[ARM] 3430/1: ARM: OMAP: 5/8 Update PM

Patch from Tony Lindgren

Update OMAP PM code from linux-omap tree:

- Move PM code from plat-omap to mach-omap1 and mach-omap2
by Tony Lindgren
- Add minimal PM support for omap24xx by Tony Lindgren and
Richard Woodruff
- Misc updates to omap1 PM code by Tuukka Tikkanen et al
- Updates to the SRAM code needed for PM and FB by Imre Deak

Signed-off-by: Tony Lindgren <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/mach-omap1/pm.c

···
+/*
+ * linux/arch/arm/mach-omap1/pm.c
+ *
+ * OMAP Power Management Routines
+ *
+ * Original code for the SA11x0:
+ * Copyright (c) 2001 Cliff Brake <[e-mail]>
+ *
+ * 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 <[e-mail]>
+ *
+ * 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/pm.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/pm.h>
+#include <linux/interrupt.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/atomic.h>
+#include <asm/mach/time.h>
+#include <asm/mach/irq.h>
+#include <asm/mach-types.h>
+
+#include <asm/arch/irqs.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/sram.h>
+#include <asm/arch/tc.h>
+#include <asm/arch/pm.h>
+#include <asm/arch/mux.h>
+#include <asm/arch/tps65010.h>
+#include <asm/arch/dma.h>
+#include <asm/arch/dsp_common.h>
+#include <asm/arch/dmtimer.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 mpui730_sleep_save[MPUI730_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 = 1;
+
+static ssize_t omap_pm_sleep_while_idle_show(struct subsystem * subsys, char *buf)
+{
+	return sprintf(buf, "%hu\n", enable_dyn_sleep);
+}
+
+static ssize_t omap_pm_sleep_while_idle_store(struct subsystem * subsys,
+					      const char * buf,
+					      size_t n)
+{
+	unsigned short value;
+	if (sscanf(buf, "%hu", &value) != 1 ||
+	    (value != 0 && value != 1)) {
+		printk(KERN_ERR "idle_sleep_store: Invalid value\n");
+		return -EINVAL;
+	}
+	enable_dyn_sleep = value;
+	return n;
+}
+
+static struct subsys_attribute sleep_while_idle_attr = {
+	.attr   = {
+		.name = __stringify(sleep_while_idle),
+		.mode = 0644,
+	},
+	.show   = omap_pm_sleep_while_idle_show,
+	.store  = omap_pm_sleep_while_idle_store,
+};
+
+extern struct subsystem power_subsys;
+static void (*omap_sram_idle)(void) = NULL;
+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 omap_pm_idle(void)
+{
+	extern __u32 arm_idlect1_mask;
+	__u32 use_idlect1 = arm_idlect1_mask;
+#ifndef CONFIG_OMAP_MPU_TIMER
+	int do_sleep;
+#endif
+
+	local_irq_disable();
+	local_fiq_disable();
+	if (need_resched()) {
+		local_fiq_enable();
+		local_irq_enable();
+		return;
+	}
+
+	/*
+	 * Since an interrupt may set up a timer, we don't want to
+	 * reprogram the hardware timer with interrupts enabled.
+	 * Re-enable interrupts only after returning from idle.
+	 */
+	timer_dyn_reprogram();
+
+#ifdef CONFIG_OMAP_MPU_TIMER
+#warning Enable 32kHz OS timer in order to allow sleep states in idle
+	use_idlect1 = use_idlect1 & ~(1 << 9);
+#else
+
+	do_sleep = 0;
+	while (enable_dyn_sleep) {
+
+#ifdef CONFIG_CBUS_TAHVO_USB
+		extern int vbus_active;
+		/* Clock requirements? */
+		if (vbus_active)
+			break;
+#endif
+		do_sleep = 1;
+		break;
+	}
+
+#ifdef CONFIG_OMAP_DM_TIMER
+	use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
+#endif
+
+	if (omap_dma_running()) {
+		use_idlect1 &= ~(1 << 6);
+		if (omap_lcd_dma_ext_running())
+			use_idlect1 &= ~(1 << 12);
+	}
+
+	/* 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) || !do_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();
+		local_irq_enable();
+		return;
+	}
+	omap_sram_suspend(omap_readl(ARM_IDLECT1),
+			  omap_readl(ARM_IDLECT2));
+#endif
+
+	local_fiq_enable();
+	local_irq_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_omap730())
+		level1_wake = OMAP_IRQ_BIT(INT_730_GPIO_BANK1) |
+			OMAP_IRQ_BIT(INT_730_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_omap730()) {
+		omap_writel(~level2_wake, OMAP_IH2_0_MIR);
+		omap_writel(~(OMAP_IRQ_BIT(INT_730_WAKE_UP_REQ) |
+				OMAP_IRQ_BIT(INT_730_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 omap_pm_suspend(void)
+{
+	unsigned long arg0 = 0, arg1 = 0;
+
+	printk("PM: OMAP%x is trying to enter deep sleep...\n", system_rev);
+
+	omap_serial_wake_trigger(1);
+
+	if (machine_is_omap_osk()) {
+		/* Stop LED1 (D9) blink */
+		tps65010_set_led(LED1, OFF);
+	}
+
+	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_omap730()) {
