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 #include <linux/opp.h> 17 18 #include <plat/omap-pm.h> 19 #include <plat/omap_device.h> 20 #include <plat/common.h> 21 22 #include "voltage.h" 23 #include "powerdomain.h" 24 #include "clockdomain.h" 25 #include "pm.h" 26 27 static struct omap_device_pm_latency *pm_lats; 28 29 static struct device *mpu_dev; 30 static struct device *iva_dev; 31 static struct device *l3_dev; 32 static struct device *dsp_dev; 33 34 struct device *omap2_get_mpuss_device(void) 35 { 36 WARN_ON_ONCE(!mpu_dev); 37 return mpu_dev; 38 } 39 40 struct device *omap2_get_iva_device(void) 41 { 42 WARN_ON_ONCE(!iva_dev); 43 return iva_dev; 44 } 45 46 struct device *omap2_get_l3_device(void) 47 { 48 WARN_ON_ONCE(!l3_dev); 49 return l3_dev; 50 } 51 52 struct device *omap4_get_dsp_device(void) 53 { 54 WARN_ON_ONCE(!dsp_dev); 55 return dsp_dev; 56 } 57 EXPORT_SYMBOL(omap4_get_dsp_device); 58 59 /* static int _init_omap_device(struct omap_hwmod *oh, void *user) */ 60 static int _init_omap_device(char *name, struct device **new_dev) 61 { 62 struct omap_hwmod *oh; 63 struct omap_device *od; 64 65 oh = omap_hwmod_lookup(name); 66 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n", 67 __func__, name)) 68 return -ENODEV; 69 70 od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false); 71 if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n", 72 __func__, name)) 73 return -ENODEV; 74 75 *new_dev = &od->pdev.dev; 76 77 return 0; 78 } 79 80 /* 81 * Build omap_devices for processors and bus. 82 */ 83 static void omap2_init_processor_devices(void) 84 { 85 _init_omap_device("mpu", &mpu_dev); 86 if (omap3_has_iva()) 87 _init_omap_device("iva", &iva_dev); 88 89 if (cpu_is_omap44xx()) { 90 _init_omap_device("l3_main_1", &l3_dev); 91 _init_omap_device("dsp", &dsp_dev); 92 _init_omap_device("iva", &iva_dev); 93 } else { 94 _init_omap_device("l3_main", &l3_dev); 95 } 96 } 97 98 /* Types of sleep_switch used in omap_set_pwrdm_state */ 99 #define FORCEWAKEUP_SWITCH 0 100 #define LOWPOWERSTATE_SWITCH 1 101 102 /* 103 * This sets pwrdm state (other than mpu & core. Currently only ON & 104 * RET are supported. 105 */ 106 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state) 107 { 108 u32 cur_state; 109 int sleep_switch = -1; 110 int ret = 0; 111 int hwsup = 0; 112 113 if (pwrdm == NULL || IS_ERR(pwrdm)) 114 return -EINVAL; 115 116 while (!(pwrdm->pwrsts & (1 << state))) { 117 if (state == PWRDM_POWER_OFF) 118 return ret; 119 state--; 120 } 121 122 cur_state = pwrdm_read_next_pwrst(pwrdm); 123 if (cur_state == state) 124 return ret; 125 126 if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) { 127 if ((pwrdm_read_pwrst(pwrdm) > state) && 128 (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) { 129 sleep_switch = LOWPOWERSTATE_SWITCH; 130 } else { 131 hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]); 132 clkdm_wakeup(pwrdm->pwrdm_clkdms[0]); 133 pwrdm_wait_transition(pwrdm); 134 sleep_switch = FORCEWAKEUP_SWITCH; 135 } 136 } 137 138 ret = pwrdm_set_next_pwrst(pwrdm, state); 139 if (ret) { 140 printk(KERN_ERR "Unable to set state of powerdomain: %s\n", 141 pwrdm->name); 142 goto err; 143 } 144 145 switch (sleep_switch) { 146 case FORCEWAKEUP_SWITCH: 147 if (hwsup) 148 clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]); 149 else 150 clkdm_sleep(pwrdm->pwrdm_clkdms[0]); 151 break; 152 case LOWPOWERSTATE_SWITCH: 153 pwrdm_set_lowpwrstchange(pwrdm); 154 break; 155 default: 156 return ret; 157 } 158 159 pwrdm_wait_transition(pwrdm); 160 pwrdm_state_switch(pwrdm); 161 err: 162 return ret; 163 } 164 165 /* 166 * This API is to be called during init to put the various voltage 167 * domains to the voltage as per the opp table. Typically we boot up 168 * at the nominal voltage. So this function finds out the rate of 169 * the clock associated with the voltage domain, finds out the correct 170 * opp entry and puts the voltage domain to the voltage specifies 171 * in the opp entry 172 */ 173 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name, 174 struct device *dev) 175 { 176 struct voltagedomain *voltdm; 177 struct clk *clk; 178 struct opp *opp; 179 unsigned long freq, bootup_volt; 180 181 if (!vdd_name || !clk_name || !dev) { 182 printk(KERN_ERR "%s: Invalid parameters!\n", __func__); 183 goto exit; 184 } 185 186 voltdm = omap_voltage_domain_lookup(vdd_name); 187 if (IS_ERR(voltdm)) { 188 printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n", 189 __func__, vdd_name); 190 goto exit; 191 } 192 193 clk = clk_get(NULL, clk_name); 194 if (IS_ERR(clk)) { 195 printk(KERN_ERR "%s: unable to get clk %s\n", 196 __func__, clk_name); 197 goto exit; 198 } 199 200 freq = clk->rate; 201 clk_put(clk); 202 203 opp = opp_find_freq_ceil(dev, &freq); 204 if (IS_ERR(opp)) { 205 printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n", 206 __func__, vdd_name); 207 goto exit; 208 } 209 210 bootup_volt = opp_get_voltage(opp); 211 if (!bootup_volt) { 212 printk(KERN_ERR "%s: unable to find voltage corresponding" 213 "to the bootup OPP for vdd_%s\n", __func__, vdd_name); 214 goto exit; 215 } 216 217 omap_voltage_scale_vdd(voltdm, bootup_volt); 218 return 0; 219 220 exit: 221 printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n", 222 __func__, vdd_name); 223 return -EINVAL; 224 } 225 226 static void __init omap3_init_voltages(void) 227 { 228 if (!cpu_is_omap34xx()) 229 return; 230 231 omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev); 232 omap2_set_init_voltage("core", "l3_ick", l3_dev); 233 } 234 235 static void __init omap4_init_voltages(void) 236 { 237 if (!cpu_is_omap44xx()) 238 return; 239 240 omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev); 241 omap2_set_init_voltage("core", "l3_div_ck", l3_dev); 242 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev); 243 } 244 245 static int __init omap2_common_pm_init(void) 246 { 247 omap2_init_processor_devices(); 248 omap_pm_if_init(); 249 250 return 0; 251 } 252 postcore_initcall(omap2_common_pm_init); 253 254 static int __init omap2_common_pm_late_init(void) 255 { 256 /* Init the OMAP TWL parameters */ 257 omap3_twl_init(); 258 omap4_twl_init(); 259 260 /* Init the voltage layer */ 261 omap_voltage_late_init(); 262 263 /* Initialize the voltages */ 264 omap3_init_voltages(); 265 omap4_init_voltages(); 266 267 /* Smartreflex device init */ 268 omap_devinit_smartreflex(); 269 270 return 0; 271 } 272 late_initcall(omap2_common_pm_late_init); 273