arch/arm/mach-omap2/powerdomain.h

   1 /*
   2  * OMAP2/3/4 powerdomain control
   3  *
   4  * Copyright (C) 2007-2008, 2010 Texas Instruments, Inc.
   5  * Copyright (C) 2007-2011 Nokia Corporation
   6  *
   7  * Paul Walmsley
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * XXX This should be moved to the mach-omap2/ directory at the earliest
  14  * opportunity.
  15  */
  16
  17 #ifndef __ARCH_ARM_MACH_OMAP2_POWERDOMAIN_H
  18 #define __ARCH_ARM_MACH_OMAP2_POWERDOMAIN_H
  19
  20 #include <linux/types.h>
  21 #include <linux/list.h>
  22 #include <linux/spinlock.h>
  23
  24 /* Powerdomain basic power states */
  25 #define PWRDM_POWER_OFF         0x0
  26 #define PWRDM_POWER_RET         0x1
  27 #define PWRDM_POWER_INACTIVE    0x2
  28 #define PWRDM_POWER_ON          0x3
  29
  30 #define PWRDM_MAX_PWRSTS        4
  31
  32 /* Powerdomain allowable state bitfields */
  33 #define PWRSTS_ON               (1 << PWRDM_POWER_ON)
  34 #define PWRSTS_INACTIVE         (1 << PWRDM_POWER_INACTIVE)
  35 #define PWRSTS_RET              (1 << PWRDM_POWER_RET)
  36 #define PWRSTS_OFF              (1 << PWRDM_POWER_OFF)
  37
  38 #define PWRSTS_OFF_ON           (PWRSTS_OFF | PWRSTS_ON)
  39 #define PWRSTS_OFF_RET          (PWRSTS_OFF | PWRSTS_RET)
  40 #define PWRSTS_RET_ON           (PWRSTS_RET | PWRSTS_ON)
  41 #define PWRSTS_OFF_RET_ON       (PWRSTS_OFF_RET | PWRSTS_ON)
  42
  43
  44 /*
  45  * Powerdomain flags (struct powerdomain.flags)
  46  *
  47  * PWRDM_HAS_HDWR_SAR - powerdomain has hardware save-and-restore support
  48  *
  49  * PWRDM_HAS_MPU_QUIRK - MPU pwr domain has MEM bank 0 bits in MEM
  50  * bank 1 position. This is true for OMAP3430
  51  *
  52  * PWRDM_HAS_LOWPOWERSTATECHANGE - can transition from a sleep state
  53  * to a lower sleep state without waking up the powerdomain
  54  */
  55 #define PWRDM_HAS_HDWR_SAR              BIT(0)
  56 #define PWRDM_HAS_MPU_QUIRK             BIT(1)
  57 #define PWRDM_HAS_LOWPOWERSTATECHANGE   BIT(2)
  58
  59 /*
  60  * Number of memory banks that are power-controllable.  On OMAP4430, the
  61  * maximum is 5.
  62  */
  63 #define PWRDM_MAX_MEM_BANKS     5
  64
  65 /*
  66  * Maximum number of clockdomains that can be associated with a powerdomain.
  67  * PER powerdomain on AM33XX is the worst case
  68  */
  69 #define PWRDM_MAX_CLKDMS        11
  70
  71 /* XXX A completely arbitrary number. What is reasonable here? */
  72 #define PWRDM_TRANSITION_BAILOUT 100000
  73
  74 struct clockdomain;
  75 struct powerdomain;
  76 struct voltagedomain;
  77
  78 /**
  79  * struct powerdomain - OMAP powerdomain
  80  * @name: Powerdomain name
  81  * @voltdm: voltagedomain containing this powerdomain
  82  * @prcm_offs: the address offset from CM_BASE/PRM_BASE
  83  * @prcm_partition: (OMAP4 only) the PRCM partition ID containing @prcm_offs
  84  * @pwrsts: Possible powerdomain power states
  85  * @pwrsts_logic_ret: Possible logic power states when pwrdm in RETENTION
  86  * @flags: Powerdomain flags
  87  * @banks: Number of software-controllable memory banks in this powerdomain
  88  * @pwrsts_mem_ret: Possible memory bank pwrstates when pwrdm in RETENTION
  89  * @pwrsts_mem_on: Possible memory bank pwrstates when pwrdm in ON
  90  * @pwrdm_clkdms: Clockdomains in this powerdomain
  91  * @node: list_head linking all powerdomains
  92  * @voltdm_node: list_head linking all powerdomains in a voltagedomain
  93  * @pwrstctrl_offs: (AM33XX only) XXX_PWRSTCTRL reg offset from prcm_offs
  94  * @pwrstst_offs: (AM33XX only) XXX_PWRSTST reg offset from prcm_offs
  95  * @logicretstate_mask: (AM33XX only) mask for logic retention bitfield
  96  *      in @pwrstctrl_offs
  97  * @mem_on_mask: (AM33XX only) mask for mem on bitfield in @pwrstctrl_offs
  98  * @mem_ret_mask: (AM33XX only) mask for mem ret bitfield in @pwrstctrl_offs
  99  * @mem_pwrst_mask: (AM33XX only) mask for mem state bitfield in @pwrstst_offs
 100  * @mem_retst_mask: (AM33XX only) mask for mem retention state bitfield
 101  *      in @pwrstctrl_offs
 102  * @state:
 103  * @state_counter:
 104  * @timer:
 105  * @state_timer:
 106  * @_lock: spinlock used to serialize powerdomain and some clockdomain ops
 107  * @_lock_flags: stored flags when @_lock is taken
 108  *
 109  * @prcm_partition possible values are defined in mach-omap2/prcm44xx.h.
