arch/arm/mach-mxs/module-tx28.c

   1 /*
   2  * Copyright (C) 2010 <LW@KARO-electronics.de>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it under
   5  * the terms of the GNU General Public License version 2 as published by the
   6  * Free Software Foundation.
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/fec.h>
  11 #include <linux/gpio.h>
  12
  13 #include <mach/iomux-mx28.h>
  14 #include "devices-mx28.h"
  15
  16 #include "module-tx28.h"
  17
  18 #define TX28_FEC_PHY_POWER      MXS_GPIO_NR(3, 29)
  19 #define TX28_FEC_PHY_RESET      MXS_GPIO_NR(4, 13)
  20
  21 static const iomux_cfg_t tx28_fec_gpio_pads[] __initconst = {
  22         /* PHY POWER */
  23         MX28_PAD_PWM4__GPIO_3_29 |
  24                 MXS_PAD_4MA | MXS_PAD_NOPULL | MXS_PAD_3V3,
  25         /* PHY RESET */
  26         MX28_PAD_ENET0_RX_CLK__GPIO_4_13 |
  27                 MXS_PAD_4MA | MXS_PAD_NOPULL | MXS_PAD_3V3,
  28         /* Mode strap pins 0-2 */
  29         MX28_PAD_ENET0_RXD0__GPIO_4_3 |
  30                 MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3,
  31         MX28_PAD_ENET0_RXD1__GPIO_4_4 |
  32                 MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3,
  33         MX28_PAD_ENET0_RX_EN__GPIO_4_2 |
  34                 MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3,
  35         /* nINT */
  36         MX28_PAD_ENET0_TX_CLK__GPIO_4_5 |
  37                 MXS_PAD_4MA | MXS_PAD_NOPULL | MXS_PAD_3V3,
  38
  39         MX28_PAD_ENET0_MDC__GPIO_4_0,
  40         MX28_PAD_ENET0_MDIO__GPIO_4_1,
  41         MX28_PAD_ENET0_TX_EN__GPIO_4_6,
  42         MX28_PAD_ENET0_TXD0__GPIO_4_7,
  43         MX28_PAD_ENET0_TXD1__GPIO_4_8,
  44         MX28_PAD_ENET_CLK__GPIO_4_16,
  45 };
  46
  47 #define FEC_MODE (MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3)
  48 static const iomux_cfg_t tx28_fec0_pads[] __initconst = {
  49         MX28_PAD_ENET0_MDC__ENET0_MDC | FEC_MODE,
  50         MX28_PAD_ENET0_MDIO__ENET0_MDIO | FEC_MODE,
  51         MX28_PAD_ENET0_RX_EN__ENET0_RX_EN | FEC_MODE,
  52         MX28_PAD_ENET0_RXD0__ENET0_RXD0 | FEC_MODE,
  53         MX28_PAD_ENET0_RXD1__ENET0_RXD1 | FEC_MODE,
  54         MX28_PAD_ENET0_TX_EN__ENET0_TX_EN | FEC_MODE,
  55         MX28_PAD_ENET0_TXD0__ENET0_TXD0 | FEC_MODE,
  56         MX28_PAD_ENET0_TXD1__ENET0_TXD1 | FEC_MODE,
  57         MX28_PAD_ENET_CLK__CLKCTRL_ENET | FEC_MODE,
  58 };
  59
  60 static const iomux_cfg_t tx28_fec1_pads[] __initconst = {
  61         MX28_PAD_ENET0_RXD2__ENET1_RXD0,
  62         MX28_PAD_ENET0_RXD3__ENET1_RXD1,
  63         MX28_PAD_ENET0_TXD2__ENET1_TXD0,
  64         MX28_PAD_ENET0_TXD3__ENET1_TXD1,
  65         MX28_PAD_ENET0_COL__ENET1_TX_EN,
  66         MX28_PAD_ENET0_CRS__ENET1_RX_EN,
  67 };
  68
  69 static const struct fec_platform_data tx28_fec0_data __initconst = {
  70         .phy = PHY_INTERFACE_MODE_RMII,
  71 };
  72
  73 static const struct fec_platform_data tx28_fec1_data __initconst = {
  74         .phy = PHY_INTERFACE_MODE_RMII,
  75 };
  76
  77 int __init tx28_add_fec0(void)
  78 {
  79         int i, ret;
  80
  81         pr_debug("%s: Switching FEC PHY power off\n", __func__);
  82         ret = mxs_iomux_setup_multiple_pads(tx28_fec_gpio_pads,
