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12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/console.h>
16#include <linux/init.h>
17#include <linux/mm.h>
18#include <linux/major.h>
19#include <linux/param.h>
20#include <linux/seq_file.h>
21#include <linux/serial.h>
22
23#include <linux/uaccess.h>
24#include <asm/irq.h>
25
26#include <platform/simcall.h>
27
28#include <linux/tty.h>
29#include <linux/tty_flip.h>
30
31#define SERIAL_MAX_NUM_LINES 1
32#define SERIAL_TIMER_VALUE (HZ / 10)
33
34static void rs_poll(struct timer_list *);
35
36static struct tty_driver *serial_driver;
37static struct tty_port serial_port;
38static DEFINE_TIMER(serial_timer, rs_poll);
39static DEFINE_SPINLOCK(timer_lock);
40
41static int rs_open(struct tty_struct *tty, struct file * filp)
42{
43 spin_lock_bh(&timer_lock);
44 if (tty->count == 1)
45 mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
46 spin_unlock_bh(&timer_lock);
47
48 return 0;
49}
50
51static void rs_close(struct tty_struct *tty, struct file * filp)
52{
53 spin_lock_bh(&timer_lock);
54 if (tty->count == 1)
55 del_timer_sync(&serial_timer);
56 spin_unlock_bh(&timer_lock);
57}
58
59
60static int rs_write(struct tty_struct * tty,
61 const unsigned char *buf, int count)
62{
63
64
65 simc_write(1, buf, count);
66 return count;
67}
68
69static void rs_poll(struct timer_list *unused)
70{
71 struct tty_port *port = &serial_port;
72 int i = 0;
73 int rd = 1;
74 unsigned char c;
75
76 spin_lock(&timer_lock);
77
78 while (simc_poll(0)) {
79 rd = simc_read(0, &c, 1);
80 if (rd <= 0)
81 break;
82 tty_insert_flip_char(port, c, TTY_NORMAL);
83 i++;
84 }
85
86 if (i)
87 tty_flip_buffer_push(port);
88 if (rd)
89 mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
90 spin_unlock(&timer_lock);
91}
92
93
94static int rs_put_char(struct tty_struct *tty, unsigned char ch)
95{
96 return rs_write(tty, &ch, 1);
97}
98
99static void rs_flush_chars(struct tty_struct *tty)
100{
101}
102
103static int rs_write_room(struct tty_struct *tty)
104{
105
106 return 2 * 1024;
107}
108
109static int rs_chars_in_buffer(struct tty_struct *tty)
110{
111
112 return 0;
113}
114
115static void rs_hangup(struct tty_struct *tty)
116{
117
118}
119
120static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
121{
122
123}
124
125static int rs_proc_show(struct seq_file *m, void *v)
126{
127 seq_printf(m, "serinfo:1.0 driver:0.1\n");
128 return 0;
129}
130
131static const struct tty_operations serial_ops = {
132 .open = rs_open,
133 .close = rs_close,
134 .write = rs_write,
135 .put_char = rs_put_char,
136 .flush_chars = rs_flush_chars,
137 .write_room = rs_write_room,
138 .chars_in_buffer = rs_chars_in_buffer,
139 .hangup = rs_hangup,
140 .wait_until_sent = rs_wait_until_sent,
141 .proc_show = rs_proc_show,
142};
143
144static int __init rs_init(void)
145{
146 tty_port_init(&serial_port);
147
148 serial_driver = alloc_tty_driver(SERIAL_MAX_NUM_LINES);
149
150
151
152 serial_driver->driver_name = "iss_serial";
153 serial_driver->name = "ttyS";
154 serial_driver->major = TTY_MAJOR;
155 serial_driver->minor_start = 64;
156 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
157 serial_driver->subtype = SERIAL_TYPE_NORMAL;
158 serial_driver->init_termios = tty_std_termios;
159 serial_driver->init_termios.c_cflag =
160 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
161 serial_driver->flags = TTY_DRIVER_REAL_RAW;
162
163 tty_set_operations(serial_driver, &serial_ops);
164 tty_port_link_device(&serial_port, serial_driver, 0);
165
166 if (tty_register_driver(serial_driver))
167 panic("Couldn't register serial driver\n");
168 return 0;
169}
170
171
172static __exit void rs_exit(void)
173{
174 tty_unregister_driver(serial_driver);
175 put_tty_driver(serial_driver);
176 tty_port_destroy(&serial_port);
177}
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188
189late_initcall(rs_init);
190
191
192#ifdef CONFIG_SERIAL_CONSOLE
193
194static void iss_console_write(struct console *co, const char *s, unsigned count)
195{
196 int len = strlen(s);
197
198 if (s != 0 && *s != 0)
199 simc_write(1, s, count < len ? count : len);
200}
201
202static struct tty_driver* iss_console_device(struct console *c, int *index)
203{
204 *index = c->index;
205 return serial_driver;
206}
207
208
209static struct console sercons = {
210 .name = "ttyS",
211 .write = iss_console_write,
212 .device = iss_console_device,
213 .flags = CON_PRINTBUFFER,
214 .index = -1
215};
216
217static int __init iss_console_init(void)
218{
219 register_console(&sercons);
220 return 0;
221}
222
223console_initcall(iss_console_init);
224
225#endif
226
227