0050ea2415
Re-implement clocks for these SoC by using now standard extres/clk framework. This is necessary for future expansion of these. The new implementation is (due to the size of the patch) only the initial (minimum) version. It will be updated/expanded with a subsequent set of particular patches. This patch is also not tested on OMAP4 based boards (BeagleBone), so all possible issues should be (and will be) fixed by ASAP once identified. Submited by: Oskar Holmlund (oskar.holmlund@ohdata.se) Differential Revision: https://reviews.freebsd.org/D25118
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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 <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 <arm/ti/ti_sysc.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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if ((status = ti_sysc_clock_enable(device_get_parent(sc->sc_dev))) != 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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