Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2024-11-10 23:24:38 +00:00
Code Issues Projects Releases Packages Wiki Activity

spi: nxp-fspi: Add support for IP read only

Browse source 
Add support for disabling AHB bus and read entire flash contents via IP
bus only. Please note, this enables IP bus read using a quirk which can
be enabled directly in device-type data or in existence of an errata
where AHB bus may need to be disabled.

Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Kuldeep Singh 2021-08-03 14:32:57 +05:30 committed by Jagan Teki
parent 85886161ef
commit e8751a9387
1 changed files with 20 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
drivers/spi/nxp_fspi.c
View file

@ -304,6 +304,9 @@
#define POLL_TOUT 5000
#define NXP_FSPI_MAX_CHIPSELECT 4
/* Access flash memory using IP bus only */
#define FSPI_QUIRK_USE_IP_ONLY BIT(0)
struct nxp_fspi_devtype_data {
unsigned int rxfifo;
unsigned int txfifo;
@ -338,6 +341,11 @@ struct nxp_fspi {
const struct nxp_fspi_devtype_data *devtype_data;
};
static inline int needs_ip_only(struct nxp_fspi *f)
{
return f->devtype_data->quirks & FSPI_QUIRK_USE_IP_ONLY;
}
/*
* R/W functions for big- or little-endian registers:
* The FSPI controller's endianness is independent of
@ -769,12 +777,14 @@ static int nxp_fspi_exec_op(struct spi_slave *slave,
nxp_fspi_prepare_lut(f, op);
/*
* If we have large chunks of data, we read them through the AHB bus
* by accessing the mapped memory. In all other cases we use
* IP commands to access the flash.
* If we have large chunks of data, we read them through the AHB bus by
* accessing the mapped memory. In all other cases we use IP commands
* to access the flash. Read via AHB bus may be corrupted due to
* existence of an errata and therefore discard AHB read in such cases.
*/
if (op->data.nbytes > (f->devtype_data->rxfifo - 4) &&
op->data.dir == SPI_MEM_DATA_IN) {
op->data.dir == SPI_MEM_DATA_IN &&
!needs_ip_only(f)) {
nxp_fspi_read_ahb(f, op);
} else {
if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT)
@ -808,6 +818,12 @@ static int nxp_fspi_adjust_op_size(struct spi_slave *slave,
op->data.nbytes = ALIGN_DOWN(op->data.nbytes, 8);
}
/* Limit data bytes to RX FIFO in case of IP read only */
if (needs_ip_only(f) &&
op->data.dir == SPI_MEM_DATA_IN &&
op->data.nbytes > f->devtype_data->rxfifo)
op->data.nbytes = f->devtype_data->rxfifo;
return 0;
}