diff options
Diffstat (limited to 'arch/arm/mach-omap2/pm.c')
| -rw-r--r-- | arch/arm/mach-omap2/pm.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c new file mode 100644 index 000000000000..d5a102c71989 --- /dev/null +++ b/arch/arm/mach-omap2/pm.c @@ -0,0 +1,267 @@ +/* + * 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 <plat/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); + _init_omap_device("iva", &iva_dev); + if (cpu_is_omap44xx()) { + _init_omap_device("l3_main_1", &l3_dev); + _init_omap_device("dsp", &dsp_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 = 0; + int ret = 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 { + omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]); + pwrdm_wait_transition(pwrdm); + 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 (pwrdm->pwrdm_clkdms[0]->flags & CLKDM_CAN_ENABLE_AUTO) + omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]); + else + omap2_clkdm_sleep(pwrdm->pwrdm_clkdms[0]); + break; + case LOWPOWERSTATE_SWITCH: + pwrdm_set_lowpwrstchange(pwrdm); + break; + default: + return ret; + } + + pwrdm_wait_transition(pwrdm); + 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 = omap_voltage_domain_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); |