Merge with /shiny/git/linux-2.6/.git

1 files changed, 632 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/pm.c b/arch/arm/plat-omap/pm.c
new file mode 100644
index 0000000..e6536b1
--- /dev/null
+++ b/arch/arm/plat-omap/pm.c
@@ -0,0 +1,632 @@
+/*
+ * linux/arch/arm/plat-omap/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/pm.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/pm.h>
+
+#include <asm/io.h>
+#include <asm/mach/time.h>
+#include <asm/mach-types.h>
+
+#include <asm/arch/omap16xx.h>
+#include <asm/arch/pm.h>
+#include <asm/arch/mux.h>
+#include <asm/arch/tc.h>
+#include <asm/arch/tps65010.h>
+
+#include "clock.h"
+
+static unsigned int arm_sleep_save[ARM_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];
+
+/*
+ * 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)
+{
+	int (*func_ptr)(void) = 0;
+	unsigned int mask32 = 0;
+
+	/*
+	 * If the DSP is being used let's just idle the CPU, the overhead
+	 * to wake up from Big Sleep is big, milliseconds versus micro
+	 * seconds for wait for interrupt.
+	 */
+
+	local_irq_disable();
+	local_fiq_disable();
+	if (need_resched()) {
+		local_fiq_enable();
+		local_irq_enable();
+		return;
+	}
+	mask32 = omap_readl(ARM_SYSST);
+
+	/*
+	 * 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();
+
+	if ((mask32 & DSP_IDLE) == 0) {
+		__asm__ volatile ("mcr	p15, 0, r0, c7, c0, 4");
+	} else {
+
+		if (cpu_is_omap1510()) {
+			func_ptr = (void *)(OMAP1510_SRAM_IDLE_SUSPEND);
+		} else if (cpu_is_omap1610() || cpu_is_omap1710()) {
+			func_ptr = (void *)(OMAP1610_SRAM_IDLE_SUSPEND);
+		} else if (cpu_is_omap5912()) {
+			func_ptr = (void *)(OMAP5912_SRAM_IDLE_SUSPEND);
+		}
+
+		func_ptr();
+	}
+	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)
+{
+	/*
+	 * Enable ARM XOR clock and release peripheral from reset by
+	 * writing 1 to PER_EN bit in ARM_RSTCT2, this is required
+	 * for UART configuration to use UART2 to wake up.
+	 */
+
+	omap_writel(omap_readl(ARM_IDLECT2) | ENABLE_XORCLK, ARM_IDLECT2);
+	omap_writel(omap_readl(ARM_RSTCT2) | PER_EN, ARM_RSTCT2);
+	omap_writew(MODEM_32K_EN, ULPD_CLOCK_CTRL);
+
+	/*
+	 * Turn off all interrupts except L1-2nd level cascade,
+	 * and the L2 wakeup interrupts: keypad and UART2.
+	 */
+
+	omap_writel(~IRQ_LEVEL2, OMAP_IH1_MIR);
+
+	if (cpu_is_omap1510()) {
+		omap_writel(~(IRQ_UART2 | IRQ_KEYBOARD),  OMAP_IH2_MIR);
+	}
+
+	if (cpu_is_omap16xx()) {
+		omap_writel(~(IRQ_UART2 | IRQ_KEYBOARD), OMAP_IH2_0_MIR);
+
+		omap_writel(~0x0, OMAP_IH2_1_MIR);
+		omap_writel(~0x0, OMAP_IH2_2_MIR);
+		omap_writel(~0x0, OMAP_IH2_3_MIR);
+	}
+
+	/*  New IRQ agreement */
+ 	omap_writel(1, OMAP_IH1_CONTROL);
+
+	/* external PULL to down, bit 22 = 0 */
+	omap_writel(omap_readl(PULL_DWN_CTRL_2) & ~(1<<22), PULL_DWN_CTRL_2);
+}
+
+void omap_pm_suspend(void)
+{
+	unsigned int mask32 = 0;
+	unsigned long arg0 = 0, arg1 = 0;
+	int (*func_ptr)(unsigned short, unsigned short) = 0;
+	unsigned short save_dsp_idlect2;
+
+	printk("PM: OMAP%x is entering deep sleep now ...\n", system_rev);
+
+	if (machine_is_omap_osk()) {
+		/* Stop LED1 (D9) blink */
+		tps65010_set_led(LED1, OFF);
+	}
+
+	/*
+	 * Step 1: turn off interrupts
+	 */
+
+	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_omap1510()) {
+		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);
+	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: LOW_PWR signal enabling
+	 *
+	 * Allow the LOW_PWR signal to be visible on MPUIO5 ball.
