[linux-2.6-block.git] / drivers / tty / bfin_jtag_comm.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * TTY over Blackfin JTAG Communication
 *
 * Copyright 2008-2009 Analog Devices Inc.
 *
 * Enter bugs at http://blackfin.uclinux.org/
 */

#define DRV_NAME "bfin-jtag-comm"
#define DEV_NAME "ttyBFJC"
#define pr_fmt(fmt) DRV_NAME ": " fmt

#include <linux/circ_buf.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/atomic.h>

#define pr_init(fmt, args...) ({ static const __initconst char __fmt[] = fmt; printk(__fmt, ## args); })

/* See the Debug/Emulation chapter in the HRM */
#define EMUDOF   0x00000001	/* EMUDAT_OUT full & valid */
#define EMUDIF   0x00000002	/* EMUDAT_IN full & valid */
#define EMUDOOVF 0x00000004	/* EMUDAT_OUT overflow */
#define EMUDIOVF 0x00000008	/* EMUDAT_IN overflow */

static inline uint32_t bfin_write_emudat(uint32_t emudat)
{
	__asm__ __volatile__("emudat = %0;" : : "d"(emudat));
	return emudat;
}

static inline uint32_t bfin_read_emudat(void)
{
	uint32_t emudat;
	__asm__ __volatile__("%0 = emudat;" : "=d"(emudat));
	return emudat;
}

static inline uint32_t bfin_write_emudat_chars(char a, char b, char c, char d)
{
	return bfin_write_emudat((a << 0) | (b << 8) | (c << 16) | (d << 24));
}

#define CIRC_SIZE 2048	/* see comment in tty_io.c:do_tty_write() */
#define CIRC_MASK (CIRC_SIZE - 1)
#define circ_empty(circ)     ((circ)->head == (circ)->tail)
#define circ_free(circ)      CIRC_SPACE((circ)->head, (circ)->tail, CIRC_SIZE)
#define circ_cnt(circ)       CIRC_CNT((circ)->head, (circ)->tail, CIRC_SIZE)
#define circ_byte(circ, idx) ((circ)->buf[(idx) & CIRC_MASK])

static struct tty_driver *bfin_jc_driver;
static struct task_struct *bfin_jc_kthread;
static struct tty_port port;
static volatile struct circ_buf bfin_jc_write_buf;

static int
bfin_jc_emudat_manager(void *arg)
{
	uint32_t inbound_len = 0, outbound_len = 0;

	while (!kthread_should_stop()) {
		struct tty_struct *tty = tty_port_tty_get(&port);
		/* no one left to give data to, so sleep */
		if (tty == NULL && circ_empty(&bfin_jc_write_buf)) {
			pr_debug("waiting for readers\n");
			__set_current_state(TASK_UNINTERRUPTIBLE);
			schedule();
			continue;
		}

		/* no data available, so just chill */
		if (!(bfin_read_DBGSTAT() & EMUDIF) && circ_empty(&bfin_jc_write_buf)) {
			pr_debug("waiting for data (in_len = %i) (circ: %i %i)\n",
				inbound_len, bfin_jc_write_buf.tail, bfin_jc_write_buf.head);
			tty_kref_put(tty);
			if (inbound_len)
				schedule();
			else
				schedule_timeout_interruptible(HZ);
			continue;
		}

		/* if incoming data is ready, eat it */
		if (bfin_read_DBGSTAT() & EMUDIF) {
			uint32_t emudat = bfin_read_emudat();
			if (inbound_len == 0) {
				pr_debug("incoming length: 0x%08x\n", emudat);
				inbound_len = emudat;
			} else {
				size_t num_chars = (4 <= inbound_len ? 4 : inbound_len);
				pr_debug("  incoming data: 0x%08x (pushing %zu)\n", emudat, num_chars);
				inbound_len -= num_chars;
				tty_insert_flip_string(&port, (unsigned char *)&emudat, num_chars);
				tty_flip_buffer_push(&port);
			}
		}

