arch/arm/mach-omap2/prminst44xx.c

   1 /*
   2  * OMAP4 PRM 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
  13 #include <linux/kernel.h>
  14 #include <linux/types.h>
  15 #include <linux/errno.h>
  16 #include <linux/err.h>
  17 #include <linux/io.h>
  18
  19 #include "iomap.h"
  20 #include "common.h"
  21 #include "prcm-common.h"
  22 #include "prm44xx.h"
  23 #include "prm54xx.h"
  24 #include "prm7xx.h"
  25 #include "prminst44xx.h"
  26 #include "prm-regbits-44xx.h"
  27 #include "prcm44xx.h"
  28 #include "prcm43xx.h"
  29 #include "prcm_mpu44xx.h"
  30 #include "soc.h"
  31
  32 static void __iomem *_prm_bases[OMAP4_MAX_PRCM_PARTITIONS];
  33
  34 static s32 prm_dev_inst = PRM_INSTANCE_UNKNOWN;
  35
  36 /**
  37  * omap_prm_base_init - Populates the prm partitions
  38  *
  39  * Populates the base addresses of the _prm_bases
  40  * array used for read/write of prm module registers.
  41  */
  42 void omap_prm_base_init(void)
  43 {
  44         _prm_bases[OMAP4430_PRM_PARTITION] = prm_base;
  45         _prm_bases[OMAP4430_PRCM_MPU_PARTITION] = prcm_mpu_base;
  46 }
  47
  48 s32 omap4_prmst_get_prm_dev_inst(void)
  49 {
  50         return prm_dev_inst;
  51 }
  52
  53 void omap4_prminst_set_prm_dev_inst(s32 dev_inst)
  54 {
  55         prm_dev_inst = dev_inst;
  56 }
  57
  58 /* Read a register in a PRM instance */
  59 u32 omap4_prminst_read_inst_reg(u8 part, s16 inst, u16 idx)
  60 {
  61         BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
  62                part == OMAP4430_INVALID_PRCM_PARTITION ||
  63                !_prm_bases[part]);
  64         return readl_relaxed(_prm_bases[part] + inst + idx);
  65 }
  66
  67 /* Write into a register in a PRM instance */
  68 void omap4_prminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx)
  69 {
  70         BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
  71                part == OMAP4430_INVALID_PRCM_PARTITION ||
  72                !_prm_bases[part]);
  73         writel_relaxed(val, _prm_bases[part] + inst + idx);
  74 }
  75
  76 /* Read-modify-write a register in PRM. Caller must lock */
  77 u32 omap4_prminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst,
  78                                     u16 idx)
  79 {
  80         u32 v;
  81
  82         v = omap4_prminst_read_inst_reg(part, inst, idx);
  83         v &= ~mask;
  84         v |= bits;
  85         omap4_prminst_write_inst_reg(v, part, inst, idx);
  86
  87         return v;
  88 }
  89
  90 /*
  91  * Address offset (in bytes) between the reset control and the reset
  92  * status registers: 4 bytes on OMAP4
  93  */
  94 #define OMAP4_RST_CTRL_ST_OFFSET                4
  95
  96 /**
  97  * omap4_prminst_is_hardreset_asserted - read the HW reset line state of
  98  * submodules contained in the hwmod module
  99  * @rstctrl_reg: RM_RSTCTRL register address for this module
 100  * @shift: register bit shift corresponding to the reset line to check
 101  *
 102  * Returns 1 if the (sub)module hardreset line is currently asserted,
 103  * 0 if the (sub)module hardreset line is not currently asserted, or
 104  * -EINVAL upon parameter error.
 105  */
 106 int omap4_prminst_is_hardreset_asserted(u8 shift, u8 part, s16 inst,
 107                                         u16 rstctrl_offs)
 108 {
 109         u32 v;
 110
 111         v = omap4_prminst_read_inst_reg(part, inst, rstctrl_offs);
 112         v &= 1 << shift;
 113         v >>= shift;
 114
 115         return v;
 116 }
 117
 118 /**
 119  * omap4_prminst_assert_hardreset - assert the HW reset line of a submodule
 120  * @rstctrl_reg: RM_RSTCTRL register address for this module
 121  * @shift: register bit shift corresponding to the reset line to assert
 122  *
 123  * Some IPs like dsp, ipu or iva contain processors that require an HW
 124  * reset line to be asserted / deasserted in order to fully enable the
 125  * IP.  These modules may have multiple hard-reset lines that reset
 126  * different 'submodules' inside the IP block.  This function will
 127  * place the submodule into reset.  Returns 0 upon success or -EINVAL
 128  * upon an argument error.
 129  */
 130 int omap4_prminst_assert_hardreset(u8 shift, u8 part, s16 inst,
 131                                    u16 rstctrl_offs)
 132 {
 133         u32 mask = 1 << shift;
 134
 135         omap4_prminst_rmw_inst_reg_bits(mask, mask, part, inst, rstctrl_offs);
 136
 137         return 0;
 138 }
 139
 140 /**
 141  * omap4_prminst_deassert_hardreset - deassert a submodule hardreset line and
 142  * wait
 143  * @shift: register bit shift corresponding to the reset line to deassert
 144  * @st_shift: status bit offset, not used for OMAP4+
 145  * @part: PRM partition
 146  * @inst: PRM instance offset
 147  * @rstctrl_offs: reset register offset
 148  * @st_offs: reset status register offset, not used for OMAP4+
 149  *
 150  * Some IPs like dsp, ipu or iva contain processors that require an HW
 151  * reset line to be asserted / deasserted in order to fully enable the
 152  * IP.  These modules may have multiple hard-reset lines that reset
 153  * different 'submodules' inside the IP block.  This function will
 154  * take the submodule out of reset and wait until the PRCM indicates
 155  * that the reset has completed before returning.  Returns 0 upon success or
 156  * -EINVAL upon an argument error, -EEXIST if the submodule was already out
 157  * of reset, or -EBUSY if the submodule did not exit reset promptly.
 158  */
 159 int omap4_prminst_deassert_hardreset(u8 shift, u8 st_shift, u8 part, s16 inst,
 160                                      u16 rstctrl_offs, u16 st_offs)
 161 {
 162         int c;
 163         u32 mask = 1 << shift;
 164         u16 rstst_offs = rstctrl_offs + OMAP4_RST_CTRL_ST_OFFSET;
 165
 166         /* Check the current status to avoid de-asserting the line twice */
 167         if (omap4_prminst_is_hardreset_asserted(shift, part, inst,
 168                                                 rstctrl_offs) == 0)
 169                 return -EEXIST;
 170
 171         /* Clear the reset status by writing 1 to the status bit */
 172         omap4_prminst_rmw_inst_reg_bits(0xffffffff, mask, part, inst,
 173                                         rstst_offs);
 174         /* de-assert the reset control line */
 175         omap4_prminst_rmw_inst_reg_bits(mask, 0, part, inst, rstctrl_offs);
 176         /* wait the status to be set */
 177         omap_test_timeout(omap4_prminst_is_hardreset_asserted(shift, part, inst,
 178                                                               rstst_offs),
 179                           MAX_MODULE_HARDRESET_WAIT, c);
 180
 181         return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
 182 }
 183
 184
 185 void omap4_prminst_global_warm_sw_reset(void)
 186 {
 187         u32 v;
 188         s32 inst = omap4_prmst_get_prm_dev_inst();
 189
 190         if (inst == PRM_INSTANCE_UNKNOWN)
 191                 return;
 192
 193         v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, inst,
 194                                         OMAP4_PRM_RSTCTRL_OFFSET);
 195         v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK;
 196         omap4_prminst_write_inst_reg(v, OMAP4430_PRM_PARTITION,
 197                                  inst, OMAP4_PRM_RSTCTRL_OFFSET);
 198
 199         /* OCP barrier */
 200         v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
 201                                     inst, OMAP4_PRM_RSTCTRL_OFFSET);
 202 }