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609 lines
16 KiB
609 lines
16 KiB
/*
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* linux/arch/arm/plat-omap/pm.c
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*
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* OMAP Power Management Routines
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*
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* Original code for the SA11x0:
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* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
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*
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* Modified for the PXA250 by Nicolas Pitre:
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* Copyright (c) 2002 Monta Vista Software, Inc.
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*
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* Modified for the OMAP1510 by David Singleton:
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* Copyright (c) 2002 Monta Vista Software, Inc.
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*
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* Cleanup 2004 for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/pm.h>
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#include <linux/sched.h>
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#include <linux/proc_fs.h>
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#include <linux/pm.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/mach/time.h>
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#include <asm/mach/irq.h>
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#include <asm/mach-types.h>
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#include <asm/arch/irqs.h>
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#include <asm/arch/tc.h>
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#include <asm/arch/pm.h>
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#include <asm/arch/mux.h>
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#include <asm/arch/tps65010.h>
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#include <asm/arch/dsp_common.h>
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#include "clock.h"
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#include "sram.h"
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static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE];
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static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE];
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static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
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static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
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static void (*omap_sram_idle)(void) = NULL;
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static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
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/*
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* Let's power down on idle, but only if we are really
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* idle, because once we start down the path of
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* going idle we continue to do idle even if we get
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* a clock tick interrupt . .
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*/
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void omap_pm_idle(void)
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{
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unsigned int mask32 = 0;
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/*
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* If the DSP is being used let's just idle the CPU, the overhead
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* to wake up from Big Sleep is big, milliseconds versus micro
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* seconds for wait for interrupt.
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*/
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local_irq_disable();
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local_fiq_disable();
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if (need_resched()) {
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local_fiq_enable();
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local_irq_enable();
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return;
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}
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mask32 = omap_readl(ARM_SYSST);
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/*
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* Prevent the ULPD from entering low power state by setting
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* POWER_CTRL_REG:4 = 0
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*/
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omap_writew(omap_readw(ULPD_POWER_CTRL) &
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~ULPD_DEEP_SLEEP_TRANSITION_EN, ULPD_POWER_CTRL);
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/*
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* Since an interrupt may set up a timer, we don't want to
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* reprogram the hardware timer with interrupts enabled.
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* Re-enable interrupts only after returning from idle.
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*/
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timer_dyn_reprogram();
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if ((mask32 & DSP_IDLE) == 0) {
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__asm__ volatile ("mcr p15, 0, r0, c7, c0, 4");
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} else
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omap_sram_idle();
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local_fiq_enable();
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local_irq_enable();
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}
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/*
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* Configuration of the wakeup event is board specific. For the
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* moment we put it into this helper function. Later it may move
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* to board specific files.
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*/
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static void omap_pm_wakeup_setup(void)
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{
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u32 level1_wake = OMAP_IRQ_BIT(INT_IH2_IRQ);
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u32 level2_wake = OMAP_IRQ_BIT(INT_UART2) | OMAP_IRQ_BIT(INT_KEYBOARD);
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/*
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* Turn off all interrupts except GPIO bank 1, L1-2nd level cascade,
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* and the L2 wakeup interrupts: keypad and UART2. Note that the
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* drivers must still separately call omap_set_gpio_wakeup() to
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* wake up to a GPIO interrupt.
