linux/arch/arm/mach-omap2/pm34xx.c
Tony Lindgren 45c3eb7d3a ARM: OMAP: Move plat-omap/dma-omap.h to include/linux/omap-dma.h
Based on earlier discussions[1] we attempted to find a suitable
location for the omap DMA header in commit 2b6c4e73 (ARM: OMAP:
DMA: Move plat/dma.h to plat-omap/dma-omap.h) until the conversion
to dmaengine is complete.

Unfortunately that was before I was able to try to test compile
of the ARM multiplatform builds for omap2+, and the end result
was not very good.

So I'm creating yet another all over the place patch to cut the
last dependency for building omap2+ for ARM multiplatform. After
this, we have finally removed the driver dependencies to the
arch/arm code, except for few drivers that are being worked on.

The other option was to make the <plat-omap/dma-omap.h> path
to work, but we'd have to add some new header directory to for
multiplatform builds.

Or we would have to manually include arch/arm/plat-omap/include
again from arch/arm/Makefile for omap2+.

Neither of these alternatives sound appealing as they will
likely lead addition of various other headers exposed to the
drivers, which we want to avoid for the multiplatform kernels.

Since we already have a minimal include/linux/omap-dma.h,
let's just use that instead and add a note to it to not
use the custom omap DMA functions any longer where possible.

Note that converting omap DMA to dmaengine depends on
dmaengine supporting automatically incrementing the FIFO
address at the device end, and converting all the remaining
legacy drivers. So it's going to be few more merge windows.

[1] https://patchwork.kernel.org/patch/1519591/#

cc: Russell King <linux@arm.linux.org.uk>
cc: Kevin Hilman <khilman@ti.com>
cc: "Benoît Cousson" <b-cousson@ti.com>
cc: Herbert Xu <herbert@gondor.apana.org.au>
cc: "David S. Miller" <davem@davemloft.net>
cc: Vinod Koul <vinod.koul@intel.com>
cc: Dan Williams <djbw@fb.com>
cc: Mauro Carvalho Chehab <mchehab@infradead.org>
cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
cc: David Woodhouse <dwmw2@infradead.org>
cc: Kyungmin Park <kyungmin.park@samsung.com>
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
cc: Hans Verkuil <hans.verkuil@cisco.com>
cc: Vaibhav Hiremath <hvaibhav@ti.com>
cc: Lokesh Vutla <lokeshvutla@ti.com>
cc: Rusty Russell <rusty@rustcorp.com.au>
cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
cc: Afzal Mohammed <afzal@ti.com>
cc: linux-crypto@vger.kernel.org
cc: linux-media@vger.kernel.org
cc: linux-mtd@lists.infradead.org
cc: linux-usb@vger.kernel.org
cc: linux-fbdev@vger.kernel.org
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2012-11-30 08:41:50 -08:00

