diff options
Diffstat (limited to 'arch/arm/mach-omap1/pm.c')
| -rw-r--r-- | arch/arm/mach-omap1/pm.c | 697 |
1 files changed, 697 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/pm.c b/arch/arm/mach-omap1/pm.c new file mode 100644 index 000000000..a745d64d4 --- /dev/null +++ b/arch/arm/mach-omap1/pm.c @@ -0,0 +1,697 @@ +/* + * linux/arch/arm/mach-omap1/pm.c + * + * OMAP Power Management Routines + * + * Original code for the SA11x0: + * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com> + * + * Modified for the PXA250 by Nicolas Pitre: + * Copyright (c) 2002 Monta Vista Software, Inc. + * + * Modified for the OMAP1510 by David Singleton: + * Copyright (c) 2002 Monta Vista Software, Inc. + * + * Cleanup 2004 for OMAP1510/1610 by Dirk Behme <dirk.behme@de.bosch.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/suspend.h> +#include <linux/sched.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/interrupt.h> +#include <linux/sysfs.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/atomic.h> +#include <linux/cpu.h> + +#include <asm/fncpy.h> +#include <asm/system_misc.h> +#include <asm/irq.h> +#include <asm/mach/time.h> +#include <asm/mach/irq.h> + +#include <mach/tc.h> +#include <mach/mux.h> +#include <linux/omap-dma.h> +#include <clocksource/timer-ti-dm.h> + +#include <mach/irqs.h> + +#include "iomap.h" +#include "clock.h" +#include "pm.h" +#include "soc.h" +#include "sram.h" + +static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE]; +static unsigned short dsp_sleep_save[DSP_SLEEP_SAVE_SIZE]; +static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE]; +static unsigned int mpui7xx_sleep_save[MPUI7XX_SLEEP_SAVE_SIZE]; +static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE]; +static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE]; + +static unsigned short enable_dyn_sleep; + +static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%hu\n", enable_dyn_sleep); +} + +static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr, + const char * buf, size_t n) +{ + unsigned short value; + if (sscanf(buf, "%hu", &value) != 1 || + (value != 0 && value != 1) || + (value != 0 && !IS_ENABLED(CONFIG_OMAP_32K_TIMER))) { + pr_err("idle_sleep_store: Invalid value\n"); + return -EINVAL; + } + enable_dyn_sleep = value; + return n; +} + +static struct kobj_attribute sleep_while_idle_attr = + __ATTR(sleep_while_idle, 0644, idle_show, idle_store); + + +static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL; + +/* + * Let's power down on idle, but only if we are really + * idle, because once we start down the path of + * going idle we continue to do idle even if we get + * a clock tick interrupt . . + */ +void omap1_pm_idle(void) +{ + extern __u32 arm_idlect1_mask; + __u32 use_idlect1 = arm_idlect1_mask; + + local_fiq_disable(); + +#if defined(CONFIG_OMAP_MPU_TIMER) && !defined(CONFIG_OMAP_DM_TIMER) + use_idlect1 = use_idlect1 & ~(1 << 9); +#endif + +#ifdef CONFIG_OMAP_DM_TIMER + use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1); +#endif + + if (omap_dma_running()) + use_idlect1 &= ~(1 << 6); + + /* + * We should be able to remove the do_sleep variable and multiple + * tests above as soon as drivers, timer and DMA code have been fixed. + * Even the sleep block count should become obsolete. + */ + if ((use_idlect1 != ~0) || !enable_dyn_sleep) { + + __u32 saved_idlect1 = omap_readl(ARM_IDLECT1); + if (cpu_is_omap15xx()) + use_idlect1 &= OMAP1510_BIG_SLEEP_REQUEST; + else + use_idlect1 &= OMAP1610_IDLECT1_SLEEP_VAL; + omap_writel(use_idlect1, ARM_IDLECT1); + __asm__ volatile ("mcr p15, 0, r0, c7, c0, 4"); + omap_writel(saved_idlect1, ARM_IDLECT1); + + local_fiq_enable(); + return; + } + omap_sram_suspend(omap_readl(ARM_IDLECT1), + omap_readl(ARM_IDLECT2)); + + local_fiq_enable(); +} + +/* + * Configuration of the wakeup event is board specific. For the + * moment we put it into this helper function. Later it may move + * to board specific files. + */ +static void omap_pm_wakeup_setup(void) +{ + u32 level1_wake = 0; + u32 level2_wake = OMAP_IRQ_BIT(INT_UART2); + + /* + * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade, + * and the L2 wakeup interrupts: keypad and UART2. Note that the + * drivers must still separately call omap_set_gpio_wakeup() to + * wake up to a GPIO interrupt. + */ + if (cpu_is_omap7xx()) + level1_wake = OMAP_IRQ_BIT(INT_7XX_GPIO_BANK1) | + OMAP_IRQ_BIT(INT_7XX_IH2_IRQ); + else if (cpu_is_omap15xx()) + level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) | + OMAP_IRQ_BIT(INT_1510_IH2_IRQ); + else if (cpu_is_omap16xx()) + level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) | + OMAP_IRQ_BIT(INT_1610_IH2_IRQ); + + omap_writel(~level1_wake, OMAP_IH1_MIR); + + if (cpu_is_omap7xx()) { + omap_writel(~level2_wake, OMAP_IH2_0_MIR); + omap_writel(~(OMAP_IRQ_BIT(INT_7XX_WAKE_UP_REQ) | + OMAP_IRQ_BIT(INT_7XX_MPUIO_KEYPAD)), + OMAP_IH2_1_MIR); + } else if (cpu_is_omap15xx()) { + level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD); + omap_writel(~level2_wake, OMAP_IH2_MIR); + } else if (cpu_is_omap16xx()) { + level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD); + omap_writel(~level2_wake, OMAP_IH2_0_MIR); + + /* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */ + omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ), + OMAP_IH2_1_MIR); + omap_writel(~0x0, OMAP_IH2_2_MIR); + omap_writel(~0x0, OMAP_IH2_3_MIR); + } + + /* New IRQ agreement, recalculate in cascade order */ + omap_writel(1, OMAP_IH2_CONTROL); + omap_writel(1, OMAP_IH1_CONTROL); +} + +#define EN_DSPCK 13 /* ARM_CKCTL */ +#define EN_APICK 6 /* ARM_IDLECT2 */ +#define DSP_EN 1 /* ARM_RSTCT1 */ + +void omap1_pm_suspend(void) +{ + unsigned long arg0 = 0, arg1 = 0; + + printk(KERN_INFO "PM: OMAP%x is trying to enter deep sleep...