 110  */
 111 struct powerdomain {
 112         const char *name;
 113         union {
 114                 const char *name;
 115                 struct voltagedomain *ptr;
 116         } voltdm;
 117         const s16 prcm_offs;
 118         const u8 pwrsts;
 119         const u8 pwrsts_logic_ret;
 120         const u8 flags;
 121         const u8 banks;
 122         const u8 pwrsts_mem_ret[PWRDM_MAX_MEM_BANKS];
 123         const u8 pwrsts_mem_on[PWRDM_MAX_MEM_BANKS];
 124         const u8 prcm_partition;
 125         struct clockdomain *pwrdm_clkdms[PWRDM_MAX_CLKDMS];
 126         struct list_head node;
 127         struct list_head voltdm_node;
 128         int state;
 129         unsigned state_counter[PWRDM_MAX_PWRSTS];
 130         unsigned ret_logic_off_counter;
 131         unsigned ret_mem_off_counter[PWRDM_MAX_MEM_BANKS];
 132         spinlock_t _lock;
 133         unsigned long _lock_flags;
 134         const u8 pwrstctrl_offs;
 135         const u8 pwrstst_offs;
 136         const u32 logicretstate_mask;
 137         const u32 mem_on_mask[PWRDM_MAX_MEM_BANKS];
 138         const u32 mem_ret_mask[PWRDM_MAX_MEM_BANKS];
 139         const u32 mem_pwrst_mask[PWRDM_MAX_MEM_BANKS];
 140         const u32 mem_retst_mask[PWRDM_MAX_MEM_BANKS];
 141
 142 #ifdef CONFIG_PM_DEBUG
 143         s64 timer;
 144         s64 state_timer[PWRDM_MAX_PWRSTS];
 145 #endif
 146 };
 147
 148 /**
 149  * struct pwrdm_ops - Arch specific function implementations
 150  * @pwrdm_set_next_pwrst: Set the target power state for a pd
 151  * @pwrdm_read_next_pwrst: Read the target power state set for a pd
 152  * @pwrdm_read_pwrst: Read the current power state of a pd
 153  * @pwrdm_read_prev_pwrst: Read the prev power state entered by the pd
 154  * @pwrdm_set_logic_retst: Set the logic state in RET for a pd
 155  * @pwrdm_set_mem_onst: Set the Memory state in ON for a pd
 156  * @pwrdm_set_mem_retst: Set the Memory state in RET for a pd
 157  * @pwrdm_read_logic_pwrst: Read the current logic state of a pd
 158  * @pwrdm_read_prev_logic_pwrst: Read the previous logic state entered by a pd
 159  * @pwrdm_read_logic_retst: Read the logic state in RET for a pd
 160  * @pwrdm_read_mem_pwrst: Read the current memory state of a pd
 161  * @pwrdm_read_prev_mem_pwrst: Read the previous memory state entered by a pd
 162  * @pwrdm_read_mem_retst: Read the memory state in RET for a pd
 163  * @pwrdm_clear_all_prev_pwrst: Clear all previous power states logged for a pd
 164  * @pwrdm_enable_hdwr_sar: Enable Hardware Save-Restore feature for the pd
 165  * @pwrdm_disable_hdwr_sar: Disable Hardware Save-Restore feature for a pd
 166  * @pwrdm_set_lowpwrstchange: Enable pd transitions from a shallow to deep sleep
 167  * @pwrdm_wait_transition: Wait for a pd state transition to complete
 168  * @pwrdm_has_voltdm: Check if a voltdm association is needed
 169  *
 170  * Regarding @pwrdm_set_lowpwrstchange: On the OMAP2 and 3-family
 171  * chips, a powerdomain's power state is not allowed to directly
 172  * transition from one low-power state (e.g., CSWR) to another
 173  * low-power state (e.g., OFF) without first waking up the
 174  * powerdomain.  This wastes energy.  So OMAP4 chips support the
 175  * ability to transition a powerdomain power state directly from one
 176  * low-power state to another.  The function pointed to by
 177  * @pwrdm_set_lowpwrstchange is intended to configure the OMAP4
 178  * hardware powerdomain state machine to enable this feature.
