hw/riscv: microchip_pfsoc: Connect a Cadence SDHCI controller and an SD card

Microchip PolarFire SoC integrates one Cadence SDHCI controller.
On the Icicle Kit board, one eMMC chip and an external SD card
connect to this controller depending on different configuration.

As QEMU does not support eMMC yet, we just emulate the SD card
configuration. To test this, the Hart Software Services (HSS)
should choose the SD card configuration:

$ cp boards/icicle-kit-es/def_config.sdcard .config
$ make BOARD=icicle-kit-es

The SD card image can be built from the Yocto BSP at:
https://github.com/polarfire-soc/meta-polarfire-soc-yocto-bsp

Note the generated SD card image should be resized before use:
$ qemu-img resize /path/to/sdcard.img 4G

Launch QEMU with the following command:
$ qemu-system-riscv64 -nographic -M microchip-icicle-kit -sd sdcard.img

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <1598924352-89526-9-git-send-email-bmeng.cn@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

hw/riscv/Kconfig

@@ -55,3 +55,4 @@ config MICROCHIP_PFSOC
     select SIFIVE
     select UNIMP
     select MCHP_PFSOC_MMUART
+    select CADENCE_SDHCI

hw/riscv/microchip_pfsoc.c

@@ -12,6 +12,7 @@
  * 1) PLIC (Platform Level Interrupt Controller)
  * 2) eNVM (Embedded Non-Volatile Memory)
  * 3) MMUARTs (Multi-Mode UART)
+ * 4) Cadence eMMC/SDHC controller and an SD card connected to it
  *
  * This board currently generates devicetree dynamically that indicates at least
  * two harts and up to five harts.
@@ -75,6 +76,7 @@ static const struct MemmapEntry {
     [MICROCHIP_PFSOC_MMUART0] =         { 0x20000000,     0x1000 },
     [MICROCHIP_PFSOC_SYSREG] =          { 0x20002000,     0x2000 },
     [MICROCHIP_PFSOC_MPUCFG] =          { 0x20005000,     0x1000 },
+    [MICROCHIP_PFSOC_EMMC_SD] =         { 0x20008000,     0x1000 },
     [MICROCHIP_PFSOC_MMUART1] =         { 0x20100000,     0x1000 },
     [MICROCHIP_PFSOC_MMUART2] =         { 0x20102000,     0x1000 },
     [MICROCHIP_PFSOC_MMUART3] =         { 0x20104000,     0x1000 },
@@ -111,6 +113,9 @@ static void microchip_pfsoc_soc_instance_init(Object *obj)
     qdev_prop_set_string(DEVICE(&s->u_cpus), "cpu-type",
                          TYPE_RISCV_CPU_SIFIVE_U54);
     qdev_prop_set_uint64(DEVICE(&s->u_cpus), "resetvec", RESET_VECTOR);
+
+    object_initialize_child(obj, "sd-controller", &s->sdhci,
+                            TYPE_CADENCE_SDHCI);
 }
 
 static void microchip_pfsoc_soc_realize(DeviceState *dev, Error **errp)
@@ -223,6 +228,13 @@ static void microchip_pfsoc_soc_realize(DeviceState *dev, Error **errp)
         memmap[MICROCHIP_PFSOC_MPUCFG].base,
         memmap[MICROCHIP_PFSOC_MPUCFG].size);
 
+    /* SDHCI */
+    sysbus_realize(SYS_BUS_DEVICE(&s->sdhci), errp);
+    sysbus_mmio_map(SYS_BUS_DEVICE(&s->sdhci), 0,
+                    memmap[MICROCHIP_PFSOC_EMMC_SD].base);
+    sysbus_connect_irq(SYS_BUS_DEVICE(&s->sdhci), 0,
+        qdev_get_gpio_in(DEVICE(s->plic), MICROCHIP_PFSOC_EMMC_SD_IRQ));
+
     /* MMUARTs */
     s->serial0 = mchp_pfsoc_mmuart_create(system_memory,
         memmap[MICROCHIP_PFSOC_MMUART0].base,
@@ -290,6 +302,7 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
     MicrochipIcicleKitState *s = MICROCHIP_ICICLE_KIT_MACHINE(machine);
     MemoryRegion *system_memory = get_system_memory();
     MemoryRegion *main_mem = g_new(MemoryRegion, 1);
+    DriveInfo *dinfo = drive_get_next(IF_SD);
 
     /* Sanity check on RAM size */
     if (machine->ram_size < mc->default_ram_size) {
@@ -312,6 +325,16 @@ static void microchip_icicle_kit_machine_init(MachineState *machine)
 
     /* Load the firmware */
     riscv_find_and_load_firmware(machine, BIOS_FILENAME, RESET_VECTOR, NULL);
+
+    /* Attach an SD card */
+    if (dinfo) {
+        CadenceSDHCIState *sdhci = &(s->soc.sdhci);
+        DeviceState *card = qdev_new(TYPE_SD_CARD);
+
+        qdev_prop_set_drive_err(card, "drive", blk_by_legacy_dinfo(dinfo),
+                                &error_fatal);
+        qdev_realize_and_unref(card, sdhci->bus, &error_fatal);
+    }
 }
 
 static void microchip_icicle_kit_machine_class_init(ObjectClass *oc, void *data)

include/hw/riscv/microchip_pfsoc.h

@@ -23,6 +23,7 @@
 #define HW_MICROCHIP_PFSOC_H
 
 #include "hw/char/mchp_pfsoc_mmuart.h"
+#include "hw/sd/cadence_sdhci.h"
 
 typedef struct MicrochipPFSoCState {
     /*< private >*/
@@ -39,6 +40,7 @@ typedef struct MicrochipPFSoCState {
     MchpPfSoCMMUartState *serial2;
     MchpPfSoCMMUartState *serial3;
     MchpPfSoCMMUartState *serial4;
+    CadenceSDHCIState sdhci;
 } MicrochipPFSoCState;
 
 #define TYPE_MICROCHIP_PFSOC    "microchip.pfsoc"
@@ -74,6 +76,7 @@ enum {
     MICROCHIP_PFSOC_MMUART0,
     MICROCHIP_PFSOC_SYSREG,
     MICROCHIP_PFSOC_MPUCFG,
+    MICROCHIP_PFSOC_EMMC_SD,
     MICROCHIP_PFSOC_MMUART1,
     MICROCHIP_PFSOC_MMUART2,
     MICROCHIP_PFSOC_MMUART3,
@@ -85,6 +88,7 @@ enum {
 };
 
 enum {
+    MICROCHIP_PFSOC_EMMC_SD_IRQ = 88,
     MICROCHIP_PFSOC_MMUART0_IRQ = 90,
     MICROCHIP_PFSOC_MMUART1_IRQ = 91,
     MICROCHIP_PFSOC_MMUART2_IRQ = 92,