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authorCédric Le Goater2019-10-21 15:12:11 +0200
committerDavid Gibson2019-12-17 00:39:47 +0100
commit35dde5766211cac0e608b29b3f71922f116b5932 (patch)
treed30d9e4af9f39d6f1b81951b7cb59d2be5f2565c /hw/ppc/pnv_pnor.c
parentMerge remote-tracking branch 'remotes/amarkovic/tags/mips-queue-dec-16-2019' ... (diff)
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ppc/pnv: Add a PNOR model
On a POWERPC PowerNV system, the host firmware is stored in a PNOR flash chip which contents is mapped on the LPC bus. This model adds a simple dummy device to map the contents of a block device in the host address space. Signed-off-by: Cédric Le Goater <clg@kaod.org> Message-Id: <20191021131215.3693-2-clg@kaod.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'hw/ppc/pnv_pnor.c')
-rw-r--r--hw/ppc/pnv_pnor.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/hw/ppc/pnv_pnor.c b/hw/ppc/pnv_pnor.c
new file mode 100644
index 0000000000..bfb1e92b03
--- /dev/null
+++ b/hw/ppc/pnv_pnor.c
@@ -0,0 +1,135 @@
+/*
+ * QEMU PowerNV PNOR simple model
+ *
+ * Copyright (c) 2015-2019, IBM Corporation.
+ *
+ * This code is licensed under the GPL version 2 or later. See the
+ * COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "qemu/log.h"
+#include "sysemu/block-backend.h"
+#include "sysemu/blockdev.h"
+#include "hw/loader.h"
+#include "hw/ppc/pnv_pnor.h"
+#include "hw/qdev-properties.h"
+
+static uint64_t pnv_pnor_read(void *opaque, hwaddr addr, unsigned size)
+{
+ PnvPnor *s = PNV_PNOR(opaque);
+ uint64_t ret = 0;
+ int i;
+
+ for (i = 0; i < size; i++) {
+ ret |= (uint64_t) s->storage[addr + i] << (8 * (size - i - 1));
+ }
+
+ return ret;
+}
+
+static void pnv_pnor_update(PnvPnor *s, int offset, int size)
+{
+ int offset_end;
+
+ if (s->blk) {
+ return;
+ }
+
+ offset_end = offset + size;
+ offset = QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE);
+ offset_end = QEMU_ALIGN_UP(offset_end, BDRV_SECTOR_SIZE);
+
+ blk_pwrite(s->blk, offset, s->storage + offset,
+ offset_end - offset, 0);
+}
+
+static void pnv_pnor_write(void *opaque, hwaddr addr, uint64_t data,
+ unsigned size)
+{
+ PnvPnor *s = PNV_PNOR(opaque);
+ int i;
+
+ for (i = 0; i < size; i++) {
+ s->storage[addr + i] = (data >> (8 * (size - i - 1))) & 0xFF;
+ }
+ pnv_pnor_update(s, addr, size);
+}
+
+/*
+ * TODO: Check endianness: skiboot is BIG, Aspeed AHB is LITTLE, flash
+ * is BIG.
+ */
+static const MemoryRegionOps pnv_pnor_ops = {
+ .read = pnv_pnor_read,
+ .write = pnv_pnor_write,
+ .endianness = DEVICE_BIG_ENDIAN,
+ .valid = {
+ .min_access_size = 1,
+ .max_access_size = 4,
+ },
+};
+
+static void pnv_pnor_realize(DeviceState *dev, Error **errp)
+{
+ PnvPnor *s = PNV_PNOR(dev);
+ int ret;
+
+ if (s->blk) {
+ uint64_t perm = BLK_PERM_CONSISTENT_READ |
+ (blk_is_read_only(s->blk) ? 0 : BLK_PERM_WRITE);
+ ret = blk_set_perm(s->blk, perm, BLK_PERM_ALL, errp);
+ if (ret < 0) {
+ return;
+ }
+
+ s->size = blk_getlength(s->blk);
+ if (s->size <= 0) {
+ error_setg(errp, "failed to get flash size");
+ return;
+ }
+
+ s->storage = blk_blockalign(s->blk, s->size);
+
+ if (blk_pread(s->blk, 0, s->storage, s->size) != s->size) {
+ error_setg(errp, "failed to read the initial flash content");
+ return;
+ }
+ } else {
+ s->storage = blk_blockalign(NULL, s->size);
+ memset(s->storage, 0xFF, s->size);
+ }
+
+ memory_region_init_io(&s->mmio, OBJECT(s), &pnv_pnor_ops, s,
+ TYPE_PNV_PNOR, s->size);
+}
+
+static Property pnv_pnor_properties[] = {
+ DEFINE_PROP_UINT32("size", PnvPnor, size, 128 << 20),
+ DEFINE_PROP_DRIVE("drive", PnvPnor, blk),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pnv_pnor_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->realize = pnv_pnor_realize;
+ dc->props = pnv_pnor_properties;
+}
+
+static const TypeInfo pnv_pnor_info = {
+ .name = TYPE_PNV_PNOR,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(PnvPnor),
+ .class_init = pnv_pnor_class_init,
+};
+
+static void pnv_pnor_register_types(void)
+{
+ type_register_static(&pnv_pnor_info);
+}
+
+type_init(pnv_pnor_register_types)