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*/
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if (cpu_is_omap1510() || cpu_is_omap16xx())
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level1_wake |= OMAP_IRQ_BIT(INT_GPIO_BANK1);
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else if (cpu_is_omap730())
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level1_wake |= OMAP_IRQ_BIT(INT_730_GPIO_BANK1);
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omap_writel(~level1_wake, OMAP_IH1_MIR);
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if (cpu_is_omap1510())
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omap_writel(~level2_wake, OMAP_IH2_MIR);
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/* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
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if (cpu_is_omap16xx()) {
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omap_writel(~level2_wake, OMAP_IH2_0_MIR);
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omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ), OMAP_IH2_1_MIR);
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omap_writel(~0x0, OMAP_IH2_2_MIR);
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omap_writel(~0x0, OMAP_IH2_3_MIR);
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}
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/* New IRQ agreement, recalculate in cascade order */
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omap_writel(1, OMAP_IH2_CONTROL);
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omap_writel(1, OMAP_IH1_CONTROL);
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}
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void omap_pm_suspend(void)
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{
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unsigned long arg0 = 0, arg1 = 0;
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printk("PM: OMAP%x is trying to enter deep sleep...\n", system_rev);
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omap_serial_wake_trigger(1);
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if (machine_is_omap_osk()) {
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/* Stop LED1 (D9) blink */
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tps65010_set_led(LED1, OFF);
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}
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omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG);
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/*
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* Step 1: turn off interrupts (FIXME: NOTE: already disabled)
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*/
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local_irq_disable();
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local_fiq_disable();
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/*
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* Step 2: save registers
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*
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* The omap is a strange/beautiful device. The caches, memory
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* and register state are preserved across power saves.
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* We have to save and restore very little register state to
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* idle the omap.
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*
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* Save interrupt, MPUI, ARM and UPLD control registers.
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*/
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if (cpu_is_omap1510()) {
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MPUI1510_SAVE(OMAP_IH1_MIR);
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MPUI1510_SAVE(OMAP_IH2_MIR);
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MPUI1510_SAVE(MPUI_CTRL);
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MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
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MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
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MPUI1510_SAVE(EMIFS_CONFIG);
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MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
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} else if (cpu_is_omap16xx()) {
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MPUI1610_SAVE(OMAP_IH1_MIR);
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MPUI1610_SAVE(OMAP_IH2_0_MIR);
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MPUI1610_SAVE(OMAP_IH2_1_MIR);
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MPUI1610_SAVE(OMAP_IH2_2_MIR);
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MPUI1610_SAVE(OMAP_IH2_3_MIR);
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MPUI1610_SAVE(MPUI_CTRL);
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MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
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MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
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MPUI1610_SAVE(EMIFS_CONFIG);
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MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
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}
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ARM_SAVE(ARM_CKCTL);
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ARM_SAVE(ARM_IDLECT1);
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ARM_SAVE(ARM_IDLECT2);
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if (!(cpu_is_omap1510()))
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ARM_SAVE(ARM_IDLECT3);
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ARM_SAVE(ARM_EWUPCT);
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ARM_SAVE(ARM_RSTCT1);
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ARM_SAVE(ARM_RSTCT2);
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ARM_SAVE(ARM_SYSST);
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ULPD_SAVE(ULPD_CLOCK_CTRL);
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ULPD_SAVE(ULPD_STATUS_REQ);
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/* (Step 3 removed - we now allow deep sleep by default) */
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/*
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* Step 4: OMAP DSP Shutdown
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*/
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/*
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* Step 5: Wakeup Event Setup
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*/
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omap_pm_wakeup_setup();
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/*
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* Step 6: ARM and Traffic controller shutdown
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*/
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/* disable ARM watchdog */
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omap_writel(0x00F5, OMAP_WDT_TIMER_MODE);
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omap_writel(0x00A0, OMAP_WDT_TIMER_MODE);
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/*
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* Step 6b: ARM and Traffic controller shutdown
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*
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* Step 6 continues here. Prepare jump to power management
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* assembly code in internal SRAM.
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*
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* Since the omap_cpu_suspend routine has been copied to
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* SRAM, we'll do an indirect procedure call to it and pass the
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* contents of arm_idlect1 and arm_idlect2 so it can restore
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* them when it wakes up and it will return.
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*/
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arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
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arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
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/*
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* Step 6c: ARM and Traffic controller shutdown
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*
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* Jump to assembly code. The processor will stay there
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* until wake up.
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*/
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omap_sram_suspend(arg0, arg1);
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/*
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* If we are here, processor is woken up!
