[PATCH 07/10] drivers/net/ksz8864rmn: add driver for Micrel KSZ8864RMN Ethernet Switch
Jan Luebbe
jlu at pengutronix.de
Mon Sep 3 07:46:02 EDT 2012
It start the switch and provides basic access to the registers.
This driver could also work with some other Micrel switches, possibly
with some small changes.
Signed-off-by: Jan Luebbe <jlu at pengutronix.de>
---
drivers/net/Kconfig | 7 ++
drivers/net/Makefile | 1 +
drivers/net/ksz8864rmn.c | 233 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 241 insertions(+)
create mode 100644 drivers/net/ksz8864rmn.c
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 749ea6a..0fa4f14 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -126,5 +126,12 @@ config DRIVER_NET_DESIGNWARE_ALTDESCRIPTOR
source "drivers/net/usb/Kconfig"
+config DRIVER_NET_MICREL
+ depends on SPI
+ bool "Micrel KSZ8864RMN Ethernet Switch driver"
+ help
+ This option enables support for enabling the Micrel
+ KSZ8864RMN Ethernet Switch over SPI.
+
endmenu
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 29727b7..b589240 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -14,3 +14,4 @@ obj-$(CONFIG_NET_USB) += usb/
obj-$(CONFIG_DRIVER_NET_TSE) += altera_tse.o
obj-$(CONFIG_DRIVER_NET_KS8851_MLL) += ks8851_mll.o
obj-$(CONFIG_DRIVER_NET_DESIGNWARE) += designware.o
+obj-$(CONFIG_DRIVER_NET_MICREL) += ksz8864rmn.o
diff --git a/drivers/net/ksz8864rmn.c b/drivers/net/ksz8864rmn.c
new file mode 100644
index 0000000..5851463
--- /dev/null
+++ b/drivers/net/ksz8864rmn.c
@@ -0,0 +1,233 @@
+/*
+ * Copyright (C) 2012 Jan Luebbe, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <common.h>
+#include <init.h>
+#include <driver.h>
+#include <spi/spi.h>
+#include <errno.h>
+
+#define REG_ID0 0x00
+#define REG_ID1 0x01
+
+#define REG_GC00 0x02
+#define REG_GC01 0x03
+#define REG_GC02 0x04
+#define REG_GC03 0x05
+#define REG_GC04 0x06
+#define REG_GC05 0x07
+#define REG_GC06 0x08
+#define REG_GC07 0x09
+#define REG_GC08 0x0a
+#define REG_GC09 0x0b
+#define REG_GC10 0x0c
+#define REG_GC11 0x0d
+
+#define REG_PSTAT1(p) (0x10 * p + 0xe)
+#define REG_PSTAT2(p) (0x10 * p + 0xf)
+
+#define CMD_WRITE 0x02
+#define CMD_READ 0x03
+
+struct micrel_switch_priv {
+ struct cdev cdev;
+ struct spi_device *spi;
+};
+
+static int micrel_switch_read_reg(struct spi_device *spi, uint8_t reg)
+{
+ uint8_t tx[2];
+ uint8_t rx[1];
+ int ret;
+
+ tx[0] = CMD_READ;
+ tx[1] = reg;
+
+ ret = spi_write_then_read(spi, tx, 2, rx, 1);
+ if (ret < 0)
+ return ret;
+
+ return rx[0];
+}
+
+static void micrel_switch_write_reg(struct spi_device *spi, uint8_t reg, uint8_t val)
+{
+ uint8_t tx[3];
+
+ tx[0] = CMD_WRITE;
+ tx[1] = reg;
+ tx[2] = val;
+
+ spi_write_then_read(spi, tx, 3, NULL, 0);
+}
+
+static int micrel_switch_enable_set(struct device_d *dev, struct param_d *param,
+ const char *val)
+{
+ struct spi_device *spi = (struct spi_device *)dev->type_data;
+ int enable;
+ char *new;
+
+ if (!val)
+ return dev_param_set_generic(dev, param, NULL);
+
+ enable = simple_strtoul(val, NULL, 0);
+
+ if (enable) {
+ micrel_switch_write_reg(spi, REG_ID1, 1);
+ new = "1";
+ } else {
+ micrel_switch_write_reg(spi, REG_ID1, 0);
+ new = "0";
+ }
+
+ dev_param_set_generic(dev, param, new);
+
+ return 0;
+}
+
+static void micrel_switch_print_reg(struct spi_device *spi, const char *name, uint8_t reg)
+{
+ uint8_t tx[2];
+ uint8_t rx[1];
+ int ret;
+
+ tx[0] = CMD_READ;
+ tx[1] = reg;
+
+ ret = spi_write_then_read(spi, tx, 2, rx, 1);
