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[POWERPC] Add early debug console for CPM serial ports.

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This code assumes that the ports have been previously set up, with
buffers in DPRAM.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Scott Wood 2007-07-16 11:43:43 -05:00 • committed by Kumar Gala
parent e631ae3b16
commit c374e00e17
8 changed files with 92 additions and 0 deletions
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46
arch/powerpc/sysdev/cpm_common.c Normal file
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/*
* 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