[Qemu-devel] [PATCH 2/8] [MIPS] qdev: convert ds1225y nvram to sysbus device

["Hervé Poussineau" <hpoussin@reactos.org>]

Use it in Jazz emulation
Remove protection stuff, which doesn't belong to this device
Remove ds1225y_init() and ds1225y_set_protection() functions, which are not used anymore

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
---
 hw/ds1225y.c   |  151 ++++++++++++++++++++++++++++++--------------------------
 hw/mips.h      |    4 --
 hw/mips_jazz.c |    4 +-
 3 files changed, 83 insertions(+), 76 deletions(-)

diff --git a/hw/ds1225y.c b/hw/ds1225y.c
index 009d127..046d1ec 100644
--- a/hw/ds1225y.c
+++ b/hw/ds1225y.c
@@ -22,31 +22,34 @@
  * THE SOFTWARE.
  */
 
-#include "hw.h"
-#include "mips.h"
-#include "nvram.h"
+#include "sysbus.h"
 
 //#define DEBUG_NVRAM
 
-typedef struct ds1225y_t
-{
-    uint32_t chip_size;
+#ifdef DEBUG_NVRAM
+#define DPRINTF(fmt, ...)                                       \
+    do { printf("nvram: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) do {} while (0)
+#endif
+
+typedef struct {
+    DeviceState qdev;
+    int32_t chip_size;
+    char* filename;
     QEMUFile *file;
     uint8_t *contents;
-    uint8_t protection;
-} ds1225y_t;
-
+} NvRamState;
 
 static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
 {
-    ds1225y_t *s = opaque;
+    NvRamState *s = opaque;
     uint32_t val;
 
     val = s->contents[addr];
 
-#ifdef DEBUG_NVRAM
-    printf("nvram: read 0x%x at " TARGET_FMT_lx "\n", val, addr);
-#endif
+    DPRINTF("read 0x%x at " TARGET_FMT_plx "\n", val, addr);
+
     return val;
 }
 
@@ -70,11 +73,9 @@ static uint32_t nvram_readl (void *opaque, target_phys_addr_t addr)
 
 static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t val)
 {
-    ds1225y_t *s = opaque;
+    NvRamState *s = opaque;
 
-#ifdef DEBUG_NVRAM
-    printf("nvram: write 0x%x at " TARGET_FMT_lx "\n", val, addr);
-#endif
+    DPRINTF("write 0x%x at " TARGET_FMT_plx "\n", val, addr);
 
     s->contents[addr] = val & 0xff;
     if (s->file) {
@@ -98,34 +99,6 @@ static void nvram_writel (void *opaque, target_phys_addr_t addr, uint32_t val)
     nvram_writeb(opaque, addr + 3, (val >> 24) & 0xff);
 }
 
-static void nvram_writeb_protected (void *opaque, target_phys_addr_t addr, uint32_t val)
-{
-    ds1225y_t *s = opaque;
-
-    if (s->protection != 7) {
-#ifdef DEBUG_NVRAM
-    printf("nvram: prevent write of 0x%x at " TARGET_FMT_lx "\n", val, addr);
-#endif
-        return;
-    }
-
-    nvram_writeb(opaque, addr, val);
-}
-
-static void nvram_writew_protected (void *opaque, target_phys_addr_t addr, uint32_t val)
-{
-    nvram_writeb_protected(opaque, addr, val & 0xff);
-    nvram_writeb_protected(opaque, addr + 1, (val >> 8) & 0xff);
-}
-
-static void nvram_writel_protected (void *opaque, target_phys_addr_t addr, uint32_t val)
-{
-    nvram_writeb_protected(opaque, addr, val & 0xff);
-    nvram_writeb_protected(opaque, addr + 1, (val >> 8) & 0xff);
-    nvram_writeb_protected(opaque, addr + 2, (val >> 16) & 0xff);
-    nvram_writeb_protected(opaque, addr + 3, (val >> 24) & 0xff);
-}
-
 static CPUReadMemoryFunc * const nvram_read[] = {
     &nvram_readb,
     &nvram_readw,
@@ -138,43 +111,81 @@ static CPUWriteMemoryFunc * const nvram_write[] = {
     &nvram_writel,
 };
 
-static CPUWriteMemoryFunc * const nvram_write_protected[] = {
-    &nvram_writeb_protected,
-    &nvram_writew_protected,
-    &nvram_writel_protected,
+static int nvram_post_load(void *opaque, int version_id)
+{
+    NvRamState *s = opaque;
+
+    if (s->file) {
+        qemu_fclose(s->file);
+    }
+
+    /* Write back nvram contents */
+    s->file = qemu_fopen(s->filename, "wb");
+    if (s->file) {
+        /* Write back contents, as 'wb' mode cleaned the file */
+        qemu_put_buffer(s->file, s->contents, s->chip_size);
+        qemu_fflush(s->file);
+    }
+
+    return 0;
+}
+
+static const VMStateDescription vmstate_nvram = {
+    .name = "nvram",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .post_load = nvram_post_load,
+    .fields = (VMStateField []) {
+        VMSTATE_VARRAY_INT32(contents, NvRamState, chip_size, 0, vmstate_info_uint8,
+                             uint8_t),
+        VMSTATE_END_OF_LIST()
+    }
 };
 
