mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 23:12:32 +00:00
47 lines
1.4 KiB
Diff
47 lines
1.4 KiB
Diff
From 08922f644878c9163ada8df3ef9def89be1d5e90 Mon Sep 17 00:00:00 2001
|
|
From: Vignesh R <vigneshr@ti.com>
|
|
Date: Tue, 29 Mar 2016 11:16:17 +0530
|
|
Subject: [PATCH] mtd: devices: m25p80: add support for mmap read request
|
|
|
|
Certain SPI controllers may provide accelerated hardware interface to
|
|
read from m25p80 type flash devices in order to provide better read
|
|
performance. SPI core supports such devices with spi_flash_read() API.
|
|
Call spi_flash_read(), if supported, to make use of such interface.
|
|
|
|
Signed-off-by: Vignesh R <vigneshr@ti.com>
|
|
[Brian: add memset()]
|
|
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
|
|
---
|
|
|
|
--- a/drivers/mtd/devices/m25p80.c
|
|
+++ b/drivers/mtd/devices/m25p80.c
|
|
@@ -131,6 +131,28 @@ static int m25p80_read(struct spi_nor *n
|
|
/* 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;
|
|
+
|
|
+ memset(&msg, 0, sizeof(msg));
|
|
+
|
|
+ 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));
|
|
|