blob: ecd30ddfb3dbdffde9b4108e5aba60ead9693997 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/*
* 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.
*
* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
*/
#include <linux/io.h>
#include <linux/serial_reg.h>
#include <asm/addrspace.h>
#include <asm/setup.h>
#ifdef CONFIG_SOC_RT288X
#define EARLY_UART_BASE 0x300c00
#define CHIPID_BASE 0x300004
#elif defined(CONFIG_SOC_MT7621)
#define EARLY_UART_BASE 0x1E000c00
#define CHIPID_BASE 0x1E000004
#else
#define EARLY_UART_BASE 0x10000c00
#define CHIPID_BASE 0x10000004
#endif
#define MT7628_CHIP_NAME1 0x20203832
#define UART_REG_TX 0x04
#define UART_REG_LCR 0x0c
#define UART_REG_LSR 0x14
#define UART_REG_LSR_RT2880 0x1c
static __iomem void *uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE);
static __iomem void *chipid_membase = (__iomem void *) KSEG1ADDR(CHIPID_BASE);
static int init_complete;
static inline void uart_w32(u32 val, unsigned reg)
{
__raw_writel(val, uart_membase + reg);
}
static inline u32 uart_r32(unsigned reg)
{
return __raw_readl(uart_membase + reg);
}
static inline int soc_is_mt7628(void)
{
return IS_ENABLED(CONFIG_SOC_MT7620) &&
(__raw_readl(chipid_membase) == MT7628_CHIP_NAME1);
}
static void find_uart_base(void)
{
int i;
if (!soc_is_mt7628())
return;
for (i = 0; i < 3; i++) {
u32 reg = uart_r32(UART_REG_LCR + (0x100 * i));
if (!reg)
continue;
uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE +
(0x100 * i));
break;
}
}
void prom_putchar(char ch)
{
if (!init_complete) {
find_uart_base();
init_complete = 1;
}
if (IS_ENABLED(CONFIG_SOC_MT7621) || soc_is_mt7628()) {
uart_w32((unsigned char)ch, UART_TX);
while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
;
} else {
while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)
;
uart_w32((unsigned char)ch, UART_REG_TX);
while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)
;
}
}
|
