u-boot/drivers/serial/serial_pxa.c

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/*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*
* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
*
* 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
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <common.h>
#include <watchdog.h>
#include <serial.h>
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#include <asm/arch/pxa-regs.h>
#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
#define FFUART_INDEX 0
#define BTUART_INDEX 1
#define STUART_INDEX 2
#ifndef CONFIG_SERIAL_MULTI
#if defined (CONFIG_FFUART)
#define UART_INDEX FFUART_INDEX
#elif defined (CONFIG_BTUART)
#define UART_INDEX BTUART_INDEX
#elif defined (CONFIG_STUART)
#define UART_INDEX STUART_INDEX
#else
#error "Bad: you didn't configure serial ..."
#endif
#endif
void pxa_setbrg_dev (unsigned int uart_index)
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{
unsigned int quot = 0;
if (gd->baudrate == 1200)
quot = 768;
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else if (gd->baudrate == 9600)
quot = 96;
else if (gd->baudrate == 19200)
quot = 48;
else if (gd->baudrate == 38400)
quot = 24;
else if (gd->baudrate == 57600)
quot = 16;
else if (gd->baudrate == 115200)
quot = 8;
else
hang ();
switch (uart_index) {
case FFUART_INDEX:
#ifdef CONFIG_CPU_MONAHANS
writel(readl(CKENA) | CKENA_22_FFUART, CKENA);
#else
writel(readl(CKEN) | CKEN6_FFUART, CKEN);
#endif /* CONFIG_CPU_MONAHANS */
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writel(0, FFIER); /* Disable for now */
writel(0, FFFCR); /* No fifos enabled */
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/* set baud rate */
writel(LCR_WLS0 | LCR_WLS1 | LCR_DLAB, FFLCR);
writel(quot & 0xff, FFDLL);
writel(quot >> 8, FFDLH);
writel(LCR_WLS0 | LCR_WLS1, FFLCR);
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writel(IER_UUE, FFIER); /* Enable FFUART */
break;
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case BTUART_INDEX:
#ifdef CONFIG_CPU_MONAHANS
writel(readl(CKENA) | CKENA_21_BTUART, CKENA);
#else
writel(readl(CKEN) | CKEN7_BTUART, CKEN);
#endif /* CONFIG_CPU_MONAHANS */
writel(0, BTIER);
writel(0, BTFCR);
/* set baud rate */
writel(LCR_DLAB, BTLCR);
writel(quot & 0xff, BTDLL);
writel(quot >> 8, BTDLH);
writel(LCR_WLS0 | LCR_WLS1, BTLCR);
writel(IER_UUE, BTIER); /* Enable BFUART */
break;
case STUART_INDEX:
#ifdef CONFIG_CPU_MONAHANS
writel(readl(CKENA) | CKENA_23_STUART, CKENA);
#else
writel(readl(CKEN) | CKEN5_STUART, CKEN);
#endif /* CONFIG_CPU_MONAHANS */
writel(0, STIER);
writel(0, STFCR);
/* set baud rate */
writel(LCR_DLAB, STLCR);
writel(quot & 0xff, STDLL);
writel(quot >> 8, STDLH);
writel(LCR_WLS0 | LCR_WLS1, STLCR);
writel(IER_UUE, STIER); /* Enable STUART */
break;
default:
hang();
}
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}
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*
*/
int pxa_init_dev (unsigned int uart_index)
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{
pxa_setbrg_dev (uart_index);
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return (0);
}
/*
* Output a single byte to the serial port.
*/
void pxa_putc_dev (unsigned int uart_index,const char c)
{
switch (uart_index) {
case FFUART_INDEX:
/* wait for room in the tx FIFO on FFUART */
while ((readl(FFLSR) & LSR_TEMT) == 0)
WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */
writel(c, FFTHR);
break;
case BTUART_INDEX:
while ((readl(BTLSR) & LSR_TEMT) == 0)
WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */
writel(c, BTTHR);
break;
case STUART_INDEX:
while ((readl(STLSR) & LSR_TEMT) == 0)
WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */
writel(c, STTHR);
break;
}
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/* If \n, also do \r */
if (c == '\n')
pxa_putc_dev (uart_index,'\r');
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}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
int pxa_tstc_dev (unsigned int uart_index)
{
switch (uart_index) {
case FFUART_INDEX:
return readl(FFLSR) & LSR_DR;
case BTUART_INDEX:
return readl(BTLSR) & LSR_DR;
case STUART_INDEX:
return readl(STLSR) & LSR_DR;
}
return -1;
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}
/*
* Read a single byte from the serial port. Returns 1 on success, 0
* otherwise. When the function is succesfull, the character read is
* written into its argument c.