786 lines
22 KiB
C

/*
* OMAP3 Power Management Routines
*
* Copyright (C) 2006-2008 Nokia Corporation
* Tony Lindgren <tony@atomide.com>
* Jouni Hogander
*
* Copyright (C) 2007 Texas Instruments, Inc.
* Rajendra Nayak <rnayak@ti.com>
*
* 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 <linux/clk.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/omap-dma.h>
#include <linux/platform_data/gpio-omap.h>
#include <trace/events/power.h>
#include <asm/fncpy.h>
#include <asm/suspend.h>
#include <asm/system_misc.h>
#include "clockdomain.h"
#include "powerdomain.h"
#include "soc.h"
#include "common.h"
#include "cm3xxx.h"
#include "cm-regbits-34xx.h"
#include "gpmc.h"
#include "prm-regbits-34xx.h"
#include "prm3xxx.h"
#include "pm.h"
#include "sdrc.h"
#include "sram.h"
#include "control.h"
/* pm34xx errata defined in pm.h */
u16 pm34xx_errata;
struct power_state {
struct powerdomain *pwrdm;
u32 next_state;
#ifdef CONFIG_SUSPEND
u32 saved_state;
#endif
struct list_head node;
};
static LIST_HEAD(pwrst_list);
static int (*_omap_save_secure_sram)(u32 *addr);
void (*omap3_do_wfi_sram)(void);
static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
static struct powerdomain *core_pwrdm, *per_pwrdm;
static void omap3_core_save_context(void)
{
omap3_ctrl_save_padconf();
/*
* Force write last pad into memory, as this can fail in some
* cases according to errata 1.157, 1.185
*/
omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14),
OMAP343X_CONTROL_MEM_WKUP + 0x2a0);
/* Save the Interrupt controller context */
omap_intc_save_context();
/* Save the GPMC context */
omap3_gpmc_save_context();
/* Save the system control module context, padconf already save above*/
omap3_control_save_context();
omap_dma_global_context_save();
}
static void omap3_core_restore_context(void)
{
/* Restore the control module context, padconf restored by h/w */
omap3_control_restore_context();
/* Restore the GPMC context */
omap3_gpmc_restore_context();
/* Restore the interrupt controller context */
omap_intc_restore_context();
omap_dma_global_context_restore();
}
/*
* FIXME: This function should be called before entering off-mode after
* OMAP3 secure services have been accessed. Currently it is only called
* once during boot sequence, but this works as we are not using secure
* services.
*/
static void omap3_save_secure_ram_context(void)
{
u32 ret;
int mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
/*
* MPU next state must be set to POWER_ON temporarily,
* otherwise the WFI executed inside the ROM code
* will hang the system.
*/
pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
ret = _omap_save_secure_sram((u32 *)
__pa(omap3_secure_ram_storage));
pwrdm_set_next_pwrst(mpu_pwrdm, mpu_next_state);
/* Following is for error tracking, it should not happen */
if (ret) {
pr_err("save_secure_sram() returns %08x\n", ret);
while (1)
;
}
}
}
/*
* PRCM Interrupt Handler Helper Function
*
* The purpose of this function is to clear any wake-up events latched
* in the PRCM PM_WKST_x registers. It is possible that a wake-up event
* may occur whilst attempting to clear a PM_WKST_x register and thus
* set another bit in this register. A while loop is used to ensure
* that any peripheral wake-up events occurring while attempting to
* clear the PM_WKST_x are detected and cleared.
*/
static int prcm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits)
{
u32 wkst, fclk, iclk, clken;
u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
u16 grpsel_off = (regs == 3) ?
OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
int c = 0;
wkst = omap2_prm_read_mod_reg(module, wkst_off);
wkst &= omap2_prm_read_mod_reg(module, grpsel_off);
wkst &= ~ignore_bits;
if (wkst) {
iclk = omap2_cm_read_mod_reg(module, iclk_off);
fclk = omap2_cm_read_mod_reg(module, fclk_off);
while (wkst) {
clken = wkst;
omap2_cm_set_mod_reg_bits(clken, module, iclk_off);
/*
* For USBHOST, we don't know whether HOST1 or
* HOST2 woke us up, so enable both f-clocks
