diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm/Kconfig.debug | 64 | ||||
| -rw-r--r-- | arch/arm/include/asm/macro.h | 2 | ||||
| -rw-r--r-- | arch/arm/include/debug/8250.S | 52 | ||||
| -rw-r--r-- | arch/arm/lib/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/lib/debug.S | 136 |
6 files changed, 257 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 22eb2d5..79ccc06 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -950,4 +950,6 @@ source "board/woodburn/Kconfig" source "board/xaeniax/Kconfig" source "board/zipitz2/Kconfig" +source "arch/arm/Kconfig.debug" + endmenu diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug new file mode 100644 index 0000000..624bcf4 --- /dev/null +++ b/arch/arm/Kconfig.debug @@ -0,0 +1,64 @@ +menu "ARM debug" + +config DEBUG_LL + bool "Low-level debugging functions" + depends on !ARM64 + help + Say Y here to include definitions of printascii, printch, printhex + in U-Boot. This is helpful if you are debugging code that + executes before the console is initialized. + +choice + prompt "Low-level debugging port" + depends on DEBUG_LL + + config DEBUG_LL_UART_8250 + bool "Low-level debugging via 8250 UART" + help + Say Y here if you wish the debug print routes to direct + their output to an 8250 UART. You can use this option + to provide the parameters for the 8250 UART rather than + selecting one of the platform specific options above if + you know the parameters for the port. + + This option is preferred over the platform specific + options; the platform specific options are deprecated + and will be soon removed. + +endchoice + +config DEBUG_LL_INCLUDE + string + depends on DEBUG_LL + default "debug/8250.S" if DEBUG_LL_UART_8250 || DEBUG_UART_8250 + default "mach/debug-macro.S" + +# Compatibility options for 8250 +config DEBUG_UART_8250 + bool + +config DEBUG_UART_PHYS + hex "Physical base address of debug UART" + depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250 + +# This is not used in U-Boot +config DEBUG_UART_VIRT + hex + default DEBUG_UART_PHYS + depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250 + +config DEBUG_UART_8250_SHIFT + int "Register offset shift for the 8250 debug UART" + depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250 + default 2 + +config DEBUG_UART_8250_WORD + bool "Use 32-bit accesses for 8250 UART" + depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250 + depends on DEBUG_UART_8250_SHIFT >= 2 + +config DEBUG_UART_8250_FLOW_CONTROL + bool "Enable flow control for 8250 UART" + depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250 + +endmenu diff --git a/arch/arm/include/asm/macro.h b/arch/arm/include/asm/macro.h index 541b443..1c8c425 100644 --- a/arch/arm/include/asm/macro.h +++ b/arch/arm/include/asm/macro.h @@ -193,7 +193,7 @@ lr .req x30 0 : wfi ldr \wreg2, [\xreg1, GICC_AIAR] str \wreg2, [\xreg1, GICC_AEOIR] - and \wreg2, \wreg2, #3ff + and \wreg2, \wreg2, #0x3ff cbnz \wreg2, 0b .endm #endif diff --git a/arch/arm/include/debug/8250.S b/arch/arm/include/debug/8250.S new file mode 100644 index 0000000..d47a892 --- /dev/null +++ b/arch/arm/include/debug/8250.S @@ -0,0 +1,52 @@ +/* + * arch/arm/include/debug/8250.S + * + * Copyright (C) 1994-2013 Russell King + * + * SPDX-License-Identifier: GPL-2.0+ + */ +#include <linux/serial_reg.h> + + .macro addruart, rp, rv, tmp + ldr \rp, =CONFIG_DEBUG_UART_PHYS + ldr \rv, =CONFIG_DEBUG_UART_VIRT + .endm + +#ifdef CONFIG_DEBUG_UART_8250_WORD + .macro store, rd, rx:vararg + str \rd, \rx + .endm + + .macro load, rd, rx:vararg + ldr \rd, \rx + .endm +#else + .macro store, rd, rx:vararg + strb \rd, \rx + .endm + + .macro load, rd, rx:vararg + ldrb \rd, \rx + .endm +#endif + +#define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT + + .macro senduart,rd,rx + store \rd, [\rx, #UART_TX << UART_SHIFT] + .endm + + .macro busyuart,rd,rx +1002: load \rd, [\rx, #UART_LSR << UART_SHIFT] + and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE + teq \rd, #UART_LSR_TEMT | UART_LSR_THRE + bne 1002b + .endm + + .macro waituart,rd,rx +#ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL +1001: load \rd, [\rx, #UART_MSR << UART_SHIFT] + tst \rd, #UART_MSR_CTS + beq 1001b +#endif + .endm diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile index 1ef2400..d74e4b8 100644 --- a/arch/arm/lib/Makefile +++ b/arch/arm/lib/Makefile @@ -48,6 +48,8 @@ ifndef CONFIG_ARM64 obj-y += cache-cp15.o endif +obj-$(CONFIG_DEBUG_LL) += debug.o + # For EABI conformant tool chains, provide eabi_compat() ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS))) extra-y += eabi_compat.o diff --git a/arch/arm/lib/debug.S b/arch/arm/lib/debug.S new file mode 100644 index 0000000..760ba74 --- /dev/null +++ b/arch/arm/lib/debug.S @@ -0,0 +1,136 @@ +/* + * linux/arch/arm/kernel/debug.S + * + * Copyright (C) 1994-1999 Russell King + * + * SPDX-License-Identifier: GPL-2.0+ + * + * 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! + */ + +#if !defined(CONFIG_DEBUG_SEMIHOSTING) +#include CONFIG_DEBUG_LL_INCLUDE +#endif + +#ifdef CONFIG_MMU + .macro addruart_current, rx, tmp1, tmp2 + addruart \tmp1, \tmp2, \rx + mrc p15, 0, \rx, c1, c0 + tst \rx, #1 + moveq \rx, \tmp1 + movne \rx, \tmp2 + .endm + +#else /* !CONFIG_MMU */ + .macro addruart_current, rx, tmp1, tmp2 + addruart \rx, \tmp1, \tmp2 + .endm + +#endif /* CONFIG_MMU */ + +/* + * 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 + strb r1, [r3] +1: and r1, r0, #15 + mov r0, r0, lsr #4 + cmp r1, #10 + addlt r1, r1, #'0' + addge r1, r1, #'a' - 10 + strb r1, [r3, #-1]! + teq r3, r2 + bne 1b + mov r0, r2 + b printascii +ENDPROC(printhex2) + +hexbuf: .space 16 + + .ltorg + +#ifndef CONFIG_DEBUG_SEMIHOSTING + +ENTRY(printascii) + addruart_current r3, r1, r2 + b 2f +1: waituart r2, r3 + senduart r1, r3 + busyuart r2, r3 + teq r1, #'\n' + moveq r1, #'\r' + beq 1b +2: teq r0, #0 + ldrneb r1, [r0], #1 + teqne r1, #0 + bne 1b + mov pc, lr +ENDPROC(printascii) + +ENTRY(printch) + addruart_current r3, r1, r2 + mov r1, r0 + mov r0, #0 + b 1b +ENDPROC(printch) + +#ifdef CONFIG_MMU +ENTRY(debug_ll_addr) + addruart r2, r3, ip + str r2, [r0] + str r3, [r1] + mov pc, lr +ENDPROC(debug_ll_addr) +#endif + +#else + +ENTRY(printascii) + mov r1, r0 + mov r0, #0x04 @ SYS_WRITE0 + ARM( svc #0x123456 ) + THUMB( svc #0xab ) + mov pc, lr +ENDPROC(printascii) + +ENTRY(printch) + adr r1, hexbuf + strb r0, [r1] + mov r0, #0x03 @ SYS_WRITEC + ARM( svc #0x123456 ) + THUMB( svc #0xab ) + mov pc, lr +ENDPROC(printch) + +ENTRY(debug_ll_addr) + mov r2, #0 + str r2, [r0] + str r2, [r1] + mov pc, lr +ENDPROC(debug_ll_addr) + +#endif |