mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-16 05:50:19 +00:00
imx: serial: add IrDA support to serial driver
Using the iMX serial driver with an IrDA device needs extra peripheral settings and specific timing depending on the transmitter circuitry used. Signed-off-by: Fabian Godehardt <fg@emlix.com> Signed-off-by: Oskar Schirmer <os@emlix.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Fabian Godehardt
Linus Torvalds
parent
534fca068e
commit
b6e4913834
@ -20,11 +20,16 @@
|
||||
#define ASMARM_ARCH_UART_H
|
||||
|
||||
#define IMXUART_HAVE_RTSCTS (1<<0)
|
||||
#define IMXUART_IRDA (1<<1)
|
||||
|
||||
struct imxuart_platform_data {
|
||||
int (*init)(struct platform_device *pdev);
|
||||
int (*exit)(struct platform_device *pdev);
|
||||
unsigned int flags;
|
||||
void (*irda_enable)(int enable);
|
||||
unsigned int irda_inv_rx:1;
|
||||
unsigned int irda_inv_tx:1;
|
||||
unsigned short transceiver_delay;
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
@ -8,6 +8,9 @@
|
||||
* Author: Sascha Hauer <sascha@saschahauer.de>
|
||||
* Copyright (C) 2004 Pengutronix
|
||||
*
|
||||
* Copyright (C) 2009 emlix GmbH
|
||||
* Author: Fabian Godehardt (added IrDA support for iMX)
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
@ -41,6 +44,7 @@
|
||||
#include <linux/serial_core.h>
|
||||
#include <linux/serial.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/rational.h>
|
||||
|
||||
#include <asm/io.h>
|
||||
@ -149,6 +153,7 @@
|
||||
#define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */
|
||||
#define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */
|
||||
#define UFCR_RFDIV (7<<7) /* Reference freq divider mask */
|
||||
#define UFCR_RFDIV_REG(x) (((x) < 7 ? 6 - (x) : 6) << 7)
|
||||
#define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */
|
||||
#define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */
|
||||
#define USR1_RTSS (1<<14) /* RTS pin status */
|
||||
@ -213,9 +218,19 @@ struct imx_port {
|
||||
unsigned int old_status;
|
||||
int txirq,rxirq,rtsirq;
|
||||
unsigned int have_rtscts:1;
|
||||
unsigned int use_irda:1;
|
||||
unsigned int irda_inv_rx:1;
|
||||
unsigned int irda_inv_tx:1;
|
||||
unsigned short trcv_delay; /* transceiver delay */
|
||||
struct clk *clk;
|
||||
};
|
||||
|
||||
#ifdef CONFIG_IRDA
|
||||
#define USE_IRDA(sport) ((sport)->use_irda)
|
||||
#else
|
||||
#define USE_IRDA(sport) (0)
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Handle any change of modem status signal since we were last called.
|
||||
*/
|
||||
@ -269,6 +284,48 @@ static void imx_stop_tx(struct uart_port *port)
|
||||
struct imx_port *sport = (struct imx_port *)port;
|
||||
unsigned long temp;
|
||||
|
||||
if (USE_IRDA(sport)) {
|
||||
/* half duplex - wait for end of transmission */
|
||||
int n = 256;
|
||||
while ((--n > 0) &&
|
||||
!(readl(sport->port.membase + USR2) & USR2_TXDC)) {
|
||||
udelay(5);
|
||||
barrier();
|
||||
}
|
||||
/*
|
||||
* irda transceiver - wait a bit more to avoid
|
||||
* cutoff, hardware dependent
|
||||
*/
|
||||
udelay(sport->trcv_delay);
|
||||
|
||||
/*
|
||||
* half duplex - reactivate receive mode,
|
||||
* flush receive pipe echo crap
|
||||
*/
|
||||
if (readl(sport->port.membase + USR2) & USR2_TXDC) {
|
||||
temp = readl(sport->port.membase + UCR1);
|
||||
temp &= ~(UCR1_TXMPTYEN | UCR1_TRDYEN);
|
||||
writel(temp, sport->port.membase + UCR1);
|
||||
|
||||
temp = readl(sport->port.membase + UCR4);
|
||||
temp &= ~(UCR4_TCEN);
|
||||
writel(temp, sport->port.membase + UCR4);
|
||||
|
||||
while (readl(sport->port.membase + URXD0) &
|
||||
URXD_CHARRDY)
|
||||
barrier();
|
||||
|
||||
temp = readl(sport->port.membase + UCR1);
|
||||
temp |= UCR1_RRDYEN;
|
||||
writel(temp, sport->port.membase + UCR1);
|
||||
|
||||
temp = readl(sport->port.membase + UCR4);
|
||||
temp |= UCR4_DREN;
|
||||
writel(temp, sport->port.membase + UCR4);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
