arch/powerpc/sysdev/cpm_common.c

/*
 * Common CPM code
 *
 * Author: Scott Wood <scottwood@freescale.com>
 *
 * Copyright 2007 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <asm/udbg.h>
#include <asm/io.h>
#include <asm/system.h>
#include <mm/mmu_decl.h>

#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
static u32 __iomem *cpm_udbg_txdesc =
	(u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;

static void udbg_putc_cpm(char c)
{
	u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);

	if (c == '\n')
		udbg_putc('\r');

	while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
		;

	out_8(txbuf, c);
	out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
}

void __init udbg_init_cpm(void)
{
	if (cpm_udbg_txdesc) {
#ifdef CONFIG_CPM2
		setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
#endif
		udbg_putc = udbg_putc_cpm;
	}
}
#endif