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*/
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/*
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* Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
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*/
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if (!(cpu_is_omap1510()))
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ARM_RESTORE(ARM_IDLECT3);
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ARM_RESTORE(ARM_CKCTL);
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ARM_RESTORE(ARM_EWUPCT);
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ARM_RESTORE(ARM_RSTCT1);
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ARM_RESTORE(ARM_RSTCT2);
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ARM_RESTORE(ARM_SYSST);
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ULPD_RESTORE(ULPD_CLOCK_CTRL);
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ULPD_RESTORE(ULPD_STATUS_REQ);
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if (cpu_is_omap1510()) {
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MPUI1510_RESTORE(MPUI_CTRL);
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MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
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MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
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MPUI1510_RESTORE(EMIFS_CONFIG);
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MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
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MPUI1510_RESTORE(OMAP_IH1_MIR);
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MPUI1510_RESTORE(OMAP_IH2_MIR);
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} else if (cpu_is_omap16xx()) {
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MPUI1610_RESTORE(MPUI_CTRL);
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MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
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MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
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MPUI1610_RESTORE(EMIFS_CONFIG);
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MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
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MPUI1610_RESTORE(OMAP_IH1_MIR);
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MPUI1610_RESTORE(OMAP_IH2_0_MIR);
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MPUI1610_RESTORE(OMAP_IH2_1_MIR);
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MPUI1610_RESTORE(OMAP_IH2_2_MIR);
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MPUI1610_RESTORE(OMAP_IH2_3_MIR);
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}
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omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
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/*
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* Reenable interrupts
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*/
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local_irq_enable();
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local_fiq_enable();
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omap_serial_wake_trigger(0);
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printk("PM: OMAP%x is re-starting from deep sleep...\n", system_rev);
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if (machine_is_omap_osk()) {
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/* Let LED1 (D9) blink again */
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tps65010_set_led(LED1, BLINK);
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}
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}
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#if defined(DEBUG) && defined(CONFIG_PROC_FS)
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static int g_read_completed;
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/*
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* Read system PM registers for debugging
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*/
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static int omap_pm_read_proc(
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char *page_buffer,
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char **my_first_byte,
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off_t virtual_start,
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int length,
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int *eof,
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void *data)
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{
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int my_buffer_offset = 0;
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char * const my_base = page_buffer;
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ARM_SAVE(ARM_CKCTL);
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ARM_SAVE(ARM_IDLECT1);
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ARM_SAVE(ARM_IDLECT2);
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if (!(cpu_is_omap1510()))
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ARM_SAVE(ARM_IDLECT3);
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ARM_SAVE(ARM_EWUPCT);
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ARM_SAVE(ARM_RSTCT1);
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ARM_SAVE(ARM_RSTCT2);
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ARM_SAVE(ARM_SYSST);
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ULPD_SAVE(ULPD_IT_STATUS);
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ULPD_SAVE(ULPD_CLOCK_CTRL);
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ULPD_SAVE(ULPD_SOFT_REQ);
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ULPD_SAVE(ULPD_STATUS_REQ);
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ULPD_SAVE(ULPD_DPLL_CTRL);
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ULPD_SAVE(ULPD_POWER_CTRL);
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if (cpu_is_omap1510()) {
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MPUI1510_SAVE(MPUI_CTRL);
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MPUI1510_SAVE(MPUI_DSP_STATUS);
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MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
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MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
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MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
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MPUI1510_SAVE(EMIFS_CONFIG);
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} else if (cpu_is_omap16xx()) {
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MPUI1610_SAVE(MPUI_CTRL);
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MPUI1610_SAVE(MPUI_DSP_STATUS);