+ if (ret < 0)
+ printf("%s at 0x%02x: SPI error\n", name, reg);
+
+ printf("%s at 0x%02x: 0x%02x\n", name, reg, rx[0]);
+}
+
+static void micrel_switch_info(struct device_d *dev)
+{
+ struct spi_device *spi = (struct spi_device *)dev->type_data;
+
+ printf("Registers:\n");
+ micrel_switch_print_reg(spi, " Chip ID 0", REG_ID0);
+ micrel_switch_print_reg(spi, " Chip ID 1", REG_ID1);
+ micrel_switch_print_reg(spi, " Global Control 0", REG_GC00);
+ micrel_switch_print_reg(spi, " Global Control 1", REG_GC01);
+ micrel_switch_print_reg(spi, " Global Control 2", REG_GC02);
+ micrel_switch_print_reg(spi, " Global Control 3", REG_GC03);
+ micrel_switch_print_reg(spi, " Global Control 4", REG_GC04);
+ micrel_switch_print_reg(spi, " Global Control 5", REG_GC05);
+ micrel_switch_print_reg(spi, " Global Control 6", REG_GC06);
+ micrel_switch_print_reg(spi, " Global Control 7", REG_GC07);
+ micrel_switch_print_reg(spi, " Global Control 8", REG_GC08);
+ micrel_switch_print_reg(spi, " Global Control 9", REG_GC09);
+ micrel_switch_print_reg(spi, " Global Control 10", REG_GC10);
+ micrel_switch_print_reg(spi, " Global Control 11", REG_GC11);
+ micrel_switch_print_reg(spi, " Port 1 Status 1", REG_PSTAT1(1));
+ micrel_switch_print_reg(spi, " Port 1 Status 2", REG_PSTAT2(1));
+ micrel_switch_print_reg(spi, " Port 2 Status 1", REG_PSTAT1(2));
+ micrel_switch_print_reg(spi, " Port 2 Status 2", REG_PSTAT2(2));
+}
+
+static ssize_t micel_switch_read(struct cdev *cdev, void *_buf, size_t count, loff_t offset, ulong flags)
+{
+ int i, ret;
+ uint8_t *buf = _buf;
+ struct micrel_switch_priv *priv = cdev->priv;
+
+ for (i = 0; i < count; i++) {
+ ret = micrel_switch_read_reg(priv->spi, offset);
+ if (ret < 0)
+ return ret;
+ *buf = ret;
+ buf++;
+ offset++;
+ }
+
+ return count;
+}
+
+static ssize_t micel_switch_write(struct cdev *cdev, const void *_buf, size_t count, loff_t offset, ulong flags)
+{
+ int i;
+ const uint8_t *buf = _buf;
+ struct micrel_switch_priv *priv = cdev->priv;
+
+ for (i = 0; i < count; i++) {
+ micrel_switch_write_reg(priv->spi, offset, *buf);
+ buf++;
+ offset++;
+ }
+
+ return count;
+}
+
+static struct file_operations micrel_switch_ops = {
+ .read = micel_switch_read,
+ .write = micel_switch_write,
+ .lseek = dev_lseek_default,
+};
+
+static int micrel_switch_probe(struct device_d *dev)
+{
+ struct micrel_switch_priv *priv;
+ int ret = 0;
+
+ priv = xzalloc(sizeof(*priv));
+
+ dev->priv = priv;
+
+ priv->spi = (struct spi_device *)dev->type_data;
+ priv->spi->mode = SPI_MODE_0;
+ priv->spi->bits_per_word = 8;
+
+ ret = micrel_switch_read_reg(priv->spi, REG_ID0);
+ if (ret < 0) {
+ dev_err(&priv->spi->dev, "failed to read device id\n");
+ return ret;
+ }
+ if (ret != 0x95) {
+ dev_err(&priv->spi->dev, "unknown device id: %02x\n", ret);
+ return -ENODEV;
+ }
+
+ priv->cdev.name = asprintf("switch%d", dev->id);
+ priv->cdev.size = 256;
+ priv->cdev.ops = &micrel_switch_ops;
+ priv->cdev.priv = priv;
+ priv->cdev.dev = dev;
+ devfs_create(&priv->cdev);
+
+ dev_add_param(dev, "enable", micrel_switch_enable_set, NULL, 0);
+ dev_set_param(dev, "enable", "1");
+
+ return 0;
+}
+
+static struct driver_d micrel_switch_driver = {
+ .name = "ksz8864rmn",
+ .probe = micrel_switch_probe,
+ .info = micrel_switch_info,
+};
+
+static int micrel_switch_init(void)
+{
+ register_driver(&micrel_switch_driver);
+ return 0;
+}
+device_initcall(micrel_switch_init);
--
1.7.10.4
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