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Commit | Line | Data |
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40b6f911 PC |
1 | /* |
2 | * IMX31 UARTS | |
3 | * | |
4 | * Copyright (c) 2008 OKL | |
5 | * Originally Written by Hans Jiang | |
6 | * Copyright (c) 2011 NICTA Pty Ltd. | |
cd0bda20 | 7 | * Updated by Jean-Christophe Dubois <jcd@tribudubois.net> |
40b6f911 PC |
8 | * |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
10 | * See the COPYING file in the top-level directory. | |
11 | * | |
12 | * This is a `bare-bones' implementation of the IMX series serial ports. | |
13 | * TODO: | |
14 | * -- implement FIFOs. The real hardware has 32 word transmit | |
15 | * and receive FIFOs; we currently use a 1-char buffer | |
16 | * -- implement DMA | |
17 | * -- implement BAUD-rate and modem lines, for when the backend | |
18 | * is a real serial device. | |
19 | */ | |
20 | ||
8ef94f0b | 21 | #include "qemu/osdep.h" |
cd0bda20 | 22 | #include "hw/char/imx_serial.h" |
64552b6b | 23 | #include "hw/irq.h" |
9c17d615 | 24 | #include "sysemu/sysemu.h" |
03dd024f | 25 | #include "qemu/log.h" |
0b8fa32f | 26 | #include "qemu/module.h" |
40b6f911 | 27 | |
8ccce77c JCD |
28 | #ifndef DEBUG_IMX_UART |
29 | #define DEBUG_IMX_UART 0 | |
40b6f911 PC |
30 | #endif |
31 | ||
8ccce77c JCD |
32 | #define DPRINTF(fmt, args...) \ |
33 | do { \ | |
34 | if (DEBUG_IMX_UART) { \ | |
35 | fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX_SERIAL, \ | |
36 | __func__, ##args); \ | |
37 | } \ | |
38 | } while (0) | |
40b6f911 | 39 | |
40b6f911 | 40 | static const VMStateDescription vmstate_imx_serial = { |
fa2650a3 | 41 | .name = TYPE_IMX_SERIAL, |
46d3fb63 AS |
42 | .version_id = 2, |
43 | .minimum_version_id = 2, | |
40b6f911 PC |
44 | .fields = (VMStateField[]) { |
45 | VMSTATE_INT32(readbuff, IMXSerialState), | |
46 | VMSTATE_UINT32(usr1, IMXSerialState), | |
47 | VMSTATE_UINT32(usr2, IMXSerialState), | |
48 | VMSTATE_UINT32(ucr1, IMXSerialState), | |
49 | VMSTATE_UINT32(uts1, IMXSerialState), | |
50 | VMSTATE_UINT32(onems, IMXSerialState), | |
51 | VMSTATE_UINT32(ufcr, IMXSerialState), | |
52 | VMSTATE_UINT32(ubmr, IMXSerialState), | |
53 | VMSTATE_UINT32(ubrc, IMXSerialState), | |
54 | VMSTATE_UINT32(ucr3, IMXSerialState), | |
46d3fb63 | 55 | VMSTATE_UINT32(ucr4, IMXSerialState), |
40b6f911 PC |
56 | VMSTATE_END_OF_LIST() |
57 | }, | |
58 | }; | |
59 | ||
40b6f911 PC |
60 | static void imx_update(IMXSerialState *s) |
61 | { | |
824e4a12 AS |
62 | uint32_t usr1; |
63 | uint32_t usr2; | |
64 | uint32_t mask; | |
40b6f911 | 65 | |
824e4a12 AS |
66 | /* |
67 | * Lucky for us TRDY and RRDY has the same offset in both USR1 and | |
