1 /* 2 * pm.c - Common OMAP2+ power management-related code 3 * 4 * Copyright (C) 2010 Texas Instruments, Inc. 5 * Copyright (C) 2010 Nokia Corporation 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/init.h> 14 #include <linux/io.h> 15 #include <linux/err.h> 16 17 #include <plat/omap-pm.h> 18 #include <plat/omap_device.h> 19 #include <plat/common.h> 20 21 #include <plat/powerdomain.h> 22 #include <plat/clockdomain.h> 23 24 static struct omap_device_pm_latency *pm_lats; 25 26 static struct device *mpu_dev; 27 static struct device *iva_dev; 28 static struct device *l3_dev; 29 static struct device *dsp_dev; 30 31 struct device *omap2_get_mpuss_device(void) 32 { 33 WARN_ON_ONCE(!mpu_dev); 34 return mpu_dev; 35 } 36 37 struct device *omap2_get_iva_device(void) 38 { 39 WARN_ON_ONCE(!iva_dev); 40 return iva_dev; 41 } 42 43 struct device *omap2_get_l3_device(void) 44 { 45 WARN_ON_ONCE(!l3_dev); 46 return l3_dev; 47 } 48 49 struct device *omap4_get_dsp_device(void) 50 { 51 WARN_ON_ONCE(!dsp_dev); 52 return dsp_dev; 53 } 54 EXPORT_SYMBOL(omap4_get_dsp_device); 55 56 /* static int _init_omap_device(struct omap_hwmod *oh, void *user) */ 57 static int _init_omap_device(char *name, struct device **new_dev) 58 { 59 struct omap_hwmod *oh; 60 struct omap_device *od; 61 62 oh = omap_hwmod_lookup(name); 63 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n", 64 __func__, name)) 65 return -ENODEV; 66 67 od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false); 68 if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n", 69 __func__, name)) 70 return -ENODEV; 71 72 *new_dev = &od->pdev.dev; 73 74 return 0; 75 } 76 77 /* 78 * Build omap_devices for processors and bus. 79 */ 80 static void omap2_init_processor_devices(void) 81 { 82 _init_omap_device("mpu", &mpu_dev); 83 _init_omap_device("iva", &iva_dev); 84 if (cpu_is_omap44xx()) { 85 _init_omap_device("l3_main_1", &l3_dev); 86 _init_omap_device("dsp", &dsp_dev); 87 } else { 88 _init_omap_device("l3_main", &l3_dev); 89 } 90 } 91 92 /* 93 * This sets pwrdm state (other than mpu & core. Currently only ON & 94 * RET are supported. Function is assuming that clkdm doesn't have 95 * hw_sup mode enabled. 96 */ 97 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state) 98 { 99 u32 cur_state; 100 int sleep_switch = 0; 101 int ret = 0; 102 103 if (pwrdm == NULL || IS_ERR(pwrdm)) 104 return -EINVAL; 105 106 while (!(pwrdm->pwrsts & (1 << state))) { 107 if (state == PWRDM_POWER_OFF) 108 return ret; 109 state--; 110 } 111 112 cur_state = pwrdm_read_next_pwrst(pwrdm); 113 if (cur_state == state) 114 return ret; 115 116 if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) { 117 omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]); 118 sleep_switch = 1; 119 pwrdm_wait_transition(pwrdm); 120 } 121 122 ret = pwrdm_set_next_pwrst(pwrdm, state); 123 if (ret) { 124 printk(KERN_ERR "Unable to set state of powerdomain: %s\n", 125 pwrdm->name); 126 goto err; 127 } 128 129 if (sleep_switch) { 130 omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]); 131 pwrdm_wait_transition(pwrdm); 132 pwrdm_state_switch(pwrdm); 133 } 134 135 err: 136 return ret; 137 } 138 139 static int __init omap2_common_pm_init(void) 140 { 141 omap2_init_processor_devices(); 142 omap_pm_if_init(); 143 144 return 0; 145 } 146 device_initcall(omap2_common_pm_init); 147 148