[PATCH v5 6/6] hw/ppc/e500: Add Freescale eSDHC to e500plat

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

From: Bernhard Beschow <shentey@gmail.com>

Adds missing functionality to e500plat machine which increases the
chance of given "real" firmware images to access SD cards.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Message-Id: <20221018210146.193159-8-shentey@gmail.com>
[PMD: Simplify using create_unimplemented_device("esdhc")]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 docs/system/ppc/ppce500.rst | 12 ++++++++++
 hw/ppc/Kconfig              |  2 ++
 hw/ppc/e500.c               | 48 ++++++++++++++++++++++++++++++++++++-
 hw/ppc/e500.h               |  1 +
 hw/ppc/e500plat.c           |  1 +
 5 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/docs/system/ppc/ppce500.rst b/docs/system/ppc/ppce500.rst
index 38f8ceb0cf..c9fe0915dc 100644
--- a/docs/system/ppc/ppce500.rst
+++ b/docs/system/ppc/ppce500.rst
@@ -19,6 +19,7 @@ The ``ppce500`` machine supports the following devices:
 * Power-off functionality via one GPIO pin
 * 1 Freescale MPC8xxx PCI host controller
 * VirtIO devices via PCI bus
+* 1 Freescale Enhanced Secure Digital Host controller (eSDHC)
 * 1 Freescale Enhanced Triple Speed Ethernet controller (eTSEC)
 
 Hardware configuration information
@@ -181,3 +182,14 @@ as follows:
       -drive if=pflash,file=/path/to/rootfs.ext2,format=raw \
       -append "rootwait root=/dev/mtdblock0"
 
+Alternatively, the root file system can also reside on an emulated SD card
+whose size must again be a power of two:
+
+.. code-block:: bash
+
+  $ qemu-system-ppc64 -M ppce500 -cpu e500mc -smp 4 -m 2G \
+      -display none -serial stdio \
+      -kernel vmlinux \
+      -device sd-card,drive=mydrive \
+      -drive id=mydrive,if=none,file=/path/to/rootfs.ext2,format=raw \
+      -append "rootwait root=/dev/mmcblk0"
diff --git a/hw/ppc/Kconfig b/hw/ppc/Kconfig
index 769a1ead1c..c48aaaa9dc 100644
--- a/hw/ppc/Kconfig
+++ b/hw/ppc/Kconfig
@@ -129,10 +129,12 @@ config E500
     select PFLASH_CFI01
     select PLATFORM_BUS
     select PPCE500_PCI
+    select SDHCI
     select SERIAL
     select MPC_I2C
     select FDT_PPC
     select DS1338
+    select UNIMP
 
 config E500PLAT
     bool
diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
index 84bcc25526..80e4c4c4ca 100644
--- a/hw/ppc/e500.c
+++ b/hw/ppc/e500.c
@@ -48,6 +48,8 @@
 #include "hw/net/fsl_etsec/etsec.h"
 #include "hw/i2c/i2c.h"
 #include "hw/irq.h"
+#include "hw/sd/sdhci.h"
+#include "hw/misc/unimp.h"
 
 #define EPAPR_MAGIC                (0x45504150)
 #define DTC_LOAD_PAD               0x1800000
@@ -66,11 +68,14 @@
 #define MPC8544_SERIAL1_REGS_OFFSET 0x4600ULL
 #define MPC8544_PCI_REGS_OFFSET    0x8000ULL
 #define MPC8544_PCI_REGS_SIZE      0x1000ULL
+#define MPC85XX_ESDHC_REGS_OFFSET  0x2e000ULL
+#define MPC85XX_ESDHC_REGS_SIZE    0x1000ULL
 #define MPC8544_UTIL_OFFSET        0xe0000ULL
 #define MPC8XXX_GPIO_OFFSET        0x000FF000ULL
 #define MPC8544_I2C_REGS_OFFSET    0x3000ULL
 #define MPC8XXX_GPIO_IRQ           47
 #define MPC8544_I2C_IRQ            43
+#define MPC85XX_ESDHC_IRQ          72
 #define RTC_REGS_OFFSET            0x68
 
 #define PLATFORM_CLK_FREQ_HZ       (400 * 1000 * 1000)
@@ -203,6 +208,22 @@ static void dt_i2c_create(void *fdt, const char *soc, const char *mpic,
     g_free(i2c);
 }
 
+static void dt_sdhc_create(void *fdt, const char *parent, const char *mpic)
+{
+    hwaddr mmio = MPC85XX_ESDHC_REGS_OFFSET;
+    hwaddr size = MPC85XX_ESDHC_REGS_SIZE;
+    int irq = MPC85XX_ESDHC_IRQ;
+    g_autofree char *name = NULL;
+
+    name = g_strdup_printf("%s/sdhc@%" PRIx64, parent, mmio);
+    qemu_fdt_add_subnode(fdt, name);
+    qemu_fdt_setprop(fdt, name, "sdhci,auto-cmd12", NULL, 0);
+    qemu_fdt_setprop_phandle(fdt, name, "interrupt-parent", mpic);
+    qemu_fdt_setprop_cells(fdt, name, "bus-width", 4);
+    qemu_fdt_setprop_cells(fdt, name, "interrupts", irq, 0x2);
+    qemu_fdt_setprop_cells(fdt, name, "reg", mmio, size);
+    qemu_fdt_setprop_string(fdt, name, "compatible", "fsl,esdhc");
+}
 
 typedef struct PlatformDevtreeData {
     void *fdt;
@@ -553,6 +574,10 @@ static int ppce500_load_device_tree(PPCE500MachineState *pms,
 
     dt_rtc_create(fdt, "i2c", "rtc");
 
+    /* sdhc */
+    if (pmc->has_esdhc) {
+        dt_sdhc_create(fdt, soc, mpic);
+    }
 
     gutil = g_strdup_printf("%s/global-utilities@%llx", soc,
                             MPC8544_UTIL_OFFSET);
@@ -982,7 +1007,8 @@ void ppce500_init(MachineState *machine)
                        0, qdev_get_gpio_in(mpicdev, 42), 399193,
                        serial_hd(1), DEVICE_BIG_ENDIAN);
     }
-        /* I2C */
+
+    /* I2C */
     dev = qdev_new("mpc-i2c");
     s = SYS_BUS_DEVICE(dev);
     sysbus_realize_and_unref(s, &error_fatal);
@@ -992,6 +1018,26 @@ void ppce500_init(MachineState *machine)
     i2c = (I2CBus *)qdev_get_child_bus(dev, "i2c");
     i2c_slave_create_simple(i2c, "ds1338", RTC_REGS_OFFSET);
 
+    /* eSDHC */
+    if (pmc->has_esdhc) {
+        uint64_t sdhci_regsize;
+
+        dev = qdev_new(TYPE_SYSBUS_SDHCI);
+        /*
+         * Compatible with:
+         * - SD Host Controller Specification Version 2.0 Part A2
+         */
+        qdev_prop_set_uint8(dev, "sd-spec-version", 2);
+        s = SYS_BUS_DEVICE(dev);
+        sysbus_realize_and_unref(s, &error_fatal);
+        sysbus_mmio_map(s, 0, pmc->ccsrbar_base + MPC85XX_ESDHC_REGS_OFFSET);
+        sysbus_connect_irq(s, 0, qdev_get_gpio_in(mpicdev, MPC85XX_ESDHC_IRQ));
+        sdhci_regsize = memory_region_size(sysbus_mmio_get_region(s, 0));
+        create_unimplemented_device("esdhc",
+                                    pmc->ccsrbar_base
+                                    + MPC85XX_ESDHC_REGS_OFFSET + sdhci_regsize,
+                                    MPC85XX_ESDHC_REGS_SIZE - sdhci_regsize);
+    }
 
     /* General Utility device */
     dev = qdev_new("mpc8544-guts");
diff --git a/hw/ppc/e500.h b/hw/ppc/e500.h
index 68f754ce50..8c09ef92e4 100644
--- a/hw/ppc/e500.h
+++ b/hw/ppc/e500.h
@@ -27,6 +27,7 @@ struct PPCE500MachineClass {
 
     int mpic_version;
     bool has_mpc8xxx_gpio;
+    bool has_esdhc;
     hwaddr platform_bus_base;
     hwaddr platform_bus_size;
     int platform_bus_first_irq;
diff --git a/hw/ppc/e500plat.c b/hw/ppc/e500plat.c
index 5bb1c603da..44bf874b0f 100644
--- a/hw/ppc/e500plat.c
+++ b/hw/ppc/e500plat.c
@@ -86,6 +86,7 @@ static void e500plat_machine_class_init(ObjectClass *oc, void *data)
     pmc->fixup_devtree = e500plat_fixup_devtree;
     pmc->mpic_version = OPENPIC_MODEL_FSL_MPIC_42;
     pmc->has_mpc8xxx_gpio = true;
+    pmc->has_esdhc = true;
     pmc->platform_bus_base = 0xf00000000ULL;
     pmc->platform_bus_size = 128 * MiB;
     pmc->platform_bus_first_irq = 5;
-- 
2.37.3