ARM RealView I2C
Add ARM Realview I2C host emulation. Signed-off-by: Paul Brook <paul@codesourcery.com>
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@ -15,8 +15,86 @@
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#include "net.h"
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#include "net.h"
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#include "sysemu.h"
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#include "sysemu.h"
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#include "boards.h"
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#include "boards.h"
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#include "bitbang_i2c.h"
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#include "sysbus.h"
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#define SMP_BOOT_ADDR 0xe0000000
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#define SMP_BOOT_ADDR 0xe0000000
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typedef struct {
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SysBusDevice busdev;
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bitbang_i2c_interface *bitbang;
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int out;
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int in;
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} RealViewI2CState;
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static uint32_t realview_i2c_read(void *opaque, target_phys_addr_t offset)
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{
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RealViewI2CState *s = (RealViewI2CState *)opaque;
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if (offset == 0) {
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return (s->out & 1) | (s->in << 1);
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} else {
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hw_error("realview_i2c_read: Bad offset 0x%x\n", (int)offset);
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return -1;
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}
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}
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static void realview_i2c_write(void *opaque, target_phys_addr_t offset,
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uint32_t value)
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{
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RealViewI2CState *s = (RealViewI2CState *)opaque;
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switch (offset) {
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case 0:
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s->out |= value & 3;
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break;
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case 4:
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s->out &= ~value;
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break;
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default:
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hw_error("realview_i2c_write: Bad offset 0x%x\n", (int)offset);
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}
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bitbang_i2c_set(s->bitbang, BITBANG_I2C_SCL, (s->out & 1) != 0);
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s->in = bitbang_i2c_set(s->bitbang, BITBANG_I2C_SDA, (s->out & 2) != 0);
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}
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static CPUReadMemoryFunc * const realview_i2c_readfn[] = {
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realview_i2c_read,
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realview_i2c_read,
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realview_i2c_read
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};
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static CPUWriteMemoryFunc * const realview_i2c_writefn[] = {
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realview_i2c_write,
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realview_i2c_write,
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realview_i2c_write
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};
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static int realview_i2c_init(SysBusDevice *dev)
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{
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RealViewI2CState *s = FROM_SYSBUS(RealViewI2CState, dev);
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i2c_bus *bus;
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int iomemtype;
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bus = i2c_init_bus(&dev->qdev, "i2c");
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s->bitbang = bitbang_i2c_init(bus);
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iomemtype = cpu_register_io_memory(realview_i2c_readfn,
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realview_i2c_writefn, s);
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sysbus_init_mmio(dev, 0x1000, iomemtype);
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return 0;
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}
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static SysBusDeviceInfo realview_i2c_info = {
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.init = realview_i2c_init,
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.qdev.name = "realview_i2c",
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.qdev.size = sizeof(RealViewI2CState),
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};
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static void realview_register_devices(void)
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{
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sysbus_register_withprop(&realview_i2c_info);
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}
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/* Board init. */
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/* Board init. */
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static struct arm_boot_info realview_binfo = {
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static struct arm_boot_info realview_binfo = {
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@ -63,6 +141,7 @@ static void realview_init(ram_addr_t ram_size,
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qemu_irq pic[64];
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qemu_irq pic[64];
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PCIBus *pci_bus;
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PCIBus *pci_bus;
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NICInfo *nd;
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NICInfo *nd;
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i2c_bus *i2c;
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int n;
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int n;
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int done_nic = 0;
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int done_nic = 0;
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qemu_irq cpu_irq[4];
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qemu_irq cpu_irq[4];
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@ -202,10 +281,14 @@ static void realview_init(ram_addr_t ram_size,
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}
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}
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}
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}
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dev = sysbus_create_simple("realview_i2c", 0x10002000, NULL);
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i2c = (i2c_bus *)qdev_get_child_bus(dev, "i2c");
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i2c_create_slave(i2c, "ds1338", 0x68);
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/* Memory map for RealView Emulation Baseboard: */
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/* Memory map for RealView Emulation Baseboard: */
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/* 0x10000000 System registers. */
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/* 0x10000000 System registers. */
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/* 0x10001000 System controller. */
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/* 0x10001000 System controller. */
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/* 0x10002000 Two-Wire Serial Bus. */
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/* 0x10002000 Two-Wire Serial Bus. */
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/* 0x10003000 Reserved. */
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/* 0x10003000 Reserved. */
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/* 0x10004000 AACI. */
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/* 0x10004000 AACI. */
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/* 0x10005000 MCI. */
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/* 0x10005000 MCI. */
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@ -362,3 +445,4 @@ static void realview_machine_init(void)
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}
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}
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machine_init(realview_machine_init);
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machine_init(realview_machine_init);
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device_init(realview_register_devices)
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