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alistair23-linux/arch/arm/mach-omap2/pm24xx.c
Dave Gerlach 2e4b62dc5e ARM: OMAP2+: Remove suspend_set_ops from common pm late init 
In omap2_common_pm_late_init suspend_set_ops was called to set common
suspend handling functions for all omap platforms. This created two
problems. First, these suspend ops were being set for all platforms,
regardless of whether or not suspend support has been integrated so in
the case of AM33XX, suspend to mem was presented as available but
failed every time. Second, some platforms will need to define a
completely separate set of suspend ops, such as AM33XX, due to
differences from previous omap platforms so there is no need to
always set the common omap ops.

This patch moves the suspend_set_ops call from omap2_common_pm_late_init
into a separate function that then gets called in the omap*_pm_init
functions for each platform.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-05-19 15:31:54 -07:00

321 lines
8.1 KiB
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/*
* OMAP2 Power Management Routines
*
* Copyright (C) 2005 Texas Instruments, Inc.
* Copyright (C) 2006-2008 Nokia Corporation
*
* Written by:
* Richard Woodruff <r-woodruff2@ti.com>
* Tony Lindgren
* Juha Yrjola
* Amit Kucheria <amit.kucheria@nokia.com>
* Igor Stoppa <igor.stoppa@nokia.com>
*
* Based on pm.c for omap1
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/suspend.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/clk-provider.h>
#include <linux/irq.h>
#include <linux/time.h>
#include <linux/gpio.h>
#include <linux/platform_data/gpio-omap.h>
#include <asm/fncpy.h>
#include <asm/mach/time.h>
#include <asm/mach/irq.h>
#include <asm/mach-types.h>
#include <asm/system_misc.h>
#include <linux/omap-dma.h>
#include "soc.h"
#include "common.h"
#include "clock.h"
#include "prm2xxx.h"
#include "prm-regbits-24xx.h"
#include "cm2xxx.h"
#include "cm-regbits-24xx.h"
#include "sdrc.h"
#include "sram.h"
#include "pm.h"
#include "control.h"
#include "powerdomain.h"
#include "clockdomain.h"
static void (*omap2_sram_suspend)(u32 dllctrl, void __iomem *sdrc_dlla_ctrl,
void __iomem *sdrc_power);
static struct powerdomain *mpu_pwrdm, *core_pwrdm;
static struct clockdomain *dsp_clkdm, *mpu_clkdm, *wkup_clkdm, *gfx_clkdm;
static struct clk *osc_ck, *emul_ck;
static int omap2_enter_full_retention(void)
{
u32 l;
/* There is 1 reference hold for all children of the oscillator
* clock, the following will remove it. If no one else uses the
* oscillator itself it will be disabled if/when we enter retention
* mode.
*/
clk_disable(osc_ck);
/* Clear old wake-up events */
/* REVISIT: These write to reserved bits? */
omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);
pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
/* Workaround to kill USB */
l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) | OMAP24XX_USBSTANDBYCTRL;
omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0);
omap2_gpio_prepare_for_idle(0);
/* One last check for pending IRQs to avoid extra latency due
* to sleeping unnecessarily. */
if (omap_irq_pending())
goto no_sleep;
/* Jump to SRAM suspend code */
omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL),
OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL),
OMAP_SDRC_REGADDR(SDRC_POWER));
no_sleep:
omap2_gpio_resume_after_idle();
clk_enable(osc_ck);
/* clear CORE wake-up events */
omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
/* wakeup domain events - bit 1: GPT1, bit5 GPIO */
omap2_prm_clear_mod_reg_bits(0x4 | 0x1, WKUP_MOD, PM_WKST);
/* MPU domain wake events */
l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
if (l & 0x01)
omap2_prm_write_mod_reg(0x01, OCP_MOD,
OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
if (l & 0x20)
omap2_prm_write_mod_reg(0x20, OCP_MOD,
OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
/* Mask future PRCM-to-MPU interrupts */
omap2_prm_write_mod_reg(0x0, OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_ON);
return 0;
}
static int sti_console_enabled;
static int omap2_allow_mpu_retention(void)
{
if (!omap2xxx_cm_mpu_retention_allowed())
return 0;
if (sti_console_enabled)
return 0;
return 1;
}
static void omap2_enter_mpu_retention(void)
{
const int zero = 0;
