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Subject[PATCH] Remove duplicate code for RS485 communications
Hi Alan,

I didn't understand who is the actual maintainer of this
code, and I didn't receive any feedback from the maintainers of
the cris architecture. Therefore, I follow Andy's suggestion of
sending this patch to you, putting LKML in CC.

With commit number c26c56c0f40e200e61d1390629c806f6adaffbcc you
introduced a new general data structure to handle RS485 serial
communications (starting from the one defined for the cris platform).

I think that now the cris architecture should use this new general
data structure instead of its old "private" one...

Unfortunately, I don't have any cris platform to test this patch (I
could only check that it compiles without errors). But maybe you know
some volunteer who can test this patch...

Many thanks,

Claudio













From 1278f84de8a9c7b5ea0d15b292ad0a4dfeb71134 Mon Sep 17 00:00:00 2001
From: Claudio Scordino <claudio@evidence.eu.com>
Date: Sun, 11 Jan 2009 22:55:50 +0100
Subject: [PATCH 1/1] RS485 support on Cris rewritten in order to use new serial_rs485 data structure


Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
---
arch/cris/include/asm/ioctls.h | 5 +-
arch/cris/include/asm/rs485.h | 8 +--
arch/cris/include/asm/termios.h | 1 +
drivers/serial/crisv10.c | 79 ++++++++++++++++++++++++++++-----------
drivers/serial/crisv10.h | 2 +-
5 files changed, 65 insertions(+), 30 deletions(-)

diff --git a/arch/cris/include/asm/ioctls.h b/arch/cris/include/asm/ioctls.h
index 4f4e525..35bbc18 100644
--- a/arch/cris/include/asm/ioctls.h
+++ b/arch/cris/include/asm/ioctls.h
@@ -74,8 +74,9 @@
#define TIOCSHAYESESP 0x545F /* Set Hayes ESP configuration */
#define FIOQSIZE 0x5460

-#define TIOCSERSETRS485 0x5461 /* enable rs-485 */
-#define TIOCSERWRRS485 0x5462 /* write rs-485 */
+#define TIOCSERSETRS485 0x5461 /* enable rs-485 (deprecated) */
+#define TIOCSERWRRS485 0x5462 /* write rs-485 */
+#define TIOCSRS485 0x5463 /* enable rs-485 */

/* Used for packet mode */
#define TIOCPKT_DATA 0
diff --git a/arch/cris/include/asm/rs485.h b/arch/cris/include/asm/rs485.h
index c331c51..ad40f9f 100644
--- a/arch/cris/include/asm/rs485.h
+++ b/arch/cris/include/asm/rs485.h
@@ -1,15 +1,13 @@
/* RS-485 structures */

-/* RS-485 support */
-/* Used with ioctl() TIOCSERSETRS485 */
+/* Used with ioctl() TIOCSERSETRS485 for backward compatibility!
+ * XXX: Do not use it for new code!
+ */
struct rs485_control {
unsigned short rts_on_send;
unsigned short rts_after_sent;
unsigned long delay_rts_before_send;
unsigned short enabled;
-#ifdef __KERNEL__
- int disable_serial_loopback;
-#endif
};

/* Used with ioctl() TIOCSERWRRS485 */
diff --git a/arch/cris/include/asm/termios.h b/arch/cris/include/asm/termios.h
index b0124e6..1265109 100644
--- a/arch/cris/include/asm/termios.h
+++ b/arch/cris/include/asm/termios.h
@@ -4,6 +4,7 @@
#include <asm/termbits.h>
#include <asm/ioctls.h>
#include <asm/rs485.h>
+#include <linux/serial.h>

struct winsize {
unsigned short ws_row;
diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index e642c22..ddf41bb 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -456,7 +456,6 @@ static struct e100_serial rs_table[] = {

#define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial))

-static struct ktermios *serial_termios[NR_PORTS];
#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
static struct fast_timer fast_timers[NR_PORTS];
#endif
@@ -1391,7 +1390,7 @@ static inline void e100_disable_rx_irq(struct e100_serial *info)
#if defined(CONFIG_ETRAX_RS485)
/* Enable RS-485 mode on selected port. This is UGLY. */
static int
-e100_enable_rs485(struct tty_struct *tty,struct rs485_control *r)
+e100_enable_rs485(struct tty_struct *tty, struct serial_rs485 *r)
{
struct e100_serial * info = (struct e100_serial *)tty->driver_data;

