add a driver for the KS8995 ethernet switch, will be usable to control the switch on some boards

SVN-Revision: 10851

3 files changed, 423 insertions, 0 deletions

diff --git a/package/spi-ks8995/src/Kconfig b/package/spi-ks8995/src/Kconfig
new file mode 100644
index 0000000000..7859be183d
--- /dev/null
+++ b/package/spi-ks8995/src/Kconfig
@@ -0,0 +1,3 @@
+config SPI_KS8995
+	tristate "Micrel/Kendin KS8995 Ethernet switch"
+	depends on SPI
diff --git a/package/spi-ks8995/src/Makefile b/package/spi-ks8995/src/Makefile
new file mode 100644
index 0000000000..810c3bd1db
--- /dev/null
+++ b/package/spi-ks8995/src/Makefile
@@ -0,0 +1 @@
+obj-${CONFIG_SPI_KS8995}	+= spi_ks8995.o
\ No newline at end of file
diff --git a/package/spi-ks8995/src/spi_ks8995.c b/package/spi-ks8995/src/spi_ks8995.c
new file mode 100644
index 0000000000..d90efb21e8
--- /dev/null
+++ b/package/spi-ks8995/src/spi_ks8995.c
@@ -0,0 +1,419 @@
+/*
+ * SPI driver for Micrel/Kendin KS8995M ethernet switch
+ *
+ * Copyright (C) 2008 Gabor Juhos <juhosg at opwnert.org>
+ *
+ * This file was based on: drivers/spi/at25.c
+ *	Copyright (C) 2006 David Brownell
+ *
+ * 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.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+
+#include <linux/spi/spi.h>
+
+#define DRV_VERSION	"0.1.0"
+#define DRV_DESC	"Micrel/Kendin KS8995 Ethernet switch driver"
+
+/*-------------------------------------------------------------------------*/
+
+#define KS8995_REG_ID0		0x00	/* Chip ID0 */
+#define KS8995_REG_ID1		0x01	/* Chip ID1 */
+
+#define KS8995_REG_GC0		0x02	/* Global Control 0 */
+#define KS8995_REG_GC1		0x03	/* Global Control 1 */
+#define KS8995_REG_GC2		0x04	/* Global Control 2 */
+#define KS8995_REG_GC3		0x05	/* Global Control 3 */
+#define KS8995_REG_GC4		0x06	/* Global Control 4 */
+#define KS8995_REG_GC5		0x07	/* Global Control 5 */
+#define KS8995_REG_GC6		0x08	/* Global Control 6 */
+#define KS8995_REG_GC7		0x09	/* Global Control 7 */
+#define KS8995_REG_GC8		0x0a	/* Global Control 8 */
+#define KS8995_REG_GC9		0x0b	/* Global Control 9 */
+
+#define KS8995_REG_PC(p,r)	((0x10 * p) + r)	/* Port Control */
+#define KS8995_REG_PS(p,r)	((0x10 * p) + r + 0xe)	/* Port Status */
+
+#define KS8995_REG_TPC0		0x60	/* TOS Priority Control 0 */
+#define KS8995_REG_TPC1		0x61	/* TOS Priority Control 1 */
+#define KS8995_REG_TPC2		0x62	/* TOS Priority Control 2 */
+#define KS8995_REG_TPC3		0x63	/* TOS Priority Control 3 */
+#define KS8995_REG_TPC4		0x64	/* TOS Priority Control 4 */
+#define KS8995_REG_TPC5		0x65	/* TOS Priority Control 5 */
+#define KS8995_REG_TPC6		0x66	/* TOS Priority Control 6 */
+#define KS8995_REG_TPC7		0x67	/* TOS Priority Control 7 */
+
+#define KS8995_REG_MAC0		0x68	/* MAC address 0 */
