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8bd2294922
linux/arch/arm/mach-omap2/pm34xx.c
Kevin Hilman 8bd2294922 OMAP2/3: PM: push core PM code from linux-omap 
This patch is to sync the core linux-omap PM code with mainline.  This
code has evolved and been used for a while the linux-omap tree, but
the attempt here is to finally get this into mainline.

Following this will be a series of patches from the 'PM branch' of the
linux-omap tree to add full PM hardware support from the linux-omap
tree.

Much of this PM core code was written by Jouni Hogander with
significant contributions from Paul Walmsley as well as many others
from Nokia, Texas Instruments and linux-omap community.

Signed-off-by: Jouni Hogander <jouni.hogander@nokia.com>
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
2009-05-28 10:58:50 -07:00

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/*
* OMAP3 Power Management Routines
*
* Copyright (C) 2006-2008 Nokia Corporation
* Tony Lindgren <tony@atomide.com>
* Jouni Hogander
*
* Copyright (C) 2005 Texas Instruments, Inc.
* Richard Woodruff <r-woodruff2@ti.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/pm.h>
#include <linux/suspend.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <mach/sram.h>
#include <mach/clockdomain.h>
#include <mach/powerdomain.h>
#include <mach/control.h>
#include "cm.h"
#include "cm-regbits-34xx.h"
#include "prm-regbits-34xx.h"
#include "prm.h"
#include "pm.h"
struct power_state {
struct powerdomain *pwrdm;
u32 next_state;
u32 saved_state;
struct list_head node;
};
static LIST_HEAD(pwrst_list);
static void (*_omap_sram_idle)(u32 *addr, int save_state);
static struct powerdomain *mpu_pwrdm;
/* PRCM Interrupt Handler for wakeups */
static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
{
u32 wkst, irqstatus_mpu;
u32 fclk, iclk;
/* WKUP */
wkst = prm_read_mod_reg(WKUP_MOD, PM_WKST);
if (wkst) {
iclk = cm_read_mod_reg(WKUP_MOD, CM_ICLKEN);
fclk = cm_read_mod_reg(WKUP_MOD, CM_FCLKEN);
cm_set_mod_reg_bits(wkst, WKUP_MOD, CM_ICLKEN);
cm_set_mod_reg_bits(wkst, WKUP_MOD, CM_FCLKEN);
prm_write_mod_reg(wkst, WKUP_MOD, PM_WKST);
while (prm_read_mod_reg(WKUP_MOD, PM_WKST))
cpu_relax();
cm_write_mod_reg(iclk, WKUP_MOD, CM_ICLKEN);
cm_write_mod_reg(fclk, WKUP_MOD, CM_FCLKEN);
}
/* CORE */
wkst = prm_read_mod_reg(CORE_MOD, PM_WKST1);
if (wkst) {
iclk = cm_read_mod_reg(CORE_MOD, CM_ICLKEN1);
fclk = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
cm_set_mod_reg_bits(wkst, CORE_MOD, CM_ICLKEN1);
cm_set_mod_reg_bits(wkst, CORE_MOD, CM_FCLKEN1);
prm_write_mod_reg(wkst, CORE_MOD, PM_WKST1);
while (prm_read_mod_reg(CORE_MOD, PM_WKST1))
cpu_relax();
cm_write_mod_reg(iclk, CORE_MOD, CM_ICLKEN1);
cm_write_mod_reg(fclk, CORE_MOD, CM_FCLKEN1);
}
wkst = prm_read_mod_reg(CORE_MOD, OMAP3430ES2_PM_WKST3);
