From mboxrd@z Thu Jan 1 00:00:00 1970 From: 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> References: <1449807000-6457-1-git-send-email-vigneshr@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1449807000-6457-1-git-send-email-vigneshr@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Tony Lindgren , Brian Norris , Mark Brown Cc: Rob Herring , Russell King , hramrach@gmail.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mtd@lists.infradead.org, linux-spi@vger.kernel.org, Vignesh R List-Id: devicetree@vger.kernel.org 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)); -- 2.6.3