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pm24xx.c

/*
 * OMAP2 Power Management Routines
 *
 * Copyright (C) 2005 Texas Instruments, Inc.
 * Copyright (C) 2006-2008 Nokia Corporation
 *
 * Written by:
 * Richard Woodruff <r-woodruff2@ti.com>
 * Tony Lindgren
 * Juha Yrjola
 * Amit Kucheria <amit.kucheria@nokia.com>
 * Igor Stoppa <igor.stoppa@nokia.com>
 *
 * 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/suspend.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/time.h>
#include <linux/gpio.h>
#include <linux/console.h>

#include <asm/mach/time.h>
#include <asm/mach/irq.h>
#include <asm/mach-types.h>

#include <mach/irqs.h>
#include <plat/clock.h>
#include <plat/sram.h>
#include <plat/dma.h>
#include <plat/board.h>

#include "prm2xxx_3xxx.h"
#include "prm-regbits-24xx.h"
#include "cm2xxx_3xxx.h"
#include "cm-regbits-24xx.h"
#include "sdrc.h"
#include "pm.h"
#include "control.h"

#include "powerdomain.h"
#include "clockdomain.h"

#ifdef CONFIG_SUSPEND
static suspend_state_t suspend_state = PM_SUSPEND_ON;
static inline bool is_suspending(void)
{
      return (suspend_state != PM_SUSPEND_ON);
}
#else
static inline bool is_suspending(void)
{
      return false;
}
#endif

static void (*omap2_sram_idle)(void);
static void (*omap2_sram_suspend)(u32 dllctrl, void __iomem *sdrc_dlla_ctrl,
                          void __iomem *sdrc_power);

static struct powerdomain *mpu_pwrdm, *core_pwrdm;
static struct clockdomain *dsp_clkdm, *mpu_clkdm, *wkup_clkdm, *gfx_clkdm;

static struct clk *osc_ck, *emul_ck;

static int omap2_fclks_active(void)
{
      u32 f1, f2;

      f1 = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
      f2 = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);

      /* Ignore UART clocks.  These are handled by UART core (serial.c) */
      f1 &= ~(OMAP24XX_EN_UART1_MASK | OMAP24XX_EN_UART2_MASK);
      f2 &= ~OMAP24XX_EN_UART3_MASK;

      if (f1 | f2)
            return 1;
      return 0;
}

static void omap2_enter_full_retention(void)
{
      u32 l;
      struct timespec ts_preidle, ts_postidle, ts_idle;

      /* There is 1 reference hold for all children of the oscillator
       * clock, the following will remove it. If no one else uses the
       * oscillator itself it will be disabled if/when we enter retention
       * mode.
       */
      clk_disable(osc_ck);

      /* Clear old wake-up events */
      /* REVISIT: These write to reserved bits? */
      omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
      omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
      omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);

      /*
       * Set MPU powerdomain's next power state to RETENTION;
       * preserve logic state during retention
       */
      pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
      pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);

      /* Workaround to kill USB */
      l = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0) | OMAP24XX_USBSTANDBYCTRL;
      omap_ctrl_writel(l, OMAP2_CONTROL_DEVCONF0);

      omap2_gpio_prepare_for_idle(0);

      if (omap2_pm_debug) {
            omap2_pm_dump(0, 0, 0);
            getnstimeofday(&ts_preidle);
      }

      /* One last check for pending IRQs to avoid extra latency due
       * to sleeping unnecessarily. */
      if (omap_irq_pending())
            goto no_sleep;

      /* Block console output in case it is on one of the OMAP UARTs */
      if (!is_suspending())
            if (try_acquire_console_sem())
                  goto no_sleep;

      omap_uart_prepare_idle(0);
      omap_uart_prepare_idle(1);
      omap_uart_prepare_idle(2);

