
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};
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void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
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{
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oscillator.startup_time = tstart;
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oscillator.shutdown_time = tshut;
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}
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void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
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{
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if (!tstart || !tshut)
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return;
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*tstart = oscillator.startup_time;
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*tshut = oscillator.shutdown_time;
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}
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#endif
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int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
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{
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clkdm_allow_idle(clkdm);
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return 0;
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}
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#ifdef CONFIG_SUSPEND
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static int omap_pm_enter(suspend_state_t suspend_state)
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{
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int ret = 0;
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if (!omap_pm_suspend)
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return -ENOENT; /* XXX doublecheck */
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switch (suspend_state) {
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case PM_SUSPEND_MEM:
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ret = omap_pm_suspend();
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static int omap_pm_begin(suspend_state_t state)
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{
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cpu_idle_poll_ctrl(true);
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if (soc_is_omap34xx())
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omap_prcm_irq_prepare();
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return 0;
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}
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static void omap_pm_end(void)
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{
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cpu_idle_poll_ctrl(false);
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}
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static void omap_pm_wake(void)
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{
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if (soc_is_omap34xx())
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omap_prcm_irq_complete();
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}
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static const struct platform_suspend_ops omap_pm_ops = {
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.begin = omap_pm_begin,
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.end = omap_pm_end,
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.enter = omap_pm_enter,
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.wake = omap_pm_wake,
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.valid = suspend_valid_only_mem,
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};
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/**
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* omap_common_suspend_init - Set common suspend routines for OMAP SoCs
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* @pm_suspend: function pointer to SoC specific suspend function
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*/
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void omap_common_suspend_init(void *pm_suspend)
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{
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omap_pm_suspend = pm_suspend;
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suspend_set_ops(&omap_pm_ops);
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}
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#endif /* CONFIG_SUSPEND */
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int __maybe_unused omap_pm_nop_init(void)
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{
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return 0;
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}
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int (*omap_pm_soc_init)(void);
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int __init omap2_common_pm_late_init(void)
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{
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int error;
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if (!omap_pm_soc_init)
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return 0;
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/* Init the voltage layer */
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omap3_twl_init();
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omap4_twl_init();
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omap4_cpcap_init();
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omap_voltage_late_init();
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/* Smartreflex device init */
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omap_devinit_smartreflex();
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error = omap_pm_soc_init();
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if (error)
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pr_warn("%s: pm soc init failed: %i\n", __func__, error);
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omap2_clk_enable_autoidle_all();
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return 0;
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}
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omap_late_initcall(omap2_common_pm_late_init);
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