plcom_fdt.c revision 1.1 
1/* $NetBSD: plcom_fdt.c,v 1.1 2017/06/02 14:30:58 jmcneill 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 1.1 2017/06/02 14:30:58 jmcneill 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 char * const compatible[] = { "arm,pl011", NULL };
47
48CFATTACH_DECL_NEW(plcom_fdt, sizeof(struct plcom_softc),
49	plcom_fdt_match, plcom_fdt_attach, NULL, NULL);
50
51static int
52plcom_fdt_match(device_t parent, cfdata_t cf, void *aux)
53{
54	struct fdt_attach_args * const faa = aux;
55
56	return of_compatible(faa->faa_phandle, compatible) >= 0;
57}
58
59static void
60plcom_fdt_attach(device_t parent, device_t self, void *aux)
61{
62	struct plcom_softc * const sc = device_private(self);
63	struct fdt_attach_args * const faa = aux;
64	const int phandle = faa->faa_phandle;
65	struct clk *clk;
66	bus_addr_t addr;
67	bus_size_t size;
68	void *ih;
69
70	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
71		aprint_error(": missing 'reg' property\n");
72		return;
73	}
74
75	sc->sc_dev = self;
76
77	/* Enable clocks */
78	for (int i = 0; (clk = fdtbus_clock_get_index(phandle, i)); i++) {
79		if (clk_enable(clk) != 0) {
80			aprint_error(": failed to enable clock #%d\n", i);
81			return;
82		}
83		/* First clock is UARTCLK */
84		if (i == 0)
85			sc->sc_frequency = clk_get_rate(clk);
86	}
87
88	sc->sc_hwflags = PLCOM_HW_TXFIFO_DISABLE;
89	sc->sc_swflags = 0;
90
91	sc->sc_pi.pi_type = PLCOM_TYPE_PL011;
92	sc->sc_pi.pi_flags = PLC_FLAG_32BIT_ACCESS;
93	sc->sc_pi.pi_iot = faa->faa_bst;
94	sc->sc_pi.pi_iobase = addr;
95	if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_pi.pi_ioh)) {
96		aprint_error(": couldn't map device\n");
97		return;
98	}
99	plcom_attach_subr(sc);
100
101	ih = fdtbus_intr_establish(phandle, 0, IPL_SERIAL, FDT_INTR_MPSAFE,
102	    plcomintr, sc);
103	if (ih == NULL) {
104		aprint_error_dev(self, "couldn't install interrupt handler\n");
105		return;
106	}
107}
108
109static int
110plcom_fdt_console_match(int phandle)
111{
112	return of_match_compatible(phandle, compatible);
113}
114
115static void
116plcom_fdt_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
117{
118	static struct plcom_instance pi;
119	bus_addr_t addr;
120	bus_size_t size;
121	tcflag_t flags;
122	int speed;
123
124	if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0)
125		return;
126
127	pi.pi_type = PLCOM_TYPE_PL011;
128	pi.pi_flags = PLC_FLAG_32BIT_ACCESS;
129	pi.pi_iot = faa->faa_bst;
130	pi.pi_iobase = addr;
131	pi.pi_size = size;
132
133	speed = fdtbus_get_stdout_speed();
134	if (speed < 0)
135		speed = 115200;
136	flags = fdtbus_get_stdout_flags();
137
138	plcomcnattach(&pi, speed, uart_freq, flags, -1);
139}
140
141static const struct fdt_console plcom_fdt_console = {
142	.match = plcom_fdt_console_match,
143	.consinit = plcom_fdt_console_consinit,
144};
145
146FDT_CONSOLE(plcom_fdt, &plcom_fdt_console);
147