LXR qemu/hw/ppc/pnv

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