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[Qemu-devel] [PATCH V3 3/8] i2c: implement broadcast write.
From: |
fred . konrad |
Subject: |
[Qemu-devel] [PATCH V3 3/8] i2c: implement broadcast write. |
Date: |
Mon, 6 Jul 2015 18:21:56 +0200 |
From: KONRAD Frederic <address@hidden>
This does a write to every slaves when the I2C bus get a write to address 0.
Signed-off-by: KONRAD Frederic <address@hidden>
---
hw/i2c/core.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 44 insertions(+), 1 deletion(-)
diff --git a/hw/i2c/core.c b/hw/i2c/core.c
index e0f92de..db9413f 100644
--- a/hw/i2c/core.c
+++ b/hw/i2c/core.c
@@ -14,6 +14,7 @@ struct I2CBus
BusState qbus;
I2CSlave *current_dev;
uint8_t saved_address;
+ bool broadcast;
};
static Property i2c_props[] = {
@@ -55,6 +56,7 @@ static const VMStateDescription vmstate_i2c_bus = {
.post_load = i2c_bus_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT8(saved_address, I2CBus),
+ VMSTATE_BOOL(broadcast, I2CBus),
VMSTATE_END_OF_LIST()
}
};
@@ -66,6 +68,7 @@ I2CBus *i2c_init_bus(DeviceState *parent, const char *name)
bus = I2C_BUS(qbus_create(TYPE_I2C_BUS, parent, name));
vmstate_register(NULL, -1, &vmstate_i2c_bus, bus);
+
return bus;
}
@@ -88,6 +91,19 @@ int i2c_start_transfer(I2CBus *bus, uint8_t address, int
recv)
I2CSlave *slave = NULL;
I2CSlaveClass *sc;
+ if (address == 0x00) {
+ /* This is a broadcast. */
+ bus->broadcast = true;
+ QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
+ I2CSlave *dev = I2C_SLAVE(kid->child);
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ if (sc->event) {
+ sc->event(dev, recv ? I2C_START_RECV : I2C_START_SEND);
+ }
+ }
+ return 0;
+ }
+
QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
DeviceState *qdev = kid->child;
I2CSlave *candidate = I2C_SLAVE(qdev);
@@ -113,9 +129,22 @@ int i2c_start_transfer(I2CBus *bus, uint8_t address, int
recv)
void i2c_end_transfer(I2CBus *bus)
{
+ BusChild *kid;
I2CSlave *dev = bus->current_dev;
I2CSlaveClass *sc;
+ if (bus->broadcast) {
+ QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
+ I2CSlave *dev = I2C_SLAVE(kid->child);
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ if (sc->event) {
+ sc->event(dev, I2C_FINISH);
+ }
+ }
+ bus->broadcast = false;
+ return;
+ }
+
if (!dev) {
return;
}
@@ -130,8 +159,22 @@ void i2c_end_transfer(I2CBus *bus)
int i2c_send(I2CBus *bus, uint8_t data)
{
+ BusChild *kid;
I2CSlave *dev = bus->current_dev;
I2CSlaveClass *sc;
+ int ret = 0;
+
+ if (bus->broadcast) {
+ QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
+ I2CSlave *dev = I2C_SLAVE(kid->child);
+ sc = I2C_SLAVE_GET_CLASS(dev);
+ bus->broadcast = true;
+ if (sc->send) {
+ ret |= sc->send(dev, data);
+ }
+ }
+ return ret;
+ }
if (!dev) {
return -1;
@@ -150,7 +193,7 @@ int i2c_recv(I2CBus *bus)
I2CSlave *dev = bus->current_dev;
I2CSlaveClass *sc;
- if (!dev) {
+ if ((!dev) || (bus->broadcast)) {
return -1;
}
--
1.9.0
- [Qemu-devel] [PATCH V3 0/8] Xilinx DisplayPort., fred . konrad, 2015/07/06
- [Qemu-devel] [PATCH V3 1/8] i2cbus: remove unused dev field., fred . konrad, 2015/07/06
- [Qemu-devel] [PATCH V3 3/8] i2c: implement broadcast write.,
fred . konrad <=
- [Qemu-devel] [PATCH V3 4/8] introduce dpcd module., fred . konrad, 2015/07/06
- [Qemu-devel] [PATCH V3 2/8] Introduce AUX bus., fred . konrad, 2015/07/06
- [Qemu-devel] [PATCH V3 5/8] hw/i2c-ddc.c: Implement DDC I2C slave, fred . konrad, 2015/07/06
- [Qemu-devel] [PATCH V3 8/8] arm: xlnx-zynqmp: Add DisplayPort and DPDMA., fred . konrad, 2015/07/06
- [Qemu-devel] [PATCH V3 6/8] Introduce xilinx dpdma., fred . konrad, 2015/07/06
- [Qemu-devel] [PATCH V3 7/8] Introduce xilinx dp., fred . konrad, 2015/07/06