1 /* $NetBSD: bcm2835_emmc_acpi.c,v 1.1 2019/12/30 18:53:34 jmcneill Exp $ */
2
3 /*
4 * Copyright (c) 2016 Kimihiro Nonaka <nonaka@NetBSD.org>
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. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
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: bcm2835_emmc_acpi.c,v 1.1 2019/12/30 18:53:34 jmcneill Exp $");
30
31 #include <sys/param.h>
32 #include <sys/device.h>
33 #include <sys/systm.h>
34 #include <sys/kmem.h>
35
36 #include <dev/acpi/acpireg.h>
37 #include <dev/acpi/acpivar.h>
38 #include <dev/acpi/acpi_intr.h>
39
40 #include <dev/sdmmc/sdhcreg.h>
41 #include <dev/sdmmc/sdhcvar.h>
42 #include <dev/sdmmc/sdmmcvar.h>
43
44 #include <arm/broadcom/bcm2835var.h>
45 #include <arm/broadcom/bcm2835_mbox.h>
46
47 #include <evbarm/rpi/vcio.h>
48 #include <evbarm/rpi/vcpm.h>
49 #include <evbarm/rpi/vcprop.h>
50
51 #define _COMPONENT ACPI_RESOURCE_COMPONENT
52 ACPI_MODULE_NAME ("bcmemmc_acpi")
53
54 static int bcmemmc_acpi_match(device_t, cfdata_t, void *);
55 static void bcmemmc_acpi_attach(device_t, device_t, void *);
56 static void bcmemmc_acpi_attach1(device_t);
57
58 static u_int bcmemmc_acpi_emmc_clock_rate(void);
59
60 static const char * const compatible[] = {
61 "BCM2847",
62 NULL
63 };
64
65 static struct {
66 struct vcprop_buffer_hdr vb_hdr;
67 struct vcprop_tag_clockrate vbt_emmcclockrate;
68 struct vcprop_tag end;
69 } vb_emmc __cacheline_aligned = {
70 .vb_hdr = {
71 .vpb_len = sizeof(vb_emmc),
72 .vpb_rcode = VCPROP_PROCESS_REQUEST,
73 },
74 .vbt_emmcclockrate = {
75 .tag = {
76 .vpt_tag = VCPROPTAG_GET_CLOCKRATE,
77 .vpt_len = VCPROPTAG_LEN(vb_emmc.vbt_emmcclockrate),
78 .vpt_rcode = VCPROPTAG_REQUEST
79 },
80 .id = VCPROP_CLK_EMMC
81 },
82 .end = {
83 .vpt_tag = VCPROPTAG_NULL
84 }
85 };
86
87 struct bcmemmc_acpi_softc {
88 struct sdhc_softc sc;
89 bus_space_tag_t sc_memt;
90 bus_space_handle_t sc_memh;
91 bus_size_t sc_memsize;
92 void *sc_ih;
93 struct sdhc_host *sc_hosts[1];
94 };
95
96 CFATTACH_DECL_NEW(bcmemmc_acpi, sizeof(struct bcmemmc_acpi_softc),
97 bcmemmc_acpi_match, bcmemmc_acpi_attach, NULL, NULL);
98
99 static int
bcmemmc_acpi_match(device_t parent,cfdata_t match,void * opaque)100 bcmemmc_acpi_match(device_t parent, cfdata_t match, void *opaque)
101 {
102 struct acpi_attach_args *aa = opaque;
103
104 if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
105 return 0;
106
107 return acpi_match_hid(aa->aa_node->ad_devinfo, compatible);
108 }
109
110 static void
bcmemmc_acpi_attach(device_t parent,device_t self,void * opaque)111 bcmemmc_acpi_attach(device_t parent, device_t self, void *opaque)
112 {
113 struct bcmemmc_acpi_softc *sc = device_private(self);
114 struct acpi_attach_args *aa = opaque;
