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cmd/spi.c
3.64 KB
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * (C) Copyright 2002 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com |
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*/ /* * SPI Read/Write Utilities */ #include <common.h> #include <command.h> |
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#include <dm.h> |
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#include <errno.h> |
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#include <spi.h> |
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/*----------------------------------------------------------------------- * Definitions */ #ifndef MAX_SPI_BYTES # define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */ #endif |
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/* * Values from last command. */ |
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static unsigned int bus; static unsigned int cs; static unsigned int mode; |
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static unsigned int freq; |
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static int bitlen; static uchar dout[MAX_SPI_BYTES]; static uchar din[MAX_SPI_BYTES]; |
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static int do_spi_xfer(int bus, int cs) { struct spi_slave *slave; |
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int ret = 0; |
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#ifdef CONFIG_DM_SPI char name[30], *str; struct udevice *dev; snprintf(name, sizeof(name), "generic_%d:%d", bus, cs); str = strdup(name); |
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if (!str) return -ENOMEM; |
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ret = spi_get_bus_and_cs(bus, cs, freq, mode, "spi_generic_drv", |
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str, &dev, &slave); if (ret) return ret; #else |
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slave = spi_setup_slave(bus, cs, freq, mode); |
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if (!slave) { printf("Invalid device %d:%d ", bus, cs); return -EINVAL; } |
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#endif |
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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 ", ret); |
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} else { int j; for (j = 0; j < ((bitlen + 7) / 8); j++) printf("%02X", din[j]); printf(" "); } |
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done: |
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spi_release_bus(slave); |
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#ifndef CONFIG_DM_SPI |
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spi_free_slave(slave); |
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#endif |
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return ret; |
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} |
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/* * 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. */ |
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int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) |
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{ char *cp = 0; uchar tmp; int j; |
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/* * We use the last specified parameters, unless new ones are * entered. */ |
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if (freq == 0) freq = 1000000; |
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if ((flag & CMD_FLAG_REPEAT) == 0) { |
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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; } |
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if (*cp == '.') |
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mode = simple_strtoul(cp+1, &cp, 10); if (*cp == '@') freq = simple_strtoul(cp+1, &cp, 10); |
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} |
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if (argc >= 3) bitlen = simple_strtoul(argv[2], NULL, 10); |
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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) { |
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printf("Hex conversion error on %c ", *cp); |
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return 1; } if((j % 2) == 0) dout[j / 2] = (tmp << 4); else dout[j / 2] |= tmp; |
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} |
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} } |
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if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) { |
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printf("Invalid bitlen %d ", bitlen); |
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return 1; |
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} |
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if (do_spi_xfer(bus, cs)) |
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return 1; |
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return 0; |
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} |
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/***************************************************/ |
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U_BOOT_CMD( sspi, 5, 1, do_spi, |
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"SPI utility command", |
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"[<bus>:]<cs>[.<mode>][@<freq>] <bit_len> <dout> - Send and receive bits " |
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"<bus> - Identifies the SPI bus " "<cs> - Identifies the chip select " "<mode> - Identifies the SPI mode to use " |
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"<freq> - Identifies the SPI bus frequency in Hz " |
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"<bit_len> - Number of bits to send (base 10) " |
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"<dout> - Hexadecimal string that gets sent" |
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); |