*/
if (module == OMAP3430ES2_USBHOST_MOD)
clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
omap2_cm_set_mod_reg_bits(clken, module, fclk_off);
omap2_prm_write_mod_reg(wkst, module, wkst_off);
wkst = omap2_prm_read_mod_reg(module, wkst_off);
wkst &= ~ignore_bits;
c++;
}
omap2_cm_write_mod_reg(iclk, module, iclk_off);
omap2_cm_write_mod_reg(fclk, module, fclk_off);
}
return c;
}
static irqreturn_t _prcm_int_handle_io(int irq, void *unused)
{
int c;
c = prcm_clear_mod_irqs(WKUP_MOD, 1,
~(OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK));
return c ? IRQ_HANDLED : IRQ_NONE;
}
static irqreturn_t _prcm_int_handle_wakeup(int irq, void *unused)
{
int c;
/*
* Clear all except ST_IO and ST_IO_CHAIN for wkup module,
* these are handled in a separate handler to avoid acking
* IO events before parsing in mux code
*/
c = prcm_clear_mod_irqs(WKUP_MOD, 1,
OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK);
c += prcm_clear_mod_irqs(CORE_MOD, 1, 0);
c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1, 0);
if (omap_rev() > OMAP3430_REV_ES1_0) {
c += prcm_clear_mod_irqs(CORE_MOD, 3, 0);
c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1, 0);
}
return c ? IRQ_HANDLED : IRQ_NONE;
}
static void omap34xx_save_context(u32 *save)
{
u32 val;
/* Read Auxiliary Control Register */
asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val));
*save++ = 1;
*save++ = val;
/* Read L2 AUX ctrl register */
asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val));
*save++ = 1;
*save++ = val;
}
static int omap34xx_do_sram_idle(unsigned long save_state)
{
omap34xx_cpu_suspend(save_state);
return 0;
}
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;
int mpu_next_state = PWRDM_POWER_ON;
int per_next_state = PWRDM_POWER_ON;
int core_next_state = PWRDM_POWER_ON;
int per_going_off;
int core_prev_state;
u32 sdrc_pwr = 0;
mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
switch (mpu_next_state) {
case PWRDM_POWER_ON:
case PWRDM_POWER_RET:
/* No need to save context */
save_state = 0;
break;
case PWRDM_POWER_OFF:
save_state = 3;
break;
default:
/* Invalid state */
pr_err("Invalid mpu state in sram_idle\n");
return;
}
/* NEON control */
if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state);
/* Enable IO-PAD and IO-CHAIN wakeups */
per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
pwrdm_pre_transition(NULL);
/* PER */
if (per_next_state < PWRDM_POWER_ON) {
per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0;
omap2_gpio_prepare_for_idle(per_going_off);
}
/* CORE */
if (core_next_state < PWRDM_POWER_ON) {
if (core_next_state == PWRDM_POWER_OFF) {
omap3_core_save_context();
omap3_cm_save_context();
}
}
omap3_intc_prepare_idle();
/*
* On EMU/HS devices ROM code restores a SRDC value
* from scratchpad which has automatic self refresh on timeout
* of AUTO_CNT = 1 enabled. This takes care of erratum ID i443.
* Hence store/restore the SDRC_POWER register here.
*/
if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
(omap_type() == OMAP2_DEVICE_TYPE_EMU ||
omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
core_next_state == PWRDM_POWER_OFF)
sdrc_pwr = sdrc_read_reg(SDRC_POWER);
/*
* omap3_arm_context is the location where some ARM context
* get saved. The rest is placed on the stack, and restored
* from there before resuming.
*/
if (save_state)
omap34xx_save_context(omap3_arm_context);
if (save_state == 1 || save_state == 3)
cpu_suspend(save_state, omap34xx_do_sram_idle);
else
omap34xx_do_sram_idle(save_state);
/* Restore normal SDRC POWER settings */
if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 &&
(omap_type() == OMAP2_DEVICE_TYPE_EMU ||
omap_type() == OMAP2_DEVICE_TYPE_SEC) &&
core_next_state == PWRDM_POWER_OFF)
sdrc_write_reg(sdrc_pwr, SDRC_POWER);
/* CORE */
if (core_next_state < PWRDM_POWER_ON) {
core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm);
if (core_prev_state == PWRDM_POWER_OFF) {
omap3_core_restore_context();
