linux/arch/arm/mach-mxs/mach-mx28evk.c

/*
 * Copyright 2010 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/clk.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>

#include <mach/common.h>
#include <mach/iomux-mx28.h>

#include "devices-mx28.h"
#include "gpio.h"

#define MX28EVK_FLEXCAN_SWITCH	MXS_GPIO_NR(2, 13)
#define MX28EVK_FEC_PHY_POWER	MXS_GPIO_NR(2, 15)
#define MX28EVK_FEC_PHY_RESET	MXS_GPIO_NR(4, 13)

static const iomux_cfg_t mx28evk_pads[] __initconst = {
	/* duart */
	MX28_PAD_PWM0__DUART_RX | MXS_PAD_CTRL,
	MX28_PAD_PWM1__DUART_TX | MXS_PAD_CTRL,

	/* auart0 */
	MX28_PAD_AUART0_RX__AUART0_RX | MXS_PAD_CTRL,
	MX28_PAD_AUART0_TX__AUART0_TX | MXS_PAD_CTRL,
	MX28_PAD_AUART0_CTS__AUART0_CTS | MXS_PAD_CTRL,
	MX28_PAD_AUART0_RTS__AUART0_RTS | MXS_PAD_CTRL,
	/* auart3 */
	MX28_PAD_AUART3_RX__AUART3_RX | MXS_PAD_CTRL,
	MX28_PAD_AUART3_TX__AUART3_TX | MXS_PAD_CTRL,
	MX28_PAD_AUART3_CTS__AUART3_CTS | MXS_PAD_CTRL,
	MX28_PAD_AUART3_RTS__AUART3_RTS | MXS_PAD_CTRL,

#define MXS_PAD_FEC	(MXS_PAD_8MA | MXS_PAD_3V3 | MXS_PAD_PULLUP)
	/* fec0 */
	MX28_PAD_ENET0_MDC__ENET0_MDC | MXS_PAD_FEC,
	MX28_PAD_ENET0_MDIO__ENET0_MDIO | MXS_PAD_FEC,
	MX28_PAD_ENET0_RX_EN__ENET0_RX_EN | MXS_PAD_FEC,
	MX28_PAD_ENET0_RXD0__ENET0_RXD0 | MXS_PAD_FEC,
	MX28_PAD_ENET0_RXD1__ENET0_RXD1 | MXS_PAD_FEC,
	MX28_PAD_ENET0_TX_EN__ENET0_TX_EN | MXS_PAD_FEC,
	MX28_PAD_ENET0_TXD0__ENET0_TXD0 | MXS_PAD_FEC,
	MX28_PAD_ENET0_TXD1__ENET0_TXD1 | MXS_PAD_FEC,
	MX28_PAD_ENET_CLK__CLKCTRL_ENET | MXS_PAD_FEC,
	/* fec1 */
	MX28_PAD_ENET0_CRS__ENET1_RX_EN | MXS_PAD_FEC,
	MX28_PAD_ENET0_RXD2__ENET1_RXD0 | MXS_PAD_FEC,
	MX28_PAD_ENET0_RXD3__ENET1_RXD1 | MXS_PAD_FEC,
	MX28_PAD_ENET0_COL__ENET1_TX_EN | MXS_PAD_FEC,
	MX28_PAD_ENET0_TXD2__ENET1_TXD0 | MXS_PAD_FEC,
	MX28_PAD_ENET0_TXD3__ENET1_TXD1 | MXS_PAD_FEC,
	/* phy power line */
	MX28_PAD_SSP1_DATA3__GPIO_2_15 | MXS_PAD_CTRL,
	/* phy reset line */
	MX28_PAD_ENET0_RX_CLK__GPIO_4_13 | MXS_PAD_CTRL,

	/* flexcan0 */
	MX28_PAD_GPMI_RDY2__CAN0_TX,
	MX28_PAD_GPMI_RDY3__CAN0_RX,
	/* flexcan1 */
	MX28_PAD_GPMI_CE2N__CAN1_TX,
	MX28_PAD_GPMI_CE3N__CAN1_RX,
	/* transceiver power control */
	MX28_PAD_SSP1_CMD__GPIO_2_13,
};

/* fec */
static void __init mx28evk_fec_reset(void)
{
	int ret;
	struct clk *clk;

	/* Enable fec phy clock */
	clk = clk_get_sys("pll2", NULL);
	if (!IS_ERR(clk))
		clk_enable(clk);

