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ef016f83 MF |
1 | /* Blackfin Real Time Clock (RTC) model. |
2 | ||
3 | Copyright (C) 2010-2011 Free Software Foundation, Inc. | |
4 | Contributed by Analog Devices, Inc. | |
5 | ||
6 | This file is part of simulators. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | ||
23 | #include <time.h> | |
24 | #include "sim-main.h" | |
25 | #include "dv-sockser.h" | |
26 | #include "devices.h" | |
27 | #include "dv-bfin_rtc.h" | |
28 | ||
29 | /* XXX: This read-only stub setup is based on host system clock. */ | |
30 | ||
31 | struct bfin_rtc | |
32 | { | |
33 | bu32 base; | |
34 | bu32 stat_shadow; | |
35 | ||
36 | /* Order after here is important -- matches hardware MMR layout. */ | |
37 | bu32 stat; | |
38 | bu16 BFIN_MMR_16(ictl); | |
39 | bu16 BFIN_MMR_16(istat); | |
40 | bu16 BFIN_MMR_16(swcnt); | |
41 | bu32 alarm; | |
42 | bu16 BFIN_MMR_16(pren); | |
43 | }; | |
44 | #define mmr_base() offsetof(struct bfin_rtc, stat) | |
45 | #define mmr_offset(mmr) (offsetof(struct bfin_rtc, mmr) - mmr_base()) | |
46 | ||
990d19fd MF |
47 | static const char * const mmr_names[] = |
48 | { | |
ef016f83 MF |
49 | "RTC_STAT", "RTC_ICTL", "RTC_ISTAT", "RTC_SWCNT", "RTC_ALARM", "RTC_PREN", |
50 | }; | |
51 | #define mmr_name(off) mmr_names[(off) / 4] | |
52 | ||
53 | static unsigned | |
54 | bfin_rtc_io_write_buffer (struct hw *me, const void *source, | |
55 | int space, address_word addr, unsigned nr_bytes) | |
56 | { | |
57 | struct bfin_rtc *rtc = hw_data (me); | |
58 | bu32 mmr_off; | |
59 | bu32 value; | |
60 | bu16 *value16p; | |
61 | bu32 *value32p; | |
62 | void *valuep; | |
63 | ||
64 | if (nr_bytes == 4) | |
65 | value = dv_load_4 (source); | |
66 | else | |
67 | value = dv_load_2 (source); | |
68 | ||
69 | mmr_off = addr - rtc->base; | |
70 | valuep = (void *)((unsigned long)rtc + mmr_base() + mmr_off); | |
71 | value16p = valuep; | |
72 | value32p = valuep; | |
73 | ||
74 | HW_TRACE_WRITE (); | |
75 | ||
76 | /* XXX: These probably need more work. */ | |
77 | switch (mmr_off) | |
78 | { | |
79 | case mmr_offset(stat): | |
80 | /* XXX: Ignore these since we are wired to host. */ | |
81 | break; | |
82 | case mmr_offset(istat): | |
9922f803 | 83 | dv_w1c_2 (value16p, value, ~(1 << 14)); |
ef016f83 MF |
84 | break; |
85 | case mmr_offset(alarm): | |
86 | break; | |
87 | case mmr_offset(ictl): | |
88 | /* XXX: This should schedule an event handler. */ | |
89 | case mmr_offset(swcnt): | |
90 | case mmr_offset(pren): | |
91 | break; | |
92 | } | |
93 | ||
94 | return nr_bytes; | |
95 | } | |
96 | ||
97 | static unsigned | |
98 | bfin_rtc_io_read_buffer (struct hw *me, void *dest, | |
99 | int space, address_word addr, unsigned nr_bytes) | |
100 | { | |
101 | struct bfin_rtc *rtc = hw_data (me); | |
102 | bu32 mmr_off; | |
103 | bu16 *value16p; | |
104 | bu32 *value32p; | |
105 | void *valuep; | |