\n", + omap_rev()); + + omap_serial_wake_trigger(1); + + if (!cpu_is_omap15xx()) + omap_writew(0xffff, ULPD_SOFT_DISABLE_REQ_REG); + + /* + * Step 1: turn off interrupts (FIXME: NOTE: already disabled) + */ + + local_irq_disable(); + local_fiq_disable(); + + /* + * Step 2: save registers + * + * The omap is a strange/beautiful device. The caches, memory + * and register state are preserved across power saves. + * We have to save and restore very little register state to + * idle the omap. + * + * Save interrupt, MPUI, ARM and UPLD control registers. + */ + + if (cpu_is_omap7xx()) { + MPUI7XX_SAVE(OMAP_IH1_MIR); + MPUI7XX_SAVE(OMAP_IH2_0_MIR); + MPUI7XX_SAVE(OMAP_IH2_1_MIR); + MPUI7XX_SAVE(MPUI_CTRL); + MPUI7XX_SAVE(MPUI_DSP_BOOT_CONFIG); + MPUI7XX_SAVE(MPUI_DSP_API_CONFIG); + MPUI7XX_SAVE(EMIFS_CONFIG); + MPUI7XX_SAVE(EMIFF_SDRAM_CONFIG); + + } else if (cpu_is_omap15xx()) { + MPUI1510_SAVE(OMAP_IH1_MIR); + MPUI1510_SAVE(OMAP_IH2_MIR); + MPUI1510_SAVE(MPUI_CTRL); + MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG); + MPUI1510_SAVE(MPUI_DSP_API_CONFIG); + MPUI1510_SAVE(EMIFS_CONFIG); + MPUI1510_SAVE(EMIFF_SDRAM_CONFIG); + } else if (cpu_is_omap16xx()) { + MPUI1610_SAVE(OMAP_IH1_MIR); + MPUI1610_SAVE(OMAP_IH2_0_MIR); + MPUI1610_SAVE(OMAP_IH2_1_MIR); + MPUI1610_SAVE(OMAP_IH2_2_MIR); + MPUI1610_SAVE(OMAP_IH2_3_MIR); + MPUI1610_SAVE(MPUI_CTRL); + MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG); + MPUI1610_SAVE(MPUI_DSP_API_CONFIG); + MPUI1610_SAVE(EMIFS_CONFIG); + MPUI1610_SAVE(EMIFF_SDRAM_CONFIG); + } + + ARM_SAVE(ARM_CKCTL); + ARM_SAVE(ARM_IDLECT1); + ARM_SAVE(ARM_IDLECT2); + if (!(cpu_is_omap15xx())) + ARM_SAVE(ARM_IDLECT3); + ARM_SAVE(ARM_EWUPCT); + ARM_SAVE(ARM_RSTCT1); + ARM_SAVE(ARM_RSTCT2); + ARM_SAVE(ARM_SYSST); + ULPD_SAVE(ULPD_CLOCK_CTRL); + ULPD_SAVE(ULPD_STATUS_REQ); + + /* (Step 3 removed - we now allow deep sleep by default) */ + + /* + * Step 4: OMAP DSP Shutdown + */ + + /* stop DSP */ + omap_writew(omap_readw(ARM_RSTCT1) & ~(1 << DSP_EN), ARM_RSTCT1); + + /* shut down dsp_ck */ + if (!cpu_is_omap7xx()) + omap_writew(omap_readw(ARM_CKCTL) & ~(1 << EN_DSPCK), ARM_CKCTL); + + /* temporarily enabling api_ck to access DSP registers */ + omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2); + + /* save DSP registers */ + DSP_SAVE(DSP_IDLECT2); + + /* Stop all DSP domain clocks */ + __raw_writew(0, DSP_IDLECT2); + + /* + * Step 5: Wakeup Event Setup + */ + + omap_pm_wakeup_setup(); + + /* + * Step 6: ARM and Traffic controller shutdown + */ + + /* disable ARM watchdog */ + omap_writel(0x00F5, OMAP_WDT_TIMER_MODE); + omap_writel(0x00A0, OMAP_WDT_TIMER_MODE); + + /* + * Step 6b: ARM and Traffic controller shutdown + * + * Step 6 continues here. Prepare jump to power management + * assembly code in internal SRAM. + * + * Since the omap_cpu_suspend routine has been copied to + * SRAM, we'll do an indirect procedure call to it and pass the + * contents of arm_idlect1 and arm_idlect2 so it can restore + * them when it wakes up and it will return. + */ + + arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1]; + arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2]; + + /* + * Step 6c: ARM and