m25p80.c: Use QOM classes for part differentiation

Currently, M25P80 uses an object property to differentiate between flash parts.
Changed this over to use QOM sub-classes - the actual names of the different parts
are used to create a set of dynamic classes which passes the part info as class
data. The object no longer needs to search the known_devices table for itself,
instead it just gets its info from its own class.

Kept the intermediate class definition private to m25p80.c for the moment, as
the expectation is parts will only be added as new entries in the table. We can
factor out the TYPE_M25P80 abstraction into a header on a demand basis.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: e24e156d-ff96-4901-997a-e31178b08bee@VA3EHSMHS021.ehs.local
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

3 files changed, 33 insertions, 31 deletions

diff --git a/hw/m25p80.c b/hw/m25p80.c
index 461b41c4ac..1372d06409 100644
--- a/hw/m25p80.c
+++ b/hw/m25p80.c
@@ -178,8 +178,6 @@ static const FlashPartInfo known_devices[] = {
 
     /* Numonyx -- n25q128 */
     { INFO("n25q128",      0x20ba18,      0,  64 << 10, 256, 0) },
-
-    { },
 };
 
 typedef enum {
@@ -236,11 +234,23 @@ typedef struct Flash {
 
     int64_t dirty_page;
 
-    char *part_name;
     const FlashPartInfo *pi;
 
 } Flash;
 
+typedef struct M25P80Class {
+    SSISlaveClass parent_class;
+    FlashPartInfo *pi;
+} M25P80Class;
+
+#define TYPE_M25P80 "m25p80-generic"
+#define M25P80(obj) \
+     OBJECT_CHECK(Flash, (obj), TYPE_M25P80)
+#define M25P80_CLASS(klass) \
+     OBJECT_CLASS_CHECK(M25P80Class, (klass), TYPE_M25P80)
+#define M25P80_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(M25P80Class, (obj), TYPE_M25P80)
+
 static void bdrv_sync_complete(void *opaque, int ret)
 {
     /* do nothing. Masters do not directly interact with the backing store,
@@ -571,23 +581,9 @@ static int m25p80_init(SSISlave *ss)
 {
     DriveInfo *dinfo;
     Flash *s = FROM_SSI_SLAVE(Flash, ss);
-    const FlashPartInfo *i;
+    M25P80Class *mc = M25P80_GET_CLASS(s);
 
-    if (!s->part_name) { /* default to actual m25p80 if no partname given */
-        s->part_name = (char *)"m25p80";
-    }
-
-    i = known_devices;
-    for (i = known_devices;; i++) {
-        assert(i);
-        if (!i->part_name) {
-            fprintf(stderr, "Unknown SPI flash part: \"%s\"\n", s->part_name);
-            return 1;
-        } else if (!strcmp(i->part_name, s->part_name)) {
-            s->pi = i;
-            break;
-        }
-    }
+    s->pi = mc->pi;
 
     s->size = s->pi->sector_size * s->pi->n_sectors;
     s->dirty_page = -1;
@@ -635,34 +631,42 @@ static const VMStateDescription vmstate_m25p80 = {
     }
 };
 
-static Property m25p80_properties[] = {
-    DEFINE_PROP_STRING("partname", Flash, part_name),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
 static void m25p80_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
+    M25P80Class *mc = M25P80_CLASS(klass);
 
     k->init = m25p80_init;
     k->transfer = m25p80_transfer8;
     k->set_cs = m25p80_cs;
     k->cs_polarity = SSI_CS_LOW;
-    dc->props = m25p80_properties;
     dc->vmsd = &vmstate_m25p80;
+    mc->pi = data;
 }
 
 static const TypeInfo m25p80_info = {
-    .name           = "m25p80",
+    .name           = TYPE_M25P80,
     .parent         = TYPE_SSI_SLAVE,
     .instance_size  = sizeof(Flash),
-    .class_init     = m25p80_class_init,
+    .class_size     = sizeof(M25P80Class),
+    .abstract       = true,
 };
 
 static void m25p80_register_types(void)
 {
+    int i;
+
     type_register_static(&m25p80_info);
+    for (i = 0; i < ARRAY_SIZE(known_devices); ++i) {
+        TypeInfo ti = {
+            .name       = known_devices[i].part_name,
+            .parent     = TYPE_M25P80,
+            .class_init = m25p80_class_init,
+            .class_data = (void *)&known_devices[i],
+        };
+        type_register(&ti);
+    }
 }
 
 type_init(m25p80_register_types)
diff --git a/hw/petalogix_ml605_mmu.c b/hw/petalogix_ml605_mmu.c
index 82d7183ae5..fe7a932009 100644
--- a/hw/petalogix_ml605_mmu.c
+++ b/hw/petalogix_ml605_mmu.c
@@ -158,8 +158,7 @@ petalogix_ml605_init(QEMUMachineInitArgs *args)
         for (i = 0; i < NUM_SPI_FLASHES; i++) {
             qemu_irq cs_line;
 
-            dev = ssi_create_slave_no_init(spi, "m25p80");
-            qdev_prop_set_string(dev, "partname", "n25q128");
+            dev = ssi_create_slave_no_init(spi, "n25q128");
             qdev_init_nofail(dev);
             cs_line = qdev_get_gpio_in(dev, 0);
             sysbus_connect_irq(busdev, i+1, cs_line);
diff --git a/hw/xilinx_zynq.c b/hw/xilinx_zynq.c
index 39d9fb3e73..2f67d90ee1 100644
--- a/hw/xilinx_zynq.c
+++ b/hw/xilinx_zynq.c
@@ -82,8 +82,7 @@ static inline void zynq_init_spi_flashes(uint32_t base_addr, qemu_irq irq,
         spi = (SSIBus *)qdev_get_child_bus(dev, bus_name);
 
         for (j = 0; j < num_ss; ++j) {
-            flash_dev = ssi_create_slave_no_init(spi, "m25p80");
-            qdev_prop_set_string(flash_dev, "partname", "n25q128");
+            flash_dev = ssi_create_slave_no_init(spi, "n25q128");
             qdev_init_nofail(flash_dev);
 
             cs_line = qdev_get_gpio_in(flash_dev, 0);