board/davinci/common/misc.c

/*
 * Miscelaneous DaVinci functions.
 *
 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
 * Copyright (C) 2008 Lyrtech <www.lyrtech.com>
 * Copyright (C) 2004 Texas Instruments.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <common.h>
#include <i2c.h>
#include <asm/arch/hardware.h>

DECLARE_GLOBAL_DATA_PTR;

int dram_init(void)
{
	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
	gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;

	return(0);
}

static int dv_get_pllm_output(uint32_t pllm)
{
	return (pllm + 1) * (CONFIG_SYS_HZ_CLOCK / 1000000);
}

void dv_display_clk_infos(void)
{
	printf("ARM Clock: %dMHz\n", dv_get_pllm_output(REG(PLL1_PLLM)) / 2);
	printf("DDR Clock: %dMHz\n", dv_get_pllm_output(REG(PLL2_PLLM)) /
	       ((REG(PLL2_DIV2) & 0x1f) + 1) / 2);
}

/* Read ethernet MAC address from EEPROM for DVEVM compatible boards.
 * Returns 1 if found, 0 otherwise.
 */
int dvevm_read_mac_address(uint8_t *buf)
{
#ifdef CONFIG_SYS_I2C_EEPROM_ADDR
	/* Read MAC address. */
	if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0x7F00, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
		     (uint8_t *) &buf[0], 6))
		goto i2cerr;

	/* Check that MAC address is not null. */
	if (memcmp(buf, "\0\0\0\0\0\0", 6) == 0)
		goto err;

	return 1; /* Found */

i2cerr:
	printf("Read from EEPROM @ 0x%02x failed\n", CONFIG_SYS_I2C_EEPROM_ADDR);
err:
#endif /* CONFIG_SYS_I2C_EEPROM_ADDR */

	return 0;
}

/* If there is a MAC address in the environment, and if it is not identical to
 * the MAC address in the ROM, then a warning is printed and the MAC address
 * from the environment is used.
 *
 * If there is no MAC address in the environment, then it will be initialized
 * (silently) from the value in the ROM.
 */
void dv_configure_mac_address(uint8_t *rom_enetaddr)
{
	int i;
	u_int8_t env_enetaddr[6];
	char *tmp = getenv("ethaddr");
	char *end;

	/* Read Ethernet MAC address from the U-Boot environment.
	 * If it is not defined, env_enetaddr[] will be cleared. */
	for (i = 0; i < 6; i++) {
		env_enetaddr[i] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
		if (tmp)
			tmp = (*end) ? end+1 : end;
	}

	/* Check if ROM and U-Boot environment MAC addresses match. */
	if (memcmp(env_enetaddr, "\0\0\0\0\0\0", 6) != 0 &&
	    memcmp(env_enetaddr, rom_enetaddr, 6) != 0) {
		printf("Warning: MAC addresses don't match:\n");
		printf("  ROM MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",
		       rom_enetaddr[0], rom_enetaddr[1],
		       rom_enetaddr[2], rom_enetaddr[3],
		       rom_enetaddr[4], rom_enetaddr[5]);
		printf("  \"ethaddr\" value: %02X:%02X:%02X:%02X:%02X:%02X\n",
		       env_enetaddr[0], env_enetaddr[1],
		       env_enetaddr[2], env_enetaddr[3],
		       env_enetaddr[4], env_enetaddr[5]) ;
		debug("### Using MAC address from environment\n");
	}
	if (!tmp) {
		char ethaddr[20];

		/* There is no MAC address in the environment, so we initialize
		 * it from the value in the ROM. */
		sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
			rom_enetaddr[0], rom_enetaddr[1],
			rom_enetaddr[2], rom_enetaddr[3],
			rom_enetaddr[4], rom_enetaddr[5]) ;
		debug("### Setting environment from ROM MAC address = \"%s\"\n",
		      ethaddr);
		setenv("ethaddr", ethaddr);
	}
}