106 | ||
107 | mmr_off = addr - rtc->base; | |
108 | valuep = (void *)((unsigned long)rtc + mmr_base() + mmr_off); | |
109 | value16p = valuep; | |
110 | value32p = valuep; | |
111 | ||
112 | HW_TRACE_READ (); | |
113 | ||
114 | switch (mmr_off) | |
115 | { | |
116 | case mmr_offset(stat): | |
117 | { | |
118 | time_t t = time (NULL); | |
119 | struct tm *tm = localtime (&t); | |
120 | bu32 value = | |
121 | (((tm->tm_year - 70) * 365 + tm->tm_yday) << 17) | | |
122 | (tm->tm_hour << 12) | | |
123 | (tm->tm_min << 6) | | |
124 | (tm->tm_sec << 0); | |
125 | dv_store_4 (dest, value); | |
126 | break; | |
127 | } | |
128 | case mmr_offset(alarm): | |
129 | dv_store_4 (dest, *value32p); | |
130 | break; | |
131 | case mmr_offset(istat): | |
132 | case mmr_offset(ictl): | |
133 | case mmr_offset(swcnt): | |
134 | case mmr_offset(pren): | |
135 | dv_store_2 (dest, *value16p); | |
136 | break; | |
137 | } | |
138 | ||
139 | return nr_bytes; | |
140 | } | |
141 | ||
990d19fd MF |
142 | static const struct hw_port_descriptor bfin_rtc_ports[] = |
143 | { | |
ef016f83 MF |
144 | { "rtc", 0, 0, output_port, }, |
145 | { NULL, 0, 0, 0, }, | |
146 | }; | |
147 | ||
148 | static void | |
149 | attach_bfin_rtc_regs (struct hw *me, struct bfin_rtc *rtc) | |
150 | { | |
151 | address_word attach_address; | |
152 | int attach_space; | |
153 | unsigned attach_size; | |
154 | reg_property_spec reg; | |
155 | ||
156 | if (hw_find_property (me, "reg") == NULL) | |
157 | hw_abort (me, "Missing \"reg\" property"); | |
158 | ||
159 | if (!hw_find_reg_array_property (me, "reg", 0, ®)) | |
160 | hw_abort (me, "\"reg\" property must contain three addr/size entries"); | |
161 | ||
162 | hw_unit_address_to_attach_address (hw_parent (me), | |
163 | ®.address, | |
164 | &attach_space, &attach_address, me); | |
165 | hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me); | |
166 | ||
167 | if (attach_size != BFIN_MMR_RTC_SIZE) | |
168 | hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_RTC_SIZE); | |
169 | ||
170 | hw_attach_address (hw_parent (me), | |
171 | 0, attach_space, attach_address, attach_size, me); | |
172 | ||
173 | rtc->base = attach_address; | |
174 | } | |
175 | ||
176 | static void | |
177 | bfin_rtc_finish (struct hw *me) | |
178 | { | |
179 | struct bfin_rtc *rtc; | |
180 | ||
181 | rtc = HW_ZALLOC (me, struct bfin_rtc); | |
182 | ||
183 | set_hw_data (me, rtc); | |
184 | set_hw_io_read_buffer (me, bfin_rtc_io_read_buffer); | |
185 | set_hw_io_write_buffer (me, bfin_rtc_io_write_buffer); | |
186 | set_hw_ports (me, bfin_rtc_ports); | |
187 | ||
188 | attach_bfin_rtc_regs (me, rtc); | |
189 | ||
190 | /* Initialize the RTC. */ | |
191 | } | |
192 | ||
81d126c3 MF |
193 | const struct hw_descriptor dv_bfin_rtc_descriptor[] = |
194 | { | |
ef016f83 MF |
195 | {"bfin_rtc", bfin_rtc_finish,}, |
196 | {NULL, NULL}, | |
197 | }; |