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ef016f83 MF |
1 | /* Blackfin Two Wire Interface (TWI) model |
2 | ||
618f726f | 3 | Copyright (C) 2010-2016 Free Software Foundation, Inc. |
ef016f83 MF |
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_twi.h" | |
26 | ||
27 | /* XXX: This is merely a stub. */ | |
28 | ||
29 | struct bfin_twi | |
30 | { | |
31 | /* This top portion matches common dv_bfin struct. */ | |
32 | bu32 base; | |
33 | struct hw *dma_master; | |
34 | bool acked; | |
35 | ||
36 | struct hw_event *handler; | |
37 | char saved_byte; | |
38 | int saved_count; | |
39 | ||
40 | bu16 xmt_fifo, rcv_fifo; | |
41 | ||
42 | /* Order after here is important -- matches hardware MMR layout. */ | |
43 | bu16 BFIN_MMR_16(clkdiv); | |
44 | bu16 BFIN_MMR_16(control); | |
45 | bu16 BFIN_MMR_16(slave_ctl); | |
46 | bu16 BFIN_MMR_16(slave_stat); | |
47 | bu16 BFIN_MMR_16(slave_addr); | |
48 | bu16 BFIN_MMR_16(master_ctl); | |
49 | bu16 BFIN_MMR_16(master_stat); | |
50 | bu16 BFIN_MMR_16(master_addr); | |
51 | bu16 BFIN_MMR_16(int_stat); | |
52 | bu16 BFIN_MMR_16(int_mask); | |
53 | bu16 BFIN_MMR_16(fifo_ctl); | |
54 | bu16 BFIN_MMR_16(fifo_stat); | |
55 | bu32 _pad0[20]; | |
56 | bu16 BFIN_MMR_16(xmt_data8); | |
57 | bu16 BFIN_MMR_16(xmt_data16); | |
58 | bu16 BFIN_MMR_16(rcv_data8); | |
59 | bu16 BFIN_MMR_16(rcv_data16); | |
60 | }; | |
61 | #define mmr_base() offsetof(struct bfin_twi, clkdiv) | |
62 | #define mmr_offset(mmr) (offsetof(struct bfin_twi, mmr) - mmr_base()) | |
63 | #define mmr_idx(mmr) (mmr_offset (mmr) / 4) | |
64 | ||
990d19fd MF |
65 | static const char * const mmr_names[] = |
66 | { | |
ef016f83 MF |
67 | "TWI_CLKDIV", "TWI_CONTROL", "TWI_SLAVE_CTL", "TWI_SLAVE_STAT", |
68 | "TWI_SLAVE_ADDR", "TWI_MASTER_CTL", "TWI_MASTER_STAT", "TWI_MASTER_ADDR", | |
69 | "TWI_INT_STAT", "TWI_INT_MASK", "TWI_FIFO_CTL", "TWI_FIFO_STAT", | |
70 | [mmr_idx (xmt_data8)] = "TWI_XMT_DATA8", "TWI_XMT_DATA16", "TWI_RCV_DATA8", | |
71 | "TWI_RCV_DATA16", | |
72 | }; | |
73 | #define mmr_name(off) (mmr_names[(off) / 4] ? : "<INV>") | |
74 | ||
75 | static unsigned | |
76 | bfin_twi_io_write_buffer (struct hw *me, const void *source, int space, | |
77 | address_word addr, unsigned nr_bytes) | |
78 | { | |
79 | struct bfin_twi *twi = hw_data (me); | |
80 | bu32 mmr_off; | |
81 | bu32 value; | |
82 | bu16 *valuep; | |
83 | ||
466b619e MF |
84 | /* Invalid access mode is higher priority than missing register. */ |
85 | if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true)) | |
86 | return 0; | |
87 | ||
ef016f83 MF |
88 | value = dv_load_2 (source); |
89 | mmr_off = addr - twi->base; | |
90 | valuep = (void *)((unsigned long)twi + mmr_base() + mmr_off); | |
91 | ||
92 | HW_TRACE_WRITE (); | |
93 | ||
ef016f83 MF |
94 | switch (mmr_off) |
95 | { | |
96 | case mmr_offset(clkdiv): | |
97 | case mmr_offset(control): | |
98 | case mmr_offset(slave_ctl): | |
99 | case mmr_offset(slave_addr): | |
100 | case mmr_offset(master_ctl): | |
101 | case mmr_offset(master_addr): | |
102 | case mmr_offset(int_mask): | |
103 | case mmr_offset(fifo_ctl): | |
104 | *valuep = value; | |
105 | break; | |
106 | case mmr_offset(int_stat): | |
9922f803 | 107 | dv_w1c_2 (valuep, value, -1); |
ef016f83 MF |
108 | break; |
109 | case mmr_offset(master_stat): | |
9922f803 | 110 | dv_w1c_2 (valuep, value, BUFWRERR | BUFRDERR | DNAK | ANAK | LOSTARB); |
ef016f83 MF |
111 | break; |
112 | case mmr_offset(slave_stat): | |
113 | case mmr_offset(fifo_stat): | |
114 | case mmr_offset(rcv_data8): | |
115 | case mmr_offset(rcv_data16): | |
116 | /* These are all RO. XXX: Does these throw error ? */ | |
117 | break; | |
118 | case mmr_offset(xmt_data8): | |
119 | value &= 0xff; | |
120 | case mmr_offset(xmt_data16): | |
