File: [local] / sys / arch / jornada / stand / boot / ns16550.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:09:00 2008 UTC (16 years, 3 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
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/* $OpenBSD: ns16550.c,v 1.2 2006/07/29 15:01:49 kettenis Exp $ */
/* $NetBSD: ns16550.c,v 1.3 2005/12/24 20:07:03 perry Exp $ */
/*
* 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 console I/O routines for boards that use
* 16550-compatible UARTs.
*/
#include <sys/types.h>
#include <dev/cons.h>
#include <dev/ic/comreg.h>
#include "libsa.h"
#define INB(x) *((volatile uint8_t *) (CONADDR + (x)))
#define OUTB(x, v) *((volatile uint8_t *) (CONADDR + (x))) = (v)
#define ISSET(t,f) ((t) & (f))
#ifndef NS16550_FREQ
#define NS16550_FREQ COM_FREQ
#endif
static int
comspeed(int speed)
{
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
int x, err;
if (speed <= 0)
return (-1);
x = divrnd((NS16550_FREQ / 16), speed);
if (x <= 0)
return (-1);
err = divrnd((((quad_t)NS16550_FREQ) / 16) * 1000, speed * x) - 1000;
if (err < 0)
err = -err;
if (err > COM_TOLERANCE)
return (-1);
return (x);
#undef divrnd
}
void
com_probe(struct consdev *cn)
{
cn->cn_pri = CN_NORMAL;
cn->cn_dev = makedev(12, 0);
}
void
com_init(struct consdev *cn)
{
int rate;
OUTB(com_cfcr, LCR_DLAB);
rate = comspeed(CONSPEED);
OUTB(com_dlbl, rate);
OUTB(com_dlbh, rate >> 8);
OUTB(com_cfcr, LCR_8BITS);
OUTB(com_mcr, MCR_DTR | MCR_RTS);
OUTB(com_fifo,
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
OUTB(com_ier, 0);
}
int
com_getc(dev_t dev)
{
uint8_t stat;
if (dev & 0x80)
return ISSET(stat = INB(com_lsr), LSR_RXRDY);
while (!ISSET(stat = INB(com_lsr), LSR_RXRDY))
/* spin */ ;
return (INB(com_data));
}
void
com_putc(dev_t dev, int c)
{
uint8_t stat;
int timo;
/* Wait for any pending transmission to finish. */
timo = 50000;
while (!ISSET(stat = INB(com_lsr), LSR_TXRDY) && --timo)
/* spin */ ;
OUTB(com_data, c);
/* Wait for this transmission to complete. */
timo = 1500000;
while (!ISSET(stat = INB(com_lsr), LSR_TXRDY) && --timo)
/* spin */ ;
/* Clear any interrupts generated by this transmission. */
(void) INB(com_iir);
}