plcom_fdt.c revision 1.5 
1/* $NetBSD: plcom_fdt.c,v 1.5 2021/01/27 03:10:19 thorpej 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: plcom_fdt.c,v 1.5 2021/01/27 03:10:19 thorpej Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/systm.h>
36#include <sys/kernel.h>
37
38#include <dev/fdt/fdtvar.h>
39
40#include <evbarm/dev/plcomreg.h>
41#include <evbarm/dev/plcomvar.h>
42
43static int	plcom_fdt_match(device_t, cfdata_t, void *);
44static void	plcom_fdt_attach(device_t, device_t, void *);
45
46static const struct device_compatible_entry compat_data[] = {
47	{ .compat = "arm,pl011" },
48	DEVICE_COMPAT_EOL
49};
50
51CFATTACH_DECL_NEW(plcom_fdt, sizeof(struct plcom_softc),
52	plcom_fdt_match, plcom_fdt_attach, NULL, NULL);
53
54static int
55plcom_fdt_match(device_t parent, cfdata_t 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
63plcom_fdt_attach(device_t parent, device_t self, void *aux)
64{
65	struct plcom_softc * const sc = device_private(self);
66	struct fdt_attach_args * const faa = aux;
67	const int phandle = faa->faa_phandle;
68	char intrstr[128];
69	struct clk *clk;
70	bus_addr_t addr;
71	bus_size_t size;
72	void *ih;
73
74	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
75		aprint_error(": missing 'reg' property\n");
76		return;
77	}
78
79	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
80		aprint_error(": failed to decode interrupt\n");
81		return;
82	}
83
84	sc->sc_dev = self;
85
86	/* Enable clocks */
87	for (int i = 0; (clk = fdtbus_clock_get_index(phandle, i)); i++) {
88		if (clk_enable(clk) != 0) {
89			aprint_error(": failed to enable clock #%d\n", i);
90			return;
91		}
92		/* First clock is UARTCLK */
93		if (i == 0)
94			sc->sc_frequency = clk_get_rate(clk);
95	}
96
97	sc->sc_hwflags = PLCOM_HW_TXFIFO_DISABLE;
98	sc->sc_swflags = 0;
99
100	sc->sc_pi.pi_type = PLCOM_TYPE_PL011;
101	sc->sc_pi.pi_flags = PLC_FLAG_32BIT_ACCESS;
102	sc->sc_pi.pi_iot = faa->faa_bst;
103	sc->sc_pi.pi_iobase = addr;
104	if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_pi.pi_ioh)) {
105		aprint_error(": couldn't map device\n");
106		return;
107	}
108
109	aprint_naive("\n");
110	aprint_normal(": ARM PL011 UART\n");
111
112	plcom_attach_subr(sc);
113
114	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
115
116	ih = fdtbus_intr_establish_xname(phandle, 0, IPL_SERIAL, FDT_INTR_MPSAFE,
117	    plcomintr, sc, device_xname(self));
118	if (ih == NULL) {
119		aprint_error_dev(self, "couldn't install interrupt handler\n");
120		return;
121	}
122}
123
124static int
125plcom_fdt_console_match(int phandle)
126{
127	return of_compatible_match(phandle, compat_data);
128}
129
130static void
131plcom_fdt_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
132{
133	static struct plcom_instance pi;
134	bus_addr_t addr;
135	bus_size_t size;
136	tcflag_t flags;
137	int speed;
138
139	if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0)
140		return;
141
142	pi.pi_type = PLCOM_TYPE_PL011;
143	pi.pi_flags = PLC_FLAG_32BIT_ACCESS;
144	pi.pi_iot = faa->faa_bst;
145	pi.pi_iobase = addr;
146	pi.pi_size = size;
147
148	speed = fdtbus_get_stdout_speed();
149	if (speed < 0)
150		speed = 115200;
151	flags = fdtbus_get_stdout_flags();
152
153	plcomcnattach(&pi, speed, uart_freq, flags, -1);
154}
155
156static const struct fdt_console plcom_fdt_console = {
157	.match = plcom_fdt_console_match,
158	.consinit = plcom_fdt_console_consinit,
159};
160
161FDT_CONSOLE(plcom_fdt, &plcom_fdt_console);
162