-/* Initialisation routine */
-void *ds1225y_init(target_phys_addr_t mem_base, const char *filename)
+typedef struct {
+    SysBusDevice busdev;
+    NvRamState nvram;
+} SysBusNvRamState;
+
+static int nvram_sysbus_initfn(SysBusDevice *dev)
 {
-    ds1225y_t *s;
-    int mem_indexRW, mem_indexRP;
+    NvRamState *s = &FROM_SYSBUS(SysBusNvRamState, dev)->nvram;
     QEMUFile *file;
+    int s_io;
 
-    s = qemu_mallocz(sizeof(ds1225y_t));
-    s->chip_size = 0x2000; /* Fixed for ds1225y chip: 8 KiB */
     s->contents = qemu_mallocz(s->chip_size);
-    s->protection = 7;
+
+    s_io = cpu_register_io_memory(nvram_read, nvram_write, s);
+    sysbus_init_mmio(dev, s->chip_size, s_io);
 
     /* Read current file */
-    file = qemu_fopen(filename, "rb");
+    file = qemu_fopen(s->filename, "rb");
     if (file) {
         /* Read nvram contents */
         qemu_get_buffer(file, s->contents, s->chip_size);
         qemu_fclose(file);
     }
-    s->file = qemu_fopen(filename, "wb");
-    if (s->file) {
-        /* Write back contents, as 'wb' mode cleaned the file */
-        qemu_put_buffer(s->file, s->contents, s->chip_size);
-        qemu_fflush(s->file);
-    }
+    nvram_post_load(s, 0);
 
-    /* Read/write memory */
-    mem_indexRW = cpu_register_io_memory(nvram_read, nvram_write, s);
-    cpu_register_physical_memory(mem_base, s->chip_size, mem_indexRW);
-    /* Read/write protected memory */
-    mem_indexRP = cpu_register_io_memory(nvram_read, nvram_write_protected, s);
-    cpu_register_physical_memory(mem_base + s->chip_size, s->chip_size, mem_indexRP);
-    return s;
+    return 0;
 }
+
+static SysBusDeviceInfo nvram_sysbus_info = {
+    .qdev.name  = "nvram",
+    .qdev.size  = sizeof(SysBusNvRamState),
+    .qdev.vmsd  = &vmstate_nvram,
+    .init       = nvram_sysbus_initfn,
+    .qdev.props = (Property[]) {
+        DEFINE_PROP_INT32("size", SysBusNvRamState, nvram.chip_size, 0x2000),
+        DEFINE_PROP_STRING("filename", SysBusNvRamState, nvram.filename),
+        DEFINE_PROP_END_OF_LIST(),
+    },
+};
+
+static void nvram_register(void)
+{
+    sysbus_register_withprop(&nvram_sysbus_info);
+}
+
+device_init(nvram_register)
diff --git a/hw/mips.h b/hw/mips.h
index 617ea10..8f32ba0 100644
--- a/hw/mips.h
+++ b/hw/mips.h
@@ -8,10 +8,6 @@ PCIBus *pci_gt64120_init(qemu_irq *pic);
 /* bonito.c */
 PCIBus *bonito_init(qemu_irq *pic);
 
-/* ds1225y.c */
-void *ds1225y_init(target_phys_addr_t mem_base, const char *filename);
-void ds1225y_set_protection(void *opaque, int protection);
-
 /* g364fb.c */
 int g364fb_mm_init(target_phys_addr_t vram_base,
                    target_phys_addr_t ctrl_base, int it_shift,
diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
index e306839..06968d3 100644
--- a/hw/mips_jazz.c
+++ b/hw/mips_jazz.c
@@ -290,8 +290,8 @@ void mips_jazz_init (ram_addr_t ram_size,
     /* FIXME: missing Jazz sound at 0x8000c000, rc4030[2] */
     audio_init(i8259);
 
-    /* NVRAM: Unprotected at 0x9000, Protected at 0xa000, Read only at 0xb000 */
-    ds1225y_init(0x80009000, "nvram");
+    /* NVRAM */
+    sysbus_create_simple("nvram", 0x80009000, NULL);
 
     /* LED indicator */
     jazz_led_init(0x8000f000);
-- 
1.7.1.GIT