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b5215db0 MF |
1 | /* Blackfin General Purpose Ports (GPIO) 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 "sim-main.h" | |
24 | #include "devices.h" | |
25 | #include "dv-bfin_gpio.h" | |
26 | ||
27 | struct bfin_gpio | |
28 | { | |
29 | bu32 base; | |
30 | ||
31 | /* Order after here is important -- matches hardware MMR layout. */ | |
32 | bu16 BFIN_MMR_16(data); | |
33 | bu16 BFIN_MMR_16(clear); | |
34 | bu16 BFIN_MMR_16(set); | |
35 | bu16 BFIN_MMR_16(toggle); | |
36 | bu16 BFIN_MMR_16(maska); | |
37 | bu16 BFIN_MMR_16(maska_clear); | |
38 | bu16 BFIN_MMR_16(maska_set); | |
39 | bu16 BFIN_MMR_16(maska_toggle); | |
40 | bu16 BFIN_MMR_16(maskb); | |
41 | bu16 BFIN_MMR_16(maskb_clear); | |
42 | bu16 BFIN_MMR_16(maskb_set); | |
43 | bu16 BFIN_MMR_16(maskb_toggle); | |
44 | bu16 BFIN_MMR_16(dir); | |
45 | bu16 BFIN_MMR_16(polar); | |
46 | bu16 BFIN_MMR_16(edge); | |
47 | bu16 BFIN_MMR_16(both); | |
48 | bu16 BFIN_MMR_16(inen); | |
49 | }; | |
50 | #define mmr_base() offsetof(struct bfin_gpio, data) | |
51 | #define mmr_offset(mmr) (offsetof(struct bfin_gpio, mmr) - mmr_base()) | |
52 | ||
53 | static const char * const mmr_names[] = | |
54 | { | |
55 | "PORTIO", "PORTIO_CLEAR", "PORTIO_SET", "PORTIO_TOGGLE", "PORTIO_MASKA", | |
56 | "PORTIO_MASKA_CLEAR", "PORTIO_MASKA_SET", "PORTIO_MASKA_TOGGLE", | |
57 | "PORTIO_MASKB", "PORTIO_MASKB_CLEAR", "PORTIO_MASKB_SET", | |
58 | "PORTIO_MASKB_TOGGLE", "PORTIO_DIR", "PORTIO_POLAR", "PORTIO_EDGE", | |
59 | "PORTIO_BOTH", "PORTIO_INEN", | |
60 | }; | |
61 | #define mmr_name(off) mmr_names[(off) / 4] | |
62 | ||
63 | static unsigned | |
64 | bfin_gpio_io_write_buffer (struct hw *me, const void *source, int space, | |
65 | address_word addr, unsigned nr_bytes) | |
66 | { | |
67 | struct bfin_gpio *port = hw_data (me); | |
68 | bu32 mmr_off; | |
69 | bu16 value; | |
70 | bu16 *valuep; | |
71 | ||
72 | value = dv_load_2 (source); | |
73 | mmr_off = addr - port->base; | |
74 | valuep = (void *)((unsigned long)port + mmr_base() + mmr_off); | |
75 | ||
76 | HW_TRACE_WRITE (); | |
77 | ||
78 | dv_bfin_mmr_require_16 (me, addr, nr_bytes, true); | |
79 | ||
80 | switch (mmr_off) | |
81 | { | |
82 | case mmr_offset(data): | |
83 | case mmr_offset(maska): | |
84 | case mmr_offset(maskb): | |
85 | case mmr_offset(dir): | |
86 | case mmr_offset(polar): | |
87 | case mmr_offset(edge): | |
88 | case mmr_offset(both): | |
89 | case mmr_offset(inen): | |
90 | *valuep = value; | |
91 | break; | |
92 | case mmr_offset(clear): | |
93 | case mmr_offset(maska_clear): | |
94 | case mmr_offset(maskb_clear): | |
eaf863cd MF |
95 | /* We want to clear the related data MMR. */ |
96 | valuep -= 2; | |
9922f803 | 97 | dv_w1c_2 (valuep, value, -1); |
b5215db0 MF |
98 | break; |
99 | case mmr_offset(set): | |
100 | case mmr_offset(maska_set): | |
101 | case mmr_offset(maskb_set): | |
eaf863cd MF |
102 | /* We want to set the related data MMR. */ |
103 | valuep -= 4; | |
b5215db0 MF |
104 | *valuep |= value; |
105 | break; | |
106 | case mmr_offset(toggle): | |
107 | case mmr_offset(maska_toggle): | |
108 | case mmr_offset(maskb_toggle): | |
