hw/ppc/pnv_pnor.c

   1 /*
   2  * QEMU PowerNV PNOR simple model
   3  *
   4  * Copyright (c) 2015-2019, IBM Corporation.
   5  *
   6  * This code is licensed under the GPL version 2 or later. See the
   7  * COPYING file in the top-level directory.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "qapi/error.h"
  12 #include "qemu/error-report.h"
  13 #include "qemu/log.h"
  14 #include "qemu/units.h"
  15 #include "sysemu/block-backend.h"
  16 #include "sysemu/blockdev.h"
  17 #include "hw/loader.h"
  18 #include "hw/ppc/pnv_pnor.h"
  19 #include "hw/qdev-properties.h"
  20 #include "hw/qdev-properties-system.h"
  21
  22 static uint64_t pnv_pnor_read(void *opaque, hwaddr addr, unsigned size)
  23 {
  24     PnvPnor *s = PNV_PNOR(opaque);
  25     uint64_t ret = 0;
  26     int i;
  27
  28     for (i = 0; i < size; i++) {
  29         ret |= (uint64_t) s->storage[addr + i] << (8 * (size - i - 1));
  30     }
  31
  32     return ret;
  33 }
  34
  35 static void pnv_pnor_update(PnvPnor *s, int offset, int size)
  36 {
  37     int offset_end;
  38     int ret;
  39
  40     if (s->blk) {
  41         return;
  42     }
  43
  44     offset_end = offset + size;
  45     offset = QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE);
  46     offset_end = QEMU_ALIGN_UP(offset_end, BDRV_SECTOR_SIZE);
  47
  48     ret = blk_pwrite(s->blk, offset, s->storage + offset,
  49                      offset_end - offset, 0);
  50     if (ret < 0) {
  51         error_report("Could not update PNOR offset=0x%" PRIx32" : %s", offset,
  52                      strerror(-ret));
  53     }
  54 }
  55
  56 static void pnv_pnor_write(void *opaque, hwaddr addr, uint64_t data,
  57                            unsigned size)
  58 {
  59     PnvPnor *s = PNV_PNOR(opaque);
  60     int i;
  61
  62     for (i = 0; i < size; i++) {
  63         s->storage[addr + i] = (data >> (8 * (size - i - 1))) & 0xFF;
  64     }
  65     pnv_pnor_update(s, addr, size);
  66 }
  67
  68 /*
  69  * TODO: Check endianness: skiboot is BIG, Aspeed AHB is LITTLE, flash
  70  * is BIG.
  71  */
  72 static const MemoryRegionOps pnv_pnor_ops = {
  73     .read = pnv_pnor_read,
  74     .write = pnv_pnor_write,
  75     .endianness = DEVICE_BIG_ENDIAN,
  76     .valid = {
  77         .min_access_size = 1,
  78         .max_access_size = 4,
  79     },
  80 };
  81
  82 static void pnv_pnor_realize(DeviceState *dev, Error **errp)
  83 {
  84     PnvPnor *s = PNV_PNOR(dev);
  85     int ret;
  86
  87     if (s->blk) {
  88         uint64_t perm = BLK_PERM_CONSISTENT_READ |
  89                         (blk_supports_write_perm(s->blk) ? BLK_PERM_WRITE : 0);
  90         ret = blk_set_perm(s->blk, perm, BLK_PERM_ALL, errp);
  91         if (ret < 0) {
  92             return;
  93         }
  94
  95         s->size = blk_getlength(s->blk);
  96         if (s->size <= 0) {
  97             error_setg(errp, "failed to get flash size");
  98             return;
  99         }
 100
 101         s->storage = blk_blockalign(s->blk, s->size);
 102
 103         if (blk_pread(s->blk, 0, s->storage, s->size) != s->size) {
 104             error_setg(errp, "failed to read the initial flash content");
 105             return;
 106         }
 107     } else {
 108         s->storage = blk_blockalign(NULL, s->size);
 109         memset(s->storage, 0xFF, s->size);
 110     }
 111
 112     memory_region_init_io(&s->mmio, OBJECT(s), &pnv_pnor_ops, s,
 113                           TYPE_PNV_PNOR, s->size);
 114 }
 115
 116 static Property pnv_pnor_properties[] = {
 117     DEFINE_PROP_INT64("size", PnvPnor, size, 128 * MiB),
 118     DEFINE_PROP_DRIVE("drive", PnvPnor, blk),
 119     DEFINE_PROP_END_OF_LIST(),
 120 };
 121
 122 static void pnv_pnor_class_init(ObjectClass *klass, void *data)
 123 {
 124     DeviceClass *dc = DEVICE_CLASS(klass);
 125
 126     dc->realize = pnv_pnor_realize;
 127     device_class_set_props(dc, pnv_pnor_properties);
 128 }
 129
 130 static const TypeInfo pnv_pnor_info = {
 131     .name          = TYPE_PNV_PNOR,
 132     .parent        = TYPE_SYS_BUS_DEVICE,
 133     .instance_size = sizeof(PnvPnor),
 134     .class_init    = pnv_pnor_class_init,
 135 };
 136
 137 static void pnv_pnor_register_types(void)
 138 {
 139     type_register_static(&pnv_pnor_info);
 140 }
 141
 142 type_init(pnv_pnor_register_types)