/*
 * Copyright (C) 2010 Juergen Beisert, Pengutronix <kernel@pengutronix.de>
 *
 * 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 <common.h>
#include <init.h>
#include <gpio.h>
#include <environment.h>
#include <errno.h>
#include <asm/armlinux.h>
#include <asm/io.h>
#include <generated/mach-types.h>
#include <mach/imx-regs.h>
#include <asm/mmu.h>

static struct memory_platform_data ram_pdata = {
	.name = "ram0",
	.flags = DEVFS_RDWR,
};

static struct device_d sdram_dev = {
	.id = -1,
	.name = "mem",
	.map_base = IMX_MEMORY_BASE,
	.size = 128 * 1024 * 1024,
	.platform_data = &ram_pdata,
};

/* setup the CPU card internal signals */
static const uint32_t tx28_pad_setup[] = {
	/* NAND interface */
	GPMI_D0 | VE_3_3V | PULLUP(1),
	GPMI_D1 | VE_3_3V | PULLUP(1),
	GPMI_D2 | VE_3_3V | PULLUP(1),
	GPMI_D3 | VE_3_3V | PULLUP(1),
	GPMI_D4 | VE_3_3V | PULLUP(1),
	GPMI_D5 | VE_3_3V | PULLUP(1),
	GPMI_D6 | VE_3_3V | PULLUP(1),
	GPMI_D7 | VE_3_3V | PULLUP(1),
	GPMI_READY0 | VE_3_3V | PULLUP(0),	/* external PU */
	GPMI_RDN | VE_3_3V | PULLUP(1),
	GPMI_WRN | VE_3_3V | BITKEEPER(1),
	GPMI_ALE | VE_3_3V | PULLUP(1),
	GPMI_CLE | VE_3_3V | PULLUP(1),
	GPMI_RESETN_GPIO | VE_3_3V | GPIO_IN,	/* act as WP, external PU */

	/* Network interface */

	/*
	 * Note: To setup the external phy in a manner the baseboard
	 * supports, its configuration is divided into a small part here in
	 * the CPU card setup and the remaining configuration in the baseboard
	 * file.
	 * Here: Switch on the power supply to the external phy, but keep its
	 * reset line low.
	 */

	/* send a "good morning" to the ext. phy 0 = reset */
	ENET0_RX_CLK_GPIO | VE_3_3V | PULLUP(0) | GPIO_OUT | GPIO_VALUE(0),

	/* phy power control 1 = on */
	PWM4_GPIO | VE_3_3V | GPIO_OUT | PULLUP(0) | GPIO_VALUE(1),

	ENET_CLK | VE_3_3V | BITKEEPER(0),
	ENET0_MDC | VE_3_3V | PULLUP(0),
	ENET0_MDIO | VE_3_3V | PULLUP(0),
	ENET0_TXD0 | VE_3_3V | PULLUP(0),
	ENET0_TXD1 | VE_3_3V | PULLUP(0),
	ENET0_TX_EN | VE_3_3V | PULLUP(0),
	ENET0_TX_CLK | VE_3_3V | BITKEEPER(0),

};

extern void base_board_init(void);

#ifdef CONFIG_MMU
static int tx28_mmu_init(void)
{
	mmu_init();

	arm_create_section(0x40000000, 0x40000000, 128, PMD_SECT_DEF_CACHED);
	arm_create_section(0x50000000, 0x40000000, 128, PMD_SECT_DEF_UNCACHED);

	setup_dma_coherent(0x10000000);

	mmu_enable();

	return 0;
}
postcore_initcall(tx28_mmu_init);
#endif

static int tx28_devices_init(void)
{
	int i;

	/* initizalize gpios */
	for (i = 0; i < ARRAY_SIZE(tx28_pad_setup); i++)
		imx_gpio_mode(tx28_pad_setup[i]);

	register_device(&sdram_dev);

	armlinux_add_dram(&sdram_dev);
	armlinux_set_bootparams((void *)(sdram_dev.map_base + 0x100));
	armlinux_set_architecture(MACH_TYPE_TX28);

	base_board_init();

	return 0;
}

device_initcall(tx28_devices_init);

/**
@page tx28 KARO's TX28 CPU module

@section tx28_cpu_card The CPU module

http://www.karo-electronics.de/

This CPU card is based on a Freescale i.MX28 CPU. The card is shipped with:

- 128 MiB synchronous dynamic RAM (DDR2 type), 200 MHz support
- 128 MiB NAND K9F1G08U0A (3.3V type)
- PCA9554 GPIO expander
- DS1339 RTC
- LAN8710 Phy

@section tx28_basboards Supported baseboards

Supported baseboards are:
- KARO's Starterkit 5

@section tx28_stk5_howto How to get barebox for 'KARO's Starterkit 5'

Using the default configuration:

@verbatim
make ARCH=arm tx28stk5_defconfig
@endverbatim

Build the binary image:

@verbatim
make ARCH=arm CROSS_COMPILE=armv5compiler
@endverbatim

@note replace the armv5compiler with your ARM v5 cross compiler.

@note To use the result, you also need the following resources from Freescale:
- the 'bootlets' archive
- the 'elftosb2' encryption tool
- in the case you want to start @b barebox from an attached SD card the
  'sdimage' tool from Freescale's 'uuc' archive.

@section tx28_mlayout Memory layout when barebox is running:

- 0x40000000 start of SDRAM
- 0x40000100 start of kernel's boot parameters
  - below malloc area: stack area
  - below barebox: malloc area
- 0x47000000 start of @b barebox

*/