board/omap2420h4/sys_info.c

/*
 * (C) Copyright 2004
 * Texas Instruments, <www.ti.com>
 * Richard Woodruff <r-woodruff2@ti.com>
 *
 * 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.
 *
 * 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 <asm/arch/omap2420.h>
#include <asm/io.h>
#include <asm/arch/bits.h>
#include <asm/arch/mem.h>  /* get mem tables */
#include <asm/arch/sys_proto.h>
#include <asm/arch/sys_info.h>
#include <i2c.h>

/**************************************************************************
 * get_cpu_type() - low level get cpu type
 * - no C globals yet.
 * - just looking to say if this is a 2422 or 2420 or ...
 * - to start with we will look at switch settings..
 * - 2422 id's same as 2420 for ES1 will rely on H4 board characteristics
 *   (mux for 2420, non-mux for 2422).
 ***************************************************************************/
u32 get_cpu_type(void)
{
	u32 v;

	v = __raw_readl(TAP_IDCODE_REG);
	v &= CPU_24XX_ID_MASK;
	if (v == CPU_2420_CHIPID) {	  /* currently 2420 and 2422 have same id */
		if (is_gpmc_muxed() == GPMC_MUXED)	  /* if mux'ed */
			return(CPU_2420);
		else
			return(CPU_2422);
	} else
		return(CPU_2420); /* don't know, say 2420 */
}

/******************************************
 * get_cpu_rev(void) - extract version info
 ******************************************/
u32 get_cpu_rev(void)
{
	u32 v;
	v = __raw_readl(TAP_IDCODE_REG);
	v = v >> 28;
	return(v+1);  /* currently 2422 and 2420 match up */
}

/***********************************************************
 * get_mem_type() - identify type of mDDR part used.
 * 2422 uses stacked DDR, 2 parts CS0/CS1.
 * 2420 may have 1 or 2, no good way to know...only init 1...
 * when eeprom data is up we can select 1 more.
 *************************************************************/
u32 get_mem_type(void)
{
	if (get_cpu_type() == CPU_2422)
		return(DDR_STACKED);

	if (get_board_type() == BOARD_H4_MENELAUS)
		return(DDR_COMBO);
	else
		return(DDR_DISCRETE);
}

/***********************************************************************
 * get_board_type() - get board type based on current production stats.
 *  --- NOTE: 2 I2C EEPROMs will someday be populated with proper info.
 *      when they are available we can get info from there.  This should
 *      be correct of all known boards up until today.
 ************************************************************************/
u32 get_board_type(void)
{
	if (i2c_probe(I2C_MENELAUS) == 0)
		return(BOARD_H4_MENELAUS);
	else
		return(BOARD_H4_SDP);
}

/******************************************************************
 * get_sysboot_value() - get init word settings (dip switch on h4)
 ******************************************************************/
u32 get_sysboot_value(void)
{
	return(0x00000FFF & __raw_readl(CONTROL_STATUS));
}

/***************************************************************************
 *  get_gpmc0_base() - Return current address hardware will be
 *     fetching from. The below effectively gives what is correct, its a bit
 *   mis-leading compared to the TRM.  For the most general case the mask
 *   needs to be also taken into account this does work in practice.
 *   - for u-boot we currently map:
 *       -- 0 to nothing,
 *       -- 4 to flash
 *       -- 8 to enent
 *       -- c to wifi
 ****************************************************************************/
u32 get_gpmc0_base(void)
{
	u32 b;

	b = __raw_readl(GPMC_CONFIG7_0);
	b &= 0x1F;	 /* keep base [5:0] */
	b = b << 24; /* ret 0x0b000000 */
	return(b);
}

/*****************************************************************
 *  is_gpmc_muxed() - tells if address/data lines are multiplexed
 *****************************************************************/
u32 is_gpmc_muxed(void)
{
	u32 mux;
	mux = get_sysboot_value();
	if (mux & BIT1)	   /* if mux'ed */
		return(GPMC_MUXED);
	else
		return(GPMC_NONMUXED);
}

/************************************************************************
 *  get_gpmc0_type() - read sysboot lines to see type of memory attached
 ************************************************************************/
u32 get_gpmc0_type(void)
{
	u32 type;
	type = get_sysboot_value();
	if ((type & (BIT3|BIT2)) == (BIT3|BIT2))
		return(TYPE_NAND);
	else
		return(TYPE_NOR);
}

/*******************************************************************
 * get_gpmc0_width() - See if bus is in x8 or x16 (mainly for nand)
 *******************************************************************/
u32 get_gpmc0_width(void)
{
	u32 width;
	width = get_sysboot_value();
	if ((width & 0xF) == (BIT3|BIT2))
		return(WIDTH_8BIT);
	else
		return(WIDTH_16BIT);
}

/*********************************************************************
 * wait_on_value() - common routine to allow waiting for changes in
 *   volatile regs.
 *********************************************************************/
u32 wait_on_value(u32 read_bit_mask, u32 match_value, u32 read_addr, u32 bound)
{
	u32 i = 0, val;
	do {
		++i;
		val = __raw_readl(read_addr) & read_bit_mask;
		if (val == match_value)
			return(1);
		if (i==bound)
			return(0);
	} while (1);
}

/*********************************************************************
 *  display_board_info() - print banner with board info.
 *********************************************************************/
void display_board_info(u32 btype)
{
	char cpu_2420[] = "2420";
	char cpu_2422[] = "2422";
	char db_men[] = "Menelaus";
	char db_ip[]= "IP";
	char *cpu_s, *db_s;
	u32 cpu = get_cpu_type();

	if(cpu == CPU_2420)
		cpu_s = cpu_2420;
	else
		cpu_s = cpu_2422;
	if(btype ==  BOARD_H4_MENELAUS)
		db_s = db_men;
	else
		db_s = db_ip;
	printf("TI H4 SDP Base Board with OMAP%s %s Daughter Board\n",cpu_s, db_s);
}