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authorGuanXuetao <gxt@mprc.pku.edu.cn>2011-01-15 05:22:19 -0500
committerGuanXuetao <gxt@mprc.pku.edu.cn>2011-03-16 21:19:12 -0400
commit28bab059a23aac6bb129b307410e5b63e132a290 (patch)
tree574dc1cf3a7fd6c0744e8c2a5fdc7f49e94d4733 /arch/unicore32
parent6dea1ba1c82013c108d235ec32c6d8bd9ff6b48d (diff)
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>
Diffstat (limited to 'arch/unicore32')
-rw-r--r--arch/unicore32/include/mach/ocd.h36
-rw-r--r--arch/unicore32/kernel/debug-macro.S89
-rw-r--r--arch/unicore32/kernel/debug.S85
-rw-r--r--arch/unicore32/kernel/early_printk.c59
4 files changed, 269 insertions, 0 deletions
diff --git a/arch/unicore32/include/mach/ocd.h b/arch/unicore32/include/mach/ocd.h
new file mode 100644
index 000000000000..189fd71bfa34
--- /dev/null
+++ b/arch/unicore32/include/mach/ocd.h
@@ -0,0 +1,36 @@
1/*
2 * linux/arch/unicore32/include/mach/ocd.h
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#ifndef __MACH_PUV3_OCD_H__
14#define __MACH_PUV3_OCD_H__
15
16#if defined(CONFIG_DEBUG_OCD)
17static inline void ocd_putc(unsigned int c)
18{
19 int status, i = 0x2000000;
20
21 do {
22 if (--i < 0)
23 return;
24
25 asm volatile ("movc %0, p1.c0, #0" : "=r" (status));
26 } while (status & 2);
27
28 asm("movc p1.c1, %0, #1" : : "r" (c));
29}
30
31#define putc(ch) ocd_putc(ch)
32#else
33#define putc(ch)
34#endif
35
36#endif
diff --git a/arch/unicore32/kernel/debug-macro.S b/arch/unicore32/kernel/debug-macro.S
new file mode 100644
index 000000000000..2711d6d87d8e
--- /dev/null
+++ b/arch/unicore32/kernel/debug-macro.S
@@ -0,0 +1,89 @@
1/*
2 * linux/arch/unicore32/kernel/debug-macro.S
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * Debugging macro include header
13 */
14#include <generated/asm-offsets.h>
15#include <mach/hardware.h>
16
17 .macro put_word_ocd, rd, rx=r16
181001: movc \rx, p1.c0, #0
19 cand.a \rx, #2
20 bne 1001b
21 movc p1.c1, \rd, #1
22 .endm
23
24#ifdef CONFIG_DEBUG_OCD
25 /* debug using UniCore On-Chip-Debugger */
26 .macro addruart, rx
27 .endm
28
29 .macro senduart, rd, rx
30 put_word_ocd \rd, \rx
31 .endm
32
33 .macro busyuart, rd, rx
34 .endm
35
36 .macro waituart, rd, rx
37 .endm
38#else
39#define UART_CLK_DEFAULT 3686400 * 20
40 /* Uartclk = MCLK/ 2, The MCLK on my board is 3686400 * 40 */
41#define BAUD_RATE_DEFAULT 115200
42 /* The baud rate of the serial port */
43
44#define UART_DIVISOR_DEFAULT (UART_CLK_DEFAULT \
45 / (16 * BAUD_RATE_DEFAULT) - 1)
46
47 .macro addruart,rx
48 mrc p0, #0, \rx, c1, c0
49 tst \rx, #1 @ MMU enabled?
50 moveq \rx, #0xee000000 @ physical base address
51 movne \rx, #0x6e000000 @ virtual address
52
53 @ We probe for the active serial port here
54 @ However, now we assume UART0 is active: epip4d
55 @ We assume r1 and r2 can be clobbered.
