qemu

FORK: QEMU emulator
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xlnx-versal-efuse-cache.c (3554B)

      1 /*
      2  * QEMU model of the EFuse_Cache
      3  *
      4  * Copyright (c) 2017 Xilinx Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a copy
      7  * of this software and associated documentation files (the "Software"), to deal
      8  * in the Software without restriction, including without limitation the rights
      9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10  * copies of the Software, and to permit persons to whom the Software is
     11  * furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     22  * THE SOFTWARE.
     23  */
     24 
     25 #include "qemu/osdep.h"
     26 #include "hw/nvram/xlnx-versal-efuse.h"
     27 
     28 #include "qemu/log.h"
     29 #include "hw/qdev-properties.h"
     30 
     31 #define MR_SIZE 0xC00
     32 
     33 static uint64_t efuse_cache_read(void *opaque, hwaddr addr, unsigned size)
     34 {
     35     XlnxVersalEFuseCache *s = XLNX_VERSAL_EFUSE_CACHE(opaque);
     36     unsigned int w0 = QEMU_ALIGN_DOWN(addr * 8, 32);
     37     unsigned int w1 = QEMU_ALIGN_DOWN((addr + size - 1) * 8, 32);
     38 
     39     uint64_t ret;
     40 
     41     assert(w0 == w1 || (w0 + 32) == w1);
     42 
     43     ret = xlnx_versal_efuse_read_row(s->efuse, w1, NULL);
     44     if (w0 < w1) {
     45         ret <<= 32;
     46         ret |= xlnx_versal_efuse_read_row(s->efuse, w0, NULL);
     47     }
     48 
     49     /* If 'addr' unaligned, the guest is always assumed to be little-endian. */
     50     addr &= 3;
     51     if (addr) {
     52         ret >>= 8 * addr;
     53     }
     54 
     55     return ret;
     56 }
     57 
     58 static void efuse_cache_write(void *opaque, hwaddr addr, uint64_t value,
     59                               unsigned size)
     60 {
     61     /* No Register Writes allowed */
     62     qemu_log_mask(LOG_GUEST_ERROR, "%s: efuse cache registers are read-only",
     63                   __func__);
     64 }
     65 
     66 static const MemoryRegionOps efuse_cache_ops = {
     67     .read = efuse_cache_read,
     68     .write = efuse_cache_write,
     69     .endianness = DEVICE_LITTLE_ENDIAN,
     70     .valid = {
     71         .min_access_size = 1,
     72         .max_access_size = 4,
     73     },
     74 };
     75 
     76 static void efuse_cache_init(Object *obj)
     77 {
     78     XlnxVersalEFuseCache *s = XLNX_VERSAL_EFUSE_CACHE(obj);
     79     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
     80 
     81     memory_region_init_io(&s->iomem, obj, &efuse_cache_ops, s,
     82                           TYPE_XLNX_VERSAL_EFUSE_CACHE, MR_SIZE);
     83     sysbus_init_mmio(sbd, &s->iomem);
     84 }
     85 
     86 static Property efuse_cache_props[] = {
     87     DEFINE_PROP_LINK("efuse",
     88                      XlnxVersalEFuseCache, efuse,
     89                      TYPE_XLNX_EFUSE, XlnxEFuse *),
     90 
     91     DEFINE_PROP_END_OF_LIST(),
     92 };
     93 
     94 static void efuse_cache_class_init(ObjectClass *klass, void *data)
     95 {
     96     DeviceClass *dc = DEVICE_CLASS(klass);
     97 
     98     device_class_set_props(dc, efuse_cache_props);
     99 }
    100 
    101 static const TypeInfo efuse_cache_info = {
    102     .name          = TYPE_XLNX_VERSAL_EFUSE_CACHE,
    103     .parent        = TYPE_SYS_BUS_DEVICE,
    104     .instance_size = sizeof(XlnxVersalEFuseCache),
    105     .class_init    = efuse_cache_class_init,
    106     .instance_init = efuse_cache_init,
    107 };
    108 
    109 static void efuse_cache_register_types(void)
    110 {
    111     type_register_static(&efuse_cache_info);
    112 }
    113 
    114 type_init(efuse_cache_register_types)