eaf863cd MF |
109 | /* We want to toggle the related data MMR. */ |
110 | valuep -= 6; | |
b5215db0 MF |
111 | *valuep ^= value; |
112 | break; | |
113 | default: | |
114 | dv_bfin_mmr_invalid (me, addr, nr_bytes, true); | |
115 | break; | |
116 | } | |
117 | ||
118 | return nr_bytes; | |
119 | } | |
120 | ||
121 | static unsigned | |
122 | bfin_gpio_io_read_buffer (struct hw *me, void *dest, int space, | |
123 | address_word addr, unsigned nr_bytes) | |
124 | { | |
125 | struct bfin_gpio *port = hw_data (me); | |
126 | bu32 mmr_off; | |
127 | bu16 *valuep; | |
128 | ||
129 | mmr_off = addr - port->base; | |
130 | valuep = (void *)((unsigned long)port + mmr_base() + mmr_off); | |
131 | ||
132 | HW_TRACE_READ (); | |
133 | ||
134 | dv_bfin_mmr_require_16 (me, addr, nr_bytes, false); | |
135 | ||
136 | switch (mmr_off) | |
137 | { | |
138 | case mmr_offset(data): | |
139 | case mmr_offset(clear): | |
140 | case mmr_offset(set): | |
141 | case mmr_offset(toggle): | |
142 | dv_store_2 (dest, port->data); | |
143 | break; | |
144 | case mmr_offset(maska): | |
145 | case mmr_offset(maska_clear): | |
146 | case mmr_offset(maska_set): | |
147 | case mmr_offset(maska_toggle): | |
148 | dv_store_2 (dest, port->maska); | |
149 | break; | |
150 | case mmr_offset(maskb): | |
151 | case mmr_offset(maskb_clear): | |
152 | case mmr_offset(maskb_set): | |
153 | case mmr_offset(maskb_toggle): | |
154 | dv_store_2 (dest, port->maskb); | |
155 | break; | |
156 | case mmr_offset(dir): | |
157 | case mmr_offset(polar): | |
158 | case mmr_offset(edge): | |
159 | case mmr_offset(both): | |
160 | case mmr_offset(inen): | |
161 | dv_store_2 (dest, *valuep); | |
162 | break; | |
163 | default: | |
164 | dv_bfin_mmr_invalid (me, addr, nr_bytes, false); | |
165 | break; | |
166 | } | |
167 | ||
168 | return nr_bytes; | |
169 | } | |
170 | ||
171 | static const struct hw_port_descriptor bfin_gpio_ports[] = | |
172 | { | |
173 | { "mask_a", 0, 0, output_port, }, | |
174 | { "mask_b", 1, 0, output_port, }, | |
175 | { "p0", 0, 0, input_port, }, | |
176 | { "p1", 1, 0, input_port, }, | |
177 | { "p2", 2, 0, input_port, }, | |
178 | { "p3", 3, 0, input_port, }, | |
179 | { "p4", 4, 0, input_port, }, | |
180 | { "p5", 5, 0, input_port, }, | |
181 | { "p6", 6, 0, input_port, }, | |
182 | { "p7", 7, 0, input_port, }, | |
183 | { "p8", 8, 0, input_port, }, | |
184 | { "p9", 9, 0, input_port, }, | |
185 | { "p10", 10, 0, input_port, }, | |
186 | { "p11", 11, 0, input_port, }, | |
187 | { "p12", 12, 0, input_port, }, | |
188 | { "p13", 13, 0, input_port, }, | |
189 | { "p14", 14, 0, input_port, }, | |
190 | { NULL, 0, 0, 0, }, | |
191 | }; | |
192 | ||
193 | static void | |
194 | bfin_gpio_port_event (struct hw *me, int my_port, struct hw *source, | |
195 | int source_port, int level) | |
196 | { | |
197 | struct bfin_gpio *port = hw_data (me); | |
198 | bool olvl, nlvl; | |
199 | bu32 bit = (1 << my_port); | |
200 | ||
b72cc8e1 MF |
201 | /* Normalize the level value. A simulated device can send any value |
202 | it likes to us, but in reality we only care about 0 and 1. This | |
203 | lets us assume only those two values below. */ | |
