294ef64a17
console, it calls the grab functions. These functions should turn off the RX interrupts, and any others that interfere. This makes mountroot prompt work again. If there's more generalized need other than prompting, many of these routines should be expanded to do those new things. Reviewed by: bde (with reservations)
406 lines
9.3 KiB
C
406 lines
9.3 KiB
C
/*
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* Copyright (c) 2003 Marcel Moolenaar
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* Copyright (c) 2007-2009 Andrew Turner
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/tty.h>
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#include <sys/rman.h>
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#include <machine/bus.h>
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#include <machine/intr.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_cpu.h>
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#include <dev/uart/uart_bus.h>
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#include <arm/s3c2xx0/s3c2440reg.h>
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#include <arm/s3c2xx0/uart_dev_s3c2410.h>
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#include <arm/s3c2xx0/s3c2xx0reg.h>
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#include <arm/s3c2xx0/s3c2xx0var.h>
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#include "uart_if.h"
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/* Finds the subirq from the parent */
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#define get_sub_irq(parent, offset) \
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((parent == S3C24X0_INT_UART0) ? S3C24X0_SUBIRQ_MIN + offset : \
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((parent == S3C24X0_INT_UART1) ? S3C24X0_SUBIRQ_MIN + 3 + offset : \
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S3C24X0_SUBIRQ_MIN + 6 + offset))
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#define RX_OFF 0
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#define TX_OFF 1
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#define ERR_OFF 2
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extern unsigned int s3c2410_pclk;
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static int sscomspeed(long, long);
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static int s3c24x0_uart_param(struct uart_bas *, int, int, int, int);
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/*
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* Low-level UART interface.
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*/
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static int s3c2410_probe(struct uart_bas *bas);
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static void s3c2410_init(struct uart_bas *bas, int, int, int, int);
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static void s3c2410_term(struct uart_bas *bas);
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static void s3c2410_putc(struct uart_bas *bas, int);
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static int s3c2410_rxready(struct uart_bas *bas);
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static int s3c2410_getc(struct uart_bas *bas, struct mtx *mtx);
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extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
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static int
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sscomspeed(long speed, long frequency)
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{
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int x;
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if (speed <= 0 || frequency <= 0)
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return -1;
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x = (frequency / 16) / speed;
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return x-1;
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}
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static int
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s3c24x0_uart_param(struct uart_bas *bas, int baudrate, int databits,
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int stopbits, int parity)
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{
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int brd, ulcon;
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ulcon = 0;
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switch(databits) {
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case 5:
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ulcon |= ULCON_LENGTH_5;
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break;
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case 6:
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ulcon |= ULCON_LENGTH_6;
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break;
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case 7:
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ulcon |= ULCON_LENGTH_7;
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break;
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case 8:
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ulcon |= ULCON_LENGTH_8;
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break;
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default:
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return (EINVAL);
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}
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switch (parity) {
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case UART_PARITY_NONE:
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ulcon |= ULCON_PARITY_NONE;
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break;
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case UART_PARITY_ODD:
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ulcon |= ULCON_PARITY_ODD;
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break;
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case UART_PARITY_EVEN:
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ulcon |= ULCON_PARITY_EVEN;
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break;
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case UART_PARITY_MARK:
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case UART_PARITY_SPACE:
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default:
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return (EINVAL);
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}
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if (stopbits == 2)
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ulcon |= ULCON_STOP;
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uart_setreg(bas, SSCOM_ULCON, ulcon);
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brd = sscomspeed(baudrate, bas->rclk);
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uart_setreg(bas, SSCOM_UBRDIV, brd);
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return (0);
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}
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struct uart_ops uart_s3c2410_ops = {
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.probe = s3c2410_probe,
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.init = s3c2410_init,
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.term = s3c2410_term,
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.putc = s3c2410_putc,
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.rxready = s3c2410_rxready,
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.getc = s3c2410_getc,
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};
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static int
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s3c2410_probe(struct uart_bas *bas)
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{
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return (0);
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}
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static void
