From patchwork Mon Jul 6 16:21:56 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: fred.konrad@greensocs.com X-Patchwork-Id: 491694 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id EC81B1406A9 for ; Tue, 7 Jul 2015 02:23:17 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=greensocs.com header.i=@greensocs.com header.b=HESlqssp; dkim=fail reason="signature verification failed" (1024-bit key) header.d=greensocs.com header.i=@greensocs.com header.b=Gp+iIAsL; dkim-atps=neutral Received: from localhost ([::1]:51946 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZC9Ap-0008Cp-P2 for incoming@patchwork.ozlabs.org; Mon, 06 Jul 2015 12:23:15 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42582) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZC9AF-0007Dd-Hj for qemu-devel@nongnu.org; Mon, 06 Jul 2015 12:22:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZC9A9-00014w-Oa for qemu-devel@nongnu.org; Mon, 06 Jul 2015 12:22:39 -0400 Received: from greensocs.com ([193.104.36.180]:33538) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZC9A9-00014o-EQ for qemu-devel@nongnu.org; Mon, 06 Jul 2015 12:22:33 -0400 Received: from localhost (localhost [127.0.0.1]) by greensocs.com (Postfix) with ESMTP id D8043185779; Mon, 6 Jul 2015 18:22:32 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=greensocs.com; s=mail; t=1436199752; bh=mJTLVZOBIlyJz/fjinRPG2fJ3FwKYmVneyLqgofGdds=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=HESlqsspfkU2j7cz5P7fAqmx6zE7R9XRvqu9PyNZwa9+wpr1fwEiNKdp86FINvMI8 +/M2J5xEFiGmv/KoDYH7V4QesWfUed+G+Yo/Iz8CaBe8FwOJkTuS/omAtbqYETFQnm JmLi17Q/TJS5cQ5OE9raCRH26XoGhO9uT9XQRaQE= X-Virus-Scanned: amavisd-new at greensocs.com Authentication-Results: gs-01.greensocs.com (amavisd-new); dkim=pass (1024-bit key) header.d=greensocs.com Received: from greensocs.com ([127.0.0.1]) by localhost (gs-01.greensocs.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DLlV6AQrgp1N; Mon, 6 Jul 2015 18:22:30 +0200 (CEST) Received: from localhost.localdomain (i16-les03-th2-31-36-202-29.sfr.lns.abo.bbox.fr [31.36.202.29]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: fred.konrad@greensocs.com) by greensocs.com (Postfix) with ESMTPSA id E6746185776; Mon, 6 Jul 2015 18:22:29 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=greensocs.com; s=mail; t=1436199750; bh=mJTLVZOBIlyJz/fjinRPG2fJ3FwKYmVneyLqgofGdds=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Gp+iIAsLI6b12G27ZXMFfKjOLpvPXbuWRoIwEOgot4nQLNsgGvptS4yvHMhsih6Fm KII0h464GNJW+nkjSAsCOw2+q7Y0jHcMKRfNqF55ajzIImE2Hul+Slbroc/bhnYRKT EecTibJOWAjxVdYRd8V/BCRIQpA5MiIhUrRPXP7I= From: fred.konrad@greensocs.com To: qemu-devel@nongnu.org Date: Mon, 6 Jul 2015 18:21:56 +0200 Message-Id: <1436199721-9902-4-git-send-email-fred.konrad@greensocs.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1436199721-9902-1-git-send-email-fred.konrad@greensocs.com> References: <1436199721-9902-1-git-send-email-fred.konrad@greensocs.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 193.104.36.180 Cc: peter.maydell@linaro.org, peter.crosthwaite@xilinx.com, hyunk@xilinx.com, mark.burton@greensocs.com, guillaume.delbergue@greensocs.com, fred.konrad@greensocs.com Subject: [Qemu-devel] [PATCH V3 3/8] i2c: implement broadcast write. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org 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 | 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; }