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1.1.1.3 root 1: /*
1.1.1.2 root 2: * Arm PrimeCell PL080/PL081 DMA controller
1.1 root 3: *
4: * Copyright (c) 2006 CodeSourcery.
5: * Written by Paul Brook
6: *
7: * This code is licenced under the GPL.
8: */
9:
1.1.1.5 ! root 10: #include "sysbus.h"
1.1 root 11:
1.1.1.2 root 12: #define PL080_MAX_CHANNELS 8
1.1 root 13: #define PL080_CONF_E 0x1
14: #define PL080_CONF_M1 0x2
15: #define PL080_CONF_M2 0x4
16:
17: #define PL080_CCONF_H 0x40000
18: #define PL080_CCONF_A 0x20000
19: #define PL080_CCONF_L 0x10000
20: #define PL080_CCONF_ITC 0x08000
21: #define PL080_CCONF_IE 0x04000
22: #define PL080_CCONF_E 0x00001
23:
24: #define PL080_CCTRL_I 0x80000000
25: #define PL080_CCTRL_DI 0x08000000
26: #define PL080_CCTRL_SI 0x04000000
27: #define PL080_CCTRL_D 0x02000000
28: #define PL080_CCTRL_S 0x01000000
29:
30: typedef struct {
31: uint32_t src;
32: uint32_t dest;
33: uint32_t lli;
34: uint32_t ctrl;
35: uint32_t conf;
36: } pl080_channel;
37:
38: typedef struct {
1.1.1.5 ! root 39: SysBusDevice busdev;
1.1 root 40: uint8_t tc_int;
41: uint8_t tc_mask;
42: uint8_t err_int;
43: uint8_t err_mask;
44: uint32_t conf;
45: uint32_t sync;
46: uint32_t req_single;
47: uint32_t req_burst;
1.1.1.2 root 48: pl080_channel chan[PL080_MAX_CHANNELS];
49: int nchannels;
1.1 root 50: /* Flag to avoid recursive DMA invocations. */
51: int running;
1.1.1.3 root 52: qemu_irq irq;
1.1 root 53: } pl080_state;
54:
55: static const unsigned char pl080_id[] =
56: { 0x80, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 };
57:
1.1.1.2 root 58: static const unsigned char pl081_id[] =
59: { 0x81, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 };
60:
1.1 root 61: static void pl080_update(pl080_state *s)
62: {
63: if ((s->tc_int & s->tc_mask)
64: || (s->err_int & s->err_mask))
1.1.1.3 root 65: qemu_irq_raise(s->irq);
1.1 root 66: else
1.1.1.3 root 67: qemu_irq_lower(s->irq);
1.1 root 68: }
69:
70: static void pl080_run(pl080_state *s)
71: {
72: int c;
73: int flow;
74: pl080_channel *ch;
75: int swidth;
76: int dwidth;
77: int xsize;
78: int n;
79: int src_id;
80: int dest_id;
81: int size;
1.1.1.4 root 82: uint8_t buff[4];
1.1 root 83: uint32_t req;
84:
85: s->tc_mask = 0;
1.1.1.2 root 86: for (c = 0; c < s->nchannels; c++) {
1.1 root 87: if (s->chan[c].conf & PL080_CCONF_ITC)
88: s->tc_mask |= 1 << c;
89: if (s->chan[c].conf & PL080_CCONF_IE)
90: s->err_mask |= 1 << c;
91: }
92:
93: if ((s->conf & PL080_CONF_E) == 0)
94: return;
95:
1.1.1.5 ! root 96: hw_error("DMA active\n");
1.1 root 97: /* If we are already in the middle of a DMA operation then indicate that
98: there may be new DMA requests and return immediately. */
99: if (s->running) {
100: s->running++;
101: return;
102: }
103: s->running = 1;
104: while (s->running) {
1.1.1.2 root 105: for (c = 0; c < s->nchannels; c++) {
1.1 root 106: ch = &s->chan[c];
107: again:
108: /* Test if thiws channel has any pending DMA requests. */
109: if ((ch->conf & (PL080_CCONF_H | PL080_CCONF_E))
110: != PL080_CCONF_E)
111: continue;
112: flow = (ch->conf >> 11) & 7;
113: if (flow >= 4) {
1.1.1.5 ! root 114: hw_error(
1.1 root 115: "pl080_run: Peripheral flow control not implemented\n");
116: }
117: src_id = (ch->conf >> 1) & 0x1f;
