153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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/*
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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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#include "spi-sunxi.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 64 /* 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 1
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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_3
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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_sunxi_spi_xfer(int bus, int cs)
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{
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struct sunxi_spi_slave *spi_slave;
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int ret = 0;
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spi_slave = get_sspi(bus);
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if (spi_slave != NULL) {
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ret = spi_claim_bus(&spi_slave->slave);
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if (ret) {
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printf("Failed to claim SPI bus: %d\n", ret);
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}
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ret = spi_xfer(&spi_slave->slave, bitlen, dout, din, SPI_XFER_END);
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if (ret) {
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printf("Error %d during SPI transaction\n", ret);
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return ret;
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} else {
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int j;
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printf("SPI SEND: \n");
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for (j = 0; j < ((bitlen + 7) / 8); j++)
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printf("%02X", dout[j]);
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printf("\n");
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printf("SPI RECV: \n");
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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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}
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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_sunxi_sspi (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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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_sunxi_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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sunxi_sspi, 5, 1, do_sunxi_sspi,
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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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