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