115 struct acpi_resources res;
116 struct acpi_mem *mem;
117 struct acpi_irq *irq;
118 ACPI_STATUS rv;
119
120 sc->sc.sc_dev = self;
121 sc->sc.sc_dmat = aa->aa_dmat;
122 sc->sc.sc_host = sc->sc_hosts;
123 sc->sc_memt = aa->aa_memt;
124
125 rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS",
126 &res, &acpi_resource_parse_ops_default);
127 if (ACPI_FAILURE(rv))
128 return;
129
130 mem = acpi_res_mem(&res, 0);
131 irq = acpi_res_irq(&res, 0);
132 if (mem == NULL || irq == NULL) {
133 aprint_error_dev(self, "incomplete resources\n");
134 goto cleanup;
135 }
136 if (mem->ar_length == 0) {
137 aprint_error_dev(self, "zero length memory resource\n");
138 goto cleanup;
139 }
140 sc->sc_memsize = mem->ar_length;
141
142 if (bus_space_map(sc->sc_memt, mem->ar_base, sc->sc_memsize, 0,
143 &sc->sc_memh)) {
144 aprint_error_dev(self, "couldn't map registers\n");
145 goto cleanup;
146 }
147
148 sc->sc.sc_flags = SDHC_FLAG_32BIT_ACCESS |
149 SDHC_FLAG_HOSTCAPS |
150 SDHC_FLAG_NO_HS_BIT;
151 sc->sc.sc_caps = SDHC_VOLTAGE_SUPP_3_3V | SDHC_HIGH_SPEED_SUPP |
152 (SDHC_MAX_BLK_LEN_1024 << SDHC_MAX_BLK_LEN_SHIFT);
153
154 sc->sc_ih = acpi_intr_establish(self,
155 (uint64_t)(uintptr_t)aa->aa_node->ad_handle,
156 IPL_BIO, true, sdhc_intr, &sc->sc, device_xname(self));
157 if (sc->sc_ih == NULL) {
158 aprint_error_dev(self,
159 "couldn't establish interrupt handler\n");
160 goto unmap;
161 }
162
163 config_defer(self, bcmemmc_acpi_attach1);
164
165 acpi_resource_cleanup(&res);
166 return;
167
168 unmap:
169 bus_space_unmap(sc->sc_memt, sc->sc_memh, sc->sc_memsize);
170 sc->sc_memsize = 0;
171 cleanup:
172 acpi_resource_cleanup(&res);
173 }
174
175 static void
bcmemmc_acpi_attach1(device_t self)176 bcmemmc_acpi_attach1(device_t self)
177 {
178 struct bcmemmc_acpi_softc *sc = device_private(self);
179
180 sc->sc.sc_clkbase = bcmemmc_acpi_emmc_clock_rate() / 1000;
181
182 if (sdhc_host_found(&sc->sc, sc->sc_memt, sc->sc_memh,
183 sc->sc_memsize) != 0) {
184 aprint_error_dev(self, "couldn't initialize host\n");
185 goto fail;
186 }
187
188 return;
189
190 fail:
191 if (sc->sc_ih != NULL)
192 acpi_intr_disestablish(sc->sc_ih);
193 sc->sc_ih = NULL;
194 }
195
196 static u_int
bcmemmc_acpi_emmc_clock_rate(void)197 bcmemmc_acpi_emmc_clock_rate(void)
198 {
199 uint32_t res;
200 int error;
201
202 error = bcmmbox_request(BCMMBOX_CHANARM2VC, &vb_emmc,
203 sizeof(vb_emmc), &res);
204 if (error) {
205 printf("%s: mbox request failed (%d)\n", __func__, error);
206 return 0;
207 }
208
209 if (!vcprop_buffer_success_p(&vb_emmc.vb_hdr) ||
210 !vcprop_tag_success_p(&vb_emmc.vbt_emmcclockrate.tag) ||
211 vb_emmc.vbt_emmcclockrate.rate < 0)
212 return 0;
213
214 return vb_emmc.vbt_emmcclockrate.rate;
215 }
216