omap3_cm_restore_context();
omap3_sram_restore_context();
omap2_sms_restore_context();
}
if (core_next_state == PWRDM_POWER_OFF)
omap2_prm_clear_mod_reg_bits(OMAP3430_AUTO_OFF_MASK,
OMAP3430_GR_MOD,
OMAP3_PRM_VOLTCTRL_OFFSET);
}
omap3_intc_resume_idle();
pwrdm_post_transition(NULL);
/* PER */
if (per_next_state < PWRDM_POWER_ON)
omap2_gpio_resume_after_idle();
}
static void omap3_pm_idle(void)
{
local_fiq_disable();
if (omap_irq_pending())
goto out;
trace_power_start(POWER_CSTATE, 1, smp_processor_id());
trace_cpu_idle(1, smp_processor_id());
omap_sram_idle();
trace_power_end(smp_processor_id());
trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
out:
local_fiq_enable();
}
#ifdef CONFIG_SUSPEND
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 (omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state))
goto restore;
if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm))
goto restore;
}
omap3_intc_suspend();
omap_sram_idle();
restore:
/* Restore next_pwrsts */
list_for_each_entry(pwrst, &pwrst_list, node) {
state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
if (state > pwrst->next_state) {
pr_info("Powerdomain (%s) didn't enter target state %d\n",
pwrst->pwrdm->name, pwrst->next_state);
ret = -1;
}
omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
}
if (ret)
pr_err("Could not enter target state in pm_suspend\n");
else
pr_info("Successfully put all powerdomains to target state\n");
return ret;
}
#endif /* CONFIG_SUSPEND */
/**
* omap3_iva_idle(): ensure IVA is in idle so it can be put into
* retention
*
* In cases where IVA2 is activated by bootcode, it may prevent
* full-chip retention or off-mode because it is not idle. This
* function forces the IVA2 into idle state so it can go
* into retention/off and thus allow full-chip retention/off.
*
**/
static void __init omap3_iva_idle(void)
{
/* ensure IVA2 clock is disabled */
omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
/* if no clock activity, nothing else to do */
if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
OMAP3430_CLKACTIVITY_IVA2_MASK))
return;
/* Reset IVA2 */
omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
OMAP3430_RST2_IVA2_MASK |
OMAP3430_RST3_IVA2_MASK,
OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
/* Enable IVA2 clock */
omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK,
OMAP3430_IVA2_MOD, CM_FCLKEN);
/* Set IVA2 boot mode to 'idle' */
omap_ctrl_writel(OMAP3_IVA2_BOOTMOD_IDLE,
OMAP343X_CONTROL_IVA2_BOOTMOD);
/* Un-reset IVA2 */
omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
/* Disable IVA2 clock */
omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
/* Reset IVA2 */
omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
OMAP3430_RST2_IVA2_MASK |
OMAP3430_RST3_IVA2_MASK,
OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
}
static void __init omap3_d2d_idle(void)
{
u16 mask, padconf;
/* In a stand alone OMAP3430 where there is not a stacked
* modem for the D2D Idle Ack and D2D MStandby must be pulled
* high. S CONTROL_PADCONF_SAD2D_IDLEACK and
* CONTROL_PADCONF_SAD2D_MSTDBY to have a pull up. */
mask = (1 << 4) | (1 << 3); /* pull-up, enabled */
padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_MSTANDBY);
padconf |= mask;
omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_MSTANDBY);
padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_IDLEACK);
padconf |= mask;
omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_IDLEACK);
/* reset modem */
omap2_prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK |
OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK,
CORE_MOD, OMAP2_RM_RSTCTRL);
omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL);
}
static void __init prcm_setup_regs(void)
{
u32 omap3630_en_uart4_mask = cpu_is_omap3630() ?
OMAP3630_EN_UART4_MASK : 0;
u32 omap3630_grpsel_uart4_mask = cpu_is_omap3630() ?
OMAP3630_GRPSEL_UART4_MASK : 0;
/* XXX This should be handled by hwmod code or SCM init code */
