/* * OMAP3 Power Management Routines * * Copyright (C) 2006-2008 Nokia Corporation * Tony Lindgren * Jouni Hogander * * Copyright (C) 2007 Texas Instruments, Inc. * Rajendra Nayak * * Copyright (C) 2005 Texas Instruments, Inc. * Richard Woodruff * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include "clockdomain.h" #include "powerdomain.h" #include #include #include #include #include "common.h" #include "cm2xxx_3xxx.h" #include "cm-regbits-34xx.h" #include "prm-regbits-34xx.h" #include "prm2xxx_3xxx.h" #include "pm.h" #include "sdrc.h" #include "control.h" #ifdef CONFIG_SUSPEND static suspend_state_t suspend_state = PM_SUSPEND_ON; #endif /* pm34xx errata defined in pm.h */ u16 pm34xx_errata; struct power_state { struct powerdomain *pwrdm; u32 next_state; #ifdef CONFIG_SUSPEND u32 saved_state; #endif struct list_head node; }; static LIST_HEAD(pwrst_list); static int (*_omap_save_secure_sram)(u32 *addr); void (*omap3_do_wfi_sram)(void); static struct powerdomain *mpu_pwrdm, *neon_pwrdm; static struct powerdomain *core_pwrdm, *per_pwrdm; static struct powerdomain *cam_pwrdm; static inline void omap3_per_save_context(void) { omap_gpio_save_context(); } static inline void omap3_per_restore_context(void) { omap_gpio_restore_context(); } static void omap3_enable_io_chain(void) { int timeout = 0; omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD, PM_WKEN); /* Do a readback to assure write has been done */ omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN); while (!(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN) & OMAP3430_ST_IO_CHAIN_MASK)) { timeout++; if (timeout > 1000) { pr_err("Wake up daisy chain activation failed.\n"); return; } omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK, WKUP_MOD, PM_WKEN); } } static void omap3_disable_io_chain(void) { omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD, PM_WKEN); } static void omap3_core_save_context(void) { omap3_ctrl_save_padconf(); /* * Force write last pad into memory, as this can fail in some * cases according to errata 1.157, 1.185 */ omap_ctrl_writel(omap_ctrl_readl(OMAP343X_PADCONF_ETK_D14), OMAP343X_CONTROL_MEM_WKUP + 0x2a0); /* Save the Interrupt controller context */ omap_intc_save_context(); /* Save the GPMC context */ omap3_gpmc_save_context(); /* Save the system control module context, padconf already save above*/ omap3_control_save_context(); omap_dma_global_context_save(); } static void omap3_core_restore_context(void) { /* Restore the control module context, padconf restored by h/w */ omap3_control_restore_context(); /* Restore the GPMC context */ omap3_gpmc_restore_context(); /* Restore the interrupt controller context */ omap_intc_restore_context(); omap_dma_global_context_restore(); } /* * FIXME: This function should be called before entering off-mode after * OMAP3 secure services have been accessed. Currently it is only called * once during boot sequence, but this works as we are not using secure * services. */ static void omap3_save_secure_ram_context(void) { u32 ret; int mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm); if (omap_type() != OMAP2_DEVICE_TYPE_GP) { /* * MPU next state must be set to POWER_ON temporarily, * otherwise the WFI executed inside the ROM code * will hang the system. */ pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON); ret = _omap_save_secure_sram((u32 *) __pa(omap3_secure_ram_storage)); pwrdm_set_next_pwrst(mpu_pwrdm, mpu_next_state); /* Following is for error tracking, it should not happen */ if (ret) { printk(KERN_ERR "save_secure_sram() returns %08x\n", ret); while (1) ; } } } /* * PRCM Interrupt Handler Helper Function * * The purpose of this function is to clear any wake-up events latched * in the PRCM PM_WKST_x registers. It is possible that a wake-up event * may