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ARM RealView I2C

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Add ARM Realview I2C host emulation.

Signed-off-by: Paul Brook <paul@codesourcery.com>
This commit is contained in:
Paul Brook 2009-11-20 00:45:54 +00:00
parent 3cd035d863
commit eee4850422
1 changed files with 85 additions and 1 deletions
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86
hw/realview.c
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@ -15,8 +15,86 @@
#include "net.h"
#include "sysemu.h"
#include "boards.h"
#include "bitbang_i2c.h"
#include "sysbus.h"
#define SMP_BOOT_ADDR 0xe0000000
typedef struct {
SysBusDevice busdev;
bitbang_i2c_interface *bitbang;
int out;
int in;
} RealViewI2CState;
static uint32_t realview_i2c_read(void *opaque, target_phys_addr_t offset)
{
RealViewI2CState *s = (RealViewI2CState *)opaque;
if (offset == 0) {
return (s->out & 1) | (s->in << 1);
} else {
hw_error("realview_i2c_read: Bad offset 0x%x\n", (int)offset);
return -1;
}
}
static void realview_i2c_write(void *opaque, target_phys_addr_t offset,
uint32_t value)
{
RealViewI2CState *s = (RealViewI2CState *)opaque;
switch (offset) {
case 0:
s->out |= value & 3;
break;
case 4:
s->out &= ~value;
break;
default:
hw_error("realview_i2c_write: Bad offset 0x%x\n", (int)offset);
}
bitbang_i2c_set(s->bitbang, BITBANG_I2C_SCL, (s->out & 1) != 0);
s->in = bitbang_i2c_set(s->bitbang, BITBANG_I2C_SDA, (s->out & 2) != 0);
}
static CPUReadMemoryFunc * const realview_i2c_readfn[] = {
realview_i2c_read,
realview_i2c_read,
realview_i2c_read
};
static CPUWriteMemoryFunc * const realview_i2c_writefn[] = {
realview_i2c_write,
realview_i2c_write,
realview_i2c_write
};
static int realview_i2c_init(SysBusDevice *dev)
{
RealViewI2CState *s = FROM_SYSBUS(RealViewI2CState, dev);
i2c_bus *bus;
int iomemtype;
bus = i2c_init_bus(&dev->qdev, "i2c");
s->bitbang = bitbang_i2c_init(bus);
iomemtype = cpu_register_io_memory(realview_i2c_readfn,
realview_i2c_writefn, s);
sysbus_init_mmio(dev, 0x1000, iomemtype);
return 0;
}
static SysBusDeviceInfo realview_i2c_info = {
.init = realview_i2c_init,
.qdev.name = "realview_i2c",
.qdev.size = sizeof(RealViewI2CState),
};
static void realview_register_devices(void)
{
sysbus_register_withprop(&realview_i2c_info);
}
/* Board init. */
static struct arm_boot_info realview_binfo = {
@ -63,6 +141,7 @@ static void realview_init(ram_addr_t ram_size,
qemu_irq pic[64];
PCIBus *pci_bus;
NICInfo *nd;
i2c_bus *i2c;
int n;
int done_nic = 0;
qemu_irq cpu_irq[4];
@ -202,10 +281,14 @@ static void realview_init(ram_addr_t ram_size,
}
}
dev = sysbus_create_simple("realview_i2c", 0x10002000, NULL);
i2c = (i2c_bus *)qdev_get_child_bus(dev, "i2c");
i2c_create_slave(i2c, "ds1338", 0x68);
/* Memory map for RealView Emulation Baseboard: */
/* 0x10000000 System registers. */
/* 0x10001000 System controller. */
/* 0x10002000 Two-Wire Serial Bus. */
/* 0x10002000 Two-Wire Serial Bus. */
/* 0x10003000 Reserved. */
/* 0x10004000 AACI. */
/* 0x10005000 MCI. */
@ -362,3 +445,4 @@ static void realview_machine_init(void)
}
machine_init(realview_machine_init);
device_init(realview_register_devices)