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