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MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
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MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
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MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
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MPUI1610_SAVE(EMIFS_CONFIG);
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}
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if (virtual_start == 0) {
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g_read_completed = 0;
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my_buffer_offset += sprintf(my_base + my_buffer_offset,
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"ARM_CKCTL_REG: 0x%-8x \n"
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"ARM_IDLECT1_REG: 0x%-8x \n"
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"ARM_IDLECT2_REG: 0x%-8x \n"
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"ARM_IDLECT3_REG: 0x%-8x \n"
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"ARM_EWUPCT_REG: 0x%-8x \n"
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"ARM_RSTCT1_REG: 0x%-8x \n"
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"ARM_RSTCT2_REG: 0x%-8x \n"
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"ARM_SYSST_REG: 0x%-8x \n"
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"ULPD_IT_STATUS_REG: 0x%-4x \n"
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"ULPD_CLOCK_CTRL_REG: 0x%-4x \n"
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"ULPD_SOFT_REQ_REG: 0x%-4x \n"
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"ULPD_DPLL_CTRL_REG: 0x%-4x \n"
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"ULPD_STATUS_REQ_REG: 0x%-4x \n"
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"ULPD_POWER_CTRL_REG: 0x%-4x \n",
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ARM_SHOW(ARM_CKCTL),
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ARM_SHOW(ARM_IDLECT1),
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ARM_SHOW(ARM_IDLECT2),
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ARM_SHOW(ARM_IDLECT3),
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ARM_SHOW(ARM_EWUPCT),
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ARM_SHOW(ARM_RSTCT1),
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ARM_SHOW(ARM_RSTCT2),
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ARM_SHOW(ARM_SYSST),
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ULPD_SHOW(ULPD_IT_STATUS),
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ULPD_SHOW(ULPD_CLOCK_CTRL),
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ULPD_SHOW(ULPD_SOFT_REQ),
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ULPD_SHOW(ULPD_DPLL_CTRL),
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ULPD_SHOW(ULPD_STATUS_REQ),
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ULPD_SHOW(ULPD_POWER_CTRL));
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if (cpu_is_omap1510()) {
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my_buffer_offset += sprintf(my_base + my_buffer_offset,
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"MPUI1510_CTRL_REG 0x%-8x \n"
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"MPUI1510_DSP_STATUS_REG: 0x%-8x \n"
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"MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
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"MPUI1510_DSP_API_CONFIG_REG: 0x%-8x \n"
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"MPUI1510_SDRAM_CONFIG_REG: 0x%-8x \n"
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"MPUI1510_EMIFS_CONFIG_REG: 0x%-8x \n",
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MPUI1510_SHOW(MPUI_CTRL),
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MPUI1510_SHOW(MPUI_DSP_STATUS),
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MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
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MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
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MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
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MPUI1510_SHOW(EMIFS_CONFIG));
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} else if (cpu_is_omap16xx()) {
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my_buffer_offset += sprintf(my_base + my_buffer_offset,
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"MPUI1610_CTRL_REG 0x%-8x \n"
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"MPUI1610_DSP_STATUS_REG: 0x%-8x \n"
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"MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
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"MPUI1610_DSP_API_CONFIG_REG: 0x%-8x \n"
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"MPUI1610_SDRAM_CONFIG_REG: 0x%-8x \n"
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"MPUI1610_EMIFS_CONFIG_REG: 0x%-8x \n",
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MPUI1610_SHOW(MPUI_CTRL),
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MPUI1610_SHOW(MPUI_DSP_STATUS),
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MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
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MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
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MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
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MPUI1610_SHOW(EMIFS_CONFIG));
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}
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g_read_completed++;
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} else if (g_read_completed >= 1) {
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*eof = 1;
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return 0;
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}
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g_read_completed++;
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*my_first_byte = page_buffer;
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return my_buffer_offset;
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}
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static void omap_pm_init_proc(void)
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{
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struct proc_dir_entry *entry;
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entry = create_proc_read_entry("driver/omap_pm",
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S_IWUSR | S_IRUGO, NULL,
|
|
omap_pm_read_proc, NULL);
|
|
}
|
|
|
|
#endif /* DEBUG && CONFIG_PROC_FS */
|
|
|
|
/*
|
|
* omap_pm_prepare - Do preliminary suspend work.
|
|
* @state: suspend state we're entering.