+		MPUI730_SAVE(OMAP_IH1_MIR);
+		MPUI730_SAVE(OMAP_IH2_0_MIR);
+		MPUI730_SAVE(OMAP_IH2_1_MIR);
+		MPUI730_SAVE(MPUI_CTRL);
+		MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
+		MPUI730_SAVE(MPUI_DSP_API_CONFIG);
+		MPUI730_SAVE(EMIFS_CONFIG);
+		MPUI730_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 */
+	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_omap730()) {
+		MPUI730_RESTORE(EMIFS_CONFIG);
+		MPUI730_RESTORE(EMIFF_SDRAM_CONFIG);
+		MPUI730_RESTORE(OMAP_IH1_MIR);
+		MPUI730_RESTORE(OMAP_IH2_0_MIR);
+		MPUI730_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);
+	}
+
+	omap_writew(0, ULPD_SOFT_DISABLE_REQ_REG);
+
+	/*
+	 * Reenable interrupts
+	 */
+
+	local_irq_enable();
+	local_fiq_enable();
+
+	omap_serial_wake_trigger(0);
+
+	printk("PM: OMAP%x is re-starting from deep sleep...\n", system_rev);
+
+	if (machine_is_omap_osk()) {
+		/* Let LED1 (D9) blink again */
+		tps65010_set_led(LED1, BLINK);
+	}
+}
+
+#if defined(DEBUG) && defined(CONFIG_PROC_FS)
+static int g_read_completed;
+
+/*
+ * Read system PM registers for debugging
+ */
+static int omap_pm_read_proc(
+	char *page_buffer,
+	char **my_first_byte,
+	off_t virtual_start,
+	int length,
+	int *eof,
+	void *data)
+{
+	int my_buffer_offset = 0;
+	char * const my_base = page_buffer;
+
+	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_omap730()) {
+		MPUI730_SAVE(MPUI_CTRL);
+		MPUI730_SAVE(MPUI_DSP_STATUS);
+		MPUI730_SAVE(MPUI_DSP_BOOT_CONFIG);
+		MPUI730_SAVE(MPUI_DSP_API_CONFIG);
+		MPUI730_SAVE(EMIFF_SDRAM_CONFIG);
+		MPUI730_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);
+	}
+
+	if (virtual_start == 0) {
+		g_read_completed = 0;
+
+		my_buffer_offset += sprintf(my_base + my_buffer_offset,
+		   "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_omap730()) {
+			my_buffer_offset += sprintf(my_base + my_buffer_offset,
+			   "MPUI730_CTRL_REG	     0x%-8x \n"
+			   "MPUI730_DSP_STATUS_REG:      0x%-8x \n"
+			   "MPUI730_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
+			   "MPUI730_DSP_API_CONFIG_REG:  0x%-8x \n"
+			   "MPUI730_SDRAM_CONFIG_REG:    0x%-8x \n"
+			   "MPUI730_EMIFS_CONFIG_REG:    0x%-8x \n",
+			   MPUI730_SHOW(MPUI_CTRL),
+			   MPUI730_SHOW(MPUI_DSP_STATUS),
+			   MPUI730_SHOW(MPUI_DSP_BOOT_CONFIG),
+			   MPUI730_SHOW(MPUI_DSP_API_CONFIG),
+			   MPUI730_SHOW(EMIFF_SDRAM_CONFIG),
+			   MPUI730_SHOW(EMIFS_CONFIG));
+		} else if (cpu_is_omap15xx()) {
+			my_buffer_offset += sprintf(my_base + my_buffer_offset,
+			   "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()) {
+			my_buffer_offset += sprintf(my_base + my_buffer_offset,
+			   "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));
+		}
+
+		g_read_completed++;
+	} else if (g_read_completed >= 1) {
+		 *eof = 1;
+		 return 0;
+	}
+	g_read_completed++;
+
+	*my_first_byte = page_buffer;
+	return  my_buffer_offset;
+}
+
+static void omap_pm_init_proc(void)
+{
+	struct proc_dir_entry *entry;
+
+	entry = create_proc_read_entry("driver/omap_pm",
+				       S_IWUSR | S_IRUGO, NULL,
+				       omap_pm_read_proc, NULL);
+}
+
+#endif /* DEBUG && CONFIG_PROC_FS */
+
+static void (*saved_idle)(void) = NULL;
+
+/*
+ *	omap_pm_prepare - Do preliminary suspend work.
+ *	@state:		suspend state we're entering.
+ *
+ */
+static int omap_pm_prepare(suspend_state_t state)
+{
+	int error = 0;
+
+	/* We cannot sleep in idle until we have resumed */
+	saved_idle = pm_idle;
+	pm_idle = NULL;
+
+	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)
+{
+	pm_idle = saved_idle;
+	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_omap730()) {
+		omap_sram_idle = omap_sram_push(omap730_idle_loop_suspend,
+						omap730_idle_loop_suspend_sz);
+		omap_sram_suspend = omap_sram_push(omap730_cpu_suspend,
+						   omap730_cpu_suspend_sz);
+	} else if (cpu_is_omap15xx()) {
+		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;
+
+	if (cpu_is_omap730())
+		setup_irq(INT_730_WAKE_UP_REQ, &omap_wakeup_irq);
+	else if (cpu_is_omap16xx())
+		setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_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_omap730())
+		omap_writel(OMAP730_IDLECT3_VAL, OMAP730_IDLECT3);
+	else 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
+
+	subsys_create_file(&power_subsys, &sleep_while_idle_attr);
+
+	if (cpu_is_omap16xx()) {
+		/* configure LOW_PWR pin */
+		omap_cfg_reg(T20_1610_LOW_PWR);
+	}
+
+	return 0;
+}
+__initcall(omap_pm_init);

