arch/arm/mach-omap2/prm2xxx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * OMAP2xxx PRM module functions
   4  *
   5  * Copyright (C) 2010-2012 Texas Instruments, Inc.
   6  * Copyright (C) 2010 Nokia Corporation
   7  * Benoît Cousson
   8  * Paul Walmsley
   9  * Rajendra Nayak <rnayak@ti.com>
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/err.h>
  15 #include <linux/io.h>
  16 #include <linux/irq.h>
  17
  18 #include "powerdomain.h"
  19 #include "clockdomain.h"
  20 #include "prm2xxx.h"
  21 #include "cm2xxx_3xxx.h"
  22 #include "prm-regbits-24xx.h"
  23
  24 /*
  25  * OMAP24xx PM_PWSTCTRL_*.POWERSTATE and PM_PWSTST_*.LASTSTATEENTERED bits -
  26  * these are reversed from the bits used on OMAP3+
  27  */
  28 #define OMAP24XX_PWRDM_POWER_ON                 0x0
  29 #define OMAP24XX_PWRDM_POWER_RET                0x1
  30 #define OMAP24XX_PWRDM_POWER_OFF                0x3
  31
  32 /*
  33  * omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
  34  *   hardware register (which are specific to the OMAP2xxx SoCs) to
  35  *   reset source ID bit shifts (which is an OMAP SoC-independent
  36  *   enumeration)
  37  */
  38 static struct prm_reset_src_map omap2xxx_prm_reset_src_map[] = {
  39         { OMAP_GLOBALCOLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
  40         { OMAP_GLOBALWARM_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
  41         { OMAP24XX_SECU_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
  42         { OMAP24XX_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  43         { OMAP24XX_SECU_WD_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
  44         { OMAP24XX_EXTWMPU_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
  45         { -1, -1 },
  46 };
  47
  48 /**
  49  * omap2xxx_prm_read_reset_sources - return the last SoC reset source
  50  *
  51  * Return a u32 representing the last reset sources of the SoC.  The
  52  * returned reset source bits are standardized across OMAP SoCs.
  53  */
  54 static u32 omap2xxx_prm_read_reset_sources(void)
  55 {
  56         struct prm_reset_src_map *p;
  57         u32 r = 0;
  58         u32 v;
  59
  60         v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
  61
  62         p = omap2xxx_prm_reset_src_map;
  63         while (p->reg_shift >= 0 && p->std_shift >= 0) {
  64                 if (v & (1 << p->reg_shift))
  65                         r |= 1 << p->std_shift;
  66                 p++;
  67         }
  68
  69         return r;
  70 }
  71
  72 /**
  73  * omap2xxx_pwrst_to_common_pwrst - convert OMAP2xxx pwrst to common pwrst
  74  * @omap2xxx_pwrst: OMAP2xxx hardware power state to convert
  75  *
  76  * Return the common power state bits corresponding to the OMAP2xxx
  77  * hardware power state bits @omap2xxx_pwrst, or -EINVAL upon error.
  78  */
  79 static int omap2xxx_pwrst_to_common_pwrst(u8 omap2xxx_pwrst)
  80 {
  81         u8 pwrst;
  82
  83         switch (omap2xxx_pwrst) {
  84         case OMAP24XX_PWRDM_POWER_OFF:
  85                 pwrst = PWRDM_POWER_OFF;
  86                 break;
  87         case OMAP24XX_PWRDM_POWER_RET:
  88                 pwrst = PWRDM_POWER_RET;
  89                 break;
  90         case OMAP24XX_PWRDM_POWER_ON:
  91                 pwrst = PWRDM_POWER_ON;
  92                 break;
  93         default:
  94                 return -EINVAL;
  95         }
  96
  97         return pwrst;
  98 }
  99
 100 /**
 101  * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
 102  *
 103  * Set the DPLL reset bit, which should reboot the SoC.  This is the
 104  * recommended way to restart the SoC.  No return value.
 105  */
 106 static void omap2xxx_prm_dpll_reset(void)
 107 {
 108         omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
 109                                    OMAP2_RM_RSTCTRL);
 110         /* OCP barrier */
 111         omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL);
 112 }
 113
 114 /**
 115  * omap2xxx_prm_clear_mod_irqs - clear wakeup status bits for a module
 116  * @module: PRM module to clear wakeups from
 117  * @regs: register offset to clear
 118  * @wkst_mask: wakeup status mask to clear
 119  *
 120  * Clears wakeup status bits for a given module, so that the device can
 121  * re-enter idle.