@@ -1409,13 +1408,11 @@ e100_enable_rs485(struct tty_struct *tty,struct rs485_control *r)
CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1);
#endif

- info->rs485.rts_on_send = 0x01 & r->rts_on_send;
- info->rs485.rts_after_sent = 0x01 & r->rts_after_sent;
+ info->rs485.flags = r->flags;
if (r->delay_rts_before_send >= 1000)
info->rs485.delay_rts_before_send = 1000;
else
info->rs485.delay_rts_before_send = r->delay_rts_before_send;
- info->rs485.enabled = r->enabled;
/* printk("rts: on send = %i, after = %i, enabled = %i",
info->rs485.rts_on_send,
info->rs485.rts_after_sent,
@@ -1430,17 +1427,18 @@ e100_write_rs485(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct e100_serial * info = (struct e100_serial *)tty->driver_data;
- int old_enabled = info->rs485.enabled;
+ int old_value = (info->rs485.flags) & SER_RS485_ENABLED;

/* rs485 is always implicitly enabled if we're using the ioctl()
- * but it doesn't have to be set in the rs485_control
+ * but it doesn't have to be set in the serial_rs485
* (to be backward compatible with old apps)
* So we store, set and restore it.
*/
- info->rs485.enabled = 1;
+ info->rs485.flags |= SER_RS485_ENABLED;
/* rs_write now deals with RS485 if enabled */
count = rs_write(tty, buf, count);
- info->rs485.enabled = old_enabled;
+ if (!old_value)
+ info->rs485.flags &= ~(SER_RS485_ENABLED);
return count;
}

@@ -1451,7 +1449,7 @@ static void rs485_toggle_rts_timer_function(unsigned long data)
struct e100_serial *info = (struct e100_serial *)data;

fast_timers_rs485[info->line].function = NULL;
- e100_rts(info, info->rs485.rts_after_sent);
+ e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND));
#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
e100_enable_rx(info);
e100_enable_rx_irq(info);
@@ -1647,7 +1645,7 @@ transmit_chars_dma(struct e100_serial *info)
info->tr_running = 0;

#if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
- if (info->rs485.enabled) {
+ if ((info->rs485.flags) & SER_RS485_ENABLED) {
/* Set a short timer to toggle RTS */
start_one_shot_timer(&fast_timers_rs485[info->line],
rs485_toggle_rts_timer_function,
@@ -2577,7 +2575,7 @@ static void handle_ser_tx_interrupt(struct e100_serial *info)
info->icount.tx++;
if (info->xmit.head == info->xmit.tail) {
#if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
- if (info->rs485.enabled) {
+ if ((info->rs485.flags) & SER_RS485_ENABLED) {
/* Set a short timer to toggle RTS */
start_one_shot_timer(&fast_timers_rs485[info->line],
rs485_toggle_rts_timer_function,
@@ -3218,7 +3216,7 @@ rs_write(struct tty_struct *tty,
#if defined(CONFIG_ETRAX_RS485)
struct e100_serial *info = (struct e100_serial *)tty->driver_data;

- if (info->rs485.enabled)
+ if ((info->rs485.flags) & SER_RS485_ENABLED)
{
/* If we are in RS-485 mode, we need to toggle RTS and disable
* the receiver before initiating a DMA transfer
@@ -3228,7 +3226,7 @@ rs_write(struct tty_struct *tty,
fast_timers_rs485[info->line].function = NULL;
del_fast_timer(&fast_timers_rs485[info->line]);
#endif
- e100_rts(info, info->rs485.rts_on_send);
+ e100_rts(info, (info->rs485.flags & SER_RS485_RTS_ON_SEND));
#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
e100_disable_rx(info);
e100_enable_rx_irq(info);
@@ -3242,7 +3240,7 @@ rs_write(struct tty_struct *tty,
count = rs_raw_write(tty, buf, count);

