mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-05 20:54:31 +00:00
107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
|
|
*/
|
|
|
|
#include <log.h>
|
|
#include <malloc.h>
|
|
#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;
|
|
}
|