if (wkst) {
iclk = cm_read_mod_reg(CORE_MOD, CM_ICLKEN3);
fclk = cm_read_mod_reg(CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
cm_set_mod_reg_bits(wkst, CORE_MOD, CM_ICLKEN3);
cm_set_mod_reg_bits(wkst, CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
prm_write_mod_reg(wkst, CORE_MOD, OMAP3430ES2_PM_WKST3);
while (prm_read_mod_reg(CORE_MOD, OMAP3430ES2_PM_WKST3))
cpu_relax();
cm_write_mod_reg(iclk, CORE_MOD, CM_ICLKEN3);
cm_write_mod_reg(fclk, CORE_MOD, OMAP3430ES2_CM_FCLKEN3);
}
/* PER */
wkst = prm_read_mod_reg(OMAP3430_PER_MOD, PM_WKST);
if (wkst) {
iclk = cm_read_mod_reg(OMAP3430_PER_MOD, CM_ICLKEN);
fclk = cm_read_mod_reg(OMAP3430_PER_MOD, CM_FCLKEN);
cm_set_mod_reg_bits(wkst, OMAP3430_PER_MOD, CM_ICLKEN);
cm_set_mod_reg_bits(wkst, OMAP3430_PER_MOD, CM_FCLKEN);
prm_write_mod_reg(wkst, OMAP3430_PER_MOD, PM_WKST);
while (prm_read_mod_reg(OMAP3430_PER_MOD, PM_WKST))
cpu_relax();
cm_write_mod_reg(iclk, OMAP3430_PER_MOD, CM_ICLKEN);
cm_write_mod_reg(fclk, OMAP3430_PER_MOD, CM_FCLKEN);
}
if (omap_rev() > OMAP3430_REV_ES1_0) {
/* USBHOST */
wkst = prm_read_mod_reg(OMAP3430ES2_USBHOST_MOD, PM_WKST);
if (wkst) {
iclk = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
CM_ICLKEN);
fclk = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
CM_FCLKEN);
cm_set_mod_reg_bits(wkst, OMAP3430ES2_USBHOST_MOD,
CM_ICLKEN);
cm_set_mod_reg_bits(wkst, OMAP3430ES2_USBHOST_MOD,
CM_FCLKEN);
prm_write_mod_reg(wkst, OMAP3430ES2_USBHOST_MOD,
PM_WKST);
while (prm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
PM_WKST))
cpu_relax();
cm_write_mod_reg(iclk, OMAP3430ES2_USBHOST_MOD,
CM_ICLKEN);
cm_write_mod_reg(fclk, OMAP3430ES2_USBHOST_MOD,
CM_FCLKEN);
}
}
irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
while (prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET))
cpu_relax();
return IRQ_HANDLED;
}
static void omap_sram_idle(void)
{
/* Variable to tell what needs to be saved and restored
* in omap_sram_idle*/
/* save_state = 0 => Nothing to save and restored */
/* save_state = 1 => Only L1 and logic lost */
/* save_state = 2 => Only L2 lost */
/* save_state = 3 => L1, L2 and logic lost */
int save_state = 0, mpu_next_state;
if (!_omap_sram_idle)
return;
mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
switch (mpu_next_state) {
case PWRDM_POWER_RET:
/* No need to save context */
save_state = 0;
break;
default:
/* Invalid state */
printk(KERN_ERR "Invalid mpu state in sram_idle\n");
return;
}
omap2_gpio_prepare_for_retention();
_omap_sram_idle(NULL, save_state);
cpu_init();
omap2_gpio_resume_after_retention();
}
/*
* Check if functional clocks are enabled before entering
* sleep. This function could be behind CONFIG_PM_DEBUG
* when all drivers are configuring their sysconfig registers
* properly and using their clocks properly.
