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