temp = readl(sport->port.membase + UCR1);
|
||||
writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1);
|
||||
}
|
||||
@ -324,9 +381,30 @@ static void imx_start_tx(struct uart_port *port)
|
||||
struct imx_port *sport = (struct imx_port *)port;
|
||||
unsigned long temp;
|
||||
|
||||
if (USE_IRDA(sport)) {
|
||||
/* half duplex in IrDA mode; have to disable receive mode */
|
||||
temp = readl(sport->port.membase + UCR4);
|
||||
temp &= ~(UCR4_DREN);
|
||||
writel(temp, sport->port.membase + UCR4);
|
||||
|
||||
temp = readl(sport->port.membase + UCR1);
|
||||
temp &= ~(UCR1_RRDYEN);
|
||||
writel(temp, sport->port.membase + UCR1);
|
||||
}
|
||||
|
||||
temp = readl(sport->port.membase + UCR1);
|
||||
writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
|
||||
|
||||
if (USE_IRDA(sport)) {
|
||||
temp = readl(sport->port.membase + UCR1);
|
||||
temp |= UCR1_TRDYEN;
|
||||
writel(temp, sport->port.membase + UCR1);
|
||||
|
||||
temp = readl(sport->port.membase + UCR4);
|
||||
temp |= UCR4_TCEN;
|
||||
writel(temp, sport->port.membase + UCR4);
|
||||
}
|
||||
|
||||
if (readl(sport->port.membase + UTS) & UTS_TXEMPTY)
|
||||
imx_transmit_buffer(sport);
|
||||
}
|
||||
@ -536,12 +614,7 @@ static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
|
||||
if(!ufcr_rfdiv)
|
||||
ufcr_rfdiv = 1;
|
||||
|
||||
if(ufcr_rfdiv >= 7)
|
||||
ufcr_rfdiv = 6;
|
||||
else
|
||||
ufcr_rfdiv = 6 - ufcr_rfdiv;
|
||||
|
||||
val |= UFCR_RFDIV & (ufcr_rfdiv << 7);
|
||||
val |= UFCR_RFDIV_REG(ufcr_rfdiv);
|
||||
|
||||
writel(val, sport->port.membase + UFCR);
|
||||
|
||||
@ -560,8 +633,24 @@ static int imx_startup(struct uart_port *port)
|
||||
* requesting IRQs
|
||||
*/
|
||||
temp = readl(sport->port.membase + UCR4);
|
||||
|
||||
if (USE_IRDA(sport))
|
||||
temp |= UCR4_IRSC;
|
||||
|
||||
writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
|
||||
|
||||
if (USE_IRDA(sport)) {
|
||||
/* reset fifo's and state machines */
|
||||
int i = 100;
|
||||
temp = readl(sport->port.membase + UCR2);
|
||||
temp &= ~UCR2_SRST;
|
||||
writel(temp, sport->port.membase + UCR2);
|
||||
while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) &&
|
||||
(--i > 0)) {
|
||||
udelay(1);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Allocate the IRQ(s) i.MX1 has three interrupts whereas later
|
||||
* chips only have one interrupt.
|
||||
@ -577,12 +666,16 @@ static int imx_startup(struct uart_port *port)
|
||||
if (retval)
|
||||
goto error_out2;
|
||||
|
||||
retval = request_irq(sport->rtsirq, imx_rtsint,
|
||||
(sport->rtsirq < MAX_INTERNAL_IRQ) ? 0 :
|
||||
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
|
||||
DRIVER_NAME, sport);
|
||||
if (retval)
|
||||
goto error_out3;
|
||||
/* do not use RTS IRQ on IrDA */
|
||||
if (!USE_IRDA(sport)) {
|
||||
retval = request_irq(sport->rtsirq, imx_rtsint,
|
||||
(sport->rtsirq < MAX_INTERNAL_IRQ) ? 0 :
|
||||
IRQF_TRIGGER_FALLING |
|
||||
IRQF_TRIGGER_RISING,
|
||||
DRIVER_NAME, sport);
|
||||
if (retval)
|
||||
goto error_out3;
|
||||
}
|
||||
} else {
|
||||
retval = request_irq(sport->port.irq, imx_int, 0,
|
||||
DRIVER_NAME, sport);
|
||||
@ -599,18 +692,49 @@ static int imx_startup(struct uart_port *port)
|
||||
|
||||
temp = readl(sport->port.membase + UCR1);
|
||||
temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN;
|
||||
|
||||
if (USE_IRDA(sport)) {
|
||||
temp |= UCR1_IREN;
|
||||
temp &= ~(UCR1_RTSDEN);
|
||||
}
|
||||
|
||||
writel(temp, sport->port.membase + UCR1);
|
||||
|
||||
temp = readl(sport->port.membase + UCR2);
|
||||
temp |= (UCR2_RXEN | UCR2_TXEN);
|
||||
writel(temp, sport->port.membase + UCR2);
|
||||
|
||||
if (USE_IRDA(sport)) {
|
||||
/* clear RX-FIFO */
|
||||
int i = 64;
|
||||
while ((--i > 0) &&
|
||||
(readl(sport->port.membase + URXD0) & URXD_CHARRDY)) {
|
||||
barrier();
|
||||
}
|
||||
}
|
||||
|
||||