Traffic controller shutdown + * + * Jump to assembly code. The processor will stay there + * until wake up. + */ + omap_sram_suspend(arg0, arg1); + + /* + * If we are here, processor is woken up! + */ + + /* + * Restore DSP clocks + */ + + /* again temporarily enabling api_ck to access DSP registers */ + omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2); + + /* Restore DSP domain clocks */ + DSP_RESTORE(DSP_IDLECT2); + + /* + * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did + */ + + if (!(cpu_is_omap15xx())) + ARM_RESTORE(ARM_IDLECT3); + ARM_RESTORE(ARM_CKCTL); + ARM_RESTORE(ARM_EWUPCT); + ARM_RESTORE(ARM_RSTCT1); + ARM_RESTORE(ARM_RSTCT2); + ARM_RESTORE(ARM_SYSST); + ULPD_RESTORE(ULPD_CLOCK_CTRL); + ULPD_RESTORE(ULPD_STATUS_REQ); + + if (cpu_is_omap7xx()) { + MPUI7XX_RESTORE(EMIFS_CONFIG); + MPUI7XX_RESTORE(EMIFF_SDRAM_CONFIG); + MPUI7XX_RESTORE(OMAP_IH1_MIR); + MPUI7XX_RESTORE(OMAP_IH2_0_MIR); + MPUI7XX_RESTORE(OMAP_IH2_1_MIR); + } else if (cpu_is_omap15xx()) { + MPUI1510_RESTORE(MPUI_CTRL); + MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG); + MPUI1510_RESTORE(MPUI_DSP_API_CONFIG); + MPUI1510_RESTORE(EMIFS_CONFIG); + MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG); + MPUI1510_RESTORE(OMAP_IH1_MIR); + MPUI1510_RESTORE(OMAP_IH2_MIR); + } else if (cpu_is_omap16xx()) { + MPUI1610_RESTORE(MPUI_CTRL); + MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG); + MPUI1610_RESTORE(MPUI_DSP_API_CONFIG); + MPUI1610_RESTORE(EMIFS_CONFIG); + MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG); + + MPUI1610_RESTORE(OMAP_IH1_MIR); + MPUI1610_RESTORE(OMAP_IH2_0_MIR); + MPUI1610_RESTORE(OMAP_IH2_1_MIR); + MPUI1610_RESTORE(OMAP_IH2_2_MIR); + MPUI1610_RESTORE(OMAP_IH2_3_MIR); + } + + if (!cpu_is_omap15xx()) + omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG); + + /* + * Re-enable interrupts + */ + + local_irq_enable(); + local_fiq_enable(); + + omap_serial_wake_trigger(0); + + printk(KERN_INFO "PM: OMAP%x is re-starting from deep sleep...\n", + omap_rev()); +} + +#ifdef CONFIG_DEBUG_FS +/* + * Read system PM registers for debugging + */ +static int omap_pm_debug_show(struct seq_file *m, void *v) +{ + ARM_SAVE(ARM_CKCTL); + ARM_SAVE(ARM_IDLECT1); + ARM_SAVE(ARM_IDLECT2); + if (!(cpu_is_omap15xx())) + ARM_SAVE(ARM_IDLECT3); + ARM_SAVE(ARM_EWUPCT); + ARM_SAVE(ARM_RSTCT1); + ARM_SAVE(ARM_RSTCT2); + ARM_SAVE(ARM_SYSST); + + ULPD_SAVE(ULPD_IT_STATUS); + ULPD_SAVE(ULPD_CLOCK_CTRL); + ULPD_SAVE(ULPD_SOFT_REQ); + ULPD_SAVE(ULPD_STATUS_REQ); + ULPD_SAVE(ULPD_DPLL_CTRL); + ULPD_SAVE(ULPD_POWER_CTRL); + + if (cpu_is_omap7xx()) { + MPUI7XX_SAVE(MPUI_CTRL); + MPUI7XX_SAVE(MPUI_DSP_STATUS); + MPUI7XX_SAVE(MPUI_DSP_BOOT_CONFIG); + MPUI7XX_SAVE(MPUI_DSP_API_CONFIG); + MPUI7XX_SAVE(EMIFF_SDRAM_CONFIG); + MPUI7XX_SAVE(EMIFS_CONFIG); + } else if (cpu_is_omap15xx()) { + MPUI1510_SAVE(MPUI_CTRL); + MPUI1510_SAVE(MPUI_DSP_STATUS); + MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG); + MPUI1510_SAVE(MPUI_DSP_API_CONFIG); + MPUI1510_SAVE(EMIFF_SDRAM_CONFIG); + MPUI1510_SAVE(EMIFS_CONFIG); + } else