powerpc/virtex: Fix booting of Xilinx FPGAs with 16550 for 405 and 440

		fixed-head.S ep88xc.c ep405.c cuboot-c2k.c \

		cuboot-katmai.c cuboot-rainier.c redboot-8xx.c ep8248e.c \

		cuboot-warp.c cuboot-85xx-cpm2.c cuboot-yosemite.c simpleboot.c \

		virtex405-head.S redboot-83xx.c cuboot-sam440ep.c

		virtex405-head.S virtex.c redboot-83xx.c cuboot-sam440ep.c

src-boot := $(src-wlib) $(src-plat) empty.c

src-boot := $(addprefix $(obj)/, $(src-boot))

BSS_STACK(4*1024);

extern int platform_specific_init(void) __attribute__((weak));

void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,

		   unsigned long r6, unsigned long r7)

{

	/* prepare the device tree and find the console */

	fdt_init(_dtb_start);

	if (platform_specific_init)

		platform_specific_init();

	serial_console_init();

}

/*

 * The platform specific code for virtex devices since a boot loader is not

 * always used.

 *

 * (C) Copyright 2008 Xilinx, Inc.

 *

 * 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.

 */

#include "ops.h"

#include "io.h"

#include "stdio.h"

#define UART_DLL		0	/* Out: Divisor Latch Low */

#define UART_DLM		1	/* Out: Divisor Latch High */

#define UART_FCR		2	/* Out: FIFO Control Register */

#define UART_FCR_CLEAR_RCVR 	0x02 	/* Clear the RCVR FIFO */

#define UART_FCR_CLEAR_XMIT	0x04 	/* Clear the XMIT FIFO */

#define UART_LCR		3	/* Out: Line Control Register */

#define UART_MCR		4	/* Out: Modem Control Register */

#define UART_MCR_RTS		0x02 	/* RTS complement */

#define UART_MCR_DTR		0x01 	/* DTR complement */

#define UART_LCR_DLAB		0x80 	/* Divisor latch access bit */

#define UART_LCR_WLEN8		0x03 	/* Wordlength: 8 bits */

static int virtex_ns16550_console_init(void *devp)

{

	unsigned char *reg_base;

	u32 reg_shift, reg_offset, clk, spd;

	u16 divisor;

	int n;

	if (dt_get_virtual_reg(devp, (void **)&reg_base, 1) < 1)

		return -1;

	n = getprop(devp, "reg-offset", &reg_offset, sizeof(reg_offset));

	if (n == sizeof(reg_offset))

		reg_base += reg_offset;

	n = getprop(devp, "reg-shift", &reg_shift, sizeof(reg_shift));

	if (n != sizeof(reg_shift))

		reg_shift = 0;

	n = getprop(devp, "current-speed", (void *)&spd, sizeof(spd));

	if (n != sizeof(spd))

		spd = 9600;

	/* should there be a default clock rate?*/

	n = getprop(devp, "clock-frequency", (void *)&clk, sizeof(clk));

	if (n != sizeof(clk))

		return -1;

	divisor = clk / (16 * spd);

	/* Access baud rate */

	out_8(reg_base + (UART_LCR << reg_shift), UART_LCR_DLAB);

	/* Baud rate based on input clock */

	out_8(reg_base + (UART_DLL << reg_shift), divisor & 0xFF);

	out_8(reg_base + (UART_DLM << reg_shift), divisor >> 8);

	/* 8 data, 1 stop, no parity */

	out_8(reg_base + (UART_LCR << reg_shift), UART_LCR_WLEN8);

	/* RTS/DTR */

	out_8(reg_base + (UART_MCR << reg_shift), UART_MCR_RTS | UART_MCR_DTR);

	/* Clear transmitter and receiver */

	out_8(reg_base + (UART_FCR << reg_shift),

				UART_FCR_CLEAR_XMIT | UART_FCR_CLEAR_RCVR);

	return 0;

}

/* For virtex, the kernel may be loaded without using a bootloader and if so

   some UARTs need more setup than is provided in the normal console init

*/

int platform_specific_init(void)

{

	void *devp;

	char devtype[MAX_PROP_LEN];

	char path[MAX_PATH_LEN];

	devp = finddevice("/chosen");

	if (devp == NULL)

		return -1;

	if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0) {

		devp = finddevice(path);

		if (devp == NULL)

			return -1;

		if ((getprop(devp, "device_type", devtype, sizeof(devtype)) > 0)

				&& !strcmp(devtype, "serial")

				&& (dt_is_compatible(devp, "ns16550")))

				virtex_ns16550_console_init(devp);

	}

	return 0;

}

    binary=y

    ;;

simpleboot-virtex405-*)

    platformo="$object/virtex405-head.o $object/simpleboot.o"

    platformo="$object/virtex405-head.o $object/simpleboot.o $object/virtex.o"

    binary=y

    ;;

simpleboot-virtex440-*)

    platformo="$object/simpleboot.o $object/virtex.o"

    binary=y

    ;;

asp834x-redboot)