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s3c2410_init(struct uart_bas *bas, int baudrate, int databits, int stopbits,
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int parity)
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{
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if (bas->rclk == 0)
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bas->rclk = s3c2410_pclk;
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KASSERT(bas->rclk != 0, ("s3c2410_init: Invalid rclk"));
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uart_setreg(bas, SSCOM_UCON, 0);
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uart_setreg(bas, SSCOM_UFCON,
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UFCON_TXTRIGGER_8 | UFCON_RXTRIGGER_8 |
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UFCON_TXFIFO_RESET | UFCON_RXFIFO_RESET |
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UFCON_FIFO_ENABLE);
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s3c24x0_uart_param(bas, baudrate, databits, stopbits, parity);
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/* Enable UART. */
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uart_setreg(bas, SSCOM_UCON, UCON_TXMODE_INT | UCON_RXMODE_INT |
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UCON_TOINT);
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uart_setreg(bas, SSCOM_UMCON, UMCON_RTS);
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}
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static void
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s3c2410_term(struct uart_bas *bas)
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{
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/* XXX */
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}
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static void
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s3c2410_putc(struct uart_bas *bas, int c)
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{
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while ((bus_space_read_4(bas->bst, bas->bsh, SSCOM_UFSTAT) &
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UFSTAT_TXFULL) == UFSTAT_TXFULL)
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continue;
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uart_setreg(bas, SSCOM_UTXH, c);
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}
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static int
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s3c2410_rxready(struct uart_bas *bas)
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{
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return ((uart_getreg(bas, SSCOM_UTRSTAT) & UTRSTAT_RXREADY) ==
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UTRSTAT_RXREADY);
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}
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static int
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s3c2410_getc(struct uart_bas *bas, struct mtx *mtx)
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{
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while (!sscom_rxrdy(bas->bst, bas->bsh))
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continue;
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return sscom_getc(bas->bst, bas->bsh);
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}
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static int s3c2410_bus_probe(struct uart_softc *sc);
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static int s3c2410_bus_attach(struct uart_softc *sc);
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static int s3c2410_bus_flush(struct uart_softc *, int);
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static int s3c2410_bus_getsig(struct uart_softc *);
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static int s3c2410_bus_ioctl(struct uart_softc *, int, intptr_t);
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static int s3c2410_bus_ipend(struct uart_softc *);
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static int s3c2410_bus_param(struct uart_softc *, int, int, int, int);
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static int s3c2410_bus_receive(struct uart_softc *);
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static int s3c2410_bus_setsig(struct uart_softc *, int);
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static int s3c2410_bus_transmit(struct uart_softc *);
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static void s3c2410_bus_grab(struct uart_softc *);
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static void s3c2410_bus_ungrab(struct uart_softc *);
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static kobj_method_t s3c2410_methods[] = {
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KOBJMETHOD(uart_probe, s3c2410_bus_probe),
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KOBJMETHOD(uart_attach, s3c2410_bus_attach),
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KOBJMETHOD(uart_flush, s3c2410_bus_flush),
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KOBJMETHOD(uart_getsig, s3c2410_bus_getsig),
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KOBJMETHOD(uart_ioctl, s3c2410_bus_ioctl),
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KOBJMETHOD(uart_ipend, s3c2410_bus_ipend),
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KOBJMETHOD(uart_param, s3c2410_bus_param),
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KOBJMETHOD(uart_receive, s3c2410_bus_receive),
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KOBJMETHOD(uart_setsig, s3c2410_bus_setsig),
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KOBJMETHOD(uart_transmit, s3c2410_bus_transmit),
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KOBJMETHOD(uart_grab, s3c2410_bus_grab),
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KOBJMETHOD(uart_ungrab, s3c2410_bus_ungrab),
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{0, 0 }
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};
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int
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s3c2410_bus_probe(struct uart_softc *sc)
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{
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switch(s3c2xx0_softc->sc_cpu) {
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case CPU_S3C2410:
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sc->sc_txfifosz = 16;
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sc->sc_rxfifosz = 16;
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break;
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case CPU_S3C2440:
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sc->sc_txfifosz = 64;
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sc->sc_rxfifosz = 64;
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break;
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default:
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return (ENXIO);
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}
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return (0);
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}
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static int
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s3c2410_bus_attach(struct uart_softc *sc)
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{
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uintptr_t irq;
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sc->sc_hwiflow = 0;
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sc->sc_hwoflow = 0;
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irq = rman_get_start(sc->sc_ires);
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arm_unmask_irq(irq);
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arm_unmask_irq(get_sub_irq(irq, RX_OFF));
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arm_unmask_irq(get_sub_irq(irq, TX_OFF));
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arm_unmask_irq(get_sub_irq(irq, ERR_OFF));
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return (0);