omap_ctrl_writel(OMAP3430_AUTOIDLE_MASK, OMAP2_CONTROL_SYSCONFIG);
/*
* Enable control of expternal oscillator through
* sys_clkreq. In the long run clock framework should
* take care of this.
*/
omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
1 << OMAP_AUTOEXTCLKMODE_SHIFT,
OMAP3430_GR_MOD,
OMAP3_PRM_CLKSRC_CTRL_OFFSET);
/* setup wakup source */
omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK |
OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK,
WKUP_MOD, PM_WKEN);
/* No need to write EN_IO, that is always enabled */
omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK |
OMAP3430_GRPSEL_GPT1_MASK |
OMAP3430_GRPSEL_GPT12_MASK,
WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
/* Enable PM_WKEN to support DSS LPR */
omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK,
OMAP3430_DSS_MOD, PM_WKEN);
/* Enable wakeups in PER */
omap2_prm_write_mod_reg(omap3630_en_uart4_mask |
OMAP3430_EN_GPIO2_MASK | OMAP3430_EN_GPIO3_MASK |
OMAP3430_EN_GPIO4_MASK | OMAP3430_EN_GPIO5_MASK |
OMAP3430_EN_GPIO6_MASK | OMAP3430_EN_UART3_MASK |
OMAP3430_EN_MCBSP2_MASK | OMAP3430_EN_MCBSP3_MASK |
OMAP3430_EN_MCBSP4_MASK,
OMAP3430_PER_MOD, PM_WKEN);
/* and allow them to wake up MPU */
omap2_prm_write_mod_reg(omap3630_grpsel_uart4_mask |
OMAP3430_GRPSEL_GPIO2_MASK |
OMAP3430_GRPSEL_GPIO3_MASK |
OMAP3430_GRPSEL_GPIO4_MASK |
OMAP3430_GRPSEL_GPIO5_MASK |
OMAP3430_GRPSEL_GPIO6_MASK |
OMAP3430_GRPSEL_UART3_MASK |
OMAP3430_GRPSEL_MCBSP2_MASK |
OMAP3430_GRPSEL_MCBSP3_MASK |
OMAP3430_GRPSEL_MCBSP4_MASK,
OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);
/* Don't attach IVA interrupts */
if (omap3_has_iva()) {
omap2_prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD,
OMAP3430_PM_IVAGRPSEL);
}
/* Clear any pending 'reset' flags */
omap2_prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST);
omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST);
omap2_prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST);
omap2_prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST);
omap2_prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST);
omap2_prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST);
omap2_prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, OMAP2_RM_RSTST);
/* Clear any pending PRCM interrupts */
omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
if (omap3_has_iva())
omap3_iva_idle();
omap3_d2d_idle();
}
void omap3_pm_off_mode_enable(int enable)
{
struct power_state *pwrst;
u32 state;
if (enable)
state = PWRDM_POWER_OFF;
else
state = PWRDM_POWER_RET;
list_for_each_entry(pwrst, &pwrst_list, node) {
if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) &&
pwrst->pwrdm == core_pwrdm &&
state == PWRDM_POWER_OFF) {
pwrst->next_state = PWRDM_POWER_RET;
pr_warn("%s: Core OFF disabled due to errata i583\n",
__func__);
} else {
pwrst->next_state = state;
}
omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
}
}
int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
{
struct power_state *pwrst;
list_for_each_entry(pwrst, &pwrst_list, node) {
if (pwrst->pwrdm == pwrdm)
return pwrst->next_state;
}
return -EINVAL;
}
int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
{
struct power_state *pwrst;
list_for_each_entry(pwrst, &pwrst_list, node) {
if (pwrst->pwrdm == pwrdm) {
pwrst->next_state = state;
return 0;
}
}
return -EINVAL;
}
static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
{
struct power_state *pwrst;
if (!pwrdm->pwrsts)
return 0;
pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
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 omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
}
/*
* Push functions to SRAM
*
* The minimum set of functions is pushed to SRAM for execution:
* - omap3_do_wfi for erratum i581 WA,
* - save_secure_ram_context for security extensions.
*/
void omap_push_sram_idle(void)
{
omap3_do_wfi_sram = omap_sram_push(omap3_do_wfi, omap3_do_wfi_sz);
if (omap_type() != OMAP2_DEVICE_TYPE_GP)