	/* Power up fec phy */
	ret = gpio_request(MX28EVK_FEC_PHY_POWER, "fec-phy-power");
	if (ret) {
		pr_err("Failed to request gpio fec-phy-%s: %d\n", "power", ret);
		return;
	}

	ret = gpio_direction_output(MX28EVK_FEC_PHY_POWER, 0);
	if (ret) {
		pr_err("Failed to drive gpio fec-phy-%s: %d\n", "power", ret);
		return;
	}

	/* Reset fec phy */
	ret = gpio_request(MX28EVK_FEC_PHY_RESET, "fec-phy-reset");
	if (ret) {
		pr_err("Failed to request gpio fec-phy-%s: %d\n", "reset", ret);
		return;
	}

	gpio_direction_output(MX28EVK_FEC_PHY_RESET, 0);
	if (ret) {
		pr_err("Failed to drive gpio fec-phy-%s: %d\n", "reset", ret);
		return;
	}

	mdelay(1);
	gpio_set_value(MX28EVK_FEC_PHY_RESET, 1);
}

static struct fec_platform_data mx28_fec_pdata[] __initdata = {
	{
		/* fec0 */
		.phy = PHY_INTERFACE_MODE_RMII,
	}, {
		/* fec1 */
		.phy = PHY_INTERFACE_MODE_RMII,
	},
};

static int __init mx28evk_fec_get_mac(void)
{
	int i;
	u32 val;
	const u32 *ocotp = mxs_get_ocotp();

	if (!ocotp)
		goto error;

	/*
	 * OCOTP only stores the last 4 octets for each mac address,
	 * so hard-code Freescale OUI (00:04:9f) here.
	 */
	for (i = 0; i < 2; i++) {
		val = ocotp[i * 4];
		mx28_fec_pdata[i].mac[0] = 0x00;
		mx28_fec_pdata[i].mac[1] = 0x04;
		mx28_fec_pdata[i].mac[2] = 0x9f;
		mx28_fec_pdata[i].mac[3] = (val >> 16) & 0xff;
		mx28_fec_pdata[i].mac[4] = (val >> 8) & 0xff;
		mx28_fec_pdata[i].mac[5] = (val >> 0) & 0xff;
	}

	return 0;

error:
	pr_err("%s: timeout when reading fec mac from OCOTP\n", __func__);
	return -ETIMEDOUT;
}

/*
 * MX28EVK_FLEXCAN_SWITCH is shared between both flexcan controllers
 */
static int flexcan0_en, flexcan1_en;

static void mx28evk_flexcan_switch(void)
{
	if (flexcan0_en || flexcan1_en)
		gpio_set_value(MX28EVK_FLEXCAN_SWITCH, 1);
	else
		gpio_set_value(MX28EVK_FLEXCAN_SWITCH, 0);
}

static void mx28evk_flexcan0_switch(int enable)
{
	flexcan0_en = enable;
	mx28evk_flexcan_switch();
}

static void mx28evk_flexcan1_switch(int enable)
{
	flexcan1_en = enable;
	mx28evk_flexcan_switch();
}

static const struct flexcan_platform_data
		mx28evk_flexcan_pdata[] __initconst = {
	{
		.transceiver_switch = mx28evk_flexcan0_switch,
	}, {
		.transceiver_switch = mx28evk_flexcan1_switch,
	}
};

static void __init mx28evk_init(void)
{
	int ret;

	mxs_iomux_setup_multiple_pads(mx28evk_pads, ARRAY_SIZE(mx28evk_pads));

	mx28_add_duart();
	mx28_add_auart0();
	mx28_add_auart3();

	if (mx28evk_fec_get_mac())
		pr_warn("%s: failed on fec mac setup\n", __func__);

	mx28evk_fec_reset();
	mx28_add_fec(0, &mx28_fec_pdata[0]);
	mx28_add_fec(1, &mx28_fec_pdata[1]);

	ret = gpio_request_one(MX28EVK_FLEXCAN_SWITCH, GPIOF_DIR_OUT,
				"flexcan-switch");
	if (ret) {
		pr_err("failed to request gpio flexcan-switch: %d\n", ret);
	} else {
		mx28_add_flexcan(0, &mx28evk_flexcan_pdata[0]);
		mx28_add_flexcan(1, &mx28evk_flexcan_pdata[1]);
	}
}

static void __init mx28evk_timer_init(void)
{
	mx28_clocks_init();
}

static struct sys_timer mx28evk_timer = {
	.init	= mx28evk_timer_init,
};

MACHINE_START(MX28EVK, "Freescale MX28 EVK")
	/* Maintainer: Freescale Semiconductor, Inc. */
	.map_io		= mx28_map_io,
	.init_irq	= mx28_init_irq,
	.init_machine	= mx28evk_init,
	.timer		= &mx28evk_timer,
MACHINE_END