1 /* $NetBSD: ti_com.c,v 1.12 2023/09/05 02:59:07 gutteridge 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 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
31 __KERNEL_RCSID(1, "$NetBSD: ti_com.c,v 1.12 2023/09/05 02:59:07 gutteridge Exp $");
32
33 #include <sys/param.h>
34 #include <sys/bus.h>
35 #include <sys/device.h>
36 #include <sys/intr.h>
37 #include <sys/systm.h>
38 #include <sys/time.h>
39 #include <sys/termios.h>
40
41 #include <dev/ic/comvar.h>
42
43 #include <dev/fdt/fdtvar.h>
44
45 #include <arch/arm/ti/ti_prcm.h>
46
47 static int ti_com_match(device_t, cfdata_t, void *);
48 static void ti_com_attach(device_t, device_t, void *);
49
50 static const struct device_compatible_entry compat_data[] = {
51 { .compat = "ti,am3352-uart" },
52 { .compat = "ti,omap3-uart" },
53 DEVICE_COMPAT_EOL
54 };
55
56 struct ti_com_softc {
57 struct com_softc ssc_sc;
58 void *ssc_ih;
59 };
60
61 CFATTACH_DECL_NEW(ti_com, sizeof(struct ti_com_softc),
62 ti_com_match, ti_com_attach, NULL, NULL);
63
64 static int
ti_com_match(device_t parent,cfdata_t cf,void * aux)65 ti_com_match(device_t parent, cfdata_t cf, void *aux)
66 {
67 struct fdt_attach_args * const faa = aux;
68
69 return of_compatible_match(faa->faa_phandle, compat_data);
70 }
71
72 static void
ti_com_attach(device_t parent,device_t self,void * aux)73 ti_com_attach(device_t parent, device_t self, void *aux)
74 {
75 struct ti_com_softc * const ssc = device_private(self);
76 struct com_softc * const sc = &ssc->ssc_sc;
77 struct fdt_attach_args * const faa = aux;
78 const int phandle = faa->faa_phandle;
79 bus_space_tag_t bst = faa->faa_bst;
80 bus_space_handle_t bsh;
81 char intrstr[128];
82 bus_addr_t addr;
83 bus_size_t size;
84 int error;
85
86 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
87 aprint_error(": couldn't get registers\n");
88 return;
89 }
90
91 sc->sc_dev = self;
92
93 if (of_getprop_uint32(phandle, "clock-frequency", &sc->sc_frequency) != 0) {
94 aprint_error(": missing 'clock-frequency' property\n");
95 return;
96 }
97
98 sc->sc_type = COM_TYPE_OMAP;
99
100 error = bus_space_map(bst, addr, size, 0, &bsh);
101 if (error) {
102 aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error);
103 return;
104 }
105
106 if (ti_prcm_enable_hwmod(phandle, 0) != 0) {
107 aprint_error(": couldn't enable module\n");
108 return;
109 }
110
111 com_init_regs_stride(&sc->sc_regs, bst, bsh, addr, 2);
112
113 com_attach_subr(sc);
114 aprint_naive("\n");
115
116 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
117 aprint_error_dev(self, "failed to decode interrupt\n");
118 return;
119 }
120
121 ssc->ssc_ih = fdtbus_intr_establish_xname(phandle, 0, IPL_SERIAL,
122 FDT_INTR_MPSAFE, comintr, sc, device_xname(self));
123 if (ssc->ssc_ih == NULL) {
124 aprint_error_dev(self, "failed to establish interrupt on %s\n",
125 intrstr);
126 }
127 aprint_normal_dev(self, "interrupting on %s\n", intrstr);
128 }
129
130 /*
131 * Console support
132 */
133
134 static int
ti_com_console_match(int phandle)135 ti_com_console_match(int phandle)
136 {
137 return of_compatible_match(phandle, compat_data);
138 }
139
140 static void
ti_com_console_consinit(struct fdt_attach_args * faa,u_int uart_freq)141 ti_com_console_consinit(struct fdt_attach_args *faa, u_int uart_freq)
142 {
143 const int phandle = faa->faa_phandle;
144 bus_space_tag_t bst = faa->faa_bst;
145 bus_space_handle_t dummy_bsh;
146 struct com_regs regs;
147 bus_addr_t addr;
148 tcflag_t flags;
149 int speed;
150
151 fdtbus_get_reg(phandle, 0, &addr, NULL);
152 speed = fdtbus_get_stdout_speed();
153 if (speed < 0)
154 speed = 115200; /* default */
155 flags = fdtbus_get_stdout_flags();
156
157 memset(&dummy_bsh, 0, sizeof(dummy_bsh));
158 com_init_regs_stride(®s, bst, dummy_bsh, addr, 2);
159
160 if (comcnattach1(®s, speed, uart_freq, COM_TYPE_NORMAL, flags))
161 panic("Cannot initialize ti com console");
162 }
163
164 static const struct fdt_console ti_com_console = {
165 .match = ti_com_console_match,
166 .consinit = ti_com_console_consinit,
167 };
168
169 FDT_CONSOLE(ti_com, &ti_com_console);
170