diff options
| author | ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162> | 2007-02-28 21:36:41 +0000 |
|---|---|---|
| committer | ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162> | 2007-02-28 21:36:41 +0000 |
| commit | 9542611a66227ceca062eec86d49e17aa79cbf90 (patch) | |
| tree | f0e10f06ad4b7b15987d54e10184b287ffe5ce1a /hw/ds1225y.c | |
| parent | c5be9f0898b92d0d6bfb458fd50fc170f4300361 (diff) | |
DS1225Y nvram device, by Herve Poussineau.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2460 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/ds1225y.c')
| -rw-r--r-- | hw/ds1225y.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/hw/ds1225y.c b/hw/ds1225y.c new file mode 100644 index 0000000000..48d6636b3c --- /dev/null +++ b/hw/ds1225y.c @@ -0,0 +1,121 @@ +/*
+ * QEMU NVRAM emulation for DS1225Y chip
+ *
+ * Copyright (c) 2007 Hervé Poussineau
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "vl.h"
+
+typedef enum
+{
+ none = 0,
+ readmode,
+ writemode,
+} nvram_open_mode;
+
+struct ds1225y_t
+{
+ target_ulong mem_base;
+ uint32_t capacity;
+ const char *filename;
+ QEMUFile *file;
+ nvram_open_mode open_mode;
+};
+
+static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode)
+{
+ if (NVRAM->open_mode != mode)
+ {
+ if (NVRAM->file)
+ qemu_fclose(NVRAM->file);
+ NVRAM->file = qemu_fopen(NVRAM->filename, filemode);
+ NVRAM->open_mode = mode;
+ }
+ return (NVRAM->file != NULL);
+}
+
+static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
+{
+ ds1225y_t *NVRAM = opaque;
+ int64_t pos;
+
+ pos = addr - NVRAM->mem_base;
+ if (addr >= NVRAM->capacity)
+ addr -= NVRAM->capacity;
+
+ if (!ds1225y_set_to_mode(NVRAM, readmode, "rb"))
+ return 0;
+ qemu_fseek(NVRAM->file, pos, SEEK_SET);
+ return (uint32_t)qemu_get_byte(NVRAM->file);
+}
+
+static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
+{
+ ds1225y_t *NVRAM = opaque;
+ int64_t pos;
+
+ pos = addr - NVRAM->mem_base;
+ if (ds1225y_set_to_mode(NVRAM, writemode, "wb"))
+ {
+ qemu_fseek(NVRAM->file, pos, SEEK_SET);
+ qemu_put_byte(NVRAM->file, (int)value);
+ }
+}
+
+static CPUReadMemoryFunc *nvram_read[] = {
+ &nvram_readb,
+ NULL,
+ NULL,
+};
+
+static CPUWriteMemoryFunc *nvram_write[] = {
+ &nvram_writeb,
+ NULL,
+ NULL,
+};
+
+static CPUWriteMemoryFunc *nvram_none[] = {
+ NULL,
+ NULL,
+ NULL,
+};
+
+/* Initialisation routine */
+ds1225y_t *ds1225y_init(target_ulong mem_base, const char *filename)
+{
+ ds1225y_t *s;
+ int mem_index1, mem_index2;
+
+ s = qemu_mallocz(sizeof(ds1225y_t));
+ if (!s)
+ return NULL;
+ s->mem_base = mem_base;
+ s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */
+ s->filename = filename;
+
+ /* Read/write memory */
+ mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s);
+ cpu_register_physical_memory(mem_base, s->capacity, mem_index1);
+ /* Read-only memory */
+ mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s);
+ cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2);
+ return s;
+}
|