      /* Jump to SRAM suspend code */
      omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL),
                     OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL),
                     OMAP_SDRC_REGADDR(SDRC_POWER));

      omap_uart_resume_idle(2);
      omap_uart_resume_idle(1);
      omap_uart_resume_idle(0);

      if (!is_suspending())
            release_console_sem();

no_sleep:
      if (omap2_pm_debug) {
            unsigned long long tmp;

            getnstimeofday(&ts_postidle);
            ts_idle = timespec_sub(ts_postidle, ts_preidle);
            tmp = timespec_to_ns(&ts_idle) * NSEC_PER_USEC;
            omap2_pm_dump(0, 1, tmp);
      }
      omap2_gpio_resume_after_idle();

      clk_enable(osc_ck);

      /* clear CORE wake-up events */
      omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
      omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);

      /* wakeup domain events - bit 1: GPT1, bit5 GPIO */
      omap2_prm_clear_mod_reg_bits(0x4 | 0x1, WKUP_MOD, PM_WKST);

      /* MPU domain wake events */
      l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
      if (l & 0x01)
            omap2_prm_write_mod_reg(0x01, OCP_MOD,
                          OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
      if (l & 0x20)
            omap2_prm_write_mod_reg(0x20, OCP_MOD,
                          OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);

      /* Mask future PRCM-to-MPU interrupts */
      omap2_prm_write_mod_reg(0x0, OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET);
}

static int omap2_i2c_active(void)
{
      u32 l;

      l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
      return l & (OMAP2420_EN_I2C2_MASK | OMAP2420_EN_I2C1_MASK);
}

static int sti_console_enabled;

static int omap2_allow_mpu_retention(void)
{
      u32 l;

      /* Check for MMC, UART2, UART1, McSPI2, McSPI1 and DSS1. */
      l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
      if (l & (OMAP2420_EN_MMC_MASK | OMAP24XX_EN_UART2_MASK |
             OMAP24XX_EN_UART1_MASK | OMAP24XX_EN_MCSPI2_MASK |
             OMAP24XX_EN_MCSPI1_MASK | OMAP24XX_EN_DSS1_MASK))
            return 0;
      /* Check for UART3. */
      l = omap2_cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
      if (l & OMAP24XX_EN_UART3_MASK)
            return 0;
      if (sti_console_enabled)
            return 0;

      return 1;
}

static void omap2_enter_mpu_retention(void)
{
      int only_idle = 0;
      struct timespec ts_preidle, ts_postidle, ts_idle;

      /* Putting MPU into the WFI state while a transfer is active
       * seems to cause the I2C block to timeout. Why? Good question. */
      if (omap2_i2c_active())
            return;

      /* The peripherals seem not to be able to wake up the MPU when
       * it is in retention mode. */
      if (omap2_allow_mpu_retention()) {
            /* REVISIT: These write to reserved bits? */
            omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, PM_WKST1);
            omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP24XX_PM_WKST2);
            omap2_prm_write_mod_reg(0xffffffff, WKUP_MOD, PM_WKST);

            /* Try to enter MPU retention */
            omap2_prm_write_mod_reg((0x01 << OMAP_POWERSTATE_SHIFT) |
                          OMAP_LOGICRETSTATE_MASK,
                          MPU_MOD, OMAP2_PM_PWSTCTRL);
      } else {
            /* Block MPU retention */

            omap2_prm_write_mod_reg(OMAP_LOGICRETSTATE_MASK, MPU_MOD,
                                     OMAP2_PM_PWSTCTRL);
            only_idle = 1;
      }

      if (omap2_pm_debug) {
            omap2_pm_dump(only_idle ? 2 : 1, 0, 0);
            getnstimeofday(&ts_preidle);
      }

      omap2_sram_idle();

      if (omap2_pm_debug) {
            unsigned long long tmp;

            getnstimeofday(&ts_postidle);
            ts_idle = timespec_sub(ts_postidle, ts_preidle);
            tmp = timespec_to_ns(&ts_idle) * NSEC_PER_USEC;
            omap2_pm_dump(only_idle ? 2 : 1, 1, tmp);
      }
}

static int omap2_can_sleep(void)
{
      if (omap2_fclks_active())
            return 0;
      if (!omap_uart_can_sleep())
            return 0;
      if (osc_ck->usecount > 1)
            return 0;
      if (omap_dma_running())
            return 0;

