ti_com.c revision 1.8 
1/* $NetBSD: ti_com.c,v 1.8 2019/10/29 22:19:13 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
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 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30
31__KERNEL_RCSID(1, "$NetBSD: ti_com.c,v 1.8 2019/10/29 22:19:13 jmcneill Exp $");
32
33#include <sys/param.h>
34#include <sys/bus.h>
35#include <sys/device.h>
36#include <sys/intr.h>
37#include <sys/systm.h>
38#include <sys/time.h>
39#include <sys/termios.h>
40
41#include <dev/ic/comvar.h>
42
43#include <dev/fdt/fdtvar.h>
44
45#include <arch/arm/ti/ti_prcm.h>
46
47static int ti_com_match(device_t, cfdata_t, void *);
48static void ti_com_attach(device_t, device_t, void *);
49
50static const char * const compatible[] = {
51	"ti,am3352-uart",
52	"ti,omap3-uart",
53	NULL
54};
55
56struct ti_com_softc {
57	struct com_softc ssc_sc;
58	void *ssc_ih;
59};
60
61CFATTACH_DECL_NEW(ti_com, sizeof(struct ti_com_softc),
62	ti_com_match, ti_com_attach, NULL, NULL);
63
64static int
65ti_com_match(device_t parent, cfdata_t cf, void *aux)
66{
67	struct fdt_attach_args * const faa = aux;
68
69	return of_match_compatible(faa->faa_phandle, compatible);
70}
71
72static void
73ti_com_attach(device_t parent, device_t self, void *aux)
74{
75	struct ti_com_softc * const ssc = device_private(self);
76	struct com_softc * const sc = &ssc->ssc_sc;
77	struct fdt_attach_args * const faa = aux;
78	const int phandle = faa->faa_phandle;
79	bus_space_handle_t bsh;
80	bus_space_tag_t bst;
81	char intrstr[128];
82	bus_addr_t addr;
83	bus_size_t size;
84	int error;
85
86	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
87		aprint_error(": couldn't get registers\n");
88		return;
89	}
90
91	bst = faa->faa_a4x_bst;
92
93	sc->sc_dev = self;
94
95	if (of_getprop_uint32(phandle, "clock-frequency", &sc->sc_frequency) != 0) {
96		aprint_error(": missing 'clock-frequency' property\n");
97		return;
98	}
99
100	sc->sc_type = COM_TYPE_NORMAL;
101
102	error = bus_space_map(bst, addr, size, 0, &bsh);
103	if (error) {
104		aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error);
105		return;
106	}
107
108	if (ti_prcm_enable_hwmod(phandle, 0) != 0) {
109		aprint_error(": couldn't enable module\n");
110		return;
111	}
112
113	com_init_regs(&sc->sc_regs, bst, bsh, addr);
114
115	com_attach_subr(sc);
116	aprint_naive("\n");
117
118	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
119		aprint_error_dev(self, "failed to decode interrupt\n");
120		return;
121	}
122
123	ssc->ssc_ih = fdtbus_intr_establish(phandle, 0, IPL_SERIAL,
124	    FDT_INTR_MPSAFE, comintr, sc);
125	if (ssc->ssc_ih == NULL) {
126		aprint_error_dev(self, "failed to establish interrupt on %s\n",
127		    intrstr);
128	}
129	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
130}
131
132/*
133 * Console support
134 */
135
136static int
137ti_com_console_match(int phandle)
138{
139	return of_match_compatible(phandle, compatible);
140}
141
142static void
143ti_com_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
144{
145	const int phandle = faa->faa_phandle;
146	bus_space_tag_t bst = faa->faa_a4x_bst;
147	bus_addr_t addr;
148	tcflag_t flags;
149	int speed;
150
151	fdtbus_get_reg(phandle, 0, &addr, NULL);
152	speed = fdtbus_get_stdout_speed();
153	if (speed < 0)
154		speed = 115200;	/* default */
155	flags = fdtbus_get_stdout_flags();
156
157	if (comcnattach(bst, addr, speed, uart_freq, COM_TYPE_NORMAL, flags))
158		panic("Cannot initialize ti com console");
159}
160
161static const struct fdt_console ti_com_console = {
162	.match = ti_com_console_match,
163	.consinit = ti_com_console_consinit,
164};
165
166FDT_CONSOLE(ti_com, &ti_com_console);
167