+	 */
+	if (cpu_is_omap1510()) {
+		/* POWER_CTRL_REG = 0x1 (LOW_POWER is available) */
+		omap_writew(omap_readw(ULPD_POWER_CTRL) |
+			    OMAP1510_ULPD_LOW_POWER_REQ, ULPD_POWER_CTRL);
+	} else if (cpu_is_omap16xx()) {
+		/* POWER_CTRL_REG = 0x1 (LOW_POWER is available) */
+		omap_writew(omap_readw(ULPD_POWER_CTRL) |
+			    OMAP1610_ULPD_LOW_POWER_REQ, ULPD_POWER_CTRL);
+	}
+
+	/* configure LOW_PWR pin */
+	omap_cfg_reg(T20_1610_LOW_PWR);
+
+	/*
+	 * Step 4: OMAP DSP Shutdown
+	 */
+
+	/* Set DSP_RST = 1 and DSP_EN = 0, put DSP block into reset */
+	omap_writel((omap_readl(ARM_RSTCT1) | DSP_RST) & ~DSP_ENABLE,
+		    ARM_RSTCT1);
+
+	/* Set DSP boot mode to DSP-IDLE, DSP_BOOT_MODE = 0x2 */
+        omap_writel(DSP_IDLE_MODE, MPUI_DSP_BOOT_CONFIG);
+
+	/* Set EN_DSPCK = 0, stop DSP block clock */
+	omap_writel(omap_readl(ARM_CKCTL) & ~DSP_CLOCK_ENABLE, ARM_CKCTL);
+
+	/* Stop any DSP domain clocks */
+	omap_writel(omap_readl(ARM_IDLECT2) | (1<<EN_APICK), ARM_IDLECT2);
+	save_dsp_idlect2 = __raw_readw(DSP_IDLECT2);
+	__raw_writew(0, DSP_IDLECT2);
+
+	/*
+	 * Step 5: Wakeup Event Setup
+	 */
+
+	omap_pm_wakeup_setup();
+
+	/*
+	 * Step 6a: ARM and Traffic controller shutdown
+	 *
+	 * Step 6 starts here with clock and watchdog disable
+	 */
+
+	/* stop clocks */
+	mask32 = omap_readl(ARM_IDLECT2);
+	mask32 &= ~(1<<EN_WDTCK);  /* bit 0 -> 0 (WDT clock) */
+	mask32 |=  (1<<EN_XORPCK); /* bit 1 -> 1 (XORPCK clock) */
+	mask32 &= ~(1<<EN_PERCK);  /* bit 2 -> 0 (MPUPER_CK clock) */
+	mask32 &= ~(1<<EN_LCDCK);  /* bit 3 -> 0 (LCDC clock) */
+	mask32 &= ~(1<<EN_LBCK);   /* bit 4 -> 0 (local bus clock) */
+	mask32 |=  (1<<EN_APICK);  /* bit 6 -> 1 (MPUI clock) */
+	mask32 &= ~(1<<EN_TIMCK);  /* bit 7 -> 0 (MPU timer clock) */
+	mask32 &= ~(1<<DMACK_REQ); /* bit 8 -> 0 (DMAC clock) */
+	mask32 &= ~(1<<EN_GPIOCK); /* bit 9 -> 0 (GPIO clock) */
+	omap_writel(mask32, ARM_IDLECT2);
+
+	/* 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];
+
+	if (cpu_is_omap1510()) {
+		func_ptr = (void *)(OMAP1510_SRAM_API_SUSPEND);
+	} else if (cpu_is_omap1610() || cpu_is_omap1710()) {
+		func_ptr = (void *)(OMAP1610_SRAM_API_SUSPEND);
+	} else if (cpu_is_omap5912()) {
+		func_ptr = (void *)(OMAP5912_SRAM_API_SUSPEND);
+	}
+
+	/*
+	 * Step 6c: ARM and Traffic controller shutdown
+	 *
+	 * Jump to assembly code. The processor will stay there
+ 	 * until wake up.