#if defined(CONFIG_ETRAX_RS485)
- if (info->rs485.enabled)
+ if ((info->rs485.flags) & SER_RS485_ENABLED)
{
unsigned int val;
/* If we are in RS-485 mode the following has to be done:
@@ -3263,7 +3261,7 @@ rs_write(struct tty_struct *tty,
get_lsr_info(info, &val);
}while (!(val & TIOCSER_TEMT));

- e100_rts(info, info->rs485.rts_after_sent);
+ e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND));

#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
e100_enable_rx(info);
@@ -3678,14 +3676,51 @@ rs_ioctl(struct tty_struct *tty, struct file * file,
#if defined(CONFIG_ETRAX_RS485)
case TIOCSERSETRS485:
{
+ /* In this ioctl we still use the old structure
+ * rs485_control for backward compatibility
+ * (if we use serial_rs485, then old user-level code
+ * wouldn't work anymore...).
+ * The use of this ioctl is deprecated: use TIOCSRS485
+ * instead.*/
struct rs485_control rs485ctrl;
+ struct serial_rs485 rs485data;
+ printk(KERN_INFO, "The use of this ioctl is deprecated. Use TIOCSRS485 instead\n");
if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg,
sizeof(rs485ctrl)))
return -EFAULT;

- return e100_enable_rs485(tty, &rs485ctrl);
+ rs485data->delay_rts_before_send = rs485ctrl->delay_rts_before_send;
+ if (rs485ctrl->enabled)
+ rs485data->flags |= SER_RS485_ENABLED;
+ else
+ rs485data->flags &= ~(SER_RS485_ENABLED);
+
+ if (rs485ctrl->rts_on_send)
+ rs485data->flags |= SER_RS485_RTS_ON_SEND;
+ else
+ rs485data->flags &= ~(SER_RS485_RTS_ON_SEND);
+
+ if (rs485ctrl->rts_after_sent)
+ rs485data->flags |= SER_RS485_RTS_AFTER_SEND;
+ else
+ rs485data->flags &= ~(SER_RS485_RTS_AFTER_SEND);
+
+ return e100_enable_rs485(tty, &rs485data);
}

+ case TIOCSRS485:
+ {
+ /* This is the new version of TIOCSRS485, with new
+ * data structure serial_rs485 */
+ struct serial_rs485 rs485data;
+ if (copy_from_user(&rs485data, (struct rs485_control *)arg,
+ sizeof(rs485data)))
+ return -EFAULT;
+
+ return e100_enable_rs485(tty, &rs485data);
+ }
+
+
case TIOCSERWRRS485:
{
struct rs485_write rs485wr;
@@ -3827,8 +3862,8 @@ rs_close(struct tty_struct *tty, struct file * filp)
/* port closed */

#if defined(CONFIG_ETRAX_RS485)
- if (info->rs485.enabled) {
- info->rs485.enabled = 0;
+ if ((info->rs485.flags) & SER_RS485_ENABLED) {
+ info->rs485.flags &= ~(SER_RS485_ENABLED);
#if defined(CONFIG_ETRAX_RS485_ON_PA)
*R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit);
#endif
@@ -4493,10 +4528,10 @@ rs_init(void)

#if defined(CONFIG_ETRAX_RS485)
/* Set sane defaults */
- info->rs485.rts_on_send = 0;
- info->rs485.rts_after_sent = 1;
+ info->rs485.flags &= ~(SER_RS485_RTS_ON_SEND);
+ info->rs485.flags |= SER_RS485_RTS_AFTER_SEND;
info->rs485.delay_rts_before_send = 0;
- info->rs485.enabled = 0;
+ info->rs485.flags &= ~(SER_RS485_ENABLED);
#endif
INIT_WORK(&info->work, do_softint);

diff --git a/drivers/serial/crisv10.h b/drivers/serial/crisv10.h
index f36a729..ea0beb4 100644
--- a/drivers/serial/crisv10.h
+++ b/drivers/serial/crisv10.h
@@ -125,7 +125,7 @@ struct e100_serial {
int errorcode;

#ifdef CONFIG_ETRAX_RS485
- struct rs485_control rs485; /* RS-485 support */
+ struct serial_rs485 rs485; /* RS-485 support */
#endif
};

--
1.5.4.3
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