		/* if outgoing data is ready, post it */
		if (!(bfin_read_DBGSTAT() & EMUDOF) && !circ_empty(&bfin_jc_write_buf)) {
			if (outbound_len == 0) {
				outbound_len = circ_cnt(&bfin_jc_write_buf);
				bfin_write_emudat(outbound_len);
				pr_debug("outgoing length: 0x%08x\n", outbound_len);
			} else {
				int tail = bfin_jc_write_buf.tail;
				size_t ate = (4 <= outbound_len ? 4 : outbound_len);
				uint32_t emudat =
				bfin_write_emudat_chars(
					circ_byte(&bfin_jc_write_buf, tail + 0),
					circ_byte(&bfin_jc_write_buf, tail + 1),
					circ_byte(&bfin_jc_write_buf, tail + 2),
					circ_byte(&bfin_jc_write_buf, tail + 3)
				);
				bfin_jc_write_buf.tail += ate;
				outbound_len -= ate;
				if (tty)
					tty_wakeup(tty);
				pr_debug("  outgoing data: 0x%08x (pushing %zu)\n", emudat, ate);
			}
		}
		tty_kref_put(tty);
	}

	__set_current_state(TASK_RUNNING);
	return 0;
}

static int
bfin_jc_open(struct tty_struct *tty, struct file *filp)
{
	unsigned long flags;

	spin_lock_irqsave(&port.lock, flags);
	port.count++;
	spin_unlock_irqrestore(&port.lock, flags);
	tty_port_tty_set(&port, tty);
	wake_up_process(bfin_jc_kthread);
	return 0;
}

static void
bfin_jc_close(struct tty_struct *tty, struct file *filp)
{
	unsigned long flags;
	bool last;

	spin_lock_irqsave(&port.lock, flags);
	last = --port.count == 0;
	spin_unlock_irqrestore(&port.lock, flags);
	if (last)
		tty_port_tty_set(&port, NULL);
	wake_up_process(bfin_jc_kthread);
}

/* XXX: we dont handle the put_char() case where we must handle count = 1 */
static int
bfin_jc_circ_write(const unsigned char *buf, int count)
{
	int i;
	count = min(count, circ_free(&bfin_jc_write_buf));
	pr_debug("going to write chunk of %i bytes\n", count);
	for (i = 0; i < count; ++i)
		circ_byte(&bfin_jc_write_buf, bfin_jc_write_buf.head + i) = buf[i];
	bfin_jc_write_buf.head += i;
	return i;
}

#ifndef CONFIG_BFIN_JTAG_COMM_CONSOLE
# define console_lock()
# define console_unlock()
#endif
static int
bfin_jc_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
	int i;
	console_lock();
	i = bfin_jc_circ_write(buf, count);
	console_unlock();
	wake_up_process(bfin_jc_kthread);
	return i;
}

static void
bfin_jc_flush_chars(struct tty_struct *tty)
{
	wake_up_process(bfin_jc_kthread);
}

static int
bfin_jc_write_room(struct tty_struct *tty)
{
	return circ_free(&bfin_jc_write_buf);
}

static int
bfin_jc_chars_in_buffer(struct tty_struct *tty)
{
	return circ_cnt(&bfin_jc_write_buf);
}

static const struct tty_operations bfin_jc_ops = {
	.open            = bfin_jc_open,
	.close           = bfin_jc_close,
	.write           = bfin_jc_write,
	/*.put_char        = bfin_jc_put_char,*/
	.flush_chars     = bfin_jc_flush_chars,
	.write_room      = bfin_jc_write_room,
	.chars_in_buffer = bfin_jc_chars_in_buffer,
};

static int __init bfin_jc_init(void)
{
	int ret;

	bfin_jc_kthread = kthread_create(bfin_jc_emudat_manager, NULL, DRV_NAME);
	if (IS_ERR(bfin_jc_kthread))
		return PTR_ERR(bfin_jc_kthread);

	ret = -ENOMEM;