+	 */
+
+        func_ptr(arg0, arg1);
+
+	/*
+	 * If we are here, processor is woken up!
+	 */
+
+	if (cpu_is_omap1510()) {
+		/* POWER_CTRL_REG = 0x0 (LOW_POWER is disabled) */
+		omap_writew(omap_readw(ULPD_POWER_CTRL) &
+			    ~OMAP1510_ULPD_LOW_POWER_REQ, ULPD_POWER_CTRL);
+	} else if (cpu_is_omap16xx()) {
+		/* POWER_CTRL_REG = 0x0 (LOW_POWER is disabled) */
+		omap_writew(omap_readw(ULPD_POWER_CTRL) &
+			    ~OMAP1610_ULPD_LOW_POWER_REQ, ULPD_POWER_CTRL);
+	}
+
+
+	/* Restore DSP clocks */
+	omap_writel(omap_readl(ARM_IDLECT2) | (1<<EN_APICK), ARM_IDLECT2);
+	__raw_writew(save_dsp_idlect2, DSP_IDLECT2);
+	ARM_RESTORE(ARM_IDLECT2);
+
+	/*
+	 * Restore ARM state, except ARM_IDLECT1/2 which omap_cpu_suspend did
+	 */
+
+	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_omap1510()) {
+		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);
+	}
+
+	/*
+	 * Reenable interrupts
+	 */
+
+	local_irq_enable();
+	local_fiq_enable();
+
+	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);
+	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_omap1510()) {
+		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_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_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_omap1510()) {
+			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, 0);
+}
+
+#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;
+}
+
+
+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");
+	pm_idle = omap_pm_idle;
+	/*
+	 * 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.
+	 */
+
+#ifdef	CONFIG_ARCH_OMAP1510
+	if (cpu_is_omap1510()) {
+		memcpy((void *)OMAP1510_SRAM_IDLE_SUSPEND,
+		       omap1510_idle_loop_suspend,
+		       omap1510_idle_loop_suspend_sz);
+		memcpy((void *)OMAP1510_SRAM_API_SUSPEND, omap1510_cpu_suspend,
+		       omap1510_cpu_suspend_sz);
+	} else
+#endif
+	if (cpu_is_omap1610() || cpu_is_omap1710()) {
+		memcpy((void *)OMAP1610_SRAM_IDLE_SUSPEND,
+		       omap1610_idle_loop_suspend,
+		       omap1610_idle_loop_suspend_sz);
+		memcpy((void *)OMAP1610_SRAM_API_SUSPEND, omap1610_cpu_suspend,
+		       omap1610_cpu_suspend_sz);
+	} else if (cpu_is_omap5912()) {
+		memcpy((void *)OMAP5912_SRAM_IDLE_SUSPEND,
+		       omap1610_idle_loop_suspend,
+		       omap1610_idle_loop_suspend_sz);
+		memcpy((void *)OMAP5912_SRAM_API_SUSPEND, omap1610_cpu_suspend,
+		       omap1610_cpu_suspend_sz);
+	}
+
+	pm_set_ops(&omap_pm_ops);
+
+#if defined(DEBUG) && defined(CONFIG_PROC_FS)
+	omap_pm_init_proc();
+#endif
+
+	return 0;
+}
+__initcall(omap_pm_init);
+