unicore32 additional architecture files: low-level lib: ocd debug

This patch implements low-level debug libraries with On-Chip-Debugger hardware support.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
GuanXuetao 2011-01-15 18:22:19 +08:00
parent 6dea1ba1c8
commit 28bab059a2
4 changed files with 269 additions and 0 deletions

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/*
* linux/arch/unicore32/include/mach/ocd.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*/
#ifndef __MACH_PUV3_OCD_H__
#define __MACH_PUV3_OCD_H__
#if defined(CONFIG_DEBUG_OCD)
static inline void ocd_putc(unsigned int c)
{
int status, i = 0x2000000;
do {
if (--i < 0)
return;
asm volatile ("movc %0, p1.c0, #0" : "=r" (status));
} while (status & 2);
asm("movc p1.c1, %0, #1" : : "r" (c));
}
#define putc(ch) ocd_putc(ch)
#else
#define putc(ch)
#endif
#endif

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/*
* linux/arch/unicore32/kernel/debug-macro.S
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*
* Debugging macro include header
*/
#include <generated/asm-offsets.h>
#include <mach/hardware.h>
.macro put_word_ocd, rd, rx=r16
1001: movc \rx, p1.c0, #0
cand.a \rx, #2
bne 1001b
movc p1.c1, \rd, #1
.endm
#ifdef CONFIG_DEBUG_OCD
/* debug using UniCore On-Chip-Debugger */
.macro addruart, rx
.endm
.macro senduart, rd, rx
put_word_ocd \rd, \rx
.endm
.macro busyuart, rd, rx
.endm
.macro waituart, rd, rx
.endm
#else
#define UART_CLK_DEFAULT 3686400 * 20
/* Uartclk = MCLK/ 2, The MCLK on my board is 3686400 * 40 */
#define BAUD_RATE_DEFAULT 115200
/* The baud rate of the serial port */
#define UART_DIVISOR_DEFAULT (UART_CLK_DEFAULT \
/ (16 * BAUD_RATE_DEFAULT) - 1)
.macro addruart,rx
mrc p0, #0, \rx, c1, c0
tst \rx, #1 @ MMU enabled?
moveq \rx, #0xee000000 @ physical base address
movne \rx, #0x6e000000 @ virtual address
@ We probe for the active serial port here
@ However, now we assume UART0 is active: epip4d
@ We assume r1 and r2 can be clobbered.
movl r2, #UART_DIVISOR_DEFAULT
mov r1, #0x80
str r1, [\rx, #UART_LCR_OFFSET]
and r1, r2, #0xff00
mov r1, r1, lsr #8
str r1, [\rx, #UART_DLH_OFFSET]
and r1, r2, #0xff
str r1, [\rx, #UART_DLL_OFFSET]
mov r1, #0x7
str r1, [\rx, #UART_FCR_OFFSET]
mov r1, #0x3
str r1, [\rx, #UART_LCR_OFFSET]
mov r1, #0x0
str r1, [\rx, #UART_IER_OFFSET]
.endm
.macro senduart,rd,rx
str \rd, [\rx, #UART_THR_OFFSET]
.endm
.macro waituart,rd,rx
1001: ldr \rd, [\rx, #UART_LSR_OFFSET]
tst \rd, #UART_LSR_THRE
beq 1001b
.endm
.macro busyuart,rd,rx
1001: ldr \rd, [\rx, #UART_LSR_OFFSET]
tst \rd, #UART_LSR_TEMT
bne 1001b
.endm
#endif

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/*
* linux/arch/unicore32/kernel/debug.S
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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.
*
* 32-bit debugging code
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
.text
/*
* Some debugging routines (useful if you've got MM problems and
* printk isn't working). For DEBUGGING ONLY!!! Do not leave
* references to these in a production kernel!
*/
#include "debug-macro.S"
/*
* Useful debugging routines
*/
ENTRY(printhex8)
mov r1, #8
b printhex
ENDPROC(printhex8)
ENTRY(printhex4)
mov r1, #4
b printhex
ENDPROC(printhex4)
ENTRY(printhex2)
mov r1, #2
printhex: adr r2, hexbuf
add r3, r2, r1
mov r1, #0
stb r1, [r3]
1: and r1, r0, #15
mov r0, r0 >> #4
csub.a r1, #10
beg 2f
add r1, r1, #'0' - 'a' + 10
2: add r1, r1, #'a' - 10
stb.w r1, [r3+], #-1
cxor.a r3, r2
bne 1b
mov r0, r2
b printascii
ENDPROC(printhex2)
.ltorg
ENTRY(printascii)
addruart r3
b 2f
1: waituart r2, r3
senduart r1, r3
busyuart r2, r3
cxor.a r1, #'\n'
cmoveq r1, #'\r'
beq 1b
2: cxor.a r0, #0
beq 3f
ldb.w r1, [r0]+, #1
cxor.a r1, #0
bne 1b
3: mov pc, lr
ENDPROC(printascii)
ENTRY(printch)
addruart r3
mov r1, r0
mov r0, #0
b 1b
ENDPROC(printch)
hexbuf: .space 16

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/*
* linux/arch/unicore32/kernel/early_printk.c
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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 <linux/console.h>
#include <linux/init.h>
#include <linux/string.h>
#include <mach/ocd.h>
/* On-Chip-Debugger functions */
static void early_ocd_write(struct console *con, const char *s, unsigned n)
{
while (*s && n-- > 0) {
if (*s == '\n')
ocd_putc((int)'\r');
ocd_putc((int)*s);
s++;
}
}
static struct console early_ocd_console = {
.name = "earlyocd",
.write = early_ocd_write,
.flags = CON_PRINTBUFFER,
.index = -1,
};
/* Direct interface for emergencies */
static struct console *early_console = &early_ocd_console;
static int __initdata keep_early;
static int __init setup_early_printk(char *buf)
{
if (!buf)
return 0;
if (strstr(buf, "keep"))
keep_early = 1;
if (!strncmp(buf, "ocd", 3))
early_console = &early_ocd_console;
if (keep_early)
early_console->flags &= ~CON_BOOT;
else
early_console->flags |= CON_BOOT;
register_console(early_console);
return 0;
}
early_param("earlyprintk", setup_early_printk);