korat.c

uboot详细解读可用启动引导LINUX2.6内核

/*
 * (C) Copyright 2007-2008
 * Larry Johnson, [e-mail]
 *
 * (C) Copyright 2006-2007
 * Stefan Roese, DENX Software Engineering, [e-mail].
 *
 * (C) Copyright 2006
 * Jacqueline Pira-Ferriol, AMCC/IBM, [e-mail]
 * Alain Saurel,	    AMCC/IBM, [e-mail]
 *
 * 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 <fdt_support.h>
#include <i2c.h>
#include <libfdt.h>
#include <ppc440.h>
#include <asm/bitops.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/ppc4xx-intvec.h>
#include <asm/processor.h>

DECLARE_GLOBAL_DATA_PTR;

extern flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */

ulong flash_get_size(ulong base, int banknum);

#if defined(CONFIG_KORAT_PERMANENT)
void korat_buzzer(int const on)
{
	if (on) {
		out_8((u8 *) CFG_CPLD_BASE + 0x05,
		      in_8((u8 *) CFG_CPLD_BASE + 0x05) | 0x80);
	} else {
		out_8((u8 *) CFG_CPLD_BASE + 0x05,
		      in_8((u8 *) CFG_CPLD_BASE + 0x05) & ~0x80);
	}
}
#endif

int board_early_init_f(void)
{
	uint32_t sdr0_pfc1, sdr0_pfc2;
	uint32_t reg;
	int eth;

#if defined(CONFIG_KORAT_PERMANENT)
	unsigned mscount;

	extern void korat_branch_absolute(uint32_t addr);

	for (mscount = 0;  mscount < CFG_KORAT_MAN_RESET_MS; ++mscount) {
		udelay(1000);
		if (gpio_read_in_bit(CFG_GPIO_RESET_PRESSED_)) {
			/* This call does not return. */
			korat_branch_absolute(
				CFG_FLASH1_TOP - 2 * CFG_ENV_SECT_SIZE - 4);
		}
	}
	korat_buzzer(1);
	while (!gpio_read_in_bit(CFG_GPIO_RESET_PRESSED_))
		udelay(1000);

	korat_buzzer(0);
#endif

	mtdcr(ebccfga, xbcfg);
	mtdcr(ebccfgd, 0xb8400000);

	/*
	 * Setup the interrupt controller polarities, triggers, etc.
	 */
	mtdcr(uic0sr, 0xffffffff);	/* clear all */
	mtdcr(uic0er, 0x00000000);	/* disable all */
	mtdcr(uic0cr, 0x00000005);	/* ATI & UIC1 crit are critical */
	mtdcr(uic0pr, 0xfffff7ff);	/* per ref-board manual */
	mtdcr(uic0tr, 0x00000000);	/* per ref-board manual */
	mtdcr(uic0vr, 0x00000000);	/* int31 highest, base=0x000 */
	mtdcr(uic0sr, 0xffffffff);	/* clear all */

	mtdcr(uic1sr, 0xffffffff);	/* clear all */
	mtdcr(uic1er, 0x00000000);	/* disable all */
	mtdcr(uic1cr, 0x00000000);	/* all non-critical */
	mtdcr(uic1pr, 0xffffffff);	/* per ref-board manual */
	mtdcr(uic1tr, 0x00000000);	/* per ref-board manual */
	mtdcr(uic1vr, 0x00000000);	/* int31 highest, base=0x000 */
	mtdcr(uic1sr, 0xffffffff);	/* clear all */

	mtdcr(uic2sr, 0xffffffff);	/* clear all */
	mtdcr(uic2er, 0x00000000);	/* disable all */
	mtdcr(uic2cr, 0x00000000);	/* all non-critical */
	mtdcr(uic2pr, 0xffffffff);	/* per ref-board manual */
	mtdcr(uic2tr, 0x00000000);	/* per ref-board manual */
	mtdcr(uic2vr, 0x00000000);	/* int31 highest, base=0x000 */
	mtdcr(uic2sr, 0xffffffff);	/* clear all */

	/*
	 * Take sim card reader and CF controller out of reset.  Also enable PHY
	 * auto-detect until board-specific PHY resets are available.
	 */
	out_8((u8 *) CFG_CPLD_BASE + 0x02, 0xC0);

	/* Configure the two Ethernet PHYs.  For each PHY, configure for fiber
	 * if the SFP module is present, and for copper if it is not present.
	 */
	for (eth = 0; eth < 2; ++eth) {
		if (gpio_read_in_bit(CFG_GPIO_SFP0_PRESENT_ + eth)) {
			/* SFP module not present: configure PHY for copper. */
			/* Set PHY to autonegotate 10 MB, 100MB, or 1 GB */
			out_8((u8 *) CFG_CPLD_BASE + 0x03,
			      in_8((u8 *) CFG_CPLD_BASE + 0x03) |
			      0x06 << (4 * eth));
		} else {
			/* SFP module present: configure PHY for fiber and
			   enable output */
			gpio_write_bit(CFG_GPIO_PHY0_FIBER_SEL + eth, 1);
			gpio_write_bit(CFG_GPIO_SFP0_TX_EN_ + eth, 0);
		}
	}
	/* enable Ethernet: set GPIO45 and GPIO46 to 1 */
	gpio_write_bit(CFG_GPIO_PHY0_EN, 1);
	gpio_write_bit(CFG_GPIO_PHY1_EN, 1);