 179  */
 180 struct pwrdm_ops {
 181         int     (*pwrdm_set_next_pwrst)(struct powerdomain *pwrdm, u8 pwrst);
 182         int     (*pwrdm_read_next_pwrst)(struct powerdomain *pwrdm);
 183         int     (*pwrdm_read_pwrst)(struct powerdomain *pwrdm);
 184         int     (*pwrdm_read_prev_pwrst)(struct powerdomain *pwrdm);
 185         int     (*pwrdm_set_logic_retst)(struct powerdomain *pwrdm, u8 pwrst);
 186         int     (*pwrdm_set_mem_onst)(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
 187         int     (*pwrdm_set_mem_retst)(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
 188         int     (*pwrdm_read_logic_pwrst)(struct powerdomain *pwrdm);
 189         int     (*pwrdm_read_prev_logic_pwrst)(struct powerdomain *pwrdm);
 190         int     (*pwrdm_read_logic_retst)(struct powerdomain *pwrdm);
 191         int     (*pwrdm_read_mem_pwrst)(struct powerdomain *pwrdm, u8 bank);
 192         int     (*pwrdm_read_prev_mem_pwrst)(struct powerdomain *pwrdm, u8 bank);
 193         int     (*pwrdm_read_mem_retst)(struct powerdomain *pwrdm, u8 bank);
 194         int     (*pwrdm_clear_all_prev_pwrst)(struct powerdomain *pwrdm);
 195         int     (*pwrdm_enable_hdwr_sar)(struct powerdomain *pwrdm);
 196         int     (*pwrdm_disable_hdwr_sar)(struct powerdomain *pwrdm);
 197         int     (*pwrdm_set_lowpwrstchange)(struct powerdomain *pwrdm);
 198         int     (*pwrdm_wait_transition)(struct powerdomain *pwrdm);
 199         int     (*pwrdm_has_voltdm)(void);
 200 };
 201
 202 int pwrdm_register_platform_funcs(struct pwrdm_ops *custom_funcs);
 203 int pwrdm_register_pwrdms(struct powerdomain **pwrdm_list);
 204 int pwrdm_complete_init(void);
 205
 206 struct powerdomain *pwrdm_lookup(const char *name);
 207
 208 int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
 209                         void *user);
 210 int pwrdm_for_each_nolock(int (*fn)(struct powerdomain *pwrdm, void *user),
 211                         void *user);
 212
 213 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm);
 214 int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm);
 215 int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
 216                          int (*fn)(struct powerdomain *pwrdm,
 217                                    struct clockdomain *clkdm));
 218 struct voltagedomain *pwrdm_get_voltdm(struct powerdomain *pwrdm);
 219
 220 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm);
 221
 222 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst);
 223 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm);
 224 int pwrdm_read_pwrst(struct powerdomain *pwrdm);
 225 int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm);
 226 int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm);
 227
 228 int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst);
 229 int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
 230 int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
 231
 232 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm);
 233 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm);
 234 int pwrdm_read_logic_retst(struct powerdomain *pwrdm);
 235 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
 236 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
 237 int pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank);
 238
 239 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm);
 240 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm);
 241 bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm);
 242
 243 int pwrdm_state_switch_nolock(struct powerdomain *pwrdm);
 244 int pwrdm_state_switch(struct powerdomain *pwrdm);
 245 int pwrdm_pre_transition(struct powerdomain *pwrdm);
 246 int pwrdm_post_transition(struct powerdomain *pwrdm);
 247 int pwrdm_get_context_loss_count(struct powerdomain *pwrdm);
 248 bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm);
 249
 250 extern int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 state);
 251
 252 extern void omap242x_powerdomains_init(void);
 253 extern void omap243x_powerdomains_init(void);
 254 extern void omap3xxx_powerdomains_init(void);
 255 extern void am33xx_powerdomains_init(void);
 256 extern void omap44xx_powerdomains_init(void);
 257 extern void omap54xx_powerdomains_init(void);
 258 extern void dra7xx_powerdomains_init(void);
 259 void am43xx_powerdomains_init(void);
 260
 261 extern struct pwrdm_ops omap2_pwrdm_operations;
 262 extern struct pwrdm_ops omap3_pwrdm_operations;
 263 extern struct pwrdm_ops am33xx_pwrdm_operations;
 264 extern struct pwrdm_ops omap4_pwrdm_operations;
 265
 266 /* Common Internal functions used across OMAP rev's */
 267 extern u32 omap2_pwrdm_get_mem_bank_onstate_mask(u8 bank);
 268 extern u32 omap2_pwrdm_get_mem_bank_retst_mask(u8 bank);
 269 extern u32 omap2_pwrdm_get_mem_bank_stst_mask(u8 bank);
 270
 271 extern struct powerdomain wkup_omap2_pwrdm;
 272 extern struct powerdomain gfx_omap2_pwrdm;
 273
 274 extern void pwrdm_lock(struct powerdomain *pwrdm);
 275 extern void pwrdm_unlock(struct powerdomain *pwrdm);
 276
 277 #endif