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From 5f645d0668b469c4738fe1e9d3994287a519d0f3 Mon Sep 17 00:00:00 2001
From: Kurt Mahan <kmahan@freescale.com>
Date: Tue, 8 Jul 2008 15:57:47 -0600
Subject: [PATCH] Add Coldfire IRDA support in serial driver.
LTIBName: mcfv4e-irda
Signed-off-by: Kurt Mahan <kmahan@freescale.com>
Signed-off-by: Huan, Wang <b18965@freescale.com>
---
drivers/serial/Kconfig | 6 ++
drivers/serial/mcfserial.c | 110 ++++++++++++++++++++++++++++++++++++++++++--
net/irda/irlap.c | 2 +-
3 files changed, 113 insertions(+), 5 deletions(-)
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -979,6 +979,12 @@ config SERIAL_COLDFIRE
This driver supports the built-in serial ports of the Motorola ColdFire
family of CPUs.
+config SERIAL_COLDFIRE_IRDA
+ bool "ColdFire IRDA support"
+ depends on SERIAL_COLDFIRE
+ help
+ This driver supports IRDA on the Motorola ColdFire.
+
config SERIAL_MCF
bool "Coldfire serial support (new style driver)"
depends on COLDFIRE
--- a/drivers/serial/mcfserial.c
+++ b/drivers/serial/mcfserial.c
@@ -109,6 +109,10 @@ static struct tty_driver *mcfrs_serial_d
#define IRQBASE 73
#endif
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+#define SERIAL_IRDA_LINE (2)
+#endif
+
/*
* Configuration table, UARTs to look for at startup.
*/
@@ -393,6 +397,9 @@ static inline void receive_chars(struct
static inline void transmit_chars(struct mcf_serial *info)
{
volatile unsigned char *uartp;
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ int i;
+#endif
uartp = info->addr;
@@ -404,13 +411,36 @@ static inline void transmit_chars(struct
}
if ((info->xmit_cnt <= 0) || info->tty->stopped) {
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ if (info->line == SERIAL_IRDA_LINE) {
+ /* Enable receiver for IRDA */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX;
+ /* reset RX */
+ uartp[MCFUART_UCR] = MCFUART_UCR_TXENABLE | MCFUART_UCR_RXENABLE;
+ }
+#endif
info->imr &= ~MCFUART_UIR_TXREADY;
uartp[MCFUART_UIMR] = info->imr;
return;
}
while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) {
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ if (info->line == SERIAL_IRDA_LINE) {
+ while (!(uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY));
+ i = 0;
+ /* delay for settle */
+#if defined(CONFIG_M548X)
+ udelay(1);
+#elif defined(CONFIG_M547X)
+ udelay(2);
+#else
+ while (i++ < 25000) udelay(1);
+#endif
+ }
+#endif
uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++];
+
info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
info->stats.tx++;
if (--info->xmit_cnt <= 0)
@@ -567,6 +597,28 @@ static int startup(struct mcf_serial * i
*/
mcfrs_change_speed(info);
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ if (info->line == SERIAL_IRDA_LINE) {
+ /* Put PSC in IrDA mode */
+ MCF_PSC_SICR(info->line) = MCF_PSC_SICR_SIM_SIR;
+
+ /* Set pulse width to 1.6 uS */
+ MCF_PSC_IRSDR(info->line) = (uint8_t)
+ (16 * (CONFIG_MCFCLK / 10000000));
+ MCF_PSC_IRCR1(info->line) = MCF_PSC_IRCR1_SPUL;
+ MCF_PSC_IRCR2(info->line) = 0;
+
+ /* Enable RTS to send */
+ MCF_PSC_OPSET(info->line) = MCF_PSC_OPSET_RTS;
+
+ /* Setup FIFO Alarms */
+ MCF_PSC_RFAR(info->line) = MCF_PSC_RFAR_ALARM(248);
+ MCF_PSC_TFAR(info->line) = MCF_PSC_TFAR_ALARM(248);
+
+ MCF_PSC_RFCR(info->line) = MCF_PSC_RFCR_FRMEN | MCF_PSC_RFCR_GR(4);
+ MCF_PSC_TFCR(info->line) = MCF_PSC_TFCR_FRMEN | MCF_PSC_RFCR_GR(4);
+ }
+#endif
/*
* Lastly enable the UART transmitter and receiver, and
* interrupt enables.