if (cpu_is_omap16xx()) { + MPUI1610_SAVE(MPUI_CTRL); + MPUI1610_SAVE(MPUI_DSP_STATUS); + MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG); + MPUI1610_SAVE(MPUI_DSP_API_CONFIG); + MPUI1610_SAVE(EMIFF_SDRAM_CONFIG); + MPUI1610_SAVE(EMIFS_CONFIG); + } + + seq_printf(m, + "ARM_CKCTL_REG: 0x%-8x \n" + "ARM_IDLECT1_REG: 0x%-8x \n" + "ARM_IDLECT2_REG: 0x%-8x \n" + "ARM_IDLECT3_REG: 0x%-8x \n" + "ARM_EWUPCT_REG: 0x%-8x \n" + "ARM_RSTCT1_REG: 0x%-8x \n" + "ARM_RSTCT2_REG: 0x%-8x \n" + "ARM_SYSST_REG: 0x%-8x \n" + "ULPD_IT_STATUS_REG: 0x%-4x \n" + "ULPD_CLOCK_CTRL_REG: 0x%-4x \n" + "ULPD_SOFT_REQ_REG: 0x%-4x \n" + "ULPD_DPLL_CTRL_REG: 0x%-4x \n" + "ULPD_STATUS_REQ_REG: 0x%-4x \n" + "ULPD_POWER_CTRL_REG: 0x%-4x \n", + ARM_SHOW(ARM_CKCTL), + ARM_SHOW(ARM_IDLECT1), + ARM_SHOW(ARM_IDLECT2), + ARM_SHOW(ARM_IDLECT3), + ARM_SHOW(ARM_EWUPCT), + ARM_SHOW(ARM_RSTCT1), + ARM_SHOW(ARM_RSTCT2), + ARM_SHOW(ARM_SYSST), + ULPD_SHOW(ULPD_IT_STATUS), + ULPD_SHOW(ULPD_CLOCK_CTRL), + ULPD_SHOW(ULPD_SOFT_REQ), + ULPD_SHOW(ULPD_DPLL_CTRL), + ULPD_SHOW(ULPD_STATUS_REQ), + ULPD_SHOW(ULPD_POWER_CTRL)); + + if (cpu_is_omap7xx()) { + seq_printf(m, + "MPUI7XX_CTRL_REG 0x%-8x \n" + "MPUI7XX_DSP_STATUS_REG: 0x%-8x \n" + "MPUI7XX_DSP_BOOT_CONFIG_REG: 0x%-8x \n" + "MPUI7XX_DSP_API_CONFIG_REG: 0x%-8x \n" + "MPUI7XX_SDRAM_CONFIG_REG: 0x%-8x \n" + "MPUI7XX_EMIFS_CONFIG_REG: 0x%-8x \n", + MPUI7XX_SHOW(MPUI_CTRL), + MPUI7XX_SHOW(MPUI_DSP_STATUS), + MPUI7XX_SHOW(MPUI_DSP_BOOT_CONFIG), + MPUI7XX_SHOW(MPUI_DSP_API_CONFIG), + MPUI7XX_SHOW(EMIFF_SDRAM_CONFIG), + MPUI7XX_SHOW(EMIFS_CONFIG)); + } else if (cpu_is_omap15xx()) { + seq_printf(m, + "MPUI1510_CTRL_REG 0x%-8x \n" + "MPUI1510_DSP_STATUS_REG: 0x%-8x \n" + "MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n" + "MPUI1510_DSP_API_CONFIG_REG: 0x%-8x \n" + "MPUI1510_SDRAM_CONFIG_REG: 0x%-8x \n" + "MPUI1510_EMIFS_CONFIG_REG: 0x%-8x \n", + MPUI1510_SHOW(MPUI_CTRL), + MPUI1510_SHOW(MPUI_DSP_STATUS), + MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG), + MPUI1510_SHOW(MPUI_DSP_API_CONFIG), + MPUI1510_SHOW(EMIFF_SDRAM_CONFIG), + MPUI1510_SHOW(EMIFS_CONFIG)); + } else if (cpu_is_omap16xx()) { + seq_printf(m, + "MPUI1610_CTRL_REG 0x%-8x \n" + "MPUI1610_DSP_STATUS_REG: 0x%-8x \n" + "MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n" + "MPUI1610_DSP_API_CONFIG_REG: 0x%-8x \n" + "MPUI1610_SDRAM_CONFIG_REG: 0x%-8x \n" + "MPUI1610_EMIFS_CONFIG_REG: 0x%-8x \n", + MPUI1610_SHOW(MPUI_CTRL), + MPUI1610_SHOW(MPUI_DSP_STATUS), + MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG), + MPUI1610_SHOW(MPUI_DSP_API_CONFIG), + MPUI1610_SHOW(EMIFF_SDRAM_CONFIG), + MPUI1610_SHOW(EMIFS_CONFIG)); + } + + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(omap_pm_debug); + +static void omap_pm_init_debugfs(void) +{ + struct dentry *d; + + d = debugfs_create_dir("pm_debug", NULL); + debugfs_create_file("omap_pm", S_IWUSR | S_IRUGO, d, NULL, + &omap_pm_debug_fops); +} + +#endif /* CONFIG_DEBUG_FS */ + +/* + * omap_pm_prepare - Do preliminary suspend work. + * + */ +static int omap_pm_prepare(void) +{ + /* We cannot sleep in idle until we have resumed */ + cpu_idle_poll_ctrl(true); + return 0; +} + + +/* + * 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_MEM: + omap1_pm_suspend(); + break; + default: + return -EINVAL; + } + + return 0; +} + + +/** + * omap_pm_finish - Finish up suspend sequence. + * + * This is called after we wake back up (or if entering the sleep state + * failed). + */ + +static void omap_pm_finish(void) +{ + cpu_idle_poll_ctrl(false); +} + + +static irqreturn_t omap_wakeup_interrupt(int irq, void *dev) +{ + return IRQ_HANDLED; +} + + + +static const struct platform_suspend_ops omap_pm_ops = { + .prepare = omap_pm_prepare, + .enter = omap_pm_enter, + .finish = omap_pm_finish, + .valid = suspend_valid_only_mem, +}; + +static int __init omap_pm_init(void) +{ + int error = 0; + int irq; + + if (!cpu_class_is_omap1()) + return -ENODEV; + + pr_info("Power Management for TI OMAP.\n"); + + if (!IS_ENABLED(CONFIG_OMAP_32K_TIMER)) + pr_info("OMAP1 PM: sleep states in idle disabled due to no 32KiHz timer\n"); + + if (!IS_ENABLED(CONFIG_OMAP_DM_TIMER)) + pr_info("OMAP1 PM: sleep states in idle disabled due to no DMTIMER support\n"); + + if (IS_ENABLED(CONFIG_OMAP_32K_TIMER) && + IS_ENABLED(CONFIG_OMAP_DM_TIMER)) { + /* OMAP16xx only */ + pr_info("OMAP1 PM: sleep states in idle enabled\n"); + enable_dyn_sleep = 1; + } + + /* + * 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_omap7xx()) { + omap_sram_suspend = omap_sram_push(omap7xx_cpu_suspend, + omap7xx_cpu_suspend_sz); + } else if (cpu_is_omap15xx()) { + omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend, + omap1510_cpu_suspend_sz); + } else if (cpu_is_omap16xx()) { + omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend, + omap1610_cpu_suspend_sz); + } + + if (omap_sram_suspend == NULL) { + printk(KERN_ERR "PM not initialized: Missing SRAM support\n"); + return -ENODEV; + } + + arm_pm_idle = omap1_pm_idle; + + if (cpu_is_omap7xx()) + irq = INT_7XX_WAKE_UP_REQ; + else if (cpu_is_omap16xx()) + irq = INT_1610_WAKE_UP_REQ; + else + irq = -1; + + if (irq >= 0) { + if (request_irq(irq, omap_wakeup_interrupt, 0, "peripheral wakeup", NULL)) + pr_err("Failed to request irq %d (peripheral wakeup)\n", irq); + } + + /* 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_omap7xx()) + omap_writel(OMAP7XX_IDLECT3_VAL, OMAP7XX_IDLECT3); + else if (cpu_is_omap16xx()) + omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3); + + suspend_set_ops(&omap_pm_ops); + +#ifdef CONFIG_DEBUG_FS + omap_pm_init_debugfs(); +#endif + + error = sysfs_create_file(power_kobj, &sleep_while_idle_attr.attr); + if (error) + printk(KERN_ERR "sysfs_create_file failed: %d\n", error); + + if (cpu_is_omap16xx()) { + /* configure LOW_PWR pin */ + omap_cfg_reg(T20_1610_LOW_PWR); + } + + return error; +} +__initcall(omap_pm_init); |