      return 1;
}

static void omap2_pm_idle(void)
{
      local_irq_disable();
      local_fiq_disable();

      if (!omap2_can_sleep()) {
            if (omap_irq_pending())
                  goto out;
            omap2_enter_mpu_retention();
            goto out;
      }

      if (omap_irq_pending())
            goto out;

      omap2_enter_full_retention();

out:
      local_fiq_enable();
      local_irq_enable();
}

#ifdef CONFIG_SUSPEND
static int omap2_pm_begin(suspend_state_t state)
{
      disable_hlt();
      suspend_state = state;
      return 0;
}

static int omap2_pm_suspend(void)
{
      u32 wken_wkup, mir1;

      wken_wkup = omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN);
      wken_wkup &= ~OMAP24XX_EN_GPT1_MASK;
      omap2_prm_write_mod_reg(wken_wkup, WKUP_MOD, PM_WKEN);

      /* Mask GPT1 */
      mir1 = omap_readl(0x480fe0a4);
      omap_writel(1 << 5, 0x480fe0ac);

      omap_uart_prepare_suspend();
      omap2_enter_full_retention();

      omap_writel(mir1, 0x480fe0a4);
      omap2_prm_write_mod_reg(wken_wkup, WKUP_MOD, PM_WKEN);

      return 0;
}

static int omap2_pm_enter(suspend_state_t state)
{
      int ret = 0;

      switch (state) {
      case PM_SUSPEND_STANDBY:
      case PM_SUSPEND_MEM:
            ret = omap2_pm_suspend();
            break;
      default:
            ret = -EINVAL;
      }

      return ret;
}

static void omap2_pm_end(void)
{
      suspend_state = PM_SUSPEND_ON;
      enable_hlt();
}

static const struct platform_suspend_ops omap_pm_ops = {
      .begin            = omap2_pm_begin,
      .enter            = omap2_pm_enter,
      .end        = omap2_pm_end,
      .valid            = suspend_valid_only_mem,
};
#else
static const struct platform_suspend_ops __initdata omap_pm_ops;
#endif /* CONFIG_SUSPEND */

/* XXX This function should be shareable between OMAP2xxx and OMAP3 */
static int __init clkdms_setup(struct clockdomain *clkdm, void *unused)
{
      clkdm_clear_all_wkdeps(clkdm);
      clkdm_clear_all_sleepdeps(clkdm);

      if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
            omap2_clkdm_allow_idle(clkdm);
      else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
             atomic_read(&clkdm->usecount) == 0)
            omap2_clkdm_sleep(clkdm);
      return 0;
}

static void __init prcm_setup_regs(void)
{
      int i, num_mem_banks;
      struct powerdomain *pwrdm;

      /* Enable autoidle */
      omap2_prm_write_mod_reg(OMAP24XX_AUTOIDLE_MASK, OCP_MOD,
                    OMAP2_PRCM_SYSCONFIG_OFFSET);

      /*
       * Set CORE powerdomain memory banks to retain their contents
       * during RETENTION
       */
      num_mem_banks = pwrdm_get_mem_bank_count(core_pwrdm);
      for (i = 0; i < num_mem_banks; i++)
            pwrdm_set_mem_retst(core_pwrdm, i, PWRDM_POWER_RET);

      /* Set CORE powerdomain's next power state to RETENTION */
      pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);

      /*
       * Set MPU powerdomain's next power state to RETENTION;
       * preserve logic state during retention
       */
      pwrdm_set_logic_retst(mpu_pwrdm, PWRDM_POWER_RET);
      pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);

      /* Force-power down DSP, GFX powerdomains */

      pwrdm = clkdm_get_pwrdm(dsp_clkdm);
      pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
      omap2_clkdm_sleep(dsp_clkdm);

      pwrdm = clkdm_get_pwrdm(gfx_clkdm);
      pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
      omap2_clkdm_sleep(gfx_clkdm);

