1/*	$NetBSD: imx_com.c,v 1.3 2021/01/27 03:10:20 thorpej Exp $	*/
2/*-
3 * Copyright (c) 2019 Genetec Corporation.  All rights reserved.
4 * Written by Hashimoto Kenichi for Genetec Corporation.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__KERNEL_RCSID(0, "$NetBSD: imx_com.c,v 1.3 2021/01/27 03:10:20 thorpej Exp $");
30
31#include "opt_fdt.h"
32#include "opt_imxuart.h"
33
34#include <sys/param.h>
35#include <sys/bus.h>
36#include <sys/device.h>
37
38#include <dev/fdt/fdtvar.h>
39
40#include <arm/imx/imxuartreg.h>
41#include <arm/imx/imxuartvar.h>
42
43static int imx_com_match(device_t, struct cfdata *, void *);
44static void imx_com_attach(device_t, device_t, void *);
45
46CFATTACH_DECL_NEW(imx_com, sizeof(struct imxuart_softc),
47    imx_com_match, imx_com_attach, NULL, NULL);
48
49static const struct device_compatible_entry compat_data[] = {
50	{ .compat = "fsl,imx6q-uart" },
51	DEVICE_COMPAT_EOL
52};
53
54static int
55imx_com_match(device_t parent, struct cfdata *cf, void *aux)
56{
57	struct fdt_attach_args * const faa = aux;
58
59	return of_compatible_match(faa->faa_phandle, compat_data);
60}
61
62static void
63imx_com_attach(device_t parent, device_t self, void *aux)
64{
65	struct imxuart_softc *sc = device_private(self);
66	struct imxuart_regs *regsp = &sc->sc_regs;
67	struct fdt_attach_args *faa = aux;
68	const int phandle = faa->faa_phandle;
69	bus_space_tag_t bst = faa->faa_bst;
70	bus_space_handle_t bsh;
71	char intrstr[128];
72	struct clk *per;
73	bus_addr_t addr;
74	bus_size_t size;
75
76	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
77		aprint_error(": couldn't get registers\n");
78		return;
79	}
80
81	if (bus_space_map(bst, addr, size, 0, &bsh) != 0) {
82		aprint_error(": couldn't map registers\n");
83		return;
84	}
85
86	if (fdtbus_clock_enable(phandle, "ipg", false) != 0) {
87		aprint_error(": couldn't enable ipg clock\n");
88		return;
89	}
90
91	per = fdtbus_clock_get(phandle, "per");
92	if (per != NULL && clk_enable(per) != 0) {
93		aprint_error(": couldn't enable per clock\n");
94		return;
95	}
96
97	sc->sc_dev = self;
98	regsp->ur_iot = bst;
99	regsp->ur_iobase = addr;
100	regsp->ur_ioh = bsh;
101
102	if (per != NULL) {
103		aprint_normal(", %u Hz", clk_get_rate(per));
104		/* XXX */
105		imxuart_set_frequency(clk_get_rate(per), 2);
106	}
107
108	if (imxuart_is_console(regsp->ur_iot, regsp->ur_iobase, &regsp->ur_ioh))
109		aprint_normal(" (console)");
110
111	aprint_normal("\n");
112
113	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
114		aprint_error_dev(self, "failed to decode interrupt\n");
115		return;
116	}
117
118	sc->sc_ih = fdtbus_intr_establish_xname(phandle, 0, IPL_SERIAL,
119	    0, imxuintr, sc, device_xname(self));
120	if (sc->sc_ih == NULL) {
121		aprint_error_dev(self, "failed to establish interrupt\n");
122		return;
123	}
124
125	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
126
127	imxuart_attach_subr(sc);
128}
129
130/*
131 * Console support
132 */
133
134static int
135imx_com_console_match(int phandle)
136{
137	return of_compatible_match(phandle, compat_data);
138}
139
140static void
141imx_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_addr_t addr;
146	bus_size_t size;
147	tcflag_t flags;
148	int speed;
149
150	fdtbus_get_reg(phandle, 0, &addr, &size);
151	speed = fdtbus_get_stdout_speed();
152	if (speed < 0)
153		speed = 115200;	/* default */
154	flags = fdtbus_get_stdout_flags();
155
156	imxuart_set_frequency(uart_freq, 2);
157	if (imxuart_cnattach(bst, addr, speed, flags) != 0)
158		panic("cannot attach console UART");
159}
160
161static const struct fdt_console imx_com_console = {
162	.match = imx_com_console_match,
163	.consinit = imx_com_console_consinit,
164};
165
166FDT_CONSOLE(imx_com, &imx_com_console);
167