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/*
* Copyright (c) 2003 Marcel Moolenaar
* Copyright (c) 2007-2009 Andrew Turner
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/s3c2xx0/uart_dev_s3c2410.c 205354 2010-03-20 03:39:35Z imp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/cons.h>
#include <sys/tty.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_cpu.h>
#include <dev/uart/uart_bus.h>
#include <arm/s3c2xx0/s3c2440reg.h>
#include <arm/s3c2xx0/uart_dev_s3c2410.h>
#include <arm/s3c2xx0/s3c2xx0reg.h>
#include <arm/s3c2xx0/s3c2xx0var.h>
#include "uart_if.h"
/* Finds the subirq from the parent */
#define get_sub_irq(parent, offset) \
((parent == S3C24X0_INT_UART0) ? S3C24X0_SUBIRQ_MIN + offset : \
((parent == S3C24X0_INT_UART1) ? S3C24X0_SUBIRQ_MIN + 3 + offset : \
S3C24X0_SUBIRQ_MIN + 6 + offset))
#define RX_OFF 0
#define TX_OFF 1
#define ERR_OFF 2
extern unsigned int s3c2410_pclk;
static int sscomspeed(long, long);
static int s3c24x0_uart_param(struct uart_bas *, int, int, int, int);
/*
* Low-level UART interface.
*/
static int s3c2410_probe(struct uart_bas *bas);
static void s3c2410_init(struct uart_bas *bas, int, int, int, int);
static void s3c2410_term(struct uart_bas *bas);
static void s3c2410_putc(struct uart_bas *bas, int);
static int s3c2410_rxready(struct uart_bas *bas);
static int s3c2410_getc(struct uart_bas *bas, struct mtx *mtx);
extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
static int
sscomspeed(long speed, long frequency)
{
int x;
if (speed <= 0 || frequency <= 0)
return -1;
x = (frequency / 16) / speed;
return x-1;
}
static int
s3c24x0_uart_param(struct uart_bas *bas, int baudrate, int databits,
int stopbits, int parity)
{
int brd, ulcon;
ulcon = 0;
switch(databits) {
case 5:
ulcon |= ULCON_LENGTH_5;
break;
case 6:
ulcon |= ULCON_LENGTH_6;
break;
case 7:
ulcon |= ULCON_LENGTH_7;
break;
case 8:
ulcon |= ULCON_LENGTH_8;
break;
default:
return (EINVAL);
}
switch (parity) {
case UART_PARITY_NONE:
ulcon |= ULCON_PARITY_NONE;
break;
case UART_PARITY_ODD:
ulcon |= ULCON_PARITY_ODD;
break;
case UART_PARITY_EVEN:
ulcon |= ULCON_PARITY_EVEN;
break;
case UART_PARITY_MARK:
case UART_PARITY_SPACE:
default:
return (EINVAL);
}
if (stopbits == 2)
ulcon |= ULCON_STOP;
uart_setreg(bas, SSCOM_ULCON, ulcon);
brd = sscomspeed(baudrate, bas->rclk);
uart_setreg(bas, SSCOM_UBRDIV, brd);
return (0);
}
struct uart_ops uart_s3c2410_ops = {
.probe = s3c2410_probe,
.init = s3c2410_init,
.term = s3c2410_term,
.putc = s3c2410_putc,
.rxready = s3c2410_rxready,
.getc = s3c2410_getc,
};
static int
s3c2410_probe(struct uart_bas *bas)
{
return (0);
}
static void
s3c2410_init(struct uart_bas *bas, int baudrate, int databits, int stopbits,
int parity)
{
if (bas->rclk == 0)
bas->rclk = s3c2410_pclk;
KASSERT(bas->rclk != 0, ("s3c2410_init: Invalid rclk"));
uart_setreg(bas, SSCOM_UCON, 0);
uart_setreg(bas, SSCOM_UFCON,
UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 |
UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET |
UFCON_FIFO_ENABLE);
s3c24x0_uart_param(bas, baudrate, databits, stopbits, parity);
/* Enable UART. */
uart_setreg(bas, SSCOM_UCON, UCON_TXMODE_INT | UCON_RXMODE_INT |
UCON_TOINT);
uart_setreg(bas, SSCOM_UMCON, UMCON_RTS);
}
static void
s3c2410_term(struct uart_bas *bas)
{
/* XXX */
}
static void
s3c2410_putc(struct uart_bas *bas, int c)
{
while ((bus_space_read_4(bas->bst, bas->bsh, SSCOM_UFSTAT) &
UFSTAT_TXFULL) == UFSTAT_TXFULL)
continue;
uart_setreg(bas, SSCOM_UTXH, c);
}
static int
s3c2410_rxready(struct uart_bas *bas)
{
return ((uart_getreg(bas, SSCOM_UTRSTAT) & UTRSTAT_RXREADY) ==
UTRSTAT_RXREADY);
}
static int
s3c2410_getc(struct uart_bas *bas, struct mtx *mtx)
{
while (!sscom_rxrdy(bas->bst, bas->bsh))
