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 "common.h"
  22 #include <plat/cpu.h>
  23
  24 #include "vp.h"
  25 #include "powerdomain.h"
  26 #include "clockdomain.h"
  27 #include "prm2xxx.h"
  28 #include "cm2xxx_3xxx.h"
  29 #include "prm-regbits-24xx.h"
  30
  31 /*
  32  * omap2xxx_prm_reset_src_map - map from bits in the PRM_RSTST_WKUP
  33  *   hardware register (which are specific to the OMAP2xxx SoCs) to
  34  *   reset source ID bit shifts (which is an OMAP SoC-independent
  35  *   enumeration)
  36  */
  37 static struct prm_reset_src_map omap2xxx_prm_reset_src_map[] = {
  38         { OMAP_GLOBALCOLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
  39         { OMAP_GLOBALWARM_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
  40         { OMAP24XX_SECU_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
  41         { OMAP24XX_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
  42         { OMAP24XX_SECU_WD_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
  43         { OMAP24XX_EXTWMPU_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
  44         { -1, -1 },
  45 };
  46
  47 /**
  48  * omap2xxx_prm_read_reset_sources - return the last SoC reset source
  49  *
  50  * Return a u32 representing the last reset sources of the SoC.  The
  51  * returned reset source bits are standardized across OMAP SoCs.
  52  */
  53 static u32 omap2xxx_prm_read_reset_sources(void)
  54 {
  55         struct prm_reset_src_map *p;
  56         u32 r = 0;
  57         u32 v;
  58
  59         v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
  60
  61         p = omap2xxx_prm_reset_src_map;
  62         while (p->reg_shift >= 0 && p->std_shift >= 0) {
  63                 if (v & (1 << p->reg_shift))
  64                         r |= 1 << p->std_shift;
  65                 p++;
  66         }
  67
  68         return r;
  69 }
  70
  71 /**
  72  * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
  73  *
  74  * Set the DPLL reset bit, which should reboot the SoC.  This is the
  75  * recommended way to restart the SoC.  No return value.
  76  */
  77 void omap2xxx_prm_dpll_reset(void)
  78 {
  79         omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
  80                                    OMAP2_RM_RSTCTRL);
  81         /* OCP barrier */
  82         omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL);
  83 }
  84
  85 int omap2xxx_clkdm_sleep(struct clockdomain *clkdm)
  86 {
  87         omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
  88                                    clkdm->pwrdm.ptr->prcm_offs,
  89                                    OMAP2_PM_PWSTCTRL);
  90         return 0;
  91 }
  92
  93 int omap2xxx_clkdm_wakeup(struct clockdomain *clkdm)
  94 {
  95         omap2_prm_clear_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,
  96                                      clkdm->pwrdm.ptr->prcm_offs,
  97                                      OMAP2_PM_PWSTCTRL);
  98         return 0;
  99 }
 100
 101 struct pwrdm_ops omap2_pwrdm_operations = {
 102         .pwrdm_set_next_pwrst   = omap2_pwrdm_set_next_pwrst,
 103         .pwrdm_read_next_pwrst  = omap2_pwrdm_read_next_pwrst,
 104         .pwrdm_read_pwrst       = omap2_pwrdm_read_pwrst,
 105         .pwrdm_set_logic_retst  = omap2_pwrdm_set_logic_retst,
 106         .pwrdm_set_mem_onst     = omap2_pwrdm_set_mem_onst,
 107         .pwrdm_set_mem_retst    = omap2_pwrdm_set_mem_retst,
 108         .pwrdm_read_mem_pwrst   = omap2_pwrdm_read_mem_pwrst,
 109         .pwrdm_read_mem_retst   = omap2_pwrdm_read_mem_retst,
 110         .pwrdm_wait_transition  = omap2_pwrdm_wait_transition,
 111 };
 112
 113 /*
 114  *
 115  */
 116
 117 static struct prm_ll_data omap2xxx_prm_ll_data = {
 118         .read_reset_sources = &omap2xxx_prm_read_reset_sources,
 119 };
 120
 121 int __init omap2xxx_prm_init(void)
 122 {
 123         if (!cpu_is_omap24xx())
 124                 return 0;
 125
 126         return prm_register(&omap2xxx_prm_ll_data);
 127 }
 128
 129 static void __exit omap2xxx_prm_exit(void)
 130 {
 131         if (!cpu_is_omap24xx())
 132                 return;
 133
 134         /* Should never happen */
 135         WARN(prm_unregister(&omap2xxx_prm_ll_data),
 136              "%s: prm_ll_data function pointer mismatch\n", __func__);
 137 }
 138 __exitcall(omap2xxx_prm_exit);