arch/arm/mach-omap2/pm.c

···
+/*
+ * linux/arch/arm/mach-omap2/pm.c
+ *
+ * OMAP2 Power Management Routines
+ *
+ * Copyright (C) 2006 Nokia Corporation
+ * Tony Lindgren <[e-mail]>
+ *
+ * Copyright (C) 2005 Texas Instruments, Inc.
+ * Richard Woodruff <[e-mail]>
+ *
+ * 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/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/pm.h>
+#include <linux/interrupt.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/atomic.h>
+#include <asm/mach/time.h>
+#include <asm/mach/irq.h>
+#include <asm/mach-types.h>
+
+#include <asm/arch/irqs.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/sram.h>
+#include <asm/arch/pm.h>
+
+static struct clk *vclk;
+static void (*omap2_sram_idle)(void);
+static void (*omap2_sram_suspend)(int dllctrl, int cpu_rev);
+static void (*saved_idle)(void);
+
+void omap2_pm_idle(void)
+{
+	local_irq_disable();
+	local_fiq_disable();
+	if (need_resched()) {
+		local_fiq_enable();
+		local_irq_enable();
+		return;
+	}
+
+	/*
+	 * Since an interrupt may set up a timer, we don't want to
+	 * reprogram the hardware timer with interrupts enabled.
+	 * Re-enable interrupts only after returning from idle.
+	 */
+	timer_dyn_reprogram();
+
+	omap2_sram_idle();
+	local_fiq_enable();
+	local_irq_enable();
+}
+
+static int omap2_pm_prepare(suspend_state_t state)
+{
+	int error = 0;
+
+	/* We cannot sleep in idle until we have resumed */
+	saved_idle = pm_idle;
+	pm_idle = NULL;
+
+	switch (state)
+	{
+	case PM_SUSPEND_STANDBY:
+	case PM_SUSPEND_MEM:
+		break;
+
+	case PM_SUSPEND_DISK:
+		return -ENOTSUPP;
+
+	default:
+		return -EINVAL;
+	}
+
+	return error;
+}
+
+static int omap2_pm_enter(suspend_state_t state)
+{
+	switch (state)
+	{
+	case PM_SUSPEND_STANDBY:
+	case PM_SUSPEND_MEM:
+		/* FIXME: Add suspend */
+		break;
+
+	case PM_SUSPEND_DISK:
+		return -ENOTSUPP;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int omap2_pm_finish(suspend_state_t state)
+{
+	pm_idle = saved_idle;
+	return 0;
+}
+
+static struct pm_ops omap_pm_ops = {
+	.pm_disk_mode	= 0,
+	.prepare	= omap2_pm_prepare,
+	.enter		= omap2_pm_enter,
+	.finish		= omap2_pm_finish,
+};
+
+int __init omap2_pm_init(void)
+{
+	printk("Power Management for TI OMAP.\n");
+
+	vclk = clk_get(NULL, "virt_prcm_set");
+	if (IS_ERR(vclk)) {
+		printk(KERN_ERR "Could not get PM vclk\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * 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.
+	 */
+	omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend,
+					 omap24xx_idle_loop_suspend_sz);
+
+	omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
+					    omap24xx_cpu_suspend_sz);
+
+	pm_set_ops(&omap_pm_ops);
+	pm_idle = omap2_pm_idle;
+
+	return 0;
+}
+
+__initcall(omap2_pm_init);