118: dest_id = (ch->conf >> 6) & 0x1f;
119: size = ch->ctrl & 0xfff;
120: req = s->req_single | s->req_burst;
121: switch (flow) {
122: case 0:
123: break;
124: case 1:
125: if ((req & (1u << dest_id)) == 0)
126: size = 0;
127: break;
128: case 2:
129: if ((req & (1u << src_id)) == 0)
130: size = 0;
131: break;
132: case 3:
133: if ((req & (1u << src_id)) == 0
134: || (req & (1u << dest_id)) == 0)
135: size = 0;
136: break;
137: }
138: if (!size)
139: continue;
140:
141: /* Transfer one element. */
142: /* ??? Should transfer multiple elements for a burst request. */
143: /* ??? Unclear what the proper behavior is when source and
144: destination widths are different. */
145: swidth = 1 << ((ch->ctrl >> 18) & 7);
146: dwidth = 1 << ((ch->ctrl >> 21) & 7);
147: for (n = 0; n < dwidth; n+= swidth) {
148: cpu_physical_memory_read(ch->src, buff + n, swidth);
149: if (ch->ctrl & PL080_CCTRL_SI)
150: ch->src += swidth;
151: }
152: xsize = (dwidth < swidth) ? swidth : dwidth;
153: /* ??? This may pad the value incorrectly for dwidth < 32. */
154: for (n = 0; n < xsize; n += dwidth) {
155: cpu_physical_memory_write(ch->dest + n, buff + n, dwidth);
156: if (ch->ctrl & PL080_CCTRL_DI)
157: ch->dest += swidth;
158: }
159:
160: size--;
161: ch->ctrl = (ch->ctrl & 0xfffff000) | size;
162: if (size == 0) {
163: /* Transfer complete. */
164: if (ch->lli) {
165: ch->src = ldl_phys(ch->lli);
166: ch->dest = ldl_phys(ch->lli + 4);
167: ch->ctrl = ldl_phys(ch->lli + 12);
168: ch->lli = ldl_phys(ch->lli + 8);
169: } else {
170: ch->conf &= ~PL080_CCONF_E;
171: }
172: if (ch->ctrl & PL080_CCTRL_I) {
173: s->tc_int |= 1 << c;
174: }
175: }
176: goto again;
177: }
178: if (--s->running)
179: s->running = 1;
180: }
181: }
182:
183: static uint32_t pl080_read(void *opaque, target_phys_addr_t offset)
184: {
185: pl080_state *s = (pl080_state *)opaque;
186: uint32_t i;
187: uint32_t mask;
188:
189: if (offset >= 0xfe0 && offset < 0x1000) {
1.1.1.2 root 190: if (s->nchannels == 8) {
191: return pl080_id[(offset - 0xfe0) >> 2];
192: } else {
193: return pl081_id[(offset - 0xfe0) >> 2];
194: }
1.1 root 195: }
196: if (offset >= 0x100 && offset < 0x200) {
197: i = (offset & 0xe0) >> 5;
1.1.1.2 root 198: if (i >= s->nchannels)
199: goto bad_offset;
1.1 root 200: switch (offset >> 2) {
201: case 0: /* SrcAddr */
202: return s->chan[i].src;
203: case 1: /* DestAddr */
204: return s->chan[i].dest;
205: case 2: /* LLI */
206: return s->chan[i].lli;
207: case 3: /* Control */
208: return s->chan[i].ctrl;
209: case 4: /* Configuration */
210: return s->chan[i].conf;
211: default:
212: goto bad_offset;
213: }
214: }
215: switch (offset >> 2) {
216: case 0: /* IntStatus */
217: return (s->tc_int & s->tc_mask) | (s->err_int & s->err_mask);
218: case 1: /* IntTCStatus */
219: return (s->tc_int & s->tc_mask);
220: case 3: /* IntErrorStatus */
221: return (s->err_int & s->err_mask);
222: case 5: /* RawIntTCStatus */
223: return s->tc_int;
224: case 6: /* RawIntErrorStatus */
225: return s->err_int;
226: case 7: /* EnbldChns */
227: mask = 0;
1.1.1.2 root 228: for (i = 0; i < s->nchannels; i++) {
1.1 root 229: if (s->chan[i].conf & PL080_CCONF_E)
230: mask |= 1 << i;
231: }
232: return mask;
233: case 8: /* SoftBReq */
234: case 9: /* SoftSReq */
235: case 10: /* SoftLBReq */