occur whilst attempting to clear a PM_WKST_x register and thus * set another bit in this register. A while loop is used to ensure * that any peripheral wake-up events occurring while attempting to * clear the PM_WKST_x are detected and cleared. */ static int prcm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits) { u32 wkst, fclk, iclk, clken; u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1; u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1; u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1; u16 grpsel_off = (regs == 3) ? OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL; int c = 0; wkst = omap2_prm_read_mod_reg(module, wkst_off); wkst &= omap2_prm_read_mod_reg(module, grpsel_off); wkst &= ~ignore_bits; if (wkst) { iclk = omap2_cm_read_mod_reg(module, iclk_off); fclk = omap2_cm_read_mod_reg(module, fclk_off); while (wkst) { clken = wkst; omap2_cm_set_mod_reg_bits(clken, module, iclk_off); /* * For USBHOST, we don't know whether HOST1 or * HOST2 woke us up, so enable both f-clocks */ if (module == OMAP3430ES2_USBHOST_MOD) clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT; omap2_cm_set_mod_reg_bits(clken, module, fclk_off); omap2_prm_write_mod_reg(wkst, module, wkst_off); wkst = omap2_prm_read_mod_reg(module, wkst_off); wkst &= ~ignore_bits; c++; } omap2_cm_write_mod_reg(iclk, module, iclk_off); omap2_cm_write_mod_reg(fclk, module, fclk_off); } return c; } static irqreturn_t _prcm_int_handle_io(int irq, void *unused) { int c; c = prcm_clear_mod_irqs(WKUP_MOD, 1, ~(OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK)); return c ? IRQ_HANDLED : IRQ_NONE; } static irqreturn_t _prcm_int_handle_wakeup(int irq, void *unused) { int c; /* * Clear all except ST_IO and ST_IO_CHAIN for wkup module, * these are handled in a separate handler to avoid acking * IO events before parsing in mux code */ c = prcm_clear_mod_irqs(WKUP_MOD, 1, OMAP3430_ST_IO_MASK | OMAP3430_ST_IO_CHAIN_MASK); c += prcm_clear_mod_irqs(CORE_MOD, 1, 0); c += prcm_clear_mod_irqs(OMAP3430_PER_MOD, 1, 0); if (omap_rev() > OMAP3430_REV_ES1_0) { c += prcm_clear_mod_irqs(CORE_MOD, 3, 0); c += prcm_clear_mod_irqs(OMAP3430ES2_USBHOST_MOD, 1, 0); } return c ? IRQ_HANDLED : IRQ_NONE; } static void omap34xx_save_context(u32 *save) { u32 val; /* Read Auxiliary Control Register */ asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (val)); *save++ = 1; *save++ = val; /* Read L2 AUX ctrl register */ asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (val)); *save++ = 1; *save++ = val; } static int omap34xx_do_sram_idle(unsigned long save_state) { omap34xx_cpu_suspend(save_state); return 0; } void omap_sram_idle(void) { /* Variable to tell what needs to be saved and restored * in omap_sram_idle*/ /* save_state = 0 => Nothing to save and restored */ /* save_state = 1 => Only L1 and logic lost */ /* save_state = 2 => Only L2 lost */ /* save_state = 3 => L1, L2 and logic lost */ int save_state = 0; int mpu_next_state = PWRDM_POWER_ON; int per_next_state = PWRDM_POWER_ON; int core_next_state = PWRDM_POWER_ON; int per_going_off; int core_prev_state, per_prev_state; u32 sdrc_pwr = 0; pwrdm_clear_all_prev_pwrst(mpu_pwrdm); pwrdm_clear_all_prev_pwrst(neon_pwrdm); pwrdm_clear_all_prev_pwrst(core_pwrdm); pwrdm_clear_all_prev_pwrst(per_pwrdm); mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm); switch (mpu_next_state) { case PWRDM_POWER_ON: case PWRDM_POWER_RET: /* No need to save context */ save_state = 0; break; case PWRDM_POWER_OFF: save_state = 3; break; default: /* Invalid state */ printk(KERN_ERR "Invalid mpu state in sram_idle\n"); return; } /* NEON control */ if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON) pwrdm_set_next_pwrst(neon_pwrdm, mpu_next_state); /* Enable IO-PAD and IO-CHAIN wakeups */ per_next_state = pwrdm_read_next_pwrst(per_pwrdm); core_next_state = pwrdm_read_next_pwrst(core_pwrdm); if (omap3_has_io_wakeup() && (per_next_state < PWRDM_POWER_ON || core_next_state < PWRDM_POWER_ON)) { omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, PM_WKEN); if (omap3_has_io_chain_ctrl()) omap3_enable_io_chain(); } pwrdm_pre_transition(); /* PER */ if (per_next_state < PWRDM_POWER_ON) { per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0; omap2_gpio_prepare_for_idle(per_going_off); if (per_next_state == PWRDM_POWER_OFF) omap3_per_save_context(); } /* CORE */ if (core_next_state < PWRDM_POWER_ON) { if (core_next_state == PWRDM_POWER_OFF) { omap3_core_save_context(); omap3_cm_save_context(); } } omap3_intc_prepare_idle(); /* * On EMU/HS devices ROM code restores a SRDC value * from scratchpad which has automatic self refresh on timeout * of AUTO_CNT = 1 enabled. This takes care of erratum ID i443. * Hence store/restore the SDRC_POWER register here. */ if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 && (omap_type() == OMAP2_DEVICE_TYPE_EMU || omap_type() == OMAP2_DEVICE_TYPE_SEC) && core_next_state == PWRDM_POWER_OFF) sdrc_pwr = sdrc_read_reg(SDRC_POWER); /* * omap3_arm_context is the location where some ARM context * get saved. The rest is placed on the stack, and restored * from there before resuming. */ if (save_state) omap34xx_save_context(omap3_arm_context); if (save_state == 1 || save_state == 3) cpu_suspend(save_state, omap34xx_do_sram_idle); else omap34xx_do_sram_idle(save_state); /* Restore normal SDRC POWER settings */ if (cpu_is_omap3430() && omap_rev() >= OMAP3430_REV_ES3_0 && (omap_type() == OMAP2_DEVICE_TYPE_EMU || omap_type() == OMAP2_DEVICE_TYPE_SEC) && core_next_state == PWRDM_POWER_OFF) sdrc_write_reg(sdrc_pwr, SDRC_POWER); /* CORE */ if (core_next_state < PWRDM_POWER_ON) { core_prev_state = pwrdm_read_prev_pwrst(core_pwrdm); if (core_prev_state == PWRDM_POWER_OFF) { omap3_core_restore_context(); omap3_cm_restore_context(); omap3_sram_restore_context(); omap2_sms_restore_context(); } if (core_next_state == PWRDM_POWER_OFF) omap2_prm_clear_mod_reg_bits(OMAP3430_AUTO_OFF_MASK, OMAP3430_GR_MOD, OMAP3_PRM_VOLTCTRL_OFFSET); } omap3_intc_resume_idle(); pwrdm_post_transition(); /* PER */ if (per_next_state < PWRDM_POWER_ON) { per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm); omap2_gpio_resume_after_idle(); if (per_prev_state == PWRDM_POWER_OFF) omap3_per_restore_context(); } /* Disable IO-PAD and IO-CHAIN wakeup */ if (omap3_has_io_wakeup() && (per_next_state < PWRDM_POWER_ON || core_next_state < PWRDM_POWER_ON)) { omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, PM_WKEN); if (omap3_has_io_chain_ctrl()) omap3_disable_io_chain(); } clkdm_allow_idle(mpu_pwrdm->pwrdm_clkdms[0]); } static void omap3_pm_idle(void) { local_irq_disable(); local_fiq_disable(); if (omap_irq_pending() || need_resched()) goto out; trace_power_start(POWER_CSTATE, 1, smp_processor_id()); trace_cpu_idle(1, smp_processor_id()); omap_sram_idle(); trace_power_end(smp_processor_id()); trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id()); out: local_fiq_enable(); local_irq_enable(); } #ifdef CONFIG_SUSPEND static int omap3_pm_suspend(void) { struct power_state *pwrst; int state, ret = 0; /* Read current next_pwrsts */ list_for_each_entry(pwrst, &pwrst_list, node) pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm); /* Set ones wanted by suspend */ list_for_each_entry(pwrst, &pwrst_list, node) { if (omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state)) goto restore; if (pwrdm_clear_all_prev_pwrst(pwrst->pwrdm)) goto restore; } omap3_intc_suspend(); omap_sram_idle(); restore: /* Restore next_pwrsts */ list_for_each_entry(pwrst, &pwrst_list, node) { state = pwrdm_read_prev_pwrst(pwrst->pwrdm); if (state > pwrst->next_state) { printk(KERN_INFO "Powerdomain (%s) didn't enter " "target state %d\n", pwrst->pwrdm->name, pwrst->next_state); ret = -1; } omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state); } if (ret) printk(KERN_ERR "Could not enter target state in pm_suspend\n"); else printk(KERN_INFO "Successfully put all powerdomains " "to target state\n"); return ret; } static int omap3_pm_enter(suspend_state_t unused) { int ret = 0; switch (suspend_state) { case PM_SUSPEND_STANDBY: case PM_SUSPEND_MEM: ret = omap3_pm_suspend(); break; default: ret = -EINVAL; } return ret; } /* Hooks to enable / disable UART interrupts during suspend */ static int omap3_pm_begin(suspend_state_t state) { disable_hlt(); suspend_state = state; omap_prcm_irq_prepare(); return 0; } static void omap3_pm_end(void) { suspend_state = PM_SUSPEND_ON; enable_hlt(); return; } static void omap3_pm_finish(void) { omap_prcm_irq_complete(); } static const struct platform_suspend_ops omap_pm_ops = { .begin = omap3_pm_begin, .end = omap3_pm_end, .enter = omap3_pm_enter, .finish = omap3_pm_finish, .valid = suspend_valid_only_mem, }; #endif /* CONFIG_SUSPEND */ /** * omap3_iva_idle(): ensure IVA is in idle so it can be put into * retention * * In cases where IVA2 is activated by bootcode, it may prevent * full-chip retention or off-mode because it is not idle. This * function forces the IVA2 into idle state so it can go * into retention/off and thus allow full-chip retention/off. * **/ static void __init omap3_iva_idle(void) { /* ensure IVA2 clock is disabled */ omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN); /* if no clock activity, nothing else to do */ if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) & OMAP3430_CLKACTIVITY_IVA2_MASK)) return; /* Reset IVA2 */ omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK | OMAP3430_RST2_IVA2_MASK | OMAP3430_RST3_IVA2_MASK, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); /* Enable IVA2 clock */ omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK, OMAP3430_IVA2_MOD, CM_FCLKEN); /* Set IVA2 boot mode to 'idle' */ omap_ctrl_writel(OMAP3_IVA2_BOOTMOD_IDLE, OMAP343X_CONTROL_IVA2_BOOTMOD); /* Un-reset IVA2 */ omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); /* Disable IVA2 clock */ omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN); /* Reset IVA2 */ omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK | OMAP3430_RST2_IVA2_MASK | OMAP3430_RST3_IVA2_MASK, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); } static void __init omap3_d2d_idle(void) { u16 mask, padconf; /* In a stand alone OMAP3430 where there is not a stacked * modem for the D2D Idle Ack and D2D MStandby must be pulled * high. S CONTROL_PADCONF_SAD2D_IDLEACK and * CONTROL_PADCONF_SAD2D_MSTDBY to have a pull up. */ mask = (1 << 4) | (1 << 3); /* pull-up, enabled */ padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_MSTANDBY); padconf |= mask; omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_MSTANDBY); padconf = omap_ctrl_readw(OMAP3_PADCONF_SAD2D_IDLEACK); padconf |= mask; omap_ctrl_writew(padconf, OMAP3_PADCONF_SAD2D_IDLEACK); /* reset modem */ omap2_prm_write_mod_reg(OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK | OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK, CORE_MOD, OMAP2_RM_RSTCTRL); omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL); } static void __init prcm_setup_regs(void) { u32 omap3630_en_uart4_mask = cpu_is_omap3630() ? OMAP3630_EN_UART4_MASK : 0; u32 omap3630_grpsel_uart4_mask = cpu_is_omap3630() ? OMAP3630_GRPSEL_UART4_MASK : 0; /* XXX This should be handled by hwmod code or SCM init code */ /* This causes MUSB failure on AM3517 so disable it. */ if (!cpu_is_omap3517() && !cpu_is_omap3505()) omap_ctrl_writel(OMAP3430_AUTOIDLE_MASK, OMAP2_CONTROL_SYSCONFIG); /* * Enable