From: Kuo-Jung Su <dant...@faraday-tech.com>
It's used to perform AHB remap and if the SDRAM is initialized
before AHB remap process activated, then it would also perform
the QEMU RAM initialization.
Signed-off-by: Kuo-Jung Su <dant...@faraday-tech.com>
---
hw/arm/Makefile.objs | 1 +
hw/arm/faraday_a369_soc.c | 3 +
hw/arm/ftahbc020.c | 189 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 193 insertions(+)
create mode 100644 hw/arm/ftahbc020.c
diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
index 6771072..33c9482 100644
--- a/hw/arm/Makefile.objs
+++ b/hw/arm/Makefile.objs
@@ -38,3 +38,4 @@ obj-y += faraday_a369.o \
faraday_a369_scu.o \
faraday_a369_kpd.o
obj-y += ftintc020.o
+obj-y += ftahbc020.o
diff --git a/hw/arm/faraday_a369_soc.c b/hw/arm/faraday_a369_soc.c
index 3d861d2..e7343d9 100644
--- a/hw/arm/faraday_a369_soc.c
+++ b/hw/arm/faraday_a369_soc.c
@@ -145,6 +145,9 @@ a369soc_device_init(FaradaySoCState *s)
/* ftkbc010 */
sysbus_create_simple("a369.keypad", 0x92f00000, pic[21]);
+
+ /* ftahbc020 */
+ s->ahbc = sysbus_create_simple("ftahbc020", 0x94000000, NULL);
}
static int a369soc_init(SysBusDevice *busdev)
diff --git a/hw/arm/ftahbc020.c b/hw/arm/ftahbc020.c
new file mode 100644
index 0000000..b558e90
--- /dev/null
+++ b/hw/arm/ftahbc020.c
@@ -0,0 +1,189 @@
+/*
+ * Faraday AHB controller
+ *
+ * Copyright (c) 2012 Faraday Technology
+ * Written by Dante Su <dant...@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_SLAVE(n) ((n) * 4) /* Slave config (base & size) */
+#define REG_PRIR 0x80 /* Priority register */
+#define REG_IDLECR 0x84 /* IDLE count register */
+#define REG_CR 0x88 /* Control register */
+#define REG_REVR 0x8c /* Revision register */
+
+#define CR_REMAP 0x01 /* Enable AHB remap for slave 4 & 6 */
+
+#define TYPE_FTAHBC020 "ftahbc020"
+
+typedef struct Ftahbc020State {
+ SysBusDevice busdev;
+ MemoryRegion iomem;
+
+ /* HW register cache */
+ uint32_t cr;
+} Ftahbc020State;
+
+#define FTAHBC020(obj) \
+ OBJECT_CHECK(Ftahbc020State, obj, TYPE_FTAHBC020)
+
+static uint64_t
+ftahbc020_mem_read(void *opaque, hwaddr addr, unsigned size)
+{
+ Ftahbc020State *s = FTAHBC020(opaque);
+ FaradaySoCState *soc = FARADAY_SOC_GET_CORE();
+ uint64_t ret = 0;
+
+ switch (addr) {
+ /* slave address & window configuration */
+ case REG_SLAVE(0) ... REG_SLAVE(3):
+ case REG_SLAVE(5):
+ case REG_SLAVE(7) ... REG_SLAVE(31):
+ ret = soc->ahb_slave[addr / 4];
+ break;
+ case REG_SLAVE(4):
+ ret = soc->rom_base | (soc->ahb_slave[4] & 0x000f0000);
+ break;
+ case REG_SLAVE(6):
+ ret = soc->ram_base | (soc->ahb_slave[6] & 0x000f0000);
+ break;
+ /* control register */
+ case REG_CR:
+ if (soc->ahb_remapped) {
+ s->cr |= CR_REMAP;
+ }
+ ret = s->cr;
+ break;
+ case REG_REVR:
+ ret = 0x00010301; /* rev. 1.3.1 */
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "ftahbc020: undefined memory access@0x%llx\n", addr);
