serial.c.svn-base

u-boot for S3c2443 processor

/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 */
/*------------------------------------------------------------------------------+ */
/*
 * This source code has been made available to you by IBM on an AS-IS
 * basis.  Anyone receiving this source is licensed under IBM
 * copyrights to use it in any way he or she deems fit, including
 * copying it, modifying it, compiling it, and redistributing it either
 * with or without modifications.  No license under IBM patents or
 * patent applications is to be implied by the copyright license.
 *
 * Any user of this software should understand that IBM cannot provide
 * technical support for this software and will not be responsible for
 * any consequences resulting from the use of this software.
 *
 * Any person who transfers this source code or any derivative work
 * must include the IBM copyright notice, this paragraph, and the
 * preceding two paragraphs in the transferred software.
 *
 * COPYRIGHT   I B M   CORPORATION 1995
 * LICENSED MATERIAL  -  PROGRAM PROPERTY OF I B M
 */
/*------------------------------------------------------------------------------- */

#include <common.h>
#include <commproc.h>
#include <asm/processor.h>
#include <watchdog.h>
#include "vecnum.h"

#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
#include <malloc.h>
#endif

/*****************************************************************************/
#ifdef CONFIG_IOP480

#define SPU_BASE         0x40000000

#define spu_LineStat_rc  0x00	/* Line Status Register (Read/Clear) */
#define spu_LineStat_w   0x04	/* Line Status Register (Set) */
#define spu_Handshk_rc   0x08	/* Handshake Status Register (Read/Clear) */
#define spu_Handshk_w    0x0c	/* Handshake Status Register (Set) */
#define spu_BRateDivh    0x10	/* Baud rate divisor high */
#define spu_BRateDivl    0x14	/* Baud rate divisor low */
#define spu_CtlReg       0x18	/* Control Register */
#define spu_RxCmd        0x1c	/* Rx Command Register */
#define spu_TxCmd        0x20	/* Tx Command Register */
#define spu_RxBuff       0x24	/* Rx data buffer */
#define spu_TxBuff       0x24	/* Tx data buffer */

/*-----------------------------------------------------------------------------+
  | Line Status Register.
  +-----------------------------------------------------------------------------*/
#define asyncLSRport1           0x40000000
#define asyncLSRport1set        0x40000004
#define asyncLSRDataReady             0x80
#define asyncLSRFramingError          0x40
#define asyncLSROverrunError          0x20
#define asyncLSRParityError           0x10
#define asyncLSRBreakInterrupt        0x08
#define asyncLSRTxHoldEmpty           0x04
#define asyncLSRTxShiftEmpty          0x02

/*-----------------------------------------------------------------------------+
  | Handshake Status Register.
  +-----------------------------------------------------------------------------*/
#define asyncHSRport1           0x40000008
#define asyncHSRport1set        0x4000000c
#define asyncHSRDsr                   0x80
#define asyncLSRCts                   0x40

/*-----------------------------------------------------------------------------+
  | Control Register.
  +-----------------------------------------------------------------------------*/
#define asyncCRport1            0x40000018
#define asyncCRNormal                 0x00
#define asyncCRLoopback               0x40
#define asyncCRAutoEcho               0x80
#define asyncCRDtr                    0x20
#define asyncCRRts                    0x10
#define asyncCRWordLength7            0x00
#define asyncCRWordLength8            0x08
#define asyncCRParityDisable          0x00
#define asyncCRParityEnable           0x04
#define asyncCREvenParity             0x00
#define asyncCROddParity              0x02
#define asyncCRStopBitsOne            0x00
#define asyncCRStopBitsTwo            0x01
#define asyncCRDisableDtrRts          0x00

/*-----------------------------------------------------------------------------+
  | Receiver Command Register.
  +-----------------------------------------------------------------------------*/
#define asyncRCRport1           0x4000001c
#define asyncRCRDisable               0x00
#define asyncRCREnable                0x80
#define asyncRCRIntDisable            0x00
#define asyncRCRIntEnabled            0x20
#define asyncRCRDMACh2                0x40
#define asyncRCRDMACh3                0x60
#define asyncRCRErrorInt              0x10
#define asyncRCRPauseEnable           0x08

/*-----------------------------------------------------------------------------+
  | Transmitter Command Register.
  +-----------------------------------------------------------------------------*/
#define asyncTCRport1           0x40000020
#define asyncTCRDisable               0x00
#define asyncTCREnable                0x80
#define asyncTCRIntDisable            0x00
#define asyncTCRIntEnabled            0x20
#define asyncTCRDMACh2                0x40
#define asyncTCRDMACh3                0x60
#define asyncTCRTxEmpty               0x10
#define asyncTCRErrorInt              0x08
#define asyncTCRStopPause             0x04
#define asyncTCRBreakGen              0x02

