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Commit 08922f64 authored by Vignesh R's avatar Vignesh R Committed by Brian Norris
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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: default avatarVignesh R <vigneshr@ti.com>
[Brian: add memset()]
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 5651d6aa

drivers/mtd/devices/m25p80.c

+22 −0
Original line number Diff line number Diff line
@@ -131,6 +131,28 @@ 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;



		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));