#if defined CONFIG_ARCH_MX2 || defined CONFIG_ARCH_MX3
|
||||
temp = readl(sport->port.membase + UCR3);
|
||||
temp |= UCR3_RXDMUXSEL;
|
||||
writel(temp, sport->port.membase + UCR3);
|
||||
#endif
|
||||
|
||||
if (USE_IRDA(sport)) {
|
||||
temp = readl(sport->port.membase + UCR4);
|
||||
if (sport->irda_inv_rx)
|
||||
temp |= UCR4_INVR;
|
||||
else
|
||||
temp &= ~(UCR4_INVR);
|
||||
writel(temp | UCR4_DREN, sport->port.membase + UCR4);
|
||||
|
||||
temp = readl(sport->port.membase + UCR3);
|
||||
if (sport->irda_inv_tx)
|
||||
temp |= UCR3_INVT;
|
||||
else
|
||||
temp &= ~(UCR3_INVT);
|
||||
writel(temp, sport->port.membase + UCR3);
|
||||
}
|
||||
|
||||
/*
|
||||
* Enable modem status interrupts
|
||||
*/
|
||||
@ -618,6 +742,16 @@ static int imx_startup(struct uart_port *port)
|
||||
imx_enable_ms(&sport->port);
|
||||
spin_unlock_irqrestore(&sport->port.lock,flags);
|
||||
|
||||
if (USE_IRDA(sport)) {
|
||||
struct imxuart_platform_data *pdata;
|
||||
pdata = sport->port.dev->platform_data;
|
||||
sport->irda_inv_rx = pdata->irda_inv_rx;
|
||||
sport->irda_inv_tx = pdata->irda_inv_tx;
|
||||
sport->trcv_delay = pdata->transceiver_delay;
|
||||
if (pdata->irda_enable)
|
||||
pdata->irda_enable(1);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
error_out3:
|
||||
@ -639,6 +773,13 @@ static void imx_shutdown(struct uart_port *port)
|
||||
temp &= ~(UCR2_TXEN);
|
||||
writel(temp, sport->port.membase + UCR2);
|
||||
|
||||
if (USE_IRDA(sport)) {
|
||||
struct imxuart_platform_data *pdata;
|
||||
pdata = sport->port.dev->platform_data;
|
||||
if (pdata->irda_enable)
|
||||
pdata->irda_enable(0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Stop our timer.
|
||||
*/
|
||||
@ -648,7 +789,8 @@ static void imx_shutdown(struct uart_port *port)
|
||||
* Free the interrupts
|
||||
*/
|
||||
if (sport->txirq > 0) {
|
||||
free_irq(sport->rtsirq, sport);
|
||||
if (!USE_IRDA(sport))
|
||||
free_irq(sport->rtsirq, sport);
|
||||
free_irq(sport->txirq, sport);
|
||||
free_irq(sport->rxirq, sport);
|
||||
} else
|
||||
@ -660,6 +802,9 @@ static void imx_shutdown(struct uart_port *port)
|
||||
|
||||
temp = readl(sport->port.membase + UCR1);
|
||||
temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
|
||||
if (USE_IRDA(sport))
|
||||
temp &= ~(UCR1_IREN);
|
||||
|
||||
writel(temp, sport->port.membase + UCR1);
|
||||
}
|
||||
|
||||
@ -768,11 +913,19 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
|
||||
sport->port.membase + UCR2);
|
||||
old_txrxen &= (UCR2_TXEN | UCR2_RXEN);
|
||||
|
||||
div = sport->port.uartclk / (baud * 16);
|
||||
if (div > 7)
|
||||
div = 7;
|
||||
if (!div)
|
||||
if (USE_IRDA(sport)) {
|
||||
/*
|
||||
* use maximum available submodule frequency to
|
||||
* avoid missing short pulses due to low sampling rate
|
||||
*/
|
||||
div = 1;
|
||||
} else {
|
||||
div = sport->port.uartclk / (baud * 16);
|
||||
if (div > 7)
|
||||
div = 7;
|
||||
if (!div)
|
||||
div = 1;
|
||||
}
|
||||
|
||||
rational_best_approximation(16 * div * baud, sport->port.uartclk,
|
||||
1 << 16, 1 << 16, &num, &denom);
|
||||
@ -781,8 +934,7 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
|
||||
denom -= 1;
|
||||
|
||||
ufcr = readl(sport->port.membase + UFCR);
|
||||
ufcr = (ufcr & (~UFCR_RFDIV)) |
|
||||
(div << 7);
|
||||
ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div);
|
||||
writel(ufcr, sport->port.membase + UFCR);
|
||||
|
||||
writel(num, sport->port.membase + UBIR);
|
||||
@ -1141,6 +1293,11 @@ static int serial_imx_probe(struct platform_device *pdev)
|
||||
if (pdata && (pdata->flags & IMXUART_HAVE_RTSCTS))
|
||||
sport->have_rtscts = 1;
|
||||
|
||||
#ifdef CONFIG_IRDA
|
||||
if (pdata && (pdata->flags & IMXUART_IRDA))
|
||||
sport->use_irda = 1;
|
||||
#endif
|
||||
|
||||
if (pdata->init) {
|
||||
ret = pdata->init(pdev);
|
||||
if (ret)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user