1 /* $NetBSD: com_eumb.c,v 1.12 2021/03/25 05:35:50 rin Exp $ */
2
3 /*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Tohru Nishimura.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: com_eumb.c,v 1.12 2021/03/25 05:35:50 rin Exp $");
34
35 #include <sys/param.h>
36 #include <sys/device.h>
37 #include <sys/tty.h>
38 #include <sys/systm.h>
39
40 #include <sys/bus.h>
41 #include <machine/intr.h>
42
43 #include <dev/ic/comreg.h>
44 #include <dev/ic/comvar.h>
45
46 #include <sandpoint/sandpoint/eumbvar.h>
47 #include "locators.h"
48
49 static int com_eumb_match(device_t, cfdata_t , void *);
50 static void com_eumb_attach(device_t, device_t, void *);
51
52 CFATTACH_DECL_NEW(com_eumb, sizeof(struct com_softc),
53 com_eumb_match, com_eumb_attach, NULL, NULL);
54
55 static int found;
56 static struct com_regs cnregs;
57
58 /*
59 * There are two different UART configurations: single 4-wire UART
60 * and dual 2-wire. The DCR register selects one of the two operating
61 * modes. A certain group of NAS boxes uses the 2nd UART as system
62 * console while using the 1st to communicate with the power management
63 * satellite processor. The "unit" locator helps to reverse the two.
64 * Default is a single 4-wire UART as console.
65 */
66 int
com_eumb_match(device_t parent,cfdata_t cf,void * aux)67 com_eumb_match(device_t parent, cfdata_t cf, void *aux)
68 {
69 struct eumb_attach_args *eaa = aux;
70 int unit = eaa->eumb_unit;
71
72 if (unit == EUMBCF_UNIT_DEFAULT && found == 0)
73 return 1;
74 if (unit == 0 || unit == 1)
75 return 1;
76 return 0;
77 }
78
79 void
com_eumb_attach(device_t parent,device_t self,void * aux)80 com_eumb_attach(device_t parent, device_t self, void *aux)
81 {
82 struct com_softc *sc = device_private(self);
83 struct eumb_attach_args *eaa = aux;
84 int comaddr, epicirq;
85 bus_space_handle_t ioh;
86 extern u_long ticks_per_sec;
87
88 sc->sc_dev = self;
89 found = 1;
90
91 comaddr = (eaa->eumb_unit == 1) ? 0x4600 : 0x4500;
92 if (com_is_console(eaa->eumb_bt, comaddr, &ioh)) {
93 cnregs.cr_ioh = ioh;
94 sc->sc_regs = cnregs;
95 } else {
96 bus_space_map(eaa->eumb_bt, comaddr, COM_NPORTS, 0, &ioh);
97 com_init_regs(&sc->sc_regs, eaa->eumb_bt, ioh, comaddr);
98 }
99 sc->sc_frequency = 4 * ticks_per_sec;
100 epicirq = (eaa->eumb_unit == 1) ? 25 : 24;
101
102 /*
103 * XXX
104 * At least KuroBox Classic and HG seem to have a hardware bug, by
105 * which ETXRDY interrupt is sometimes, say, once per few hours,
106 * lost; output stalls until next input arrives. In order to work
107 * around this problem, push TX queue manually by low-rate.
108 */
109 #define COM_EUMB_FLAG_BROKEN_ETXRDY __BIT(0)
110 if (device_cfdata(self)->cf_flags & COM_EUMB_FLAG_BROKEN_ETXRDY) {
111 SET(sc->sc_hwflags, COM_HW_BROKEN_ETXRDY);
112 sc->sc_poll_ticks = 10 * hz; /* once per 10 sec */
113 }
114
115 com_attach_subr(sc);
116
117 intr_establish_xname(epicirq + I8259_ICU, IST_LEVEL, IPL_SERIAL,
118 comintr, sc, device_xname(self));
119 aprint_normal_dev(self, "interrupting at irq %d\n",
120 epicirq + I8259_ICU);
121 }
122
123 int
eumbcnattach(bus_space_tag_t tag,int conaddr,int conspeed,int confreq,int contype,int conmode)124 eumbcnattach(bus_space_tag_t tag,
125 int conaddr, int conspeed, int confreq, int contype, int conmode)
126 {
127 static int attached = 0;
128 bus_space_handle_t dummy_bsh; /* XXX see com.c:comcnattach() */
129
130 memset(&dummy_bsh, 0, sizeof(dummy_bsh));
131
132 if (attached)
133 return 0;
134 attached = 1;
135
136 cnregs.cr_iot = tag;
137 cnregs.cr_iobase = conaddr;
138 cnregs.cr_nports = COM_NPORTS;
139 com_init_regs(&cnregs, tag, dummy_bsh, conaddr);
140 return comcnattach1(&cnregs, conspeed, confreq, contype, conmode);
141 }
142