control of expternal oscillator through * sys_clkreq. In the long run clock framework should * take care of this. */ omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK, 1 << OMAP_AUTOEXTCLKMODE_SHIFT, OMAP3430_GR_MOD, OMAP3_PRM_CLKSRC_CTRL_OFFSET); /* setup wakup source */ omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK | OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK, WKUP_MOD, PM_WKEN); /* No need to write EN_IO, that is always enabled */ omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK | OMAP3430_GRPSEL_GPT1_MASK | OMAP3430_GRPSEL_GPT12_MASK, WKUP_MOD, OMAP3430_PM_MPUGRPSEL); /* Enable PM_WKEN to support DSS LPR */ omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK, OMAP3430_DSS_MOD, PM_WKEN); /* Enable wakeups in PER */ omap2_prm_write_mod_reg(omap3630_en_uart4_mask | OMAP3430_EN_GPIO2_MASK | OMAP3430_EN_GPIO3_MASK | OMAP3430_EN_GPIO4_MASK | OMAP3430_EN_GPIO5_MASK | OMAP3430_EN_GPIO6_MASK | OMAP3430_EN_UART3_MASK | OMAP3430_EN_MCBSP2_MASK | OMAP3430_EN_MCBSP3_MASK | OMAP3430_EN_MCBSP4_MASK, OMAP3430_PER_MOD, PM_WKEN); /* and allow them to wake up MPU */ omap2_prm_write_mod_reg(omap3630_grpsel_uart4_mask | OMAP3430_GRPSEL_GPIO2_MASK | OMAP3430_GRPSEL_GPIO3_MASK | OMAP3430_GRPSEL_GPIO4_MASK | OMAP3430_GRPSEL_GPIO5_MASK | OMAP3430_GRPSEL_GPIO6_MASK | OMAP3430_GRPSEL_UART3_MASK | OMAP3430_GRPSEL_MCBSP2_MASK | OMAP3430_GRPSEL_MCBSP3_MASK | OMAP3430_GRPSEL_MCBSP4_MASK, OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL); /* Don't attach IVA interrupts */ omap2_prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL); omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1); omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3); omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD, OMAP3430_PM_IVAGRPSEL); /* Clear any pending 'reset' flags */ omap2_prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST); omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST); omap2_prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST); omap2_prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST); omap2_prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST); omap2_prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST); omap2_prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, OMAP2_RM_RSTST); /* Clear any pending PRCM interrupts */ omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); omap3_iva_idle(); omap3_d2d_idle(); } void omap3_pm_off_mode_enable(int enable) { struct power_state *pwrst; u32 state; if (enable) state = PWRDM_POWER_OFF; else state = PWRDM_POWER_RET; list_for_each_entry(pwrst, &pwrst_list, node) { if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) && pwrst->pwrdm == core_pwrdm && state == PWRDM_POWER_OFF) { pwrst->next_state = PWRDM_POWER_RET; pr_warn("%s: Core OFF disabled due to errata i583\n", __func__); } else { pwrst->next_state = state; } omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state); } } int omap3_pm_get_suspend_state(struct powerdomain *pwrdm) { struct power_state *pwrst; list_for_each_entry(pwrst, &pwrst_list, node) { if (pwrst->pwrdm == pwrdm) return pwrst->next_state; } return -EINVAL; } int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state) { struct power_state *pwrst; list_for_each_entry(pwrst, &pwrst_list, node) { if (pwrst->pwrdm == pwrdm) { pwrst->next_state = state; return 0; } } return -EINVAL; } static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused) { struct power_state *pwrst; if (!pwrdm->pwrsts) return 0; pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC); if (!pwrst) return -ENOMEM; pwrst->pwrdm = pwrdm; pwrst->next_state = PWRDM_POWER_RET; list_add(&pwrst->node, &pwrst_list); if (pwrdm_has_hdwr_sar(pwrdm)) pwrdm_enable_hdwr_sar(pwrdm); return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state); } /* * Enable hw supervised mode for all clockdomains if it's * supported. Initiate sleep transition for other clockdomains, if * they are not used */ static int __init clkdms_setup(struct clockdomain *clkdm, void *unused) { if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO) clkdm_allow_idle(clkdm); else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP && atomic_read(&clkdm->usecount) == 0) clkdm_sleep(clkdm); return 0; } /* * Push functions to SRAM * * The minimum set of functions is pushed to SRAM for execution: * - omap3_do_wfi for erratum i581 WA, * - save_secure_ram_context for security extensions. */ void omap_push_sram_idle(void) { omap3_do_wfi_sram = omap_sram_push(omap3_do_wfi, omap3_do_wfi_sz); if (omap_type() != OMAP2_DEVICE_TYPE_GP) _omap_save_secure_sram = omap_sram_push(save_secure_ram_context, save_secure_ram_context_sz); } static void __init pm_errata_configure(void) { if (cpu_is_omap3630()) { pm34xx_errata |= PM_RTA_ERRATUM_i608; /* Enable the l2 cache toggling in sleep logic */ enable_omap3630_toggle_l2_on_restore(); if (omap_rev() < OMAP3630_REV_ES1_2) pm34xx_errata |= PM_SDRC_WAKEUP_ERRATUM_i583; } } static int __init omap3_pm_init(void) { struct power_state *pwrst, *tmp; struct clockdomain *neon_clkdm, *per_clkdm, *mpu_clkdm, *core_clkdm; int ret; if (!cpu_is_omap34xx() || cpu_is_am33xx()) return -ENODEV; if (!omap3_has_io_chain_ctrl()) pr_warning("PM: no software I/O chain control; some wakeups may be lost\n"); pm_errata_configure(); /* XXX prcm_setup_regs needs to be before enabling hw * supervised mode for powerdomains */ prcm_setup_regs(); ret = request_irq(omap_prcm_event_to_irq("wkup"), _prcm_int_handle_wakeup, IRQF_NO_SUSPEND, "pm_wkup", NULL); if (ret) { pr_err("pm: Failed to request pm_wkup irq\n"); goto err1; } /* IO interrupt is shared with mux code */ ret = request_irq(omap_prcm_event_to_irq("io"), _prcm_int_handle_io, IRQF_SHARED | IRQF_NO_SUSPEND, "pm_io", omap3_pm_init); if (ret) { pr_err("pm: Failed to request pm_io irq\n"); goto err1; } ret = pwrdm_for_each(pwrdms_setup, NULL); if (ret) { printk(KERN_ERR "Failed to setup powerdomains\n"); goto err2; } (void) clkdm_for_each(clkdms_setup, NULL); mpu_pwrdm = pwrdm_lookup("mpu_pwrdm"); if (mpu_pwrdm == NULL) { printk(KERN_ERR "Failed to get mpu_pwrdm\n"); goto err2; } neon_pwrdm = pwrdm_lookup("neon_pwrdm"); per_pwrdm = pwrdm_lookup("per_pwrdm"); core_pwrdm = pwrdm_lookup("core_pwrdm"); cam_pwrdm = pwrdm_lookup("cam_pwrdm"); neon_clkdm = clkdm_lookup("neon_clkdm"); mpu_clkdm = clkdm_lookup("mpu_clkdm"); per_clkdm = clkdm_lookup("per_clkdm"); core_clkdm = clkdm_lookup("core_clkdm"); #ifdef CONFIG_SUSPEND suspend_set_ops(&omap_pm_ops); #endif /* CONFIG_SUSPEND */ pm_idle = omap3_pm_idle; omap3_idle_init(); /* * RTA is disabled during initialization as per erratum i608 * it is safer to disable RTA by the bootloader, but we would like * to be doubly sure here and prevent any mishaps. */ if (IS_PM34XX_ERRATUM(PM_RTA_ERRATUM_i608)) omap3630_ctrl_disable_rta(); clkdm_add_wkdep(neon_clkdm, mpu_clkdm); if (omap_type() != OMAP2_DEVICE_TYPE_GP) { omap3_secure_ram_storage = kmalloc(0x803F, GFP_KERNEL); if (!omap3_secure_ram_storage) printk(KERN_ERR "Memory allocation failed when" "allocating for secure sram context\n"); local_irq_disable(); local_fiq_disable(); omap_dma_global_context_save(); omap3_save_secure_ram_context(); omap_dma_global_context_restore(); local_irq_enable(); local_fiq_enable(); } omap3_save_scratchpad_contents(); err1: return ret; err2: free_irq(INT_34XX_PRCM_MPU_IRQ, NULL); list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) { list_del(&pwrst->node); kfree(pwrst); } return ret; } late_initcall(omap3_pm_init);