/* * 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 #include #include #include "clockdomain.h" #include "powerdomain.h" #include "soc.h" #include "common.h" #include "cm3xxx.h" #include "cm-regbits-34xx.h" #include "gpmc.h" #include "prm-regbits-34xx.h" #include "prm3xxx.h" #include "pm.h" #include "sdrc.h" #include "sram.h" #include "control.h" #include "vc.h" /* 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 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 *)(unsigned long) __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) { pr_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; u32 sdrc_pwr = 0; 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 */ pr_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); pwrdm_pre_transition(NULL); /* 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); } /* CORE */ if (core_next_state < PWRDM_POWER_ON) { if (core_next_state == PWRDM_POWER_OFF) { omap3_core_save_context(); omap3_cm_save_context(); } } /* Configure PMIC signaling for I2C4 or sys_off_mode */ omap3_vc_set_pmic_signaling(core_next_state); 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(); } } omap3_intc_resume_idle(); pwrdm_post_transition(NULL); /* PER */ if (per_next_state < PWRDM_POWER_ON) omap2_gpio_resume_after_idle(); } static void omap3_pm_idle(void) { if (omap_irq_pending()) return; trace_cpu_idle(1, smp_processor_id()); omap_sram_idle(); trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id()); } #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) { pr_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) pr_err("Could not enter target state in pm_suspend\n"); else pr_info("Successfully put all powerdomains to target state\n"); return ret; } #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' */ omap3_ctrl_set_iva_bootmode_idle(); /* 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 */ 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 */ if (omap3_has_iva()) { 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); /* * We need to idle iva2_pwrdm even on am3703 with no iva2. */ 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); } /* * 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 | PM_PER_MEMORIES_ERRATUM_i582); } else if (cpu_is_omap34xx()) { pm34xx_errata |= PM_PER_MEMORIES_ERRATUM_i582; } } int __init omap3_pm_init(void) { struct power_state *pwrst, *tmp; struct clockdomain *neon_clkdm, *mpu_clkdm, *per_clkdm, *wkup_clkdm; int ret; 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); enable_irq(omap_prcm_event_to_irq("io")); if (ret) { pr_err("pm: Failed to request pm_io irq\n"); goto err2; } ret = pwrdm_for_each(pwrdms_setup, NULL); if (ret) { pr_err("Failed to setup powerdomains\n"); goto err3; } (void) clkdm_for_each(omap_pm_clkdms_setup, NULL); mpu_pwrdm = pwrdm_lookup("mpu_pwrdm"); if (mpu_pwrdm == NULL) { pr_err("Failed to get mpu_pwrdm\n"); ret = -EINVAL; goto err3; } neon_pwrdm = pwrdm_lookup("neon_pwrdm"); per_pwrdm = pwrdm_lookup("per_pwrdm"); core_pwrdm = pwrdm_lookup("core_pwrdm"); neon_clkdm = clkdm_lookup("neon_clkdm"); mpu_clkdm = clkdm_lookup("mpu_clkdm"); per_clkdm = clkdm_lookup("per_clkdm"); wkup_clkdm = clkdm_lookup("wkup_clkdm"); #ifdef CONFIG_SUSPEND omap_pm_suspend = omap3_pm_suspend; #endif arm_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(); /* * The UART3/4 FIFO and the sidetone memory in McBSP2/3 are * not correctly reset when the PER powerdomain comes back * from OFF or OSWR when the CORE powerdomain is kept active. * See OMAP36xx Erratum i582 "PER Domain reset issue after * Domain-OFF/OSWR Wakeup". This wakeup dependency is not a * complete workaround. The kernel must also prevent the PER * powerdomain from going to OSWR/OFF while the CORE * powerdomain is not going to OSWR/OFF. And if PER last * power state was off while CORE last power state was ON, the * UART3/4 and McBSP2/3 SIDETONE devices need to run a * self-test using their loopback tests; if that fails, those * devices are unusable until the PER/CORE can complete a transition * from ON to OSWR/OFF and then back to ON. * * XXX Technically this workaround is only needed if off-mode * or OSWR is enabled. */ if (IS_PM34XX_ERRATUM(PM_PER_MEMORIES_ERRATUM_i582)) clkdm_add_wkdep(per_clkdm, wkup_clkdm); 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) pr_err("Memory allocation failed when allocating for secure sram context\n"); local_irq_disable(); omap_dma_global_context_save(); omap3_save_secure_ram_context(); omap_dma_global_context_restore(); local_irq_enable(); } omap3_save_scratchpad_contents(); return ret; err3: list_for_each_entry_safe(pwrst, tmp, &pwrst_list, node) { list_del(&pwrst->node); kfree(pwrst); } free_irq(omap_prcm_event_to_irq("io"), omap3_pm_init); err2: free_irq(omap_prcm_event_to_irq("wkup"), NULL); err1: return ret; }