arch/arm/boards/omap/board-omap3evm.c

/**
 * @file
 * @brief Board Initialization routines for OMAP3EVM.
 *
 * FileName: arch/arm/boards/omap/board-omap3evm.c
 *
 * This board is based on OMAP3530.
 * More on OMAP3530 (including documentation can be found here):
 * http://focus.ti.com/docs/prod/folders/print/omap3530.html
 *
 * This file provides initialization in two stages:
 * @li Boot time initialization - just get SDRAM working.
 * This is run from SRAM - so no case constructs and global vars can be used.
 * @li Run time initialization - this is for the rest of the initializations
 * such as flash, uart etc.
 *
 * Boot time initialization includes:
 * @li SDRAM initialization.
 * @li Pin Muxing relevant for the EVM.
 *
 * Run time initialization includes
 * @li serial @ref serial_ns16550.c driver device definition
 *
 * Originally from arch/arm/boards/omap/board-beagle.c
 */

/*
 * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
 * Sanjeev Premi <premi@ti.com>
 *
 * 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.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */


#include <common.h>
#include <console.h>
#include <init.h>
#include <driver.h>
#include <asm/io.h>
#include <ns16550.h>
#include <asm/armlinux.h>
#include <mach/silicon.h>
#include <mach/sdrc.h>
#include <mach/sys_info.h>
#include <mach/syslib.h>
#include <mach/control.h>
#include <mach/omap3-mux.h>
#include <mach/gpmc.h>
#include "board.h"


/*
 * Boot-time initialization(s)
 */

/**
 * @brief Initialize the SDRC module
 *
 * @return void
 */
static void sdrc_init(void)
{
	/* SDRAM software reset */
	/* No idle ack and RESET enable */
	writel(0x1A, SDRC_REG(SYSCONFIG));
	sdelay(100);
	/* No idle ack and RESET disable */
	writel(0x18, SDRC_REG(SYSCONFIG));

	/* SDRC Sharing register */
	/* 32-bit SDRAM on data lane [31:0] - CS0 */
	/* pin tri-stated = 1 */
	writel(0x00000100, SDRC_REG(SHARING));

	/* ----- SDRC Registers Configuration --------- */
	/* SDRC_MCFG0 register */
	writel(0x02584099, SDRC_REG(MCFG_0));

	/* SDRC_RFR_CTRL0 register */
	writel(0x54601, SDRC_REG(RFR_CTRL_0));

	/* SDRC_ACTIM_CTRLA0 register */
	writel(0xA29DB4C6, SDRC_REG(ACTIM_CTRLA_0));

	/* SDRC_ACTIM_CTRLB0 register */
	writel(0x12214, SDRC_REG(ACTIM_CTRLB_0));

	/* Disble Power Down of CKE due to 1 CKE on combo part */
	writel(0x00000081, SDRC_REG(POWER));

	/* SDRC_MANUAL command register */
	/* NOP command */
	writel(0x00000000, SDRC_REG(MANUAL_0));
	/* Precharge command */
	writel(0x00000001, SDRC_REG(MANUAL_0));
	/* Auto-refresh command */
	writel(0x00000002, SDRC_REG(MANUAL_0));
	/* Auto-refresh command */
	writel(0x00000002, SDRC_REG(MANUAL_0));

	/* SDRC MR0 register Burst length=4 */
	writel(0x00000032, SDRC_REG(MR_0));

	/* SDRC DLLA control register */
	writel(0x0000000A, SDRC_REG(DLLA_CTRL));

	return;
}

/**
 * @brief Do the necessary pin muxing required for OMAP3EVM. Some pins in OMAP3
 * do not have alternate modes. We don't program these pins.
 *
 * See @ref MUX_VAL for description of the muxing mode.
 *
 * @return void
 */
static void mux_config(void)
{
	/*
	 * SDRC
	 * - SDRC_D0-SDRC_D31: Default MUX mode is mode0.
	 */

