175 lines
3.6 KiB
C
175 lines
3.6 KiB
C
/*
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* (C) Copyright 2002
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* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* SPI Read/Write Utilities
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*/
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#include <common.h>
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#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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/*-----------------------------------------------------------------------
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* Definitions
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*/
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#ifndef MAX_SPI_BYTES
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# define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
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#endif
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#ifndef CONFIG_DEFAULT_SPI_BUS
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# define CONFIG_DEFAULT_SPI_BUS 0
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#endif
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#ifndef CONFIG_DEFAULT_SPI_MODE
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# define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0
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#endif
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/*
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* Values from last command.
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*/
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static unsigned int bus;
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static unsigned int cs;
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static unsigned int mode;
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static int bitlen;
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static uchar dout[MAX_SPI_BYTES];
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static uchar din[MAX_SPI_BYTES];
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static int do_spi_xfer(int bus, int cs)
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{
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struct spi_slave *slave;
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int ret = 0;
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#ifdef CONFIG_DM_SPI
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char name[30], *str;
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struct udevice *dev;
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snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
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str = strdup(name);
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ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
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str, &dev, &slave);
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if (ret)
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return ret;
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#else
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slave = spi_setup_slave(bus, cs, 1000000, mode);
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if (!slave) {
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printf("Invalid device %d:%d\n", bus, cs);
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return -EINVAL;
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}
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#endif
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ret = spi_claim_bus(slave);
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if (ret)
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goto done;
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ret = spi_xfer(slave, bitlen, dout, din,
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SPI_XFER_BEGIN | SPI_XFER_END);
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#ifndef CONFIG_DM_SPI
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/* We don't get an error code in this case */
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if (ret)
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ret = -EIO;
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#endif
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if (ret) {
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printf("Error %d during SPI transaction\n", ret);
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} else {
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int j;
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for (j = 0; j < ((bitlen + 7) / 8); j++)
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printf("%02X", din[j]);
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printf("\n");
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}
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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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/*
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* SPI read/write
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*
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* Syntax:
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* spi {dev} {num_bits} {dout}
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* {dev} is the device number for controlling chip select (see TBD)
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* {num_bits} is the number of bits to send & receive (base 10)
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* {dout} is a hexadecimal string of data to send
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* The command prints out the hexadecimal string received via SPI.
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*/
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int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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char *cp = 0;
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uchar tmp;
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int j;
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/*
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* We use the last specified parameters, unless new ones are
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* entered.
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*/
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if ((flag & CMD_FLAG_REPEAT) == 0)
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{
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if (argc >= 2) {
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mode = CONFIG_DEFAULT_SPI_MODE;
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bus = simple_strtoul(argv[1], &cp, 10);
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if (*cp == ':') {
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cs = simple_strtoul(cp+1, &cp, 10);
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} else {
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cs = bus;
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bus = CONFIG_DEFAULT_SPI_BUS;
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}
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if (*cp == '.')
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mode = simple_strtoul(cp+1, NULL, 10);
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}
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if (argc >= 3)
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bitlen = simple_strtoul(argv[2], NULL, 10);
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if (argc >= 4) {
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cp = argv[3];
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for(j = 0; *cp; j++, cp++) {
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tmp = *cp - '0';
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if(tmp > 9)
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tmp -= ('A' - '0') - 10;
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if(tmp > 15)
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tmp -= ('a' - 'A');
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if(tmp > 15) {
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printf("Hex conversion error on %c\n", *cp);
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return 1;
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}
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if((j % 2) == 0)
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dout[j / 2] = (tmp << 4);
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else
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dout[j / 2] |= tmp;
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}
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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\n", 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(
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sspi, 5, 1, do_spi,
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"SPI utility command",
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"[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
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"<bus> - Identifies the SPI bus\n"
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"<cs> - Identifies the chip select\n"
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"<mode> - Identifies the SPI mode to use\n"
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"<bit_len> - Number of bits to send (base 10)\n"
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"<dout> - Hexadecimal string that gets sent"
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);
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