/* The peripherals seem not to be able to wake up the MPU when
* it is in retention mode. */
if (omap2_allow_mpu_retention()) {
/* REVISIT: These write to reserved bits? */
omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);
/* Try to enter MPU retention */
pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
} else {
/* Block MPU retention */
pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
}
/* WFI */
asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (zero) : "memory", "cc");
pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
}
static int omap2_can_sleep(void)
{
if (omap2xxx_cm_fclks_active())
return 0;
if (__clk_is_enabled(osc_ck))
return 0;
if (omap_dma_running())
return 0;
return 1;
}
static void omap2_pm_idle(void)
{
if (!omap2_can_sleep()) {
if (omap_irq_pending())
return;
omap2_enter_mpu_retention();
return;
}
if (omap_irq_pending())
return;
omap2_enter_full_retention();
}
static void __init prcm_setup_regs(void)
{
int i, num_mem_banks;
struct powerdomain *pwrdm;
/*
* Enable autoidle
* XXX This should be handled by hwmod code or PRCM init code
*/
omap2_prm_write_mod_reg(OMAP24XX_AUTOIDLE_MASK, OCP_MOD,
OMAP2_PRCM_SYSCONFIG_OFFSET);
/*
* Set CORE powerdomain memory banks to retain their contents
* during RETENTION
*/
num_mem_banks = pwrdm_get_mem_bank_count(core_pwrdm);
for (i = 0; i < num_mem_banks; i++)
pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET);
pwrdm_set_logic_retst(core_pwrdm, PWRDM_POWER_RET);
pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
/* Force-power down DSP, GFX powerdomains */
pwrdm = clkdm_get_pwrdm(dsp_clkdm);
pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
pwrdm = clkdm_get_pwrdm(gfx_clkdm);
pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
/* Enable hardware-supervised idle for all clkdms */
clkdm_for_each(omap_pm_clkdms_setup, NULL);
clkdm_add_wkdep(mpu_clkdm, wkup_clkdm);
omap_common_suspend_init(omap2_enter_full_retention);
/* REVISIT: Configure number of 32 kHz clock cycles for sys_clk
* stabilisation */
omap2_prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
OMAP2_PRCM_CLKSSETUP_OFFSET);
/* Configure automatic voltage transition */
omap2_prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
OMAP2_PRCM_VOLTSETUP_OFFSET);
omap2_prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT_MASK |
(0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) |
OMAP24XX_MEMRETCTRL_MASK |
(0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) |
(0x0 << OMAP24XX_VOLT_LEVEL_SHIFT),
OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET);
/* Enable wake-up events */
omap2_prm_write_mod_reg(OMAP24XX_EN_GPIOS_MASK | OMAP24XX_EN_GPT1_MASK,
WKUP_MOD, PM_WKEN);
}
int __init omap2_pm_init(void)
{
u32 l;
printk(KERN_INFO "Power Management for OMAP2 initializing\n");
l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_REVISION_OFFSET);
printk(KERN_INFO "PRCM revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
/* Look up important powerdomains */
mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
if (!mpu_pwrdm)
pr_err("PM: mpu_pwrdm not found\n");
core_pwrdm = pwrdm_lookup("core_pwrdm");
if (!core_pwrdm)
pr_err("PM: core_pwrdm not found\n");
/* Look up important clockdomains */
mpu_clkdm = clkdm_lookup("mpu_clkdm");
if (!mpu_clkdm)
pr_err("PM: mpu_clkdm not found\n");
wkup_clkdm = clkdm_lookup("wkup_clkdm");
if (!wkup_clkdm)
pr_err("PM: wkup_clkdm not found\n");
dsp_clkdm = clkdm_lookup("dsp_clkdm");
if (!dsp_clkdm)
pr_err("PM: dsp_clkdm not found\n");
gfx_clkdm = clkdm_lookup("gfx_clkdm");
if (!gfx_clkdm)
pr_err("PM: gfx_clkdm not found\n");
osc_ck = clk_get(NULL, "osc_ck");
if (IS_ERR(osc_ck)) {
printk(KERN_ERR "could not get osc_ck\n");
return -ENODEV;
}
if (cpu_is_omap242x()) {
emul_ck = clk_get(NULL, "emul_ck");
if (IS_ERR(emul_ck)) {
printk(KERN_ERR "could not get emul_ck\n");
clk_put(osc_ck);
return -ENODEV;
}
}
prcm_setup_regs();
/*
* We copy the assembler sleep/wakeup routines to SRAM.
* These routines need to be in SRAM as that's the only
* memory the MPU can see when it wakes up after the entire
* chip enters idle.
*/
omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
omap24xx_cpu_suspend_sz);
arm_pm_idle = omap2_pm_idle;
return 0;
}
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