From patchwork Fri Jan 24 08:43:56 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 3533601 Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id BDAD99F377 for ; Fri, 24 Jan 2014 08:48:54 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 83119201BB for ; Fri, 24 Jan 2014 08:48:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3888D20173 for ; Fri, 24 Jan 2014 08:48:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752355AbaAXIsS (ORCPT ); Fri, 24 Jan 2014 03:48:18 -0500 Received: from albert.telenet-ops.be ([195.130.137.90]:49648 "EHLO albert.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752431AbaAXIoR (ORCPT ); Fri, 24 Jan 2014 03:44:17 -0500 Received: from ayla.of.borg ([84.193.72.141]) by albert.telenet-ops.be with bizsmtp id HkkF1n01Q32ts5g06kkFam; Fri, 24 Jan 2014 09:44:15 +0100 Received: from geert by ayla.of.borg with local (Exim 4.76) (envelope-from ) id 1W6cN5-00036q-La; Fri, 24 Jan 2014 09:44:15 +0100 From: Geert Uytterhoeven To: Mark Brown Cc: linux-spi@vger.kernel.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 06/14] spi: rspi: Merge rspi_send_pio() and rspi_receive_pio() Date: Fri, 24 Jan 2014 09:43:56 +0100 Message-Id: <1390553044-11860-7-git-send-email-geert@linux-m68k.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1390553044-11860-1-git-send-email-geert@linux-m68k.org> References: <1390553044-11860-1-git-send-email-geert@linux-m68k.org> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Geert Uytterhoeven rspi_send_pio() and rspi_receive_pio() are very similar: - the former only sends data, using TX Only Mode, - the latter sends and receives full duplex data to/from the hardware, but uses dummy transmit data. Merge them into rspi_transfer_out_in(), now supporting full duplex if needed. Signed-off-by: Geert Uytterhoeven --- drivers/spi/spi-rspi.c | 101 ++++++++++++++++++++++-------------------------- 1 file changed, 46 insertions(+), 55 deletions(-) diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index d837c5029308..cc90136d02c8 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -389,27 +389,6 @@ static int rspi_data_out_in(struct rspi_data *rspi, u8 data) return rspi_data_in(rspi); } -static int rspi_send_pio(struct rspi_data *rspi, struct spi_transfer *t) -{ - int remain = t->len, ret; - const u8 *data = t->tx_buf; - - while (remain > 0) { - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_TXMD, - RSPI_SPCR); - - ret = rspi_data_out(rspi, *data++); - if (ret < 0) - return ret; - remain--; - } - - /* Waiting for the last transmission */ - rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE); - - return 0; -} - static int qspi_send_pio(struct rspi_data *rspi, struct spi_transfer *t) { int remain = t->len, ret; @@ -563,28 +542,6 @@ static void rspi_receive_init(const struct rspi_data *rspi) RSPI_SPSR); } -static int rspi_receive_pio(struct rspi_data *rspi, struct spi_transfer *t) -{ - int remain = t->len, ret; - u8 *data = t->rx_buf; - - rspi_receive_init(rspi); - - while (remain > 0) { - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_TXMD, - RSPI_SPCR); - - /* dummy write data for generate clock */ - ret = rspi_data_out_in(rspi, DUMMY_DATA); - if (ret < 0) - return ret; - *data++ = ret; - remain--; - } - - return 0; -} - static void qspi_receive_init(const struct rspi_data *rspi) { u8 spsr; @@ -729,27 +686,61 @@ static int rspi_is_dma(const struct rspi_data *rspi, struct spi_transfer *t) return 0; } +static int rspi_transfer_out_in(struct rspi_data *rspi, + struct spi_transfer *xfer) +{ + int remain = xfer->len, ret; + const u8 *tx_buf = xfer->tx_buf; + u8 *rx_buf = xfer->rx_buf; + u8 spcr, data; + + rspi_receive_init(rspi); + + spcr = rspi_read8(rspi, RSPI_SPCR); + if (rx_buf) + spcr &= ~SPCR_TXMD; + else + spcr |= SPCR_TXMD; + rspi_write8(rspi, spcr, RSPI_SPCR); + + while (remain > 0) { + data = tx_buf ? *tx_buf++ : DUMMY_DATA; + ret = rspi_data_out(rspi, data); + if (ret < 0) + return ret; + if (rx_buf) { + ret = rspi_data_in(rspi); + if (ret < 0) + return ret; + *rx_buf++ = ret; + } + remain--; + } + + /* Wait for the last transmission */ + rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE); + + return 0; +} + static int rspi_transfer_one(struct spi_master *master, struct spi_device *spi, struct spi_transfer *xfer) { struct rspi_data *rspi = spi_master_get_devdata(master); - int ret = 0; + int ret; + + if (!rspi_is_dma(rspi, xfer)) + return rspi_transfer_out_in(rspi, xfer); if (xfer->tx_buf) { - if (rspi_is_dma(rspi, xfer)) - ret = rspi_send_dma(rspi, xfer); - else - ret = rspi_send_pio(rspi, xfer); + ret = rspi_send_dma(rspi, xfer); if (ret < 0) return ret; } - if (xfer->rx_buf) { - if (rspi_is_dma(rspi, xfer)) - ret = rspi_receive_dma(rspi, xfer); - else - ret = rspi_receive_pio(rspi, xfer); - } - return ret; + if (xfer->rx_buf) + return rspi_receive_dma(rspi, xfer); + + return 0; } static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi,