From 5c37079957c5e5555aa8284a879f8cc44fa8eb25 Mon Sep 17 00:00:00 2001
From: Alison Wang <b18965@freescale.com>
Date: Thu, 4 Aug 2011 09:59:39 +0800
Subject: [PATCH 05/52] Add serial driver and irda driver support for MCF5445x and MCF547x/MCF548x
Add common serial driver for MCF5445x and MCF547x/MCF548x.
Also add irda support for MCF547x/MCF548x.
Signed-off-by: Alison Wang <b18965@freescale.com>
---
drivers/tty/serial/Kconfig | 20 ++++++++++
drivers/tty/serial/mcf.c | 87 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 107 insertions(+), 0 deletions(-)
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1027,6 +1027,26 @@ config SERIAL_68328_RTS_CTS
bool "Support RTS/CTS on 68328 serial port"
depends on SERIAL_68328
+config SERIAL_COLDFIRE_IRDA
+ bool "ColdFire IRDA support"
+ depends on SERIAL_MCF
+ help
+ This driver supports IrDA on the ColdFire platform,
+ such as MCF547x and MCF548x.
+
+ Say Y here if you want to use IrDA 1.1 SIR mode.
+
+config SERIAL_COLDFIRE_EDMA
+ bool "ColdFire serial EDMA support"
+ depends on SERIAL_MCF
+ default n
+ help
+ Enables Enhanced Direct Memory Access(eDMA) in the Coldfire
+ serial driver.
+
+ Say Y here if you want to use DMA processing of transmit
+ and receive data for the serial driver.
+
config SERIAL_MCF
bool "Coldfire serial support"
depends on COLDFIRE
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -4,6 +4,10 @@
* mcf.c -- Freescale ColdFire UART driver
*
* (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
+ * Copyright (C) 2008-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Jason Jin Jason.Jin@freescale.com
+ * Shrek Wu B16972@freescale.com
+ * Chengju Cai b22600@freescale.com
*
* 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
@@ -23,9 +27,11 @@
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/io.h>
+#include <linux/delay.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/mcfuart.h>
+#include <asm/m5485psc.h>
#include <asm/nettel.h>
/****************************************************************************/
@@ -46,6 +52,10 @@
#define mcf_setppdtr(p, v) do { } while (0)
#endif
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+#define SERIAL_IRDA_LINE (2)
+#endif
+
/****************************************************************************/
/*
@@ -101,6 +111,15 @@ static void mcf_start_tx(struct uart_por
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ if (port->line == SERIAL_IRDA_LINE) {
+ /* Disable IRDA receiver*/
+ writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
+ writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
+
+ writeb(MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR);
+ }
+#endif
pp->imr |= MCFUART_UIR_TXREADY;
writeb(pp->imr, port->membase + MCFUART_UIMR);
}
@@ -154,6 +173,30 @@ static int mcf_startup(struct uart_port
spin_lock_irqsave(&port->lock, flags);
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ if (port->line == SERIAL_IRDA_LINE) {
+ /* Put PSC in IrDA mode */
+ MCF_PSC_SICR(port->line) = MCF_PSC_SICR_SIM_SIR;
+
+ /* Set pulse width to 1.6 uS */
+ MCF_PSC_IRSDR(port->line) = (uint8_t)
+ (16 * (CONFIG_MCFCLK / 10000000));
+ MCF_PSC_IRCR1(port->line) = MCF_PSC_IRCR1_SPUL;
+ MCF_PSC_IRCR2(port->line) = 0;
+
+ /* Enable RTS to send */
+ MCF_PSC_OPSET(port->line) = MCF_PSC_OPSET_RTS;
+
+ /* Setup FIFO Alarms */
+ MCF_PSC_RFAR(port->line) = MCF_PSC_RFAR_ALARM(248);
+ MCF_PSC_TFAR(port->line) = MCF_PSC_TFAR_ALARM(248);
+
+ MCF_PSC_RFCR(port->line) = MCF_PSC_RFCR_FRMEN
+ | MCF_PSC_RFCR_GR(4);
+ MCF_PSC_TFCR(port->line) = MCF_PSC_TFCR_FRMEN
+ | MCF_PSC_RFCR_GR(4);
+ }
+#endif
/* Reset UART, get it into known state... */
writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
@@ -177,7 +220,17 @@ static void mcf_shutdown(struct uart_por
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned long flags;
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ unsigned long delay_counter = 0;
+#endif
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ while (!((readb(port->membase + MCFUART_USR)) & MCFUART_USR_TXEMPTY)) {
+ if (delay_counter++ > 25000)
+ break;
+ udelay(10);
+ }
+#endif
spin_lock_irqsave(&port->lock, flags);
/* Disable all interrupts now */
@@ -202,7 +255,14 @@ static void mcf_set_termios(struct uart_
unsigned int baudfr;
#endif
unsigned char mr1, mr2;
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ int i = 0; /* hush GCC */
+#endif
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ while (i++ < 35000)
+ udelay(1);
+#endif
baud = uart_get_baud_rate(port, termios, old, 0, 230400);
#if defined(CONFIG_M5272)
baudclk = (MCF_BUSCLK / baud) / 32;
@@ -331,6 +391,23 @@ static void mcf_tx_chars(struct mcf_uart
while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
if (xmit->head == xmit->tail)
break;
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ if (port->line == SERIAL_IRDA_LINE) {
+ while (!((readb(port->membase + MCFUART_USR))\
+ & MCFUART_USR_TXEMPTY))
+ ;
+ /* delay for settle */
+#if defined(CONFIG_M548X)
+ udelay(1);
+#elif defined(CONFIG_M547X)
+ udelay(2);
+#else
+ int i = 0;
+ while (i++ < 25000)
+ udelay(1);
+#endif
+ }
+#endif
writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
port->icount.tx++;
@@ -340,6 +417,16 @@ static void mcf_tx_chars(struct mcf_uart
uart_write_wakeup(port);
if (xmit->head == xmit->tail) {
+#ifdef CONFIG_SERIAL_COLDFIRE_IRDA
+ if (port->line == SERIAL_IRDA_LINE) {
+ /* Enable receiver for IRDA */
+ writeb(MCFUART_UCR_CMDRESETRX,\
+ port->membase + MCFUART_UCR);
+ /* reset RX */
+ writeb(MCFUART_UCR_TXENABLE | MCFUART_UCR_RXENABLE,\
+ port->membase + MCFUART_UCR);
+ }
+#endif
pp->imr &= ~MCFUART_UIR_TXREADY;
writeb(pp->imr, port->membase + MCFUART_UIMR);
}