continue;
return sscom_getc(bas->bst, bas->bsh);
}
static int s3c2410_bus_probe(struct uart_softc *sc);
static int s3c2410_bus_attach(struct uart_softc *sc);
static int s3c2410_bus_flush(struct uart_softc *, int);
static int s3c2410_bus_getsig(struct uart_softc *);
static int s3c2410_bus_ioctl(struct uart_softc *, int, intptr_t);
static int s3c2410_bus_ipend(struct uart_softc *);
static int s3c2410_bus_param(struct uart_softc *, int, int, int, int);
static int s3c2410_bus_receive(struct uart_softc *);
static int s3c2410_bus_setsig(struct uart_softc *, int);
static int s3c2410_bus_transmit(struct uart_softc *);
static kobj_method_t s3c2410_methods[] = {
KOBJMETHOD(uart_probe, s3c2410_bus_probe),
KOBJMETHOD(uart_attach, s3c2410_bus_attach),
KOBJMETHOD(uart_flush, s3c2410_bus_flush),
KOBJMETHOD(uart_getsig, s3c2410_bus_getsig),
KOBJMETHOD(uart_ioctl, s3c2410_bus_ioctl),
KOBJMETHOD(uart_ipend, s3c2410_bus_ipend),
KOBJMETHOD(uart_param, s3c2410_bus_param),
KOBJMETHOD(uart_receive, s3c2410_bus_receive),
KOBJMETHOD(uart_setsig, s3c2410_bus_setsig),
KOBJMETHOD(uart_transmit, s3c2410_bus_transmit),
{0, 0 }
};
int
s3c2410_bus_probe(struct uart_softc *sc)
{
return (0);
}
static int
s3c2410_bus_attach(struct uart_softc *sc)
{
uintptr_t irq;
switch(s3c2xx0_softc->sc_cpu) {
case CPU_S3C2410:
sc->sc_txfifosz = 16;
sc->sc_rxfifosz = 16;
break;
case CPU_S3C2440:
sc->sc_txfifosz = 64;
sc->sc_rxfifosz = 64;
break;
default:
return (ENXIO);
}
sc->sc_hwiflow = 0;
sc->sc_hwoflow = 0;
irq = rman_get_start(sc->sc_ires);
arm_unmask_irq(irq);
arm_unmask_irq(get_sub_irq(irq, RX_OFF));
arm_unmask_irq(get_sub_irq(irq, TX_OFF));
arm_unmask_irq(get_sub_irq(irq, ERR_OFF));
return (0);
}
static int
s3c2410_bus_transmit(struct uart_softc *sc)
{
uintptr_t irq;
uart_lock(sc->sc_hwmtx);
for (int i = 0; i < sc->sc_txdatasz; i++) {
s3c2410_putc(&sc->sc_bas, sc->sc_txbuf[i]);
uart_barrier(&sc->sc_bas);
}
sc->sc_txbusy = 1;
uart_unlock(sc->sc_hwmtx);
irq = rman_get_start(sc->sc_ires);
arm_unmask_irq(get_sub_irq(irq, TX_OFF));
return (0);
}
static int
s3c2410_bus_setsig(struct uart_softc *sc, int sig)
{
return (0);
}
static int
s3c2410_bus_receive(struct uart_softc *sc)
{
uart_rx_put(sc, uart_getreg(&sc->sc_bas, SSCOM_URXH));
return (0);
}
static int
s3c2410_bus_param(struct uart_softc *sc, int baudrate, int databits,
int stopbits, int parity)
{
int error;
if (sc->sc_bas.rclk == 0)
sc->sc_bas.rclk = s3c2410_pclk;
KASSERT(sc->sc_bas.rclk != 0, ("s3c2410_init: Invalid rclk"));
uart_lock(sc->sc_hwmtx);
error = s3c24x0_uart_param(&sc->sc_bas, baudrate, databits, stopbits,
parity);
uart_unlock(sc->sc_hwmtx);
return (error);
}
static int
s3c2410_bus_ipend(struct uart_softc *sc)
{
uint32_t ufstat, txmask, rxmask;
uintptr_t irq;
int ipend = 0;
uart_lock(sc->sc_hwmtx);
ufstat = bus_space_read_4(sc->sc_bas.bst, sc->sc_bas.bsh, SSCOM_UFSTAT);
uart_unlock(sc->sc_hwmtx);
txmask = rxmask = 0;
switch (s3c2xx0_softc->sc_cpu) {
case CPU_S3C2410:
txmask = UFSTAT_TXCOUNT;
rxmask = UFSTAT_RXCOUNT;
break;
case CPU_S3C2440:
txmask = S3C2440_UFSTAT_TXCOUNT;
rxmask = S3C2440_UFSTAT_RXCOUNT;
break;
}
if ((ufstat & txmask) == 0) {
if (sc->sc_txbusy != 0)
ipend |= SER_INT_TXIDLE;
irq = rman_get_start(sc->sc_ires);
arm_mask_irq(get_sub_irq(irq, TX_OFF));
}
if ((ufstat & rxmask) > 0) {
ipend |= SER_INT_RXREADY;
}
return (ipend);
}
static int
s3c2410_bus_flush(struct uart_softc *sc, int what)
{
return (0);
}
static int
s3c2410_bus_getsig(struct uart_softc *sc)
{
return (0);
}
static int
s3c2410_bus_ioctl(struct uart_softc *sc, int request, intptr_t data)
{
return (EINVAL);
}
struct uart_class uart_s3c2410_class = {
"s3c2410 class",
s3c2410_methods,
1,
.uc_ops = &uart_s3c2410_ops,
.uc_range = 8,
.uc_rclk = 0,
};