+#define KS8995_REG_MAC1		0x69	/* MAC address 1 */
+#define KS8995_REG_MAC2		0x6a	/* MAC address 2 */
+#define KS8995_REG_MAC3		0x6b	/* MAC address 3 */
+#define KS8995_REG_MAC4		0x6c	/* MAC address 4 */
+#define KS8995_REG_MAC5		0x6d	/* MAC address 5 */
+
+#define KS8995_REG_IAC0		0x6e	/* Indirect Access Control 0 */
+#define KS8995_REG_IAC1		0x6f	/* Indirect Access Control 0 */
+
+#define KS8995_REG_IAD7		0x70	/* Indirect Access Data 7 */
+#define KS8995_REG_IAD6		0x71	/* Indirect Access Data 6 */
+#define KS8995_REG_IAD5		0x72	/* Indirect Access Data 5 */
+#define KS8995_REG_IAD4		0x73	/* Indirect Access Data 4 */
+#define KS8995_REG_IAD3		0x74	/* Indirect Access Data 3 */
+#define KS8995_REG_IAD2		0x75	/* Indirect Access Data 2 */
+#define KS8995_REG_IAD1		0x76	/* Indirect Access Data 1 */
+#define KS8995_REG_IAD0		0x77	/* Indirect Access Data 0 */
+
+#define KS8995_REGS_SIZE	0x80
+
+#define ID1_CHIPID_M	0xf
+#define ID1_CHIPID_S	4
+#define ID1_REVISION_M	0x7
+#define ID1_REVISION_S	1
+#define ID1_START_SW	1	/* start the switch */
+
+#define FAMILY_KS8995	0x95
+#define CHIPID_M	0
+
+#define KS8995_CMD_WRITE	0x02U
+#define KS8995_CMD_READ		0x03U
+
+#define KS8995_RESET_DELAY	10 /* usec */
+
+/*-------------------------------------------------------------------------*/
+
+struct ks8995_pdata {
+	/* not yet implemented */
+};
+
+struct ks8995_switch {
+	struct spi_device	*spi;
+	struct mutex		lock;
+	struct ks8995_pdata	*pdata;
+};
+
+/*-------------------------------------------------------------------------*/
+
+static inline u8 get_chip_id(u8 val)
+{
+	return ((val >> ID1_CHIPID_S) & ID1_CHIPID_M);
+}
+
+static inline u8 get_chip_rev(u8 val)
+{
+	return ((val >> ID1_REVISION_S) & ID1_REVISION_M);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int ks8995_read(struct ks8995_switch *ks, char *buf,
+		unsigned offset, size_t count)
+{
+	u8 cmd[2];
+	struct spi_transfer t[2];
+	struct spi_message m;
+	int err;
+
+	spi_message_init(&m);
+
+	memset(&t, 0, sizeof(t));
+
+	t[0].tx_buf = cmd;
+	t[0].len = sizeof(cmd);
+	spi_message_add_tail(&t[0], &m);
+
+	t[1].rx_buf = buf;
+	t[1].len = count;
+	spi_message_add_tail(&t[1], &m);
+
+	cmd[0] = KS8995_CMD_READ;
+	cmd[1] = offset;
+
+	mutex_lock(&ks->lock);
+	err = spi_sync(ks->spi, &m);
+	mutex_unlock(&ks->lock);
+
+	return err ? err : count;
+}
+
+
+static int ks8995_write(struct ks8995_switch *ks, char *buf,
+		unsigned offset, size_t count)
+{
+	u8 cmd[2];
+	struct spi_transfer t[2];
+	struct spi_message m;
+	int err;
+
+	spi_message_init(&m);
+
+	memset(&t, 0, sizeof(t));
+
+	t[0].tx_buf = cmd;
+	t[0].len = sizeof(cmd);
+	spi_message_add_tail(&t[0], &m);
+
+	t[1].tx_buf = buf;
+	t[1].len = count;
+	spi_message_add_tail(&t[1], &m);
+
+	cmd[0] = KS8995_CMD_WRITE;
+	cmd[1] = offset;
+
