spi.c
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/*
* (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 <dm.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 ret = 0;
#ifdef CONFIG_DM_SPI
char name[30], *str;
struct udevice *dev;
snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
str = strdup(name);
if (!str)
return -ENOMEM;
ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
str, &dev, &slave);
if (ret)
return ret;
#else
slave = spi_setup_slave(bus, cs, 1000000, mode);
if (!slave) {
printf("Invalid device %d:%d\n", bus, cs);
return -EINVAL;
}
#endif
ret = spi_claim_bus(slave);
if (ret)
goto done;
ret = spi_xfer(slave, bitlen, dout, din,
SPI_XFER_BEGIN | SPI_XFER_END);
#ifndef CONFIG_DM_SPI
/* We don't get an error code in this case */
if (ret)
ret = -EIO;
#endif
if (ret) {
printf("Error %d during SPI transaction\n", ret);
} else {
int j;
for (j = 0; j < ((bitlen + 7) / 8); j++)
printf("%02X", din[j]);
printf("\n");
}
done:
spi_release_bus(slave);
#ifndef CONFIG_DM_SPI
spi_free_slave(slave);
#endif
return ret;
}
/*
* 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"
);