| /* |
| * pm.c - Common OMAP2+ power management-related code |
| * |
| * Copyright (C) 2010 Texas Instruments, Inc. |
| * Copyright (C) 2010 Nokia Corporation |
| * |
| * 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/kernel.h> |
| #include <linux/init.h> |
| #include <linux/io.h> |
| #include <linux/err.h> |
| #include <linux/opp.h> |
| |
| #include <plat/omap-pm.h> |
| #include <plat/omap_device.h> |
| #include <plat/common.h> |
| |
| #include "voltage.h" |
| #include "powerdomain.h" |
| #include "clockdomain.h" |
| #include "pm.h" |
| |
| static struct omap_device_pm_latency *pm_lats; |
| |
| static struct device *mpu_dev; |
| static struct device *iva_dev; |
| static struct device *l3_dev; |
| static struct device *dsp_dev; |
| |
| struct device *omap2_get_mpuss_device(void) |
| { |
| WARN_ON_ONCE(!mpu_dev); |
| return mpu_dev; |
| } |
| |
| struct device *omap2_get_iva_device(void) |
| { |
| WARN_ON_ONCE(!iva_dev); |
| return iva_dev; |
| } |
| |
| struct device *omap2_get_l3_device(void) |
| { |
| WARN_ON_ONCE(!l3_dev); |
| return l3_dev; |
| } |
| |
| struct device *omap4_get_dsp_device(void) |
| { |
| WARN_ON_ONCE(!dsp_dev); |
| return dsp_dev; |
| } |
| EXPORT_SYMBOL(omap4_get_dsp_device); |
| |
| /* static int _init_omap_device(struct omap_hwmod *oh, void *user) */ |
| static int _init_omap_device(char *name, struct device **new_dev) |
| { |
| struct omap_hwmod *oh; |
| struct omap_device *od; |
| |
| oh = omap_hwmod_lookup(name); |
| if (WARN(!oh, "%s: could not find omap_hwmod for %s\n", |
| __func__, name)) |
| return -ENODEV; |
| |
| od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false); |
| if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n", |
| __func__, name)) |
| return -ENODEV; |
| |
| *new_dev = &od->pdev.dev; |
| |
| return 0; |
| } |
| |
| /* |
| * Build omap_devices for processors and bus. |
| */ |
| static void omap2_init_processor_devices(void) |
| { |
| _init_omap_device("mpu", &mpu_dev); |
| if (omap3_has_iva()) |
| _init_omap_device("iva", &iva_dev); |
| |
| if (cpu_is_omap44xx()) { |
| _init_omap_device("l3_main_1", &l3_dev); |
| _init_omap_device("dsp", &dsp_dev); |
| _init_omap_device("iva", &iva_dev); |
| } else { |
| _init_omap_device("l3_main", &l3_dev); |
| } |
| } |
| |
| /* Types of sleep_switch used in omap_set_pwrdm_state */ |
| #define FORCEWAKEUP_SWITCH 0 |
| #define LOWPOWERSTATE_SWITCH 1 |
| |
| /* |
| * This sets pwrdm state (other than mpu & core. Currently only ON & |
| * RET are supported. |
| */ |
| int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state) |
| { |
| u32 cur_state; |
| int sleep_switch = -1; |
| int ret = 0; |
| int hwsup = 0; |
| |
| if (pwrdm == NULL || IS_ERR(pwrdm)) |
| return -EINVAL; |
| |
| while (!(pwrdm->pwrsts & (1 << state))) { |
| if (state == PWRDM_POWER_OFF) |
| return ret; |
| state--; |
| } |
| |
| cur_state = pwrdm_read_next_pwrst(pwrdm); |
| if (cur_state == state) |
| return ret; |
| |
| if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) { |
| if ((pwrdm_read_pwrst(pwrdm) > state) && |
| (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) { |
| sleep_switch = LOWPOWERSTATE_SWITCH; |
| } else { |
| hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]); |
| clkdm_wakeup(pwrdm->pwrdm_clkdms[0]); |
| sleep_switch = FORCEWAKEUP_SWITCH; |
| } |
| } |
| |
| ret = pwrdm_set_next_pwrst(pwrdm, state); |