	bfin_jc_write_buf.head = bfin_jc_write_buf.tail = 0;
	bfin_jc_write_buf.buf = kmalloc(CIRC_SIZE, GFP_KERNEL);
	if (!bfin_jc_write_buf.buf)
		goto err_buf;

	bfin_jc_driver = alloc_tty_driver(1);
	if (!bfin_jc_driver)
		goto err_driver;

	tty_port_init(&port);

	bfin_jc_driver->driver_name  = DRV_NAME;
	bfin_jc_driver->name         = DEV_NAME;
	bfin_jc_driver->type         = TTY_DRIVER_TYPE_SERIAL;
	bfin_jc_driver->subtype      = SERIAL_TYPE_NORMAL;
	bfin_jc_driver->init_termios = tty_std_termios;
	tty_set_operations(bfin_jc_driver, &bfin_jc_ops);
	tty_port_link_device(&port, bfin_jc_driver, 0);

	ret = tty_register_driver(bfin_jc_driver);
	if (ret)
		goto err;

	pr_init(KERN_INFO DRV_NAME ": initialized\n");

	return 0;

 err:
	tty_port_destroy(&port);
	put_tty_driver(bfin_jc_driver);
 err_driver:
	kfree(bfin_jc_write_buf.buf);
 err_buf:
	kthread_stop(bfin_jc_kthread);
	return ret;
}
module_init(bfin_jc_init);

static void __exit bfin_jc_exit(void)
{
	kthread_stop(bfin_jc_kthread);
	kfree(bfin_jc_write_buf.buf);
	tty_unregister_driver(bfin_jc_driver);
	put_tty_driver(bfin_jc_driver);
	tty_port_destroy(&port);
}
module_exit(bfin_jc_exit);

#if defined(CONFIG_BFIN_JTAG_COMM_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
static void
bfin_jc_straight_buffer_write(const char *buf, unsigned count)
{
	unsigned ate = 0;
	while (bfin_read_DBGSTAT() & EMUDOF)
		continue;
	bfin_write_emudat(count);
	while (ate < count) {
		while (bfin_read_DBGSTAT() & EMUDOF)
			continue;
		bfin_write_emudat_chars(buf[ate], buf[ate+1], buf[ate+2], buf[ate+3]);
		ate += 4;
	}
}
#endif

#ifdef CONFIG_BFIN_JTAG_COMM_CONSOLE
static void
bfin_jc_console_write(struct console *co, const char *buf, unsigned count)
{
	if (bfin_jc_kthread == NULL)
		bfin_jc_straight_buffer_write(buf, count);
	else
		bfin_jc_circ_write(buf, count);
}

static struct tty_driver *
bfin_jc_console_device(struct console *co, int *index)
{
	*index = co->index;
	return bfin_jc_driver;
}

static struct console bfin_jc_console = {
	.name    = DEV_NAME,
	.write   = bfin_jc_console_write,
	.device  = bfin_jc_console_device,
	.flags   = CON_ANYTIME | CON_PRINTBUFFER,
	.index   = -1,
};

static int __init bfin_jc_console_init(void)
{
	register_console(&bfin_jc_console);
	return 0;
}
console_initcall(bfin_jc_console_init);
#endif

#ifdef CONFIG_EARLY_PRINTK
static void __init
bfin_jc_early_write(struct console *co, const char *buf, unsigned int count)
{
	bfin_jc_straight_buffer_write(buf, count);
}

static struct console bfin_jc_early_console __initdata = {
	.name   = "early_BFJC",
	.write   = bfin_jc_early_write,
	.flags   = CON_ANYTIME | CON_PRINTBUFFER,
	.index   = -1,
};

struct console * __init
bfin_jc_early_init(unsigned int port, unsigned int cflag)
{
	return &bfin_jc_early_console;
}
#endif

MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.org>");
MODULE_DESCRIPTION("TTY over Blackfin JTAG Communication");
MODULE_LICENSE("GPL");
Commit	Line	Data
e3b3d0f5	1	// SPDX-License-Identifier: GPL-2.0+
0b914218 MF	2	/*
	3	* TTY over Blackfin JTAG Communication
	4	*
	5	* Copyright 2008-2009 Analog Devices Inc.
	6	*
	7	* Enter bugs at http://blackfin.uclinux.org/
0b914218 MF	8	*/
0b914218 MF	9
56578abf MF	10	#define DRV_NAME "bfin-jtag-comm"
	11	#define DEV_NAME "ttyBFJC"
	12	#define pr_fmt(fmt) DRV_NAME ": " fmt
	13
0b914218 MF	14	#include <linux/circ_buf.h>
	15	#include <linux/console.h>
	16	#include <linux/delay.h>
	17	#include <linux/err.h>
	18	#include <linux/kernel.h>
	19	#include <linux/kthread.h>
	20	#include <linux/module.h>
	21	#include <linux/mutex.h>
	22	#include <linux/sched.h>
5a0e3ad6	23	#include <linux/slab.h>
0b914218 MF	24	#include <linux/tty.h>
	25	#include <linux/tty_driver.h>
	26	#include <linux/tty_flip.h>
60063497	27	#include <linux/atomic.h>
0b914218	28
56578abf MF	29	#define pr_init(fmt, args...) ({ static const __initconst char __fmt[] = fmt; printk(__fmt, ## args); })
56578abf MF	30
0b914218 MF	31	/* See the Debug/Emulation chapter in the HRM */
	32	#define EMUDOF 0x00000001 /* EMUDAT_OUT full & valid */
	33	#define EMUDIF 0x00000002 /* EMUDAT_IN full & valid */
	34	#define EMUDOOVF 0x00000004 /* EMUDAT_OUT overflow */
	35	#define EMUDIOVF 0x00000008 /* EMUDAT_IN overflow */
	36
0b914218 MF	37	static inline uint32_t bfin_write_emudat(uint32_t emudat)
	38	{
	39	__asm__ __volatile__("emudat = %0;" : : "d"(emudat));
	40	return emudat;
	41	}
	42
	43	static inline uint32_t bfin_read_emudat(void)
	44	{
	45	uint32_t emudat;
	46	__asm__ __volatile__("%0 = emudat;" : "=d"(emudat));
	47	return emudat;
	48	}
	49
	50	static inline uint32_t bfin_write_emudat_chars(char a, char b, char c, char d)
	51	{
	52	return bfin_write_emudat((a << 0) \| (b << 8) \| (c << 16) \| (d << 24));
	53	}
	54
	55	#define CIRC_SIZE 2048 /* see comment in tty_io.c:do_tty_write() */
	56	#define CIRC_MASK (CIRC_SIZE - 1)
	57	#define circ_empty(circ) ((circ)->head == (circ)->tail)
	58	#define circ_free(circ) CIRC_SPACE((circ)->head, (circ)->tail, CIRC_SIZE)
	59	#define circ_cnt(circ) CIRC_CNT((circ)->head, (circ)->tail, CIRC_SIZE)
	60	#define circ_byte(circ, idx) ((circ)->buf[(idx) & CIRC_MASK])
	61
	62	static struct tty_driver *bfin_jc_driver;
	63	static struct task_struct *bfin_jc_kthread;
560460b8	64	static struct tty_port port;
0b914218 MF	65	static volatile struct circ_buf bfin_jc_write_buf;
	66
	67	static int
	68	bfin_jc_emudat_manager(void *arg)
	69	{
	70	uint32_t inbound_len = 0, outbound_len = 0;
	71
	72	while (!kthread_should_stop()) {
e63f9f74	73	struct tty_struct *tty = tty_port_tty_get(&port);
0b914218	74	/* no one left to give data to, so sleep */