*/
static int omap3_fclks_active(void)
{
u32 fck_core1 = 0, fck_core3 = 0, fck_sgx = 0, fck_dss = 0,
fck_cam = 0, fck_per = 0, fck_usbhost = 0;
fck_core1 = cm_read_mod_reg(CORE_MOD,
CM_FCLKEN1);
if (omap_rev() > OMAP3430_REV_ES1_0) {
fck_core3 = cm_read_mod_reg(CORE_MOD,
OMAP3430ES2_CM_FCLKEN3);
fck_sgx = cm_read_mod_reg(OMAP3430ES2_SGX_MOD,
CM_FCLKEN);
fck_usbhost = cm_read_mod_reg(OMAP3430ES2_USBHOST_MOD,
CM_FCLKEN);
} else
fck_sgx = cm_read_mod_reg(GFX_MOD,
OMAP3430ES2_CM_FCLKEN3);
fck_dss = cm_read_mod_reg(OMAP3430_DSS_MOD,
CM_FCLKEN);
fck_cam = cm_read_mod_reg(OMAP3430_CAM_MOD,
CM_FCLKEN);
fck_per = cm_read_mod_reg(OMAP3430_PER_MOD,
CM_FCLKEN);
if (fck_core1 | fck_core3 | fck_sgx | fck_dss |
fck_cam | fck_per | fck_usbhost)
return 1;
return 0;
}
static int omap3_can_sleep(void)
{
if (omap3_fclks_active())
return 0;
return 1;
}
/* This sets pwrdm state (other than mpu & core. Currently only ON &
* RET are supported. Function is assuming that clkdm doesn't have
* hw_sup mode enabled. */
static int set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
{
u32 cur_state;
int sleep_switch = 0;
int ret = 0;
if (pwrdm == NULL || IS_ERR(pwrdm))
return -EINVAL;
while (!(pwrdm->pwrsts & (1 << state))) {
if (state == PWRDM_POWER_OFF)
return ret;
state--;
}
cur_state = pwrdm_read_next_pwrst(pwrdm);
if (cur_state == state)
return ret;
if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
sleep_switch = 1;
pwrdm_wait_transition(pwrdm);
}
ret = pwrdm_set_next_pwrst(pwrdm, state);
if (ret) {
printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
pwrdm->name);
goto err;
}
if (sleep_switch) {
omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
pwrdm_wait_transition(pwrdm);
}
err:
return ret;
}
static void omap3_pm_idle(void)
{
local_irq_disable();
local_fiq_disable();
if (!omap3_can_sleep())
goto out;
if (omap_irq_pending())
goto out;
omap_sram_idle();
out:
local_fiq_enable();
local_irq_enable();
}
static int omap3_pm_prepare(void)
{
disable_hlt();
return 0;
}
static int omap3_pm_suspend(void)
{
struct power_state *pwrst;
int state, ret = 0;
/* Read current next_pwrsts */
list_for_each_entry(pwrst, &pwrst_list, node)
pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
/* Set ones wanted by suspend */
list_for_each_entry(pwrst, &pwrst_list, node) {
if (set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
goto restore;
if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
goto restore;
}
omap_sram_idle();
restore:
/* Restore next_pwrsts */
list_for_each_entry(pwrst, &pwrst_list, node) {
set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
if (state > pwrst->next_state) {
printk(KERN_INFO "Powerdomain (%s) didn't enter "
"target state %d\n",
pwrst->pwrdm->name, pwrst->next_state);
ret = -1;
}
}
if (ret)
printk(KERN_ERR "Could not enter target state in pm_suspend\n");
else
printk(KERN_INFO "Successfully put all powerdomains "
"to target state\n");
return ret;
}
static int omap3_pm_enter(suspend_state_t state)
{
int ret = 0;
switch (state) {
case PM_SUSPEND_STANDBY:
case PM_SUSPEND_MEM:
ret = omap3_pm_suspend();
break;
default:
ret = -EINVAL;
}
return ret;
}
static void omap3_pm_finish(void)
{
enable_hlt();
}
static struct platform_suspend_ops omap_pm_ops = {
.prepare = omap3_pm_prepare,
.enter = omap3_pm_enter,
.finish = omap3_pm_finish,
.valid = suspend_valid_only_mem,
};
static void __init prcm_setup_regs(void)
{
/* reset modem */
prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON |
OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST,
CORE_MOD, RM_RSTCTRL);
prm_write_mod_reg(0, CORE_MOD, RM_RSTCTRL);
/* XXX Reset all wkdeps. This should be done when initializing
* powerdomains */
prm_write_mod_reg(0, OMAP3430_IVA2_MOD, PM_WKDEP);
prm_write_mod_reg(0, MPU_MOD, PM_WKDEP);
prm_write_mod_reg(0, OMAP3430_DSS_MOD, PM_WKDEP);
prm_write_mod_reg(0, OMAP3430_NEON_MOD, PM_WKDEP);
prm_write_mod_reg(0, OMAP3430_CAM_MOD, PM_WKDEP);
prm_write_mod_reg(0, OMAP3430_PER_MOD, PM_WKDEP);
if (omap_rev() > OMAP3430_REV_ES1_0) {
prm_write_mod_reg(0, OMAP3430ES2_SGX_MOD, PM_WKDEP);
prm_write_mod_reg(0, OMAP3430ES2_USBHOST_MOD, PM_WKDEP);
} else
prm_write_mod_reg(0, GFX_MOD, PM_WKDEP);
/*
* Enable interface clock autoidle for all modules.
