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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/arch/unicore32/kernel/debug-macro.S
4 *
5 * Code specific to PKUnity SoC and UniCore ISA
6 *
7 * Copyright (C) 2001-2010 GUAN Xue-tao
8 *
9 * Debugging macro include header
10 */
11#include <generated/asm-offsets.h>
12#include <mach/hardware.h>
13
14		.macro	put_word_ocd, rd, rx=r16
151001:		movc		\rx, p1.c0, #0
16		cand.a	\rx, #2
17		bne	1001b
18		movc		p1.c1, \rd, #1
19		.endm
20
21#ifdef CONFIG_DEBUG_OCD
22		/* debug using UniCore On-Chip-Debugger */
23		.macro	addruart, rx
24		.endm
25
26		.macro	senduart, rd, rx
27		put_word_ocd	\rd, \rx
28		.endm
29
30		.macro	busyuart, rd, rx
31		.endm
32
33		.macro	waituart, rd, rx
34		.endm
35#else
36#define UART_CLK_DEFAULT        3686400 * 20
37	/* Uartclk = MCLK/ 2, The MCLK on my board is 3686400 * 40  */
38#define BAUD_RATE_DEFAULT	115200
39	/* The baud rate of the serial port */
40
41#define UART_DIVISOR_DEFAULT	(UART_CLK_DEFAULT \
42				/ (16 * BAUD_RATE_DEFAULT) - 1)
43
44		.macro	addruart,rx
45		mrc	p0, #0, \rx, c1, c0
46		tst	\rx, #1			@ MMU enabled?
47		moveq	\rx, #0xee000000	@ physical base address
48		movne	\rx, #0x6e000000	@ virtual address
49
50		@ We probe for the active serial port here
51		@ However, now we assume UART0 is active:	epip4d
52		@ We assume r1 and r2 can be clobbered.
53
54		movl 	r2, #UART_DIVISOR_DEFAULT
55		mov 	r1, #0x80
56		str	r1, [\rx, #UART_LCR_OFFSET]
57		and	r1, r2, #0xff00
58		mov	r1, r1, lsr #8
59		str	r1, [\rx, #UART_DLH_OFFSET]
60		and	r1, r2, #0xff
61		str	r1, [\rx, #UART_DLL_OFFSET]
62		mov 	r1, #0x7
63		str	r1, [\rx, #UART_FCR_OFFSET]
64		mov 	r1, #0x3
65		str	r1, [\rx, #UART_LCR_OFFSET]
66		mov 	r1, #0x0
67		str	r1, [\rx, #UART_IER_OFFSET]
68		.endm
69
70		.macro	senduart,rd,rx
71		str	\rd, [\rx, #UART_THR_OFFSET]
72		.endm
73
74		.macro	waituart,rd,rx
751001:		ldr	\rd, [\rx, #UART_LSR_OFFSET]
76		tst	\rd, #UART_LSR_THRE
77		beq	1001b
78		.endm
79
80		.macro	busyuart,rd,rx
811001:		ldr	\rd, [\rx, #UART_LSR_OFFSET]
82		tst	\rd, #UART_LSR_TEMT
83		bne	1001b
84		.endm
85#endif
86
87