+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * 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
- */
-
-#include <linux/cpu_pm.h>
-#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/clk-provider.h>
-#include <linux/irq.h>
-#include <linux/time.h>
-
-#include <asm/fncpy.h>
-
-#include <asm/mach/time.h>
-#include <asm/mach/irq.h>
-#include <asm/mach-types.h>
-#include <asm/system_misc.h>
-
-#include <linux/omap-dma.h>
-
-#include "soc.h"
-#include "common.h"
-#include "clock.h"
-#include "prm2xxx.h"
-#include "prm-regbits-24xx.h"
-#include "cm2xxx.h"
-#include "cm-regbits-24xx.h"
-#include "sdrc.h"
-#include "sram.h"
-#include "pm.h"
-#include "control.h"
-#include "powerdomain.h"
-#include "clockdomain.h"
-
-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_enter_full_retention(void)
-{
- u32 l;
-
- /* 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? */
- omap_prm_clear_mod_irqs(CORE_MOD, PM_WKST1, ~0);
- omap_prm_clear_mod_irqs(CORE_MOD, OMAP24XX_PM_WKST2, ~0);
- omap_prm_clear_mod_irqs(WKUP_MOD, PM_WKST, ~0);
-
- pwrdm_set_next_pwrst(core_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);
-
- /* One last check for pending IRQs to avoid extra latency due
- * to sleeping unnecessarily. */
- if (omap_irq_pending())
- goto no_sleep;
-
- /* 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));
-
-no_sleep:
- clk_enable(osc_ck);
-
- /* clear CORE wake-up events */
- omap_prm_clear_mod_irqs(CORE_MOD, PM_WKST1, ~0);
- omap_prm_clear_mod_irqs(CORE_MOD, OMAP24XX_PM_WKST2, ~0);
-
- /* wakeup domain events - bit 1: GPT1, bit5 GPIO */
- omap_prm_clear_mod_irqs(WKUP_MOD, PM_WKST, 0x4 | 0x1);
-
- /* MPU domain wake events */
- omap_prm_clear_mod_irqs(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET, 0x1);
-
- omap_prm_clear_mod_irqs(OCP_MOD, OMAP2_PRCM_IRQSTATUS_MPU_OFFSET, 0x20);
-
- pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
- pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_ON);
-
- return 0;
-}
-
-static int sti_console_enabled;
-
-static int omap2_allow_mpu_retention(void)
-{
- if (!omap2xxx_cm_mpu_retention_allowed())
- return 0;
- if (sti_console_enabled)
- return 0;
-
- return 1;
-}
-
-static void omap2_enter_mpu_retention(void)
-{
- const int zero = 0;
-
- /* 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? */
- omap_prm_clear_mod_irqs(CORE_MOD, PM_WKST1, ~0);
- omap_prm_clear_mod_irqs(CORE_MOD, OMAP24XX_PM_WKST2, ~0);
- omap_prm_clear_mod_irqs(WKUP_MOD, PM_WKST, ~0);
-
- /* Try to enter MPU retention */
- pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_RET);
-
- } else {
- /* Block MPU retention */
- pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
- }
-
- /* WFI */
- asm("mcr p15, 0, %0, c7, c0, 4" : : "r" (zero) : "memory", "cc");
-
- pwrdm_set_next_pwrst(mpu_pwrdm, PWRDM_POWER_ON);
-}
-
-static int omap2_can_sleep(void)
-{
- if (omap2xxx_cm_fclks_active())
- return 0;
- if (__clk_is_enabled(osc_ck))
- return 0;
-
- return 1;
-}
-
-static void omap2_pm_idle(void)
-{
- int error;
-
- if (omap_irq_pending())
- return;
-
- error = cpu_cluster_pm_enter();
- if (error || !omap2_can_sleep()) {
- omap2_enter_mpu_retention();
- goto out_cpu_cluster_pm;
- }
-
- omap2_enter_full_retention();
-
-out_cpu_cluster_pm:
- cpu_cluster_pm_exit();
-}
-
-static void __init prcm_setup_regs(void)
-{
- int i, num_mem_banks;
- struct powerdomain *pwrdm;
-
- /*
- * Enable autoidle
- * XXX This should be handled by hwmod code or PRCM init code
- */
- 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);
-
- pwrdm_set_logic_retst(core_pwrdm, PWRDM_POWER_RET);
-
- pwrdm_set_logic_retst(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);
-
- pwrdm = clkdm_get_pwrdm(gfx_clkdm);
- pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_OFF);
-
- /* Enable hardware-supervised idle for all clkdms */
- clkdm_for_each(omap_pm_clkdms_setup, NULL);
- clkdm_add_wkdep(mpu_clkdm, wkup_clkdm);
-
- omap_common_suspend_init(omap2_enter_full_retention);
-
- /* 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);
-
- /* Enable SYS_CLKEN control when all domains idle */
- omap2_prm_set_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK, OMAP24XX_GR_MOD,
- OMAP2_PRCM_CLKSRC_CTRL_OFFSET);
-}
-
-int __init omap2_pm_init(void)
-{
- u32 l;
-
- 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();
-
- /*
- * 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 after the entire
- * chip enters idle.
- */
- omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
- omap24xx_cpu_suspend_sz);
-
- arm_pm_idle = omap2_pm_idle;
-
- return 0;
-}
projects / platform / kernel / linux-rpi.git / commitdiff