/*-----------------------------------------------------------------------------+
  | Miscellanies defines.
  +-----------------------------------------------------------------------------*/
#define asyncTxBufferport1      0x40000024
#define asyncRxBufferport1      0x40000024
#define asyncDLABLsbport1       0x40000014
#define asyncDLABMsbport1       0x40000010
#define asyncXOFFchar                 0x13
#define asyncXONchar                  0x11


/*
 * Minimal serial functions needed to use one of the SMC ports
 * as serial console interface.
 */

int serial_init (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	volatile char val;
	unsigned short br_reg;

	br_reg = ((((CONFIG_CPUCLOCK * 1000000) / 16) / gd->baudrate) - 1);

	/*
	 * Init onboard UART
	 */
	out8 (SPU_BASE + spu_LineStat_rc, 0x78); /* Clear all bits in Line Status Reg */
	out8 (SPU_BASE + spu_BRateDivl, (br_reg & 0x00ff)); /* Set baud rate divisor... */
	out8 (SPU_BASE + spu_BRateDivh, ((br_reg & 0xff00) >> 8)); /* ... */
	out8 (SPU_BASE + spu_CtlReg, 0x08);	/* Set 8 bits, no parity and 1 stop bit */
	out8 (SPU_BASE + spu_RxCmd, 0xb0);	/* Enable Rx */
	out8 (SPU_BASE + spu_TxCmd, 0x9c);	/* Enable Tx */
	out8 (SPU_BASE + spu_Handshk_rc, 0xff);	/* Clear Handshake */
	val = in8 (SPU_BASE + spu_RxBuff);	/* Dummy read, to clear receiver */

	return (0);
}


void serial_setbrg (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	unsigned short br_reg;

	br_reg = ((((CONFIG_CPUCLOCK * 1000000) / 16) / gd->baudrate) - 1);

	out8 (SPU_BASE + spu_BRateDivl, (br_reg & 0x00ff)); /* Set baud rate divisor... */
	out8 (SPU_BASE + spu_BRateDivh, ((br_reg & 0xff00) >> 8)); /* ... */
}


void serial_putc (const char c)
{
	if (c == '\n')
		serial_putc ('\r');

	/* load status from handshake register */
	if (in8 (SPU_BASE + spu_Handshk_rc) != 00)
		out8 (SPU_BASE + spu_Handshk_rc, 0xff);	/* Clear Handshake */

	out8 (SPU_BASE + spu_TxBuff, c);	/* Put char */

	while ((in8 (SPU_BASE + spu_LineStat_rc) & 04) != 04) {
		if (in8 (SPU_BASE + spu_Handshk_rc) != 00)
			out8 (SPU_BASE + spu_Handshk_rc, 0xff);	/* Clear Handshake */
	}
}


void serial_puts (const char *s)
{
	while (*s) {
		serial_putc (*s++);
	}
}


int serial_getc ()
{
	unsigned char status = 0;

	while (1) {
		status = in8 (asyncLSRport1);
		if ((status & asyncLSRDataReady) != 0x0) {
			break;
		}
		if ((status & ( asyncLSRFramingError |
				asyncLSROverrunError |
				asyncLSRParityError  |
				asyncLSRBreakInterrupt )) != 0) {
			(void) out8 (asyncLSRport1,
				     asyncLSRFramingError |
				     asyncLSROverrunError |
				     asyncLSRParityError  |
				     asyncLSRBreakInterrupt );
		}
	}
	return (0x000000ff & (int) in8 (asyncRxBufferport1));
}


int serial_tstc ()
{
	unsigned char status;

	status = in8 (asyncLSRport1);
	if ((status & asyncLSRDataReady) != 0x0) {
		return (1);
	}
	if ((status & ( asyncLSRFramingError |
			asyncLSROverrunError |
			asyncLSRParityError  |
			asyncLSRBreakInterrupt )) != 0) {
		(void) out8 (asyncLSRport1,
			     asyncLSRFramingError |
			     asyncLSROverrunError |
			     asyncLSRParityError  |
			     asyncLSRBreakInterrupt);
	}
	return 0;
}

#endif	/* CONFIG_IOP480 */


/*****************************************************************************/
#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_440) || defined(CONFIG_405EP)

#if defined(CONFIG_440)
#define UART0_BASE  CFG_PERIPHERAL_BASE + 0x00000200
#define UART1_BASE  CFG_PERIPHERAL_BASE + 0x00000300
#if defined(CONFIG_440_GX)
#define CR0_MASK        0xdfffffff
#define CR0_EXTCLK_ENA  0x00800000
#define CR0_UDIV_POS    0
#else
#define CR0_MASK        0x3fff0000
#define CR0_EXTCLK_ENA  0x00600000
#define CR0_UDIV_POS    16
#endif /* CONFIG_440_GX */
#elif defined(CONFIG_405EP)
#define UART0_BASE      0xef600300
#define UART1_BASE      0xef600400
#define UCR0_MASK       0x0000007f
#define UCR1_MASK       0x00007f00
#define UCR0_UDIV_POS   0
#define UCR1_UDIV_POS   8
#define UDIV_MAX        127
#else /* CONFIG_405GP || CONFIG_405CR */
#define UART0_BASE      0xef600300
#define UART1_BASE      0xef600400
#define CR0_MASK        0x00001fff
#define CR0_EXTCLK_ENA  0x000000c0
#define CR0_UDIV_POS    1
#define UDIV_MAX        32
#endif