	/*
	 * GPMC
	 * - GPMC_D0-GPMC_D7: Default MUX mode is mode0.
	 * - GPMC_NADV_ALE: Default MUX mode is mode0.
	 * - GPMC_NOE: Default MUX mode is mode0.
	 * - GPMC_NWE: Default MUX mode is mode0.
	 * - GPMC_WAIT0: Default MUX mode is mode0.
	 */
	MUX_VAL(CP(GPMC_A1),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_A2),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_A3),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_A4),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_A5),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_A6),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_A7),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_A8),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_A9),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_A10),		(IDIS | PTD | DIS | M0));

	MUX_VAL(CP(GPMC_D8),		(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_D9),		(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_D10),		(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_D11),		(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_D12),		(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_D13),		(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_D14),		(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_D15),		(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_CLK),		(IDIS | PTD | DIS | M0));

	MUX_VAL(CP(GPMC_NBE0_CLE),	(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_NBE1),		(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(GPMC_NWP),		(IEN  | PTD | DIS | M0));

	MUX_VAL(CP(GPMC_WAIT1),		(IEN  | PTU | EN  | M0));

	/*
	 * Serial Interface
	 */
#if defined(CONFIG_OMAP3EVM_UART1)
	MUX_VAL(CP(UART1_TX),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(UART1_RTS),		(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(UART1_CTS),		(IEN  | PTU | DIS | M0));
	MUX_VAL(CP(UART1_RX),		(IEN  | PTD | DIS | M0));
#elif defined(CONFIG_OMAP3EVM_UART3)
	MUX_VAL(CP(UART3_CTS_RCTX),	(IEN  | PTD | EN  | M0));
	MUX_VAL(CP(UART3_RTS_SD),	(IDIS | PTD | DIS | M0));
	MUX_VAL(CP(UART3_RX_IRRX),	(IEN  | PTD | DIS | M0));
	MUX_VAL(CP(UART3_TX_IRTX),	(IDIS | PTD | DIS | M0));
#endif
}

/**
 * @brief The basic entry point for board initialization.
 *
 * This is called as part of machine init (after arch init).
 * This is again called with stack in SRAM, so not too many
 * constructs possible here.
 *
 * @return void
 */
void board_init(void)
{
	int in_sdram = running_in_sdram();

	mux_config();
	/* Dont reconfigure SDRAM while running in SDRAM! */
	if (!in_sdram)
		sdrc_init();
}

/*
 * Run-time initialization(s)
 */

#ifdef CONFIG_DRIVER_SERIAL_NS16550

static struct NS16550_plat serial_plat = {
	.clock		= 48000000,      /* 48MHz (APLL96/2) */
	.f_caps		= CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR,
	.reg_read	= omap_uart_read,
	.reg_write	= omap_uart_write,
};

static struct device_d omap3evm_serial_device = {
	.id		= -1,
	.name		= "serial_ns16550",
#if defined(CONFIG_OMAP3EVM_UART1)
	.map_base	= OMAP_UART1_BASE,
#elif defined(CONFIG_OMAP3EVM_UART3)
	.map_base	= OMAP_UART3_BASE,
#endif
	.size		= 1024,
	.platform_data	= (void *)&serial_plat,
};

/**
 * @brief Initialize the serial port to be used as console.
 *
 * @return result of device registration
 */
static int omap3evm_init_console(void)
{
	return register_device(&omap3evm_serial_device);
}
console_initcall(omap3evm_init_console);
#endif /* CONFIG_DRIVER_SERIAL_NS16550 */

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

static struct device_d sdram_dev = {
	.id		= -1,
	.name		= "mem",
	.map_base	= 0x80000000,
	.size		= 128 * 1024 * 1024,
	.platform_data	= &sram_pdata,
};

static int omap3evm_init_devices(void)
{
	int ret;

	ret = register_device(&sdram_dev);
	if (ret)
		goto failed;

#ifdef CONFIG_GPMC
	/*
	 * WP is made high and WAIT1 active Low
	 */
	gpmc_generic_init(0x10);
#endif

	armlinux_add_dram(&sdram_dev);

failed:
	return ret;
}
device_initcall(omap3evm_init_devices);