From patchwork Mon Aug 24 08:47:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinod Koul X-Patchwork-Id: 11732653 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7806016B1 for ; Mon, 24 Aug 2020 09:38:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 60BD12071E for ; Mon, 24 Aug 2020 09:38:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598261887; bh=0ASM38NtqHvLkfihwuFhfZDcSaxHNeAcxdPp58Kpa4o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZK3AjkYQPImbPHjCbBbOJXK5AJhnHfljxa6WuehHcW1q/bFe4zYH77X3g1ICBjcl/ CaSbUtY3obuTewvzCRLseKj2PFuhaFmP03t1m1dMrVhyA7zgeIQhXZtmviotobuxMl RxU4vcrNAJX52eEaX/rUvaiwY3KnX6dpAFqomWbA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726701AbgHXJhy (ORCPT ); Mon, 24 Aug 2020 05:37:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:47318 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727111AbgHXIr3 (ORCPT ); Mon, 24 Aug 2020 04:47:29 -0400 Received: from localhost.localdomain (unknown [122.171.38.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 28FD22072D; Mon, 24 Aug 2020 08:47:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258848; bh=0ASM38NtqHvLkfihwuFhfZDcSaxHNeAcxdPp58Kpa4o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0gzmVpTI2iar2LvRnsjGkjkzApTW6XVndHLQEY3qt0D8XTS42IHBGP0dgVmubv0aZ FqcCNSMULXxLDNsju8mdgsXxYtQ/rm66bzd0zRfxqenI5czhowATCehVbQeJf5Q2vi WMJX1C7ea6zTVH2tEWBSvjvlt851G0WzmqythizQ= From: Vinod Koul To: dmaengine@vger.kernel.org Cc: Vinod Koul , Rob Herring , Bjorn Andersson , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 2/3] dmaengine: add peripheral configuration Date: Mon, 24 Aug 2020 14:17:11 +0530 Message-Id: <20200824084712.2526079-3-vkoul@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200824084712.2526079-1-vkoul@kernel.org> References: <20200824084712.2526079-1-vkoul@kernel.org> MIME-Version: 1.0 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org Some complex dmaengine controllers have capability to program the peripheral device, so pass on the peripheral configuration as part of dma_slave_config Signed-off-by: Vinod Koul --- include/linux/dmaengine.h | 75 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 6fbd5c99e30c..264643ca9209 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -380,6 +380,73 @@ enum dma_slave_buswidth { DMA_SLAVE_BUSWIDTH_64_BYTES = 64, }; +/** + * enum spi_transfer_cmd - spi transfer commands + */ +enum spi_transfer_cmd { + SPI_TX = 1, + SPI_RX, + SPI_DUPLEX, +}; + +/** + * struct dmaengine_spi_config - spi config for peripheral + * + * @loopback_en: spi loopback enable when set + * @clock_pol: clock polarity + * @data_pol: data polarity + * @pack_en: process tx/rx buffers as packed + * @word_len: spi word length + * @clk_div: source clock divider + * @clk_src: serial clock + * @cmd: spi cmd + * @cs: chip select toggle + * @rx_len: receive length for spi buffer + */ +struct dmaengine_spi_config { + u8 loopback_en; + u8 clock_pol; + u8 data_pol; + u8 pack_en; + u8 word_len; + u32 clk_div; + u32 clk_src; + u8 fragmentation; + enum spi_transfer_cmd cmd; + u8 cs; + u32 rx_len; +}; + +/** + * struct dmaengine_i2c_config - i2c config for peripheral + * + * @pack_enable: process tx/rx buffers as packed + * @cycle_count: clock cycles to be sent + * @high_count: high period of clock + * @low_count: low period of clock + * @clk_div: source clock divider + * @addr: i2c bus address + * @strech: strech the clock at eot + * @op: i2c cmd + */ +struct dmaengine_i2c_config { + u8 pack_enable; + u8 cycle_count; + u8 high_count; + u8 low_count; + u16 clk_div; + u8 addr; + u8 strech; + u8 op; +}; + +enum dmaengine_peripheral { + DMAENGINE_PERIPHERAL_SPI, + DMAENGINE_PERIPHERAL_I2C, + DMAENGINE_PERIPHERAL_UART, + DMAENGINE_PERIPHERAL_LAST = DMAENGINE_PERIPHERAL_UART, +}; + /** * struct dma_slave_config - dma slave channel runtime config * @direction: whether the data shall go in or out on this slave @@ -418,6 +485,10 @@ enum dma_slave_buswidth { * @slave_id: Slave requester id. Only valid for slave channels. The dma * slave peripheral will have unique id as dma requester which need to be * pass as slave config. + * @peripheral: type of peripheral to DMA to/from + * @set_config: set peripheral config + * @spi: peripheral config for spi + * @:i2c peripheral config for i2c * * This struct is passed in as configuration data to a DMA engine * in order to set up a certain channel for DMA transport at runtime. @@ -443,6 +514,10 @@ struct dma_slave_config { u32 dst_port_window_size; bool device_fc; unsigned int slave_id; + enum dmaengine_peripheral peripheral; + u8 set_config; + struct dmaengine_spi_config spi; + struct dmaengine_i2c_config i2c; }; /**