arch/arm/mach-omap2/sleep.S

···
+/*
+ * linux/arch/arm/mach-omap2/sleep.S
+ *
+ * (C) Copyright 2004
+ * Texas Instruments, <www.ti.com>
+ * Richard Woodruff <[e-mail]>
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/arch/io.h>
+#include <asm/arch/pm.h>
+
+#define A_32KSYNC_CR_V		IO_ADDRESS(OMAP_TIMER32K_BASE+0x10)
+#define A_PRCM_VOLTCTRL_V	IO_ADDRESS(OMAP24XX_PRCM_BASE+0x50)
+#define A_PRCM_CLKCFG_CTRL_V	IO_ADDRESS(OMAP24XX_PRCM_BASE+0x80)
+#define A_CM_CLKEN_PLL_V	IO_ADDRESS(OMAP24XX_PRCM_BASE+0x500)
+#define A_CM_IDLEST_CKGEN_V	IO_ADDRESS(OMAP24XX_PRCM_BASE+0x520)
+#define A_CM_CLKSEL1_PLL_V	IO_ADDRESS(OMAP24XX_PRCM_BASE+0x540)
+#define A_CM_CLKSEL2_PLL_V	IO_ADDRESS(OMAP24XX_PRCM_BASE+0x544)
+
+#define A_SDRC_DLLA_CTRL_V	IO_ADDRESS(OMAP24XX_SDRC_BASE+0x60)
+#define	A_SDRC_POWER_V		IO_ADDRESS(OMAP24XX_SDRC_BASE+0x70)
+#define A_SDRC_RFR_CTRL_V	IO_ADDRESS(OMAP24XX_SDRC_BASE+0xA4)
+#define A_SDRC0_V		(0xC0000000)
+#define A_SDRC_MANUAL_V		IO_ADDRESS(OMAP24XX_SDRC_BASE+0xA8)
+
+	.text
+
+/*
+ * Forces OMAP into idle state
+ *
+ * omap24xx_idle_loop_suspend() - This bit of code just executes the WFI
+ * for normal idles.
+ *
+ * Note: This code get's copied to internal SRAM at boot. When the OMAP
+ *	 wakes up it continues execution at the point it went to sleep.
+ */
+ENTRY(omap24xx_idle_loop_suspend)
+	stmfd	sp!, {r0, lr}		@ save registers on stack
+	mov	r0, #0			@ clear for mcr setup
+	mcr	p15, 0, r0, c7, c0, 4	@ wait for interrupt
+	ldmfd	sp!, {r0, pc}		@ restore regs and return
+
+ENTRY(omap24xx_idle_loop_suspend_sz)
+	.word	. - omap24xx_idle_loop_suspend
+
+/*
+ * omap242x_cpu_suspend() - Forces OMAP into deep sleep state by completing
+ * SDRC shutdown then ARM shutdown.  Upon wake MPU is back on so just restore
+ * SDRC.
+ *
+ * Input:
+ * R0 :	DLL ctrl value pre-Sleep
+ * R1 : Processor+Revision
+ *	2420: 0x21 = 242xES1, 0x26 = 242xES2.2
+ *	2430: 0x31 = 2430ES1, 0x32 = 2430ES2
+ *
+ * The if the DPLL is going to AutoIdle. It seems like the DPLL may be back on
+ * when we get called, but the DLL probably isn't.  We will wait a bit more in
+ * case the DPLL isn't quite there yet. The code will wait on DLL for DDR even
+ * if in unlocked mode.
+ *
+ * For less than 242x-ES2.2 upon wake from a sleep mode where the external
+ * oscillator was stopped, a timing bug exists where a non-stabilized 12MHz
+ * clock can pass into the PRCM can cause problems at DSP and IVA.
+ * To work around this the code will switch to the 32kHz source prior to sleep.
+ * Post sleep we will shift back to using the DPLL.  Apparently,
+ * CM_IDLEST_CLKGEN does not reflect the full clock change so you need to wait
+ * 3x12MHz + 3x32kHz clocks for a full switch.
+ *
+ * The DLL load value is not kept in RETENTION or OFF.	It needs to be restored
+ * at wake
+ */
+ENTRY(omap24xx_cpu_suspend)
+	stmfd	sp!, {r0 - r12, lr}	@ save registers on stack
+	mov	r3, #0x0		@ clear for mrc call
+	mcr	p15, 0, r3, c7, c10, 4	@ memory barrier, hope SDR/DDR finished
+	nop
+	nop
+	ldr	r3, A_SDRC_POWER	@ addr of sdrc power
+	ldr	r4, [r3]		@ value of sdrc power
+	orr	r4, r4, #0x40		@ enable self refresh on idle req
+	mov	r5, #0x2000		@ set delay (DPLL relock + DLL relock)
+	str	r4, [r3]		@ make it so
+	mov	r2, #0
+	nop
+	mcr	p15, 0, r2, c7, c0, 4	@ wait for interrupt
+	nop
+loop:
+	subs	r5, r5, #0x1		@ awake, wait just a bit
+	bne	loop
+
+	/* The DPLL has on before we take the DDR out of self refresh */
+	bic	r4, r4, #0x40		@ now clear self refresh bit.
+	str	r4, [r3]		@ put vlaue back.
+	ldr	r4, A_SDRC0		@ make a clock happen
+	ldr	r4, [r4]
+	nop				@ start auto refresh only after clk ok
+	movs	r0, r0			@ see if DDR or SDR
+	ldrne	r1, A_SDRC_DLLA_CTRL_S	@ get addr of DLL ctrl
+	strne	r0, [r1]		@ rewrite DLLA to force DLL reload
+	addne	r1, r1, #0x8		@ move to DLLB
+	strne	r0, [r1]		@ rewrite DLLB to force DLL reload
+
+	mov	r5, #0x1000
+loop2:
+	subs	r5, r5, #0x1
+	bne	loop2
+	/* resume*/
+	ldmfd	sp!, {r0 - r12, pc}	@ restore regs and return
+
+A_SDRC_POWER:
+	.word A_SDRC_POWER_V
+A_SDRC0:
+	.word A_SDRC0_V
+A_CM_CLKSEL2_PLL_S:
+	.word A_CM_CLKSEL2_PLL_V
+A_CM_CLKEN_PLL:
+	.word A_CM_CLKEN_PLL_V
+A_SDRC_DLLA_CTRL_S:
+	.word A_SDRC_DLLA_CTRL_V
+A_SDRC_MANUAL_S:
+	.word A_SDRC_MANUAL_V
+
+ENTRY(omap24xx_cpu_suspend_sz)
+	.word	. - omap24xx_cpu_suspend
+

arch/arm/mach-omap2/sram-fn.S

···
 /*
- * linux/arch/arm/mach-omap1/sram.S
+ * linux/arch/arm/mach-omap2/sram.S
  *
  * Omap2 specific functions that need to be run in internal SRAM
  *
···
 #include <asm/arch/io.h>
 #include <asm/hardware.h>
 
