xref: /openbsd-src/sys/dev/acpi/com_acpi.c (revision 51da441f69745f9258cf5102dfc160391e0c4f1e)
1 /*	$OpenBSD: com_acpi.c,v 1.11 2023/04/16 11:38:42 kettenis Exp $	*/
2 /*
3  * Copyright (c) 2018 Mark Kettenis
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/param.h>
19 #include <sys/malloc.h>
20 #include <sys/systm.h>
21 #include <sys/tty.h>
22 
23 #include <dev/acpi/acpireg.h>
24 #include <dev/acpi/acpivar.h>
25 #include <dev/acpi/acpidev.h>
26 #include <dev/acpi/amltypes.h>
27 #include <dev/acpi/dsdt.h>
28 
29 #undef DEVNAME
30 #include <dev/ic/comreg.h>
31 #include <dev/ic/comvar.h>
32 #include <dev/cons.h>
33 
34 #define com_usr 31	/* Synopsys DesignWare UART */
35 
36 struct com_acpi_softc {
37 	struct com_softc sc;
38 	struct acpi_softc *sc_acpi;
39 	struct aml_node *sc_node;
40 	void		*sc_ih;
41 };
42 
43 int	com_acpi_match(struct device *, void *, void *);
44 void	com_acpi_attach(struct device *, struct device *, void *);
45 
46 const struct cfattach com_acpi_ca = {
47 	sizeof(struct com_acpi_softc), com_acpi_match, com_acpi_attach,
48 	NULL, com_activate
49 };
50 
51 const char *com_hids[] = {
52 	"AMDI0020",
53 	"HISI0031",
54 	"PNP0501",
55 	NULL
56 };
57 
58 int	com_acpi_is_console(struct com_acpi_softc *);
59 int	com_acpi_is_designware(const char *);
60 int	com_acpi_intr_designware(void *);
61 
62 int
com_acpi_match(struct device * parent,void * match,void * aux)63 com_acpi_match(struct device *parent, void *match, void *aux)
64 {
65 	struct acpi_attach_args *aaa = aux;
66 	struct cfdata *cf = match;
67 	bus_space_handle_t ioh;
68 	bus_space_tag_t iot;
69 	int rv;
70 
71 	if (aaa->aaa_naddr < 1 || aaa->aaa_nirq < 1)
72 		return 0;
73 	if (cf->acpidevcf_addr != aaa->aaa_addr[0] &&
74 	    cf->acpidevcf_addr != ACPIDEVCF_ADDR_UNK)
75 		return 0;
76 
77 	if (!acpi_matchhids(aaa, com_hids, cf->cf_driver->cd_name))
78 		return 0;
79 	if (com_acpi_is_designware(aaa->aaa_dev))
80 		return 1;
81 
82 	if (aaa->aaa_addr[0] == comconsaddr)
83 		return 1;
84 	iot = aaa->aaa_bst[0];
85 	if (bus_space_map(iot, aaa->aaa_addr[0], aaa->aaa_size[0], 0, &ioh))
86 		return 0;
87 	rv = comprobe1(iot, ioh);
88 	bus_space_unmap(iot, ioh, aaa->aaa_size[0]);
89 
90 	return rv;
91 }
92 
93 void
com_acpi_attach(struct device * parent,struct device * self,void * aux)94 com_acpi_attach(struct device *parent, struct device *self, void *aux)
95 {
96 	struct com_acpi_softc *sc = (struct com_acpi_softc *)self;
97 	struct acpi_attach_args *aaa = aux;
98 	int (*intr)(void *) = comintr;
99 
100 	sc->sc_acpi = (struct acpi_softc *)parent;
101 	sc->sc_node = aaa->aaa_node;
102 	printf(" %s", sc->sc_node->name);
103 
104 	printf(" addr 0x%llx/0x%llx", aaa->aaa_addr[0], aaa->aaa_size[0]);
105 	printf(" irq %d", aaa->aaa_irq[0]);
106 
107 	sc->sc.sc_frequency = COM_FREQ;
108 	if (strcmp(aaa->aaa_dev, "AMDI0020") == 0)
109 		sc->sc.sc_frequency = 48000000;
110 
111 	sc->sc.sc_iot = aaa->aaa_bst[0];
112 	sc->sc.sc_iobase = aaa->aaa_addr[0];
113 	sc->sc.sc_frequency = acpi_getpropint(sc->sc_node, "clock-frequency",
114 	    sc->sc.sc_frequency);
115 
116 	if (com_acpi_is_designware(aaa->aaa_dev)) {
117 		intr = com_acpi_intr_designware;
118 		sc->sc.sc_uarttype = COM_UART_16550;
119 		sc->sc.sc_reg_width = acpi_getpropint(sc->sc_node,
120 		    "reg-io-width", 4);
121 		sc->sc.sc_reg_shift = acpi_getpropint(sc->sc_node,
122 		    "reg-shift", 2);
123 
124 		if (com_acpi_is_console(sc)) {
125 			SET(sc->sc.sc_hwflags, COM_HW_CONSOLE);
126 			SET(sc->sc.sc_swflags, COM_SW_SOFTCAR);
127 			comconsfreq = sc->sc.sc_frequency;
128 			comconsrate = B115200;
129 		}
130 	}
131 
132 	if (sc->sc.sc_iobase == comconsaddr) {
133 		sc->sc.sc_ioh = comconsioh;
134 	} else {
135 		if (bus_space_map(sc->sc.sc_iot,
136 		    aaa->aaa_addr[0], aaa->aaa_size[0], 0, &sc->sc.sc_ioh)) {
137 			printf(": can't map registers\n");
138 			return;
139 		}
140 	}
141 
142 	sc->sc_ih = acpi_intr_establish(aaa->aaa_irq[0], aaa->aaa_irq_flags[0],
143 	    IPL_TTY, intr, sc, sc->sc.sc_dev.dv_xname);
144 	if (sc->sc_ih == NULL) {
145 		printf(": can't establish interrupt\n");
146 		return;
147 	}
148 
149 	com_attach_subr(&sc->sc);
150 }
151 
152 int
com_acpi_is_console(struct com_acpi_softc * sc)153 com_acpi_is_console(struct com_acpi_softc *sc)
154 {
155 	struct acpi_table_header *hdr;
156 	struct acpi_spcr *spcr;
157 	struct acpi_gas *base;
158 	struct acpi_q *entry;
159 
160 	SIMPLEQ_FOREACH(entry, &sc->sc_acpi->sc_tables, q_next) {
161 		hdr = entry->q_table;
162 		if (strncmp(hdr->signature, SPCR_SIG,
163 		    sizeof(hdr->signature)) == 0) {
164 			spcr = entry->q_table;
165 			base = &spcr->base_address;
166 			if (base->address_space_id == GAS_SYSTEM_MEMORY &&
167 			    base->address == sc->sc.sc_iobase)
168 				return 1;
169 		}
170 	}
171 
172 	return 0;
173 }
174 
175 int
com_acpi_is_designware(const char * hid)176 com_acpi_is_designware(const char *hid)
177 {
178 	return strcmp(hid, "AMDI0020") == 0 ||
179 	    strcmp(hid, "HISI0031") == 0;
180 }
181 
182 int
com_acpi_intr_designware(void * cookie)183 com_acpi_intr_designware(void *cookie)
184 {
185 	struct com_acpi_softc *sc = cookie;
186 
187 	com_read_reg(&sc->sc, com_usr);
188 
189 	return comintr(&sc->sc);
190 }
191