+	mutex_lock(&ks->lock);
+	err = spi_sync(ks->spi, &m);
+	mutex_unlock(&ks->lock);
+
+	return err ? err : count;
+}
+
+static int ks8995_read_reg(struct ks8995_switch *ks, u8 addr, u8 *buf)
+{
+	return (ks8995_read(ks, buf, addr, 1) != 1);
+}
+
+static int ks8995_write_reg(struct ks8995_switch *ks, u8 addr, u8 val)
+{
+	char buf = val;
+
+	return (ks8995_write(ks, &buf, addr, 1) != 1);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#if 0
+static int ks8995_setup(struct spi_device *spi)
+{
+	struct ks8995_switch *ks;
+	u8 t;
+
+	ks = dev_get_drvdata(&spi->dev);
+
+	ks8995_write_reg(ks, KS8995_REG_GC0, 0x4c);
+	ks8995_write_reg(ks, KS8995_REG_GC1, 0x05);
+
+	ks8995_read_reg(ks, KS8995_REG_GC2, &t);
+	ks8995_write_reg(ks, KS8995_REG_GC2, t | 1);
+
+	ks8995_write_reg(ks, KS8995_REG_GC4, 0x20);
+
+	ks8995_write_reg(ks, KS8995_REG_PC(1,0), 0x61);
+	ks8995_write_reg(ks, KS8995_REG_PC(2,0), 0x61);
+	ks8995_write_reg(ks, KS8995_REG_PC(3,0), 0x61);
+	ks8995_write_reg(ks, KS8995_REG_PC(4,0), 0x61);
+	ks8995_write_reg(ks, KS8995_REG_PC(5,0), 0x61);
+
+	ks8995_write_reg(ks, KS8995_REG_PC(5,11), 0x18);
+
+	ks8995_write_reg(ks, KS8995_REG_TPC0, 0xff);
+	ks8995_write_reg(ks, KS8995_REG_TPC1, 0xff);
+	ks8995_write_reg(ks, KS8995_REG_TPC2, 0xff);
+	ks8995_write_reg(ks, KS8995_REG_TPC3, 0xff);
+	ks8995_write_reg(ks, KS8995_REG_TPC4, 0xff);
+	ks8995_write_reg(ks, KS8995_REG_TPC5, 0xff);
+	ks8995_write_reg(ks, KS8995_REG_TPC6, 0xff);
+	ks8995_write_reg(ks, KS8995_REG_TPC7, 0xfe);
+
+	return 0;
+}
+#endif
+
+static int ks8995_stop(struct ks8995_switch *ks)
+{
+	return ks8995_write_reg(ks, KS8995_REG_ID1, 0);
+}
+
+static int ks8995_start(struct ks8995_switch *ks)
+{
+	return ks8995_write_reg(ks, KS8995_REG_ID1, 1);
+}
+
+static int ks8995_reset(struct ks8995_switch *ks)
+{
+	int err;
+
+	err = ks8995_stop(ks);
+	if (err)
+		return err;
+
+	udelay(KS8995_RESET_DELAY);
+
+	return ks8995_start(ks);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int ks8995_registers_read(struct kobject *kobj,
+	struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
+{
+	struct device *dev;
+	struct ks8995_switch *ks8995;
+
+	dev = container_of(kobj, struct device, kobj);
+	ks8995 = dev_get_drvdata(dev);
+
+	if (unlikely(off > KS8995_REGS_SIZE))
+		return 0;
+
+	if ((off + count) > KS8995_REGS_SIZE)
+		count = KS8995_REGS_SIZE - off;
+
+	if (unlikely(!count))
+		return count;
+
+	return ks8995_read(ks8995, buf, off, count);
+}
+
+
+static int ks8995_registers_write(struct kobject *kobj,
+	struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
+{
+	struct device *dev;
+	struct ks8995_switch *ks8995;
+
+	dev = container_of(kobj, struct device, kobj);
+	ks8995 = dev_get_drvdata(dev);
+
+	if (unlikely(off >= KS8995_REGS_SIZE))
+		return -EFBIG;
+
