[U-Boot] [RFC PATCH v2 03/11] spi: Add non DM version of SPI_MEM

Vignesh R
2018-12-04T12:26:51Z

Add non DM version of SPI_MEM to support easy migration to new SPI NOR
framework. This can be removed once DM_SPI conversion is complete.

Signed-off-by: Vignesh R <vigneshr@ti.com>
---
drivers/spi/Kconfig | 4 +-
drivers/spi/Makefile | 1 +
drivers/spi/spi-mem-nodm.c | 89 ++++++++++++++++++++++++++++++++++++++
3 files changed, 92 insertions(+), 2 deletions(-)
create mode 100644 drivers/spi/spi-mem-nodm.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 516188ea88e1..de334a33a283 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -16,8 +16,6 @@ config DM_SPI
typically use driver-private data instead of extending the
spi_slave structure.

-if DM_SPI
-
config SPI_MEM
bool "SPI memory extension"
help
@@ -25,6 +23,8 @@ config SPI_MEM
This extension is meant to simplify interaction with SPI memories
by providing an high-level interface to send memory-like commands.

+if DM_SPI
+
config ALTERA_SPI
bool "Altera SPI driver"
help
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 7242ea7e4045..66666b26133f 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_SOFT_SPI) += soft_spi.o
obj-$(CONFIG_SPI_MEM) += spi-mem.o
else
obj-y += spi.o
+obj-$(CONFIG_SPI_MEM) += spi-mem-nodm.o
obj-$(CONFIG_SOFT_SPI) += soft_spi_legacy.o
endif

diff --git a/drivers/spi/spi-mem-nodm.c b/drivers/spi/spi-mem-nodm.c
new file mode 100644
index 000000000000..4d91761f56d3
--- /dev/null
+++ b/drivers/spi/spi-mem-nodm.c
@@ -0,0 +1,89 @@
+// 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)
+{
+ return 0;
+}
--
2.19.2