1/* $NetBSD: bcm2835_bsc_acpi.c,v 1.4 2021/08/07 16:18:43 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2020 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__KERNEL_RCSID(0, "$NetBSD: bcm2835_bsc_acpi.c,v 1.4 2021/08/07 16:18:43 thorpej Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/cpu.h>
35#include <sys/device.h>
36
37#include <dev/acpi/acpireg.h>
38#include <dev/acpi/acpivar.h>
39#include <dev/acpi/acpi_intr.h>
40#include <dev/acpi/acpi_i2c.h>
41
42#include <arm/broadcom/bcm2835var.h>
43#include <arm/broadcom/bcm2835_mbox.h>
44#include <arm/broadcom/bcm2835_bscvar.h>
45
46#include <evbarm/rpi/vcio.h>
47#include <evbarm/rpi/vcpm.h>
48#include <evbarm/rpi/vcprop.h>
49
50static int	bsciic_acpi_match(device_t, cfdata_t, void *);
51static void	bsciic_acpi_attach(device_t, device_t, void *);
52
53static u_int	bsciic_acpi_vpu_clock_rate(void);
54
55CFATTACH_DECL_NEW(bsciic_acpi, sizeof(struct bsciic_softc), bsciic_acpi_match, bsciic_acpi_attach, NULL, NULL);
56
57static const char * const compatible[] = {
58	"BCM2841",
59	NULL
60};
61
62static struct {
63	struct vcprop_buffer_hdr	vb_hdr;
64	struct vcprop_tag_clockrate	vbt_vpuclockrate;
65	struct vcprop_tag end;
66} vb_vpu __cacheline_aligned = {
67	.vb_hdr = {
68		.vpb_len = sizeof(vb_vpu),
69		.vpb_rcode = VCPROP_PROCESS_REQUEST
70	},
71	.vbt_vpuclockrate = {
72		.tag = {
73			.vpt_tag = VCPROPTAG_GET_CLOCKRATE,
74			.vpt_len = VCPROPTAG_LEN(vb_vpu.vbt_vpuclockrate),
75			.vpt_rcode = VCPROPTAG_REQUEST
76		},
77		.id = VCPROP_CLK_CORE
78	},
79	.end = {
80		.vpt_tag = VCPROPTAG_NULL
81	}
82};
83
84static int
85bsciic_acpi_match(device_t parent, cfdata_t cf, void *aux)
86{
87	struct acpi_attach_args *aa = aux;
88
89	if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
90		return 0;
91
92	return acpi_match_hid(aa->aa_node->ad_devinfo, compatible);
93}
94
95static void
96bsciic_acpi_attach(device_t parent, device_t self, void *aux)
97{
98	struct bsciic_softc * const sc = device_private(self);
99	struct acpi_attach_args *aa = aux;
100	struct i2cbus_attach_args iba;
101	struct acpi_resources res;
102	struct acpi_mem *mem;
103	struct acpi_irq *irq;
104	ACPI_STATUS rv;
105	ACPI_INTEGER clock_freq;
106	void *ih;
107
108	sc->sc_dev = self;
109
110	rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS",
111	    &res, &acpi_resource_parse_ops_default);
112	if (ACPI_FAILURE(rv))
113		return;
114
115	mem = acpi_res_mem(&res, 0);
116	if (mem == NULL) {
117		aprint_error_dev(self, "couldn't find mem resource\n");
118		goto done;
119	}
120
121	irq = acpi_res_irq(&res, 0);
122	if (irq == NULL) {
123		aprint_error_dev(self, "couldn't find irq resource\n");
124		goto done;
125	}
126
127	sc->sc_dev = self;
128	sc->sc_iot = aa->aa_memt;
129	if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, &sc->sc_ioh) != 0) {
130		aprint_error_dev(self, "couldn't map registers\n");
131		goto done;
132	}
133
134	sc->sc_frequency = bsciic_acpi_vpu_clock_rate();
135	if (sc->sc_frequency == 0) {
136		aprint_error_dev(self, "couldn't determine parent clock rate\n");
137		goto done;
138	}
139
140	rv = acpi_dsd_integer(aa->aa_node->ad_handle, "clock-frequency", &clock_freq);
141	if (ACPI_SUCCESS(rv))
142		sc->sc_clkrate = clock_freq;
143	else
144		sc->sc_clkrate = 100000;
145
146	bsciic_attach(sc);
147
148	ih = acpi_intr_establish(self, (uint64_t)aa->aa_node->ad_handle,
149	    IPL_VM, true, bsciic_intr, sc, device_xname(self));
150	if (ih == NULL) {
151		aprint_error_dev(self, "couldn't install interrupt handler\n");
152		goto done;
153	}
154
155	iic_tag_init(&sc->sc_i2c);
156	sc->sc_i2c.ic_cookie = sc;
157	sc->sc_i2c.ic_acquire_bus = bsciic_acquire_bus;
158	sc->sc_i2c.ic_release_bus = bsciic_release_bus;
159	sc->sc_i2c.ic_exec = bsciic_exec;
160
161	memset(&iba, 0, sizeof(iba));
162	iba.iba_tag = &sc->sc_i2c;
163	iba.iba_child_devices = acpi_enter_i2c_devs(self, aa->aa_node);
164	config_found(self, &iba, iicbus_print, CFARGS_NONE);
165
166done:
167	acpi_resource_cleanup(&res);
168}
169
170static u_int
171bsciic_acpi_vpu_clock_rate(void)
172{
173	uint32_t res;
174	int error;
175
176	error = bcmmbox_request(BCMMBOX_CHANARM2VC, &vb_vpu,
177	    sizeof(vb_vpu), &res);
178	if (error != 0) {
179		printf("%s: mbox request failed (%d)\n", __func__, error);
180		return 0;
181	}
182
183	if (!vcprop_buffer_success_p(&vb_vpu.vb_hdr) ||
184	    !vcprop_tag_success_p(&vb_vpu.vbt_vpuclockrate.tag) ||
185	    vb_vpu.vbt_vpuclockrate.rate < 0)
186		return 0;
187
188	return vb_vpu.vbt_vpuclockrate.rate;
189}
190