1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2013 Ian Lepore
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "opt_platform.h"
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/conf.h>
35 #include <sys/kernel.h>
36 #include <sys/sysctl.h>
37 #include <machine/bus.h>
38
39 #include <dev/fdt/fdt_common.h>
40 #include <dev/ofw/ofw_bus.h>
41 #include <dev/ofw/ofw_bus_subr.h>
42
43 #include <dev/uart/uart.h>
44 #include <dev/uart/uart_cpu.h>
45 #include <dev/uart/uart_cpu_fdt.h>
46 #include <dev/uart/uart_bus.h>
47 #include <dev/uart/uart_dev_ns8250.h>
48
49 #include <arm/ti/ti_sysc.h>
50
51 #include "uart_if.h"
52
53 /*
54 * High-level UART interface.
55 */
56 struct ti8250_softc {
57 struct ns8250_softc ns8250_base;
58 /*uint32_t mystuff;*/
59 };
60
61 #define MDR1_REG 8
62 #define MDR1_MODE_UART 0
63 #define MDR1_MODE_DISABLE 7
64 #define SYSCC_REG 15
65 #define SYSCC_SOFTRESET (1 << 1)
66 #define SYSS_REG 16
67 #define SYSS_STATUS_RESETDONE (1 << 0)
68
69 static int
ti8250_bus_probe(struct uart_softc * sc)70 ti8250_bus_probe(struct uart_softc *sc)
71 {
72 int status;
73
74 if ((status = ti_sysc_clock_enable(device_get_parent(sc->sc_dev))) != 0)
75 return (status);
76
77 /*
78 * Set the hardware to disabled mode, do a full device reset, then set
79 * it to uart mode. Most devices will be reset-and-disabled already,
80 * but you never know what a bootloader might have done.
81 */
82 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE);
83 uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET);
84 while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE)
85 continue;
86 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART);
87
88 status = ns8250_bus_probe(sc);
89 if (status == 0)
90 device_set_desc(sc->sc_dev, "TI UART (16550 compatible)");
91
92 return (status);
93 }
94
95 static kobj_method_t ti8250_methods[] = {
96 KOBJMETHOD(uart_probe, ti8250_bus_probe),
97
98 KOBJMETHOD(uart_attach, ns8250_bus_attach),
99 KOBJMETHOD(uart_detach, ns8250_bus_detach),
100 KOBJMETHOD(uart_flush, ns8250_bus_flush),
101 KOBJMETHOD(uart_getsig, ns8250_bus_getsig),
102 KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl),
103 KOBJMETHOD(uart_ipend, ns8250_bus_ipend),
104 KOBJMETHOD(uart_param, ns8250_bus_param),
105 KOBJMETHOD(uart_receive, ns8250_bus_receive),
106 KOBJMETHOD(uart_setsig, ns8250_bus_setsig),
107 KOBJMETHOD(uart_transmit, ns8250_bus_transmit),
108 KOBJMETHOD(uart_txbusy, ns8250_bus_txbusy),
109 KOBJMETHOD_END
110 };
111
112 static struct uart_class uart_ti8250_class = {
113 "ti8250",
114 ti8250_methods,
115 sizeof(struct ti8250_softc),
116 .uc_ops = &uart_ns8250_ops,
117 .uc_range = 0x88,
118 .uc_rclk = 48000000,
119 .uc_rshift = 2
120 };
121 static struct ofw_compat_data compat_data[] = {
122 {"ti,ns16550", (uintptr_t)&uart_ti8250_class},
123 {"ti,omap3-uart", (uintptr_t)&uart_ti8250_class},
124 {"ti,omap4-uart", (uintptr_t)&uart_ti8250_class},
125 {NULL, (uintptr_t)NULL},
126 };
127 UART_FDT_CLASS_AND_DEVICE(compat_data);
128