tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers

The blackfin architecture is getting removed, so these drivers
are not needed any more.
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Aaron Wu <aaron.wu@analog.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/tty/Kconfig

@@ -151,19 +151,6 @@ config LEGACY_PTY_COUNT
 	  When not in use, each legacy PTY occupies 12 bytes on 32-bit
 	  architectures and 24 bytes on 64-bit architectures.
 
-config BFIN_JTAG_COMM
-	tristate "Blackfin JTAG Communication"
-	depends on BLACKFIN
-	help
-	  Add support for emulating a TTY device over the Blackfin JTAG.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called bfin_jtag_comm.
-
-config BFIN_JTAG_COMM_CONSOLE
-	bool "Console on Blackfin JTAG"
-	depends on BFIN_JTAG_COMM=y
-
 config SERIAL_NONSTANDARD
 	bool "Non-standard serial port support"
 	depends on HAS_IOMEM

drivers/tty/Makefile

@@ -20,7 +20,6 @@ obj-$(CONFIG_SERIAL_DEV_BUS)	+= serdev/
 
 # tty drivers
 obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o
-obj-$(CONFIG_BFIN_JTAG_COMM)	+= bfin_jtag_comm.o
 obj-$(CONFIG_CYCLADES)		+= cyclades.o
 obj-$(CONFIG_ISI)		+= isicom.o
 obj-$(CONFIG_MOXA_INTELLIO)	+= moxa.o

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");

drivers/tty/hvc/Kconfig

@@ -88,15 +88,6 @@ config HVC_DCC
 	 driver. This console is used through a JTAG only on ARM. If you don't have
 	 a JTAG then you probably don't want this option.
 
-config HVC_BFIN_JTAG
-	bool "Blackfin JTAG console"
-	depends on BLACKFIN
-	select HVC_DRIVER
-	help
-	 This console uses the Blackfin JTAG to create a console under the
-	 the HVC driver.  If you don't have JTAG, then you probably don't
-	 want this option.
-
 config HVCS
 	tristate "IBM Hypervisor Virtual Console Server support"
 	depends on PPC_PSERIES && HVC_CONSOLE

drivers/tty/hvc/Makefile

@@ -10,5 +10,4 @@ obj-$(CONFIG_HVC_IRQ)		+= hvc_irq.o
 obj-$(CONFIG_HVC_XEN)		+= hvc_xen.o
 obj-$(CONFIG_HVC_IUCV)		+= hvc_iucv.o
 obj-$(CONFIG_HVC_UDBG)		+= hvc_udbg.o
-obj-$(CONFIG_HVC_BFIN_JTAG)	+= hvc_bfin_jtag.o
 obj-$(CONFIG_HVCS)		+= hvcs.o

drivers/tty/hvc/hvc_bfin_jtag.c

-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Console via Blackfin JTAG Communication
- *
- * Copyright 2008-2011 Analog Devices Inc.
- *
- * Enter bugs at http://blackfin.uclinux.org/
- */
-
-#include <linux/console.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-
-#include "hvc_console.h"
-
-/* 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 */
-
-/* Helper functions to glue the register API to simple C operations */
-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;
-}
-
-/* Send data to the host */
-static int hvc_bfin_put_chars(uint32_t vt, const char *buf, int count)
-{
-	static uint32_t outbound_len;
-	uint32_t emudat;
-	int ret;
-
-	if (bfin_read_DBGSTAT() & EMUDOF)
-		return 0;
-
-	if (!outbound_len) {
-		outbound_len = count;
-		bfin_write_emudat(outbound_len);
-		return 0;
-	}
-
-	ret = min(outbound_len, (uint32_t)4);
-	memcpy(&emudat, buf, ret);
-	bfin_write_emudat(emudat);
-	outbound_len -= ret;
-
-	return ret;
-}
-
-/* Receive data from the host */
-static int hvc_bfin_get_chars(uint32_t vt, char *buf, int count)
-{
-	static uint32_t inbound_len;
-	uint32_t emudat;
-	int ret;
-
-	if (!(bfin_read_DBGSTAT() & EMUDIF))
-		return 0;
-	emudat = bfin_read_emudat();
-
-	if (!inbound_len) {
-		inbound_len = emudat;
-		return 0;
-	}
-
-	ret = min(inbound_len, (uint32_t)4);
-	memcpy(buf, &emudat, ret);
-	inbound_len -= ret;
-
-	return ret;
-}
-
-/* Glue the HVC layers to the Blackfin layers */
-static const struct hv_ops hvc_bfin_get_put_ops = {
-	.get_chars = hvc_bfin_get_chars,
-	.put_chars = hvc_bfin_put_chars,
-};
-
-static int __init hvc_bfin_console_init(void)
-{
-	hvc_instantiate(0, 0, &hvc_bfin_get_put_ops);
-	return 0;
-}
-console_initcall(hvc_bfin_console_init);
-
-static int __init hvc_bfin_init(void)
-{
-	hvc_alloc(0, 0, &hvc_bfin_get_put_ops, 128);
-	return 0;
-}
-device_initcall(hvc_bfin_init);