121 | twi->xmt_fifo = value; | |
122 | break; | |
123 | default: | |
124 | dv_bfin_mmr_invalid (me, addr, nr_bytes, true); | |
466b619e | 125 | return 0; |
ef016f83 MF |
126 | } |
127 | ||
128 | return nr_bytes; | |
129 | } | |
130 | ||
131 | static unsigned | |
132 | bfin_twi_io_read_buffer (struct hw *me, void *dest, int space, | |
133 | address_word addr, unsigned nr_bytes) | |
134 | { | |
135 | struct bfin_twi *twi = hw_data (me); | |
136 | bu32 mmr_off; | |
137 | bu16 *valuep; | |
138 | ||
466b619e MF |
139 | /* Invalid access mode is higher priority than missing register. */ |
140 | if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false)) | |
141 | return 0; | |
142 | ||
ef016f83 MF |
143 | mmr_off = addr - twi->base; |
144 | valuep = (void *)((unsigned long)twi + mmr_base() + mmr_off); | |
145 | ||
146 | HW_TRACE_READ (); | |
147 | ||
ef016f83 MF |
148 | switch (mmr_off) |
149 | { | |
150 | case mmr_offset(clkdiv): | |
151 | case mmr_offset(control): | |
152 | case mmr_offset(slave_ctl): | |
153 | case mmr_offset(slave_stat): | |
154 | case mmr_offset(slave_addr): | |
155 | case mmr_offset(master_ctl): | |
156 | case mmr_offset(master_stat): | |
157 | case mmr_offset(master_addr): | |
158 | case mmr_offset(int_stat): | |
159 | case mmr_offset(int_mask): | |
160 | case mmr_offset(fifo_ctl): | |
161 | case mmr_offset(fifo_stat): | |
162 | dv_store_2 (dest, *valuep); | |
163 | break; | |
164 | case mmr_offset(rcv_data8): | |
165 | case mmr_offset(rcv_data16): | |
166 | dv_store_2 (dest, twi->rcv_fifo); | |
167 | break; | |
168 | case mmr_offset(xmt_data8): | |
169 | case mmr_offset(xmt_data16): | |
170 | /* These always read as 0. */ | |
171 | dv_store_2 (dest, 0); | |
172 | break; | |
173 | default: | |
174 | dv_bfin_mmr_invalid (me, addr, nr_bytes, false); | |
466b619e | 175 | return 0; |
ef016f83 MF |
176 | } |
177 | ||
178 | return nr_bytes; | |
179 | } | |
180 | ||
990d19fd MF |
181 | static const struct hw_port_descriptor bfin_twi_ports[] = |
182 | { | |
ef016f83 MF |
183 | { "stat", 0, 0, output_port, }, |
184 | { NULL, 0, 0, 0, }, | |
185 | }; | |
186 | ||
187 | static void | |
188 | attach_bfin_twi_regs (struct hw *me, struct bfin_twi *twi) | |
189 | { | |
190 | address_word attach_address; | |
191 | int attach_space; | |
192 | unsigned attach_size; | |
193 | reg_property_spec reg; | |
194 | ||
195 | if (hw_find_property (me, "reg") == NULL) | |
196 | hw_abort (me, "Missing \"reg\" property"); | |
197 | ||
198 | if (!hw_find_reg_array_property (me, "reg", 0, ®)) | |
199 | hw_abort (me, "\"reg\" property must contain three addr/size entries"); | |
200 | ||
201 | hw_unit_address_to_attach_address (hw_parent (me), | |
202 | ®.address, | |
203 | &attach_space, &attach_address, me); | |
204 | hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me); | |
205 | ||
206 | if (attach_size != BFIN_MMR_TWI_SIZE) | |
207 | hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_TWI_SIZE); | |
208 | ||
209 | hw_attach_address (hw_parent (me), | |
210 | 0, attach_space, attach_address, attach_size, me); | |
211 | ||
212 | twi->base = attach_address; | |
213 | } | |
214 | ||
215 | static void | |
216 | bfin_twi_finish (struct hw *me) | |
217 | { | |
218 | struct bfin_twi *twi; | |
219 | ||
220 | twi = HW_ZALLOC (me, struct bfin_twi); | |
221 | ||
222 | set_hw_data (me, twi); | |
223 | set_hw_io_read_buffer (me, bfin_twi_io_read_buffer); | |
224 | set_hw_io_write_buffer (me, bfin_twi_io_write_buffer); | |
225 | set_hw_ports (me, bfin_twi_ports); | |
226 | ||
227 | attach_bfin_twi_regs (me, twi); | |
228 | } | |
229 | ||
81d126c3 MF |
230 | const struct hw_descriptor dv_bfin_twi_descriptor[] = |
231 | { | |
ef016f83 MF |
232 | {"bfin_twi", bfin_twi_finish,}, |
233 | {NULL, NULL}, | |
234 | }; |