56
57 movl r2, #UART_DIVISOR_DEFAULT
58 mov r1, #0x80
59 str r1, [\rx, #UART_LCR_OFFSET]
60 and r1, r2, #0xff00
61 mov r1, r1, lsr #8
62 str r1, [\rx, #UART_DLH_OFFSET]
63 and r1, r2, #0xff
64 str r1, [\rx, #UART_DLL_OFFSET]
65 mov r1, #0x7
66 str r1, [\rx, #UART_FCR_OFFSET]
67 mov r1, #0x3
68 str r1, [\rx, #UART_LCR_OFFSET]
69 mov r1, #0x0
70 str r1, [\rx, #UART_IER_OFFSET]
71 .endm
72
73 .macro senduart,rd,rx
74 str \rd, [\rx, #UART_THR_OFFSET]
75 .endm
76
77 .macro waituart,rd,rx
781001: ldr \rd, [\rx, #UART_LSR_OFFSET]
79 tst \rd, #UART_LSR_THRE
80 beq 1001b
81 .endm
82
83 .macro busyuart,rd,rx
841001: ldr \rd, [\rx, #UART_LSR_OFFSET]
85 tst \rd, #UART_LSR_TEMT
86 bne 1001b
87 .endm
88#endif
89
diff --git a/arch/unicore32/kernel/debug.S b/arch/unicore32/kernel/debug.S
new file mode 100644
index 000000000000..029fd12f6ab0
--- /dev/null
+++ b/arch/unicore32/kernel/debug.S
@@ -0,0 +1,85 @@
1/*
2 * linux/arch/unicore32/kernel/debug.S
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * 32-bit debugging code
13 */
14#include <linux/linkage.h>
15#include <asm/assembler.h>
16
17 .text
18
19/*
20 * Some debugging routines (useful if you've got MM problems and
21 * printk isn't working). For DEBUGGING ONLY!!! Do not leave
22 * references to these in a production kernel!
23 */
24#include "debug-macro.S"
25
26/*
27 * Useful debugging routines
28 */
29ENTRY(printhex8)
30 mov r1, #8
31 b printhex
32ENDPROC(printhex8)
33
34ENTRY(printhex4)
35 mov r1, #4
36 b printhex
37ENDPROC(printhex4)
38
39ENTRY(printhex2)
40 mov r1, #2
41printhex: adr r2, hexbuf
42 add r3, r2, r1
43 mov r1, #0
44 stb r1, [r3]
451: and r1, r0, #15
46 mov r0, r0 >> #4
47 csub.a r1, #10
48 beg 2f
49 add r1, r1, #'0' - 'a' + 10
502: add r1, r1, #'a' - 10
51 stb.w r1, [r3+], #-1
52 cxor.a r3, r2
53 bne 1b
54 mov r0, r2
55 b printascii
56ENDPROC(printhex2)
57
58 .ltorg
59
60ENTRY(printascii)
61 addruart r3
62 b 2f
631: waituart r2, r3
64 senduart r1, r3
65 busyuart r2, r3
66 cxor.a r1, #'\n'
67 cmoveq r1, #'\r'
68 beq 1b
692: cxor.a r0, #0
70 beq 3f
71 ldb.w r1, [r0]+, #1
72 cxor.a r1, #0
73 bne 1b
743: mov pc, lr
75ENDPROC(printascii)
76
77ENTRY(printch)
78 addruart r3
79 mov r1, r0
80 mov r0, #0
81 b 1b
82ENDPROC(printch)
83
84hexbuf: .space 16
85
diff --git a/arch/unicore32/kernel/early_printk.c b/arch/unicore32/kernel/early_printk.c
new file mode 100644
index 000000000000..3922255f1fa8
--- /dev/null
+++ b/arch/unicore32/kernel/early_printk.c
@@ -0,0 +1,59 @@
1/*
2 * linux/arch/unicore32/kernel/early_printk.c
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/console.h>
13#include <linux/init.h>
14#include <linux/string.h>
15#include <mach/ocd.h>
16
17/* On-Chip-Debugger functions */
18
19static void early_ocd_write(struct console *con, const char *s, unsigned n)
20{
21 while (*s && n-- > 0) {
22 if (*s == '\n')
23 ocd_putc((int)'\r');
24 ocd_putc((int)*s);
25 s++;
26 }
27}
28
29static struct console early_ocd_console = {
30 .name = "earlyocd",
31 .write = early_ocd_write,
32 .flags = CON_PRINTBUFFER,
33 .index = -1,
34};
35
36/* Direct interface for emergencies */
37static struct console *early_console = &early_ocd_console;
38
39static int __initdata keep_early;
40
41static int __init setup_early_printk(char *buf)
42{
43 if (!buf)
44 return 0;
45
46 if (strstr(buf, "keep"))
47 keep_early = 1;
48
49 if (!strncmp(buf, "ocd", 3))
50 early_console = &early_ocd_console;
51
52 if (keep_early)
53 early_console->flags &= ~CON_BOOT;
54 else
55 early_console->flags |= CON_BOOT;
56 register_console(early_console);
57 return 0;
58}
59early_param("earlyprintk", setup_early_printk);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-27 14:06:16 -0500