* Note that in the long run this should be done by clockfw
*/
cm_write_mod_reg(
OMAP3430ES2_AUTO_MMC3 |
OMAP3430ES2_AUTO_ICR |
OMAP3430_AUTO_AES2 |
OMAP3430_AUTO_SHA12 |
OMAP3430_AUTO_DES2 |
OMAP3430_AUTO_MMC2 |
OMAP3430_AUTO_MMC1 |
OMAP3430_AUTO_MSPRO |
OMAP3430_AUTO_HDQ |
OMAP3430_AUTO_MCSPI4 |
OMAP3430_AUTO_MCSPI3 |
OMAP3430_AUTO_MCSPI2 |
OMAP3430_AUTO_MCSPI1 |
OMAP3430_AUTO_I2C3 |
OMAP3430_AUTO_I2C2 |
OMAP3430_AUTO_I2C1 |
OMAP3430_AUTO_UART2 |
OMAP3430_AUTO_UART1 |
OMAP3430_AUTO_GPT11 |
OMAP3430_AUTO_GPT10 |
OMAP3430_AUTO_MCBSP5 |
OMAP3430_AUTO_MCBSP1 |
OMAP3430ES1_AUTO_FAC | /* This is es1 only */
OMAP3430_AUTO_MAILBOXES |
OMAP3430_AUTO_OMAPCTRL |
OMAP3430ES1_AUTO_FSHOSTUSB |
OMAP3430_AUTO_HSOTGUSB |
OMAP3430ES1_AUTO_D2D | /* This is es1 only */
OMAP3430_AUTO_SSI,
CORE_MOD, CM_AUTOIDLE1);
cm_write_mod_reg(
OMAP3430_AUTO_PKA |
OMAP3430_AUTO_AES1 |
OMAP3430_AUTO_RNG |
OMAP3430_AUTO_SHA11 |
OMAP3430_AUTO_DES1,
CORE_MOD, CM_AUTOIDLE2);
if (omap_rev() > OMAP3430_REV_ES1_0) {
cm_write_mod_reg(
OMAP3430ES2_AUTO_USBTLL,
CORE_MOD, CM_AUTOIDLE3);
}
cm_write_mod_reg(
OMAP3430_AUTO_WDT2 |
OMAP3430_AUTO_WDT1 |
OMAP3430_AUTO_GPIO1 |
OMAP3430_AUTO_32KSYNC |
OMAP3430_AUTO_GPT12 |
OMAP3430_AUTO_GPT1 ,
WKUP_MOD, CM_AUTOIDLE);
cm_write_mod_reg(
OMAP3430_AUTO_DSS,
OMAP3430_DSS_MOD,
CM_AUTOIDLE);
cm_write_mod_reg(
OMAP3430_AUTO_CAM,
OMAP3430_CAM_MOD,
CM_AUTOIDLE);
cm_write_mod_reg(
OMAP3430_AUTO_GPIO6 |
OMAP3430_AUTO_GPIO5 |
OMAP3430_AUTO_GPIO4 |
OMAP3430_AUTO_GPIO3 |
OMAP3430_AUTO_GPIO2 |
OMAP3430_AUTO_WDT3 |
OMAP3430_AUTO_UART3 |
OMAP3430_AUTO_GPT9 |
OMAP3430_AUTO_GPT8 |
OMAP3430_AUTO_GPT7 |
OMAP3430_AUTO_GPT6 |
OMAP3430_AUTO_GPT5 |
OMAP3430_AUTO_GPT4 |
OMAP3430_AUTO_GPT3 |
OMAP3430_AUTO_GPT2 |
OMAP3430_AUTO_MCBSP4 |
OMAP3430_AUTO_MCBSP3 |
OMAP3430_AUTO_MCBSP2,
OMAP3430_PER_MOD,
CM_AUTOIDLE);
if (omap_rev() > OMAP3430_REV_ES1_0) {
cm_write_mod_reg(
OMAP3430ES2_AUTO_USBHOST,
OMAP3430ES2_USBHOST_MOD,
CM_AUTOIDLE);
}
/*
* Set all plls to autoidle. This is needed until autoidle is
* enabled by clockfw
*/
cm_write_mod_reg(1 << OMAP3430_AUTO_IVA2_DPLL_SHIFT,
OMAP3430_IVA2_MOD, CM_AUTOIDLE2);
cm_write_mod_reg(1 << OMAP3430_AUTO_MPU_DPLL_SHIFT,
MPU_MOD,
CM_AUTOIDLE2);
cm_write_mod_reg((1 << OMAP3430_AUTO_PERIPH_DPLL_SHIFT) |
(1 << OMAP3430_AUTO_CORE_DPLL_SHIFT),
PLL_MOD,
CM_AUTOIDLE);
cm_write_mod_reg(1 << OMAP3430ES2_AUTO_PERIPH2_DPLL_SHIFT,
PLL_MOD,
CM_AUTOIDLE2);
/*
* Enable control of expternal oscillator through
* sys_clkreq. In the long run clock framework should
* take care of this.