236: case 11: /* SoftLSReq */
237: /* ??? Implement these. */
238: return 0;
239: case 12: /* Configuration */
240: return s->conf;
241: case 13: /* Sync */
242: return s->sync;
243: default:
244: bad_offset:
1.1.1.5 ! root 245: hw_error("pl080_read: Bad offset %x\n", (int)offset);
1.1 root 246: return 0;
247: }
248: }
249:
250: static void pl080_write(void *opaque, target_phys_addr_t offset,
251: uint32_t value)
252: {
253: pl080_state *s = (pl080_state *)opaque;
254: int i;
255:
256: if (offset >= 0x100 && offset < 0x200) {
257: i = (offset & 0xe0) >> 5;
1.1.1.2 root 258: if (i >= s->nchannels)
259: goto bad_offset;
1.1 root 260: switch (offset >> 2) {
261: case 0: /* SrcAddr */
262: s->chan[i].src = value;
263: break;
264: case 1: /* DestAddr */
265: s->chan[i].dest = value;
266: break;
267: case 2: /* LLI */
268: s->chan[i].lli = value;
269: break;
270: case 3: /* Control */
271: s->chan[i].ctrl = value;
272: break;
273: case 4: /* Configuration */
274: s->chan[i].conf = value;
275: pl080_run(s);
276: break;
277: }
278: }
279: switch (offset >> 2) {
280: case 2: /* IntTCClear */
281: s->tc_int &= ~value;
282: break;
283: case 4: /* IntErrorClear */
284: s->err_int &= ~value;
285: break;
286: case 8: /* SoftBReq */
287: case 9: /* SoftSReq */
288: case 10: /* SoftLBReq */
289: case 11: /* SoftLSReq */
290: /* ??? Implement these. */
1.1.1.5 ! root 291: hw_error("pl080_write: Soft DMA not implemented\n");
1.1 root 292: break;
293: case 12: /* Configuration */
294: s->conf = value;
295: if (s->conf & (PL080_CONF_M1 | PL080_CONF_M1)) {
1.1.1.5 ! root 296: hw_error("pl080_write: Big-endian DMA not implemented\n");
1.1 root 297: }
298: pl080_run(s);
299: break;
300: case 13: /* Sync */
301: s->sync = value;
302: break;
303: default:
1.1.1.2 root 304: bad_offset:
1.1.1.5 ! root 305: hw_error("pl080_write: Bad offset %x\n", (int)offset);
1.1 root 306: }
307: pl080_update(s);
308: }
309:
310: static CPUReadMemoryFunc *pl080_readfn[] = {
311: pl080_read,
312: pl080_read,
313: pl080_read
314: };
315:
316: static CPUWriteMemoryFunc *pl080_writefn[] = {
317: pl080_write,
318: pl080_write,
319: pl080_write
320: };
321:
1.1.1.5 ! root 322: static void pl08x_init(SysBusDevice *dev, int nchannels)
1.1 root 323: {
324: int iomemtype;
1.1.1.5 ! root 325: pl080_state *s = FROM_SYSBUS(pl080_state, dev);
1.1 root 326:
1.1.1.5 ! root 327: iomemtype = cpu_register_io_memory(pl080_readfn,
1.1 root 328: pl080_writefn, s);
1.1.1.5 ! root 329: sysbus_init_mmio(dev, 0x1000, iomemtype);
! 330: sysbus_init_irq(dev, &s->irq);
1.1.1.2 root 331: s->nchannels = nchannels;
1.1 root 332: /* ??? Save/restore. */
333: }
1.1.1.5 ! root 334:
! 335: static void pl080_init(SysBusDevice *dev)
! 336: {
! 337: pl08x_init(dev, 8);
! 338: }
! 339:
! 340: static void pl081_init(SysBusDevice *dev)
! 341: {
! 342: pl08x_init(dev, 2);
! 343: }
! 344:
! 345: /* The PL080 and PL081 are the same except for the number of channels
! 346: they implement (8 and 2 respectively). */
! 347: static void pl080_register_devices(void)
! 348: {
! 349: sysbus_register_dev("pl080", sizeof(pl080_state), pl080_init);
! 350: sysbus_register_dev("pl081", sizeof(pl080_state), pl081_init);
! 351: }
! 352:
! 353: device_init(pl080_register_devices)
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