From: Vignesh R <vigneshr@ti.com>
To: Tony Lindgren <tony@atomide.com>,
Brian Norris <computersforpeace@gmail.com>,
Mark Brown <broonie@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>,
Russell King <linux@arm.linux.org.uk>, <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 <vigneshr@ti.com>
Subject: [PATCH v5 3/5] mtd: devices: m25p80: add support for mmap read request
Date: Fri, 11 Dec 2015 09:39:58 +0530 [thread overview]
Message-ID: <1449807000-6457-4-git-send-email-vigneshr@ti.com> (raw)
In-Reply-To: <1449807000-6457-1-git-send-email-vigneshr@ti.com>
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 <vigneshr@ti.com>
---
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
next prev parent reply other threads:[~2015-12-11 4:10 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-11 4:09 [PATCH v5 0/5] Add memory mapped read support for ti-qspi Vignesh R
2015-12-11 4:09 ` [PATCH v5 1/5] spi: introduce accelerated read support for spi flash devices Vignesh R
2015-12-11 4:09 ` [PATCH v5 2/5] spi: spi-ti-qspi: add mmap mode read support Vignesh R
2015-12-11 4:09 ` Vignesh R [this message]
2016-02-09 19:36 ` [PATCH v5 3/5] mtd: devices: m25p80: add support for mmap read request Mark Brown
2016-02-11 5:33 ` Vignesh R
2016-02-12 22:37 ` Mark Brown
2016-02-16 8:00 ` Vignesh R
2016-02-16 12:38 ` Mark Brown
2016-02-17 16:11 ` R, Vignesh
2016-02-24 12:21 ` Vignesh R
2015-12-11 4:09 ` [PATCH v5 4/5] ARM: dts: DRA7: add entry for qspi mmap region Vignesh R
2015-12-11 15:09 ` Rob Herring
2015-12-17 18:45 ` Tony Lindgren
2015-12-18 5:50 ` Vignesh R
2015-12-18 16:42 ` Tony Lindgren
2015-12-11 4:10 ` [PATCH v5 5/5] ARM: dts: AM4372: " Vignesh R
2015-12-21 12:03 ` [PATCH v5 0/5] Add memory mapped read support for ti-qspi Vignesh R
2016-01-05 5:20 ` Vignesh R
2016-01-05 18:19 ` Mark Brown
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