-#include <asm/arch/prcm.h>
+#include "prcm-regs.h"
 
 #define TIMER_32KSYNCT_CR_V	IO_ADDRESS(OMAP24XX_32KSYNCT_BASE + 0x010)
 

arch/arm/plat-omap/pm.c

···
 #include <linux/pm.h>
 #include <linux/sched.h>
 #include <linux/proc_fs.h>
+#include <linux/pm.h>
 #include <linux/interrupt.h>
 
 #include <asm/io.h>

arch/arm/plat-omap/sleep.S arch/arm/mach-omap1/sleep.S

···
 /*
- * linux/arch/arm/plat-omap/sleep.S
+ * linux/arch/arm/mach-omap1/sleep.S
  *
  * Low-level OMAP730/1510/1610 sleep/wakeUp support
  *
···
 	mcr	p15, 0, r0, c7, c10, 4
 	nop
 
-	@ load base address of Traffic Controller
+	@ Load base address of Traffic Controller
 	mov	r6, #TCMIF_ASM_BASE & 0xff000000
 	orr	r6, r6, #TCMIF_ASM_BASE & 0x00ff0000
 	orr	r6, r6, #TCMIF_ASM_BASE & 0x0000ff00
 
-	@ prepare to put SDRAM into self-refresh manually
+	@ Prepare to put SDRAM into self-refresh manually
 	ldr	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
 	orr	r9, r7, #SELF_REFRESH_MODE & 0xff000000
 	orr	r9, r9, #SELF_REFRESH_MODE & 0x000000ff
 	str	r9, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
 
-	@ prepare to put EMIFS to Sleep
+	@ Prepare to put EMIFS to Sleep
 	ldr	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
 	orr	r9, r8, #IDLE_EMIFS_REQUEST & 0xff
 	str	r9, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
 
-	@ load base address of ARM_IDLECT1 and ARM_IDLECT2
+	@ Load base address of ARM_IDLECT1 and ARM_IDLECT2
 	mov	r4, #CLKGEN_REG_ASM_BASE & 0xff000000
 	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x00ff0000
 	orr	r4, r4, #CLKGEN_REG_ASM_BASE & 0x0000ff00
 
-	@ turn off clock domains
-	@ do not disable PERCK (0x04)
+	@ Turn off clock domains
+	@ Do not disable PERCK (0x04)
 	mov	r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff
 	orr	r5, r5, #OMAP1610_IDLECT2_SLEEP_VAL & 0xff00
 	strh	r5, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
 
-	@ request ARM idle
+	@ Request ARM idle
 	mov	r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff
 	orr	r3, r3, #OMAP1610_IDLECT1_SLEEP_VAL & 0xff00
 	strh	r3, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
-
-	@ disable instruction cache
-	mrc	p15, 0, r9, c1, c0, 0
-	bic	r2, r9, #0x1000
-	mcr	p15, 0, r2, c1, c0, 0
-	nop
 
 /*
  * Let's wait for the next wake up event to wake us up. r0 can't be
···
  */
 	mov	r2, #0
 	mcr	p15, 0, r2, c7, c0, 4		@ wait for interrupt
+
+	@ Errata (HEL3SU467, section 1.4.4) specifies nop-instructions
+	@ according to this formula:
+	@ 2 + (4*DPLL_MULT)/DPLL_DIV/ARMDIV
+	@ Max DPLL_MULT = 18
+	@ DPLL_DIV = 1
+	@ ARMDIV = 1
+	@ => 74 nop-instructions
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop	@10
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop	@20
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop	@30
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop	@40
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop	@50
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop	@60
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop
+	nop	@70
+	nop
+	nop
+	nop
+	nop	@74
 /*
  * omap1610_cpu_suspend()'s resume point.
  *
  * It will just start executing here, so we'll restore stuff from the
  * stack.
  */
-	@ re-enable Icache
-	mcr	p15, 0, r9, c1, c0, 0
-
-	@ reset the ARM_IDLECT1 and ARM_IDLECT2.
+	@ Restore the ARM_IDLECT1 and ARM_IDLECT2.
 	strh	r1, [r4, #ARM_IDLECT2_ASM_OFFSET & 0xff]
 	strh	r0, [r4, #ARM_IDLECT1_ASM_OFFSET & 0xff]
 
···
 	str	r7, [r6, #EMIFF_SDRAM_CONFIG_ASM_OFFSET & 0xff]
 	str	r8, [r6, #EMIFS_CONFIG_ASM_OFFSET & 0xff]
 