68 | * UCR1, so we can get away with something as simple as the | |
69 | * following: | |
70 | */ | |
71 | usr1 = s->usr1 & s->ucr1 & (USR1_TRDY | USR1_RRDY); | |
72 | /* | |
73 | * Bits that we want in USR2 are not as conveniently laid out, | |
74 | * unfortunately. | |
75 | */ | |
76 | mask = (s->ucr1 & UCR1_TXMPTYEN) ? USR2_TXFE : 0; | |
46d3fb63 AS |
77 | /* |
78 | * TCEN and TXDC are both bit 3 | |
3c54cf77 | 79 | * RDR and DREN are both bit 0 |
46d3fb63 | 80 | */ |
3c54cf77 | 81 | mask |= s->ucr4 & (UCR4_TCEN | UCR4_DREN); |
46d3fb63 | 82 | |
824e4a12 | 83 | usr2 = s->usr2 & mask; |
40b6f911 | 84 | |
824e4a12 | 85 | qemu_set_irq(s->irq, usr1 || usr2); |
40b6f911 PC |
86 | } |
87 | ||
88 | static void imx_serial_reset(IMXSerialState *s) | |
89 | { | |
90 | ||
91 | s->usr1 = USR1_TRDY | USR1_RXDS; | |
92 | /* | |
93 | * Fake attachment of a terminal: assert RTS. | |
94 | */ | |
95 | s->usr1 |= USR1_RTSS; | |
96 | s->usr2 = USR2_TXFE | USR2_TXDC | USR2_DCDIN; | |
97 | s->uts1 = UTS1_RXEMPTY | UTS1_TXEMPTY; | |
98 | s->ucr1 = 0; | |
99 | s->ucr2 = UCR2_SRST; | |
100 | s->ucr3 = 0x700; | |
101 | s->ubmr = 0; | |
102 | s->ubrc = 4; | |
103 | s->readbuff = URXD_ERR; | |
104 | } | |
105 | ||
106 | static void imx_serial_reset_at_boot(DeviceState *dev) | |
107 | { | |
8d8e3481 | 108 | IMXSerialState *s = IMX_SERIAL(dev); |
40b6f911 PC |
109 | |
110 | imx_serial_reset(s); | |
111 | ||
112 | /* | |
113 | * enable the uart on boot, so messages from the linux decompresser | |
114 | * are visible. On real hardware this is done by the boot rom | |
115 | * before anything else is loaded. | |
116 | */ | |
117 | s->ucr1 = UCR1_UARTEN; | |
118 | s->ucr2 = UCR2_TXEN; | |
119 | ||
120 | } | |
121 | ||
a8170e5e | 122 | static uint64_t imx_serial_read(void *opaque, hwaddr offset, |
40b6f911 PC |
123 | unsigned size) |
124 | { | |
125 | IMXSerialState *s = (IMXSerialState *)opaque; | |
126 | uint32_t c; | |
127 | ||
8ccce77c JCD |
128 | DPRINTF("read(offset=0x%" HWADDR_PRIx ")\n", offset); |
129 | ||
40b6f911 PC |
130 | switch (offset >> 2) { |
131 | case 0x0: /* URXD */ | |
132 | c = s->readbuff; | |
133 | if (!(s->uts1 & UTS1_RXEMPTY)) { | |
134 | /* Character is valid */ | |
135 | c |= URXD_CHARRDY; | |
136 | s->usr1 &= ~USR1_RRDY; | |
137 | s->usr2 &= ~USR2_RDR; | |
138 | s->uts1 |= UTS1_RXEMPTY; | |
139 | imx_update(s); | |
fa394ed6 | 140 | qemu_chr_fe_accept_input(&s->chr); |
40b6f911 PC |
141 | } |
142 | return c; | |
143 | ||
144 | case 0x20: /* UCR1 */ | |
145 | return s->ucr1; | |
146 | ||
147 | case 0x21: /* UCR2 */ | |
148 | return s->ucr2; | |
149 | ||
150 | case 0x25: /* USR1 */ | |
151 | return s->usr1; | |
152 | ||
153 | case 0x26: /* USR2 */ | |
