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CommitLineData
9ee6e8bb
PB
1/*
2 * Arm PrimeCell PL022 Synchronous Serial Port
3 *
4 * Copyright (c) 2007 CodeSourcery.
5 * Written by Paul Brook
6 *
8e31bf38 7 * This code is licensed under the GPL.
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PB
8 */
9
83c9f4ca
PB
10#include "hw/sysbus.h"
11#include "hw/ssi.h"
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PB
12
13//#define DEBUG_PL022 1
14
15#ifdef DEBUG_PL022
001faf32
BS
16#define DPRINTF(fmt, ...) \
17do { printf("pl022: " fmt , ## __VA_ARGS__); } while (0)
18#define BADF(fmt, ...) \
19do { fprintf(stderr, "pl022: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
9ee6e8bb 20#else
001faf32
BS
21#define DPRINTF(fmt, ...) do {} while(0)
22#define BADF(fmt, ...) \
23do { fprintf(stderr, "pl022: error: " fmt , ## __VA_ARGS__);} while (0)
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PB
24#endif
25
26#define PL022_CR1_LBM 0x01
27#define PL022_CR1_SSE 0x02
28#define PL022_CR1_MS 0x04
29#define PL022_CR1_SDO 0x08
30
31#define PL022_SR_TFE 0x01
32#define PL022_SR_TNF 0x02
33#define PL022_SR_RNE 0x04
34#define PL022_SR_RFF 0x08
35#define PL022_SR_BSY 0x10
36
37#define PL022_INT_ROR 0x01
38#define PL022_INT_RT 0x04
39#define PL022_INT_RX 0x04
40#define PL022_INT_TX 0x08
41
3d29bcee
AF
42#define TYPE_PL022 "pl022"
43#define PL022(obj) OBJECT_CHECK(PL022State, (obj), TYPE_PL022)
44
ce556e0b 45typedef struct PL022State {
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AF
46 SysBusDevice parent_obj;
47
02a59c37 48 MemoryRegion iomem;
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PB
49 uint32_t cr0;
50 uint32_t cr1;
51 uint32_t bitmask;
52 uint32_t sr;
53 uint32_t cpsr;
54 uint32_t is;
55 uint32_t im;
56 /* The FIFO head points to the next empty entry. */
57 int tx_fifo_head;
58 int rx_fifo_head;
59 int tx_fifo_len;
60 int rx_fifo_len;
61 uint16_t tx_fifo[8];
62 uint16_t rx_fifo[8];
63 qemu_irq irq;
5493e33f 64 SSIBus *ssi;
ce556e0b 65} PL022State;
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PB
66
67static const unsigned char pl022_id[8] =
68 { 0x22, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
69
ce556e0b 70static void pl022_update(PL022State *s)
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PB
71{
72 s->sr = 0;
73 if (s->tx_fifo_len == 0)
74 s->sr |= PL022_SR_TFE;
75 if (s->tx_fifo_len != 8)
76 s->sr |= PL022_SR_TNF;
77 if (s->rx_fifo_len != 0)
78 s->sr |= PL022_SR_RNE;
79 if (s->rx_fifo_len == 8)
80 s->sr |= PL022_SR_RFF;
81 if (s->tx_fifo_len)
82 s->sr |= PL022_SR_BSY;
83 s->is = 0;
84 if (s->rx_fifo_len >= 4)
85 s->is |= PL022_INT_RX;
86 if (s->tx_fifo_len <= 4)
87 s->is |= PL022_INT_TX;
88
89 qemu_set_irq(s->irq, (s->is & s->im) != 0);
90}
91
ce556e0b 92static void pl022_xfer(PL022State *s)
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PB
93{
94 int i;
95 int o;
96 int val;
97
98 if ((s->cr1 & PL022_CR1_SSE) == 0) {
99 pl022_update(s);
100 DPRINTF("Disabled\n");
101 return;
102 }
103
104 DPRINTF("Maybe xfer %d/%d\n", s->tx_fifo_len, s->rx_fifo_len);
105 i = (s->tx_fifo_head - s->tx_fifo_len) & 7;
106 o = s->rx_fifo_head;
107 /* ??? We do not emulate the line speed.
108 This may break some applications. The are two problematic cases:
109 (a) A driver feeds data into the TX FIFO until it is full,
110 and only then drains the RX FIFO. On real hardware the CPU can
111 feed data fast enough that the RX fifo never gets chance to overflow.
