2 * Arm PrimeCell PL080/PL081 DMA controller
4 * Copyright (c) 2006 CodeSourcery.
5 * Written by Paul Brook
7 * This code is licenced under the GPL.
12 #define PL080_MAX_CHANNELS 8
13 #define PL080_CONF_E 0x1
14 #define PL080_CONF_M1 0x2
15 #define PL080_CONF_M2 0x4
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
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
48 pl080_channel chan[PL080_MAX_CHANNELS];
50 /* Flag to avoid recursive DMA invocations. */
56 static const unsigned char pl080_id[] =
57 { 0x80, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 };
59 static const unsigned char pl081_id[] =
60 { 0x81, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 };
62 static void pl080_update(pl080_state *s)
64 if ((s->tc_int & s->tc_mask)
65 || (s->err_int & s->err_mask))
66 pic_set_irq_new(s->pic, s->irq, 1);
68 pic_set_irq_new(s->pic, s->irq, 1);
71 static void pl080_run(pl080_state *s)
87 for (c = 0; c < s->nchannels; c++) {
88 if (s->chan[c].conf & PL080_CCONF_ITC)
90 if (s->chan[c].conf & PL080_CCONF_IE)
91 s->err_mask |= 1 << c;
94 if ((s->conf & PL080_CONF_E) == 0)
97 cpu_abort(cpu_single_env, "DMA active\n");
98 /* If we are already in the middle of a DMA operation then indicate that
99 there may be new DMA requests and return immediately. */
106 for (c = 0; c < s->nchannels; c++) {
109 /* Test if thiws channel has any pending DMA requests. */
110 if ((ch->conf & (PL080_CCONF_H | PL080_CCONF_E))
113 flow = (ch->conf >> 11) & 7;
115 cpu_abort(cpu_single_env,
116 "pl080_run: Peripheral flow control not implemented\n");
118 src_id = (ch->conf >> 1) & 0x1f;
119 dest_id = (ch->conf >> 6) & 0x1f;
120 size = ch->ctrl & 0xfff;
121 req = s->req_single | s->req_burst;
126 if ((req & (1u << dest_id)) == 0)
130 if ((req & (1u << src_id)) == 0)
134 if ((req & (1u << src_id)) == 0
135 || (req & (1u << dest_id)) == 0)
142 /* Transfer one element. */
143 /* ??? Should transfer multiple elements for a burst request. */
144 /* ??? Unclear what the proper behavior is when source and
145 destination widths are different. */
146 swidth = 1 << ((ch->ctrl >> 18) & 7);
147 dwidth = 1 << ((ch->ctrl >> 21) & 7);
148 for (n = 0; n < dwidth; n+= swidth) {
149 cpu_physical_memory_read(ch->src, buff + n, swidth);
150 if (ch->ctrl & PL080_CCTRL_SI)
153 xsize = (dwidth < swidth) ? swidth : dwidth;
154 /* ??? This may pad the value incorrectly for dwidth < 32. */
155 for (n = 0; n < xsize; n += dwidth) {
156 cpu_physical_memory_write(ch->dest + n, buff + n, dwidth);
157 if (ch->ctrl & PL080_CCTRL_DI)
162 ch->ctrl = (ch->ctrl & 0xfffff000) | size;
164 /* Transfer complete. */
166 ch->src = ldl_phys(ch->lli);
167 ch->dest = ldl_phys(ch->lli + 4);
168 ch->ctrl = ldl_phys(ch->lli + 12);
169 ch->lli = ldl_phys(ch->lli + 8);
171 ch->conf &= ~PL080_CCONF_E;
173 if (ch->ctrl & PL080_CCTRL_I) {
184 static uint32_t pl080_read(void *opaque, target_phys_addr_t offset)
186 pl080_state *s = (pl080_state *)opaque;
191 if (offset >= 0xfe0 && offset < 0x1000) {
192 if (s->nchannels == 8) {
193 return pl080_id[(offset - 0xfe0) >> 2];
195 return pl081_id[(offset - 0xfe0) >> 2];
198 if (offset >= 0x100 && offset < 0x200) {
199 i = (offset & 0xe0) >> 5;
200 if (i >= s->nchannels)
202 switch (offset >> 2) {
203 case 0: /* SrcAddr */
204 return s->chan[i].src;
205 case 1: /* DestAddr */
206 return s->chan[i].dest;
208 return s->chan[i].lli;
209 case 3: /* Control */
210 return s->chan[i].ctrl;
211 case 4: /* Configuration */
212 return s->chan[i].conf;
217 switch (offset >> 2) {
218 case 0: /* IntStatus */
219 return (s->tc_int & s->tc_mask) | (s->err_int & s->err_mask);
220 case 1: /* IntTCStatus */
221 return (s->tc_int & s->tc_mask);
222 case 3: /* IntErrorStatus */
223 return (s->err_int & s->err_mask);
224 case 5: /* RawIntTCStatus */
226 case 6: /* RawIntErrorStatus */
228 case 7: /* EnbldChns */
230 for (i = 0; i < s->nchannels; i++) {
231 if (s->chan[i].conf & PL080_CCONF_E)
235 case 8: /* SoftBReq */
236 case 9: /* SoftSReq */
237 case 10: /* SoftLBReq */
238 case 11: /* SoftLSReq */
239 /* ??? Implement these. */
241 case 12: /* Configuration */
247 cpu_abort(cpu_single_env, "pl080_read: Bad offset %x\n", offset);
252 static void pl080_write(void *opaque, target_phys_addr_t offset,
255 pl080_state *s = (pl080_state *)opaque;
259 if (offset >= 0x100 && offset < 0x200) {
260 i = (offset & 0xe0) >> 5;
261 if (i >= s->nchannels)
263 switch (offset >> 2) {
264 case 0: /* SrcAddr */
265 s->chan[i].src = value;
267 case 1: /* DestAddr */
268 s->chan[i].dest = value;
271 s->chan[i].lli = value;
273 case 3: /* Control */
274 s->chan[i].ctrl = value;
276 case 4: /* Configuration */
277 s->chan[i].conf = value;
282 switch (offset >> 2) {
283 case 2: /* IntTCClear */
286 case 4: /* IntErrorClear */
287 s->err_int &= ~value;
289 case 8: /* SoftBReq */
290 case 9: /* SoftSReq */
291 case 10: /* SoftLBReq */
292 case 11: /* SoftLSReq */
293 /* ??? Implement these. */
294 cpu_abort(cpu_single_env, "pl080_write: Soft DMA not implemented\n");
296 case 12: /* Configuration */
298 if (s->conf & (PL080_CONF_M1 | PL080_CONF_M1)) {
299 cpu_abort(cpu_single_env,
300 "pl080_write: Big-endian DMA not implemented\n");
309 cpu_abort(cpu_single_env, "pl080_write: Bad offset %x\n", offset);
314 static CPUReadMemoryFunc *pl080_readfn[] = {
320 static CPUWriteMemoryFunc *pl080_writefn[] = {
326 /* The PL080 and PL081 are the same except for the number of channels
327 they implement (8 and 2 respectively). */
328 void *pl080_init(uint32_t base, void *pic, int irq, int nchannels)
333 s = (pl080_state *)qemu_mallocz(sizeof(pl080_state));
334 iomemtype = cpu_register_io_memory(0, pl080_readfn,
336 cpu_register_physical_memory(base, 0x00000fff, iomemtype);
340 s->nchannels = nchannels;
341 /* ??? Save/restore. */