154 | return s->usr2; | |
155 | ||
156 | case 0x2A: /* BRM Modulator */ | |
157 | return s->ubmr; | |
158 | ||
159 | case 0x2B: /* Baud Rate Count */ | |
160 | return s->ubrc; | |
161 | ||
162 | case 0x2d: /* Test register */ | |
163 | return s->uts1; | |
164 | ||
165 | case 0x24: /* UFCR */ | |
166 | return s->ufcr; | |
167 | ||
168 | case 0x2c: | |
169 | return s->onems; | |
170 | ||
171 | case 0x22: /* UCR3 */ | |
172 | return s->ucr3; | |
173 | ||
174 | case 0x23: /* UCR4 */ | |
46d3fb63 AS |
175 | return s->ucr4; |
176 | ||
40b6f911 PC |
177 | case 0x29: /* BRM Incremental */ |
178 | return 0x0; /* TODO */ | |
179 | ||
180 | default: | |
8ccce77c JCD |
181 | qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%" |
182 | HWADDR_PRIx "\n", TYPE_IMX_SERIAL, __func__, offset); | |
40b6f911 PC |
183 | return 0; |
184 | } | |
185 | } | |
186 | ||
a8170e5e | 187 | static void imx_serial_write(void *opaque, hwaddr offset, |
fa2650a3 | 188 | uint64_t value, unsigned size) |
40b6f911 PC |
189 | { |
190 | IMXSerialState *s = (IMXSerialState *)opaque; | |
0ec7b3e7 | 191 | Chardev *chr = qemu_chr_fe_get_driver(&s->chr); |
40b6f911 PC |
192 | unsigned char ch; |
193 | ||
8ccce77c | 194 | DPRINTF("write(offset=0x%" HWADDR_PRIx ", value = 0x%x) to %s\n", |
5345fdb4 | 195 | offset, (unsigned int)value, chr ? chr->label : "NODEV"); |
40b6f911 PC |
196 | |
197 | switch (offset >> 2) { | |
198 | case 0x10: /* UTXD */ | |
199 | ch = value; | |
200 | if (s->ucr2 & UCR2_TXEN) { | |
fa394ed6 MAL |
201 | /* XXX this blocks entire thread. Rewrite to use |
202 | * qemu_chr_fe_write and background I/O callbacks */ | |
203 | qemu_chr_fe_write_all(&s->chr, &ch, 1); | |
40b6f911 | 204 | s->usr1 &= ~USR1_TRDY; |
46d3fb63 | 205 | s->usr2 &= ~USR2_TXDC; |
40b6f911 PC |
206 | imx_update(s); |
207 | s->usr1 |= USR1_TRDY; | |
46d3fb63 | 208 | s->usr2 |= USR2_TXDC; |
40b6f911 PC |
209 | imx_update(s); |
210 | } | |
211 | break; | |
212 | ||
213 | case 0x20: /* UCR1 */ | |
214 | s->ucr1 = value & 0xffff; | |
8ccce77c | 215 | |
40b6f911 | 216 | DPRINTF("write(ucr1=%x)\n", (unsigned int)value); |
8ccce77c | 217 | |
40b6f911 PC |
218 | imx_update(s); |
219 | break; | |
220 | ||
221 | case 0x21: /* UCR2 */ | |
222 | /* | |
223 | * Only a few bits in control register 2 are implemented as yet. | |
224 | * If it's intended to use a real serial device as a back-end, this | |
225 | * register will have to be implemented more fully. | |
226 | */ | |
227 | if (!(value & UCR2_SRST)) { | |
228 | imx_serial_reset(s); | |
229 | imx_update(s); | |
230 | value |= UCR2_SRST; | |
231 | } | |
232 | if (value & UCR2_RXEN) { | |
233 | if (!(s->ucr2 & UCR2_RXEN)) { | |
fa394ed6 | 234 | qemu_chr_fe_accept_input(&s->chr); |
