blob: c07f4c9b4737f5a64ea59e1a570e77c9850e0f7f [file] [log] [blame]
b.liue9582032025-04-17 19:18:16 +08001/*
2 * (C) Copyright 2002
3 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <linux/compiler.h>
10#include <asm/arch/s3c24x0_cpu.h>
11
12DECLARE_GLOBAL_DATA_PTR;
13
14#ifdef CONFIG_SERIAL1
15#define UART_NR S3C24X0_UART0
16
17#elif defined(CONFIG_SERIAL2)
18#define UART_NR S3C24X0_UART1
19
20#elif defined(CONFIG_SERIAL3)
21#define UART_NR S3C24X0_UART2
22
23#else
24#error "Bad: you didn't configure serial ..."
25#endif
26
27#include <asm/io.h>
28#include <serial.h>
29
30/* Multi serial device functions */
31#define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
32 int s3serial##port##_init(void) \
33 { \
34 return serial_init_dev(port); \
35 } \
36 void s3serial##port##_setbrg(void) \
37 { \
38 serial_setbrg_dev(port); \
39 } \
40 int s3serial##port##_getc(void) \
41 { \
42 return serial_getc_dev(port); \
43 } \
44 int s3serial##port##_tstc(void) \
45 { \
46 return serial_tstc_dev(port); \
47 } \
48 void s3serial##port##_putc(const char c) \
49 { \
50 serial_putc_dev(port, c); \
51 } \
52 void s3serial##port##_puts(const char *s) \
53 { \
54 serial_puts_dev(port, s); \
55 }
56
57#define INIT_S3C_SERIAL_STRUCTURE(port, __name) { \
58 .name = __name, \
59 .start = s3serial##port##_init, \
60 .stop = NULL, \
61 .setbrg = s3serial##port##_setbrg, \
62 .getc = s3serial##port##_getc, \
63 .tstc = s3serial##port##_tstc, \
64 .putc = s3serial##port##_putc, \
65 .puts = s3serial##port##_puts, \
66}
67
68#ifdef CONFIG_HWFLOW
69static int hwflow;
70#endif
71
72void _serial_setbrg(const int dev_index)
73{
74 struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
75 unsigned int reg = 0;
76 int i;
77
78 /* value is calculated so : (int)(PCLK/16./baudrate) -1 */
79 reg = get_PCLK() / (16 * gd->baudrate) - 1;
80
81 writel(reg, &uart->ubrdiv);
82 for (i = 0; i < 100; i++)
83 /* Delay */ ;
84}
85
86static inline void serial_setbrg_dev(unsigned int dev_index)
87{
88 _serial_setbrg(dev_index);
89}
90
91/* Initialise the serial port. The settings are always 8 data bits, no parity,
92 * 1 stop bit, no start bits.
93 */
94static int serial_init_dev(const int dev_index)
95{
96 struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
97
98#ifdef CONFIG_HWFLOW
99 hwflow = 0; /* turned off by default */
100#endif
101
102 /* FIFO enable, Tx/Rx FIFO clear */
103 writel(0x07, &uart->ufcon);
104 writel(0x0, &uart->umcon);
105
106 /* Normal,No parity,1 stop,8 bit */
107 writel(0x3, &uart->ulcon);
108 /*
109 * tx=level,rx=edge,disable timeout int.,enable rx error int.,
110 * normal,interrupt or polling
111 */
112 writel(0x245, &uart->ucon);
113
114#ifdef CONFIG_HWFLOW
115 writel(0x1, &uart->umcon); /* rts up */
116#endif
117
118 /* FIXME: This is sooooooooooooooooooo ugly */
119#if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
120 /* we need auto hw flow control on the gsm and gps port */
121 if (dev_index == 0 || dev_index == 1)
122 writel(0x10, &uart->umcon);
123#endif
124 _serial_setbrg(dev_index);
125
126 return (0);
127}
128
129/*
130 * Read a single byte from the serial port. Returns 1 on success, 0
131 * otherwise. When the function is succesfull, the character read is
132 * written into its argument c.
133 */
134int _serial_getc(const int dev_index)
135{
136 struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
137
138 while (!(readl(&uart->utrstat) & 0x1))
139 /* wait for character to arrive */ ;
140
141 return readb(&uart->urxh) & 0xff;
142}
143
144static inline int serial_getc_dev(unsigned int dev_index)
145{
146 return _serial_getc(dev_index);
147}
148
149#ifdef CONFIG_HWFLOW
150int hwflow_onoff(int on)
151{
152 switch (on) {
153 case 0:
154 default:
155 break; /* return current */
156 case 1:
157 hwflow = 1; /* turn on */
158 break;
159 case -1:
160 hwflow = 0; /* turn off */
161 break;
162 }
163 return hwflow;
164}
165#endif
166
167#ifdef CONFIG_MODEM_SUPPORT
168static int be_quiet = 0;
169void disable_putc(void)
170{
171 be_quiet = 1;
172}
173
174void enable_putc(void)
175{
176 be_quiet = 0;
177}
178#endif
179
180
181/*
182 * Output a single byte to the serial port.
183 */
184void _serial_putc(const char c, const int dev_index)
185{
186 struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
187#ifdef CONFIG_MODEM_SUPPORT
188 if (be_quiet)
189 return;
190#endif
191
192 while (!(readl(&uart->utrstat) & 0x2))
193 /* wait for room in the tx FIFO */ ;
194
195#ifdef CONFIG_HWFLOW
196 while (hwflow && !(readl(&uart->umstat) & 0x1))
197 /* Wait for CTS up */ ;
198#endif
199
200 writeb(c, &uart->utxh);
201
202 /* If \n, also do \r */
203 if (c == '\n')
204 serial_putc('\r');
205}
206
207static inline void serial_putc_dev(unsigned int dev_index, const char c)
208{
209 _serial_putc(c, dev_index);
210}
211
212/*
213 * Test whether a character is in the RX buffer
214 */
215int _serial_tstc(const int dev_index)
216{
217 struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
218
219 return readl(&uart->utrstat) & 0x1;
220}
221
222static inline int serial_tstc_dev(unsigned int dev_index)
223{
224 return _serial_tstc(dev_index);
225}
226
227void _serial_puts(const char *s, const int dev_index)
228{
229 while (*s) {
230 _serial_putc(*s++, dev_index);
231 }
232}
233
234static inline void serial_puts_dev(int dev_index, const char *s)
235{
236 _serial_puts(s, dev_index);
237}
238
239DECLARE_S3C_SERIAL_FUNCTIONS(0);
240struct serial_device s3c24xx_serial0_device =
241INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0");
242DECLARE_S3C_SERIAL_FUNCTIONS(1);
243struct serial_device s3c24xx_serial1_device =
244INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1");
245DECLARE_S3C_SERIAL_FUNCTIONS(2);
246struct serial_device s3c24xx_serial2_device =
247INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2");
248
249__weak struct serial_device *default_serial_console(void)
250{
251#if defined(CONFIG_SERIAL1)
252 return &s3c24xx_serial0_device;
253#elif defined(CONFIG_SERIAL2)
254 return &s3c24xx_serial1_device;
255#elif defined(CONFIG_SERIAL3)
256 return &s3c24xx_serial2_device;
257#else
258#error "CONFIG_SERIAL? missing."
259#endif
260}
261
262void s3c24xx_serial_initialize(void)
263{
264 serial_register(&s3c24xx_serial0_device);
265 serial_register(&s3c24xx_serial1_device);
266 serial_register(&s3c24xx_serial2_device);
267}