linux/arch/mips/kernel/cps-vec-ns16550.S
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

199 lines
4.6 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2015 Imagination Technologies
* Author: Paul Burton <paul.burton@mips.com>
*/
#include <asm/addrspace.h>
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <linux/serial_reg.h>
#define UART_TX_OFS (UART_TX << CONFIG_MIPS_CPS_NS16550_SHIFT)
#define UART_LSR_OFS (UART_LSR << CONFIG_MIPS_CPS_NS16550_SHIFT)
/**
* _mips_cps_putc() - write a character to the UART
* @a0: ASCII character to write
* @t9: UART base address
*/
LEAF(_mips_cps_putc)
1: lw t0, UART_LSR_OFS(t9)
andi t0, t0, UART_LSR_TEMT
beqz t0, 1b
sb a0, UART_TX_OFS(t9)
jr ra
END(_mips_cps_putc)
/**
* _mips_cps_puts() - write a string to the UART
* @a0: pointer to NULL-terminated ASCII string
* @t9: UART base address
*
* Write a null-terminated ASCII string to the UART.
*/
NESTED(_mips_cps_puts, 0, ra)
move s7, ra
move s6, a0
1: lb a0, 0(s6)
beqz a0, 2f
jal _mips_cps_putc
PTR_ADDIU s6, s6, 1
b 1b
2: jr s7
END(_mips_cps_puts)
/**
* _mips_cps_putx4 - write a 4b hex value to the UART
* @a0: the 4b value to write to the UART
* @t9: UART base address
*
* Write a single hexadecimal character to the UART.
*/
NESTED(_mips_cps_putx4, 0, ra)
andi a0, a0, 0xf
li t0, '0'
blt a0, 10, 1f
li t0, 'a'
addiu a0, a0, -10
1: addu a0, a0, t0
b _mips_cps_putc
END(_mips_cps_putx4)
/**
* _mips_cps_putx8 - write an 8b hex value to the UART
* @a0: the 8b value to write to the UART
* @t9: UART base address
*
* Write an 8 bit value (ie. 2 hexadecimal characters) to the UART.
*/
NESTED(_mips_cps_putx8, 0, ra)
move s3, ra
move s2, a0
srl a0, a0, 4
jal _mips_cps_putx4
move a0, s2
move ra, s3
b _mips_cps_putx4
END(_mips_cps_putx8)
/**
* _mips_cps_putx16 - write a 16b hex value to the UART
* @a0: the 16b value to write to the UART
* @t9: UART base address
*
* Write a 16 bit value (ie. 4 hexadecimal characters) to the UART.
*/
NESTED(_mips_cps_putx16, 0, ra)
move s5, ra
move s4, a0
srl a0, a0, 8
jal _mips_cps_putx8
move a0, s4
move ra, s5
b _mips_cps_putx8
END(_mips_cps_putx16)
/**
* _mips_cps_putx32 - write a 32b hex value to the UART
* @a0: the 32b value to write to the UART
* @t9: UART base address
*
* Write a 32 bit value (ie. 8 hexadecimal characters) to the UART.
*/
NESTED(_mips_cps_putx32, 0, ra)
move s7, ra
move s6, a0
srl a0, a0, 16
jal _mips_cps_putx16
move a0, s6
move ra, s7
b _mips_cps_putx16
END(_mips_cps_putx32)
#ifdef CONFIG_64BIT
/**
* _mips_cps_putx64 - write a 64b hex value to the UART
* @a0: the 64b value to write to the UART
* @t9: UART base address
*
* Write a 64 bit value (ie. 16 hexadecimal characters) to the UART.
*/
NESTED(_mips_cps_putx64, 0, ra)
move sp, ra
move s8, a0
dsrl32 a0, a0, 0
jal _mips_cps_putx32
move a0, s8
move ra, sp
b _mips_cps_putx32
END(_mips_cps_putx64)
#define _mips_cps_putxlong _mips_cps_putx64
#else /* !CONFIG_64BIT */
#define _mips_cps_putxlong _mips_cps_putx32
#endif /* !CONFIG_64BIT */
/**
* mips_cps_bev_dump() - dump relevant exception state to UART
* @a0: pointer to NULL-terminated ASCII string naming the exception
*
* Write information that may be useful in debugging an exception to the
* UART configured by CONFIG_MIPS_CPS_NS16550_*. As this BEV exception
* will only be run if something goes horribly wrong very early during
* the bringup of a core and it is very likely to be unsafe to perform
* memory accesses at that point (cache state indeterminate, EVA may not
* be configured, coherence may be disabled) let alone have a stack,
* this is all written in assembly using only registers & unmapped
* uncached access to the UART registers.
*/
LEAF(mips_cps_bev_dump)
move s0, ra
move s1, a0
li t9, CKSEG1ADDR(CONFIG_MIPS_CPS_NS16550_BASE)
PTR_LA a0, str_newline
jal _mips_cps_puts
PTR_LA a0, str_bev
jal _mips_cps_puts
move a0, s1
jal _mips_cps_puts
PTR_LA a0, str_newline
jal _mips_cps_puts
PTR_LA a0, str_newline
jal _mips_cps_puts
#define DUMP_COP0_REG(reg, name, sz, _mfc0) \
PTR_LA a0, 8f; \
jal _mips_cps_puts; \
_mfc0 a0, reg; \
jal _mips_cps_putx##sz; \
PTR_LA a0, str_newline; \
jal _mips_cps_puts; \
TEXT(name)
DUMP_COP0_REG(CP0_CAUSE, "Cause: 0x", 32, mfc0)
DUMP_COP0_REG(CP0_STATUS, "Status: 0x", 32, mfc0)
DUMP_COP0_REG(CP0_EBASE, "EBase: 0x", long, MFC0)
DUMP_COP0_REG(CP0_BADVADDR, "BadVAddr: 0x", long, MFC0)
DUMP_COP0_REG(CP0_BADINSTR, "BadInstr: 0x", 32, mfc0)
PTR_LA a0, str_newline
jal _mips_cps_puts
jr s0
END(mips_cps_bev_dump)
.pushsection .data
str_bev: .asciiz "BEV Exception: "
str_newline: .asciiz "\r\n"
.popsection