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sf: Add extended read commands support

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Current sf uses FAST_READ command, this patch adds support to
use the different/extended read command.

This implementation will determine the fastest command by taking
the supported commands from the flash and the controller, controller
is always been a priority.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
This commit is contained in:
Jagannadha Sutradharudu Teki
2014-01-11 15:10:28 +05:30
parent 12f00caf61
commit 4e09cc1e2c
5 changed files with 126 additions and 86 deletions
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8
include/spi.h
View File

@@ -31,6 +31,12 @@
#define SPI_XFER_MMAP_END 0x10 /* Memory Mapped End */
#define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END)
/* SPI RX operation modes */
#define SPI_OPM_RX_AS 1 << 0
#define SPI_OPM_RX_DOUT 1 << 1
#define SPI_OPM_RX_DIO 1 << 2
#define SPI_OPM_RX_EXTN SPI_OPM_RX_AS | SPI_OPM_RX_DOUT | SPI_OPM_RX_DIO
/* Header byte that marks the start of the message */
#define SPI_PREAMBLE_END_BYTE 0xec
@@ -43,6 +49,7 @@
*
* @bus: ID of the bus that the slave is attached to.
* @cs: ID of the chip select connected to the slave.
* @op_mode_rx: SPI RX operation mode.
* @wordlen: Size of SPI word in number of bits
* @max_write_size: If non-zero, the maximum number of bytes which can
* be written at once, excluding command bytes.
@@ -51,6 +58,7 @@
struct spi_slave {
unsigned int bus;
unsigned int cs;
u8 op_mode_rx;
unsigned int wordlen;
unsigned int max_write_size;
void *memory_map;

10
include/spi_flash.h
View File

@@ -19,6 +19,14 @@
#include <linux/types.h>
#include <linux/compiler.h>
/* Enum list - Extended read commands */
enum spi_read_cmds {
ARRAY_SLOW = 1 << 0,
DUAL_OUTPUT_FAST = 1 << 1,
DUAL_IO_FAST = 1 << 2,
};
#define RD_EXTN ARRAY_SLOW | DUAL_OUTPUT_FAST | DUAL_IO_FAST
/**
* struct spi_flash - SPI flash structure
*
@@ -33,6 +41,7 @@
* @bank_curr: Current flash bank
* @poll_cmd: Poll cmd - for flash erase/program
* @erase_cmd: Erase cmd 4K, 32K, 64K
* @read_cmd: Read cmd - Array Fast and Extn read
* @memory_map: Address of read-only SPI flash access
* @read: Flash read ops: Read len bytes at offset into buf
* Supported cmds: Fast Array Read
@@ -57,6 +66,7 @@ struct spi_flash {
#endif
u8 poll_cmd;
u8 erase_cmd;
u8 read_cmd;
void *memory_map;
int (*read)(struct spi_flash *flash, u32 offset, size_t len, void *buf);