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}
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static int
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s3c2410_bus_transmit(struct uart_softc *sc)
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{
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uintptr_t irq;
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uart_lock(sc->sc_hwmtx);
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for (int i = 0; i < sc->sc_txdatasz; i++) {
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s3c2410_putc(&sc->sc_bas, sc->sc_txbuf[i]);
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uart_barrier(&sc->sc_bas);
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}
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sc->sc_txbusy = 1;
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uart_unlock(sc->sc_hwmtx);
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irq = rman_get_start(sc->sc_ires);
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arm_unmask_irq(get_sub_irq(irq, TX_OFF));
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return (0);
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}
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static int
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s3c2410_bus_setsig(struct uart_softc *sc, int sig)
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{
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return (0);
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}
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static int
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s3c2410_bus_receive(struct uart_softc *sc)
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{
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uart_rx_put(sc, uart_getreg(&sc->sc_bas, SSCOM_URXH));
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return (0);
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}
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static int
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s3c2410_bus_param(struct uart_softc *sc, int baudrate, int databits,
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int stopbits, int parity)
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{
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int error;
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if (sc->sc_bas.rclk == 0)
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sc->sc_bas.rclk = s3c2410_pclk;
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KASSERT(sc->sc_bas.rclk != 0, ("s3c2410_init: Invalid rclk"));
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uart_lock(sc->sc_hwmtx);
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error = s3c24x0_uart_param(&sc->sc_bas, baudrate, databits, stopbits,
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parity);
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uart_unlock(sc->sc_hwmtx);
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return (error);
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}
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static int
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s3c2410_bus_ipend(struct uart_softc *sc)
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{
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uint32_t ufstat, txmask, rxmask;
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uintptr_t irq;
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int ipend = 0;
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uart_lock(sc->sc_hwmtx);
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ufstat = bus_space_read_4(sc->sc_bas.bst, sc->sc_bas.bsh, SSCOM_UFSTAT);
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uart_unlock(sc->sc_hwmtx);
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txmask = rxmask = 0;
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switch (s3c2xx0_softc->sc_cpu) {
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case CPU_S3C2410:
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txmask = UFSTAT_TXCOUNT;
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rxmask = UFSTAT_RXCOUNT;
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break;
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case CPU_S3C2440:
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txmask = S3C2440_UFSTAT_TXCOUNT;
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rxmask = S3C2440_UFSTAT_RXCOUNT;
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break;
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}
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if ((ufstat & txmask) == 0) {
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if (sc->sc_txbusy != 0)
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ipend |= SER_INT_TXIDLE;
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irq = rman_get_start(sc->sc_ires);
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arm_mask_irq(get_sub_irq(irq, TX_OFF));
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}
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if ((ufstat & rxmask) > 0) {
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ipend |= SER_INT_RXREADY;
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}
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return (ipend);
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}
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static int
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s3c2410_bus_flush(struct uart_softc *sc, int what)
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{
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return (0);
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}
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static int
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s3c2410_bus_getsig(struct uart_softc *sc)
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{
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return (0);
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}
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static int
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s3c2410_bus_ioctl(struct uart_softc *sc, int request, intptr_t data)
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{
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return (EINVAL);
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}
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static void
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s3c2410_bus_grab(struct uart_softc *sc)
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{
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uintptr_t irq;
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irq = rman_get_start(sc->sc_ires);
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arm_mask_irq(get_sub_irq(irq, RX_OFF));
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}
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static void
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s3c2410_bus_ungrab(struct uart_softc *sc)
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{
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uintptr_t irq;
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irq = rman_get_start(sc->sc_ires);
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arm_unmask_irq(get_sub_irq(irq, RX_OFF));
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}
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struct uart_class uart_s3c2410_class = {
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"s3c2410 class",
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s3c2410_methods,
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1,
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.uc_ops = &uart_s3c2410_ops,
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.uc_range = 8,
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.uc_rclk = 0,
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};
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