1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
10 int spi_mem_exec_op(struct spi_slave *slave,
11 const struct spi_mem_op *op)
14 const u8 *tx_buf = NULL;
22 if (op->data.nbytes) {
23 if (op->data.dir == SPI_MEM_DATA_IN)
24 rx_buf = op->data.buf.in;
26 tx_buf = op->data.buf.out;
29 op_len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes;
30 op_buf = calloc(1, op_len);
32 ret = spi_claim_bus(slave);
36 op_buf[pos++] = op->cmd.opcode;
38 if (op->addr.nbytes) {
39 for (i = 0; i < op->addr.nbytes; i++)
40 op_buf[pos + i] = op->addr.val >>
41 (8 * (op->addr.nbytes - i - 1));
43 pos += op->addr.nbytes;
47 memset(op_buf + pos, 0xff, op->dummy.nbytes);
49 /* 1st transfer: opcode + address + dummy cycles */
50 flag = SPI_XFER_BEGIN;
51 /* Make sure to set END bit if no tx or rx data messages follow */
52 if (!tx_buf && !rx_buf)
55 ret = spi_xfer(slave, op_len * 8, op_buf, NULL, flag);
59 /* 2nd transfer: rx or tx data path */
60 if (tx_buf || rx_buf) {
61 ret = spi_xfer(slave, op->data.nbytes * 8, tx_buf,
62 rx_buf, SPI_XFER_END);
67 spi_release_bus(slave);
69 for (i = 0; i < pos; i++)
70 debug("%02x ", op_buf[i]);
72 tx_buf || rx_buf ? op->data.nbytes : 0,
73 tx_buf || rx_buf ? (tx_buf ? "out" : "in") : "-");
74 for (i = 0; i < op->data.nbytes; i++)
75 debug("%02x ", tx_buf ? tx_buf[i] : rx_buf[i]);
76 debug("[ret %d]\n", ret);
86 int spi_mem_adjust_op_size(struct spi_slave *slave,
87 struct spi_mem_op *op)
91 len = sizeof(op->cmd.opcode) + op->addr.nbytes + op->dummy.nbytes;
92 if (slave->max_write_size && len > slave->max_write_size)
95 if (op->data.dir == SPI_MEM_DATA_IN && slave->max_read_size)
96 op->data.nbytes = min(op->data.nbytes,
97 slave->max_read_size);
98 else if (slave->max_write_size)
99 op->data.nbytes = min(op->data.nbytes,
100 slave->max_write_size - len);
102 if (!op->data.nbytes)