e63f9f74	75	if (tty == NULL && circ_empty(&bfin_jc_write_buf)) {
56578abf	76	pr_debug("waiting for readers\n");
0b914218 MF	77	__set_current_state(TASK_UNINTERRUPTIBLE);
0b914218 MF	78	schedule();
e63f9f74	79	continue;
0b914218 MF	80	}
	81
	82	/* no data available, so just chill */
	83	if (!(bfin_read_DBGSTAT() & EMUDIF) && circ_empty(&bfin_jc_write_buf)) {
56578abf	84	pr_debug("waiting for data (in_len = %i) (circ: %i %i)\n",
0b914218	85	inbound_len, bfin_jc_write_buf.tail, bfin_jc_write_buf.head);
e63f9f74	86	tty_kref_put(tty);
0b914218 MF	87	if (inbound_len)
	88	schedule();
	89	else
	90	schedule_timeout_interruptible(HZ);
	91	continue;
	92	}
	93
	94	/* if incoming data is ready, eat it */
	95	if (bfin_read_DBGSTAT() & EMUDIF) {
2e124b4a JS	96	uint32_t emudat = bfin_read_emudat();
	97	if (inbound_len == 0) {
	98	pr_debug("incoming length: 0x%08x\n", emudat);
	99	inbound_len = emudat;
	100	} else {
	101	size_t num_chars = (4 <= inbound_len ? 4 : inbound_len);
	102	pr_debug(" incoming data: 0x%08x (pushing %zu)\n", emudat, num_chars);
	103	inbound_len -= num_chars;
	104	tty_insert_flip_string(&port, (unsigned char *)&emudat, num_chars);
	105	tty_flip_buffer_push(&port);
0b914218	106	}
0b914218 MF	107	}
	108
	109	/* if outgoing data is ready, post it */
	110	if (!(bfin_read_DBGSTAT() & EMUDOF) && !circ_empty(&bfin_jc_write_buf)) {
	111	if (outbound_len == 0) {
	112	outbound_len = circ_cnt(&bfin_jc_write_buf);
	113	bfin_write_emudat(outbound_len);
56578abf	114	pr_debug("outgoing length: 0x%08x\n", outbound_len);
0b914218	115	} else {
0b914218 MF	116	int tail = bfin_jc_write_buf.tail;
	117	size_t ate = (4 <= outbound_len ? 4 : outbound_len);
	118	uint32_t emudat =
	119	bfin_write_emudat_chars(
	120	circ_byte(&bfin_jc_write_buf, tail + 0),
	121	circ_byte(&bfin_jc_write_buf, tail + 1),
	122	circ_byte(&bfin_jc_write_buf, tail + 2),
	123	circ_byte(&bfin_jc_write_buf, tail + 3)
	124	);
	125	bfin_jc_write_buf.tail += ate;
	126	outbound_len -= ate;
0b914218 MF	127	if (tty)
0b914218 MF	128	tty_wakeup(tty);
56578abf	129	pr_debug(" outgoing data: 0x%08x (pushing %zu)\n", emudat, ate);
0b914218 MF	130	}
0b914218 MF	131	}
e63f9f74	132	tty_kref_put(tty);
0b914218 MF	133	}
	134
	135	__set_current_state(TASK_RUNNING);
	136	return 0;
	137	}
	138
	139	static int
	140	bfin_jc_open(struct tty_struct tty, struct file filp)
	141	{
e63f9f74 JS	142	unsigned long flags;
	143
	144	spin_lock_irqsave(&port.lock, flags);
560460b8	145	port.count++;
e63f9f74 JS	146	spin_unlock_irqrestore(&port.lock, flags);
e63f9f74 JS	147	tty_port_tty_set(&port, tty);
0b914218	148	wake_up_process(bfin_jc_kthread);
0b914218 MF	149	return 0;
	150	}
	151
	152	static void
	153	bfin_jc_close(struct tty_struct tty, struct file filp)
	154	{
e63f9f74 JS	155	unsigned long flags;
	156	bool last;
	157
	158	spin_lock_irqsave(&port.lock, flags);
	159	last = --port.count == 0;
