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27#include "qemu/osdep.h"
28#include "qemu-common.h"
29#include "qemu/log.h"
30#include "cpu.h"
31#include "hw/hw.h"
32#include "hw/i2c/ppc4xx_i2c.h"
33#include "bitbang_i2c.h"
34
35#define PPC4xx_I2C_MEM_SIZE 18
36
37enum {
38 IIC_MDBUF = 0,
39
40 IIC_LMADR = 4,
41 IIC_HMADR,
42 IIC_CNTL,
43 IIC_MDCNTL,
44 IIC_STS,
45 IIC_EXTSTS,
46 IIC_LSADR,
47 IIC_HSADR,
48 IIC_CLKDIV,
49 IIC_INTRMSK,
50 IIC_XFRCNT,
51 IIC_XTCNTLSS,
52 IIC_DIRECTCNTL
53
54};
55
56#define IIC_CNTL_PT (1 << 0)
57#define IIC_CNTL_READ (1 << 1)
58#define IIC_CNTL_CHT (1 << 2)
59#define IIC_CNTL_RPST (1 << 3)
60#define IIC_CNTL_AMD (1 << 6)
61#define IIC_CNTL_HMT (1 << 7)
62
63#define IIC_MDCNTL_EINT (1 << 2)
64#define IIC_MDCNTL_ESM (1 << 3)
65#define IIC_MDCNTL_FMDB (1 << 6)
66
67#define IIC_STS_PT (1 << 0)
68#define IIC_STS_IRQA (1 << 1)
69#define IIC_STS_ERR (1 << 2)
70#define IIC_STS_MDBF (1 << 4)
71#define IIC_STS_MDBS (1 << 5)
72
73#define IIC_EXTSTS_XFRA (1 << 0)
74#define IIC_EXTSTS_BCS_FREE (4 << 4)
75#define IIC_EXTSTS_BCS_BUSY (5 << 4)
76
77#define IIC_INTRMSK_EIMTC (1 << 0)
78#define IIC_INTRMSK_EITA (1 << 1)
79#define IIC_INTRMSK_EIIC (1 << 2)
80#define IIC_INTRMSK_EIHE (1 << 3)
81
82#define IIC_XTCNTLSS_SRST (1 << 0)
83
84#define IIC_DIRECTCNTL_SDAC (1 << 3)
85#define IIC_DIRECTCNTL_SCLC (1 << 2)
86#define IIC_DIRECTCNTL_MSDA (1 << 1)
87#define IIC_DIRECTCNTL_MSCL (1 << 0)
88
89static void ppc4xx_i2c_reset(DeviceState *s)
90{
91 PPC4xxI2CState *i2c = PPC4xx_I2C(s);
92
93 i2c->mdidx = -1;
94 memset(i2c->mdata, 0, ARRAY_SIZE(i2c->mdata));
95
96 i2c->cntl = 0;
97 i2c->mdcntl = 0;
98 i2c->sts = 0;
99 i2c->extsts = IIC_EXTSTS_BCS_FREE;
100 i2c->clkdiv = 0;
101 i2c->intrmsk = 0;
102 i2c->xfrcnt = 0;
103 i2c->xtcntlss = 0;
104 i2c->directcntl = 0xf;
105}
106
107static uint64_t ppc4xx_i2c_readb(void *opaque, hwaddr addr, unsigned int size)
108{
109 PPC4xxI2CState *i2c = PPC4xx_I2C(opaque);
110 uint64_t ret;
111 int i;
112
113 switch (addr) {
114 case IIC_MDBUF:
115 if (i2c->mdidx < 0) {
116 ret = 0xff;
117 break;
118 }
119 ret = i2c->mdata[0];
120 if (i2c->mdidx == 3) {
121 i2c->sts &= ~IIC_STS_MDBF;
122 } else if (i2c->mdidx == 0) {
123 i2c->sts &= ~IIC_STS_MDBS;
124 }
125 for (i = 0; i < i2c->mdidx; i++) {
126 i2c->mdata[i] = i2c->mdata[i + 1];
127 }
128 if (i2c->mdidx >= 0) {
129 i2c->mdidx--;
130 }
131 break;
132 case IIC_LMADR:
133 ret = i2c->lmadr;
134 break;
135 case IIC_HMADR:
136 ret = i2c->hmadr;
137 break;
138 case IIC_CNTL:
139 ret = i2c->cntl;
140 break;
141 case IIC_MDCNTL:
142 ret = i2c->mdcntl;
143 break;
144 case IIC_STS:
145 ret = i2c->sts;
146 break;
147 case IIC_EXTSTS:
148 ret = i2c_bus_busy(i2c->bus) ?
