[v3,17/30] i.MX: Add code to emulate i.MX7 IOMUXC IP block

Commit Message

Andrey Smirnov Nov. 6, 2017, 3:48 p.m. UTC

Add minimal code needed to allow upstream Linux guest to boot.

Cc: Peter Maydell <[e-mail]>
Cc: Jason Wang <[e-mail]>
Cc: Philippe Mathieu-Daudé <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Andrey Smirnov <[e-mail]>
---
 hw/misc/Makefile.objs         |  1 +
 hw/misc/imx7_iomuxc.c         | 99 +++++++++++++++++++++++++++++++++++++++++++
 include/hw/misc/imx7_iomuxc.h | 22 ++++++++++
 3 files changed, 122 insertions(+)
 create mode 100644 hw/misc/imx7_iomuxc.c
 create mode 100644 include/hw/misc/imx7_iomuxc.h

Patch

diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
index 16cee88e0f..492c535330 100644
--- a/hw/misc/Makefile.objs
+++ b/hw/misc/Makefile.objs
@@ -37,6 +37,7 @@  obj-$(CONFIG_IMX) += imx6_src.o
 obj-$(CONFIG_IMX) += imx7_ccm.o
 obj-$(CONFIG_IMX) += imx2_wdt.o
 obj-$(CONFIG_IMX) += imx7_snvs.o
+obj-$(CONFIG_IMX) += imx7_iomuxc.o
 obj-$(CONFIG_MILKYMIST) += milkymist-hpdmc.o
 obj-$(CONFIG_MILKYMIST) += milkymist-pfpu.o
 obj-$(CONFIG_MAINSTONE) += mst_fpga.o
diff --git a/hw/misc/imx7_iomuxc.c b/hw/misc/imx7_iomuxc.c
new file mode 100644
index 0000000000..aa26a7485f
--- /dev/null
+++ b/hw/misc/imx7_iomuxc.c
@@ -0,0 +1,99 @@ 
+/*
+ * Copyright (c) 2017, Impinj, Inc.
+ *
+ * i.MX7 IOMUXC block emulation code
+ *
+ * Author: Andrey Smirnov <[e-mail]>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/misc/imx7_iomuxc.h"
+#include "qemu/log.h"
+
+static void imx7_iomuxc_reset(DeviceState *dev)
+{
+    IMX7IOMUXCState *s = IMX7_IOMUXC(dev);
+
+    memset(s->regs, 0, sizeof(s->regs));
+}
+
+static uint64_t imx7_iomuxc_read(void *opaque, hwaddr offset,
+                               unsigned size)
+{
+    IMX7IOMUXCState *s = opaque;
+    return s->regs[offset / sizeof(uint32_t)];
+}
+
+static void imx7_iomuxc_write(void *opaque, hwaddr offset,
+                            uint64_t value, unsigned size)
+{
+    IMX7IOMUXCState *s = opaque;
+    s->regs[offset / sizeof(uint32_t)] = value;
+}
+
+static const struct MemoryRegionOps imx7_iomuxc_ops = {
+    .read = imx7_iomuxc_read,
+    .write = imx7_iomuxc_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl = {
+        /*
+         * Our device would not work correctly if the guest was doing
+         * unaligned access. This might not be a limitation on the real
+         * device but in practice there is no reason for a guest to access
+         * this device unaligned.
+         */
+        .min_access_size = 4,
+        .max_access_size = 4,
+        .unaligned = false,
+    },
+};
+
+static void imx7_iomuxc_init(Object *obj)
+{
+    SysBusDevice *sd = SYS_BUS_DEVICE(obj);
+    IMX7IOMUXCState *s = IMX7_IOMUXC(obj);
+
+    memory_region_init_io(&s->iomem,
+                          obj,
+                          &imx7_iomuxc_ops,
+                          s,
+                          TYPE_IMX7_IOMUXC ".iomem",
+                          sizeof(s->regs));
+    sysbus_init_mmio(sd, &s->iomem);
+}
+
+static const VMStateDescription vmstate_imx7_iomuxc = {
+    .name = TYPE_IMX7_IOMUXC,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32_ARRAY(regs, IMX7IOMUXCState, IOMUXC_NUM),
+        VMSTATE_END_OF_LIST()
+    },
+};
+
+static void imx7_iomuxc_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->reset = imx7_iomuxc_reset;
+    dc->vmsd  = &vmstate_imx7_iomuxc;
+    dc->desc  = "i.MX IOMUXC Module";
+}
+
+static const TypeInfo imx7_iomuxc_info = {
+    .name          = TYPE_IMX7_IOMUXC,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(IMX7IOMUXCState),
+    .instance_init = imx7_iomuxc_init,
+    .class_init    = imx7_iomuxc_class_init,
+};
+
+static void imx7_iomuxc_register_type(void)
+{
+    type_register_static(&imx7_iomuxc_info);
+}
+type_init(imx7_iomuxc_register_type)
diff --git a/include/hw/misc/imx7_iomuxc.h b/include/hw/misc/imx7_iomuxc.h
new file mode 100644
index 0000000000..7041a1ff42
--- /dev/null
+++ b/include/hw/misc/imx7_iomuxc.h
@@ -0,0 +1,22 @@ 
+#ifndef IMX7_IOMUXC_H
+#define IMX7_IOMUXC_H
+
+#include "hw/sysbus.h"
+
+enum IMX7IOMUXCRegisters {
+    IOMUXC_NUM = 0x740 / sizeof(uint32_t),
+};
+
+typedef struct IMX7IOMUXCState {
+    /*< private >*/
+    SysBusDevice parent_obj;
+
+    /*< public >*/
+    MemoryRegion iomem;
+    uint32_t     regs[IOMUXC_NUM];
+} IMX7IOMUXCState;
+
+#define TYPE_IMX7_IOMUXC "imx7-iomuxc"
+#define IMX7_IOMUXC(obj) OBJECT_CHECK(IMX7IOMUXCState, (obj), TYPE_IMX7_IOMUXC)
+
+#endif /* IMX7_IOMUXC_H */