|
|
*
|
|
*/
|
|
//#include <asm/arch/hardware.h>
|
|
|
|
static int omap_pm_prepare(suspend_state_t state)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (state)
|
|
{
|
|
case PM_SUSPEND_STANDBY:
|
|
case PM_SUSPEND_MEM:
|
|
break;
|
|
|
|
case PM_SUSPEND_DISK:
|
|
return -ENOTSUPP;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/*
|
|
* omap_pm_enter - Actually enter a sleep state.
|
|
* @state: State we're entering.
|
|
*
|
|
*/
|
|
|
|
static int omap_pm_enter(suspend_state_t state)
|
|
{
|
|
switch (state)
|
|
{
|
|
case PM_SUSPEND_STANDBY:
|
|
case PM_SUSPEND_MEM:
|
|
omap_pm_suspend();
|
|
break;
|
|
|
|
case PM_SUSPEND_DISK:
|
|
return -ENOTSUPP;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* omap_pm_finish - Finish up suspend sequence.
|
|
* @state: State we're coming out of.
|
|
*
|
|
* This is called after we wake back up (or if entering the sleep state
|
|
* failed).
|
|
*/
|
|
|
|
static int omap_pm_finish(suspend_state_t state)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
static irqreturn_t omap_wakeup_interrupt(int irq, void * dev,
|
|
struct pt_regs * regs)
|
|
{
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction omap_wakeup_irq = {
|
|
.name = "peripheral wakeup",
|
|
.flags = SA_INTERRUPT,
|
|
.handler = omap_wakeup_interrupt
|
|
};
|
|
|
|
|
|
|
|
static struct pm_ops omap_pm_ops ={
|
|
.pm_disk_mode = 0,
|
|
.prepare = omap_pm_prepare,
|
|
.enter = omap_pm_enter,
|
|
.finish = omap_pm_finish,
|
|
};
|
|
|
|
static int __init omap_pm_init(void)
|
|
{
|
|
printk("Power Management for TI OMAP.\n");
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (cpu_is_omap1510()) {
|
|
omap_sram_idle = omap_sram_push(omap1510_idle_loop_suspend,
|
|
omap1510_idle_loop_suspend_sz);
|
|
omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
|
|
omap1510_cpu_suspend_sz);
|
|
} else if (cpu_is_omap16xx()) {
|
|
omap_sram_idle = omap_sram_push(omap1610_idle_loop_suspend,
|
|
omap1610_idle_loop_suspend_sz);
|
|
omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
|
|
omap1610_cpu_suspend_sz);
|
|
}
|
|
|
|
if (omap_sram_idle == NULL || omap_sram_suspend == NULL) {
|
|
printk(KERN_ERR "PM not initialized: Missing SRAM support\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
pm_idle = omap_pm_idle;
|
|
|
|
setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
|
|
#if 0
|
|
/* --- BEGIN BOARD-DEPENDENT CODE --- */
|
|
/* Sleepx mask direction */
|
|
omap_writew((omap_readw(0xfffb5008) & ~2), 0xfffb5008);
|
|
/* Unmask sleepx signal */
|
|
omap_writew((omap_readw(0xfffb5004) & ~2), 0xfffb5004);
|
|
/* --- END BOARD-DEPENDENT CODE --- */
|
|
#endif
|
|
|
|
/* Program new power ramp-up time
|
|
* (0 for most boards since we don't lower voltage when in deep sleep)
|
|
*/
|
|
omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
|
|
|
|
/* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
|
|
omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
|
|
|
|
/* Configure IDLECT3 */
|
|
if (cpu_is_omap16xx())
|
|
omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
|
|
|
|
pm_set_ops(&omap_pm_ops);
|
|
|
|
#if defined(DEBUG) && defined(CONFIG_PROC_FS)
|
|
omap_pm_init_proc();
|
|
#endif
|
|
|
|
/* configure LOW_PWR pin */
|
|
omap_cfg_reg(T20_1610_LOW_PWR);
|
|
|
|
return 0;
|
|
}
|
|
__initcall(omap_pm_init);
|
|
|
|
|