mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
175 lines
3.6 KiB
C
175 lines
3.6 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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/*-----------------------------------------------------------------------
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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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if (!str)
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return -ENOMEM;
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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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