From patchwork Fri Aug 14 20:23:16 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Benoit Canet X-Patchwork-Id: 31437 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by bilbo.ozlabs.org (Postfix) with ESMTPS id DC65BB6F1F for ; Sat, 15 Aug 2009 06:32:47 +1000 (EST) Received: from localhost ([127.0.0.1]:34907 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Mc3S5-0000iZ-O8 for incoming@patchwork.ozlabs.org; Fri, 14 Aug 2009 16:32:41 -0400 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1Mc3JJ-0006u8-9L for qemu-devel@nongnu.org; Fri, 14 Aug 2009 16:23:37 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1Mc3JE-0006rz-E7 for qemu-devel@nongnu.org; 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s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=Q3cgU2spgJkZcMqobkWnTxYELhBg2mgEXDdqieePG/Dcgur7r5EZbS3lH/nJLy6xy5 SxDsplGR4mXizE4nRshPOZmPtJwMLgeqA4b/ZkGg7m2+SnhXU6KOiH4vhHMFCy/2ScPs Bdfx94AKifzg5okv+3GGOdB12MK+kh330H3Oc= Received: by 10.210.63.12 with SMTP id l12mr6431eba.15.1250281410921; Fri, 14 Aug 2009 13:23:30 -0700 (PDT) Received: from localhost.localdomain (AMontsouris-157-1-68-201.w90-46.abo.wanadoo.fr [90.46.59.201]) by mx.google.com with ESMTPS id 10sm1145045eyd.35.2009.08.14.13.23.29 (version=SSLv3 cipher=RC4-MD5); Fri, 14 Aug 2009 13:23:29 -0700 (PDT) From: Benoit Canet To: qemu-devel@nongnu.org Date: Fri, 14 Aug 2009 22:23:16 +0200 Message-Id: <1250281397-7660-6-git-send-email-benoit.canet@gmail.com> X-Mailer: git-send-email 1.6.0.4 In-Reply-To: <1250281397-7660-5-git-send-email-benoit.canet@gmail.com> References: <1250281397-7660-1-git-send-email-benoit.canet@gmail.com> <1250281397-7660-2-git-send-email-benoit.canet@gmail.com> <1250281397-7660-3-git-send-email-benoit.canet@gmail.com> <1250281397-7660-4-git-send-email-benoit.canet@gmail.com> <1250281397-7660-5-git-send-email-benoit.canet@gmail.com> X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6 (newer, 2) Cc: Benoit Canet Subject: [Qemu-devel] [PATCH 5/9] Create a Versatile I2C device using the I2C bitbanging module X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Benoit Canet --- Makefile.target | 2 +- hw/versatile_i2c.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 120 insertions(+), 1 deletions(-) create mode 100644 hw/versatile_i2c.c diff --git a/Makefile.target b/Makefile.target index 6b28931..6a78ace 100644 --- a/Makefile.target +++ b/Makefile.target @@ -578,7 +578,7 @@ endif obj-arm-y = integratorcp.o versatilepb.o smc91c111.o arm_pic.o arm_timer.o obj-arm-y += arm_boot.o pl011.o pl031.o pl050.o pl080.o pl110.o pl181.o pl190.o -obj-arm-y += versatile_pci.o +obj-arm-y += versatile_pci.o versatile_i2c.o obj-arm-y += realview_gic.o realview.o arm_sysctl.o mpcore.o obj-arm-y += armv7m.o armv7m_nvic.o stellaris.o pl022.o stellaris_enet.o obj-arm-y += pl061.o diff --git a/hw/versatile_i2c.c b/hw/versatile_i2c.c new file mode 100644 index 0000000..c98cef2 --- /dev/null +++ b/hw/versatile_i2c.c @@ -0,0 +1,119 @@ +/* + * Versatile i2c interface + * + * Copyright (c) 2009 Benoît Canet + * + * This code is licenced under the GNU GPL v2. + */ +#include "hw.h" +#include "sysbus.h" + +#define I2C_CONTROL 0x0 +#define I2C_CONTROLS 0x0 +#define I2C_CONTROLC 0x4 + +#define DATA 1<<1 +#define CLOCK 1 + +typedef struct versatile_i2c_state { + SysBusDevice busdev; + int last_clock; + int last_data; + int read_data; /* data from decoder */ + qemu_irq out[2]; /* 0 = data, 1 = clock */ +} versatile_i2c_state; + +static void versatile_i2c_gpio_set(void *opaque, int irq, int level) +{ + versatile_i2c_state *s = (versatile_i2c_state *) opaque; + + if (irq == 0) + s->read_data = level; +} + +static uint32_t versatile_i2c_read(void *opaque, target_phys_addr_t offset) +{ + versatile_i2c_state *s = (versatile_i2c_state *) opaque; + + switch (offset) { + case I2C_CONTROL: + return (s->read_data << 1) | s->last_clock; + default: + hw_error("versatile_i2c_read: Bad offset %x\n", (int)offset); + return 0; + } +} + +static void versatile_i2c_write(void *opaque, target_phys_addr_t offset, + uint32_t value) +{ + versatile_i2c_state *s = (versatile_i2c_state *) opaque; + int data = s->last_data; + int clock = s->last_clock; + + switch (offset) { + case I2C_CONTROLS: + if (value & DATA) + data = 1; + if (value & CLOCK) + clock = 1; + break; + case I2C_CONTROLC: + if (value & DATA) + data = 0; + if (value & CLOCK) + clock = 0; + break; + default: + hw_error("versatile_i2c_write: Bad offset %x\n", (int)offset); + } + + s->last_clock = clock; + s->last_data = data; + + qemu_set_irq(s->out[0], data); + qemu_set_irq(s->out[1], clock); +} + +static CPUReadMemoryFunc *versatile_i2c_readfn[] = { + versatile_i2c_read, + versatile_i2c_read, + versatile_i2c_read +}; + +static CPUWriteMemoryFunc *versatile_i2c_writefn[] = { + versatile_i2c_write, + versatile_i2c_write, + versatile_i2c_write +}; + +static void versatile_i2c_reset(versatile_i2c_state *s) +{ + s->last_clock = 1; + s->last_data = 1; + qemu_set_irq(s->out[0], s->last_data); + qemu_set_irq(s->out[1], s->last_clock); +} + +static void versatile_i2c_init(SysBusDevice *dev) +{ + versatile_i2c_state *s = FROM_SYSBUS(versatile_i2c_state, dev); + int iomemtype; + + versatile_i2c_reset(s); + + iomemtype = cpu_register_io_memory(versatile_i2c_readfn, + versatile_i2c_writefn, s); + sysbus_init_mmio(dev, 0x1000, iomemtype); + + qdev_init_gpio_in(&dev->qdev, versatile_i2c_gpio_set, 1); + qdev_init_gpio_out(&dev->qdev, s->out, 2); +} + +static void versatile_i2c_register_devices(void) +{ + sysbus_register_dev("versatile,i2c", sizeof(versatile_i2c_state), + versatile_i2c_init); +} + +device_init(versatile_i2c_register_devices)