5b03aba6c8
files to vendor-provided ones. It should make easier to adopt platform code to new revisions of hardware and to use DTS overlays for various Beaglebone extensions (shields/capes). Original dts filenames were not changed, they're now wrappers over dts files provided by TI. So make sure you update .dtb files on your devices as part of kernel update GPIO addressing was changed: instead of one global /dev/gpioc0 there are per-bank instances of /dev/gpiocX. Each bank has 32 pins so for instance pin 121 on /dev/gpioc0 in old addressing scheme is now pin 25 on /dev/gpioc3 On Pandaboard serial console devices was changed from /dev/ttyu0 to /dev/ttyu2 so you'll have to update /etc/ttys to get login prompt on serial port in multiuser mode. Single user mode serial console should work as-is Differential Revision: https://reviews.freebsd.org/D2146 Reviewed by: rpaulo, ian, Michal Meloun, Svatopluk Kraus
137 lines
4.2 KiB
C
137 lines
4.2 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 <arm/ti/ti_hwmods.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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clk_ident_t clkid;
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/* Enable clocks for this device. We can't continue if that fails. */
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clkid = ti_hwmods_get_clock(sc->sc_dev);
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if (clkid == INVALID_CLK_IDENT) {
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device_printf(sc->sc_dev,
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"failed to get clock based on hwmods\n");
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clkid = UART1_CLK + device_get_unit(sc->sc_dev);
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}
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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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.uc_rshift = 2
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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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{"ti,omap3-uart", (uintptr_t)&uart_ti8250_class},
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{"ti,omap4-uart", (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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