From patchwork Fri Dec 11 04:09:58 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vignesh Raghavendra X-Patchwork-Id: 7824321 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 5EFAA9F54F for ; Fri, 11 Dec 2015 04:11:51 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 89E44204E3 for ; Fri, 11 Dec 2015 04:11:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5E6AA204D3 for ; Fri, 11 Dec 2015 04:11:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754140AbbLKEKx (ORCPT ); Thu, 10 Dec 2015 23:10:53 -0500 Received: from arroyo.ext.ti.com ([192.94.94.40]:40345 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753780AbbLKEKv (ORCPT ); Thu, 10 Dec 2015 23:10:51 -0500 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id tBB4AJCU028346; Thu, 10 Dec 2015 22:10:19 -0600 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id tBB4AJ9g018339; Thu, 10 Dec 2015 22:10:19 -0600 Received: from dlep33.itg.ti.com (157.170.170.75) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.3.224.2; Thu, 10 Dec 2015 22:10:19 -0600 Received: from uda0132425.apr.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id tBB4A2h6011860; Thu, 10 Dec 2015 22:10:15 -0600 From: Vignesh R To: Tony Lindgren , Brian Norris , Mark Brown CC: Rob Herring , Russell King , , , , , , , , Vignesh R Subject: [PATCH v5 3/5] mtd: devices: m25p80: add support for mmap read request Date: Fri, 11 Dec 2015 09:39:58 +0530 Message-ID: <1449807000-6457-4-git-send-email-vigneshr@ti.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1449807000-6457-1-git-send-email-vigneshr@ti.com> References: <1449807000-6457-1-git-send-email-vigneshr@ti.com> MIME-Version: 1.0 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_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 Certain spi controllers may provide accelerated interface to read from m25p80 type flash devices. This interface provides better read performance than regular SPI interface. Call spi_flash_read(), if supported, to make use of such interface. Signed-off-by: Vignesh R --- v5: No changes drivers/mtd/devices/m25p80.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index fe9ceb7b5405..00094a668c62 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -131,6 +131,26 @@ static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len, /* convert the dummy cycles to the number of bytes */ dummy /= 8; + if (spi_flash_read_supported(spi)) { + struct spi_flash_read_message msg; + int ret; + + msg.buf = buf; + msg.from = from; + msg.len = len; + msg.read_opcode = nor->read_opcode; + msg.addr_width = nor->addr_width; + msg.dummy_bytes = dummy; + /* TODO: Support other combinations */ + msg.opcode_nbits = SPI_NBITS_SINGLE; + msg.addr_nbits = SPI_NBITS_SINGLE; + msg.data_nbits = m25p80_rx_nbits(nor); + + ret = spi_flash_read(spi, &msg); + *retlen = msg.retlen; + return ret; + } + spi_message_init(&m); memset(t, 0, (sizeof t));