	/* Wait 1 ms, then enable Fiber signal detect to PHYs. */
	udelay(1000);
	out_8((u8 *) CFG_CPLD_BASE + 0x03,
	      in_8((u8 *) CFG_CPLD_BASE + 0x03) | 0x88);

	/* select Ethernet (and optionally IIC1) pins */
	mfsdr(SDR0_PFC1, sdr0_pfc1);
	sdr0_pfc1 = (sdr0_pfc1 & ~SDR0_PFC1_SELECT_MASK) |
		SDR0_PFC1_SELECT_CONFIG_4;
#ifdef CONFIG_I2C_MULTI_BUS
	sdr0_pfc1 |= ((sdr0_pfc1 & ~SDR0_PFC1_SIS_MASK) | SDR0_PFC1_SIS_IIC1_SEL);
#endif
	mfsdr(SDR0_PFC2, sdr0_pfc2);
	sdr0_pfc2 = (sdr0_pfc2 & ~SDR0_PFC2_SELECT_MASK) |
		SDR0_PFC2_SELECT_CONFIG_4;
	mtsdr(SDR0_PFC2, sdr0_pfc2);
	mtsdr(SDR0_PFC1, sdr0_pfc1);

	/* PCI arbiter enabled */
	mfsdr(sdr_pci0, reg);
	mtsdr(sdr_pci0, 0x80000000 | reg);

	return 0;
}

/*
 * The boot flash on CS0 normally has its write-enable pin disabled, and so will
 * not respond to CFI commands.  This routine therefore fills in the flash
 * information for the boot flash.  (The flash at CS1 operates normally.)
 */
ulong board_flash_get_legacy (ulong base, int banknum, flash_info_t * info)
{
	uint32_t addr;
	int i;

	if (1 != banknum)
		return 0;

	info->size		= CFG_FLASH0_SIZE;
	info->sector_count	= CFG_FLASH0_SIZE / 0x20000;
	info->flash_id		= 0x01000000;
	info->portwidth		= 2;
	info->chipwidth		= 2;
	info->buffer_size	= 32;
	info->erase_blk_tout	= 16384;
	info->write_tout	= 2;
	info->buffer_write_tout	= 5;
	info->vendor		= 2;
	info->cmd_reset		= 0x00F0;
	info->interface		= 2;
	info->legacy_unlock	= 0;
	info->manufacturer_id	= 1;
	info->device_id		= 0x007E;

#if CFG_FLASH0_SIZE == 0x01000000
	info->device_id2	= 0x2101;
#elif CFG_FLASH0_SIZE == 0x04000000
	info->device_id2	= 0x2301;
#else
#error Unable to set device_id2 for current CFG_FLASH0_SIZE
#endif

	info->ext_addr		= 0x0040;
	info->cfi_version	= 0x3133;
	info->cfi_offset	= 0x0055;
	info->addr_unlock1	= 0x00000555;
	info->addr_unlock2	= 0x000002AA;
	info->name		= "CFI conformant";
	for (i = 0, addr = -info->size;
	     i < info->sector_count;
	     ++i, addr += 0x20000) {
		info->start[i] = addr;
		info->protect[i] = 0x00;
	}
	return 1;
}

static int man_data_read(unsigned int addr)
{
	/*
	 * Read an octet of data from address "addr" in the manufacturer's
	 * information serial EEPROM, or -1 on error.
	 */
	u8 data[2];

	if (0 != i2c_probe(MAN_DATA_EEPROM_ADDR) ||
	    0 != i2c_read(MAN_DATA_EEPROM_ADDR, addr, 1, data, 1)) {
		debug("man_data_read(0x%02X) failed\n", addr);
		return -1;
	}
	debug("man_info_read(0x%02X) returned 0x%02X\n", addr, data[0]);
	return data[0];
}

static unsigned int man_data_field_addr(unsigned int const field)
{
	/*
	 * The manufacturer's information serial EEPROM contains a sequence of
	 * zero-delimited fields.  Return the starting address of field "field",
	 * or 0 on error.
	 */
	unsigned addr, i;

	if (0 == field || 'A' != man_data_read(0) || '\0' != man_data_read(1))
		/* Only format "A" is currently supported */
		return 0;