112 (b) A driver transmits data, deliberately allowing the RX FIFO to
113 overflow because it ignores the RX data anyway.
114
115 We choose to support (a) by stalling the transmit engine if it would
116 cause the RX FIFO to overflow. In practice much transmit-only code
117 falls into (a) because it flushes the RX FIFO to determine when
118 the transfer has completed. */
119 while (s->tx_fifo_len && s->rx_fifo_len < 8) {
120 DPRINTF("xfer\n");
121 val = s->tx_fifo[i];
122 if (s->cr1 & PL022_CR1_LBM) {
123 /* Loopback mode. */
9ee6e8bb 124 } else {
5493e33f 125 val = ssi_transfer(s->ssi, val);
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PB
126 }
127 s->rx_fifo[o] = val & s->bitmask;
128 i = (i + 1) & 7;
129 o = (o + 1) & 7;
130 s->tx_fifo_len--;
131 s->rx_fifo_len++;
132 }
133 s->rx_fifo_head = o;
134 pl022_update(s);
135}
136
a8170e5e 137static uint64_t pl022_read(void *opaque, hwaddr offset,
02a59c37 138 unsigned size)
9ee6e8bb 139{
ce556e0b 140 PL022State *s = (PL022State *)opaque;
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PB
141 int val;
142
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143 if (offset >= 0xfe0 && offset < 0x1000) {
144 return pl022_id[(offset - 0xfe0) >> 2];
145 }
146 switch (offset) {
147 case 0x00: /* CR0 */
148 return s->cr0;
149 case 0x04: /* CR1 */
150 return s->cr1;
151 case 0x08: /* DR */
152 if (s->rx_fifo_len) {
153 val = s->rx_fifo[(s->rx_fifo_head - s->rx_fifo_len) & 7];
154 DPRINTF("RX %02x\n", val);
155 s->rx_fifo_len--;
156 pl022_xfer(s);
157 } else {
158 val = 0;
159 }
160 return val;
161 case 0x0c: /* SR */
162 return s->sr;
163 case 0x10: /* CPSR */
164 return s->cpsr;
165 case 0x14: /* IMSC */
166 return s->im;
167 case 0x18: /* RIS */
168 return s->is;
169 case 0x1c: /* MIS */
170 return s->im & s->is;
171 case 0x20: /* DMACR */
172 /* Not implemented. */
173 return 0;
174 default:
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PM
175 qemu_log_mask(LOG_GUEST_ERROR,
176 "pl022_read: Bad offset %x\n", (int)offset);
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177 return 0;
178 }
179}
180
a8170e5e 181static void pl022_write(void *opaque, hwaddr offset,
02a59c37 182 uint64_t value, unsigned size)
9ee6e8bb 183{
ce556e0b 184 PL022State *s = (PL022State *)opaque;
9ee6e8bb 185
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PB
186 switch (offset) {
187 case 0x00: /* CR0 */
188 s->cr0 = value;
189 /* Clock rate and format are ignored. */
190 s->bitmask = (1 << ((value & 15) + 1)) - 1;
191 break;
192 case 0x04: /* CR1 */
193 s->cr1 = value;
194 if ((s->cr1 & (PL022_CR1_MS | PL022_CR1_SSE))
195 == (PL022_CR1_MS | PL022_CR1_SSE)) {
196 BADF("SPI slave mode not implemented\n");
197 }
198 pl022_xfer(s);
199 break;
200 case 0x08: /* DR */
201 if (s->tx_fifo_len < 8) {
02a59c37 202 DPRINTF("TX %02x\n", (unsigned)value);
9ee6e8bb
PB
203 s->tx_fifo[s->tx_fifo_head] = value & s->bitmask;
204 s->tx_fifo_head = (s->tx_fifo_head + 1) & 7;
205 s->tx_fifo_len++;
206 pl022_xfer(s);
207 }
208 break;
209 case 0x10: /* CPSR */
210 /* Prescaler. Ignored. */
211 s->cpsr = value & 0xff;
212 break;
213 case 0x14: /* IMSC */
214 s->im = value;
215 pl022_update(s);
216 break;
217 case 0x20: /* DMACR */
2ac71179 218 if (value) {
af83c32b 219 qemu_log_mask(LOG_UNIMP, "pl022: DMA not implemented\n");
