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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
*/
#include <spi.h>
#include <spi-mem.h>
int spi_mem_exec_op(struct spi_slave *slave,
const struct spi_mem_op *op)
{
unsigned int pos = 0;
const u8 *tx_buf = NULL;
u8 *rx_buf = NULL;
u8 *op_buf;
int op_len;
u32 flag;
int ret;
int i;
if (op->data.nbytes) {
if (op->data.dir == SPI_MEM_DATA_IN)
rx_buf = op->data.buf.in;
else
tx_buf = op->data.buf.out;
}
op_len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes;
op_buf = calloc(1, op_len);
ret = spi_claim_bus(slave);
if (ret < 0)
return ret;
op_buf[pos++] = op->cmd.opcode;
if (op->addr.nbytes) {
for (i = 0; i < op->addr.nbytes; i++)
op_buf[pos + i] = op->addr.val >>
(8 * (op->addr.nbytes - i - 1));
pos += op->addr.nbytes;
}
if (op->dummy.nbytes)
memset(op_buf + pos, 0xff, op->dummy.nbytes);
/* 1st transfer: opcode + address + dummy cycles */
flag = SPI_XFER_BEGIN;
/* Make sure to set END bit if no tx or rx data messages follow */
if (!tx_buf && !rx_buf)
flag |= SPI_XFER_END;
ret = spi_xfer(slave, op_len * 8, op_buf, NULL, flag);
if (ret)
return ret;
/* 2nd transfer: rx or tx data path */
if (tx_buf || rx_buf) {
ret = spi_xfer(slave, op->data.nbytes * 8, tx_buf,
rx_buf, SPI_XFER_END);
if (ret)
return ret;
}
spi_release_bus(slave);
for (i = 0; i < pos; i++)
debug("%02x ", op_buf[i]);
debug("| [%dB %s] ",
tx_buf || rx_buf ? op->data.nbytes : 0,
tx_buf || rx_buf ? (tx_buf ? "out" : "in") : "-");
for (i = 0; i < op->data.nbytes; i++)
debug("%02x ", tx_buf ? tx_buf[i] : rx_buf[i]);
debug("[ret %d]\n", ret);
free(op_buf);
if (ret < 0)
return ret;
return 0;
}
int spi_mem_adjust_op_size(struct spi_slave *slave,
struct spi_mem_op *op)
{
unsigned int len;
len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes;
if (slave->max_write_size && len > slave->max_write_size)
return -EINVAL;
if (op->data.dir == SPI_MEM_DATA_IN && slave->max_read_size)
op->data.nbytes = min(op->data.nbytes,
slave->max_read_size);
else if (slave->max_write_size)
op->data.nbytes = min(op->data.nbytes,
slave->max_write_size - len);
if (!op->data.nbytes)
return -EINVAL;
return 0;
}
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