From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55335) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z4W7T-0004rN-4T for qemu-devel@nongnu.org; Mon, 15 Jun 2015 11:16:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z4W7M-0004ae-TT for qemu-devel@nongnu.org; Mon, 15 Jun 2015 11:16:15 -0400 Received: from greensocs.com ([193.104.36.180]:49197) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z4W7M-0004aZ-In for qemu-devel@nongnu.org; Mon, 15 Jun 2015 11:16:08 -0400 From: fred.konrad@greensocs.com Date: Mon, 15 Jun 2015 17:15:38 +0200 Message-Id: <1434381343-7583-3-git-send-email-fred.konrad@greensocs.com> In-Reply-To: <1434381343-7583-1-git-send-email-fred.konrad@greensocs.com> References: <1434381343-7583-1-git-send-email-fred.konrad@greensocs.com> Subject: [Qemu-devel] [PATCH V2 2/7] i2c: implement broadcast write. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, peter.crosthwaite@xilinx.com, hyunk@xilinx.com, mark.burton@greensocs.com, guillaume.delbergue@greensocs.com, fred.konrad@greensocs.com From: KONRAD Frederic This does a write to every slaves when the I2C bus get a write to address 0. Signed-off-by: KONRAD Frederic --- hw/i2c/core.c | 46 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 45 insertions(+), 1 deletion(-) diff --git a/hw/i2c/core.c b/hw/i2c/core.c index 5a64026..db1cbdd 100644 --- a/hw/i2c/core.c +++ b/hw/i2c/core.c @@ -15,6 +15,7 @@ struct I2CBus I2CSlave *current_dev; I2CSlave *dev; uint8_t saved_address; + bool broadcast; }; static Property i2c_props[] = { @@ -67,6 +68,8 @@ 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); + + bus->broadcast = false; return bus; } @@ -89,6 +92,21 @@ int i2c_start_transfer(I2CBus *bus, uint8_t address, int recv) I2CSlave *slave = NULL; I2CSlaveClass *sc; + if (address == 0x00) { + /* + * This is a 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->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); @@ -114,9 +132,21 @@ 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; + } + if (!dev) { return; } @@ -131,8 +161,22 @@ 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; @@ -151,7 +195,7 @@ int i2c_recv(I2CBus *bus) I2CSlave *dev = bus->current_dev; I2CSlaveClass *sc; - if (!dev) { + if ((!dev) || (bus->broadcast)) { return -1; } -- 1.9.0