From patchwork Thu Mar 7 03:28:00 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wenyou Yang X-Patchwork-Id: 2229621 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id EE8AD3FC8F for ; Thu, 7 Mar 2013 03:35:26 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UDRXp-0005Mf-Gm; Thu, 07 Mar 2013 03:31:01 +0000 Received: from eusmtp01.atmel.com ([212.144.249.242]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UDRXf-0005KE-9h for linux-arm-kernel@lists.infradead.org; Thu, 07 Mar 2013 03:30:55 +0000 Received: from apsmtp01.atmel.com (10.168.254.30) by eusmtp01.atmel.com (10.161.101.30) with Microsoft SMTP Server id 14.2.318.4; Thu, 7 Mar 2013 04:30:49 +0100 Received: from shaarm01.corp.atmel.com (10.168.254.13) by apsmtp01.corp.atmel.com (10.168.254.30) with Microsoft SMTP Server id 14.2.318.1; Thu, 7 Mar 2013 11:30:34 +0800 From: Wenyou Yang To: Subject: [PATCH v6 03/16] spi/spi-atmel: add support transfer on CS1, 2, 3, not only on CS0 Date: Thu, 7 Mar 2013 11:28:00 +0800 Message-ID: <1362626880-6703-1-git-send-email-wenyou.yang@atmel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1362626715-6549-1-git-send-email-wenyou.yang@atmel.com> References: <1362626715-6549-1-git-send-email-wenyou.yang@atmel.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130306_223054_349753_B5BF3F57 X-CRM114-Status: GOOD ( 11.46 ) X-Spam-Score: -2.5 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -0.6 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: richard.genoud@gmail.com, JM.Lin@atmel.com, nicolas.ferre@atmel.com, linux-kernel@vger.kernel.org, wenyou.yang@atmel.com, grant.likely@secretlab.ca, spi-devel-general@lists.sourceforge.net, plagnioj@jcrosoft.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Signed-off-by: Wenyou Yang Cc: spi-devel-general@lists.sourceforge.net Cc: linux-kernel@vger.kernel.org --- drivers/spi/spi-atmel.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index 8724157..e05aa8c 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -255,11 +255,6 @@ static bool atmel_spi_is_v2(struct atmel_spi *as) * Master on Chip Select 0.") No workaround exists for that ... so for * nCS0 on that chip, we (a) don't use the GPIO, (b) can't support CS_HIGH, * and (c) will trigger that first erratum in some cases. - * - * TODO: Test if the atmel_spi_is_v2() branch below works on - * AT91RM9200 if we use some other register than CSR0. However, don't - * do this unconditionally since AP7000 has an errata where the BITS - * field in CSR0 overrides all other CSRs. */ static void cs_activate(struct atmel_spi *as, struct spi_device *spi) @@ -269,18 +264,22 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi) u32 mr; if (atmel_spi_is_v2(as)) { - /* - * Always use CSR0. This ensures that the clock - * switches to the correct idle polarity before we - * toggle the CS. + spi_writel(as, CSR0 + 4 * spi->chip_select, asd->csr); + /* For the low SPI version, there is a issue that PDC transfer + * on CS1,2,3 needs SPI_CSR0.BITS config as SPI_CSR1,2,3.BITS */ spi_writel(as, CSR0, asd->csr); if (as->caps.has_wdrbt) { - spi_writel(as, MR, SPI_BF(PCS, 0x0e) | SPI_BIT(WDRBT) - | SPI_BIT(MODFDIS) | SPI_BIT(MSTR)); + spi_writel(as, MR, + SPI_BF(PCS, ~(0x01 << spi->chip_select)) + | SPI_BIT(WDRBT) + | SPI_BIT(MODFDIS) + | SPI_BIT(MSTR)); } else { - spi_writel(as, MR, SPI_BF(PCS, 0x0e) | SPI_BIT(MODFDIS) - | SPI_BIT(MSTR)); + spi_writel(as, MR, + SPI_BF(PCS, ~(0x01 << spi->chip_select)) + | SPI_BIT(MODFDIS) + | SPI_BIT(MSTR)); } mr = spi_readl(as, MR); gpio_set_value(asd->npcs_pin, active);