arch/arm/mach-imx/anatop.c

   1 /*
   2  * Copyright (C) 2013-2015 Freescale Semiconductor, Inc.
   3  *
   4  * The code contained herein is licensed under the GNU General Public
   5  * License. You may obtain a copy of the GNU General Public License
   6  * Version 2 or later at the following locations:
   7  *
   8  * http://www.opensource.org/licenses/gpl-license.html
   9  * http://www.gnu.org/copyleft/gpl.html
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14 #include <linux/of.h>
  15 #include <linux/of_address.h>
  16 #include <linux/mfd/syscon.h>
  17 #include <linux/regmap.h>
  18 #include "common.h"
  19 #include "hardware.h"
  20
  21 #define REG_SET         0x4
  22 #define REG_CLR         0x8
  23
  24 #define ANADIG_REG_2P5          0x130
  25 #define ANADIG_REG_CORE         0x140
  26 #define ANADIG_ANA_MISC0        0x150
  27 #define ANADIG_USB1_CHRG_DETECT 0x1b0
  28 #define ANADIG_USB2_CHRG_DETECT 0x210
  29 #define ANADIG_DIGPROG          0x260
  30 #define ANADIG_DIGPROG_IMX6SL   0x280
  31 #define ANADIG_DIGPROG_IMX7D    0x800
  32
  33 #define BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG    0x40000
  34 #define BM_ANADIG_REG_2P5_ENABLE_PULLDOWN       0x8
  35 #define BM_ANADIG_REG_CORE_FET_ODRIVE           0x20000000
  36 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG    0x1000
  37 /* Below MISC0_DISCON_HIGH_SNVS is only for i.MX6SL */
  38 #define BM_ANADIG_ANA_MISC0_DISCON_HIGH_SNVS    0x2000
  39 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B    0x80000
  40 #define BM_ANADIG_USB_CHRG_DETECT_EN_B          0x100000
  41
  42 static struct regmap *anatop;
  43
  44 static void imx_anatop_enable_weak2p5(bool enable)
  45 {
  46         u32 reg, val;
  47
  48         regmap_read(anatop, ANADIG_ANA_MISC0, &val);
  49
  50         /* can only be enabled when stop_mode_config is clear. */
  51         reg = ANADIG_REG_2P5;
  52         reg += (enable && (val & BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG) == 0) ?
  53                 REG_SET : REG_CLR;
  54         regmap_write(anatop, reg, BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG);
  55 }
  56
  57 static void imx_anatop_enable_fet_odrive(bool enable)
  58 {
  59         regmap_write(anatop, ANADIG_REG_CORE + (enable ? REG_SET : REG_CLR),
  60                 BM_ANADIG_REG_CORE_FET_ODRIVE);
  61 }
  62
  63 static inline void imx_anatop_enable_2p5_pulldown(bool enable)
  64 {
  65         regmap_write(anatop, ANADIG_REG_2P5 + (enable ? REG_SET : REG_CLR),
  66                 BM_ANADIG_REG_2P5_ENABLE_PULLDOWN);
  67 }
  68
  69 static inline void imx_anatop_disconnect_high_snvs(bool enable)
  70 {
  71         regmap_write(anatop, ANADIG_ANA_MISC0 + (enable ? REG_SET : REG_CLR),
  72                 BM_ANADIG_ANA_MISC0_DISCON_HIGH_SNVS);
  73 }
  74
  75 void imx_anatop_pre_suspend(void)
  76 {
  77         if (imx_mmdc_get_ddr_type() == IMX_DDR_TYPE_LPDDR2)
  78                 imx_anatop_enable_2p5_pulldown(true);
  79         else
  80                 imx_anatop_enable_weak2p5(true);
  81
  82         imx_anatop_enable_fet_odrive(true);
  83
  84         if (cpu_is_imx6sl())
  85                 imx_anatop_disconnect_high_snvs(true);
  86 }
  87
  88 void imx_anatop_post_resume(void)
  89 {
  90         if (imx_mmdc_get_ddr_type() == IMX_DDR_TYPE_LPDDR2)
  91                 imx_anatop_enable_2p5_pulldown(false);
  92         else
  93                 imx_anatop_enable_weak2p5(false);
  94
  95         imx_anatop_enable_fet_odrive(false);
  96
  97         if (cpu_is_imx6sl())
  98                 imx_anatop_disconnect_high_snvs(false);
  99
 100 }
 101
 102 static void imx_anatop_usb_chrg_detect_disable(void)
 103 {
 104         regmap_write(anatop, ANADIG_USB1_CHRG_DETECT,
 105                 BM_ANADIG_USB_CHRG_DETECT_EN_B
 106                 | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
 107         regmap_write(anatop, ANADIG_USB2_CHRG_DETECT,
 108                 BM_ANADIG_USB_CHRG_DETECT_EN_B |
 109                 BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
 110 }
 111
 112 void __init imx_init_revision_from_anatop(void)
 113 {
 114         struct device_node *np;
 115         void __iomem *anatop_base;
 116         unsigned int revision;
 117         u32 digprog;
 118         u16 offset = ANADIG_DIGPROG;
 119
 120         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
 121         anatop_base = of_iomap(np, 0);
 122         WARN_ON(!anatop_base);
 123         if (of_device_is_compatible(np, "fsl,imx6sl-anatop"))
 124                 offset = ANADIG_DIGPROG_IMX6SL;
 125         if (of_device_is_compatible(np, "fsl,imx7d-anatop"))
 126                 offset = ANADIG_DIGPROG_IMX7D;
 127         digprog = readl_relaxed(anatop_base + offset);
 128         iounmap(anatop_base);
 129
 130         switch (digprog & 0xff) {
 131         case 0:
 132                 /*
 133                  * For i.MX6QP, most of the code for i.MX6Q can be resued,
 134                  * so internally, we identify it as i.MX6Q Rev 2.0
 135                  */
 136                 if (digprog >> 8 & 0x01)
 137                         revision = IMX_CHIP_REVISION_2_0;
 138                 else
 139                         revision = IMX_CHIP_REVISION_1_0;
 140                 break;
 141         case 1:
 142                 revision = IMX_CHIP_REVISION_1_1;
 143                 break;
 144         case 2:
 145                 revision = IMX_CHIP_REVISION_1_2;
 146                 break;
 147         case 3:
 148                 revision = IMX_CHIP_REVISION_1_3;
 149                 break;
 150         case 4:
 151                 revision = IMX_CHIP_REVISION_1_4;
 152                 break;
 153         case 5:
 154                 /*
 155                  * i.MX6DQ TO1.5 is defined as Rev 1.3 in Data Sheet, marked
 156                  * as 'D' in Part Number last character.
 157                  */
 158                 revision = IMX_CHIP_REVISION_1_5;
 159                 break;
 160         default:
 161                 /*
 162                  * Fail back to return raw register value instead of 0xff.
 163                  * It will be easy to know version information in SOC if it
 164                  * can't be recognized by known version. And some chip's (i.MX7D)
 165                  * digprog value match linux version format, so it needn't map
 166                  * again and we can use register value directly.
 167                  */
 168                 revision = digprog & 0xff;
 169         }
 170
 171         mxc_set_cpu_type(digprog >> 16 & 0xff);
 172         imx_set_soc_revision(revision);
 173 }
 174
 175 void __init imx_anatop_init(void)
 176 {
 177         anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
 178         if (IS_ERR(anatop)) {
 179                 pr_err("%s: failed to find imx6q-anatop regmap!\n", __func__);
 180                 return;
 181         }
 182
 183         imx_anatop_usb_chrg_detect_disable();
 184 }