*/
int pxa_getc_dev (unsigned int uart_index)
{
switch (uart_index) {
case FFUART_INDEX:
while (!(readl(FFLSR) & LSR_DR))
/* Reset HW Watchdog, if needed */
WATCHDOG_RESET();
return (char) readl(FFRBR) & 0xff;
case BTUART_INDEX:
while (!(readl(BTLSR) & LSR_DR))
/* Reset HW Watchdog, if needed */
WATCHDOG_RESET();
return (char) readl(BTRBR) & 0xff;
case STUART_INDEX:
while (!(readl(STLSR) & LSR_DR))
/* Reset HW Watchdog, if needed */
WATCHDOG_RESET();
return (char) readl(STRBR) & 0xff;
}
return -1;
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}
void
pxa_puts_dev (unsigned int uart_index,const char *s)
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{
while (*s) {
pxa_putc_dev (uart_index,*s++);
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}
}
#if defined (CONFIG_FFUART)
static int ffuart_init(void)
{
return pxa_init_dev(FFUART_INDEX);
}
static void ffuart_setbrg(void)
{
return pxa_setbrg_dev(FFUART_INDEX);
}
static void ffuart_putc(const char c)
{
return pxa_putc_dev(FFUART_INDEX,c);
}
static void ffuart_puts(const char *s)
{
return pxa_puts_dev(FFUART_INDEX,s);
}
static int ffuart_getc(void)
{
return pxa_getc_dev(FFUART_INDEX);
}
static int ffuart_tstc(void)
{
return pxa_tstc_dev(FFUART_INDEX);
}
struct serial_device serial_ffuart_device =
{
"serial_ffuart",
ffuart_init,
NULL,
ffuart_setbrg,
ffuart_getc,
ffuart_tstc,
ffuart_putc,
ffuart_puts,
};
#endif
#if defined (CONFIG_BTUART)
static int btuart_init(void)
{
return pxa_init_dev(BTUART_INDEX);
}
static void btuart_setbrg(void)
{
return pxa_setbrg_dev(BTUART_INDEX);
}
static void btuart_putc(const char c)
{
return pxa_putc_dev(BTUART_INDEX,c);
}
static void btuart_puts(const char *s)
{
return pxa_puts_dev(BTUART_INDEX,s);
}
static int btuart_getc(void)
{
return pxa_getc_dev(BTUART_INDEX);
}
static int btuart_tstc(void)
{
return pxa_tstc_dev(BTUART_INDEX);
}
struct serial_device serial_btuart_device =
{
"serial_btuart",
btuart_init,
NULL,
btuart_setbrg,
btuart_getc,
btuart_tstc,
btuart_putc,
btuart_puts,
};
#endif
#if defined (CONFIG_STUART)
static int stuart_init(void)
{
return pxa_init_dev(STUART_INDEX);
}
static void stuart_setbrg(void)
{
return pxa_setbrg_dev(STUART_INDEX);
}
static void stuart_putc(const char c)
{
return pxa_putc_dev(STUART_INDEX,c);
}
static void stuart_puts(const char *s)
{
return pxa_puts_dev(STUART_INDEX,s);
}
static int stuart_getc(void)
{
return pxa_getc_dev(STUART_INDEX);
}
static int stuart_tstc(void)
{
return pxa_tstc_dev(STUART_INDEX);
}
struct serial_device serial_stuart_device =
{
"serial_stuart",
stuart_init,
NULL,
stuart_setbrg,
stuart_getc,
stuart_tstc,
stuart_putc,
stuart_puts,
};
#endif
#ifndef CONFIG_SERIAL_MULTI
inline int serial_init(void) {
return (pxa_init_dev(UART_INDEX));
}
void serial_setbrg(void) {
pxa_setbrg_dev(UART_INDEX);
}
int serial_getc(void) {
return(pxa_getc_dev(UART_INDEX));
}
int serial_tstc(void) {
return(pxa_tstc_dev(UART_INDEX));
}
void serial_putc(const char c) {
pxa_putc_dev(UART_INDEX,c);
}
void serial_puts(const char *s) {
pxa_puts_dev(UART_INDEX,s);
}
#endif /* CONFIG_SERIAL_MULTI */