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_fec_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 struct fec_platform_data tx28_fec_data __initconst = {
  61         .phy = PHY_INTERFACE_MODE_RMII,
  62 };
  63
  64 int __init tx28_add_fec0(void)
  65 {
  66         int i, ret;
  67
  68         pr_debug("%s: Switching FEC PHY power off\n", __func__);
  69         ret = mxs_iomux_setup_multiple_pads(tx28_fec_gpio_pads,
  70                         ARRAY_SIZE(tx28_fec_gpio_pads));
  71         for (i = 0; i < ARRAY_SIZE(tx28_fec_gpio_pads); i++) {
  72                 unsigned int gpio = MXS_GPIO_NR(PAD_BANK(tx28_fec_gpio_pads[i]),
  73                         PAD_PIN(tx28_fec_gpio_pads[i]));
  74
  75                 ret = gpio_request(gpio, "FEC");
  76                 if (ret) {
  77                         pr_err("Failed to request GPIO_%d_%d: %d\n",
  78                                 PAD_BANK(tx28_fec_gpio_pads[i]),
  79                                 PAD_PIN(tx28_fec_gpio_pads[i]), ret);
  80                         goto free_gpios;
  81                 }
  82                 ret = gpio_direction_output(gpio, 0);
  83                 if (ret) {
  84                         pr_err("Failed to set direction of GPIO_%d_%d to output: %d\n",
  85                                         gpio / 32 + 1, gpio % 32, ret);
  86                         goto free_gpios;
  87                 }
  88         }
  89
  90         /* Power up fec phy */
  91         pr_debug("%s: Switching FEC PHY power on\n", __func__);
  92         ret = gpio_direction_output(TX28_FEC_PHY_POWER, 1);
  93         if (ret) {
  94                 pr_err("Failed to power on PHY: %d\n", ret);
  95                 goto free_gpios;
  96         }
  97         mdelay(26); /* 25ms according to data sheet */
  98
  99         /* nINT */
 100         gpio_direction_input(MXS_GPIO_NR(4, 5));
 101         /* Mode strap pins */
 102         gpio_direction_output(MXS_GPIO_NR(4, 2), 1);
 103         gpio_direction_output(MXS_GPIO_NR(4, 3), 1);
 104         gpio_direction_output(MXS_GPIO_NR(4, 4), 1);
 105
 106         udelay(100); /* minimum assertion time for nRST */
 107
 108         pr_debug("%s: Deasserting FEC PHY RESET\n", __func__);
 109         gpio_set_value(TX28_FEC_PHY_RESET, 1);
 110
 111         ret = mxs_iomux_setup_multiple_pads(tx28_fec_pads,
 112                         ARRAY_SIZE(tx28_fec_pads));
 113         if (ret) {
 114                 pr_debug("%s: mxs_iomux_setup_multiple_pads() failed with rc: %d\n",
 115                                 __func__, ret);
 116                 goto free_gpios;
 117         }
 118         pr_debug("%s: Registering FEC device\n", __func__);
 119         mx28_add_fec(0, &tx28_fec_data);
 120         return 0;
 121
 122 free_gpios:
 123         while (--i >= 0) {
 124                 unsigned int gpio = MXS_GPIO_NR(PAD_BANK(tx28_fec_gpio_pads[i]),
 125                         PAD_PIN(tx28_fec_gpio_pads[i]));
 126
 127                 gpio_free(gpio);
 128         }
 129
 130         return ret;
 131 }