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>
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GuanXuetao
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/*
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* linux/arch/unicore32/include/mach/ocd.h
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __MACH_PUV3_OCD_H__
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#define __MACH_PUV3_OCD_H__
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#if defined(CONFIG_DEBUG_OCD)
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static inline void ocd_putc(unsigned int c)
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{
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int status, i = 0x2000000;
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do {
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if (--i < 0)
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return;
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asm volatile ("movc %0, p1.c0, #0" : "=r" (status));
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} while (status & 2);
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asm("movc p1.c1, %0, #1" : : "r" (c));
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}
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#define putc(ch) ocd_putc(ch)
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#else
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#define putc(ch)
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#endif
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#endif
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@ -0,0 +1,89 @@
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/*
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* linux/arch/unicore32/kernel/debug-macro.S
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Debugging macro include header
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*/
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#include <generated/asm-offsets.h>
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#include <mach/hardware.h>
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.macro put_word_ocd, rd, rx=r16
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1001: movc \rx, p1.c0, #0
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cand.a \rx, #2
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bne 1001b
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movc p1.c1, \rd, #1
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.endm
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#ifdef CONFIG_DEBUG_OCD
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/* debug using UniCore On-Chip-Debugger */
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.macro addruart, rx
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.endm
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.macro senduart, rd, rx
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put_word_ocd \rd, \rx
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.endm
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.macro busyuart, rd, rx
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.endm
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.macro waituart, rd, rx
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.endm
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#else
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#define UART_CLK_DEFAULT 3686400 * 20
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/* Uartclk = MCLK/ 2, The MCLK on my board is 3686400 * 40 */
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#define BAUD_RATE_DEFAULT 115200
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/* The baud rate of the serial port */
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#define UART_DIVISOR_DEFAULT (UART_CLK_DEFAULT \
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/ (16 * BAUD_RATE_DEFAULT) - 1)
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.macro addruart,rx
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mrc p0, #0, \rx, c1, c0
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tst \rx, #1 @ MMU enabled?
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moveq \rx, #0xee000000 @ physical base address
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movne \rx, #0x6e000000 @ virtual address
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@ We probe for the active serial port here
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@ However, now we assume UART0 is active: epip4d
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@ We assume r1 and r2 can be clobbered.
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movl r2, #UART_DIVISOR_DEFAULT
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mov r1, #0x80
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str r1, [\rx, #UART_LCR_OFFSET]
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and r1, r2, #0xff00
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mov r1, r1, lsr #8
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str r1, [\rx, #UART_DLH_OFFSET]
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and r1, r2, #0xff
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str r1, [\rx, #UART_DLL_OFFSET]
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mov r1, #0x7
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str r1, [\rx, #UART_FCR_OFFSET]
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mov r1, #0x3
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str r1, [\rx, #UART_LCR_OFFSET]
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mov r1, #0x0
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str r1, [\rx, #UART_IER_OFFSET]
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.endm
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.macro senduart,rd,rx
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str \rd, [\rx, #UART_THR_OFFSET]
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.endm
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.macro waituart,rd,rx
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1001: ldr \rd, [\rx, #UART_LSR_OFFSET]
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tst \rd, #UART_LSR_THRE
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beq 1001b
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.endm
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.macro busyuart,rd,rx
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1001: ldr \rd, [\rx, #UART_LSR_OFFSET]
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tst \rd, #UART_LSR_TEMT
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bne 1001b
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.endm
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#endif
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@ -0,0 +1,85 @@
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/*
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* linux/arch/unicore32/kernel/debug.S
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* 32-bit debugging code
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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.text
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/*
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* Some debugging routines (useful if you've got MM problems and
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* printk isn't working). For DEBUGGING ONLY!!! Do not leave
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* references to these in a production kernel!
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*/
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#include "debug-macro.S"
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/*
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* Useful debugging routines
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*/
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ENTRY(printhex8)
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mov r1, #8
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b printhex
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ENDPROC(printhex8)
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ENTRY(printhex4)
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mov r1, #4
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b printhex
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ENDPROC(printhex4)
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ENTRY(printhex2)
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mov r1, #2
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printhex: adr r2, hexbuf
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add r3, r2, r1
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mov r1, #0
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stb r1, [r3]
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1: and r1, r0, #15
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mov r0, r0 >> #4
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csub.a r1, #10
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beg 2f
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add r1, r1, #'0' - 'a' + 10
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2: add r1, r1, #'a' - 10
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stb.w r1, [r3+], #-1
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cxor.a r3, r2
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bne 1b
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mov r0, r2
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b printascii
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ENDPROC(printhex2)
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.ltorg
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ENTRY(printascii)
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addruart r3
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b 2f
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1: waituart r2, r3
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senduart r1, r3
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busyuart r2, r3
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cxor.a r1, #'\n'
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cmoveq r1, #'\r'
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beq 1b
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2: cxor.a r0, #0
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beq 3f
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ldb.w r1, [r0]+, #1
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cxor.a r1, #0
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bne 1b
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3: mov pc, lr
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ENDPROC(printascii)
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ENTRY(printch)
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addruart r3
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mov r1, r0
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mov r0, #0
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b 1b
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ENDPROC(printch)
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hexbuf: .space 16
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@ -0,0 +1,59 @@
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/*
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* linux/arch/unicore32/kernel/early_printk.c
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <mach/ocd.h>
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/* On-Chip-Debugger functions */
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static void early_ocd_write(struct console *con, const char *s, unsigned n)
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{
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while (*s && n-- > 0) {
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if (*s == '\n')
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ocd_putc((int)'\r');
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ocd_putc((int)*s);
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s++;
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}
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}
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static struct console early_ocd_console = {
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.name = "earlyocd",
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.write = early_ocd_write,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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/* Direct interface for emergencies */
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static struct console *early_console = &early_ocd_console;
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static int __initdata keep_early;
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static int __init setup_early_printk(char *buf)
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{
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if (!buf)
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return 0;
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if (strstr(buf, "keep"))
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keep_early = 1;
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if (!strncmp(buf, "ocd", 3))
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early_console = &early_ocd_console;
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if (keep_early)
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early_console->flags &= ~CON_BOOT;
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else
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early_console->flags |= CON_BOOT;
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register_console(early_console);
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return 0;
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}
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early_param("earlyprintk", setup_early_printk);
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