@@ -588,10 +640,20 @@ static void shutdown(struct mcf_serial *
{
volatile unsigned char *uartp;
unsigned long flags;
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ unsigned long delay_counter = 0;
+#endif
if (!(info->flags & ASYNC_INITIALIZED))
return;
-
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ uartp = (volatile unsigned char *) info->addr;
+ while (!(uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY)) {
+ if(delay_counter++ > 25000)
+ break;
+ udelay(10);
+ }
+#endif
#ifdef SERIAL_DEBUG_OPEN
printk("Shutting down serial port %d (irq %d)....\n", info->line,
info->irq);
@@ -820,10 +882,19 @@ static int mcfrs_write(struct tty_struct
local_irq_disable();
uartp = info->addr;
+
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ if (info->line == SERIAL_IRDA_LINE) {
+ /* Disable IRDA receiver*/
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
+ uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
+
+ uartp[MCFUART_UCR] = MCFUART_UCR_TXENABLE;
+ }
+#endif
info->imr |= MCFUART_UIR_TXREADY;
uartp[MCFUART_UIMR] = info->imr;
local_irq_restore(flags);
-
return total;
}
@@ -884,9 +955,21 @@ static void mcfrs_throttle(struct tty_st
if (serial_paranoia_check(info, tty->name, "mcfrs_throttle"))
return;
-
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ if (I_IXOFF(tty)) {
+ /* Force STOP_CHAR (xoff) out */
+ volatile unsigned char *uartp;
+ unsigned long flags;
+ uartp = (volatile unsigned char *) info->addr;
+ local_irq_save(flags);
+ info->imr |= MCFUART_UIR_TXREADY;
+ uartp[MCFUART_UIMR] = info->imr;
+ local_irq_restore(flags);
+ }
+#else
if (I_IXOFF(tty))
info->x_char = STOP_CHAR(tty);
+#endif
/* Turn off RTS line (do this atomic) */
}
@@ -907,8 +990,22 @@ static void mcfrs_unthrottle(struct tty_
if (I_IXOFF(tty)) {
if (info->x_char)
info->x_char = 0;
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ else {
+ /* Force START_CHAR (xon) out */
+ volatile unsigned char *uartp;
+ unsigned long flags;
+ info->x_char = START_CHAR(tty);
+ uartp = (volatile unsigned char *) info->addr;
+ local_irq_save(flags);
+ info->imr |= MCFUART_UIR_TXREADY;
+ uartp[MCFUART_UIMR] = info->imr;
+ local_irq_restore(flags);
+ }
+#else
else
info->x_char = START_CHAR(tty);
+#endif
}
/* Assert RTS line (do this atomic) */
@@ -1156,12 +1253,17 @@ static int mcfrs_ioctl(struct tty_struct
static void mcfrs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ int i = 0; /* hush GCC */
+#endif
if (tty->termios->c_cflag == old_termios->c_cflag)
return;
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ while (i++ < 35000) udelay(1);
+#endif
mcfrs_change_speed(info);
-
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
--- a/net/irda/irlap.c
+++ b/net/irda/irlap.c
@@ -627,7 +627,7 @@ void irlap_status_indication(struct irla
{
switch (quality_of_link) {
case STATUS_NO_ACTIVITY:
- IRDA_MESSAGE("IrLAP, no activity on link!\n");
+ /* IRDA_MESSAGE("IrLAP, no activity on link!\n"); */
break;
case STATUS_NOISY:
IRDA_MESSAGE("IrLAP, noisy link!\n");
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