arch/arm/mach-imx/anatop.c

   1 /*
   2  * Copyright (C) 2013 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
  32 #define BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG    0x40000
  33 #define BM_ANADIG_REG_CORE_FET_ODRIVE           0x20000000
  34 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG    0x1000
  35 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B    0x80000
  36 #define BM_ANADIG_USB_CHRG_DETECT_EN_B          0x100000
  37
  38 static struct regmap *anatop;
  39
  40 static void imx_anatop_enable_weak2p5(bool enable)
  41 {
  42         u32 reg, val;
  43
  44         regmap_read(anatop, ANADIG_ANA_MISC0, &val);
  45
  46         /* can only be enabled when stop_mode_config is clear. */
  47         reg = ANADIG_REG_2P5;
  48         reg += (enable && (val & BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG) == 0) ?
  49                 REG_SET : REG_CLR;
  50         regmap_write(anatop, reg, BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG);
  51 }
  52
  53 static void imx_anatop_enable_fet_odrive(bool enable)
  54 {
  55         regmap_write(anatop, ANADIG_REG_CORE + (enable ? REG_SET : REG_CLR),
  56                 BM_ANADIG_REG_CORE_FET_ODRIVE);
  57 }
  58
  59 void imx_anatop_pre_suspend(void)
  60 {
  61         imx_anatop_enable_weak2p5(true);
  62         imx_anatop_enable_fet_odrive(true);
  63 }
  64
  65 void imx_anatop_post_resume(void)
  66 {
  67         imx_anatop_enable_fet_odrive(false);
  68         imx_anatop_enable_weak2p5(false);
  69 }
  70
  71 static void imx_anatop_usb_chrg_detect_disable(void)
  72 {
  73         regmap_write(anatop, ANADIG_USB1_CHRG_DETECT,
  74                 BM_ANADIG_USB_CHRG_DETECT_EN_B
  75                 | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
  76         regmap_write(anatop, ANADIG_USB2_CHRG_DETECT,
  77                 BM_ANADIG_USB_CHRG_DETECT_EN_B |
  78                 BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
  79 }
  80
  81 void __init imx_init_revision_from_anatop(void)
  82 {
  83         struct device_node *np;
  84         void __iomem *anatop_base;
  85         unsigned int revision;
  86         u32 digprog;
  87         u16 offset = ANADIG_DIGPROG;
  88
  89         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
  90         anatop_base = of_iomap(np, 0);
  91         WARN_ON(!anatop_base);
  92         if (of_device_is_compatible(np, "fsl,imx6sl-anatop"))
  93                 offset = ANADIG_DIGPROG_IMX6SL;
  94         digprog = readl_relaxed(anatop_base + offset);
  95         iounmap(anatop_base);
  96
  97         switch (digprog & 0xff) {
  98         case 0:
  99                 revision = IMX_CHIP_REVISION_1_0;
 100                 break;
 101         case 1:
 102                 revision = IMX_CHIP_REVISION_1_1;
 103                 break;
 104         case 2:
 105                 revision = IMX_CHIP_REVISION_1_2;
 106                 break;
 107         default:
 108                 revision = IMX_CHIP_REVISION_UNKNOWN;
 109         }
 110
 111         mxc_set_cpu_type(digprog >> 16 & 0xff);
 112         imx_set_soc_revision(revision);
 113 }
 114
 115 void __init imx_anatop_init(void)
 116 {
 117         anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
 118         if (IS_ERR(anatop)) {
 119                 pr_err("%s: failed to find imx6q-anatop regmap!\n", __func__);
 120                 return;
 121         }
 122
 123         imx_anatop_usb_chrg_detect_disable();
 124 }