	160	spin_unlock_irqrestore(&port.lock, flags);
	161	if (last)
	162	tty_port_tty_set(&port, NULL);
0b914218	163	wake_up_process(bfin_jc_kthread);
0b914218 MF	164	}
	165
	166	/* XXX: we dont handle the put_char() case where we must handle count = 1 */
	167	static int
	168	bfin_jc_circ_write(const unsigned char *buf, int count)
	169	{
	170	int i;
	171	count = min(count, circ_free(&bfin_jc_write_buf));
56578abf	172	pr_debug("going to write chunk of %i bytes\n", count);
0b914218 MF	173	for (i = 0; i < count; ++i)
	174	circ_byte(&bfin_jc_write_buf, bfin_jc_write_buf.head + i) = buf[i];
	175	bfin_jc_write_buf.head += i;
	176	return i;
	177	}
	178
	179	#ifndef CONFIG_BFIN_JTAG_COMM_CONSOLE
ac751efa TH	180	# define console_lock()
ac751efa TH	181	# define console_unlock()
0b914218 MF	182	#endif
	183	static int
	184	bfin_jc_write(struct tty_struct tty, const unsigned char buf, int count)
	185	{
	186	int i;
ac751efa	187	console_lock();
0b914218	188	i = bfin_jc_circ_write(buf, count);
ac751efa	189	console_unlock();
0b914218 MF	190	wake_up_process(bfin_jc_kthread);
	191	return i;
	192	}
	193
	194	static void
	195	bfin_jc_flush_chars(struct tty_struct *tty)
	196	{
	197	wake_up_process(bfin_jc_kthread);
	198	}
	199
	200	static int
	201	bfin_jc_write_room(struct tty_struct *tty)
	202	{
	203	return circ_free(&bfin_jc_write_buf);
	204	}
	205
	206	static int
	207	bfin_jc_chars_in_buffer(struct tty_struct *tty)
	208	{
	209	return circ_cnt(&bfin_jc_write_buf);
	210	}
	211
1cceefd3	212	static const struct tty_operations bfin_jc_ops = {
0b914218 MF	213	.open = bfin_jc_open,
	214	.close = bfin_jc_close,
	215	.write = bfin_jc_write,
	216	/.put_char = bfin_jc_put_char,/
	217	.flush_chars = bfin_jc_flush_chars,
	218	.write_room = bfin_jc_write_room,
	219	.chars_in_buffer = bfin_jc_chars_in_buffer,
0b914218 MF	220	};
	221
	222	static int __init bfin_jc_init(void)
	223	{
	224	int ret;
	225
	226	bfin_jc_kthread = kthread_create(bfin_jc_emudat_manager, NULL, DRV_NAME);
	227	if (IS_ERR(bfin_jc_kthread))
	228	return PTR_ERR(bfin_jc_kthread);
	229
	230	ret = -ENOMEM;
	231
	232	bfin_jc_write_buf.head = bfin_jc_write_buf.tail = 0;
	233	bfin_jc_write_buf.buf = kmalloc(CIRC_SIZE, GFP_KERNEL);
	234	if (!bfin_jc_write_buf.buf)
d9d691f5	235	goto err_buf;
0b914218 MF	236
	237	bfin_jc_driver = alloc_tty_driver(1);
	238	if (!bfin_jc_driver)
d9d691f5	239	goto err_driver;
0b914218	240
191c5f10 JS	241	tty_port_init(&port);
191c5f10 JS	242
0b914218 MF	243	bfin_jc_driver->driver_name = DRV_NAME;
	244	bfin_jc_driver->name = DEV_NAME;
	245	bfin_jc_driver->type = TTY_DRIVER_TYPE_SERIAL;
	246	bfin_jc_driver->subtype = SERIAL_TYPE_NORMAL;
	247	bfin_jc_driver->init_termios = tty_std_termios;
	248	tty_set_operations(bfin_jc_driver, &bfin_jc_ops);
b19e2ca7	249	tty_port_link_device(&port, bfin_jc_driver, 0);
0b914218 MF	250
	251	ret = tty_register_driver(bfin_jc_driver);
	252	if (ret)
	253	goto err;
	254
	255	pr_init(KERN_INFO DRV_NAME ": initialized\n");
	256
	257	return 0;
	258
	259	err:
191c5f10	260	tty_port_destroy(&port);
0b914218	261	put_tty_driver(bfin_jc_driver);
d9d691f5	262	err_driver:
0b914218	263	kfree(bfin_jc_write_buf.buf);
d9d691f5	264	err_buf:
0b914218 MF	265	kthread_stop(bfin_jc_kthread);
	266	return ret;
	267	}
	268	module_init(bfin_jc_init);
	269
	270	static void __exit bfin_jc_exit(void)
	271	{
	272	kthread_stop(bfin_jc_kthread);
	273	kfree(bfin_jc_write_buf.buf);
	274	tty_unregister_driver(bfin_jc_driver);
	275	put_tty_driver(bfin_jc_driver);
191c5f10	276	tty_port_destroy(&port);
0b914218 MF	277	}
	278	module_exit(bfin_jc_exit);
	279
	280	#if defined(CONFIG_BFIN_JTAG_COMM_CONSOLE) \|\| defined(CONFIG_EARLY_PRINTK)
	281	static void
	282	bfin_jc_straight_buffer_write(const char *buf, unsigned count)
	283	{
	284	unsigned ate = 0;
	285	while (bfin_read_DBGSTAT() & EMUDOF)
	286	continue;
	287	bfin_write_emudat(count);
	288	while (ate < count) {
	289	while (bfin_read_DBGSTAT() & EMUDOF)
	290	continue;
	291	bfin_write_emudat_chars(buf[ate], buf[ate+1], buf[ate+2], buf[ate+3]);
	292	ate += 4;
	293	}
	294	}
	295	#endif
	296
	297	#ifdef CONFIG_BFIN_JTAG_COMM_CONSOLE
	298	static void
	299	bfin_jc_console_write(struct console co, const char buf, unsigned count)
	300	{
	301	if (bfin_jc_kthread == NULL)
	302	bfin_jc_straight_buffer_write(buf, count);
	303	else
	304	bfin_jc_circ_write(buf, count);
	305	}
	306
	307	static struct tty_driver *
	308	bfin_jc_console_device(struct console co, int index)
	309	{
	310	*index = co->index;
	311	return bfin_jc_driver;
	312	}
	313
	314	static struct console bfin_jc_console = {
	315	.name = DEV_NAME,
	316	.write = bfin_jc_console_write,
	317	.device = bfin_jc_console_device,
	318	.flags = CON_ANYTIME \| CON_PRINTBUFFER,
	319	.index = -1,
	320	};
	321
	322	static int __init bfin_jc_console_init(void)
	323	{
	324	register_console(&bfin_jc_console);
	325	return 0;
	326	}
	327	console_initcall(bfin_jc_console_init);
	328	#endif
	329
	330	#ifdef CONFIG_EARLY_PRINTK
	331	static void __init
	332	bfin_jc_early_write(struct console co, const char buf, unsigned int count)
	333	{
	334	bfin_jc_straight_buffer_write(buf, count);
	335	}
	336
f8294523	337	static struct console bfin_jc_early_console __initdata = {
0b914218 MF	338	.name = "early_BFJC",
	339	.write = bfin_jc_early_write,
	340	.flags = CON_ANYTIME \| CON_PRINTBUFFER,
	341	.index = -1,
	342	};
	343
	344	struct console * __init
	345	bfin_jc_early_init(unsigned int port, unsigned int cflag)
	346	{
	347	return &bfin_jc_early_console;
	348	}
	349	#endif
	350
	351	MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.org>");
	352	MODULE_DESCRIPTION("TTY over Blackfin JTAG Communication");
	353	MODULE_LICENSE("GPL");