2ac71179 220 }
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221 break;
222 default:
af83c32b
PM
223 qemu_log_mask(LOG_GUEST_ERROR,
224 "pl022_write: Bad offset %x\n", (int)offset);
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PB
225 }
226}
227
ce556e0b 228static void pl022_reset(PL022State *s)
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229{
230 s->rx_fifo_len = 0;
231 s->tx_fifo_len = 0;
232 s->im = 0;
233 s->is = PL022_INT_TX;
234 s->sr = PL022_SR_TFE | PL022_SR_TNF;
235}
236
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237static const MemoryRegionOps pl022_ops = {
238 .read = pl022_read,
239 .write = pl022_write,
240 .endianness = DEVICE_NATIVE_ENDIAN,
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PB
241};
242
075790c2
JQ
243static const VMStateDescription vmstate_pl022 = {
244 .name = "pl022_ssp",
245 .version_id = 1,
246 .minimum_version_id = 1,
247 .minimum_version_id_old = 1,
248 .fields = (VMStateField[]) {
ce556e0b
AF
249 VMSTATE_UINT32(cr0, PL022State),
250 VMSTATE_UINT32(cr1, PL022State),
251 VMSTATE_UINT32(bitmask, PL022State),
252 VMSTATE_UINT32(sr, PL022State),
253 VMSTATE_UINT32(cpsr, PL022State),
254 VMSTATE_UINT32(is, PL022State),
255 VMSTATE_UINT32(im, PL022State),
256 VMSTATE_INT32(tx_fifo_head, PL022State),
257 VMSTATE_INT32(rx_fifo_head, PL022State),
258 VMSTATE_INT32(tx_fifo_len, PL022State),
259 VMSTATE_INT32(rx_fifo_len, PL022State),
260 VMSTATE_UINT16(tx_fifo[0], PL022State),
261 VMSTATE_UINT16(rx_fifo[0], PL022State),
262 VMSTATE_UINT16(tx_fifo[1], PL022State),
263 VMSTATE_UINT16(rx_fifo[1], PL022State),
264 VMSTATE_UINT16(tx_fifo[2], PL022State),
265 VMSTATE_UINT16(rx_fifo[2], PL022State),
266 VMSTATE_UINT16(tx_fifo[3], PL022State),
267 VMSTATE_UINT16(rx_fifo[3], PL022State),
268 VMSTATE_UINT16(tx_fifo[4], PL022State),
269 VMSTATE_UINT16(rx_fifo[4], PL022State),
270 VMSTATE_UINT16(tx_fifo[5], PL022State),
271 VMSTATE_UINT16(rx_fifo[5], PL022State),
272 VMSTATE_UINT16(tx_fifo[6], PL022State),
273 VMSTATE_UINT16(rx_fifo[6], PL022State),
274 VMSTATE_UINT16(tx_fifo[7], PL022State),
275 VMSTATE_UINT16(rx_fifo[7], PL022State),
075790c2 276 VMSTATE_END_OF_LIST()
23e39294 277 }
075790c2 278};
23e39294 279
3d29bcee 280static int pl022_init(SysBusDevice *sbd)
9ee6e8bb 281{
3d29bcee
AF
282 DeviceState *dev = DEVICE(sbd);
283 PL022State *s = PL022(dev);
9ee6e8bb 284
29776739 285 memory_region_init_io(&s->iomem, OBJECT(s), &pl022_ops, s, "pl022", 0x1000);
3d29bcee
AF
286 sysbus_init_mmio(sbd, &s->iomem);
287 sysbus_init_irq(sbd, &s->irq);
288 s->ssi = ssi_create_bus(dev, "ssi");
9ee6e8bb 289 pl022_reset(s);
3d29bcee 290 vmstate_register(dev, -1, &vmstate_pl022, s);
81a322d4 291 return 0;
9ee6e8bb 292}
5493e33f 293
999e12bb
AL
294static void pl022_class_init(ObjectClass *klass, void *data)
295{
296 SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
297
298 sdc->init = pl022_init;
299}
300
8c43a6f0 301static const TypeInfo pl022_info = {
3d29bcee 302 .name = TYPE_PL022,
39bffca2 303 .parent = TYPE_SYS_BUS_DEVICE,
ce556e0b 304 .instance_size = sizeof(PL022State),
39bffca2 305 .class_init = pl022_class_init,
999e12bb
AL
306};
307
83f7d43a 308static void pl022_register_types(void)
5493e33f 309{
39bffca2 310 type_register_static(&pl022_info);
5493e33f
PB
311}
312
83f7d43a 313type_init(pl022_register_types)