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Linux/arch/xtensa/platforms/iss/console.c

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  1 /*
  2  * arch/xtensa/platforms/iss/console.c
  3  *
  4  * This file is subject to the terms and conditions of the GNU General Public
  5  * License.  See the file "COPYING" in the main directory of this archive
  6  * for more details.
  7  *
  8  * Copyright (C) 2001-2005 Tensilica Inc.
  9  *   Authors    Christian Zankel, Joe Taylor
 10  */
 11 
 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 <asm/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 #ifdef SERIAL_INLINE
 32 #define _INLINE_ inline
 33 #endif
 34 
 35 #define SERIAL_MAX_NUM_LINES 1
 36 #define SERIAL_TIMER_VALUE (HZ / 10)
 37 
 38 static struct tty_driver *serial_driver;
 39 static struct tty_port serial_port;
 40 static struct timer_list serial_timer;
 41 
 42 static DEFINE_SPINLOCK(timer_lock);
 43 
 44 static char *serial_version = "0.1";
 45 static char *serial_name = "ISS serial driver";
 46 
 47 /*
 48  * This routine is called whenever a serial port is opened.  It
 49  * enables interrupts for a serial port, linking in its async structure into
 50  * the IRQ chain.   It also performs the serial-specific
 51  * initialization for the tty structure.
 52  */
 53 
 54 static void rs_poll(unsigned long);
 55 
 56 static int rs_open(struct tty_struct *tty, struct file * filp)
 57 {
 58         tty->port = &serial_port;
 59         spin_lock_bh(&timer_lock);
 60         if (tty->count == 1) {
 61                 setup_timer(&serial_timer, rs_poll,
 62                                 (unsigned long)&serial_port);
 63                 mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
 64         }
 65         spin_unlock_bh(&timer_lock);
 66 
 67         return 0;
 68 }
 69 
 70 
 71 /*
 72  * ------------------------------------------------------------
 73  * iss_serial_close()
 74  *
 75  * This routine is called when the serial port gets closed.  First, we
 76  * wait for the last remaining data to be sent.  Then, we unlink its
 77  * async structure from the interrupt chain if necessary, and we free
 78  * that IRQ if nothing is left in the chain.
 79  * ------------------------------------------------------------
 80  */
 81 static void rs_close(struct tty_struct *tty, struct file * filp)
 82 {
 83         spin_lock_bh(&timer_lock);
 84         if (tty->count == 1)
 85                 del_timer_sync(&serial_timer);
 86         spin_unlock_bh(&timer_lock);
 87 }
 88 
 89 
 90 static int rs_write(struct tty_struct * tty,
 91                     const unsigned char *buf, int count)
 92 {
 93         /* see drivers/char/serialX.c to reference original version */
 94 
 95         simc_write(1, buf, count);
 96         return count;
 97 }
 98 
 99 static void rs_poll(unsigned long priv)
100 {
101         struct tty_port *port = (struct tty_port *)priv;
102         int i = 0;
103         int rd = 1;
104         unsigned char c;
105 
106         spin_lock(&timer_lock);
107 
108         while (simc_poll(0)) {
109                 rd = simc_read(0, &c, 1);
110                 if (rd <= 0)
111                         break;
112                 tty_insert_flip_char(port, c, TTY_NORMAL);
113                 i++;
114         }
115 
116         if (i)
117                 tty_flip_buffer_push(port);
118         if (rd)
119                 mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
120         spin_unlock(&timer_lock);
121 }
122 
123 
124 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
125 {
126         return rs_write(tty, &ch, 1);
127 }
128 
129 static void rs_flush_chars(struct tty_struct *tty)
130 {
131 }
132 
133 static int rs_write_room(struct tty_struct *tty)
134 {
135         /* Let's say iss can always accept 2K characters.. */
136         return 2 * 1024;
137 }
138 
139 static int rs_chars_in_buffer(struct tty_struct *tty)
140 {
141         /* the iss doesn't buffer characters */
142         return 0;
143 }
144 
145 static void rs_hangup(struct tty_struct *tty)
146 {
147         /* Stub, once again.. */
148 }
149 
