arch/arm/mach-imx/mach-imx7d.c

   1 /*
   2  * Copyright (C) 2015 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #include <linux/irqchip.h>
   9 #include <linux/mfd/syscon.h>
  10 #include <linux/mfd/syscon/imx7-iomuxc-gpr.h>
  11 #include <linux/of_platform.h>
  12 #include <linux/phy.h>
  13 #include <linux/regmap.h>
  14
  15 #include <asm/mach/arch.h>
  16 #include <asm/mach/map.h>
  17
  18 #include "common.h"
  19
  20 static int ar8031_phy_fixup(struct phy_device *dev)
  21 {
  22         u16 val;
  23
  24         /* Set RGMII IO voltage to 1.8V */
  25         phy_write(dev, 0x1d, 0x1f);
  26         phy_write(dev, 0x1e, 0x8);
  27
  28         /* disable phy AR8031 SmartEEE function. */
  29         phy_write(dev, 0xd, 0x3);
  30         phy_write(dev, 0xe, 0x805d);
  31         phy_write(dev, 0xd, 0x4003);
  32         val = phy_read(dev, 0xe);
  33         val &= ~(0x1 << 8);
  34         phy_write(dev, 0xe, val);
  35
  36         /* introduce tx clock delay */
  37         phy_write(dev, 0x1d, 0x5);
  38         val = phy_read(dev, 0x1e);
  39         val |= 0x0100;
  40         phy_write(dev, 0x1e, val);
  41
  42         return 0;
  43 }
  44
  45 static int bcm54220_phy_fixup(struct phy_device *dev)
  46 {
  47         /* enable RXC skew select RGMII copper mode */
  48         phy_write(dev, 0x1e, 0x21);
  49         phy_write(dev, 0x1f, 0x7ea8);
  50         phy_write(dev, 0x1e, 0x2f);
  51         phy_write(dev, 0x1f, 0x71b7);
  52
  53         return 0;
  54 }
  55
  56 #define PHY_ID_AR8031   0x004dd074
  57 #define PHY_ID_BCM54220 0x600d8589
  58
  59 static void __init imx7d_enet_phy_init(void)
  60 {
  61         if (IS_BUILTIN(CONFIG_PHYLIB)) {
  62                 phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
  63                                            ar8031_phy_fixup);
  64                 phy_register_fixup_for_uid(PHY_ID_BCM54220, 0xffffffff,
  65                                            bcm54220_phy_fixup);
  66         }
  67 }
  68
  69 static void __init imx7d_enet_clk_sel(void)
  70 {
  71         struct regmap *gpr;
  72
  73         gpr = syscon_regmap_lookup_by_compatible("fsl,imx7d-iomuxc-gpr");
  74         if (!IS_ERR(gpr)) {
  75                 regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_TX_CLK_SEL_MASK, 0);
  76                 regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_CLK_DIR_MASK, 0);
  77         } else {
  78                 pr_err("failed to find fsl,imx7d-iomux-gpr regmap\n");
  79         }
  80 }
  81
  82 static inline void imx7d_enet_init(void)
  83 {
  84         imx7d_enet_phy_init();
  85         imx7d_enet_clk_sel();
  86 }
  87
  88 static void __init imx7d_init_machine(void)
  89 {
  90         struct device *parent;
  91
  92         parent = imx_soc_device_init();
  93         if (parent == NULL)
  94                 pr_warn("failed to initialize soc device\n");
  95
  96         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  97         imx_anatop_init();
  98         imx7d_enet_init();
  99 }
 100
 101 static void __init imx7d_init_irq(void)
 102 {
 103         imx_init_revision_from_anatop();
 104         imx_src_init();
 105         irqchip_init();
 106 }
 107
 108 static const char *const imx7d_dt_compat[] __initconst = {
 109         "fsl,imx7d",
 110         NULL,
 111 };
 112
 113 DT_MACHINE_START(IMX7D, "Freescale i.MX7 Dual (Device Tree)")
 114         .init_irq       = imx7d_init_irq,
 115         .init_machine   = imx7d_init_machine,
 116         .dt_compat      = imx7d_dt_compat,
 117 MACHINE_END