3bb693af87
uart implementations, and export them using the new linker-set mechanism. Differential Revision: https://reviews.freebsd.org/D1993 Submitted by: Michal Meloun
147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/*-
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* Copyright (c) 2013 Ian Lepore
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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 "opt_platform.h"
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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/kernel.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <arm/ti/ti_prcm.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.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_cpu_fdt.h>
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#include <dev/uart/uart_bus.h>
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#include <dev/uart/uart_dev_ns8250.h>
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#include "uart_if.h"
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/*
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* High-level UART interface.
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*/
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struct ti8250_softc {
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struct ns8250_softc ns8250_base;
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/*uint32_t mystuff;*/
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};
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#define MDR1_REG 8
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#define MDR1_MODE_UART 0
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#define MDR1_MODE_DISABLE 7
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#define SYSCC_REG 15
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#define SYSCC_SOFTRESET (1 << 1)
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#define SYSS_REG 16
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#define SYSS_STATUS_RESETDONE (1 << 0)
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static int
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ti8250_bus_probe(struct uart_softc *sc)
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{
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int status;
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int devid;
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clk_ident_t clkid;
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pcell_t prop;
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phandle_t node;
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/*
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* Get the device id from FDT. If it's not there we can't turn on the
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* right clocks, so bail, unless we're doing unit 0. We assume that's
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* the serial console, whose clock isn't controllable anyway, and we
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* sure don't want to break the console because of a config error.
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*/
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node = ofw_bus_get_node(sc->sc_dev);
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if ((OF_getprop(node, "uart-device-id", &prop, sizeof(prop))) <= 0) {
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device_printf(sc->sc_dev,
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"missing uart-device-id attribute in FDT\n");
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if (device_get_unit(sc->sc_dev) != 0)
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return (ENXIO);
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devid = 0;
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} else
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devid = fdt32_to_cpu(prop);
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/* Enable clocks for this device. We can't continue if that fails. */
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clkid = UART0_CLK + devid;
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if ((status = ti_prcm_clk_enable(clkid)) != 0)
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return (status);
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/*
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* Set the hardware to disabled mode, do a full device reset, then set
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* it to uart mode. Most devices will be reset-and-disabled already,
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* but you never know what a bootloader might have done.
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*/
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uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE);
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uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET);
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while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE)
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continue;
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uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART);
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status = ns8250_bus_probe(sc);
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if (status == 0)
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device_set_desc(sc->sc_dev, "TI UART (16550 compatible)");
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return (status);
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}
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static kobj_method_t ti8250_methods[] = {
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KOBJMETHOD(uart_probe, ti8250_bus_probe),
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KOBJMETHOD(uart_attach, ns8250_bus_attach),
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KOBJMETHOD(uart_detach, ns8250_bus_detach),
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KOBJMETHOD(uart_flush, ns8250_bus_flush),
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KOBJMETHOD(uart_getsig, ns8250_bus_getsig),
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KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl),
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KOBJMETHOD(uart_ipend, ns8250_bus_ipend),
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KOBJMETHOD(uart_param, ns8250_bus_param),
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KOBJMETHOD(uart_receive, ns8250_bus_receive),
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KOBJMETHOD(uart_setsig, ns8250_bus_setsig),
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KOBJMETHOD(uart_transmit, ns8250_bus_transmit),
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KOBJMETHOD_END
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};
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static struct uart_class uart_ti8250_class = {
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"ti8250",
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ti8250_methods,
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sizeof(struct ti8250_softc),
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.uc_ops = &uart_ns8250_ops,
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.uc_range = 0x88,
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.uc_rclk = 48000000
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};
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static struct ofw_compat_data compat_data[] = {
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{"ti,ns16550", (uintptr_t)&uart_ti8250_class},
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{NULL, (uintptr_t)NULL},
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};
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UART_FDT_CLASS_AND_DEVICE(compat_data);
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