From nobody Tue Nov 26 18:45:56 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1706543418; cv=none; d=zohomail.com; s=zohoarc; b=LOYPOameExmFUJhG/TdrxKLnShGkDqftHC6VH6cGzp8dY1RvKN4Z4g+WxGEbqmQ8hSNQWDHr0e2YQL+sp5pvBCYTl+OxXRKbXe032KJBOzfKhYMumSjhPgkV/ggtWVzOLPctyywkCYZYUmOQcAIRIJfVXsptmYnQbT5LD+hb10g= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1706543418; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=4HnSM2ykj872+1I10ufPqjP1oHcQy/chu5lfcrju4WM=; b=GF7tZvNNBT8nraKRi2lq7ff0rjDlnDYwlHi/vgOMgdkxpeHgL3V9poIj7yDCximqdsYSvAGFx307H7pVEnDCLguRNfuAi95xHjO7ZHhTPz5JH9Iw1f1y3sxslRXgRnq4zn2t3TETpvF7ByXpGR7wq2D51WeIAN1SCUCicbLtj+8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1706543418308143.2562495486186; Mon, 29 Jan 2024 07:50:18 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rUTt2-0004nT-Uj; Mon, 29 Jan 2024 10:49:28 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rUTsw-0004a1-GE for qemu-devel@nongnu.org; Mon, 29 Jan 2024 10:49:23 -0500 Received: from mail-pg1-x52c.google.com ([2607:f8b0:4864:20::52c]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1rUTsu-0005q7-8e for qemu-devel@nongnu.org; Mon, 29 Jan 2024 10:49:22 -0500 Received: by mail-pg1-x52c.google.com with SMTP id 41be03b00d2f7-5d8b887bb0cso1661243a12.2 for ; Mon, 29 Jan 2024 07:49:18 -0800 (PST) Received: from localhost.localdomain ([49.47.195.100]) by smtp.gmail.com with ESMTPSA id p1-20020a170902c70100b001d90143a21fsm34213plp.263.2024.01.29.07.49.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Jan 2024 07:49:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1706543358; x=1707148158; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=4HnSM2ykj872+1I10ufPqjP1oHcQy/chu5lfcrju4WM=; b=ZXDyLYd91EoBy9hWTmhOB9xFmTzIyLpxx0zxyeVOF+4+eGP36KlJtzNcVM/K9Ikd/d 7vBPtdoa54yXuFSbmdPn1oHKX9eOr3AzWRhK2um91kCEQozpmT8ykjyoCEgde4+iCIEt WQTlS4tAKpAdN6b5JtiOcbgNxTYpuevEinnbVlvG8MmdH9ob1TmPtVP8yYSvgBTlVHn3 7nFF4lgMAsixKkhhYa48PvVJU6Fd8LtuSFfQSWYvcnG69MR18uBp6fNX0L72obG8lAD0 2FfuhUOLXkDbWWadrOqL+JNH2kPGEUn0fn4yHRzaaK5Dqov3WTYoI5VMS0LDD2R16cAq 6LVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706543358; x=1707148158; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=4HnSM2ykj872+1I10ufPqjP1oHcQy/chu5lfcrju4WM=; b=jQXREV2FWCcSIVJPIRrxvJ6PmM46WUXY4SBiVat+8VNMvY4yCOZhR8fH9xOd4XqvKh uglEnuGLbYbxQR3j/o7cd/bbTzpM6XdK3TDUVhgR67K03jgzqPdyYMsjoLc+S8PLwfxy mT2ix7pv3BWIYV6uOKsbnKvD264vV1uim/JX4y+Rw5zf3UAfEQo6zYxf6VKodh8jQubX t/cqoCEtbN3Qe3vgL/+P/Tk9FIJMWaJDlHnFOaHpqT9eEb8G8NeLI6ikzi2SFuYQktLP REuwFBiUVo2UX2l3Xxb0nHCTzMpEVSnqYtyCtbefubYEAxsO28zfbzjWmo2TLH1R61zQ CelQ== X-Gm-Message-State: AOJu0YyOB6kZHYWVEGlFI+vUobLa/XrkseYvTPu3TF0O6tpXjI7E4p4+ w0mVHow9KbbuWtvKTeoeOIlbPfoCKKuxRsgdLEkItOXOmhK17/SOGHcTTMJMOu8= X-Google-Smtp-Source: AGHT+IHyhLA4tuuRS9/n/a6qtwsgp5rlSHZyYVl5xo7QsaRDPsuxKAg5cEOxAKIK7KWG2TiWOf6WEw== X-Received: by 2002:a05:6a20:9c8e:b0:19c:a0f9:4f8a with SMTP id mj14-20020a056a209c8e00b0019ca0f94f8amr4428887pzb.20.1706543357574; Mon, 29 Jan 2024 07:49:17 -0800 (PST) From: Rayhan Faizel