2 * Copyright (c) 2013 Ian Lepore
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include "opt_platform.h"
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/sysctl.h>
38 #include <machine/bus.h>
40 #include <arm/ti/ti_prcm.h>
42 #include <dev/fdt/fdt_common.h>
43 #include <dev/ofw/ofw_bus.h>
44 #include <dev/ofw/ofw_bus_subr.h>
46 #include <dev/uart/uart.h>
47 #include <dev/uart/uart_cpu.h>
48 #include <dev/uart/uart_bus.h>
49 #include <dev/uart/uart_dev_ns8250.h>
54 * High-level UART interface.
57 struct ns8250_softc ns8250_base;
62 #define MDR1_MODE_UART 0
63 #define MDR1_MODE_DISABLE 7
65 #define SYSCC_SOFTRESET (1 << 1)
67 #define SYSS_STATUS_RESETDONE (1 << 0)
70 ti8250_bus_probe(struct uart_softc *sc)
79 * Get the device id from FDT. If it's not there we can't turn on the
80 * right clocks, so bail, unless we're doing unit 0. We assume that's
81 * the serial console, whose clock isn't controllable anyway, and we
82 * sure don't want to break the console because of a config error.
84 node = ofw_bus_get_node(sc->sc_dev);
85 if ((OF_getprop(node, "uart-device-id", &prop, sizeof(prop))) <= 0) {
86 device_printf(sc->sc_dev,
87 "missing uart-device-id attribute in FDT\n");
88 if (device_get_unit(sc->sc_dev) != 0)
92 devid = fdt32_to_cpu(prop);
94 /* Enable clocks for this device. We can't continue if that fails. */
95 clkid = UART0_CLK + devid;
96 if ((status = ti_prcm_clk_enable(clkid)) != 0)
100 * Set the hardware to disabled mode, do a full device reset, then set
101 * it to uart mode. Most devices will be reset-and-disabled already,
102 * but you never know what a bootloader might have done.
104 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE);
105 uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET);
106 while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE)
108 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART);
110 status = ns8250_bus_probe(sc);
112 device_set_desc(sc->sc_dev, "TI UART (16550 compatible)");
117 static kobj_method_t ti8250_methods[] = {
118 KOBJMETHOD(uart_probe, ti8250_bus_probe),
120 KOBJMETHOD(uart_attach, ns8250_bus_attach),
121 KOBJMETHOD(uart_detach, ns8250_bus_detach),
122 KOBJMETHOD(uart_flush, ns8250_bus_flush),
123 KOBJMETHOD(uart_getsig, ns8250_bus_getsig),
124 KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl),
125 KOBJMETHOD(uart_ipend, ns8250_bus_ipend),
126 KOBJMETHOD(uart_param, ns8250_bus_param),
127 KOBJMETHOD(uart_receive, ns8250_bus_receive),
128 KOBJMETHOD(uart_setsig, ns8250_bus_setsig),
129 KOBJMETHOD(uart_transmit, ns8250_bus_transmit),
133 struct uart_class uart_ti8250_class = {
136 sizeof(struct ti8250_softc),
137 .uc_ops = &uart_ns8250_ops,