arch/arm/mach-imx/anatop.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
   4  * Copyright 2017-2018 NXP.
   5  */
   6
   7 #include <linux/err.h>
   8 #include <linux/io.h>
   9 #include <linux/of.h>
  10 #include <linux/of_address.h>
  11 #include <linux/mfd/syscon.h>
  12 #include <linux/regmap.h>
  13 #include "common.h"
  14 #include "hardware.h"
  15
  16 #define REG_SET         0x4
  17 #define REG_CLR         0x8
  18
  19 #define ANADIG_REG_2P5          0x130
  20 #define ANADIG_REG_CORE         0x140
  21 #define ANADIG_ANA_MISC0        0x150
  22 #define ANADIG_DIGPROG          0x260
  23 #define ANADIG_DIGPROG_IMX6SL   0x280
  24 #define ANADIG_DIGPROG_IMX7D    0x800
  25
  26 #define SRC_SBMR2               0x1c
  27
  28 #define BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG    0x40000
  29 #define BM_ANADIG_REG_2P5_ENABLE_PULLDOWN       0x8
  30 #define BM_ANADIG_REG_CORE_FET_ODRIVE           0x20000000
  31 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG    0x1000
  32 /* Below MISC0_DISCON_HIGH_SNVS is only for i.MX6SL */
  33 #define BM_ANADIG_ANA_MISC0_DISCON_HIGH_SNVS    0x2000
  34
  35 static struct regmap *anatop;
  36
  37 static void imx_anatop_enable_weak2p5(bool enable)
  38 {
  39         u32 reg, val;
  40
  41         regmap_read(anatop, ANADIG_ANA_MISC0, &val);
  42
  43         /* can only be enabled when stop_mode_config is clear. */
  44         reg = ANADIG_REG_2P5;
  45         reg += (enable && (val & BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG) == 0) ?
  46                 REG_SET : REG_CLR;
  47         regmap_write(anatop, reg, BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG);
  48 }
  49
  50 static void imx_anatop_enable_fet_odrive(bool enable)
  51 {
  52         regmap_write(anatop, ANADIG_REG_CORE + (enable ? REG_SET : REG_CLR),
  53                 BM_ANADIG_REG_CORE_FET_ODRIVE);
  54 }
  55
  56 static inline void imx_anatop_enable_2p5_pulldown(bool enable)
  57 {
  58         regmap_write(anatop, ANADIG_REG_2P5 + (enable ? REG_SET : REG_CLR),
  59                 BM_ANADIG_REG_2P5_ENABLE_PULLDOWN);
  60 }
  61
  62 static inline void imx_anatop_disconnect_high_snvs(bool enable)
  63 {
  64         regmap_write(anatop, ANADIG_ANA_MISC0 + (enable ? REG_SET : REG_CLR),
  65                 BM_ANADIG_ANA_MISC0_DISCON_HIGH_SNVS);
  66 }
  67
  68 void imx_anatop_pre_suspend(void)
  69 {
  70         if (imx_mmdc_get_ddr_type() == IMX_DDR_TYPE_LPDDR2)
  71                 imx_anatop_enable_2p5_pulldown(true);
  72         else
  73                 imx_anatop_enable_weak2p5(true);
  74
  75         imx_anatop_enable_fet_odrive(true);
  76
  77         if (cpu_is_imx6sl())
  78                 imx_anatop_disconnect_high_snvs(true);
  79 }
  80
  81 void imx_anatop_post_resume(void)
  82 {
  83         if (imx_mmdc_get_ddr_type() == IMX_DDR_TYPE_LPDDR2)
  84                 imx_anatop_enable_2p5_pulldown(false);
  85         else
  86                 imx_anatop_enable_weak2p5(false);
  87
  88         imx_anatop_enable_fet_odrive(false);
  89
  90         if (cpu_is_imx6sl())
  91                 imx_anatop_disconnect_high_snvs(false);
  92 }
  93
  94 void __init imx_init_revision_from_anatop(void)
  95 {
  96         struct device_node *np, *src_np;
  97         void __iomem *anatop_base;
  98         unsigned int revision;
  99         u32 digprog;
 100         u16 offset = ANADIG_DIGPROG;
 101         u8 major_part, minor_part;
 102
 103         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
 104         anatop_base = of_iomap(np, 0);
 105         WARN_ON(!anatop_base);
 106         if (of_device_is_compatible(np, "fsl,imx6sl-anatop"))
 107                 offset = ANADIG_DIGPROG_IMX6SL;
 108         if (of_device_is_compatible(np, "fsl,imx7d-anatop"))
 109                 offset = ANADIG_DIGPROG_IMX7D;
 110         digprog = readl_relaxed(anatop_base + offset);
 111         iounmap(anatop_base);
 112
 113         /*
 114          * On i.MX7D digprog value match linux version format, so
 115          * it needn't map again and we can use register value directly.
 116          */
 117         if (of_device_is_compatible(np, "fsl,imx7d-anatop")) {
 118                 revision = digprog & 0xff;
 119         } else {
 120                 /*
 121                  * MAJOR: [15:8], the major silicon revison;
 122                  * MINOR: [7: 0], the minor silicon revison;
 123                  *
 124                  * please refer to the i.MX RM for the detailed
 125                  * silicon revison bit define.
 126                  * format the major part and minor part to match the
 127                  * linux kernel soc version format.
 128                  */
 129                 major_part = (digprog >> 8) & 0xf;
 130                 minor_part = digprog & 0xf;
 131                 revision = ((major_part + 1) << 4) | minor_part;
 132
 133                 if ((digprog >> 16) == MXC_CPU_IMX6ULL) {
 134                         void __iomem *src_base;
 135                         u32 sbmr2;
 136
 137                         src_np = of_find_compatible_node(NULL, NULL,
 138                                                      "fsl,imx6ul-src");
 139                         src_base = of_iomap(src_np, 0);
 140                         of_node_put(src_np);
 141                         WARN_ON(!src_base);
 142                         sbmr2 = readl_relaxed(src_base + SRC_SBMR2);
 143                         iounmap(src_base);
 144
 145                         /* src_sbmr2 bit 6 is to identify if it is i.MX6ULZ */
 146                         if (sbmr2 & (1 << 6)) {
 147                                 digprog &= ~(0xff << 16);
 148                                 digprog |= (MXC_CPU_IMX6ULZ << 16);
 149                         }
 150                 }
 151         }
 152         of_node_put(np);
 153
 154         mxc_set_cpu_type(digprog >> 16 & 0xff);
 155         imx_set_soc_revision(revision);
 156 }
 157
 158 void __init imx_anatop_init(void)
 159 {
 160         anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
 161         if (IS_ERR(anatop))
 162                 pr_err("%s: failed to find imx6q-anatop regmap!\n", __func__);
 163 }