To: qemu-devel@nongnu.org Cc: Rayhan Faizel Subject: [PATCH 1/2] hw/ssi: Implement BCM2835 SPI Controller Date: Mon, 29 Jan 2024 21:19:07 +0530 Message-Id: <20240129154908.2761091-2-rayhan.faizel@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240129154908.2761091-1-rayhan.faizel@gmail.com> References: <20240129154908.2761091-1-rayhan.faizel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::52c; envelope-from=rayhan.faizel@gmail.com; helo=mail-pg1-x52c.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1706543419456100003 Content-Type: text/plain; charset="utf-8" This patch creates the SPI controller for the BCM2835. Polling and interrup= t modes of transfer are supported. DMA and LoSSI modes are currently unimplemented. Signed-off-by: Rayhan Faizel --- docs/system/arm/raspi.rst | 3 +- hw/ssi/Kconfig | 4 + hw/ssi/bcm2835_spi.c | 288 +++++++++++++++++++++++++++++++++++ hw/ssi/meson.build | 1 + include/hw/ssi/bcm2835_spi.h | 81 ++++++++++ 5 files changed, 375 insertions(+), 2 deletions(-) create mode 100644 hw/ssi/bcm2835_spi.c create mode 100644 include/hw/ssi/bcm2835_spi.h diff --git a/docs/system/arm/raspi.rst b/docs/system/arm/raspi.rst index 922fe375a6..b8198bbd54 100644 --- a/docs/system/arm/raspi.rst +++ b/docs/system/arm/raspi.rst @@ -33,11 +33,10 @@ Implemented devices * USB2 host controller (DWC2 and MPHI) * MailBox controller (MBOX) * VideoCore firmware (property) - + * Peripheral SPI controller (SPI) =20 Missing devices --------------- =20 - * Peripheral SPI controller (SPI) * Analog to Digital Converter (ADC) * Pulse Width Modulation (PWM) diff --git a/hw/ssi/Kconfig b/hw/ssi/Kconfig index 7d90a02181..110533255b 100644 --- a/hw/ssi/Kconfig +++ b/hw/ssi/Kconfig @@ -20,3 +20,7 @@ config XILINX_SPIPS config STM32F2XX_SPI bool select SSI + +config BCM2835_SPI + bool + select SSI \ No newline at end of file diff --git a/hw/ssi/bcm2835_spi.c b/hw/ssi/bcm2835_spi.c new file mode 100644 index 0000000000..757ebc90fa --- /dev/null +++ b/hw/ssi/bcm2835_spi.c @@ -0,0 +1,288 @@ +/* + * BCM2835 SPI Master Controller + * + * Copyright (c) 2024 Rayhan Faizel + * + * Permission is hereby granted, free of charge, to any person obtaining a= copy + * of this software and associated documentation files (the "Software"), t= o deal + * in the Software without restriction, including without limitation the r= ights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or se= ll + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included= in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS= OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OT= HER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING= FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS = IN + * THE SOFTWARE. + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "qemu/fifo8.h" +#include "hw/ssi/bcm2835_spi.h" +#include "hw/irq.h" +#include "migration/vmstate.h" + +static void bcm2835_spi_update_int(BCM2835SPIState *s) +{ + int do_interrupt =3D 0; + + /* Interrupt on DONE */ + if (s->cs & BCM2835_SPI_CS_INTD && s->cs & BCM2835_SPI_CS_DONE) { + do_interrupt =3D 1; + } + /* Interrupt on RXR */ + if (s->cs & BCM2835_SPI_CS_INTR && s->cs & BCM2835_SPI_CS_RXR) { + do_interrupt =3D 1; + } + qemu_set_irq(s->irq, do_interrupt); +} + +static void bcm2835_spi_update_rx_flags(BCM2835SPIState *s) +{ + /* Set RXD if RX FIFO is non empty */ + if (!fifo8_is_empty(&s->rx_fifo)) { + s->cs |=3D BCM2835_SPI_CS_RXD; + } else { + s->cs &=3D ~BCM2835_SPI_CS_RXD; + } + + /* Set RXF if RX FIFO is full */ + if (fifo8_is_full(&s->rx_fifo)) { + s->cs |=3D BCM2835_SPI_CS_RXF; + } else { + s->cs &=3D ~BCM2835_SPI_CS_RXF; + } + + /* Set RXR if RX FIFO is 3/4th used or above */ + if (fifo8_num_used(&s->rx_fifo) >=3D FIFO_SIZE_3_4) { + s->cs |=3D BCM2835_SPI_CS_RXR; + } else { + s->cs &=3D ~BCM2835_SPI_CS_RXR; + } +} + +static void bcm2835_spi_update_tx_flags(BCM2835SPIState *s) +{ + /* Set TXD if TX FIFO is not full */ + if (fifo8_is_full(&s->tx_fifo)) { + s->cs &=3D ~BCM2835_SPI_CS_TXD; + } else { + s->cs |=3D BCM2835_SPI_CS_TXD; + } + + /* Set DONE if in TA mode and TX FIFO is empty */ + if (fifo8_is_empty(&s->tx_fifo) && s->cs & BCM2835_SPI_CS_TA) { + s->cs |=3D BCM2835_SPI_CS_DONE; + } else { + s->cs &=3D ~BCM2835_SPI_CS_DONE; + } +} + +static void bcm2835_spi_flush_tx_fifo(BCM2835SPIState *s) +{ + uint8_t tx_byte, rx_byte; + + while (!fifo8_is_empty(&s->tx_fifo) && !fifo8_is_full(&s->rx_fifo)) { + tx_byte =3D fifo8_pop(&s->tx_fifo); + rx_byte =3D ssi_transfer(s->bus, tx_byte); + fifo8_push(&s->rx_fifo, rx_byte); + } + + bcm2835_spi_update_tx_flags(s); + bcm2835_spi_update_rx_flags(s); +} + +static uint64_t bcm2835_spi_read(void *opaque, hwaddr addr, unsigned size) +{ + BCM2835SPIState *s =3D opaque; + uint32_t readval =3D 0; + + switch (addr) { + case BCM2835_SPI_CS: + readval =3D s->cs & 0xffffffff; + break; + case BCM2835_SPI_FIFO: + bcm2835_spi_flush_tx_fifo(s); + if (s->cs & BCM2835_SPI_CS_RXD) { + readval =3D fifo8_pop(&s->rx_fifo); + bcm2835_spi_update_rx_flags(s); + } + + bcm2835_spi_update_int(s); + break; + case BCM2835_SPI_CLK: + readval =3D s->clk & 0xffff; + break; + case BCM2835_SPI_DLEN: + readval =3D s->dlen & 0xffff; + break; + case BCM2835_SPI_LTOH: + readval =3D s->ltoh & 0xf; + break; + case BCM2835_SPI_DC: + readval =3D s->dc & 0xffffffff; + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, add= r); + } + return readval; +} + +static void bcm2835_spi_write(void *opaque, hwaddr addr, + uint64_t value, unsigned int size) +{ + BCM2835SPIState *s =3D opaque; + + switch (addr) { + case BCM2835_SPI_CS: + s->cs =3D (value & ~RO_MASK) | (s->cs & RO_MASK); + if (!