150 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
151 {
152         /* Stub, once again.. */
153 }
154 
155 static int rs_proc_show(struct seq_file *m, void *v)
156 {
157         seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
158         return 0;
159 }
160 
161 static int rs_proc_open(struct inode *inode, struct file *file)
162 {
163         return single_open(file, rs_proc_show, NULL);
164 }
165 
166 static const struct file_operations rs_proc_fops = {
167         .owner          = THIS_MODULE,
168         .open           = rs_proc_open,
169         .read           = seq_read,
170         .llseek         = seq_lseek,
171         .release        = single_release,
172 };
173 
174 static const struct tty_operations serial_ops = {
175         .open = rs_open,
176         .close = rs_close,
177         .write = rs_write,
178         .put_char = rs_put_char,
179         .flush_chars = rs_flush_chars,
180         .write_room = rs_write_room,
181         .chars_in_buffer = rs_chars_in_buffer,
182         .hangup = rs_hangup,
183         .wait_until_sent = rs_wait_until_sent,
184         .proc_fops = &rs_proc_fops,
185 };
186 
187 int __init rs_init(void)
188 {
189         tty_port_init(&serial_port);
190 
191         serial_driver = alloc_tty_driver(SERIAL_MAX_NUM_LINES);
192 
193         printk ("%s %s\n", serial_name, serial_version);
194 
195         /* Initialize the tty_driver structure */
196 
197         serial_driver->driver_name = "iss_serial";
198         serial_driver->name = "ttyS";
199         serial_driver->major = TTY_MAJOR;
200         serial_driver->minor_start = 64;
201         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
202         serial_driver->subtype = SERIAL_TYPE_NORMAL;
203         serial_driver->init_termios = tty_std_termios;
204         serial_driver->init_termios.c_cflag =
205                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
206         serial_driver->flags = TTY_DRIVER_REAL_RAW;
207 
208         tty_set_operations(serial_driver, &serial_ops);
209         tty_port_link_device(&serial_port, serial_driver, 0);
210 
211         if (tty_register_driver(serial_driver))
212                 panic("Couldn't register serial driver\n");
213         return 0;
214 }
215 
216 
217 static __exit void rs_exit(void)
218 {
219         int error;
220 
221         if ((error = tty_unregister_driver(serial_driver)))
222                 printk("ISS_SERIAL: failed to unregister serial driver (%d)\n",
223                        error);
224         put_tty_driver(serial_driver);
225         tty_port_destroy(&serial_port);
226 }
227 
228 
229 /* We use `late_initcall' instead of just `__initcall' as a workaround for
230  * the fact that (1) simcons_tty_init can't be called before tty_init,
231  * (2) tty_init is called via `module_init', (3) if statically linked,
232  * module_init == device_init, and (4) there's no ordering of init lists.
233  * We can do this easily because simcons is always statically linked, but
234  * other tty drivers that depend on tty_init and which must use
235  * `module_init' to declare their init routines are likely to be broken.
236  */
237 
238 late_initcall(rs_init);
239 
240 
241 #ifdef CONFIG_SERIAL_CONSOLE
242 
243 static void iss_console_write(struct console *co, const char *s, unsigned count)
244 {
245         int len = strlen(s);
246 
247         if (s != 0 && *s != 0)
248                 simc_write(1, s, count < len ? count : len);
249 }
250 
251 static struct tty_driver* iss_console_device(struct console *c, int *index)
252 {
253         *index = c->index;
254         return serial_driver;
255 }
256 
257 
258 static struct console sercons = {
259         .name = "ttyS",
260         .write = iss_console_write,
261         .device = iss_console_device,
262         .flags = CON_PRINTBUFFER,
263         .index = -1
264 };
265 
266 static int __init iss_console_init(void)
267 {
268         register_console(&sercons);
269         return 0;
270 }
271 
272 console_initcall(iss_console_init);
273 
274 #endif /* CONFIG_SERIAL_CONSOLE */
275 
276 

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