-	@ restore regs and return
+	@ Restore regs and return
 	ldmfd	sp!, {r0 - r12, pc}
 
 ENTRY(omap1610_cpu_suspend_sz)

arch/arm/plat-omap/sram.c

···
 #include <linux/kernel.h>
 #include <linux/init.h>
 
-#include <asm/mach/map.h>
 #include <asm/tlb.h>
 #include <asm/io.h>
 #include <asm/cacheflush.h>
 
+#include <asm/mach/map.h>
+
 #include <asm/arch/sram.h>
+#include <asm/arch/board.h>
 
 #define OMAP1_SRAM_PA		0x20000000
 #define OMAP1_SRAM_VA		0xd0000000
 #define OMAP2_SRAM_PA		0x40200000
+#define OMAP2_SRAM_PUB_PA	0x4020f800
 #define OMAP2_SRAM_VA		0xd0000000
+#define OMAP2_SRAM_PUB_VA	0xd0000800
 
+#if defined(CONFIG_ARCH_OMAP24XX)
+#define SRAM_BOOTLOADER_SZ	0x00
+#else
 #define SRAM_BOOTLOADER_SZ	0x80
+#endif
+
+#define VA_REQINFOPERM0		IO_ADDRESS(0x68005048)
+#define VA_READPERM0		IO_ADDRESS(0x68005050)
+#define VA_WRITEPERM0		IO_ADDRESS(0x68005058)
+#define VA_CONTROL_STAT		IO_ADDRESS(0x480002F8)
+#define GP_DEVICE		0x300
+#define TYPE_MASK		0x700
+
+#define ROUND_DOWN(value,boundary)	((value) & (~((boundary)-1)))
 
 static unsigned long omap_sram_base;
 static unsigned long omap_sram_size;
 static unsigned long omap_sram_ceil;
+
+unsigned long omap_fb_sram_start;
+unsigned long omap_fb_sram_size;
+
+/* Depending on the target RAMFS firewall setup, the public usable amount of
+ * SRAM varies.  The default accessable size for all device types is 2k. A GP
+ * device allows ARM11 but not other initators for full size. This
+ * functionality seems ok until some nice security API happens.
+ */
+static int is_sram_locked(void)
+{
+	int type = 0;
+
+	if (cpu_is_omap242x())
+		type = __raw_readl(VA_CONTROL_STAT) & TYPE_MASK;
+
+	if (type == GP_DEVICE) {
+		/* RAMFW: R/W access to all initators for all qualifier sets */
+		if (cpu_is_omap242x()) {
+			__raw_writel(0xFF, VA_REQINFOPERM0); /* all q-vects */
+			__raw_writel(0xCFDE, VA_READPERM0);  /* all i-read */
+			__raw_writel(0xCFDE, VA_WRITEPERM0); /* all i-write */
+		}
+		return 0;
+	} else
+		return 1; /* assume locked with no PPA or security driver */
+}
+
+void get_fb_sram_conf(unsigned long start_avail, unsigned size_avail,
+		      unsigned long *start, unsigned long *size)
+{
+	const struct omap_fbmem_config *fbmem_conf;
+
+	fbmem_conf = omap_get_config(OMAP_TAG_FBMEM, struct omap_fbmem_config);
+	if (fbmem_conf != NULL) {
+		*start = fbmem_conf->fb_sram_start;
+		*size = fbmem_conf->fb_sram_size;
+	} else {
+		*size = 0;
+		*start = 0;
+	}
+
+	if (*size && (
+	    *start < start_avail ||
+	    *start + *size > start_avail + size_avail)) {
+		printk(KERN_ERR "invalid FB SRAM configuration\n");
+		*start = start_avail;
+		*size = size_avail;
+	}
+
+	if (*size)
+		pr_info("Reserving %lu bytes SRAM for frame buffer\n", *size);
+}
 
 /*
  * The amount of SRAM depends on the core type.
···
  */
 void __init omap_detect_sram(void)
 {
-	if (!cpu_is_omap24xx())
+	unsigned long sram_start;
+
+	if (cpu_is_omap24xx()) {
+		if (is_sram_locked()) {
+			omap_sram_base = OMAP2_SRAM_PUB_VA;
+			sram_start = OMAP2_SRAM_PUB_PA;
+			omap_sram_size = 0x800; /* 2K */
+		} else {
+			omap_sram_base = OMAP2_SRAM_VA;
+			sram_start = OMAP2_SRAM_PA;
+			if (cpu_is_omap242x())
+				omap_sram_size = 0xa0000; /* 640K */
+			else if (cpu_is_omap243x())
+				omap_sram_size = 0x10000; /* 64K */
+		}
+	} else {
 		omap_sram_base = OMAP1_SRAM_VA;
-	else
-		omap_sram_base = OMAP2_SRAM_VA;
+		sram_start = OMAP1_SRAM_PA;
 