40b6f911 PC |
235 | } |
236 | } | |
237 | s->ucr2 = value & 0xffff; | |
238 | break; | |
239 | ||
240 | case 0x25: /* USR1 */ | |
241 | value &= USR1_AWAKE | USR1_AIRINT | USR1_DTRD | USR1_AGTIM | | |
fa2650a3 | 242 | USR1_FRAMERR | USR1_ESCF | USR1_RTSD | USR1_PARTYER; |
40b6f911 PC |
243 | s->usr1 &= ~value; |
244 | break; | |
245 | ||
246 | case 0x26: /* USR2 */ | |
fa2650a3 JCD |
247 | /* |
248 | * Writing 1 to some bits clears them; all other | |
249 | * values are ignored | |
250 | */ | |
40b6f911 | 251 | value &= USR2_ADET | USR2_DTRF | USR2_IDLE | USR2_ACST | |
fa2650a3 JCD |
252 | USR2_RIDELT | USR2_IRINT | USR2_WAKE | |
253 | USR2_DCDDELT | USR2_RTSF | USR2_BRCD | USR2_ORE; | |
40b6f911 PC |
254 | s->usr2 &= ~value; |
255 | break; | |
256 | ||
fa2650a3 JCD |
257 | /* |
258 | * Linux expects to see what it writes to these registers | |
259 | * We don't currently alter the baud rate | |
260 | */ | |
40b6f911 PC |
261 | case 0x29: /* UBIR */ |
262 | s->ubrc = value & 0xffff; | |
263 | break; | |
264 | ||
265 | case 0x2a: /* UBMR */ | |
266 | s->ubmr = value & 0xffff; | |
267 | break; | |
268 | ||
269 | case 0x2c: /* One ms reg */ | |
270 | s->onems = value & 0xffff; | |
271 | break; | |
272 | ||
273 | case 0x24: /* FIFO control register */ | |
274 | s->ufcr = value & 0xffff; | |
275 | break; | |
276 | ||
277 | case 0x22: /* UCR3 */ | |
278 | s->ucr3 = value & 0xffff; | |
279 | break; | |
280 | ||
40b6f911 | 281 | case 0x23: /* UCR4 */ |
46d3fb63 AS |
282 | s->ucr4 = value & 0xffff; |
283 | imx_update(s); | |
284 | break; | |
285 | ||
286 | case 0x2d: /* UTS1 */ | |
8ccce77c JCD |
287 | qemu_log_mask(LOG_UNIMP, "[%s]%s: Unimplemented reg 0x%" |
288 | HWADDR_PRIx "\n", TYPE_IMX_SERIAL, __func__, offset); | |
40b6f911 PC |
289 | /* TODO */ |
290 | break; | |
291 | ||
292 | default: | |
8ccce77c JCD |
293 | qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%" |
294 | HWADDR_PRIx "\n", TYPE_IMX_SERIAL, __func__, offset); | |
40b6f911 PC |
295 | } |
296 | } | |
297 | ||
298 | static int imx_can_receive(void *opaque) | |
299 | { | |
300 | IMXSerialState *s = (IMXSerialState *)opaque; | |
301 | return !(s->usr1 & USR1_RRDY); | |
302 | } | |
303 | ||
304 | static void imx_put_data(void *opaque, uint32_t value) | |
305 | { | |
306 | IMXSerialState *s = (IMXSerialState *)opaque; | |
8ccce77c | 307 | |
40b6f911 | 308 | DPRINTF("received char\n"); |
8ccce77c | 309 | |
40b6f911 PC |
310 | s->usr1 |= USR1_RRDY; |
311 | s->usr2 |= USR2_RDR; | |
312 | s->uts1 &= ~UTS1_RXEMPTY; | |
313 | s->readbuff = value; | |
478a573a TP |
314 | if (value & URXD_BRK) { |
315 | s->usr2 |= USR2_BRCD; | |
316 | } | |
40b6f911 PC |
317 | imx_update(s); |