  83                         ARRAY_SIZE(tx28_fec_gpio_pads));
  84         for (i = 0; i < ARRAY_SIZE(tx28_fec_gpio_pads); i++) {
  85                 unsigned int gpio = MXS_GPIO_NR(PAD_BANK(tx28_fec_gpio_pads[i]),
  86                         PAD_PIN(tx28_fec_gpio_pads[i]));
  87
  88                 ret = gpio_request(gpio, "FEC");
  89                 if (ret) {
  90                         pr_err("Failed to request GPIO_%d_%d: %d\n",
  91                                 PAD_BANK(tx28_fec_gpio_pads[i]),
  92                                 PAD_PIN(tx28_fec_gpio_pads[i]), ret);
  93                         goto free_gpios;
  94                 }
  95                 ret = gpio_direction_output(gpio, 0);
  96                 if (ret) {
  97                         pr_err("Failed to set direction of GPIO_%d_%d to output: %d\n",
  98                                         gpio / 32 + 1, gpio % 32, ret);
  99                         goto free_gpios;
 100                 }
 101         }
 102
 103         /* Power up fec phy */
 104         pr_debug("%s: Switching FEC PHY power on\n", __func__);
 105         ret = gpio_direction_output(TX28_FEC_PHY_POWER, 1);
 106         if (ret) {
 107                 pr_err("Failed to power on PHY: %d\n", ret);
 108                 goto free_gpios;
 109         }
 110         mdelay(26); /* 25ms according to data sheet */
 111
 112         /* nINT */
 113         gpio_direction_input(MXS_GPIO_NR(4, 5));
 114         /* Mode strap pins */
 115         gpio_direction_output(MXS_GPIO_NR(4, 2), 1);
 116         gpio_direction_output(MXS_GPIO_NR(4, 3), 1);
 117         gpio_direction_output(MXS_GPIO_NR(4, 4), 1);
 118
 119         udelay(100); /* minimum assertion time for nRST */
 120
 121         pr_debug("%s: Deasserting FEC PHY RESET\n", __func__);
 122         gpio_set_value(TX28_FEC_PHY_RESET, 1);
 123
 124         ret = mxs_iomux_setup_multiple_pads(tx28_fec0_pads,
 125                         ARRAY_SIZE(tx28_fec0_pads));
 126         if (ret) {
 127                 pr_debug("%s: mxs_iomux_setup_multiple_pads() failed with rc: %d\n",
 128                                 __func__, ret);
 129                 goto free_gpios;
 130         }
 131         pr_debug("%s: Registering FEC0 device\n", __func__);
 132         mx28_add_fec(0, &tx28_fec0_data);
 133         return 0;
 134
 135 free_gpios:
 136         while (--i >= 0) {
 137                 unsigned int gpio = MXS_GPIO_NR(PAD_BANK(tx28_fec_gpio_pads[i]),
 138                         PAD_PIN(tx28_fec_gpio_pads[i]));
 139
 140                 gpio_free(gpio);
 141         }
 142
 143         return ret;
 144 }
 145
 146 int __init tx28_add_fec1(void)
 147 {
 148         int ret;
 149
 150         ret = mxs_iomux_setup_multiple_pads(tx28_fec1_pads,
 151                         ARRAY_SIZE(tx28_fec1_pads));
 152         if (ret) {
 153                 pr_debug("%s: mxs_iomux_setup_multiple_pads() failed with rc: %d\n",
 154                                 __func__, ret);
 155                 return ret;
 156         }
 157         pr_debug("%s: Registering FEC1 device\n", __func__);
 158         mx28_add_fec(1, &tx28_fec1_data);
 159         return 0;
 160 }