*/
prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
1 << OMAP_AUTOEXTCLKMODE_SHIFT,
OMAP3430_GR_MOD,
OMAP3_PRM_CLKSRC_CTRL_OFFSET);
/* setup wakup source */
prm_write_mod_reg(OMAP3430_EN_IO | OMAP3430_EN_GPIO1 |
OMAP3430_EN_GPT1 | OMAP3430_EN_GPT12,
WKUP_MOD, PM_WKEN);
/* No need to write EN_IO, that is always enabled */
prm_write_mod_reg(OMAP3430_EN_GPIO1 | OMAP3430_EN_GPT1 |
OMAP3430_EN_GPT12,
WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
/* For some reason IO doesn't generate wakeup event even if
* it is selected to mpu wakeup goup */
prm_write_mod_reg(OMAP3430_IO_EN | OMAP3430_WKUP_EN,
OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
}
static int __init pwrdms_setup(struct powerdomain *pwrdm)
{
struct power_state *pwrst;
if (!pwrdm->pwrsts)
return 0;
pwrst = kmalloc(sizeof(struct power_state), GFP_KERNEL);
if (!pwrst)
return -ENOMEM;
pwrst->pwrdm = pwrdm;
pwrst->next_state = PWRDM_POWER_RET;
list_add(&pwrst->node, &pwrst_list);
if (pwrdm_has_hdwr_sar(pwrdm))
pwrdm_enable_hdwr_sar(pwrdm);
return set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
}
/*
* Enable hw supervised mode for all clockdomains if it's
* supported. Initiate sleep transition for other clockdomains, if
* they are not used
*/
static int __init clkdms_setup(struct clockdomain *clkdm)
{
if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
omap2_clkdm_allow_idle(clkdm);
else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
atomic_read(&clkdm->usecount) == 0)
omap2_clkdm_sleep(clkdm);
return 0;
}
int __init omap3_pm_init(void)
{
struct power_state *pwrst, *tmp;
int ret;
if (!cpu_is_omap34xx())
return -ENODEV;
printk(KERN_ERR "Power Management for TI OMAP3.\n");
/* XXX prcm_setup_regs needs to be before enabling hw
* supervised mode for powerdomains */
prcm_setup_regs();
ret = request_irq(INT_34XX_PRCM_MPU_IRQ,
(irq_handler_t)prcm_interrupt_handler,
IRQF_DISABLED, "prcm", NULL);
if (ret) {
printk(KERN_ERR "request_irq failed to register for 0x%x\n",
INT_34XX_PRCM_MPU_IRQ);
goto err1;
}
ret = pwrdm_for_each(pwrdms_setup);
if (ret) {
printk(KERN_ERR "Failed to setup powerdomains\n");
goto err2;
}
(void) clkdm_for_each(clkdms_setup);
mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
if (mpu_pwrdm == NULL) {
printk(KERN_ERR "Failed to get mpu_pwrdm\n");
goto err2;
}
_omap_sram_idle = omap_sram_push(omap34xx_cpu_suspend,
omap34xx_cpu_suspend_sz);
suspend_set_ops(&omap_pm_ops);
pm_idle = omap3_pm_idle;
err1:
return ret;
err2:
free_irq(INT_34XX_PRCM_MPU_IRQ, NULL);
list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
list_del(&pwrst->node);
kfree(pwrst);
}
return ret;
}
late_initcall(omap3_pm_init);
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