1/* $NetBSD: bcm2835_com.c,v 1.9 2023/12/11 12:53:08 mlelstv 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: bcm2835_com.c,v 1.9 2023/12/11 12:53:08 mlelstv Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/intr.h>
36#include <sys/systm.h>
37#include <sys/termios.h>
38
39#include <arm/broadcom/bcm2835reg.h>
40#include <arm/broadcom/bcm2835var.h>
41#include <arm/broadcom/bcm2835_intr.h>
42
43#include <dev/fdt/fdtvar.h>
44
45#include <dev/ic/comvar.h>
46
47static int	bcm_com_match(device_t, cfdata_t, void *);
48static void	bcm_com_attach(device_t, device_t, void *);
49
50CFATTACH_DECL_NEW(bcmcom, sizeof(struct com_softc),
51	bcm_com_match, bcm_com_attach, NULL, NULL);
52
53static const struct device_compatible_entry compat_data[] = {
54	{ .compat = "brcm,bcm2835-aux-uart" },
55	DEVICE_COMPAT_EOL
56};
57
58static int
59bcm_com_match(device_t parent, cfdata_t cf, void *aux)
60{
61	struct fdt_attach_args * const faa = aux;
62
63	return of_compatible_match(faa->faa_phandle, compat_data);
64}
65
66static void
67bcm_com_attach(device_t parent, device_t self, void *aux)
68{
69	struct com_softc * const sc = device_private(self);
70	struct fdt_attach_args * const faa = aux;
71	const int phandle = faa->faa_phandle;
72
73	bus_space_tag_t bst = faa->faa_bst;
74	bus_space_handle_t bsh;
75	bus_addr_t addr;
76	bus_size_t size;
77	void *ih;
78
79	sc->sc_dev = self;
80	sc->sc_type = COM_TYPE_BCMAUXUART;
81
82	int error = fdtbus_get_reg(phandle, 0, &addr, &size);
83	if (error) {
84		aprint_error_dev(sc->sc_dev, "unable to map device\n");
85		return;
86	}
87
88	if (com_is_console(bst, addr, &bsh) == 0 &&
89	    bus_space_map(bst, addr, size, 0, &bsh) != 0) {
90		aprint_error(": can't map device\n");
91		return;
92	}
93
94	/* Enable clocks */
95	struct clk *clk;
96	for (int i = 0; (clk = fdtbus_clock_get_index(phandle, i)); i++) {
97		if (clk_enable(clk) != 0) {
98			aprint_error(": failed to enable clock #%d\n", i);
99			return;
100		}
101		/* First clock is UARTCLK */
102		if (i == 0)
103			sc->sc_frequency = clk_get_rate(clk);
104	}
105
106	sc->sc_frequency *= 2;
107
108	com_init_regs_stride(&sc->sc_regs, bst, bsh, addr, 2);
109
110	com_attach_subr(sc);
111	aprint_naive("\n");
112
113	char intrstr[128];
114	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
115		aprint_error(": failed to decode interrupt\n");
116		return;
117	}
118
119	ih = fdtbus_intr_establish_xname(phandle, 0, IPL_SERIAL, FDT_INTR_MPSAFE,
120	    comintr, sc, device_xname(sc->sc_dev));
121	if (ih == NULL) {
122		aprint_error_dev(self, "failed to establish interrupt %s\n",
123		    intrstr);
124		return;
125	}
126	aprint_normal_dev(self, "interrupting on %s, clock %u Hz\n",
127	   intrstr, sc->sc_frequency);
128}
129
130static int
131bcmaux_com_console_match(int phandle)
132{
133
134	return of_compatible_match(phandle, compat_data);
135}
136
137static void
138bcmaux_com_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
139{
140	const int phandle = faa->faa_phandle;
141	bus_space_tag_t bst = faa->faa_bst;
142	bus_space_handle_t dummy_bsh;
143	struct com_regs regs;
144	bus_addr_t addr;
145	tcflag_t flags;
146	int speed;
147
148	fdtbus_get_reg(phandle, 0, &addr, NULL);
149	speed = fdtbus_get_stdout_speed();
150	if (speed < 0)
151		speed = 115200;	/* default */
152	flags = fdtbus_get_stdout_flags();
153
154	memset(&dummy_bsh, 0, sizeof(dummy_bsh));
155	com_init_regs_stride(&regs, bst, dummy_bsh, addr, 2);
156
157	if (comcnattach1(&regs, speed, uart_freq, COM_TYPE_BCMAUXUART,
158	    flags))
159		panic("Cannot initialize bcm com console");
160
161	cn_set_magic("+++++");
162}
163
164static const struct fdt_console bcmaux_com_console = {
165	.match = bcmaux_com_console_match,
166	.consinit = bcmaux_com_console_consinit,
167};
168
169FDT_CONSOLE(bcmcom, &bcmaux_com_console);
170