149 IIC_EXTSTS_BCS_BUSY : IIC_EXTSTS_BCS_FREE;
150 break;
151 case IIC_LSADR:
152 ret = i2c->lsadr;
153 break;
154 case IIC_HSADR:
155 ret = i2c->hsadr;
156 break;
157 case IIC_CLKDIV:
158 ret = i2c->clkdiv;
159 break;
160 case IIC_INTRMSK:
161 ret = i2c->intrmsk;
162 break;
163 case IIC_XFRCNT:
164 ret = i2c->xfrcnt;
165 break;
166 case IIC_XTCNTLSS:
167 ret = i2c->xtcntlss;
168 break;
169 case IIC_DIRECTCNTL:
170 ret = i2c->directcntl;
171 break;
172 default:
173 if (addr < PPC4xx_I2C_MEM_SIZE) {
174 qemu_log_mask(LOG_UNIMP, "%s: Unimplemented register 0x%"
175 HWADDR_PRIx "\n", __func__, addr);
176 } else {
177 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address 0x%"
178 HWADDR_PRIx "\n", __func__, addr);
179 }
180 ret = 0;
181 break;
182 }
183 return ret;
184}
185
186static void ppc4xx_i2c_writeb(void *opaque, hwaddr addr, uint64_t value,
187 unsigned int size)
188{
189 PPC4xxI2CState *i2c = opaque;
190
191 switch (addr) {
192 case IIC_MDBUF:
193 if (i2c->mdidx >= 3) {
194 break;
195 }
196 i2c->mdata[++i2c->mdidx] = value;
197 if (i2c->mdidx == 3) {
198 i2c->sts |= IIC_STS_MDBF;
199 } else if (i2c->mdidx == 0) {
200 i2c->sts |= IIC_STS_MDBS;
201 }
202 break;
203 case IIC_LMADR:
204 i2c->lmadr = value;
205 break;
206 case IIC_HMADR:
207 i2c->hmadr = value;
208 break;
209 case IIC_CNTL:
210 i2c->cntl = value & ~IIC_CNTL_PT;
211 if (value & IIC_CNTL_AMD) {
212 qemu_log_mask(LOG_UNIMP, "%s: only 7 bit addresses supported\n",
213 __func__);
214 }
215 if (value & IIC_CNTL_HMT && i2c_bus_busy(i2c->bus)) {
216 i2c_end_transfer(i2c->bus);
217 if (i2c->mdcntl & IIC_MDCNTL_EINT &&
218 i2c->intrmsk & IIC_INTRMSK_EIHE) {
219 i2c->sts |= IIC_STS_IRQA;
220 qemu_irq_raise(i2c->irq);
221 }
222 } else if (value & IIC_CNTL_PT) {
223 int recv = (value & IIC_CNTL_READ) >> 1;
224 int tct = value >> 4 & 3;
225 int i;
226
227 if (recv && (i2c->lmadr >> 1) >= 0x50 && (i2c->lmadr >> 1) < 0x58) {
228
229 value |= IIC_CNTL_RPST;
230 }
231
232 for (i = 0; i <= tct; i++) {
233 if (!i2c_bus_busy(i2c->bus)) {
234 i2c->extsts = IIC_EXTSTS_BCS_FREE;
235 if (i2c_start_transfer(i2c->bus, i2c->lmadr >> 1, recv)) {
236 i2c->sts |= IIC_STS_ERR;
237 i2c->extsts |= IIC_EXTSTS_XFRA;
238 break;
239 } else {
240 i2c->sts &= ~IIC_STS_ERR;
241 }
242 }
243 if (!(i2c->sts & IIC_STS_ERR) &&
244 i2c_send_recv(i2c->bus, &i2c->mdata[i], !recv)) {
245 i2c->sts |= IIC_STS_ERR;
246 i2c->extsts |= IIC_EXTSTS_XFRA;
247 break;
248 }
249 if (value & IIC_CNTL_RPST || !(value & IIC_CNTL_CHT)) {
250 i2c_end_transfer(i2c->bus);
251 }
252 }
253 i2c->xfrcnt = i;
254 i2c->mdidx = i - 1;
255 if (recv && i2c->mdidx >= 0) {
256 i2c->sts |= IIC_STS_MDBS;
257 }
258 if (recv && i2c->mdidx == 3) {
259 i2c->sts |= IIC_STS_MDBF;
260 }
261 if (i && i2c->mdcntl & IIC_MDCNTL_EINT &&
262 i2c->intrmsk & IIC_INTRMSK_EIMTC) {
263 i2c->sts |= IIC_STS_IRQA;
264 qemu_irq_raise(i2c->irq);
265 }
266 }
267 break;
268 case IIC_MDCNTL:
269 i2c->mdcntl = value & 0x3d;