      /*
       * Clear clockdomain wakeup dependencies and enable
       * hardware-supervised idle for all clkdms
       */
      clkdm_for_each(clkdms_setup, NULL);
      clkdm_add_wkdep(mpu_clkdm, wkup_clkdm);

      /* Enable clock autoidle for all domains */
      omap2_cm_write_mod_reg(OMAP24XX_AUTO_CAM_MASK |
                         OMAP24XX_AUTO_MAILBOXES_MASK |
                         OMAP24XX_AUTO_WDT4_MASK |
                         OMAP2420_AUTO_WDT3_MASK |
                         OMAP24XX_AUTO_MSPRO_MASK |
                         OMAP2420_AUTO_MMC_MASK |
                         OMAP24XX_AUTO_FAC_MASK |
                         OMAP2420_AUTO_EAC_MASK |
                         OMAP24XX_AUTO_HDQ_MASK |
                         OMAP24XX_AUTO_UART2_MASK |
                         OMAP24XX_AUTO_UART1_MASK |
                         OMAP24XX_AUTO_I2C2_MASK |
                         OMAP24XX_AUTO_I2C1_MASK |
                         OMAP24XX_AUTO_MCSPI2_MASK |
                         OMAP24XX_AUTO_MCSPI1_MASK |
                         OMAP24XX_AUTO_MCBSP2_MASK |
                         OMAP24XX_AUTO_MCBSP1_MASK |
                         OMAP24XX_AUTO_GPT12_MASK |
                         OMAP24XX_AUTO_GPT11_MASK |
                         OMAP24XX_AUTO_GPT10_MASK |
                         OMAP24XX_AUTO_GPT9_MASK |
                         OMAP24XX_AUTO_GPT8_MASK |
                         OMAP24XX_AUTO_GPT7_MASK |
                         OMAP24XX_AUTO_GPT6_MASK |
                         OMAP24XX_AUTO_GPT5_MASK |
                         OMAP24XX_AUTO_GPT4_MASK |
                         OMAP24XX_AUTO_GPT3_MASK |
                         OMAP24XX_AUTO_GPT2_MASK |
                         OMAP2420_AUTO_VLYNQ_MASK |
                         OMAP24XX_AUTO_DSS_MASK,
                         CORE_MOD, CM_AUTOIDLE1);
      omap2_cm_write_mod_reg(OMAP24XX_AUTO_UART3_MASK |
                         OMAP24XX_AUTO_SSI_MASK |
                         OMAP24XX_AUTO_USB_MASK,
                         CORE_MOD, CM_AUTOIDLE2);
      omap2_cm_write_mod_reg(OMAP24XX_AUTO_SDRC_MASK |
                         OMAP24XX_AUTO_GPMC_MASK |
                         OMAP24XX_AUTO_SDMA_MASK,
                         CORE_MOD, CM_AUTOIDLE3);
      omap2_cm_write_mod_reg(OMAP24XX_AUTO_PKA_MASK |
                         OMAP24XX_AUTO_AES_MASK |
                         OMAP24XX_AUTO_RNG_MASK |
                         OMAP24XX_AUTO_SHA_MASK |
                         OMAP24XX_AUTO_DES_MASK,
                         CORE_MOD, OMAP24XX_CM_AUTOIDLE4);

      omap2_cm_write_mod_reg(OMAP2420_AUTO_DSP_IPI_MASK, OMAP24XX_DSP_MOD,
                         CM_AUTOIDLE);

      /* Put DPLL and both APLLs into autoidle mode */
      omap2_cm_write_mod_reg((0x03 << OMAP24XX_AUTO_DPLL_SHIFT) |
                         (0x03 << OMAP24XX_AUTO_96M_SHIFT) |
                         (0x03 << OMAP24XX_AUTO_54M_SHIFT),
                         PLL_MOD, CM_AUTOIDLE);

      omap2_cm_write_mod_reg(OMAP24XX_AUTO_OMAPCTRL_MASK |
                         OMAP24XX_AUTO_WDT1_MASK |
                         OMAP24XX_AUTO_MPU_WDT_MASK |
                         OMAP24XX_AUTO_GPIOS_MASK |
                         OMAP24XX_AUTO_32KSYNC_MASK |
                         OMAP24XX_AUTO_GPT1_MASK,
                         WKUP_MOD, CM_AUTOIDLE);

