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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/net/ethernet/asix/ax88796c_spi.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/ethernet/asix/ax88796c_spi.c')
-rw-r--r--drivers/net/ethernet/asix/ax88796c_spi.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/net/ethernet/asix/ax88796c_spi.c b/drivers/net/ethernet/asix/ax88796c_spi.c
new file mode 100644
index 000000000..0710e716d
--- /dev/null
+++ b/drivers/net/ethernet/asix/ax88796c_spi.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2010 ASIX Electronics Corporation
+ * Copyright (c) 2020 Samsung Electronics Co., Ltd.
+ *
+ * ASIX AX88796C SPI Fast Ethernet Linux driver
+ */
+
+#define pr_fmt(fmt) "ax88796c: " fmt
+
+#include <linux/string.h>
+#include <linux/spi/spi.h>
+
+#include "ax88796c_spi.h"
+
+const u8 ax88796c_rx_cmd_buf[5] = {AX_SPICMD_READ_RXQ, 0xFF, 0xFF, 0xFF, 0xFF};
+const u8 ax88796c_tx_cmd_buf[4] = {AX_SPICMD_WRITE_TXQ, 0xFF, 0xFF, 0xFF};
+
+/* driver bus management functions */
+int axspi_wakeup(struct axspi_data *ax_spi)
+{
+ int ret;
+
+ ax_spi->cmd_buf[0] = AX_SPICMD_EXIT_PWD; /* OP */
+ ret = spi_write(ax_spi->spi, ax_spi->cmd_buf, 1);
+ if (ret)
+ dev_err(&ax_spi->spi->dev, "%s() failed: ret = %d\n", __func__, ret);
+ return ret;
+}
+
+int axspi_read_status(struct axspi_data *ax_spi, struct spi_status *status)
+{
+ int ret;
+
+ /* OP */
+ ax_spi->cmd_buf[0] = AX_SPICMD_READ_STATUS;
+ ret = spi_write_then_read(ax_spi->spi, ax_spi->cmd_buf, 1, (u8 *)status, 3);
+ if (ret)
+ dev_err(&ax_spi->spi->dev, "%s() failed: ret = %d\n", __func__, ret);
+ else
+ le16_to_cpus(&status->isr);
+
+ return ret;
+}
+
+int axspi_read_rxq(struct axspi_data *ax_spi, void *data, int len)
+{
+ struct spi_transfer *xfer = ax_spi->spi_rx_xfer;
+ int ret;
+
+ memcpy(ax_spi->cmd_buf, ax88796c_rx_cmd_buf, 5);
+
+ xfer->tx_buf = ax_spi->cmd_buf;
+ xfer->rx_buf = NULL;
+ xfer->len = ax_spi->comp ? 2 : 5;
+ xfer->bits_per_word = 8;
+ spi_message_add_tail(xfer, &ax_spi->rx_msg);
+
+ xfer++;
+ xfer->rx_buf = data;
+ xfer->tx_buf = NULL;
+ xfer->len = len;
+ xfer->bits_per_word = 8;
+ spi_message_add_tail(xfer, &ax_spi->rx_msg);
+ ret = spi_sync(ax_spi->spi, &ax_spi->rx_msg);
+ if (ret)
+ dev_err(&ax_spi->spi->dev, "%s() failed: ret = %d\n", __func__, ret);
+
+ return ret;
+}
+
+int axspi_write_txq(const struct axspi_data *ax_spi, void *data, int len)
+{
+ return spi_write(ax_spi->spi, data, len);
+}
+
+u16 axspi_read_reg(struct axspi_data *ax_spi, u8 reg)
+{
+ int ret;
+ int len = ax_spi->comp ? 3 : 4;
+
+ ax_spi->cmd_buf[0] = 0x03; /* OP code read register */
+ ax_spi->cmd_buf[1] = reg; /* register address */
+ ax_spi->cmd_buf[2] = 0xFF; /* dumy cycle */
+ ax_spi->cmd_buf[3] = 0xFF; /* dumy cycle */
+ ret = spi_write_then_read(ax_spi->spi,
+ ax_spi->cmd_buf, len,
+ ax_spi->rx_buf, 2);
+ if (ret) {
+ dev_err(&ax_spi->spi->dev,
+ "%s() failed: ret = %d\n", __func__, ret);
+ return 0xFFFF;
+ }
+
+ le16_to_cpus((u16 *)ax_spi->rx_buf);
+
+ return *(u16 *)ax_spi->rx_buf;
+}
+
+int axspi_write_reg(struct axspi_data *ax_spi, u8 reg, u16 value)
+{
+ int ret;
+
+ memset(ax_spi->cmd_buf, 0, sizeof(ax_spi->cmd_buf));
+ ax_spi->cmd_buf[0] = AX_SPICMD_WRITE_REG; /* OP code read register */
+ ax_spi->cmd_buf[1] = reg; /* register address */
+ ax_spi->cmd_buf[2] = value;
+ ax_spi->cmd_buf[3] = value >> 8;
+
+ ret = spi_write(ax_spi->spi, ax_spi->cmd_buf, 4);
+ if (ret)
+ dev_err(&ax_spi->spi->dev, "%s() failed: ret = %d\n", __func__, ret);
+ return ret;
+}
+