NetBSD-5.0.2/sys/arch/evbarm/stand/board/sscom.c
/* $NetBSD: sscom.c,v 1.5 2005/12/24 20:07:03 perry Exp $ */
/*
* Copyright (c) 2002, 2003 Fujitsu Component Limited
* Copyright (c) 2002, 2003 Genetec Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of The Fujitsu Component Limited nor the name of
* Genetec corporation may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC
* CORPORATION ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL FUJITSU COMPONENT LIMITED OR GENETEC
* CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* derived from ns16550.c */
/*
* Copyright (c) 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file provides the cons_init() function and console I/O routines
* for boards that use built-in UART of Samsung's S3C2xx0 CPUs.
*/
#include <sys/types.h>
#include <arch/arm/s3c2xx0/s3c2xx0reg.h>
#ifdef CPU_S3C2410
#include <arch/arm/s3c2xx0/s3c2410reg.h>
#endif
#ifdef CPU_S3C2800
#include <arch/arm/s3c2xx0/s3c2800reg.h>
#endif
#include <lib/libsa/stand.h>
#include "board.h"
#ifndef SSCOM_TOLERANCE
#define SSCOM_TOLERANCE 30 /* XXX: baud rate tolerance, in 0.1% units */
#endif
#define INB(x) *((volatile uint8_t *) ((CONADDR) + (x)))
#define INW(x) *((volatile uint32_t *) ((CONADDR) + (x)))
#define OUTB(x, v) (*((volatile uint8_t *) ((CONADDR) + (x))) = (v))
#define OUTW(x, v) (*((volatile uint32_t *) ((CONADDR) + (x))) = (v))
#define ISSET(t,f) ((t) & (f))
static long get_com_freq(void);
static int
sscomspeed(long speed)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
long pclk = get_com_freq();
if (speed <= 0)
return -1;
x = divrnd(pclk / 16, speed);
if (x <= 0)
return -1;
err = divrnd(((quad_t)pclk) * 1000 / 16, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > SSCOM_TOLERANCE)
return -1;
return x-1;
#undef divrnd
}
void
cons_init(void)
{
int rate;
OUTW(SSCOM_UCON, 0);
OUTB(SSCOM_UFCON, UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 |
UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET |
UFCON_FIFO_ENABLE);
rate = sscomspeed(CONSPEED);
OUTW(SSCOM_UBRDIV, rate);
OUTW(SSCOM_ULCON, ULCON_PARITY_NONE|ULCON_LENGTH_8);
/* enable UART */
OUTW(SSCOM_UCON, UCON_TXMODE_INT|UCON_RXMODE_INT);
OUTW(SSCOM_UMCON, UMCON_RTS);
}
#define sscom_rxrdy() (INB(SSCOM_UTRSTAT) & UTRSTAT_RXREADY)
int
getchar(void)
{
uint8_t stat;
int c;
while (!sscom_rxrdy())
/* spin */ ;
c = INB(SSCOM_URXH);
stat = INB(SSCOM_UERSTAT); /* XXX */
return c;
}
static void
iputchar(int c)
{
uint32_t stat;
int timo;
/* Wait for any pending transmission to finish. */
timo = 50000;
while (ISSET(stat = INW(SSCOM_UFSTAT), UFSTAT_TXFULL) && --timo)
/* spin */ ;
OUTB(SSCOM_UTXH, c);
#if 0
/* Wait for this transmission to complete. */
timo = 1500000;
while (!ISSET(stat = INW(SSCOM_UFSTAT), UFSTAT_TXFULL) && --timo)
/* spin */ ;
#endif
}
void
putchar(int c)
{
if (c == '\n')
iputchar('\r');
iputchar(c);
}
#define read_reg(addr) (*(volatile uint32_t *)(addr))
static long
get_com_freq(void)
{
long clk;
#ifdef CPU_S3C2800
uint32_t pllcon = read_reg(S3C2800_CLKMAN_BASE+CLKMAN_PLLCON);
uint32_t div = read_reg(S3C2800_CLKMAN_BASE+CLKMAN_CLKCON);
#define HDIV CLKCON_HCLK
#define PDIV CLKCON_PCLK
#endif
#ifdef CPU_S3C2410
uint32_t pllcon = read_reg(S3C2410_CLKMAN_BASE+CLKMAN_MPLLCON);
uint32_t div = read_reg(S3C2410_CLKMAN_BASE+CLKMAN_CLKDIVN);
#define HDIV CLKDIVN_HDIVN
#define PDIV CLKDIVN_PDIVN
#endif
int mdiv = (pllcon & PLLCON_MDIV_MASK) >> PLLCON_MDIV_SHIFT;
int pdiv = (pllcon & PLLCON_PDIV_MASK) >> PLLCON_PDIV_SHIFT;
int sdiv = (pllcon & PLLCON_SDIV_MASK) >> PLLCON_SDIV_SHIFT;
#if XTAL_CLK < 1000 /* in MHz */
clk = (XTAL_CLK * 1000000 * (8 + mdiv)) / ((pdiv + 2) << sdiv);
#else /* in Hz */
clk = (XTAL_CLK * (8 + mdiv)) / ((pdiv + 2) << sdiv);
#endif
/*printf( "M=%d P=%d S=%d\n", mdiv, pdiv, sdiv);*/
if (div & HDIV)
clk /= 2;
if (div & PDIV)
clk /= 2;
return clk;
}