ti_com.c revision 1.1 
1/* $NetBSD: ti_com.c,v 1.1 2017/10/26 01:16:32 jakllsch 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 1.1 2017/10/26 01:16:32 jakllsch 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
45static int ti_com_match(device_t, cfdata_t, void *);
46static void ti_com_attach(device_t, device_t, void *);
47
48static const char * const compatible[] = {
49	"ti,am3352-uart",
50	"ti,omap3-uart",
51	NULL
52};
53
54struct ti_com_softc {
55	struct com_softc ssc_sc;
56	void *ssc_ih;
57
58	struct clk *ssc_clk;
59	struct fdtbus_reset *ssc_rst;
60};
61
62CFATTACH_DECL_NEW(ti_com, sizeof(struct ti_com_softc),
63	ti_com_match, ti_com_attach, NULL, NULL);
64
65static int
66ti_com_match(device_t parent, cfdata_t cf, void *aux)
67{
68	struct fdt_attach_args * const faa = aux;
69
70	return of_match_compatible(faa->faa_phandle, compatible);
71}
72
73static void
74ti_com_attach(device_t parent, device_t self, void *aux)
75{
76	struct ti_com_softc * const ssc = device_private(self);
77	struct com_softc * const sc = &ssc->ssc_sc;
78	struct fdt_attach_args * const faa = aux;
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(faa->faa_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	ssc->ssc_clk = fdtbus_clock_get_index(faa->faa_phandle, 0);
96	ssc->ssc_rst = fdtbus_reset_get_index(faa->faa_phandle, 0);
97
98#if 0
99	if (ssc->ssc_clk == NULL) {
100		aprint_error(": couldn't get frequency\n");
101		return;
102	}
103
104	sc->sc_frequency = clk_get_rate(ssc->ssc_clk);
105#else
106	sc->sc_frequency = 48000000;
107#endif
108	sc->sc_type = COM_TYPE_NORMAL;
109
110	error = bus_space_map(bst, addr, size, 0, &bsh);
111	if (error) {
112		aprint_error(": couldn't map %#llx: %d", (uint64_t)addr, error);
113		return;
114	}
115
116	COM_INIT_REGS(sc->sc_regs, bst, bsh, addr);
117
118	com_attach_subr(sc);
119	aprint_naive("\n");
120
121	if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) {
122		aprint_error_dev(self, "failed to decode interrupt\n");
123		return;
124	}
125
126	ssc->ssc_ih = fdtbus_intr_establish(faa->faa_phandle, 0, IPL_SERIAL,
127	    FDT_INTR_MPSAFE, comintr, sc);
128	if (ssc->ssc_ih == NULL) {
129		aprint_error_dev(self, "failed to establish interrupt on %s\n",
130		    intrstr);
131	}
132	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
133}
134
135/*
136 * Console support
137 */
138
139static int
140ti_com_console_match(int phandle)
141{
142	return of_match_compatible(phandle, compatible);
143}
144
145static void
146ti_com_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
147{
148	const int phandle = faa->faa_phandle;
149	bus_space_tag_t bst = faa->faa_a4x_bst;
150	bus_addr_t addr;
151	tcflag_t flags;
152	int speed;
153
154	fdtbus_get_reg(phandle, 0, &addr, NULL);
155	speed = fdtbus_get_stdout_speed();
156	if (speed < 0)
157		speed = 115200;	/* default */
158	flags = fdtbus_get_stdout_flags();
159
160	if (comcnattach(bst, addr, 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