1/* $NetBSD: ti_com.c,v 1.12 2023/09/05 02:59:07 gutteridge 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 1.12 2023/09/05 02:59:07 gutteridge 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 struct device_compatible_entry compat_data[] = {
51	{ .compat = "ti,am3352-uart" },
52	{ .compat = "ti,omap3-uart" },
53	DEVICE_COMPAT_EOL
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_compatible_match(faa->faa_phandle, compat_data);
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_tag_t bst = faa->faa_bst;
80	bus_space_handle_t bsh;
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	sc->sc_dev = self;
92
93	if (of_getprop_uint32(phandle, "clock-frequency", &sc->sc_frequency) != 0) {
94		aprint_error(": missing 'clock-frequency' property\n");
95		return;
96	}
97
98	sc->sc_type = COM_TYPE_OMAP;
99
100	error = bus_space_map(bst, addr, size, 0, &bsh);
101	if (error) {
102		aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error);
103		return;
104	}
105
106	if (ti_prcm_enable_hwmod(phandle, 0) != 0) {
107		aprint_error(": couldn't enable module\n");
108		return;
109	}
110
111	com_init_regs_stride(&sc->sc_regs, bst, bsh, addr, 2);
112
113	com_attach_subr(sc);
114	aprint_naive("\n");
115
116	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
117		aprint_error_dev(self, "failed to decode interrupt\n");
118		return;
119	}
120
121	ssc->ssc_ih = fdtbus_intr_establish_xname(phandle, 0, IPL_SERIAL,
122	    FDT_INTR_MPSAFE, comintr, sc, device_xname(self));
123	if (ssc->ssc_ih == NULL) {
124		aprint_error_dev(self, "failed to establish interrupt on %s\n",
125		    intrstr);
126	}
127	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
128}
129
130/*
131 * Console support
132 */
133
134static int
135ti_com_console_match(int phandle)
136{
137	return of_compatible_match(phandle, compat_data);
138}
139
140static void
141ti_com_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
142{
143	const int phandle = faa->faa_phandle;
144	bus_space_tag_t bst = faa->faa_bst;
145	bus_space_handle_t dummy_bsh;
146	struct com_regs regs;
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	memset(&dummy_bsh, 0, sizeof(dummy_bsh));
158	com_init_regs_stride(&regs, bst, dummy_bsh, addr, 2);
159
160	if (comcnattach1(&regs, speed, uart_freq, COM_TYPE_NORMAL, flags))
161		panic("Cannot initialize ti com console");
162}
163
164static const struct fdt_console ti_com_console = {
165	.match = ti_com_console_match,
166	.consinit = ti_com_console_consinit,
167};
168
169FDT_CONSOLE(ti_com, &ti_com_console);
170