| if (ret) { |
| printk(KERN_ERR "Unable to set state of powerdomain: %s\n", |
| pwrdm->name); |
| goto err; |
| } |
| |
| switch (sleep_switch) { |
| case FORCEWAKEUP_SWITCH: |
| if (hwsup) |
| clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]); |
| else |
| clkdm_sleep(pwrdm->pwrdm_clkdms[0]); |
| break; |
| case LOWPOWERSTATE_SWITCH: |
| pwrdm_set_lowpwrstchange(pwrdm); |
| break; |
| default: |
| return ret; |
| } |
| |
| pwrdm_state_switch(pwrdm); |
| err: |
| return ret; |
| } |
| |
| /* |
| * This API is to be called during init to put the various voltage |
| * domains to the voltage as per the opp table. Typically we boot up |
| * at the nominal voltage. So this function finds out the rate of |
| * the clock associated with the voltage domain, finds out the correct |
| * opp entry and puts the voltage domain to the voltage specifies |
| * in the opp entry |
| */ |
| static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name, |
| struct device *dev) |
| { |
| struct voltagedomain *voltdm; |
| struct clk *clk; |
| struct opp *opp; |
| unsigned long freq, bootup_volt; |
| |
| if (!vdd_name || !clk_name || !dev) { |
| printk(KERN_ERR "%s: Invalid parameters!\n", __func__); |
| goto exit; |
| } |
| |
| voltdm = voltdm_lookup(vdd_name); |
| if (IS_ERR(voltdm)) { |
| printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n", |
| __func__, vdd_name); |
| goto exit; |
| } |
| |
| clk = clk_get(NULL, clk_name); |
| if (IS_ERR(clk)) { |
| printk(KERN_ERR "%s: unable to get clk %s\n", |
| __func__, clk_name); |
| goto exit; |
| } |
| |
| freq = clk->rate; |
| clk_put(clk); |
| |
| opp = opp_find_freq_ceil(dev, &freq); |
| if (IS_ERR(opp)) { |
| printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n", |
| __func__, vdd_name); |
| goto exit; |
| } |
| |
| bootup_volt = opp_get_voltage(opp); |
| if (!bootup_volt) { |
| printk(KERN_ERR "%s: unable to find voltage corresponding" |
| "to the bootup OPP for vdd_%s\n", __func__, vdd_name); |
| goto exit; |
| } |
| |
| omap_voltage_scale_vdd(voltdm, bootup_volt); |
| return 0; |
| |
| exit: |
| printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n", |
| __func__, vdd_name); |
| return -EINVAL; |
| } |
| |
| static void __init omap3_init_voltages(void) |
| { |
| if (!cpu_is_omap34xx()) |
| return; |
| |
| omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev); |
| omap2_set_init_voltage("core", "l3_ick", l3_dev); |
| } |
| |
| static void __init omap4_init_voltages(void) |
| { |
| if (!cpu_is_omap44xx()) |
| return; |
| |
| omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev); |
| omap2_set_init_voltage("core", "l3_div_ck", l3_dev); |
| omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev); |
| } |
| |
| static int __init omap2_common_pm_init(void) |
| { |
| omap2_init_processor_devices(); |
| omap_pm_if_init(); |
| |
| return 0; |
| } |
| postcore_initcall(omap2_common_pm_init); |
| |
| static int __init omap2_common_pm_late_init(void) |
| { |
| /* Init the OMAP TWL parameters */ |
| omap3_twl_init(); |
| omap4_twl_init(); |
| |
| /* Init the voltage layer */ |
| omap_voltage_late_init(); |
| |
| /* Initialize the voltages */ |
| omap3_init_voltages(); |
| omap4_init_voltages(); |
| |
| /* Smartreflex device init */ |
| omap_devinit_smartreflex(); |
| |
| return 0; |
| } |
| late_initcall(omap2_common_pm_late_init); |