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Date: Mon, 3 Jan 2011 19:51:06 +0800
From: "Guan Xuetao" <guanxuetao@...c.pku.edu.cn>
To: <linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCHv1 4/8] unicore32 additional architecture files: low-level lib: ocd debug
From: Guan Xuetao <guanxuetao@...c.pku.edu.cn>
Patch 4 implements low-level debug libraries with On-Chip-Debugger hardware support.
Signed-off-by: Guan Xuetao <guanxuetao@...c.pku.edu.cn>
---
arch/unicore32/include/asm/mach/debug-macro.S | 89 +++++++++++++++++++++++++
arch/unicore32/include/asm/mach/ocd.h | 36 ++++++++++
arch/unicore32/kernel/debug.S | 85 +++++++++++++++++++++++
arch/unicore32/kernel/early_printk.c | 59 ++++++++++++++++
4 files changed, 269 insertions(+), 0 deletions(-)
diff --git a/arch/unicore32/include/asm/mach/debug-macro.S b/arch/unicore32/include/asm/mach/debug-macro.S
new file mode 100644
index 0000000..b830d61
--- /dev/null
+++ b/arch/unicore32/include/asm/mach/debug-macro.S
@@ -0,0 +1,89 @@
+/*
+ * linux/arch/unicore32/include/asm/mach/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 <asm/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
+
diff --git a/arch/unicore32/include/asm/mach/ocd.h b/arch/unicore32/include/asm/mach/ocd.h
new file mode 100644
index 0000000..5342c5f
--- /dev/null
+++ b/arch/unicore32/include/asm/mach/ocd.h
@@ -0,0 +1,36 @@
+/*
+ * linux/arch/unicore32/include/asm/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
diff --git a/arch/unicore32/kernel/debug.S b/arch/unicore32/kernel/debug.S
new file mode 100644
index 0000000..290440c
--- /dev/null
+++ b/arch/unicore32/kernel/debug.S
@@ -0,0 +1,85 @@
+/*
+ * 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 <asm/mach/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
+
diff --git a/arch/unicore32/kernel/early_printk.c b/arch/unicore32/kernel/early_printk.c
new file mode 100644
index 0000000..6d98c2f
--- /dev/null
+++ b/arch/unicore32/kernel/early_printk.c
@@ -0,0 +1,59 @@
+/*
+ * 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 <asm/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);
--
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