From patchwork Fri Dec 2 08:55:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 630832 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0DAECC4332F for ; Fri, 2 Dec 2022 08:57:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233025AbiLBI5Q (ORCPT ); Fri, 2 Dec 2022 03:57:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232844AbiLBI43 (ORCPT ); Fri, 2 Dec 2022 03:56:29 -0500 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F38FDC056E for ; Fri, 2 Dec 2022 00:56:06 -0800 (PST) Received: by mail-wr1-x42f.google.com with SMTP id f18so6780745wrj.5 for ; Fri, 02 Dec 2022 00:56:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20210112.gappssmtp.com; s=20210112; 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=h9KBlEE4azsWDdEqHoIw3zf1p218z3Yb8Z5E0IDcw8M=; b=SkUvqcIAd73kDG42S6QB6U76WvXAzT/BOgDjn10hVqfNl12MhimRk/M1zOxlQZs477 gqQlU4L+UDnx94Z8r+153WErEZDY6kPYaj8r12w+JSkFdHulDnoOCnFwEru0Hwa6ddlf DazhVeJimLSunp4EVMYe7N48+yRfBdW+4iLi+1O7S8leBwAdYeYLCVJlcgltc11z7Po6 uPBuADvmfidd8+BknjDWreVMz6I1XvpIoTgB5RM9S35qsSNiWJiILmwxTOrTuIqZNEw5 A6Vf7fmE8IiaF+D9pbCEGsM/6yUQIpRycclDsaDRyfLnYiPjhZZ8m98ydP5fmImtNJEV MTPg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=h9KBlEE4azsWDdEqHoIw3zf1p218z3Yb8Z5E0IDcw8M=; b=LFxgzdCIUt95Ur5znGtzoCV159oilkx7KEn6CytHNwxt0LadSlqhy3wtQPr+nTMrwo e8jd3RJY0EMrJI8NX0j2VdXdWlPZxPB4oDCnb5DM0F1WWXFqVmZRdrvWE3i289zARcH7 GJlSsvaycfL90VKV4zsaIqJgdSfEGPBSZ31wWrdY3NTc/QLnrAPwOU3kCF7RrROFkOlc 0uxLT1zwa7cA/n82kGfCn+Ux0vqmfyc9gHn2x1D7qIIosp1e8P2ZISDXi1z5idAic52F ZPQNf3dCD84nUbEGLaMX+GbOLB0AKAjG0RK4cCTro2tgQ2owtl6ztlttfTDncd+rTCDB iJ9A== X-Gm-Message-State: ANoB5plv+T/tr6y8919Hf4KpvVMTF9zu8PgHD0WJ2LGDdWe9NOMa2UaQ 4vgpjZ9Z3CurxxLwDbGYOLIixQ== X-Google-Smtp-Source: AA0mqf5b5ms65cPJXa1FoxhdEHJjBXpIj4wTipcyyNx37CsRn0kmBt/StwmPIy2w70s+JS7jPeUPbA== X-Received: by 2002:a5d:4149:0:b0:242:149c:5690 with SMTP id c9-20020a5d4149000000b00242149c5690mr15384879wrq.491.1669971365264; Fri, 02 Dec 2022 00:56:05 -0800 (PST) Received: from brgl-uxlite.home ([2a01:cb1d:334:ac00:29a4:6f04:ddb1:1ed7]) by smtp.gmail.com with ESMTPSA id a13-20020adfed0d000000b0024219b1cb1bsm6527517wro.60.2022.12.02.00.56.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Dec 2022 00:56:04 -0800 (PST) From: Bartosz Golaszewski To: Andy Gross , Bjorn Andersson , Konrad Dybcio , Greg Kroah-Hartman , Jiri Slaby , Srinivas Kandagatla , Vinod Koul , Alex Elder , =?utf-8?q?Ilp?= =?utf-8?q?o_J=C3=A4rvinen?= Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v5 08/14] tty: serial: qcom-geni-serial: split out the FIFO tx code Date: Fri, 2 Dec 2022 09:55:48 +0100 Message-Id: <20221202085554.59637-9-brgl@bgdev.pl> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20221202085554.59637-1-brgl@bgdev.pl> References: <20221202085554.59637-1-brgl@bgdev.pl> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Bartosz Golaszewski qcom_geni_serial_handle_tx() is pretty big, let's move the code that handles the actual writing of data to a separate function which makes sense in preparation for introducing a dma variant of handle_tx(). Signed-off-by: Bartosz Golaszewski --- drivers/tty/serial/qcom_geni_serial.c | 60 +++++++++++++++------------ 1 file changed, 33 insertions(+), 27 deletions(-) diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 68a1402fbe58..91336d2d20fc 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -704,19 +704,48 @@ static void qcom_geni_serial_start_rx(struct uart_port *uport) writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN); } +static int qcom_geni_serial_send_chunk_fifo(struct uart_port *uport, + unsigned int chunk) +{ + struct qcom_geni_serial_port *port = to_dev_port(uport); + struct circ_buf *xmit = &uport->state->xmit; + size_t remaining = chunk; + int i, tail = xmit->tail; + + for (i = 0; i < chunk; ) { + unsigned int tx_bytes; + u8 buf[sizeof(u32)]; + int c; + + memset(buf, 0, sizeof(buf)); + tx_bytes = min_t(size_t, remaining, BYTES_PER_FIFO_WORD); + + for (c = 0; c < tx_bytes ; c++) { + buf[c] = xmit->buf[tail++]; + tail &= UART_XMIT_SIZE - 1; + } + + iowrite32_rep(uport->membase + SE_GENI_TX_FIFOn, buf, 1); + + i += tx_bytes; + uport->icount.tx += tx_bytes; + remaining -= tx_bytes; + port->tx_remaining -= tx_bytes; + } + + return tail; +} + static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done, bool active) { struct qcom_geni_serial_port *port = to_dev_port(uport); struct circ_buf *xmit = &uport->state->xmit; size_t avail; - size_t remaining; size_t pending; - int i; u32 status; u32 irq_en; unsigned int chunk; - int tail; status = readl(uport->membase + SE_GENI_TX_FIFO_STATUS); @@ -735,7 +764,6 @@ static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done, avail = port->tx_fifo_depth - (status & TX_FIFO_WC); avail *= BYTES_PER_FIFO_WORD; - tail = xmit->tail; chunk = min(avail, pending); if (!chunk) goto out_write_wakeup; @@ -750,29 +778,7 @@ static void qcom_geni_serial_handle_tx(struct uart_port *uport, bool done, uport->membase + SE_GENI_M_IRQ_EN); } - remaining = chunk; - for (i = 0; i < chunk; ) { - unsigned int tx_bytes; - u8 buf[sizeof(u32)]; - int c; - - memset(buf, 0, sizeof(buf)); - tx_bytes = min_t(size_t, remaining, BYTES_PER_FIFO_WORD); - - for (c = 0; c < tx_bytes ; c++) { - buf[c] = xmit->buf[tail++]; - tail &= UART_XMIT_SIZE - 1; - } - - iowrite32_rep(uport->membase + SE_GENI_TX_FIFOn, buf, 1); - - i += tx_bytes; - uport->icount.tx += tx_bytes; - remaining -= tx_bytes; - port->tx_remaining -= tx_bytes; - } - - xmit->tail = tail; + xmit->tail = qcom_geni_serial_send_chunk_fifo(uport, chunk); /* * The tx fifo watermark is level triggered and latched. Though we had