Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752473AbbK3FQb (ORCPT ); Mon, 30 Nov 2015 00:16:31 -0500 Received: from bear.ext.ti.com ([192.94.94.41]:55224 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750812AbbK3FQ1 (ORCPT ); Mon, 30 Nov 2015 00:16:27 -0500 From: Vignesh R To: Tony Lindgren , Brian Norris , Mark Brown CC: Rob Herring , Russell King , , , , , , , , Vignesh R Subject: [PATCH v4 0/5] Add memory mapped read support for ti-qspi Date: Mon, 30 Nov 2015 10:45:10 +0530 Message-ID: <1448860515-28336-1-git-send-email-vigneshr@ti.com> X-Mailer: git-send-email 2.6.3 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: 2334 Lines: 59 Changes since v3: Rework to introduce spi_flash_read_message struct. Support different opcode/addr/data formats as per Brian's suggestion here: https://lkml.org/lkml/2015/11/11/454 Changes since v2: Remove mmap_lock_mutex. Optimize enable/disable of mmap mode. Changes since v1: Introduce API in SPI core that MTD flash driver can call for mmap read instead of directly calling spi-master driver callback. This API makes sure that SPI core msg queue is locked during mmap transfers. v1: https://lkml.org/lkml/2015/9/4/103 Cover letter: This patch series adds support for memory mapped read port of ti-qspi. ti-qspi has a special memory mapped port through which SPI flash memories can be accessed directly via SoC specific memory region. First patch adds a method to pass flash specific information like read opcode, dummy bytes etc and to request mmap read. Second patch implements mmap read method in ti-qspi driver. Patch 3 adapts m25p80 to use mmap read method before trying normal SPI transfer. Patch 4 and 5 add memory map region DT entries for DRA7xx and AM43xx SoCs. This patch series is based on the discussions here: http://www.spinics.net/lists/linux-spi/msg04796.html Tested on DRA74 EVM and AM437x-SK. Read performance increases from ~100kB/s to ~2.5MB/s. Vignesh R (5): spi: introduce accelerated read support for spi flash devices spi: spi-ti-qspi: add mmap mode read support mtd: devices: m25p80: add support for mmap read request ARM: dts: DRA7: add entry for qspi mmap region ARM: dts: AM4372: add entry for qspi mmap region Documentation/devicetree/bindings/spi/ti_qspi.txt | 19 +++- arch/arm/boot/dts/am4372.dtsi | 4 +- arch/arm/boot/dts/dra7.dtsi | 7 +- drivers/mtd/devices/m25p80.c | 20 +++++ drivers/spi/spi-ti-qspi.c | 101 ++++++++++++++++++++-- drivers/spi/spi.c | 45 ++++++++++ include/linux/spi/spi.h | 41 +++++++++ 7 files changed, 225 insertions(+), 12 deletions(-) -- 2.6.3 -- 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/