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/*
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* Arm PrimeCell PL080/PL081 DMA controller
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*
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* Copyright (c) 2006 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the GPL.
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*/
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#include "sysbus.h" |
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#define PL080_MAX_CHANNELS 8 |
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#define PL080_CONF_E 0x1 |
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#define PL080_CONF_M1 0x2 |
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#define PL080_CONF_M2 0x4 |
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#define PL080_CCONF_H 0x40000 |
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#define PL080_CCONF_A 0x20000 |
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#define PL080_CCONF_L 0x10000 |
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#define PL080_CCONF_ITC 0x08000 |
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#define PL080_CCONF_IE 0x04000 |
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#define PL080_CCONF_E 0x00001 |
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#define PL080_CCTRL_I 0x80000000 |
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#define PL080_CCTRL_DI 0x08000000 |
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#define PL080_CCTRL_SI 0x04000000 |
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#define PL080_CCTRL_D 0x02000000 |
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#define PL080_CCTRL_S 0x01000000 |
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typedef struct { |
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uint32_t src; |
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uint32_t dest; |
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uint32_t lli; |
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uint32_t ctrl; |
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uint32_t conf; |
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} pl080_channel; |
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typedef struct { |
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SysBusDevice busdev; |
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uint8_t tc_int; |
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uint8_t tc_mask; |
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uint8_t err_int; |
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uint8_t err_mask; |
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uint32_t conf; |
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uint32_t sync; |
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uint32_t req_single; |
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uint32_t req_burst; |
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pl080_channel chan[PL080_MAX_CHANNELS]; |
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int nchannels;
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/* Flag to avoid recursive DMA invocations. */
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int running;
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qemu_irq irq; |
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} pl080_state; |
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static const unsigned char pl080_id[] = |
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{ 0x80, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 }; |
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static const unsigned char pl081_id[] = |
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{ 0x81, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 }; |
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static void pl080_update(pl080_state *s) |
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{ |
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if ((s->tc_int & s->tc_mask)
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|| (s->err_int & s->err_mask)) |
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qemu_irq_raise(s->irq); |
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else
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qemu_irq_lower(s->irq); |
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} |
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static void pl080_run(pl080_state *s) |
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{ |
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int c;
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int flow;
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pl080_channel *ch; |
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int swidth;
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int dwidth;
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int xsize;
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int n;
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int src_id;
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int dest_id;
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int size;
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uint8_t buff[4];
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uint32_t req; |
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s->tc_mask = 0;
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for (c = 0; c < s->nchannels; c++) { |
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if (s->chan[c].conf & PL080_CCONF_ITC)
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s->tc_mask |= 1 << c;
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if (s->chan[c].conf & PL080_CCONF_IE)
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s->err_mask |= 1 << c;
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} |
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if ((s->conf & PL080_CONF_E) == 0) |
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return;
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hw_error("DMA active\n");
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/* If we are already in the middle of a DMA operation then indicate that
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there may be new DMA requests and return immediately. */
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if (s->running) {
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s->running++; |
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return;
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} |
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s->running = 1;
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while (s->running) {
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for (c = 0; c < s->nchannels; c++) { |
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ch = &s->chan[c]; |
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again:
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/* Test if thiws channel has any pending DMA requests. */
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if ((ch->conf & (PL080_CCONF_H | PL080_CCONF_E))
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!= PL080_CCONF_E) |
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continue;
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flow = (ch->conf >> 11) & 7; |
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if (flow >= 4) { |
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hw_error( |
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"pl080_run: Peripheral flow control not implemented\n");
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} |
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src_id = (ch->conf >> 1) & 0x1f; |
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dest_id = (ch->conf >> 6) & 0x1f; |
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size = ch->ctrl & 0xfff;
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req = s->req_single | s->req_burst; |
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switch (flow) {
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case 0: |
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break;
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case 1: |
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if ((req & (1u << dest_id)) == 0) |
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size = 0;
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break;
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case 2: |
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if ((req & (1u << src_id)) == 0) |
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size = 0;
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break;
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case 3: |
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if ((req & (1u << src_id)) == 0 |
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|| (req & (1u << dest_id)) == 0) |
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size = 0;
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break;
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} |
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if (!size)
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continue;
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/* Transfer one element. */
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/* ??? Should transfer multiple elements for a burst request. */
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/* ??? Unclear what the proper behavior is when source and
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destination widths are different. */
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swidth = 1 << ((ch->ctrl >> 18) & 7); |
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dwidth = 1 << ((ch->ctrl >> 21) & 7); |
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for (n = 0; n < dwidth; n+= swidth) { |
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cpu_physical_memory_read(ch->src, buff + n, swidth); |
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if (ch->ctrl & PL080_CCTRL_SI)
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ch->src += swidth; |
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} |
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xsize = (dwidth < swidth) ? swidth : dwidth; |
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/* ??? This may pad the value incorrectly for dwidth < 32. */
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for (n = 0; n < xsize; n += dwidth) { |
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cpu_physical_memory_write(ch->dest + n, buff + n, dwidth); |
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if (ch->ctrl & PL080_CCTRL_DI)
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ch->dest += swidth; |
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} |
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size--; |
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ch->ctrl = (ch->ctrl & 0xfffff000) | size;
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if (size == 0) { |
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/* Transfer complete. */
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if (ch->lli) {
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ch->src = ldl_phys(ch->lli); |
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ch->dest = ldl_phys(ch->lli + 4);
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ch->ctrl = ldl_phys(ch->lli + 12);
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ch->lli = ldl_phys(ch->lli + 8);
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} else {
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ch->conf &= ~PL080_CCONF_E; |
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} |
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if (ch->ctrl & PL080_CCTRL_I) {
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s->tc_int |= 1 << c;
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} |
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} |
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goto again;
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} |
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if (--s->running)
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s->running = 1;
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} |
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} |
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static uint32_t pl080_read(void *opaque, target_phys_addr_t offset) |
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{ |
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pl080_state *s = (pl080_state *)opaque; |
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uint32_t i; |
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uint32_t mask; |
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if (offset >= 0xfe0 && offset < 0x1000) { |
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if (s->nchannels == 8) { |
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return pl080_id[(offset - 0xfe0) >> 2]; |
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} else {
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return pl081_id[(offset - 0xfe0) >> 2]; |
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} |
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} |
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if (offset >= 0x100 && offset < 0x200) { |
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i = (offset & 0xe0) >> 5; |
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if (i >= s->nchannels)
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goto bad_offset;
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switch (offset >> 2) { |
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case 0: /* SrcAddr */ |
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return s->chan[i].src;
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case 1: /* DestAddr */ |
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return s->chan[i].dest;
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case 2: /* LLI */ |
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return s->chan[i].lli;
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case 3: /* Control */ |
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return s->chan[i].ctrl;
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case 4: /* Configuration */ |
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return s->chan[i].conf;
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default:
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goto bad_offset;
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} |
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} |
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switch (offset >> 2) { |
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case 0: /* IntStatus */ |
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return (s->tc_int & s->tc_mask) | (s->err_int & s->err_mask);
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case 1: /* IntTCStatus */ |
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return (s->tc_int & s->tc_mask);
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case 3: /* IntErrorStatus */ |
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return (s->err_int & s->err_mask);
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case 5: /* RawIntTCStatus */ |
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return s->tc_int;
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case 6: /* RawIntErrorStatus */ |
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return s->err_int;
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case 7: /* EnbldChns */ |
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mask = 0;
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for (i = 0; i < s->nchannels; i++) { |
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if (s->chan[i].conf & PL080_CCONF_E)
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mask |= 1 << i;
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} |
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return mask;
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case 8: /* SoftBReq */ |
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case 9: /* SoftSReq */ |
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case 10: /* SoftLBReq */ |
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case 11: /* SoftLSReq */ |
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/* ??? Implement these. */
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return 0; |
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case 12: /* Configuration */ |
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return s->conf;
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case 13: /* Sync */ |
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return s->sync;
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default:
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bad_offset:
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hw_error("pl080_read: Bad offset %x\n", (int)offset); |
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return 0; |
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} |
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} |
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static void pl080_write(void *opaque, target_phys_addr_t offset, |
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uint32_t value) |
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{ |
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pl080_state *s = (pl080_state *)opaque; |
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int i;
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if (offset >= 0x100 && offset < 0x200) { |
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i = (offset & 0xe0) >> 5; |
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if (i >= s->nchannels)
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goto bad_offset;
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switch (offset >> 2) { |
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case 0: /* SrcAddr */ |
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s->chan[i].src = value; |
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break;
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case 1: /* DestAddr */ |
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s->chan[i].dest = value; |
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break;
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case 2: /* LLI */ |
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s->chan[i].lli = value; |
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break;
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case 3: /* Control */ |
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s->chan[i].ctrl = value; |
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break;
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case 4: /* Configuration */ |
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s->chan[i].conf = value; |
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pl080_run(s); |
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break;
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} |
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} |
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switch (offset >> 2) { |
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case 2: /* IntTCClear */ |
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s->tc_int &= ~value; |
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break;
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case 4: /* IntErrorClear */ |
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s->err_int &= ~value; |
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break;
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case 8: /* SoftBReq */ |
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case 9: /* SoftSReq */ |
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case 10: /* SoftLBReq */ |
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case 11: /* SoftLSReq */ |
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/* ??? Implement these. */
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hw_error("pl080_write: Soft DMA not implemented\n");
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break;
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case 12: /* Configuration */ |
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s->conf = value; |
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if (s->conf & (PL080_CONF_M1 | PL080_CONF_M1)) {
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hw_error("pl080_write: Big-endian DMA not implemented\n");
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} |
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pl080_run(s); |
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break;
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case 13: /* Sync */ |
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s->sync = value; |
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break;
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default:
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bad_offset:
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hw_error("pl080_write: Bad offset %x\n", (int)offset); |
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} |
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pl080_update(s); |
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} |
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static CPUReadMemoryFunc * const pl080_readfn[] = { |
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pl080_read, |
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pl080_read, |
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pl080_read |
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}; |
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static CPUWriteMemoryFunc * const pl080_writefn[] = { |
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pl080_write, |
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pl080_write, |
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pl080_write |
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}; |
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static int pl08x_init(SysBusDevice *dev, int nchannels) |
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{ |
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int iomemtype;
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pl080_state *s = FROM_SYSBUS(pl080_state, dev); |
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iomemtype = cpu_register_io_memory(pl080_readfn, |
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pl080_writefn, s); |
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sysbus_init_mmio(dev, 0x1000, iomemtype);
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sysbus_init_irq(dev, &s->irq); |
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s->nchannels = nchannels; |
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/* ??? Save/restore. */
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return 0; |
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} |
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static int pl080_init(SysBusDevice *dev) |
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{ |
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return pl08x_init(dev, 8); |
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} |
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static int pl081_init(SysBusDevice *dev) |
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{ |
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return pl08x_init(dev, 2); |
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} |
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/* The PL080 and PL081 are the same except for the number of channels
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they implement (8 and 2 respectively). */
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static void pl080_register_devices(void) |
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{ |
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sysbus_register_dev("pl080", sizeof(pl080_state), pl080_init); |
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sysbus_register_dev("pl081", sizeof(pl080_state), pl081_init); |
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} |
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device_init(pl080_register_devices) |