318 | } | |
319 | ||
320 | static void imx_receive(void *opaque, const uint8_t *buf, int size) | |
321 | { | |
322 | imx_put_data(opaque, *buf); | |
323 | } | |
324 | ||
325 | static void imx_event(void *opaque, int event) | |
326 | { | |
327 | if (event == CHR_EVENT_BREAK) { | |
478a573a | 328 | imx_put_data(opaque, URXD_BRK | URXD_FRMERR | URXD_ERR); |
40b6f911 PC |
329 | } |
330 | } | |
331 | ||
332 | ||
333 | static const struct MemoryRegionOps imx_serial_ops = { | |
334 | .read = imx_serial_read, | |
335 | .write = imx_serial_write, | |
336 | .endianness = DEVICE_NATIVE_ENDIAN, | |
337 | }; | |
338 | ||
f6c64000 | 339 | static void imx_serial_realize(DeviceState *dev, Error **errp) |
40b6f911 | 340 | { |
8d8e3481 | 341 | IMXSerialState *s = IMX_SERIAL(dev); |
40b6f911 | 342 | |
fa394ed6 MAL |
343 | DPRINTF("char dev for uart: %p\n", qemu_chr_fe_get_driver(&s->chr)); |
344 | ||
345 | qemu_chr_fe_set_handlers(&s->chr, imx_can_receive, imx_receive, | |
81517ba3 | 346 | imx_event, NULL, s, NULL, true); |
f6c64000 JCD |
347 | } |
348 | ||
349 | static void imx_serial_init(Object *obj) | |
350 | { | |
351 | SysBusDevice *sbd = SYS_BUS_DEVICE(obj); | |
352 | IMXSerialState *s = IMX_SERIAL(obj); | |
40b6f911 | 353 | |
f6c64000 JCD |
354 | memory_region_init_io(&s->iomem, obj, &imx_serial_ops, s, |
355 | TYPE_IMX_SERIAL, 0x1000); | |
356 | sysbus_init_mmio(sbd, &s->iomem); | |
357 | sysbus_init_irq(sbd, &s->irq); | |
40b6f911 PC |
358 | } |
359 | ||
f6c64000 | 360 | static Property imx_serial_properties[] = { |
40b6f911 PC |
361 | DEFINE_PROP_CHR("chardev", IMXSerialState, chr), |
362 | DEFINE_PROP_END_OF_LIST(), | |
363 | }; | |
364 | ||
365 | static void imx_serial_class_init(ObjectClass *klass, void *data) | |
366 | { | |
367 | DeviceClass *dc = DEVICE_CLASS(klass); | |
40b6f911 | 368 | |
f6c64000 | 369 | dc->realize = imx_serial_realize; |
40b6f911 PC |
370 | dc->vmsd = &vmstate_imx_serial; |
371 | dc->reset = imx_serial_reset_at_boot; | |
125ee0ed | 372 | set_bit(DEVICE_CATEGORY_INPUT, dc->categories); |
40b6f911 | 373 | dc->desc = "i.MX series UART"; |
f6c64000 | 374 | dc->props = imx_serial_properties; |
40b6f911 PC |
375 | } |
376 | ||
8c43a6f0 | 377 | static const TypeInfo imx_serial_info = { |
f6c64000 JCD |
378 | .name = TYPE_IMX_SERIAL, |
379 | .parent = TYPE_SYS_BUS_DEVICE, | |
380 | .instance_size = sizeof(IMXSerialState), | |
381 | .instance_init = imx_serial_init, | |
382 | .class_init = imx_serial_class_init, | |
40b6f911 PC |
383 | }; |
384 | ||
385 | static void imx_serial_register_types(void) | |
386 | { | |
387 | type_register_static(&imx_serial_info); | |
388 | } | |
389 | ||
390 | type_init(imx_serial_register_types) |