270 if (value & IIC_MDCNTL_ESM) {
271 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
272 __func__);
273 }
274 if (value & IIC_MDCNTL_FMDB) {
275 i2c->mdidx = -1;
276 memset(i2c->mdata, 0, ARRAY_SIZE(i2c->mdata));
277 i2c->sts &= ~(IIC_STS_MDBF | IIC_STS_MDBS);
278 }
279 break;
280 case IIC_STS:
281 i2c->sts &= ~(value & 0x0a);
282 if (value & IIC_STS_IRQA && i2c->mdcntl & IIC_MDCNTL_EINT) {
283 qemu_irq_lower(i2c->irq);
284 }
285 break;
286 case IIC_EXTSTS:
287 i2c->extsts &= ~(value & 0x8f);
288 break;
289 case IIC_LSADR:
290 i2c->lsadr = value;
291 break;
292 case IIC_HSADR:
293 i2c->hsadr = value;
294 break;
295 case IIC_CLKDIV:
296 i2c->clkdiv = value;
297 break;
298 case IIC_INTRMSK:
299 i2c->intrmsk = value;
300 break;
301 case IIC_XFRCNT:
302 i2c->xfrcnt = value & 0x77;
303 break;
304 case IIC_XTCNTLSS:
305 i2c->xtcntlss &= ~(value & 0xf0);
306 if (value & IIC_XTCNTLSS_SRST) {
307
308 ppc4xx_i2c_reset(DEVICE(i2c));
309 break;
310 }
311 break;
312 case IIC_DIRECTCNTL:
313 i2c->directcntl = value & (IIC_DIRECTCNTL_SDAC & IIC_DIRECTCNTL_SCLC);
314 i2c->directcntl |= (value & IIC_DIRECTCNTL_SCLC ? 1 : 0);
315 bitbang_i2c_set(i2c->bitbang, BITBANG_I2C_SCL,
316 i2c->directcntl & IIC_DIRECTCNTL_MSCL);
317 i2c->directcntl |= bitbang_i2c_set(i2c->bitbang, BITBANG_I2C_SDA,
318 (value & IIC_DIRECTCNTL_SDAC) != 0) << 1;
319 break;
320 default:
321 if (addr < PPC4xx_I2C_MEM_SIZE) {
322 qemu_log_mask(LOG_UNIMP, "%s: Unimplemented register 0x%"
323 HWADDR_PRIx "\n", __func__, addr);
324 } else {
325 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address 0x%"
326 HWADDR_PRIx "\n", __func__, addr);
327 }
328 break;
329 }
330}
331
332static const MemoryRegionOps ppc4xx_i2c_ops = {
333 .read = ppc4xx_i2c_readb,
334 .write = ppc4xx_i2c_writeb,
335 .valid.min_access_size = 1,
336 .valid.max_access_size = 4,
337 .impl.min_access_size = 1,
338 .impl.max_access_size = 1,
339 .endianness = DEVICE_NATIVE_ENDIAN,
340};
341
342static void ppc4xx_i2c_init(Object *o)
343{
344 PPC4xxI2CState *s = PPC4xx_I2C(o);
345
346 memory_region_init_io(&s->iomem, OBJECT(s), &ppc4xx_i2c_ops, s,
347 TYPE_PPC4xx_I2C, PPC4xx_I2C_MEM_SIZE);
348 sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
349 sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
350 s->bus = i2c_init_bus(DEVICE(s), "i2c");
351 s->bitbang = bitbang_i2c_init(s->bus);
352}
353
354static void ppc4xx_i2c_class_init(ObjectClass *klass, void *data)
355{
356 DeviceClass *dc = DEVICE_CLASS(klass);
357
358 dc->reset = ppc4xx_i2c_reset;
359}
360
361static const TypeInfo ppc4xx_i2c_type_info = {
362 .name = TYPE_PPC4xx_I2C,
363 .parent = TYPE_SYS_BUS_DEVICE,
364 .instance_size = sizeof(PPC4xxI2CState),
365 .instance_init = ppc4xx_i2c_init,
366 .class_init = ppc4xx_i2c_class_init,
367};
368
369static void ppc4xx_i2c_register_types(void)
370{
371 type_register_static(&ppc4xx_i2c_type_info);
372}
373
374type_init(ppc4xx_i2c_register_types)
375