/* using serial port 0 or 1 as U-Boot console ? */
#if defined(CONFIG_UART1_CONSOLE)
#define ACTING_UART0_BASE	UART1_BASE
#define ACTING_UART1_BASE	UART0_BASE
#if defined(CONFIG_440_GX)
#define UART0_SDR           sdr_uart1
#define UART1_SDR           sdr_uart0
#endif /* CONFIG_440_GX */
#else
#define ACTING_UART0_BASE	UART0_BASE
#define ACTING_UART1_BASE	UART1_BASE
#if defined(CONFIG_440_GX)
#define UART0_SDR           sdr_uart0
#define UART1_SDR           sdr_uart1
#endif /* CONFIG_440_GX */
#endif

#if defined(CONFIG_405EP) && defined(CFG_EXT_SERIAL_CLOCK)
#error "External serial clock not supported on IBM PPC405EP!"
#endif

#define UART_RBR    0x00
#define UART_THR    0x00
#define UART_IER    0x01
#define UART_IIR    0x02
#define UART_FCR    0x02
#define UART_LCR    0x03
#define UART_MCR    0x04
#define UART_LSR    0x05
#define UART_MSR    0x06
#define UART_SCR    0x07
#define UART_DLL    0x00
#define UART_DLM    0x01

/*-----------------------------------------------------------------------------+
  | Line Status Register.
  +-----------------------------------------------------------------------------*/
/*#define asyncLSRport1           ACTING_UART0_BASE+0x05 */
#define asyncLSRDataReady1            0x01
#define asyncLSROverrunError1         0x02
#define asyncLSRParityError1          0x04
#define asyncLSRFramingError1         0x08
#define asyncLSRBreakInterrupt1       0x10
#define asyncLSRTxHoldEmpty1          0x20
#define asyncLSRTxShiftEmpty1         0x40
#define asyncLSRRxFifoError1          0x80

/*-----------------------------------------------------------------------------+
  | Miscellanies defines.
  +-----------------------------------------------------------------------------*/
/*#define asyncTxBufferport1      ACTING_UART0_BASE+0x00 */
/*#define asyncRxBufferport1      ACTING_UART0_BASE+0x00 */


#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
/*-----------------------------------------------------------------------------+
  | Fifo
  +-----------------------------------------------------------------------------*/
typedef struct {
	char *rx_buffer;
	ulong rx_put;
	ulong rx_get;
} serial_buffer_t;

volatile static serial_buffer_t buf_info;
#endif


#if defined(CONFIG_440) && !defined(CFG_EXT_SERIAL_CLOCK)
static void serial_divs (int baudrate, unsigned long *pudiv,
			 unsigned short *pbdiv )
{
	sys_info_t	sysinfo;
	unsigned long div;		/* total divisor udiv * bdiv */
	unsigned long umin;		/* minimum udiv	*/
	unsigned short diff;    /* smallest diff */
	unsigned long udiv;     /* best udiv */

	unsigned short idiff;   /* current diff */
	unsigned short ibdiv;   /* current bdiv */
	unsigned long i;
	unsigned long est;      /* current estimate */

	get_sys_info( &sysinfo );

	udiv = 32;     /* Assume lowest possible serial clk */
	div = sysinfo.freqPLB/(16*baudrate); /* total divisor */
	umin = sysinfo.pllOpbDiv<<1; /* 2 x OPB divisor */
	diff = 32;      /* highest possible */

	/* i is the test udiv value -- start with the largest
	 * possible (32) to minimize serial clock and constrain
	 * search to umin.
	 */
	for( i = 32; i > umin; i-- ){
		ibdiv = div/i;
		est = i * ibdiv;
		idiff = (est > div) ? (est-div) : (div-est);
		if( idiff == 0 ){
			udiv = i;
			break;      /* can't do better */
		}
		else if( idiff < diff ){
			udiv = i;       /* best so far */
			diff = idiff;   /* update lowest diff*/
		}
	}

	*pudiv = udiv;
	*pbdiv = div/udiv;

}
#endif /* defined(CONFIG_440) && !defined(CFG_EXT_SERIAL_CLK */


/*
 * Minimal serial functions needed to use one of the SMC ports
 * as serial console interface.
 */

#if defined(CONFIG_440)
int serial_init (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	unsigned long reg;
	unsigned long udiv;
	unsigned short bdiv;
	volatile char val;
#ifdef CFG_EXT_SERIAL_CLOCK
	unsigned long tmp;
#endif

#if defined(CONFIG_440_GX)
	mfsdr(UART0_SDR,reg);
	reg &= ~CR0_MASK;
#else