204 | level = !!level; | |
205 | ||
206 | /* Only screw with state if this pin is set as an input, and the | |
207 | input is actually enabled. */ | |
208 | if ((port->dir & bit) || !(port->inen & bit)) | |
b5215db0 MF |
209 | return; |
210 | ||
211 | /* Get the old pin state for calculating an interrupt. */ | |
212 | olvl = !!(port->data & bit); | |
213 | ||
214 | /* Update the new pin state. */ | |
b72cc8e1 | 215 | port->data = (port->data & ~bit) | (level << my_port); |
b5215db0 MF |
216 | |
217 | /* See if this state transition will generate an interrupt. */ | |
218 | nlvl = !!(port->data & bit); | |
219 | ||
220 | if (port->edge & bit) | |
221 | { | |
222 | /* Pin is edge triggered. */ | |
b72cc8e1 | 223 | if (port->both & bit) |
b5215db0 MF |
224 | { |
225 | /* Both edges. */ | |
226 | if (olvl == nlvl) | |
227 | return; | |
228 | } | |
229 | else | |
230 | { | |
231 | /* Just one edge. */ | |
232 | if (!(((port->polar & bit) && olvl > nlvl) | |
233 | || (!(port->polar & bit) && olvl < nlvl))) | |
234 | return; | |
235 | } | |
236 | } | |
237 | else | |
238 | { | |
239 | /* Pin is level triggered. */ | |
240 | if (nlvl == !!(port->polar & bit)) | |
241 | return; | |
242 | } | |
243 | ||
244 | /* If the masks allow it, push the interrupt even higher. */ | |
245 | if (port->maska & bit) | |
246 | hw_port_event (me, 0, 1); | |
247 | if (port->maskb & bit) | |
248 | hw_port_event (me, 1, 1); | |
249 | } | |
250 | ||
251 | static void | |
252 | attach_bfin_gpio_regs (struct hw *me, struct bfin_gpio *port) | |
253 | { | |
254 | address_word attach_address; | |
255 | int attach_space; | |
256 | unsigned attach_size; | |
257 | reg_property_spec reg; | |
258 | ||
259 | if (hw_find_property (me, "reg") == NULL) | |
260 | hw_abort (me, "Missing \"reg\" property"); | |
261 | ||
262 | if (!hw_find_reg_array_property (me, "reg", 0, ®)) | |
263 | hw_abort (me, "\"reg\" property must contain three addr/size entries"); | |
264 | ||
265 | hw_unit_address_to_attach_address (hw_parent (me), | |
266 | ®.address, | |
267 | &attach_space, &attach_address, me); | |
268 | hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me); | |
269 | ||
270 | if (attach_size != BFIN_MMR_GPIO_SIZE) | |
271 | hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPIO_SIZE); | |
272 | ||
273 | hw_attach_address (hw_parent (me), | |
274 | 0, attach_space, attach_address, attach_size, me); | |
275 | ||
276 | port->base = attach_address; | |
277 | } | |
278 | ||
279 | static void | |
280 | bfin_gpio_finish (struct hw *me) | |
281 | { | |
282 | struct bfin_gpio *port; | |
283 | ||
284 | port = HW_ZALLOC (me, struct bfin_gpio); | |
285 | ||
286 | set_hw_data (me, port); | |
287 | set_hw_io_read_buffer (me, bfin_gpio_io_read_buffer); | |
288 | set_hw_io_write_buffer (me, bfin_gpio_io_write_buffer); | |
289 | set_hw_ports (me, bfin_gpio_ports); | |
290 | set_hw_port_event (me, bfin_gpio_port_event); | |
291 | ||
292 | attach_bfin_gpio_regs (me, port); | |
293 | } | |
294 | ||
295 | const struct hw_descriptor dv_bfin_gpio_descriptor[] = | |
296 | { | |
297 | {"bfin_gpio", bfin_gpio_finish,}, | |
298 | {NULL, NULL}, | |
299 | }; |