-	if (cpu_is_omap730())
-		omap_sram_size = 0x32000;	/* 200K */
-	else if (cpu_is_omap15xx())
-		omap_sram_size = 0x30000;	/* 192K */
-	else if (cpu_is_omap1610() || cpu_is_omap1621() || cpu_is_omap1710())
-		omap_sram_size = 0x4000;	/* 16K */
-	else if (cpu_is_omap1611())
-		omap_sram_size = 0x3e800;	/* 250K */
-	else if (cpu_is_omap2420())
-		omap_sram_size = 0xa0014;	/* 640K */
-	else {
-		printk(KERN_ERR "Could not detect SRAM size\n");
-		omap_sram_size = 0x4000;
+		if (cpu_is_omap730())
+			omap_sram_size = 0x32000;	/* 200K */
+		else if (cpu_is_omap15xx())
+			omap_sram_size = 0x30000;	/* 192K */
+		else if (cpu_is_omap1610() || cpu_is_omap1621() ||
+		     cpu_is_omap1710())
+			omap_sram_size = 0x4000;	/* 16K */
+		else if (cpu_is_omap1611())
+			omap_sram_size = 0x3e800;	/* 250K */
+		else {
+			printk(KERN_ERR "Could not detect SRAM size\n");
+			omap_sram_size = 0x4000;
+		}
 	}
-
+	get_fb_sram_conf(sram_start + SRAM_BOOTLOADER_SZ,
+			 omap_sram_size - SRAM_BOOTLOADER_SZ,
+			 &omap_fb_sram_start, &omap_fb_sram_size);
+	if (omap_fb_sram_size)
+		omap_sram_size -= sram_start + omap_sram_size -
+				  omap_fb_sram_start;
 	omap_sram_ceil = omap_sram_base + omap_sram_size;
 }
 
···
  */
 void __init omap_map_sram(void)
 {
+	unsigned long base;
+
 	if (omap_sram_size == 0)
 		return;
 
 	if (cpu_is_omap24xx()) {
 		omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
-		omap_sram_io_desc[0].pfn = __phys_to_pfn(OMAP2_SRAM_PA);
+
+		if (is_sram_locked())
+			base = OMAP2_SRAM_PUB_PA;
+		else
+			base = OMAP2_SRAM_PA;
+		base = ROUND_DOWN(base, PAGE_SIZE);
+		omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
 	}
 
 	omap_sram_io_desc[0].length = (omap_sram_size + PAGE_SIZE-1)/PAGE_SIZE;
···
 	iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
 
 	printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
-	       omap_sram_io_desc[0].pfn, omap_sram_io_desc[0].virtual,
+	__pfn_to_phys(omap_sram_io_desc[0].pfn),
+	omap_sram_io_desc[0].virtual,
 	       omap_sram_io_desc[0].length);
 
 	/*
···
 		printk(KERN_ERR "Not enough space in SRAM\n");
 		return NULL;
 	}
+
 	omap_sram_ceil -= size;
-	omap_sram_ceil &= ~0x3;
+	omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
 	memcpy((void *)omap_sram_ceil, start, size);
 
 	return (void *)omap_sram_ceil;

include/asm-arm/arch-omap/pm.h

···
 
 /*
  * ----------------------------------------------------------------------------
- * Powermanagement bitmasks
+ * Power management bitmasks
  * ----------------------------------------------------------------------------
  */
 #define IDLE_WAIT_CYCLES		0x00000fff
···
 #endif
 
 #ifndef __ASSEMBLER__
+
+#include <linux/clk.h>
+
+extern void prevent_idle_sleep(void);
+extern void allow_idle_sleep(void);
+
+/**
+ * clk_deny_idle - Prevents the clock from being idled during MPU idle
+ * @clk: clock signal handle
+ */
+void clk_deny_idle(struct clk *clk);
+
+/**
+ * clk_allow_idle - Counters previous clk_deny_idle
+ * @clk: clock signal handle
+ */
+void clk_deny_idle(struct clk *clk);
+
 extern void omap_pm_idle(void);
 extern void omap_pm_suspend(void);
 extern void omap730_cpu_suspend(unsigned short, unsigned short);
 extern void omap1510_cpu_suspend(unsigned short, unsigned short);
 extern void omap1610_cpu_suspend(unsigned short, unsigned short);
+extern void omap24xx_cpu_suspend(u32 dll_ctrl, u32 cpu_revision);
 extern void omap730_idle_loop_suspend(void);
 extern void omap1510_idle_loop_suspend(void);
 extern void omap1610_idle_loop_suspend(void);
+extern void omap24xx_idle_loop_suspend(void);
+
+extern unsigned int omap730_cpu_suspend_sz;
+extern unsigned int omap1510_cpu_suspend_sz;
+extern unsigned int omap1610_cpu_suspend_sz;
+extern unsigned int omap24xx_cpu_suspend_sz;
+extern unsigned int omap730_idle_loop_suspend_sz;
+extern unsigned int omap1510_idle_loop_suspend_sz;
+extern unsigned int omap1610_idle_loop_suspend_sz;
+extern unsigned int omap24xx_idle_loop_suspend_sz;
 