(s->cs & BCM2835_SPI_CS_TA)) { + /* Clear DONE and RXR if TA is off */ + s->cs &=3D ~(BCM2835_SPI_CS_DONE); + s->cs &=3D ~(BCM2835_SPI_CS_RXR); + } + + /* Clear RX FIFO */ + if (s->cs & BCM2835_SPI_CLEAR_RX) { + fifo8_reset(&s->rx_fifo); + bcm2835_spi_update_rx_flags(s); + } + + /* Clear TX FIFO*/ + if (s->cs & BCM2835_SPI_CLEAR_TX) { + fifo8_reset(&s->tx_fifo); + bcm2835_spi_update_tx_flags(s); + } + + /* Set Transfer Active */ + if (s->cs & BCM2835_SPI_CS_TA) { + bcm2835_spi_update_tx_flags(s); + } + + if (s->cs & BCM2835_SPI_CS_DMAEN) { + qemu_log_mask(LOG_UNIMP, "%s: " \ + "DMA not supported\n", __func__); + } + + if (s->cs & BCM2835_SPI_CS_LEN) { + qemu_log_mask(LOG_UNIMP, "%s: " \ + "LoSSI not supported\n", __func__); + } + + bcm2835_spi_update_int(s); + break; + case BCM2835_SPI_FIFO: + /* + * According to documentation, writes to FIFO without TA controls + * CS and DLEN registers. This is supposed to be used in DMA mode + * which is currently unimplemented. Moreover, Linux does not make + * use of this and directly modifies the CS and DLEN registers. + */ + if (s->cs & BCM2835_SPI_CS_TA) { + if (s->cs & BCM2835_SPI_CS_TXD) { + fifo8_push(&s->tx_fifo, value & 0xff); + bcm2835_spi_update_tx_flags(s); + } + + bcm2835_spi_flush_tx_fifo(s); + bcm2835_spi_update_int(s); + } + break; + case BCM2835_SPI_CLK: + s->clk =3D value & 0xffff; + break; + case BCM2835_SPI_DLEN: + s->dlen =3D value & 0xffff; + break; + case BCM2835_SPI_LTOH: + s->ltoh =3D value & 0xf; + break; + case BCM2835_SPI_DC: + s->dc =3D value & 0xffffffff; + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, add= r); + } +} + +static const MemoryRegionOps bcm2835_spi_ops =3D { + .read =3D bcm2835_spi_read, + .write =3D bcm2835_spi_write, + .endianness =3D DEVICE_NATIVE_ENDIAN, +}; + +static void bcm2835_spi_realize(DeviceState *dev, Error **errp) +{ + BCM2835SPIState *s =3D BCM2835_SPI(dev); + s->bus =3D ssi_create_bus(dev, "spi"); + + memory_region_init_io(&s->iomem, OBJECT(dev), &bcm2835_spi_ops, s, + TYPE_BCM2835_SPI, 0x18); + sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem); + sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq); + + fifo8_create(&s->tx_fifo, FIFO_SIZE); + fifo8_create(&s->rx_fifo, FIFO_SIZE); +} +static void bcm2835_spi_reset(DeviceState *dev) +{ + BCM2835SPIState *s =3D BCM2835_SPI(dev); + + fifo8_reset(&s->tx_fifo); + fifo8_reset(&s->rx_fifo); + + /* Reset values according to BCM2835 Peripheral Documentation */ + s->cs =3D BCM2835_SPI_CS_TXD | BCM2835_SPI_CS_REN; + s->clk =3D 0; + s->dlen =3D 0; + s->ltoh =3D 0x1; + s->dc =3D 0x30201020; +} + +static const VMStateDescription vmstate_bcm2835_spi =3D { + .name =3D TYPE_BCM2835_SPI, + .version_id =3D 1, + .minimum_version_id =3D 1, + .fields =3D (const VMStateField[]) { + VMSTATE_FIFO8(tx_fifo, BCM2835SPIState), + VMSTATE_FIFO8(rx_fifo, BCM2835SPIState), + VMSTATE_UINT32(cs, BCM2835SPIState), + VMSTATE_UINT32(clk, BCM2835SPIState), + VMSTATE_UINT32(dlen, BCM2835SPIState), + VMSTATE_UINT32(ltoh, BCM2835SPIState), + VMSTATE_UINT32(dc, BCM2835SPIState), + VMSTATE_END_OF_LIST() + } +}; + +static void bcm2835_spi_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc =3D DEVICE_CLASS(klass); + + dc->reset =3D bcm2835_spi_reset; + dc->realize =3D bcm2835_spi_realize; + dc->vmsd =3D &vmstate_bcm2835_spi; +} + +static const TypeInfo bcm2835_spi_info =3D { + .name =3D TYPE_BCM2835_SPI, + .parent =3D TYPE_SYS_BUS_DEVICE, + .instance_size =3D sizeof(BCM2835SPIState), + .class_init =3D bcm2835_spi_class_init, +}; + +static void bcm2835_spi_register_types(void) +{ + type_register_static(&bcm2835_spi_info); +} + +type_init(bcm2835_spi_register_types) diff --git a/hw/ssi/meson.build b/hw/ssi/meson.build index 0aebcdd614..b999aeb027 100644 --- a/hw/ssi/meson.build +++ b/hw/ssi/meson.build @@ -11,3 +11,4 @@ system_ss.add(when: 'CONFIG_XLNX_VERSAL', if_true: files(= 'xlnx-versal-ospi.c')) system_ss.add(when: 'CONFIG_IMX', if_true: files('imx_spi.c')) system_ss.add(when: 'CONFIG_OMAP', if_true: files('omap_spi.c')) system_ss.add(when: 'CONFIG_IBEX', if_true: files('ibex_spi_host.c')) +system_ss.add(when: 'CONFIG_BCM2835_SPI', if_true: files('bcm2835_spi.c')) diff --git a/include/hw/ssi/bcm2835_spi.h b/include/hw/ssi/bcm2835_spi.h new file mode 100644 index 0000000000..d3f8cec111 --- /dev/null +++ b/include/hw/ssi/bcm2835_spi.h @@ -0,0 +1,81 @@ +/* + * BCM2835 SPI Master Controller + * + * Copyright (c) 2024 Rayhan Faizel + * + * Permission is hereby granted, free of charge, to any person obtaining a= copy + * of this software and associated documentation files (the "Software"), t= o deal + * in the Software without restriction, including without limitation the r= ights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or se= ll + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included= in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS= OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OT= HER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING= FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS = IN + * THE SOFTWARE. + */ + +#include "hw/sysbus.h" +#include "hw/ssi/ssi.h" +#include "qom/object.h" +#include "qemu/fifo8.h" + +#define TYPE_BCM2835_SPI "bcm2835-spi" +OBJECT_DECLARE_SIMPLE_TYPE(BCM2835SPIState, BCM2835_SPI) + +/* + * Though BCM2835 documentation says FIFOs have a capacity of 16, + * FIFOs are actually 16 words in size or effectively 64 bytes when operat= ing + * in non DMA mode. + */ +#define FIFO_SIZE 64 +#define FIFO_SIZE_3_4 48 + +#define RO_MASK 0x1f0000 + +#define BCM2835_SPI_CS 0x00 +#define BCM2835_SPI_FIFO 0x04 +#define BCM2835_SPI_CLK 0x08 +#define BCM2835_SPI_DLEN 0x0c +#define BCM2835_SPI_LTOH 0x10 +#define BCM2835_SPI_DC 0x14 + +#define BCM2835_SPI_CS_RXF BIT(20) +#define BCM2835_SPI_CS_RXR BIT(19) +#define BCM2835_SPI_CS_TXD BIT(18) +#define BCM2835_SPI_CS_RXD BIT(17) +#define BCM2835_SPI_CS_DONE BIT(16) +#define BCM2835_SPI_CS_LEN BIT(13) +#define BCM2835_SPI_CS_REN BIT(12) +#define BCM2835_SPI_CS_INTR BIT(10) +#define BCM2835_SPI_CS_INTD BIT(9) +#define BCM2835_SPI_CS_DMAEN BIT(8) +#define BCM2835_SPI_CS_TA BIT(7) +#define BCM2835_SPI_CLEAR_RX BIT(5) +#define BCM2835_SPI_CLEAR_TX BIT(4) + +struct BCM2835SPIState { + /* */ + SysBusDevice parent_obj; + + /* */ + SSIBus *bus; + MemoryRegion iomem; + qemu_irq irq; + + uint32_t cs; + uint32_t clk; + uint32_t dlen; + uint32_t ltoh; + uint32_t dc; + + Fifo8 tx_fifo; + Fifo8 rx_fifo; +}; --=20 2.34.1