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1cb59f9f79
Based on code created by Lothar Waßmann, Sascha Hauer, Wolfram Sang and me. Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
/*
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* Copyright (C) 2010 <LW@KARO-electronics.de>
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by the
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* Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/fec.h>
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#include <linux/gpio.h>
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#include <mach/iomux-mx28.h>
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#include "../devices-mx28.h"
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#include "module-tx28.h"
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#define TX28_FEC_PHY_POWER MXS_GPIO_NR(3, 29)
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#define TX28_FEC_PHY_RESET MXS_GPIO_NR(4, 13)
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static const iomux_cfg_t tx28_fec_gpio_pads[] __initconst = {
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/* PHY POWER */
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MX28_PAD_PWM4__GPIO_3_29 |
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MXS_PAD_4MA | MXS_PAD_NOPULL | MXS_PAD_3V3,
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/* PHY RESET */
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MX28_PAD_ENET0_RX_CLK__GPIO_4_13 |
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MXS_PAD_4MA | MXS_PAD_NOPULL | MXS_PAD_3V3,
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/* Mode strap pins 0-2 */
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MX28_PAD_ENET0_RXD0__GPIO_4_3 |
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MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3,
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MX28_PAD_ENET0_RXD1__GPIO_4_4 |
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MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3,
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MX28_PAD_ENET0_RX_EN__GPIO_4_2 |
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MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3,
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/* nINT */
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MX28_PAD_ENET0_TX_CLK__GPIO_4_5 |
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MXS_PAD_4MA | MXS_PAD_NOPULL | MXS_PAD_3V3,
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MX28_PAD_ENET0_MDC__GPIO_4_0,
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MX28_PAD_ENET0_MDIO__GPIO_4_1,
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MX28_PAD_ENET0_TX_EN__GPIO_4_6,
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MX28_PAD_ENET0_TXD0__GPIO_4_7,
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MX28_PAD_ENET0_TXD1__GPIO_4_8,
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MX28_PAD_ENET_CLK__GPIO_4_16,
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};
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#define FEC_MODE (MXS_PAD_8MA | MXS_PAD_PULLUP | MXS_PAD_3V3)
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static const iomux_cfg_t tx28_fec_pads[] __initconst = {
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MX28_PAD_ENET0_MDC__ENET0_MDC | FEC_MODE,
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MX28_PAD_ENET0_MDIO__ENET0_MDIO | FEC_MODE,
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MX28_PAD_ENET0_RX_EN__ENET0_RX_EN | FEC_MODE,
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MX28_PAD_ENET0_RXD0__ENET0_RXD0 | FEC_MODE,
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MX28_PAD_ENET0_RXD1__ENET0_RXD1 | FEC_MODE,
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MX28_PAD_ENET0_TX_EN__ENET0_TX_EN | FEC_MODE,
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MX28_PAD_ENET0_TXD0__ENET0_TXD0 | FEC_MODE,
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MX28_PAD_ENET0_TXD1__ENET0_TXD1 | FEC_MODE,
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MX28_PAD_ENET_CLK__CLKCTRL_ENET | FEC_MODE,
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};
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static const struct fec_platform_data tx28_fec_data __initconst = {
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.phy = PHY_INTERFACE_MODE_RMII,
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};
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int __init tx28_add_fec0(void)
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{
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int i, ret;
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pr_debug("%s: Switching FEC PHY power off\n", __func__);
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ret = mxs_iomux_setup_multiple_pads(tx28_fec_gpio_pads,
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ARRAY_SIZE(tx28_fec_gpio_pads));
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for (i = 0; i < ARRAY_SIZE(tx28_fec_gpio_pads); i++) {
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unsigned int gpio = MXS_GPIO_NR(PAD_BANK(tx28_fec_gpio_pads[i]),
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PAD_PIN(tx28_fec_gpio_pads[i]));
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ret = gpio_request(gpio, "FEC");
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if (ret) {
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pr_err("Failed to request GPIO_%d_%d: %d\n",
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PAD_BANK(tx28_fec_gpio_pads[i]),
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PAD_PIN(tx28_fec_gpio_pads[i]), ret);
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goto free_gpios;
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}
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ret = gpio_direction_output(gpio, 0);
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if (ret) {
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pr_err("Failed to set direction of GPIO_%d_%d to output: %d\n",
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gpio / 32 + 1, gpio % 32, ret);
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goto free_gpios;
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}
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}
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/* Power up fec phy */
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pr_debug("%s: Switching FEC PHY power on\n", __func__);
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ret = gpio_direction_output(TX28_FEC_PHY_POWER, 1);
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if (ret) {
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pr_err("Failed to power on PHY: %d\n", ret);
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goto free_gpios;
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}
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mdelay(26); /* 25ms according to data sheet */
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/* nINT */
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gpio_direction_input(MXS_GPIO_NR(4, 5));
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/* Mode strap pins */
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gpio_direction_output(MXS_GPIO_NR(4, 2), 1);
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gpio_direction_output(MXS_GPIO_NR(4, 3), 1);
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gpio_direction_output(MXS_GPIO_NR(4, 4), 1);
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udelay(100); /* minimum assertion time for nRST */
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pr_debug("%s: Deasserting FEC PHY RESET\n", __func__);
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gpio_set_value(TX28_FEC_PHY_RESET, 1);
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ret = mxs_iomux_setup_multiple_pads(tx28_fec_pads,
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ARRAY_SIZE(tx28_fec_pads));
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if (ret) {
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pr_debug("%s: mxs_iomux_setup_multiple_pads() failed with rc: %d\n",
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__func__, ret);
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goto free_gpios;
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}
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pr_debug("%s: Registering FEC device\n", __func__);
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mx28_add_fec(0, &tx28_fec_data);
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return 0;
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free_gpios:
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while (--i >= 0) {
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unsigned int gpio = MXS_GPIO_NR(PAD_BANK(tx28_fec_gpio_pads[i]),
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PAD_PIN(tx28_fec_gpio_pads[i]));
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gpio_free(gpio);
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}
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return ret;
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}
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