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spi: spi-mem: allow specifying a command's extension

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In xSPI mode, flashes expect 2-byte opcodes. The second byte is called
the "command extension". There can be 3 types of extensions in xSPI:
repeat, invert, and hex. When the extension type is "repeat", the same
opcode is sent twice. When it is "invert", the second byte is the
inverse of the opcode. When it is "hex" an additional opcode byte based
is sent with the command whose value can be anything.

So, make opcode a 16-bit value and add a 'nbytes', similar to how
multiple address widths are handled.

All usages of sizeof(op->cmd.opcode) also need to be changed to be
op->cmd.nbytes because that is the actual indicator of opcode size.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Pratyush Yadav 2021-06-26 00:47:04 +05:30 • committed by Jagan Teki
parent a1eb40b70b
commit d15de62301
4 changed files with 15 additions and 11 deletions
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6
include/spi-mem.h
View file

@ -17,6 +17,7 @@ struct udevice;
{ \
.buswidth = __buswidth, \
.opcode = __opcode, \
.nbytes = 1, \
}
#define SPI_MEM_OP_ADDR(__nbytes, __val, __buswidth) \
@ -69,6 +70,8 @@ enum spi_mem_data_dir {
/**
* struct spi_mem_op - describes a SPI memory operation
* @cmd.nbytes: number of opcode bytes (only 1 or 2 are valid). The opcode is
* sent MSB-first.
* @cmd.buswidth: number of IO lines used to transmit the command
* @cmd.opcode: operation opcode
* @cmd.dtr: whether the command opcode should be sent in DTR mode or not
@ -92,9 +95,10 @@ enum spi_mem_data_dir {
*/
struct spi_mem_op {
struct {
u8 nbytes;
u8 buswidth;
u8 opcode;
u8 dtr : 1;
u16 opcode;
} cmd;
struct {