arch/arm/mach-omap2/cminst44xx.c

   1 /*
   2  * OMAP4 CM instance functions
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Copyright (C) 2011 Texas Instruments, Inc.
   6  * Paul Walmsley
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This is needed since CM instances can be in the PRM, PRCM_MPU, CM1,
  13  * or CM2 hardware modules.  For example, the EMU_CM CM instance is in
  14  * the PRM hardware module.  What a mess...
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/err.h>
  21 #include <linux/io.h>
  22
  23 #include "iomap.h"
  24 #include "common.h"
  25 #include "cm.h"
  26 #include "cm1_44xx.h"
  27 #include "cm2_44xx.h"
  28 #include "cm44xx.h"
  29 #include "cminst44xx.h"
  30 #include "cm-regbits-34xx.h"
  31 #include "cm-regbits-44xx.h"
  32 #include "prcm44xx.h"
  33 #include "prm44xx.h"
  34 #include "prcm_mpu44xx.h"
  35 #include "prcm-common.h"
  36
  37 /*
  38  * CLKCTRL_IDLEST_*: possible values for the CM_*_CLKCTRL.IDLEST bitfield:
  39  *
  40  *   0x0 func:     Module is fully functional, including OCP
  41  *   0x1 trans:    Module is performing transition: wakeup, or sleep, or sleep
  42  *                 abortion
  43  *   0x2 idle:     Module is in Idle mode (only OCP part). It is functional if
  44  *                 using separate functional clock
  45  *   0x3 disabled: Module is disabled and cannot be accessed
  46  *
  47  */
  48 #define CLKCTRL_IDLEST_FUNCTIONAL               0x0
  49 #define CLKCTRL_IDLEST_INTRANSITION             0x1
  50 #define CLKCTRL_IDLEST_INTERFACE_IDLE           0x2
  51 #define CLKCTRL_IDLEST_DISABLED                 0x3
  52
  53 static void __iomem *_cm_bases[OMAP4_MAX_PRCM_PARTITIONS];
  54
  55 /**
  56  * omap_cm_base_init - Populates the cm partitions
  57  *
  58  * Populates the base addresses of the _cm_bases
  59  * array used for read/write of cm module registers.
  60  */
  61 void omap_cm_base_init(void)
  62 {
  63         _cm_bases[OMAP4430_PRM_PARTITION] = prm_base;
  64         _cm_bases[OMAP4430_CM1_PARTITION] = cm_base;
  65         _cm_bases[OMAP4430_CM2_PARTITION] = cm2_base;
  66         _cm_bases[OMAP4430_PRCM_MPU_PARTITION] = prcm_mpu_base;
  67 }
  68
  69 /* Private functions */
  70
  71 /**
  72  * _clkctrl_idlest - read a CM_*_CLKCTRL register; mask & shift IDLEST bitfield
  73  * @part: PRCM partition ID that the CM_CLKCTRL register exists in
  74  * @inst: CM instance register offset (*_INST macro)
  75  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
  76  * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
  77  *
  78  * Return the IDLEST bitfield of a CM_*_CLKCTRL register, shifted down to
  79  * bit 0.
  80  */
  81 static u32 _clkctrl_idlest(u8 part, u16 inst, s16 cdoffs, u16 clkctrl_offs)
  82 {
  83         u32 v = omap4_cminst_read_inst_reg(part, inst, clkctrl_offs);
  84         v &= OMAP4430_IDLEST_MASK;
  85         v >>= OMAP4430_IDLEST_SHIFT;
  86         return v;
  87 }
  88
  89 /**
  90  * _is_module_ready - can module registers be accessed without causing an abort?
  91  * @part: PRCM partition ID that the CM_CLKCTRL register exists in
  92  * @inst: CM instance register offset (*_INST macro)
  93  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
  94  * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
  95  *
  96  * Returns true if the module's CM_*_CLKCTRL.IDLEST bitfield is either
  97  * *FUNCTIONAL or *INTERFACE_IDLE; false otherwise.
