Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754075Ab3G2Naz (ORCPT ); Mon, 29 Jul 2013 09:30:55 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:41125 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753652Ab3G2Nav (ORCPT ); Mon, 29 Jul 2013 09:30:51 -0400 From: Joel Fernandes To: Tony Lindgren , Sekhar Nori , Santosh Shilimkar , Sricharan R , Rajendra Nayak , Lokesh Vutla , Matt Porter , Grant Likely , Rob Herring , Vinod Koul , Dan Williams , Mark Brown , Benoit Cousson , Russell King , Arnd Bergmann , Olof Johansson , Balaji TK , Gururaja Hebbar , Chris Ball , Jason Kridner CC: Linux OMAP List , Linux ARM Kernel List , Linux DaVinci Kernel List , Linux Kernel Mailing List , Linux MMC List , Joel Fernandes Subject: [PATCH 3/9] ARM: edma: Add function to manually trigger an EDMA channel Date: Mon, 29 Jul 2013 08:29:49 -0500 Message-ID: <1375104595-16018-4-git-send-email-joelf@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1375104595-16018-1-git-send-email-joelf@ti.com> References: <1375104595-16018-1-git-send-email-joelf@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1739 Lines: 61 Manual trigger for events missed as a result of splitting a scatter gather list and DMA'ing it in batches. Add a helper function to trigger a channel incase any such events are missed. Signed-off-by: Joel Fernandes --- arch/arm/common/edma.c | 21 +++++++++++++++++++++ include/linux/platform_data/edma.h | 2 ++ 2 files changed, 23 insertions(+) diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c index 3567ba1..10995b2 100644 --- a/arch/arm/common/edma.c +++ b/arch/arm/common/edma.c @@ -1236,6 +1236,27 @@ void edma_resume(unsigned channel) } EXPORT_SYMBOL(edma_resume); +int edma_manual_trigger(unsigned channel) +{ + unsigned ctlr; + int j; + unsigned int mask; + + ctlr = EDMA_CTLR(channel); + channel = EDMA_CHAN_SLOT(channel); + mask = BIT(channel & 0x1f); + + j = channel >> 5; + + /* EDMA channels without event association */ + edma_shadow0_write_array(ctlr, SH_ESR, j, mask); + + pr_debug("EDMA: ESR%d %08x\n", j, + edma_shadow0_read_array(ctlr, SH_ESR, j)); + return 0; +} +EXPORT_SYMBOL(edma_manual_trigger); + /** * edma_start - start dma on a channel * @channel: channel being activated diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h index 57300fd..0e11eca 100644 --- a/include/linux/platform_data/edma.h +++ b/include/linux/platform_data/edma.h @@ -180,4 +180,6 @@ struct edma_soc_info { const s16 (*xbar_chans)[2]; }; +int edma_manual_trigger(unsigned); + #endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/