[Qemu-devel] [PATCH v6 05/24] hw/arm: add Faraday FTDDRII030 support

[Kuo-Jung Su <dantesu@gmail.com>]

The FTDDRII030 is a DDRII SDRAM controller which is responsible for
SDRAM initialization.
In QEMU we emulate only the SDRAM enable function.

Signed-off-by: Kuo-Jung Su <dantesu@gmail.com>
---
 hw/arm/Makefile.objs      |    1 +
 hw/arm/faraday_a369_soc.c |    4 ++
 hw/arm/ftddrii030.c       |  170 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 175 insertions(+)
 create mode 100644 hw/arm/ftddrii030.c

diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
index 925f050..6354155 100644
--- a/hw/arm/Makefile.objs
+++ b/hw/arm/Makefile.objs
@@ -39,3 +39,4 @@ obj-y += faraday_a369.o faraday_a369_soc.o faraday_a369_scu.o \
 				faraday_a369_kpd.o
 obj-y += ftintc020.o
 obj-y += ftahbc020.o
+obj-y += ftddrii030.o
diff --git a/hw/arm/faraday_a369_soc.c b/hw/arm/faraday_a369_soc.c
index 847fe05..d612dea 100644
--- a/hw/arm/faraday_a369_soc.c
+++ b/hw/arm/faraday_a369_soc.c
@@ -152,6 +152,10 @@ a369soc_device_init(FaradaySoCState *s)
     /* ftahbc020 */
     ds = sysbus_create_simple("ftahbc020", 0x94000000, NULL);
     s->ahbc = ds;
+
+    /* ftddrii030 */
+    ds = sysbus_create_simple("ftddrii030", 0x93100000, NULL);
+    s->ddrc = ds;
 }
 
 static int a369soc_init(SysBusDevice *dev)
diff --git a/hw/arm/ftddrii030.c b/hw/arm/ftddrii030.c
new file mode 100644
index 0000000..5ee6d3a
--- /dev/null
+++ b/hw/arm/ftddrii030.c
@@ -0,0 +1,170 @@
+/*
+ * Faraday DDRII controller
+ *
+ * Copyright (c) 2012 Faraday Technology
+ * Written by Dante Su <dantesu@faraday-tech.com>
+ *
+ * This code is licensed under GNU GPL v2+
+ */
+
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+#include "hw/devices.h"
+#include "sysemu/sysemu.h"
+
+#include "faraday.h"
+
+#define REG_MCR             0x00    /* memory configuration register */
+#define REG_MSR             0x04    /* memory status register */
+#define REG_REVR            0x50    /* revision register */
+
+#define MSR_INIT_OK         BIT(8)  /* DDR2 initial is completed */
+#define MSR_CMD_MRS         BIT(0)  /* start MRS command */
+
+#define CFG_REGSIZE         (0x50 / 4)
+
+#define TYPE_FTDDRII030     "ftddrii030"
+
+typedef struct Ftddrii030State {
+    SysBusDevice busdev;
+    MemoryRegion iomem;
+
+    /* HW register cache */
+    uint32_t regs[CFG_REGSIZE];
+} Ftddrii030State;
+
+#define FTDDRII030(obj) \
+    OBJECT_CHECK(Ftddrii030State, obj, TYPE_FTDDRII030)
+
+#define DDR_REG32(s, off) \
+    ((s)->regs[(off) / 4])
+
+static uint64_t
+ftddrii030_mem_read(void *opaque, hwaddr addr, unsigned size)
+{
+    Ftddrii030State *s = FTDDRII030(opaque);
+    FaradaySoCState *soc = FARADAY_SOC_GET_CORE();
+    uint64_t ret = 0;
+
+    if (soc->ddr_inited) {
+        DDR_REG32(s, REG_MSR) |= MSR_INIT_OK;
+    }
+
+    switch (addr) {
+    case REG_MCR ... (CFG_REGSIZE - 1) * 4:
+        ret = s->regs[addr / 4];
+        break;
+    case REG_REVR:
+        ret = 0x100;    /* rev. = 0.1.0 */
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+            "ftddrii030: undefined memory access@%#" HWADDR_PRIx "\n", addr);
+        break;
+    }
+
+    return ret;
+}
+
+static void
+ftddrii030_mem_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
+{
+    Ftddrii030State *s = FTDDRII030(opaque);
+    FaradaySoCState *soc = FARADAY_SOC_GET_CORE();
+
+    switch (addr) {
+    case REG_MCR:
+        DDR_REG32(s, REG_MCR) = (uint32_t)val & 0xffff;
+        break;
+    case REG_MSR:
+        val = (val & 0x3f) | (DDR_REG32(s, REG_MSR) & MSR_INIT_OK);
+        if (!soc->ddr_inited && (val & MSR_CMD_MRS)) {
+            val &= ~MSR_CMD_MRS;
+            val |= MSR_INIT_OK;
+            memory_region_add_subregion(soc->as, soc->ram_base, soc->ram);
+            soc->ddr_inited = true;
+        }
+        DDR_REG32(s, REG_MSR) = (uint32_t)val;
+        break;
+    case 0x08 ... (CFG_REGSIZE - 1) * 4: /* DDRII Timing, ECC ...etc. */
+        s->regs[addr / 4] = (uint32_t)val;
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+            "ftddrii030: undefined memory access@%#" HWADDR_PRIx "\n", addr);
+        break;
+    }
+}
+
+static const MemoryRegionOps mmio_ops = {
+    .read  = ftddrii030_mem_read,
+    .write = ftddrii030_mem_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    }
+};
+
+static void ftddrii030_reset(DeviceState *ds)
+{
+    Ftddrii030State *s = FTDDRII030(SYS_BUS_DEVICE(ds));
+    FaradaySoCState *soc = FARADAY_SOC_GET_CORE();
+
+    if (soc->ddr_inited && !soc->bi) {
+        memory_region_del_subregion(soc->as, soc->ram);
+        soc->ddr_inited = false;
+    }
+
+    memset(s->regs, 0, sizeof(s->regs));
+}
+
+static int ftddrii030_init(SysBusDevice *dev)
+{
+    Ftddrii030State *s = FTDDRII030(dev);
+
+    memory_region_init_io(&s->iomem,
+                          &mmio_ops,
+                          s,
+                          TYPE_FTDDRII030,
+                          0x1000);
+    sysbus_init_mmio(dev, &s->iomem);
+    return 0;
+}
+
+static const VMStateDescription vmstate_ftddrii030 = {
+    .name = TYPE_FTDDRII030,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32_ARRAY(regs, Ftddrii030State, CFG_REGSIZE),
+        VMSTATE_END_OF_LIST(),
+    }
+};
+
+static void ftddrii030_class_init(ObjectClass *klass, void *data)
+{
+    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    k->init   = ftddrii030_init;
+    dc->desc  = TYPE_FTDDRII030;
+    dc->vmsd  = &vmstate_ftddrii030;
+    dc->reset = ftddrii030_reset;
+    dc->no_user = 1;
+}
+
+static const TypeInfo ftddrii030_info = {
+    .name          = TYPE_FTDDRII030,
+    .parent        = TYPE_FARADAY_SOC,
+    .instance_size = sizeof(Ftddrii030State),
+    .class_init    = ftddrii030_class_init,
+};
+
+static void ftddrii030_register_types(void)
+{
+    type_register_static(&ftddrii030_info);
+}
+
+type_init(ftddrii030_register_types)
-- 
1.7.9.5