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4b6a5388da
On cmpc885 board, the ethernet addresses are stored in an EEPROM that is accessed through SPI. A 3 bytes command is sent to the chip then the content gets read. At the time being a single block access is performed, ignoring the first 3 bytes read. Reword the SPI transfer to first send 3 bytes then receive the content of the EEPROM so that there don't be 3 dummy bytes at the beginning of the buffer. And move the function into common.c so that it can be reused by the board that will be added in a future patch. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
97 lines
2 KiB
C
97 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2010-2020 CS Group
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* Charles Frey <charles.frey@c-s.fr>
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* Florent Trinh Thai <florent.trinh-thai@c-s.fr>
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* Christophe Leroy <christophe.leroy@c-s.fr>
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*
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* Common specific routines for the CS Group boards
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*/
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#include <dm.h>
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#include <fdt_support.h>
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#include <spi.h>
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#define SPI_EEPROM_READ 0x03
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static int fdt_set_node_and_value(void *blob, char *node, const char *prop,
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void *var, int size)
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{
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int ret, off;
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off = fdt_path_offset(blob, node);
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if (off < 0) {
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printf("Cannot find %s node err:%s\n", node, fdt_strerror(off));
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return off;
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}
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ret = fdt_setprop(blob, off, prop, var, size);
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if (ret < 0)
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printf("Cannot set %s/%s prop err: %s\n", node, prop, fdt_strerror(ret));
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return ret;
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}
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/* Checks front/rear id and remove unneeded nodes from the blob */
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void ft_cleanup(void *blob, unsigned long id, const char *prop, const char *compatible)
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{
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int off;
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off = fdt_node_offset_by_compatible(blob, -1, compatible);
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while (off != -FDT_ERR_NOTFOUND) {
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const struct fdt_property *ids;
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int nb_ids, idx;
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int tmp = -1;
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ids = fdt_get_property(blob, off, prop, &nb_ids);
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for (idx = 0; idx < nb_ids; idx += 4) {
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if (*((uint32_t *)&ids->data[idx]) == id)
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break;
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}
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if (idx >= nb_ids)
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fdt_del_node(blob, off);
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else
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tmp = off;
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off = fdt_node_offset_by_compatible(blob, tmp, compatible);
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}
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fdt_set_node_and_value(blob, "/", prop, &id, sizeof(uint32_t));
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}
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int read_eeprom(u8 *din, int len)
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{
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struct udevice *eeprom;
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struct spi_slave *slave;
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uchar dout[3] = {SPI_EEPROM_READ, 0, 0};
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int ret;
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ret = uclass_get_device(UCLASS_SPI, 0, &eeprom);
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if (ret)
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return ret;
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ret = _spi_get_bus_and_cs(0, 0, 1000000, 0, "spi_generic_drv",
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"generic_0:0", &eeprom, &slave);
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if (ret)
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return ret;
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ret = spi_claim_bus(slave);
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ret = spi_xfer(slave, sizeof(dout) << 3, dout, NULL, SPI_XFER_BEGIN);
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if (ret)
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return ret;
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ret = spi_xfer(slave, len << 3, NULL, din, SPI_XFER_END);
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if (ret)
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return ret;
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spi_release_bus(slave);
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return 0;
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}
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