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-rw-r--r--arch/xtensa/platforms/iss/console.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/arch/xtensa/platforms/iss/console.c b/arch/xtensa/platforms/iss/console.c
new file mode 100644
index 000000000..10b79d3c7
--- /dev/null
+++ b/arch/xtensa/platforms/iss/console.c
@@ -0,0 +1,224 @@
+/*
+ * arch/xtensa/platforms/iss/console.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001-2005 Tensilica Inc.
+ * Authors Christian Zankel, Joe Taylor
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/major.h>
+#include <linux/param.h>
+#include <linux/seq_file.h>
+#include <linux/serial.h>
+
+#include <linux/uaccess.h>
+#include <asm/irq.h>
+
+#include <platform/simcall.h>
+
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+
+#define SERIAL_MAX_NUM_LINES 1
+#define SERIAL_TIMER_VALUE (HZ / 10)
+
+static void rs_poll(struct timer_list *);
+
+static struct tty_driver *serial_driver;
+static struct tty_port serial_port;
+static DEFINE_TIMER(serial_timer, rs_poll);
+
+static int rs_open(struct tty_struct *tty, struct file * filp)
+{
+ if (tty->count == 1)
+ mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
+
+ return 0;
+}
+
+static void rs_close(struct tty_struct *tty, struct file * filp)
+{
+ if (tty->count == 1)
+ del_timer_sync(&serial_timer);
+}
+
+
+static int rs_write(struct tty_struct * tty,
+ const unsigned char *buf, int count)
+{
+ /* see drivers/char/serialX.c to reference original version */
+
+ simc_write(1, buf, count);
+ return count;
+}
+
+static void rs_poll(struct timer_list *unused)
+{
+ struct tty_port *port = &serial_port;
+ int i = 0;
+ int rd = 1;
+ unsigned char c;
+
+ while (simc_poll(0)) {
+ rd = simc_read(0, &c, 1);
+ if (rd <= 0)
+ break;
+ tty_insert_flip_char(port, c, TTY_NORMAL);
+ i++;
+ }
+
+ if (i)
+ tty_flip_buffer_push(port);
+ if (rd)
+ mod_timer(&serial_timer, jiffies + SERIAL_TIMER_VALUE);
+}
+
+
+static int rs_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ return rs_write(tty, &ch, 1);
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+}
+
+static unsigned int rs_write_room(struct tty_struct *tty)
+{
+ /* Let's say iss can always accept 2K characters.. */
+ return 2 * 1024;
+}
+
+static void rs_hangup(struct tty_struct *tty)
+{
+ /* Stub, once again.. */
+}
+
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+ /* Stub, once again.. */
+}
+
+static int rs_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "serinfo:1.0 driver:0.1\n");
+ return 0;
+}
+
+static const struct tty_operations serial_ops = {
+ .open = rs_open,
+ .close = rs_close,
+ .write = rs_write,
+ .put_char = rs_put_char,
+ .flush_chars = rs_flush_chars,
+ .write_room = rs_write_room,
+ .hangup = rs_hangup,
+ .wait_until_sent = rs_wait_until_sent,
+ .proc_show = rs_proc_show,
+};
+
+static int __init rs_init(void)
+{
+ struct tty_driver *driver;
+ int ret;
+
+ driver = tty_alloc_driver(SERIAL_MAX_NUM_LINES, TTY_DRIVER_REAL_RAW);
+ if (IS_ERR(driver))
+ return PTR_ERR(driver);
+
+ tty_port_init(&serial_port);
+
+ /* Initialize the tty_driver structure */
+
+ driver->driver_name = "iss_serial";
+ driver->name = "ttyS";
+ driver->major = TTY_MAJOR;
+ driver->minor_start = 64;
+ driver->type = TTY_DRIVER_TYPE_SERIAL;
+ driver->subtype = SERIAL_TYPE_NORMAL;
+ driver->init_termios = tty_std_termios;
+ driver->init_termios.c_cflag =
+ B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+
+ tty_set_operations(driver, &serial_ops);
+ tty_port_link_device(&serial_port, driver, 0);
+
+ ret = tty_register_driver(driver);
+ if (ret) {
+ pr_err("Couldn't register serial driver\n");
+ tty_driver_kref_put(driver);
+ tty_port_destroy(&serial_port);
+
+ return ret;
+ }
+
+ serial_driver = driver;
+
+ return 0;
+}
+
+
+static __exit void rs_exit(void)
+{
+ tty_unregister_driver(serial_driver);
+ tty_driver_kref_put(serial_driver);
+ tty_port_destroy(&serial_port);
+}
+
+
+/* We use `late_initcall' instead of just `__initcall' as a workaround for
+ * the fact that (1) simcons_tty_init can't be called before tty_init,
+ * (2) tty_init is called via `module_init', (3) if statically linked,
+ * module_init == device_init, and (4) there's no ordering of init lists.
+ * We can do this easily because simcons is always statically linked, but
+ * other tty drivers that depend on tty_init and which must use
+ * `module_init' to declare their init routines are likely to be broken.
+ */
+
+late_initcall(rs_init);
+
+
+#ifdef CONFIG_SERIAL_CONSOLE
+
+static void iss_console_write(struct console *co, const char *s, unsigned count)
+{
+ if (s && *s != 0) {
+ int len = strlen(s);
+ simc_write(1, s, count < len ? count : len);
+ }
+}
+
+static struct tty_driver* iss_console_device(struct console *c, int *index)
+{
+ *index = c->index;
+ return serial_driver;
+}
+
+
+static struct console sercons = {
+ .name = "ttyS",
+ .write = iss_console_write,
+ .device = iss_console_device,
+ .flags = CON_PRINTBUFFER,
+ .index = -1
+};
+
+static int __init iss_console_init(void)
+{
+ register_console(&sercons);
+ return 0;
+}
+
+console_initcall(iss_console_init);
+
+#endif /* CONFIG_SERIAL_CONSOLE */
+