      /* REVISIT: Configure number of 32 kHz clock cycles for sys_clk
       * stabilisation */
      omap2_prm_write_mod_reg(15 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
                        OMAP2_PRCM_CLKSSETUP_OFFSET);

      /* Configure automatic voltage transition */
      omap2_prm_write_mod_reg(2 << OMAP_SETUP_TIME_SHIFT, OMAP24XX_GR_MOD,
                        OMAP2_PRCM_VOLTSETUP_OFFSET);
      omap2_prm_write_mod_reg(OMAP24XX_AUTO_EXTVOLT_MASK |
                        (0x1 << OMAP24XX_SETOFF_LEVEL_SHIFT) |
                        OMAP24XX_MEMRETCTRL_MASK |
                        (0x1 << OMAP24XX_SETRET_LEVEL_SHIFT) |
                        (0x0 << OMAP24XX_VOLT_LEVEL_SHIFT),
                        OMAP24XX_GR_MOD, OMAP2_PRCM_VOLTCTRL_OFFSET);

      /* Enable wake-up events */
      omap2_prm_write_mod_reg(OMAP24XX_EN_GPIOS_MASK | OMAP24XX_EN_GPT1_MASK,
                        WKUP_MOD, PM_WKEN);
}

static int __init omap2_pm_init(void)
{
      u32 l;

      if (!cpu_is_omap24xx())
            return -ENODEV;

      printk(KERN_INFO "Power Management for OMAP2 initializing\n");
      l = omap2_prm_read_mod_reg(OCP_MOD, OMAP2_PRCM_REVISION_OFFSET);
      printk(KERN_INFO "PRCM revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);

      /* Look up important powerdomains */

      mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
      if (!mpu_pwrdm)
            pr_err("PM: mpu_pwrdm not found\n");

      core_pwrdm = pwrdm_lookup("core_pwrdm");
      if (!core_pwrdm)
            pr_err("PM: core_pwrdm not found\n");

      /* Look up important clockdomains */

      mpu_clkdm = clkdm_lookup("mpu_clkdm");
      if (!mpu_clkdm)
            pr_err("PM: mpu_clkdm not found\n");

      wkup_clkdm = clkdm_lookup("wkup_clkdm");
      if (!wkup_clkdm)
            pr_err("PM: wkup_clkdm not found\n");

      dsp_clkdm = clkdm_lookup("dsp_clkdm");
      if (!dsp_clkdm)
            pr_err("PM: dsp_clkdm not found\n");

      gfx_clkdm = clkdm_lookup("gfx_clkdm");
      if (!gfx_clkdm)
            pr_err("PM: gfx_clkdm not found\n");


      osc_ck = clk_get(NULL, "osc_ck");
      if (IS_ERR(osc_ck)) {
            printk(KERN_ERR "could not get osc_ck\n");
            return -ENODEV;
      }

      if (cpu_is_omap242x()) {
            emul_ck = clk_get(NULL, "emul_ck");
            if (IS_ERR(emul_ck)) {
                  printk(KERN_ERR "could not get emul_ck\n");
                  clk_put(osc_ck);
                  return -ENODEV;
            }
      }

      prcm_setup_regs();

      /* Hack to prevent MPU retention when STI console is enabled. */
      {
            const struct omap_sti_console_config *sti;

            sti = omap_get_config(OMAP_TAG_STI_CONSOLE,
                              struct omap_sti_console_config);
            if (sti != NULL && sti->enable)
                  sti_console_enabled = 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_omap24xx()) {
            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);
      }

      suspend_set_ops(&omap_pm_ops);
      pm_idle = omap2_pm_idle;

      return 0;
}

late_initcall(omap2_pm_init);

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