+ break;
+ }
+
+ return ret;
+}
+
+static void
+ftahbc020_mem_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
+{
+ Ftahbc020State *s = FTAHBC020(opaque);
+ FaradaySoCState *soc = FARADAY_SOC_GET_CORE();
+
+ switch (addr) {
+ case REG_CR: /* control register */
+ s->cr = (uint32_t)val;
+ if (soc->ahb_remapped && !(s->cr & CR_REMAP)) {
+ hw_error("ftahbc020: Once AHB remap is enabled, "
+ "it could not be disabled!\n");
+ exit(1);
+ }
+ if (!soc->ahb_remapped && (s->cr & CR_REMAP)) {
+ /* Remap AHB slave 4 (ROM) & slave 6 (RAM) */
+ /* 1. Remap RAM to base of ROM */
+ soc->ram_base = soc->ahb_slave[4] & 0xfff00000;
+ /* 2. Remap ROM to base of ROM + size of RAM */
+ soc->rom_base = soc->ram_base
+ + ((1 << extract32(soc->ahb_slave[6], 16, 4)) << 20);
+ /* 3. Update ROM memory map */
+ sysbus_mmio_map(SYS_BUS_DEVICE(soc->rom), 0, soc->rom_base);
+ /* 4. Update RAM memory map if it has been initialized. */
+ if (soc->ddr_inited) {
+ memory_region_del_subregion(soc->as, soc->ram);
+ memory_region_add_subregion(soc->as, soc->ram_base, soc->ram);
+ }
+ soc->ahb_remapped = true;
+ }
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "ftahbc020: undefined memory access@0x%llx\n", addr);
+ break;
+ }
+}
+
+static const MemoryRegionOps mmio_ops = {
+ .read = ftahbc020_mem_read,
+ .write = ftahbc020_mem_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ }
+};
+
+static void ftahbc020_reset(DeviceState *ds)
+{
+ SysBusDevice *busdev = SYS_BUS_DEVICE(ds);
+ Ftahbc020State *s = FTAHBC020(FROM_SYSBUS(Ftahbc020State, busdev));
+ FaradaySoCState *soc = FARADAY_SOC_GET_CORE();
+
+ if (soc->ahb_remapped && !soc->bi) {
+ soc->rom_base = soc->ahb_slave[4] & 0xfff00000;
+ soc->ram_base = soc->ahb_slave[6] & 0xfff00000;
+ sysbus_mmio_map(SYS_BUS_DEVICE(soc->rom), 0, soc->rom_base);
+ soc->ahb_remapped = false;
+ }
+
+ s->cr = 0;
+}
+
+static int ftahbc020_init(SysBusDevice *dev)
+{
+ Ftahbc020State *s = FTAHBC020(FROM_SYSBUS(Ftahbc020State, dev));
+
+ memory_region_init_io(&s->iomem,
+ &mmio_ops,
+ s,
+ TYPE_FTAHBC020,
+ 0x1000);
+ sysbus_init_mmio(dev, &s->iomem);
+ return 0;
+}
+
+static const VMStateDescription vmstate_ftahbc020 = {
+ .name = TYPE_FTAHBC020,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(cr, Ftahbc020State),
+ VMSTATE_END_OF_LIST(),
+ }
+};
+
+static void ftahbc020_class_init(ObjectClass *klass, void *data)
+{
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ k->init = ftahbc020_init;
+ dc->desc = TYPE_FTAHBC020;
+ dc->vmsd = &vmstate_ftahbc020;
+ dc->reset = ftahbc020_reset;
+ dc->no_user = 1;
+}
+
+static const TypeInfo ftahbc020_info = {
+ .name = TYPE_FTAHBC020,
+ .parent = TYPE_FARADAY_SOC,
+ .instance_size = sizeof(Ftahbc020State),
+ .class_init = ftahbc020_class_init,
+};
+
+static void ftahbc020_register_types(void)
+{
+ type_register_static(&ftahbc020_info);
+}
+
+type_init(ftahbc020_register_types)
--
1.7.9.5