 122  */
 123 static int omap2xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 wkst_mask)
 124 {
 125         u32 wkst;
 126
 127         wkst = omap2_prm_read_mod_reg(module, regs);
 128         wkst &= wkst_mask;
 129         omap2_prm_write_mod_reg(wkst, module, regs);
 130         return 0;
 131 }
 132
 133 int omap2xxx_clkdm_sleep(struct clockdomain *clkdm)
 134 {
 135         omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
 136                                    clkdm->pwrdm.ptr->prcm_offs,
 137                                    OMAP2_PM_PWSTCTRL);
 138         return 0;
 139 }
 140
 141 int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm)
 142 {
 143         omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
 144                                      clkdm->pwrdm.ptr->prcm_offs,
 145                                      OMAP2_PM_PWSTCTRL);
 146         return 0;
 147 }
 148
 149 static int omap2xxx_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
 150 {
 151         u8 omap24xx_pwrst;
 152
 153         switch (pwrst) {
 154         case PWRDM_POWER_OFF:
 155                 omap24xx_pwrst = OMAP24XX_PWRDM_POWER_OFF;
 156                 break;
 157         case PWRDM_POWER_RET:
 158                 omap24xx_pwrst = OMAP24XX_PWRDM_POWER_RET;
 159                 break;
 160         case PWRDM_POWER_ON:
 161                 omap24xx_pwrst = OMAP24XX_PWRDM_POWER_ON;
 162                 break;
 163         default:
 164                 return -EINVAL;
 165         }
 166
 167         omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
 168                                    (omap24xx_pwrst << OMAP_POWERSTATE_SHIFT),
 169                                    pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
 170         return 0;
 171 }
 172
 173 static int omap2xxx_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
 174 {
 175         u8 omap2xxx_pwrst;
 176
 177         omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 178                                                        OMAP2_PM_PWSTCTRL,
 179                                                        OMAP_POWERSTATE_MASK);
 180
 181         return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
 182 }
 183
 184 static int omap2xxx_pwrdm_read_pwrst(struct powerdomain *pwrdm)
 185 {
 186         u8 omap2xxx_pwrst;
 187
 188         omap2xxx_pwrst = omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
 189                                                        OMAP2_PM_PWSTST,
 190                                                        OMAP_POWERSTATEST_MASK);
 191
 192         return omap2xxx_pwrst_to_common_pwrst(omap2xxx_pwrst);
 193 }
 194
 195 struct pwrdm_ops omap2_pwrdm_operations = {
 196         .pwrdm_set_next_pwrst   = omap2xxx_pwrdm_set_next_pwrst,
 197         .pwrdm_read_next_pwrst  = omap2xxx_pwrdm_read_next_pwrst,
 198         .pwrdm_read_pwrst       = omap2xxx_pwrdm_read_pwrst,
 199         .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
 200         .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
 201         .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
 202         .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
 203         .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
 204         .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
 205 };
 206
 207 /*
 208  *
 209  */
 210
 211 static struct prm_ll_data omap2xxx_prm_ll_data = {
 212         .read_reset_sources = &omap2xxx_prm_read_reset_sources,
 213         .assert_hardreset = &omap2_prm_assert_hardreset,
 214         .deassert_hardreset = &omap2_prm_deassert_hardreset,
 215         .is_hardreset_asserted = &omap2_prm_is_hardreset_asserted,
 216         .reset_system = &omap2xxx_prm_dpll_reset,
 217         .clear_mod_irqs = &omap2xxx_prm_clear_mod_irqs,
 218 };
 219
 220 int __init omap2xxx_prm_init(const struct omap_prcm_init_data *data)
 221 {
 222         return prm_register(&omap2xxx_prm_ll_data);
 223 }
 224
 225 static void __exit omap2xxx_prm_exit(void)
 226 {
 227         prm_unregister(&omap2xxx_prm_ll_data);
 228 }
 229 __exitcall(omap2xxx_prm_exit);