mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
df3b23ae3a
In preparation for changing the error handling in this code for driver model, move it into its own function. Reviewed-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Signed-off-by: Simon Glass <sjg@chromium.org>
151 lines
3.2 KiB
C
151 lines
3.2 KiB
C
/*
|
|
* (C) Copyright 2002
|
|
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/*
|
|
* SPI Read/Write Utilities
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <errno.h>
|
|
#include <spi.h>
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* Definitions
|
|
*/
|
|
|
|
#ifndef MAX_SPI_BYTES
|
|
# define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
|
|
#endif
|
|
|
|
#ifndef CONFIG_DEFAULT_SPI_BUS
|
|
# define CONFIG_DEFAULT_SPI_BUS 0
|
|
#endif
|
|
#ifndef CONFIG_DEFAULT_SPI_MODE
|
|
# define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0
|
|
#endif
|
|
|
|
/*
|
|
* Values from last command.
|
|
*/
|
|
static unsigned int bus;
|
|
static unsigned int cs;
|
|
static unsigned int mode;
|
|
static int bitlen;
|
|
static uchar dout[MAX_SPI_BYTES];
|
|
static uchar din[MAX_SPI_BYTES];
|
|
|
|
static int do_spi_xfer(int bus, int cs)
|
|
{
|
|
struct spi_slave *slave;
|
|
int rcode = 0;
|
|
|
|
slave = spi_setup_slave(bus, cs, 1000000, mode);
|
|
if (!slave) {
|
|
printf("Invalid device %d:%d\n", bus, cs);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spi_claim_bus(slave);
|
|
if (spi_xfer(slave, bitlen, dout, din,
|
|
SPI_XFER_BEGIN | SPI_XFER_END) != 0) {
|
|
printf("Error during SPI transaction\n");
|
|
rcode = -EIO;
|
|
} else {
|
|
int j;
|
|
|
|
for (j = 0; j < ((bitlen + 7) / 8); j++)
|
|
printf("%02X", din[j]);
|
|
printf("\n");
|
|
}
|
|
spi_release_bus(slave);
|
|
spi_free_slave(slave);
|
|
|
|
return rcode;
|
|
}
|
|
|
|
/*
|
|
* SPI read/write
|
|
*
|
|
* Syntax:
|
|
* spi {dev} {num_bits} {dout}
|
|
* {dev} is the device number for controlling chip select (see TBD)
|
|
* {num_bits} is the number of bits to send & receive (base 10)
|
|
* {dout} is a hexadecimal string of data to send
|
|
* The command prints out the hexadecimal string received via SPI.
|
|
*/
|
|
|
|
int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
|
|
{
|
|
char *cp = 0;
|
|
uchar tmp;
|
|
int j;
|
|
|
|
/*
|
|
* We use the last specified parameters, unless new ones are
|
|
* entered.
|
|
*/
|
|
|
|
if ((flag & CMD_FLAG_REPEAT) == 0)
|
|
{
|
|
if (argc >= 2) {
|
|
mode = CONFIG_DEFAULT_SPI_MODE;
|
|
bus = simple_strtoul(argv[1], &cp, 10);
|
|
if (*cp == ':') {
|
|
cs = simple_strtoul(cp+1, &cp, 10);
|
|
} else {
|
|
cs = bus;
|
|
bus = CONFIG_DEFAULT_SPI_BUS;
|
|
}
|
|
if (*cp == '.')
|
|
mode = simple_strtoul(cp+1, NULL, 10);
|
|
}
|
|
if (argc >= 3)
|
|
bitlen = simple_strtoul(argv[2], NULL, 10);
|
|
if (argc >= 4) {
|
|
cp = argv[3];
|
|
for(j = 0; *cp; j++, cp++) {
|
|
tmp = *cp - '0';
|
|
if(tmp > 9)
|
|
tmp -= ('A' - '0') - 10;
|
|
if(tmp > 15)
|
|
tmp -= ('a' - 'A');
|
|
if(tmp > 15) {
|
|
printf("Hex conversion error on %c\n", *cp);
|
|
return 1;
|
|
}
|
|
if((j % 2) == 0)
|
|
dout[j / 2] = (tmp << 4);
|
|
else
|
|
dout[j / 2] |= tmp;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
|
|
printf("Invalid bitlen %d\n", bitlen);
|
|
return 1;
|
|
}
|
|
|
|
if (do_spi_xfer(bus, cs))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/***************************************************/
|
|
|
|
U_BOOT_CMD(
|
|
sspi, 5, 1, do_spi,
|
|
"SPI utility command",
|
|
"[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
|
|
"<bus> - Identifies the SPI bus\n"
|
|
"<cs> - Identifies the chip select\n"
|
|
"<mode> - Identifies the SPI mode to use\n"
|
|
"<bit_len> - Number of bits to send (base 10)\n"
|
|
"<dout> - Hexadecimal string that gets sent"
|
|
);
|