  98  */
  99 static bool _is_module_ready(u8 part, u16 inst, s16 cdoffs, u16 clkctrl_offs)
 100 {
 101         u32 v;
 102
 103         v = _clkctrl_idlest(part, inst, cdoffs, clkctrl_offs);
 104
 105         return (v == CLKCTRL_IDLEST_FUNCTIONAL ||
 106                 v == CLKCTRL_IDLEST_INTERFACE_IDLE) ? true : false;
 107 }
 108
 109 /* Public functions */
 110
 111 /* Read a register in a CM instance */
 112 u32 omap4_cminst_read_inst_reg(u8 part, s16 inst, u16 idx)
 113 {
 114         BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
 115                part == OMAP4430_INVALID_PRCM_PARTITION ||
 116                !_cm_bases[part]);
 117         return __raw_readl(_cm_bases[part] + inst + idx);
 118 }
 119
 120 /* Write into a register in a CM instance */
 121 void omap4_cminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx)
 122 {
 123         BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
 124                part == OMAP4430_INVALID_PRCM_PARTITION ||
 125                !_cm_bases[part]);
 126         __raw_writel(val, _cm_bases[part] + inst + idx);
 127 }
 128
 129 /* Read-modify-write a register in CM1. Caller must lock */
 130 u32 omap4_cminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst,
 131                                    s16 idx)
 132 {
 133         u32 v;
 134
 135         v = omap4_cminst_read_inst_reg(part, inst, idx);
 136         v &= ~mask;
 137         v |= bits;
 138         omap4_cminst_write_inst_reg(v, part, inst, idx);
 139
 140         return v;
 141 }
 142
 143 u32 omap4_cminst_set_inst_reg_bits(u32 bits, u8 part, s16 inst, s16 idx)
 144 {
 145         return omap4_cminst_rmw_inst_reg_bits(bits, bits, part, inst, idx);
 146 }
 147
 148 u32 omap4_cminst_clear_inst_reg_bits(u32 bits, u8 part, s16 inst, s16 idx)
 149 {
 150         return omap4_cminst_rmw_inst_reg_bits(bits, 0x0, part, inst, idx);
 151 }
 152
 153 u32 omap4_cminst_read_inst_reg_bits(u8 part, u16 inst, s16 idx, u32 mask)
 154 {
 155         u32 v;
 156
 157         v = omap4_cminst_read_inst_reg(part, inst, idx);
 158         v &= mask;
 159         v >>= __ffs(mask);
 160
 161         return v;
 162 }
 163
 164 /*
 165  *
 166  */
 167
 168 /**
 169  * _clktrctrl_write - write @c to a CM_CLKSTCTRL.CLKTRCTRL register bitfield
 170  * @c: CLKTRCTRL register bitfield (LSB = bit 0, i.e., unshifted)
 171  * @part: PRCM partition ID that the CM_CLKSTCTRL register exists in
 172  * @inst: CM instance register offset (*_INST macro)
 173  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 174  *
 175  * @c must be the unshifted value for CLKTRCTRL - i.e., this function
 176  * will handle the shift itself.
 177  */
 178 static void _clktrctrl_write(u8 c, u8 part, s16 inst, u16 cdoffs)
 179 {
 180         u32 v;
 181
 182         v = omap4_cminst_read_inst_reg(part, inst, cdoffs + OMAP4_CM_CLKSTCTRL);
 183         v &= ~OMAP4430_CLKTRCTRL_MASK;
 184         v |= c << OMAP4430_CLKTRCTRL_SHIFT;
 185         omap4_cminst_write_inst_reg(v, part, inst, cdoffs + OMAP4_CM_CLKSTCTRL);
 186 }
 187
 188 /**
 189  * omap4_cminst_is_clkdm_in_hwsup - is a clockdomain in hwsup idle mode?
 190  * @part: PRCM partition ID that the CM_CLKSTCTRL register exists in
 191  * @inst: CM instance register offset (*_INST macro)
 192  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 193  *
 194  * Returns true if the clockdomain referred to by (@part, @inst, @cdoffs)
 195  * is in hardware-supervised idle mode, or 0 otherwise.
 196  */
 197 bool omap4_cminst_is_clkdm_in_hwsup(u8 part, s16 inst, u16 cdoffs)
 198 {
 199         u32 v;
 200
 201         v = omap4_cminst_read_inst_reg(part, inst, cdoffs + OMAP4_CM_CLKSTCTRL);
 202         v &= OMAP4430_CLKTRCTRL_MASK;
 203         v >>= OMAP4430_CLKTRCTRL_SHIFT;
 204
 205         return (v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ? true : false;
 206 }
 207
 208 /**
 209  * omap4_cminst_clkdm_enable_hwsup - put a clockdomain in hwsup-idle mode
 210  * @part: PRCM partition ID that the clockdomain registers exist in
 211  * @inst: CM instance register offset (*_INST macro)
 212  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 213  *
 214  * Put a clockdomain referred to by (@part, @inst, @cdoffs) into
 215  * hardware-supervised idle mode.  No return value.
 216  */
 217 void omap4_cminst_clkdm_enable_hwsup(u8 part, s16 inst, u16 cdoffs)
 218 {
 219         _clktrctrl_write(OMAP34XX_CLKSTCTRL_ENABLE_AUTO, part, inst, cdoffs);
 220 }
 221
 222 /**
 223  * omap4_cminst_clkdm_disable_hwsup - put a clockdomain in swsup-idle mode
 224  * @part: PRCM partition ID that the clockdomain registers exist in
 225  * @inst: CM instance register offset (*_INST macro)
 226  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 227  *
 228  * Put a clockdomain referred to by (@part, @inst, @cdoffs) into
 229  * software-supervised idle mode, i.e., controlled manually by the
 230  * Linux OMAP clockdomain code.  No return value.
 231  */
 232 void omap4_cminst_clkdm_disable_hwsup(u8 part, s16 inst, u16 cdoffs)
 233 {
 234         _clktrctrl_write(OMAP34XX_CLKSTCTRL_DISABLE_AUTO, part, inst, cdoffs);
 235 }
 236
 237 /**
 238  * omap4_cminst_clkdm_force_sleep - try to take a clockdomain out of idle
 239  * @part: PRCM partition ID that the clockdomain registers exist in
 240  * @inst: CM instance register offset (*_INST macro)
 241  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 242  *
 243  * Take a clockdomain referred to by (@part, @inst, @cdoffs) out of idle,
 244  * waking it up.  No return value.
 245  */
 246 void omap4_cminst_clkdm_force_wakeup(u8 part, s16 inst, u16 cdoffs)
 247 {
 248         _clktrctrl_write(OMAP34XX_CLKSTCTRL_FORCE_WAKEUP, part, inst, cdoffs);
 249 }
 250
 251 /*
 252  *
 253  */
 254
 255 /**
 256  * omap4_cminst_wait_module_ready - wait for a module to be in 'func' state
 257  * @part: PRCM partition ID that the CM_CLKCTRL register exists in
 258  * @inst: CM instance register offset (*_INST macro)
 259  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 260  * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 261  *
 262  * Wait for the module IDLEST to be functional. If the idle state is in any
 263  * the non functional state (trans, idle or disabled), module and thus the
 264  * sysconfig cannot be accessed and will probably lead to an "imprecise
 265  * external abort"
 266  */
 267 int omap4_cminst_wait_module_ready(u8 part, u16 inst, s16 cdoffs,
 268                                    u16 clkctrl_offs)
 269 {
 270         int i = 0;
 271
 272         if (!clkctrl_offs)
 273                 return 0;
 274
 275         omap_test_timeout(_is_module_ready(part, inst, cdoffs, clkctrl_offs),
 276                           MAX_MODULE_READY_TIME, i);
 277
 278         return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
 279 }
 280
 281 /**
 282  * omap4_cminst_wait_module_idle - wait for a module to be in 'disabled'
 283  * state
 284  * @part: PRCM partition ID that the CM_CLKCTRL register exists in
 285  * @inst: CM instance register offset (*_INST macro)
 286  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 287  * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 288  *
 289  * Wait for the module IDLEST to be disabled. Some PRCM transition,
 290  * like reset assertion or parent clock de-activation must wait the
 291  * module to be fully disabled.
 292  */
 293 int omap4_cminst_wait_module_idle(u8 part, u16 inst, s16 cdoffs, u16 clkctrl_offs)
 294 {
 295         int i = 0;
 296
 297         if (!clkctrl_offs)
 298                 return 0;
 299
 300         omap_test_timeout((_clkctrl_idlest(part, inst, cdoffs, clkctrl_offs) ==
 301                            CLKCTRL_IDLEST_DISABLED),
 302                           MAX_MODULE_DISABLE_TIME, i);
 303
 304         return (i < MAX_MODULE_DISABLE_TIME) ? 0 : -EBUSY;
 305 }
 306
 307 /**
 308  * omap4_cminst_module_enable - Enable the modulemode inside CLKCTRL
 309  * @mode: Module mode (SW or HW)
 310  * @part: PRCM partition ID that the CM_CLKCTRL register exists in
 311  * @inst: CM instance register offset (*_INST macro)
 312  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 313  * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 314  *
 315  * No return value.
 316  */
 317 void omap4_cminst_module_enable(u8 mode, u8 part, u16 inst, s16 cdoffs,
 318                             u16 clkctrl_offs)
 319 {
 320         u32 v;
 321
 322         v = omap4_cminst_read_inst_reg(part, inst, clkctrl_offs);
 323         v &= ~OMAP4430_MODULEMODE_MASK;
 324         v |= mode << OMAP4430_MODULEMODE_SHIFT;
 325         omap4_cminst_write_inst_reg(v, part, inst, clkctrl_offs);
 326 }
 327
 328 /**
 329  * omap4_cminst_module_disable - Disable the module inside CLKCTRL
 330  * @part: PRCM partition ID that the CM_CLKCTRL register exists in
 331  * @inst: CM instance register offset (*_INST macro)
 332  * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
 333  * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
 334  *
 335  * No return value.
 336  */
 337 void omap4_cminst_module_disable(u8 part, u16 inst, s16 cdoffs,
 338                              u16 clkctrl_offs)
 339 {
 340         u32 v;
 341
 342         v = omap4_cminst_read_inst_reg(part, inst, clkctrl_offs);
 343         v &= ~OMAP4430_MODULEMODE_MASK;
 344         omap4_cminst_write_inst_reg(v, part, inst, clkctrl_offs);
 345 }