hw/arm/aspeed: Add machine properties to define the flash models

Some machines don't have much differences a part from the flash model
being used. Introduce new machine properties to change them from the
command line.

For instance, to start the ast2500-evb machine with a different FMC
chip and a 64M SPI chip, use :

  -M ast2500-evb,fmc-model=mx25l25635e,spi-model=mx66u51235f

Cc: 郁雷 <yulei.sh@bytedance.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Lei YU <yulei.sh@bytedance.com>
Message-Id: <20200915054859.2338477-1-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

docs/system/arm/aspeed.rst

@@ -83,3 +83,21 @@ The image should be attached as an MTD drive. Run :
 
   $ qemu-system-arm -M romulus-bmc -nic user \
 	-drive file=flash-romulus,format=raw,if=mtd -nographic
+
+Options specific to Aspeed machines are :
+
+ * ``execute-in-place`` which emulates the boot from the CE0 flash
+   device by using the FMC controller to load the instructions, and
+   not simply from RAM. This takes a little longer.
+
+ * ``fmc-model`` to change the FMC Flash model. FW needs support for
+   the chip model to boot.
+
+ * ``spi-model`` to change the SPI Flash model.
+
+For instance, to start the ``ast2500-evb`` machine with a different
+FMC chip and a bigger (64M) SPI chip, use :
+
+.. code-block:: bash
+
+  -M ast2500-evb,fmc-model=mx25l25635e,spi-model=mx66u51235f

hw/arm/aspeed.c

@@ -41,6 +41,8 @@ struct AspeedMachineState {
     MemoryRegion ram_container;
     MemoryRegion max_ram;
     bool mmio_exec;
+    char *fmc_model;
+    char *spi_model;
 };
 
 /* Palmetto hardware value: 0x120CE416 */
@@ -332,8 +334,10 @@ static void aspeed_machine_init(MachineState *machine)
                           "max_ram", max_ram_size  - ram_size);
     memory_region_add_subregion(&bmc->ram_container, ram_size, &bmc->max_ram);
 
-    aspeed_board_init_flashes(&bmc->soc.fmc, amc->fmc_model);
+    aspeed_board_init_flashes(&bmc->soc.fmc, bmc->fmc_model ?
-    aspeed_board_init_flashes(&bmc->soc.spi[0], amc->spi_model);
+                              bmc->fmc_model : amc->fmc_model);
+    aspeed_board_init_flashes(&bmc->soc.spi[0], bmc->spi_model ?
+                              bmc->spi_model : amc->spi_model);
 
     /* Install first FMC flash content as a boot rom. */
     if (drive0) {
@@ -570,6 +574,34 @@ static void aspeed_machine_instance_init(Object *obj)
     ASPEED_MACHINE(obj)->mmio_exec = false;
 }
 
+static char *aspeed_get_fmc_model(Object *obj, Error **errp)
+{
+    AspeedMachineState *bmc = ASPEED_MACHINE(obj);
+    return g_strdup(bmc->fmc_model);
+}
+
+static void aspeed_set_fmc_model(Object *obj, const char *value, Error **errp)
+{
+    AspeedMachineState *bmc = ASPEED_MACHINE(obj);
+
+    g_free(bmc->fmc_model);
+    bmc->fmc_model = g_strdup(value);
+}
+
+static char *aspeed_get_spi_model(Object *obj, Error **errp)
+{
+    AspeedMachineState *bmc = ASPEED_MACHINE(obj);
+    return g_strdup(bmc->spi_model);
+}
+
+static void aspeed_set_spi_model(Object *obj, const char *value, Error **errp)
+{
+    AspeedMachineState *bmc = ASPEED_MACHINE(obj);
+
+    g_free(bmc->spi_model);
+    bmc->spi_model = g_strdup(value);
+}
+
 static void aspeed_machine_class_props_init(ObjectClass *oc)
 {
     object_class_property_add_bool(oc, "execute-in-place",
@@ -577,6 +609,15 @@ static void aspeed_machine_class_props_init(ObjectClass *oc)
                                    aspeed_set_mmio_exec);
     object_class_property_set_description(oc, "execute-in-place",
                            "boot directly from CE0 flash device");
+
+    object_class_property_add_str(oc, "fmc-model", aspeed_get_fmc_model,
+                                   aspeed_set_fmc_model);
+    object_class_property_set_description(oc, "fmc-model",
+                                          "Change the FMC Flash model");
+    object_class_property_add_str(oc, "spi-model", aspeed_get_spi_model,
+                                   aspeed_set_spi_model);
+    object_class_property_set_description(oc, "spi-model",
+                                          "Change the SPI Flash model");
 }
 
 static int aspeed_soc_num_cpus(const char *soc_name)