_omap_save_secure_sram = omap_sram_push(save_secure_ram_context,
save_secure_ram_context_sz);
}
static void __init pm_errata_configure(void)
{
if (cpu_is_omap3630()) {
pm34xx_errata |= PM_RTA_ERRATUM_i608;
/* Enable the l2 cache toggling in sleep logic */
enable_omap3630_toggle_l2_on_restore();
if (omap_rev() < OMAP3630_REV_ES1_2)
pm34xx_errata |= (PM_SDRC_WAKEUP_ERRATUM_i583 |
PM_PER_MEMORIES_ERRATUM_i582);
} else if (cpu_is_omap34xx()) {
pm34xx_errata |= PM_PER_MEMORIES_ERRATUM_i582;
}
}
int __init omap3_pm_init(void)
{
struct power_state *pwrst, *tmp;
struct clockdomain *neon_clkdm, *mpu_clkdm, *per_clkdm, *wkup_clkdm;
int ret;
if (!omap3_has_io_chain_ctrl())
pr_warning("PM: no software I/O chain control; some wakeups may be lost\n");
pm_errata_configure();
/* XXX prcm_setup_regs needs to be before enabling hw
* supervised mode for powerdomains */
prcm_setup_regs();
ret = request_irq(omap_prcm_event_to_irq("wkup"),
_prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL);
if (ret) {
pr_err("pm: Failed to request pm_wkup irq\n");
goto err1;
}
/* IO interrupt is shared with mux code */
ret = request_irq(omap_prcm_event_to_irq("io"),
_prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io",
omap3_pm_init);
enable_irq(omap_prcm_event_to_irq("io"));
if (ret) {
pr_err("pm: Failed to request pm_io irq\n");
goto err2;
}
ret = pwrdm_for_each(pwrdms_setup, NULL);
if (ret) {
pr_err("Failed to setup powerdomains\n");
goto err3;
}
(void) clkdm_for_each(omap_pm_clkdms_setup, NULL);
mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
if (mpu_pwrdm == NULL) {
pr_err("Failed to get mpu_pwrdm\n");
ret = -EINVAL;
goto err3;
}
neon_pwrdm = pwrdm_lookup("neon_pwrdm");
per_pwrdm = pwrdm_lookup("per_pwrdm");
core_pwrdm = pwrdm_lookup("core_pwrdm");
neon_clkdm = clkdm_lookup("neon_clkdm");
mpu_clkdm = clkdm_lookup("mpu_clkdm");
per_clkdm = clkdm_lookup("per_clkdm");
wkup_clkdm = clkdm_lookup("wkup_clkdm");
#ifdef CONFIG_SUSPEND
omap_pm_suspend = omap3_pm_suspend;
#endif
arm_pm_idle = omap3_pm_idle;
omap3_idle_init();
/*
* RTA is disabled during initialization as per erratum i608
* it is safer to disable RTA by the bootloader, but we would like
* to be doubly sure here and prevent any mishaps.
*/
if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608))
omap3630_ctrl_disable_rta();
/*
* The UART3/4 FIFO and the sidetone memory in McBSP2/3 are
* not correctly reset when the PER powerdomain comes back
* from OFF or OSWR when the CORE powerdomain is kept active.
* See OMAP36xx Erratum i582 "PER Domain reset issue after
* Domain-OFF/OSWR Wakeup". This wakeup dependency is not a
* complete workaround. The kernel must also prevent the PER
* powerdomain from going to OSWR/OFF while the CORE
* powerdomain is not going to OSWR/OFF. And if PER last
* power state was off while CORE last power state was ON, the
* UART3/4 and McBSP2/3 SIDETONE devices need to run a
* self-test using their loopback tests; if that fails, those
* devices are unusable until the PER/CORE can complete a transition
* from ON to OSWR/OFF and then back to ON.
*
* XXX Technically this workaround is only needed if off-mode
* or OSWR is enabled.
*/
if (IS_PM34XX_ERRATUM(PM_PER_MEMORIES_ERRATUM_i582))
clkdm_add_wkdep(per_clkdm, wkup_clkdm);
clkdm_add_wkdep(neon_clkdm, mpu_clkdm);
if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
omap3_secure_ram_storage =
kmalloc(0x803F, GFP_KERNEL);
if (!omap3_secure_ram_storage)
pr_err("Memory allocation failed when allocating for secure sram context\n");
local_irq_disable();
local_fiq_disable();
omap_dma_global_context_save();
omap3_save_secure_ram_context();
omap_dma_global_context_restore();
local_irq_enable();
local_fiq_enable();
}
omap3_save_scratchpad_contents();
return ret;
err3:
list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) {
list_del(&pwrst->node);
kfree(pwrst);
}
free_irq(omap_prcm_event_to_irq("io"), omap3_pm_init);
err2:
free_irq(omap_prcm_event_to_irq("wkup"), NULL);
err1:
return ret;
}