	for (addr = 2, i = 1; i < field && addr < 256; ++addr) {
		if ('\0' == man_data_read(addr))
			++i;
	}
	return (addr < 256) ? addr : 0;
}

static char *man_data_read_field(char s[], unsigned const field,
				 unsigned const length)
{
	/*
	 * Place the null-terminated contents of field "field" of length
	 * "length" from the manufacturer's information serial EEPROM into
	 * string "s[length + 1]" and return a pointer to s, or return 0 on
	 * error. In either case the original contents of s[] is not preserved.
	 */
	unsigned addr, i;

	addr = man_data_field_addr(field);
	if (0 == addr || addr + length >= 255)
		return 0;

	for (i = 0; i < length; ++i) {
		int const c = man_data_read(addr++);

		if (c <= 0)
			return 0;

		s[i] = (char)c;
	}
	if (0 != man_data_read(addr))
		return 0;

	s[i] = '\0';
	return s;
}

static void set_serial_number(void)
{
	/*
	 * If the environmental variable "serial#" is not set, try to set it
	 * from the manufacturer's information serial EEPROM.
	 */
	char s[MAN_INFO_LENGTH + MAN_MAC_ADDR_LENGTH + 2];

	if (getenv("serial#"))
		return;

	if (!man_data_read_field(s, MAN_INFO_FIELD, MAN_INFO_LENGTH))
		return;

	s[MAN_INFO_LENGTH] = '-';
	if (!man_data_read_field(s + MAN_INFO_LENGTH + 1, MAN_MAC_ADDR_FIELD,
				 MAN_MAC_ADDR_LENGTH))
		return;

	setenv("serial#", s);
}

static void set_mac_addresses(void)
{
	/*
	 * If the environmental variables "ethaddr" and/or "eth1addr" are not
	 * set, try to set them from the manufacturer's information serial
	 * EEPROM.
	 */

#if MAN_MAC_ADDR_LENGTH % 2 != 0
#error MAN_MAC_ADDR_LENGTH must be an even number
#endif

	char s[(3 * MAN_MAC_ADDR_LENGTH) / 2];
	char *src;
	char *dst;

	if (0 != getenv("ethaddr") && 0 != getenv("eth1addr"))
		return;

	if (0 == man_data_read_field(s + (MAN_MAC_ADDR_LENGTH / 2) - 1,
				     MAN_MAC_ADDR_FIELD, MAN_MAC_ADDR_LENGTH))
		return;

	for (src = s + (MAN_MAC_ADDR_LENGTH / 2) - 1, dst = s; src != dst;) {
		*dst++ = *src++;
		*dst++ = *src++;
		*dst++ = ':';
	}
	if (0 == getenv("ethaddr"))
		setenv("ethaddr", s);

	if (0 == getenv("eth1addr")) {
		++s[((3 * MAN_MAC_ADDR_LENGTH) / 2) - 2];
		setenv("eth1addr", s);
	}
}

int misc_init_r(void)
{
	uint32_t pbcr;
	int size_val;
	uint32_t reg;
	unsigned long usb2d0cr = 0;
	unsigned long usb2phy0cr, usb2h0cr = 0;
	unsigned long sdr0_pfc1;
	uint32_t const flash1_size = gd->bd->bi_flashsize - CFG_FLASH0_SIZE;
	char const *const act = getenv("usbact");

	/*
	 * Re-do FLASH1 sizing and adjust flash start and offset.
	 */
	gd->bd->bi_flashstart = CFG_FLASH1_TOP - flash1_size;
	gd->bd->bi_flashoffset = 0;

	mtdcr(ebccfga, pb1cr);
	pbcr = mfdcr(ebccfgd);
	size_val = ffs(flash1_size) - 21;
	pbcr = (pbcr & 0x0001ffff) | gd->bd->bi_flashstart | (size_val << 17);
	mtdcr(ebccfga, pb1cr);
	mtdcr(ebccfgd, pbcr);

	/*
	 * Re-check to get correct base address
	 */
	flash_get_size(gd->bd->bi_flashstart, 0);

	/*
	 * Re-do FLASH1 sizing and adjust flash offset to reserve space for
	 * environment
	 */
	gd->bd->bi_flashoffset =
		CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - CFG_FLASH1_ADDR;

	mtdcr(ebccfga, pb1cr);
	pbcr = mfdcr(ebccfgd);
	size_val = ffs(gd->bd->bi_flashsize - CFG_FLASH0_SIZE) - 21;
	pbcr = (pbcr & 0x0001ffff) | gd->bd->bi_flashstart | (size_val << 17);
	mtdcr(ebccfga, pb1cr);
	mtdcr(ebccfgd, pbcr);

	/* Monitor protection ON by default */
#if defined(CONFIG_KORAT_PERMANENT)
	(void)flash_protect(FLAG_PROTECT_SET, CFG_MONITOR_BASE,
			    CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1,
			    flash_info + 1);