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TOMOYO Linux Cross Reference
Linux/arch/arm/mach-mxs/module-tx28.c

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  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 }
161 

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