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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/arm/mach-omap1/pm.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/mach-omap1/pm.c')
-rw-r--r--arch/arm/mach-omap1/pm.c644
1 files changed, 644 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/pm.c b/arch/arm/mach-omap1/pm.c
new file mode 100644
index 0000000000..6a5815aa05
--- /dev/null
+++ b/arch/arm/mach-omap1/pm.c
@@ -0,0 +1,644 @@
+/*
+ * 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 <linux/soc/ti/omap1-io.h>
+#include "tc.h"
+#include <linux/omap-dma.h>
+#include <clocksource/timer-ti-dm.h>
+
+#include "hardware.h"
+#include "mux.h"
+#include "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 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_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_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_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 */
+ 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_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_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_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_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_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_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)
+ pr_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);