From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762139AbdLSKv1 (ORCPT ); Tue, 19 Dec 2017 05:51:27 -0500 Received: from lelnx194.ext.ti.com ([198.47.27.80]:20788 "EHLO lelnx194.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760324AbdLSKvX (ORCPT ); Tue, 19 Dec 2017 05:51:23 -0500 From: Peter Ujfalusi To: CC: , , , , Subject: [PATCH] dmaengine: ti-dma-crossbar: Fix event mapping for TPCC_EVT_MUX_60_63 Date: Tue, 19 Dec 2017 12:51:16 +0200 Message-ID: <20171219105116.24335-1-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.15.1 MIME-Version: 1.0 Content-Type: text/plain X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vignesh R Register layout of a typical TPCC_EVT_MUX_M_N register is such that the lowest numbered event is at the lowest byte address and highest numbered event at highest byte address. But TPCC_EVT_MUX_60_63 register layout is different, in that the lowest numbered event is at the highest address and highest numbered event is at the lowest address. Therefore, modify ti_am335x_xbar_write() to handle TPCC_EVT_MUX_60_63 register accordingly. Signed-off-by: Vignesh R Signed-off-by: Peter Ujfalusi --- drivers/dma/ti-dma-crossbar.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c index 7df910e7c348..9272b173c746 100644 --- a/drivers/dma/ti-dma-crossbar.c +++ b/drivers/dma/ti-dma-crossbar.c @@ -54,7 +54,15 @@ struct ti_am335x_xbar_map { static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u8 val) { - writeb_relaxed(val, iomem + event); + /* + * TPCC_EVT_MUX_60_63 register layout is different than the + * rest, in the sense, that event 63 is mapped to lowest byte + * and event 60 is mapped to highest, handle it separately. + */ + if (event >= 60 && event <= 63) + writeb_relaxed(val, iomem + (63 - event % 4)); + else + writeb_relaxed(val, iomem + event); } static void ti_am335x_xbar_free(struct device *dev, void *route_data) -- Peter Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki