arch/arm/mach-omap2/prm2xxx.c

   1 /*
   2  * OMAP2xxx PRM module functions
   3  *
   4  * Copyright (C) 2010-2012 Texas Instruments, Inc.
   5  * Copyright (C) 2010 Nokia Corporation
   6  * Benoît Cousson
   7  * Paul Walmsley
   8  * Rajendra Nayak <rnayak@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/errno.h>
  17 #include <linux/err.h>
  18 #include <linux/io.h>
  19 #include <linux/irq.h>
  20
  21 #include "powerdomain.h"
  22 #include "clockdomain.h"
  23 #include "prm2xxx.h"
  24 #include "cm2xxx_3xxx.h"
  25 #include "prm-regbits-24xx.h"
  26
  27 /*
  28  * OMAP24xx PM_PWSTCTRL_*.POWERSTATE and PM_PWSTST_*.LASTSTATEENTERED bits -
  29  * these are reversed from the bits used on OMAP3+
  30  */
  31 #define OMAP24XX_PWRDM_POWER_ON                 0x0
  32 #define OMAP24XX_PWRDM_POWER_RET                0x1
  33 #define OMAP24XX_PWRDM_POWER_OFF                0x3
  34
  35 /*
  36  * omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
  37  *   hardware register (which are specific to the OMAP2xxx SoCs) to
  38  *   reset source ID bit shifts (which is an OMAP SoC-independent
  39  *   enumeration)
  40  */
  41 static struct prm_reset_src_map omap2xxx_prm_reset_src_map[] = {
  42         { OMAP_GLOBALCOLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
  43         { OMAP_GLOBALWARM_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
  44         { OMAP24XX_SECU_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
  45         { OMAP24XX_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  46         { OMAP24XX_SECU_WD_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
  47         { OMAP24XX_EXTWMPU_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
  48         { -1, -1 },
  49 };
  50
  51 /**
  52  * omap2xxx_prm_read_reset_sources - return the last SoC reset source
  53  *
  54  * Return a u32 representing the last reset sources of the SoC.  The
  55  * returned reset source bits are standardized across OMAP SoCs.
  56  */
  57 static u32 omap2xxx_prm_read_reset_sources(void)
  58 {
  59         struct prm_reset_src_map *p;
  60         u32 r = 0;
  61         u32 v;
  62
  63         v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
  64
  65         p = omap2xxx_prm_reset_src_map;
  66         while (p->reg_shift >= 0 && p->std_shift >= 0) {
  67                 if (v & (1 << p->reg_shift))
  68                         r |= 1 << p->std_shift;
  69                 p++;
  70         }
  71
  72         return r;
  73 }
  74
  75 /**
  76  * omap2xxx_pwrst_to_common_pwrst - convert OMAP2xxx pwrst to common pwrst
  77  * @omap2xxx_pwrst: OMAP2xxx hardware power state to convert
  78  *
  79  * Return the common power state bits corresponding to the OMAP2xxx
  80  * hardware power state bits @omap2xxx_pwrst, or -EINVAL upon error.
  81  */
  82 static int omap2xxx_pwrst_to_common_pwrst(u8 omap2xxx_pwrst)
  83 {
  84         u8 pwrst;
  85
  86         switch (omap2xxx_pwrst) {
  87         case OMAP24XX_PWRDM_POWER_OFF:
  88                 pwrst = PWRDM_POWER_OFF;
  89                 break;
  90         case OMAP24XX_PWRDM_POWER_RET:
  91                 pwrst = PWRDM_POWER_RET;
  92                 break;
  93         case OMAP24XX_PWRDM_POWER_ON:
  94                 pwrst = PWRDM_POWER_ON;
  95                 break;
  96         default:
  97                 return -EINVAL;
  98         }
  99
 100         return pwrst;
 101 }
 102
 103 /**
 104  * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
 105  *
 106  * Set the DPLL reset bit, which should reboot the SoC.  This is the
 107  * recommended way to restart the SoC.  No return value.
 108  */
 109 void omap2xxx_prm_dpll_reset(void)
 110 {
 111         omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
 112                                    OMAP2_RM_RSTCTRL);
 113         /* OCP barrier */
 114         omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL);
 115 }
 116
 117 int omap2xxx_clkdm_sleep(struct clockdomain *clkdm)
 118 {
 119         omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
 120                                    clkdm->pwrdm.ptr->prcm_offs,
 121                                    OMAP2_PM_PWSTCTRL);
 122         return 0;
 123 }
 124
 125 int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm)
 126 {
 127         omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
 128                                      clkdm->pwrdm.ptr->prcm_offs,
 129                                      OMAP2_PM_PWSTCTRL);
 130         return 0;
 131 }
 132
 133 static int omap2xxx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
 134 {
 135         u8 omap24xx_pwrst;
 136
 137         switch (pwrst) {
 138         case PWRDM_POWER_OFF:
 139                 omap24xx_pwrst = OMAP24XX_PWRDM_POWER_OFF;
 140                 break;
 141         case PWRDM_POWER_RET:
 142                 omap24xx_pwrst = OMAP24XX_PWRDM_POWER_RET;
 143                 break;
 144         case PWRDM_POWER_ON:
 145                 omap24xx_pwrst = OMAP24XX_PWRDM_POWER_ON;
 146                 break;
 147         default:
 148                 return -EINVAL;
 149         }
 150
 151         omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
 152                                    (omap24xx_pwrst << OMAP_POWERSTATE_SHIFT),
 153                                    pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
 154         return 0;
 155 }
 156
 157 static int omap2xxx_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
 158 {
 159         u8 omap2xxx_pwrst;
 160
 161         omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 162                                                        OMAP2_PM_PWSTCTRL,
 163                                                        OMAP_POWERSTATE_MASK);
 164
 165         return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
 166 }
 167
 168 static int omap2xxx_pwrdm_read_pwrst(struct powerdomain *pwrdm)
 169 {
 170         u8 omap2xxx_pwrst;
 171
 172         omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 173                                                        OMAP2_PM_PWSTST,
 174                                                        OMAP_POWERSTATEST_MASK);
 175
 176         return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
 177 }
 178
 179 struct pwrdm_ops omap2_pwrdm_operations = {
 180         .pwrdm_set_next_pwrst   = omap2xxx_pwrdm_set_next_pwrst,
 181         .pwrdm_read_next_pwrst  = omap2xxx_pwrdm_read_next_pwrst,
 182         .pwrdm_read_pwrst       = omap2xxx_pwrdm_read_pwrst,
 183         .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
 184         .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
 185         .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
 186         .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
 187         .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
 188         .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
 189 };
 190
 191 /*
 192  *
 193  */
 194
 195 static struct prm_ll_data omap2xxx_prm_ll_data = {
 196         .read_reset_sources = &omap2xxx_prm_read_reset_sources,
 197 };
 198
 199 int __init omap2xxx_prm_init(void)
 200 {
 201         return prm_register(&omap2xxx_prm_ll_data);
 202 }
 203
 204 static void __exit omap2xxx_prm_exit(void)
 205 {
 206         prm_unregister(&omap2xxx_prm_ll_data);
 207 }
 208 __exitcall(omap2xxx_prm_exit);