tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Renesas SCIF(A) debugging macro include header
4 *
5 * Based on r8a7790.S
6 *
7 * Copyright (C) 2012-2013 Renesas Electronics Corporation
8 * Copyright (C) 1994-1999 Russell King
9 */
10
11#define SCIF_PHYS CONFIG_DEBUG_UART_PHYS
12#define SCIF_VIRT ((SCIF_PHYS & 0x00ffffff) | 0xfd000000)
13
14#if CONFIG_DEBUG_UART_PHYS < 0xe6e00000
15/* SCIFA */
16#define FTDR 0x20
17#define FSR 0x14
18#else
19/* SCIF */
20#define FTDR 0x0c
21#define FSR 0x10
22#endif
23
24#define TDFE (1 << 5)
25#define TEND (1 << 6)
26
27 .macro addruart, rp, rv, tmp
28 ldr \rp, =SCIF_PHYS
29 ldr \rv, =SCIF_VIRT
30 .endm
31
32 .macro waituart, rd, rx
331001: ldrh \rd, [\rx, #FSR]
34 tst \rd, #TDFE
35 beq 1001b
36 .endm
37
38 .macro senduart, rd, rx
39 strb \rd, [\rx, #FTDR]
40 ldrh \rd, [\rx, #FSR]
41 bic \rd, \rd, #TEND
42 strh \rd, [\rx, #FSR]
43 .endm
44
45 .macro busyuart, rd, rx
461001: ldrh \rd, [\rx, #FSR]
47 tst \rd, #TEND
48 beq 1001b
49 .endm