arch/arm/mach-imx/mach-imx6sx.c

   1 /*
   2  * Copyright 2014 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
   9 #include <linux/irqchip.h>
  10 #include <linux/of_platform.h>
  11 #include <linux/phy.h>
  12 #include <linux/regmap.h>
  13 #include <linux/mfd/syscon.h>
  14 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  15 #include <asm/mach/arch.h>
  16 #include <asm/mach/map.h>
  17
  18 #include "common.h"
  19 #include "cpuidle.h"
  20
  21 static int ar8031_phy_fixup(struct phy_device *dev)
  22 {
  23         u16 val;
  24
  25         /* Set RGMII IO voltage to 1.8V */
  26         phy_write(dev, 0x1d, 0x1f);
  27         phy_write(dev, 0x1e, 0x8);
  28
  29         /* introduce tx clock delay */
  30         phy_write(dev, 0x1d, 0x5);
  31         val = phy_read(dev, 0x1e);
  32         val |= 0x0100;
  33         phy_write(dev, 0x1e, val);
  34
  35         return 0;
  36 }
  37
  38 #define PHY_ID_AR8031   0x004dd074
  39 static void __init imx6sx_enet_phy_init(void)
  40 {
  41         if (IS_BUILTIN(CONFIG_PHYLIB))
  42                 phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
  43                                            ar8031_phy_fixup);
  44 }
  45
  46 static void __init imx6sx_enet_clk_sel(void)
  47 {
  48         struct regmap *gpr;
  49
  50         gpr = syscon_regmap_lookup_by_compatible("fsl,imx6sx-iomuxc-gpr");
  51         if (!IS_ERR(gpr)) {
  52                 regmap_update_bits(gpr, IOMUXC_GPR1,
  53                                    IMX6SX_GPR1_FEC_CLOCK_MUX_SEL_MASK, 0);
  54                 regmap_update_bits(gpr, IOMUXC_GPR1,
  55                                    IMX6SX_GPR1_FEC_CLOCK_PAD_DIR_MASK, 0);
  56         } else {
  57                 pr_err("failed to find fsl,imx6sx-iomux-gpr regmap\n");
  58         }
  59 }
  60
  61 static inline void imx6sx_enet_init(void)
  62 {
  63         imx6sx_enet_phy_init();
  64         imx6sx_enet_clk_sel();
  65 }
  66
  67 static void __init imx6sx_init_machine(void)
  68 {
  69         struct device *parent;
  70
  71         mxc_arch_reset_init_dt();
  72
  73         parent = imx_soc_device_init();
  74         if (parent == NULL)
  75                 pr_warn("failed to initialize soc device\n");
  76
  77         of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
  78
  79         imx6sx_enet_init();
  80         imx_anatop_init();
  81         imx6sx_pm_init();
  82 }
  83
  84 static void __init imx6sx_init_irq(void)
  85 {
  86         imx_init_revision_from_anatop();
  87         imx_init_l2cache();
  88         imx_src_init();
  89         imx_gpc_init();
  90         irqchip_init();
  91 }
  92
  93 static void __init imx6sx_init_late(void)
  94 {
  95         imx6q_cpuidle_init();
  96
  97         if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ))
  98                 platform_device_register_simple("imx6q-cpufreq", -1, NULL, 0);
  99 }
 100
 101 static const char * const imx6sx_dt_compat[] __initconst = {
 102         "fsl,imx6sx",
 103         NULL,
 104 };
 105
 106 DT_MACHINE_START(IMX6SX, "Freescale i.MX6 SoloX (Device Tree)")
 107         .map_io         = debug_ll_io_init,
 108         .init_irq       = imx6sx_init_irq,
 109         .init_machine   = imx6sx_init_machine,
 110         .dt_compat      = imx6sx_dt_compat,
 111         .init_late      = imx6sx_init_late,
 112         .restart        = mxc_restart,
 113 MACHINE_END