+	if ((off + count) > KS8995_REGS_SIZE)
+		count = KS8995_REGS_SIZE - off;
+
+	if (unlikely(!count))
+		return count;
+
+	return ks8995_write(ks8995, buf, off, count);
+}
+
+
+static struct bin_attribute ks8995_registers_attr = {
+	.attr = {
+		.name	= "registers",
+		.mode	= S_IRUSR | S_IWUSR,
+	},
+	.size	= KS8995_REGS_SIZE,
+	.read	= ks8995_registers_read,
+	.write	= ks8995_registers_write,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int __devinit ks8995_probe(struct spi_device *spi)
+{
+	struct ks8995_switch	*ks;
+	struct ks8995_pdata	*pdata;
+	u8	ids[2];
+	int	err;
+
+	/* Chip description */
+	pdata = spi->dev.platform_data;
+
+	ks = kzalloc(sizeof(*ks), GFP_KERNEL);
+	if (!ks) {
+		dev_err(&spi->dev, "no memory for private data\n");
+		return-ENOMEM;
+	}
+
+	mutex_init(&ks->lock);
+	ks->pdata = pdata;
+	ks->spi = spi_dev_get(spi);
+	dev_set_drvdata(&spi->dev, ks);
+
+	spi->mode = SPI_MODE_0;
+	spi->bits_per_word = 8;
+	err = spi_setup(spi);
+	if (err) {
+		dev_err(&spi->dev, "spi_setup failed, err=%d \n", err);
+		goto err_drvdata;
+	}
+
+	err = ks8995_read(ks, ids, KS8995_REG_ID0, sizeof(ids));
+	if (err < 0) {
+		dev_err(&spi->dev, "unable to read id registers, err=%d \n",
+				err);
+		goto err_drvdata;
+	}
+
+	switch (ids[0]) {
+	case FAMILY_KS8995:
+		break;
+	default:
+		dev_err(&spi->dev, "unknown family id:%02x\n", ids[0]);
+		err = -ENODEV;
+		goto err_drvdata;
+	}
+
+	err = ks8995_reset(ks);
+	if (err)
+		goto err_drvdata;
+
+	err = sysfs_create_bin_file(&spi->dev.kobj, &ks8995_registers_attr);
+	if (err) {
+		dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",
+					err);
+		goto err_drvdata;
+	}
+
+	dev_info(&spi->dev, "KS89%02X device found, Chip ID:%01x, "
+			"Revision:%01x\n", ids[0],
+			get_chip_id(ids[1]), get_chip_rev(ids[1]));
+
+	return 0;
+
+err_drvdata:
+	dev_set_drvdata(&spi->dev, NULL);
+	kfree(ks);
+	return err;
+}
+
+static int __devexit ks8995_remove(struct spi_device *spi)
+{
+	struct ks8995_data	*ks8995;
+
+	ks8995 = dev_get_drvdata(&spi->dev);
+	sysfs_remove_bin_file(&spi->dev.kobj, &ks8995_registers_attr);
+
+	dev_set_drvdata(&spi->dev, NULL);
+	kfree(ks8995);
+
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static struct spi_driver ks8995_driver = {
+	.driver = {
+		.name		= "spi-ks8995",
+		.bus		= &spi_bus_type,
+		.owner		= THIS_MODULE,
+	},
+	.probe		= ks8995_probe,
+	.remove		= __devexit_p(ks8995_remove),
+};
+
+static int __init ks8995_init(void)
+{
+	printk(KERN_INFO DRV_DESC " version " DRV_VERSION"\n");
+
+	return spi_register_driver(&ks8995_driver);
+}
+module_init(ks8995_init);
+
+static void __exit ks8995_exit(void)
+{
+	spi_unregister_driver(&ks8995_driver);
+}
+module_exit(ks8995_exit);
+
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
+MODULE_LICENSE("GPL v2");
+