diff options
Diffstat (limited to 'cmd/cmd_spi.c')
| -rw-r--r-- | cmd/cmd_spi.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/cmd/cmd_spi.c b/cmd/cmd_spi.c new file mode 100644 index 0000000000..64c3ffcf42 --- /dev/null +++ b/cmd/cmd_spi.c @@ -0,0 +1,174 @@ +/* + * (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); + 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" +); |
