module-tx28.c
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/*
* Copyright (C) 2010 <LW@KARO-electronics.de>
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/fec.h>
#include <linux/gpio.h>
#include <mach/iomux-mx28.h>
#include "../devices-mx28.h"
#include "module-tx28.h"
#define TX28_FEC_PHY_POWER MXS_GPIO_NR(3, 29)
#define TX28_FEC_PHY_RESET MXS_GPIO_NR(4, 13)
static const iomux_cfg_t tx28_fec_gpio_pads[] __initconst = {
/* PHY POWER */
MX28_PAD_PWM4__GPIO_3_29 |
MXS_PAD_4MA | MXS_PAD_NOPULL | MXS_PAD_3V3,
/* PHY RESET */
MX28_PAD_ENET0_RX_CLK__GPIO_4_13 |
MXS_PAD_4MA | MXS_PAD_NOPULL | MXS_PAD_3V3,
/* Mode strap pins 0-2 */
MX28_PAD_ENET0_RXD0__GPIO_4_3 |
MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3,
MX28_PAD_ENET0_RXD1__GPIO_4_4 |
MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3,
MX28_PAD_ENET0_RX_EN__GPIO_4_2 |
MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3,
/* nINT */
MX28_PAD_ENET0_TX_CLK__GPIO_4_5 |
MXS_PAD_4MA | MXS_PAD_NOPULL | MXS_PAD_3V3,
MX28_PAD_ENET0_MDC__GPIO_4_0,
MX28_PAD_ENET0_MDIO__GPIO_4_1,
MX28_PAD_ENET0_TX_EN__GPIO_4_6,
MX28_PAD_ENET0_TXD0__GPIO_4_7,
MX28_PAD_ENET0_TXD1__GPIO_4_8,
MX28_PAD_ENET_CLK__GPIO_4_16,
};
#define FEC_MODE (MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3)
static const iomux_cfg_t tx28_fec0_pads[] __initconst = {
MX28_PAD_ENET0_MDC__ENET0_MDC | FEC_MODE,
MX28_PAD_ENET0_MDIO__ENET0_MDIO | FEC_MODE,
MX28_PAD_ENET0_RX_EN__ENET0_RX_EN | FEC_MODE,
MX28_PAD_ENET0_RXD0__ENET0_RXD0 | FEC_MODE,
MX28_PAD_ENET0_RXD1__ENET0_RXD1 | FEC_MODE,
MX28_PAD_ENET0_TX_EN__ENET0_TX_EN | FEC_MODE,
MX28_PAD_ENET0_TXD0__ENET0_TXD0 | FEC_MODE,
MX28_PAD_ENET0_TXD1__ENET0_TXD1 | FEC_MODE,
MX28_PAD_ENET_CLK__CLKCTRL_ENET | FEC_MODE,
};
static const iomux_cfg_t tx28_fec1_pads[] __initconst = {
MX28_PAD_ENET0_RXD2__ENET1_RXD0,
MX28_PAD_ENET0_RXD3__ENET1_RXD1,
MX28_PAD_ENET0_TXD2__ENET1_TXD0,
MX28_PAD_ENET0_TXD3__ENET1_TXD1,
MX28_PAD_ENET0_COL__ENET1_TX_EN,
MX28_PAD_ENET0_CRS__ENET1_RX_EN,
};
static const struct fec_platform_data tx28_fec0_data __initconst = {
.phy = PHY_INTERFACE_MODE_RMII,
};
static const struct fec_platform_data tx28_fec1_data __initconst = {
.phy = PHY_INTERFACE_MODE_RMII,
};
int __init tx28_add_fec0(void)
{
int i, ret;
pr_debug("%s: Switching FEC PHY power off\n", __func__);
ret = mxs_iomux_setup_multiple_pads(tx28_fec_gpio_pads,
ARRAY_SIZE(tx28_fec_gpio_pads));
for (i = 0; i < ARRAY_SIZE(tx28_fec_gpio_pads); i++) {
unsigned int gpio = MXS_GPIO_NR(PAD_BANK(tx28_fec_gpio_pads[i]),
PAD_PIN(tx28_fec_gpio_pads[i]));
ret = gpio_request(gpio, "FEC");
if (ret) {
pr_err("Failed to request GPIO_%d_%d: %d\n",
PAD_BANK(tx28_fec_gpio_pads[i]),
PAD_PIN(tx28_fec_gpio_pads[i]), ret);
goto free_gpios;
}
ret = gpio_direction_output(gpio, 0);
if (ret) {
pr_err("Failed to set direction of GPIO_%d_%d to output: %d\n",
gpio / 32 + 1, gpio % 32, ret);
goto free_gpios;
}
}
/* Power up fec phy */
pr_debug("%s: Switching FEC PHY power on\n", __func__);
ret = gpio_direction_output(TX28_FEC_PHY_POWER, 1);
if (ret) {
pr_err("Failed to power on PHY: %d\n", ret);
goto free_gpios;
}
mdelay(26); /* 25ms according to data sheet */
/* nINT */
gpio_direction_input(MXS_GPIO_NR(4, 5));
/* Mode strap pins */
gpio_direction_output(MXS_GPIO_NR(4, 2), 1);
gpio_direction_output(MXS_GPIO_NR(4, 3), 1);
gpio_direction_output(MXS_GPIO_NR(4, 4), 1);
udelay(100); /* minimum assertion time for nRST */
pr_debug("%s: Deasserting FEC PHY RESET\n", __func__);
gpio_set_value(TX28_FEC_PHY_RESET, 1);
ret = mxs_iomux_setup_multiple_pads(tx28_fec0_pads,
ARRAY_SIZE(tx28_fec0_pads));
if (ret) {
pr_debug("%s: mxs_iomux_setup_multiple_pads() failed with rc: %d\n",
__func__, ret);
goto free_gpios;
}
pr_debug("%s: Registering FEC0 device\n", __func__);
mx28_add_fec(0, &tx28_fec0_data);
return 0;
free_gpios:
while (--i >= 0) {
unsigned int gpio = MXS_GPIO_NR(PAD_BANK(tx28_fec_gpio_pads[i]),
PAD_PIN(tx28_fec_gpio_pads[i]));
gpio_free(gpio);
}
return ret;
}
int __init tx28_add_fec1(void)
{
int ret;
ret = mxs_iomux_setup_multiple_pads(tx28_fec1_pads,
ARRAY_SIZE(tx28_fec1_pads));
if (ret) {
pr_debug("%s: mxs_iomux_setup_multiple_pads() failed with rc: %d\n",
__func__, ret);
return ret;
}
pr_debug("%s: Registering FEC1 device\n", __func__);
mx28_add_fec(1, &tx28_fec1_data);
return 0;
}