 #ifdef CONFIG_OMAP_SERIAL_WAKE
 extern void omap_serial_wake_trigger(int enable);
 #else
+#define omap_serial_wakeup_init()	{}
 #define omap_serial_wake_trigger(x)	{}
 #endif	/* CONFIG_OMAP_SERIAL_WAKE */
-
-extern unsigned int omap730_cpu_suspend_sz;
-extern unsigned int omap730_idle_loop_suspend_sz;
-extern unsigned int omap1510_cpu_suspend_sz;
-extern unsigned int omap1510_idle_loop_suspend_sz;
-extern unsigned int omap1610_cpu_suspend_sz;
-extern unsigned int omap1610_idle_loop_suspend_sz;
 
 #define ARM_SAVE(x) arm_sleep_save[ARM_SLEEP_SAVE_##x] = omap_readl(x)
 #define ARM_RESTORE(x) omap_writel((arm_sleep_save[ARM_SLEEP_SAVE_##x]), (x))
 #define ARM_SHOW(x) arm_sleep_save[ARM_SLEEP_SAVE_##x]
+
+#define DSP_SAVE(x) dsp_sleep_save[DSP_SLEEP_SAVE_##x] = __raw_readw(x)
+#define DSP_RESTORE(x) __raw_writew((dsp_sleep_save[DSP_SLEEP_SAVE_##x]), (x))
+#define DSP_SHOW(x) dsp_sleep_save[DSP_SLEEP_SAVE_##x]
 
 #define ULPD_SAVE(x) ulpd_sleep_save[ULPD_SLEEP_SAVE_##x] = omap_readw(x)
 #define ULPD_RESTORE(x) omap_writew((ulpd_sleep_save[ULPD_SLEEP_SAVE_##x]), (x))
···
 #define MPUI1610_SAVE(x) mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_##x] = omap_readl(x)
 #define MPUI1610_RESTORE(x) omap_writel((mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_##x]), (x))
 #define MPUI1610_SHOW(x) mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_##x]
+
+#define OMAP24XX_SAVE(x) omap24xx_sleep_save[OMAP24XX_SLEEP_SAVE_##x] = x
+#define OMAP24XX_RESTORE(x) x = omap24xx_sleep_save[OMAP24XX_SLEEP_SAVE_##x]
+#define OMAP24XX_SHOW(x) omap24xx_sleep_save[OMAP24XX_SLEEP_SAVE_##x]
 
 /*
  * List of global OMAP registers to preserve.
···
 	ARM_SLEEP_SAVE_ARM_RSTCT2,
 	ARM_SLEEP_SAVE_ARM_SYSST,
 	ARM_SLEEP_SAVE_SIZE
+};
+
+enum dsp_save_state {
+	DSP_SLEEP_SAVE_START = 0,
+	/*
+	 * DSP registers 16 bits
+	 */
+	DSP_SLEEP_SAVE_DSP_IDLECT2,
+	DSP_SLEEP_SAVE_SIZE
 };
 
 enum ulpd_save_state {
···
 #else
 	MPUI1610_SLEEP_SAVE_SIZE = 0
 #endif
+};
+
+enum omap24xx_save_state {
+	OMAP24XX_SLEEP_SAVE_START = 0,
+	OMAP24XX_SLEEP_SAVE_INTC_MIR0,
+	OMAP24XX_SLEEP_SAVE_INTC_MIR1,
+	OMAP24XX_SLEEP_SAVE_INTC_MIR2,
+	OMAP24XX_SLEEP_SAVE_CM_FCLKEN1_CORE,
+	OMAP24XX_SLEEP_SAVE_CM_FCLKEN2_CORE,
+	OMAP24XX_SLEEP_SAVE_CM_ICLKEN1_CORE,
+	OMAP24XX_SLEEP_SAVE_CM_ICLKEN2_CORE,
+	OMAP24XX_SLEEP_SAVE_CM_ICLKEN4_CORE,
+	OMAP24XX_SLEEP_SAVE_GPIO1_IRQENABLE1,
+	OMAP24XX_SLEEP_SAVE_GPIO2_IRQENABLE1,
+	OMAP24XX_SLEEP_SAVE_GPIO3_IRQENABLE1,
+	OMAP24XX_SLEEP_SAVE_GPIO4_IRQENABLE1,
+	OMAP24XX_SLEEP_SAVE_GPIO3_OE,
+	OMAP24XX_SLEEP_SAVE_GPIO4_OE,
+	OMAP24XX_SLEEP_SAVE_GPIO3_RISINGDETECT,
+	OMAP24XX_SLEEP_SAVE_GPIO3_FALLINGDETECT,
+	OMAP24XX_SLEEP_SAVE_CONTROL_PADCONF_SPI1_NCS2,
+	OMAP24XX_SLEEP_SAVE_CONTROL_PADCONF_MCBSP1_DX,
+	OMAP24XX_SLEEP_SAVE_CONTROL_PADCONF_SSI1_FLAG_TX,
+	OMAP24XX_SLEEP_SAVE_CONTROL_PADCONF_SYS_NIRQW0,
+	OMAP24XX_SLEEP_SAVE_SIZE
 };
 
 #endif /* ASSEMBLER */

include/asm-arm/arch-omap/sram.h

···
 				      u32 mem_type);
 extern u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 
+extern unsigned long omap_fb_sram_start;
+extern unsigned long omap_fb_sram_size;
 
 /* Do not use these */
 extern void sram_reprogram_clock(u32 ckctl, u32 dpllctl);