| 1 | /* |
| 2 | * QEMU Alpha PCI support functions. |
| 3 | * |
| 4 | * Some of this isn't very Alpha specific at all. |
| 5 | * |
| 6 | * ??? Sparse memory access not implemented. |
| 7 | */ |
| 8 | |
| 9 | #include "qemu/osdep.h" |
| 10 | #include "hw/pci/pci_host.h" |
| 11 | #include "alpha_sys.h" |
| 12 | #include "qemu/log.h" |
| 13 | #include "trace.h" |
| 14 | |
| 15 | |
| 16 | /* Fallback for unassigned PCI I/O operations. Avoids MCHK. */ |
| 17 | |
| 18 | static uint64_t ignore_read(void *opaque, hwaddr addr, unsigned size) |
| 19 | { |
| 20 | return 0; |
| 21 | } |
| 22 | |
| 23 | static void ignore_write(void *opaque, hwaddr addr, uint64_t v, unsigned size) |
| 24 | { |
| 25 | } |
| 26 | |
| 27 | const MemoryRegionOps alpha_pci_ignore_ops = { |
| 28 | .read = ignore_read, |
| 29 | .write = ignore_write, |
| 30 | .endianness = DEVICE_LITTLE_ENDIAN, |
| 31 | .valid = { |
| 32 | .min_access_size = 1, |
| 33 | .max_access_size = 8, |
| 34 | }, |
| 35 | .impl = { |
| 36 | .min_access_size = 1, |
| 37 | .max_access_size = 8, |
| 38 | }, |
| 39 | }; |
| 40 | |
| 41 | |
| 42 | /* PCI config space reads/writes, to byte-word addressable memory. */ |
| 43 | static uint64_t bw_conf1_read(void *opaque, hwaddr addr, |
| 44 | unsigned size) |
| 45 | { |
| 46 | PCIBus *b = opaque; |
| 47 | return pci_data_read(b, addr, size); |
| 48 | } |
| 49 | |
| 50 | static void bw_conf1_write(void *opaque, hwaddr addr, |
| 51 | uint64_t val, unsigned size) |
| 52 | { |
| 53 | PCIBus *b = opaque; |
| 54 | pci_data_write(b, addr, val, size); |
| 55 | } |
| 56 | |
| 57 | const MemoryRegionOps alpha_pci_conf1_ops = { |
| 58 | .read = bw_conf1_read, |
| 59 | .write = bw_conf1_write, |
| 60 | .endianness = DEVICE_LITTLE_ENDIAN, |
| 61 | .impl = { |
| 62 | .min_access_size = 1, |
| 63 | .max_access_size = 4, |
| 64 | }, |
| 65 | }; |
| 66 | |
| 67 | /* PCI/EISA Interrupt Acknowledge Cycle. */ |
| 68 | |
| 69 | static uint64_t iack_read(void *opaque, hwaddr addr, unsigned size) |
| 70 | { |
| 71 | return pic_read_irq(isa_pic); |
| 72 | } |
| 73 | |
| 74 | static void special_write(void *opaque, hwaddr addr, |
| 75 | uint64_t val, unsigned size) |
| 76 | { |
| 77 | trace_alpha_pci_iack_write(); |
| 78 | } |
| 79 | |
| 80 | const MemoryRegionOps alpha_pci_iack_ops = { |
| 81 | .read = iack_read, |
| 82 | .write = special_write, |
| 83 | .endianness = DEVICE_LITTLE_ENDIAN, |
| 84 | .valid = { |
| 85 | .min_access_size = 4, |
| 86 | .max_access_size = 4, |
| 87 | }, |
| 88 | .impl = { |
| 89 | .min_access_size = 4, |
| 90 | .max_access_size = 4, |
| 91 | }, |
| 92 | }; |