From patchwork Mon Jun 15 15:15:38 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: 484355 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 4D9D214029E for ; Tue, 16 Jun 2015 01:18:54 +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=bBG9hjmO; dkim=fail reason="signature verification failed" (1024-bit key) header.d=greensocs.com header.i=@greensocs.com header.b=zG5W9emj; dkim-atps=neutral Received: from localhost ([::1]:34785 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z4WA0-0001Df-77 for incoming@patchwork.ozlabs.org; Mon, 15 Jun 2015 11:18:52 -0400 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 Received: from localhost (localhost [127.0.0.1]) by greensocs.com (Postfix) with ESMTP id 11C0D1CE9BD; Mon, 15 Jun 2015 17:16:08 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=greensocs.com; s=mail; t=1434381368; bh=0xSXNNi8c0hUBxeBBRmzm80+H2I5NDwuyQwZA3/gzrk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=bBG9hjmOoYBGF0Ifaz3MF0IDW5CspXFsaUyzHFwhMSNfnK64igF5BI5qM0bseT8Ki lfNyD1c6zI8rB089V3xPh0PRvqNAe/FnRJSdiqFmuLOrj6WyfYMAtyclGtsO9Yw7N5 jWkREV/WGdrabBFNKQyDfo2V9YbJKBZNVzLxILYM= 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 Le_83Tt8n1IQ; Mon, 15 Jun 2015 17:16:00 +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 07FB41CE9BE; Mon, 15 Jun 2015 17:15:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=greensocs.com; s=mail; t=1434381360; bh=0xSXNNi8c0hUBxeBBRmzm80+H2I5NDwuyQwZA3/gzrk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=zG5W9emjkVCftVz/z5d2qKnwT2zG8is7XUnHqeEOXmGHUOxwnV/jHCr07fLSn2Cv8 LPsN72HVbvZ/S2akpwc9GJMG250zaZvMXKS3i1KFimeakp9a7PMN9CUpD439iXjYje /HTMpDTf9aX6mmpbgVKpbzNcPKbuIQtIEGRcEERo= From: fred.konrad@greensocs.com To: qemu-devel@nongnu.org Date: Mon, 15 Jun 2015 17:15:38 +0200 Message-Id: <1434381343-7583-3-git-send-email-fred.konrad@greensocs.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1434381343-7583-1-git-send-email-fred.konrad@greensocs.com> References: <1434381343-7583-1-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 V2 2/7] 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 | 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; }