phy: Micrel KS8995MA 5-ports 10/100 managed Ethernet switch support added

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Frederic Lambert <frdrc66@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 375 insertions, 0 deletions

diff --git a/drivers/net/phy/spi_ks8995.c b/drivers/net/phy/spi_ks8995.c
new file mode 100644
index 00000000000..116a2dd7c87
--- /dev/null
+++ b/drivers/net/phy/spi_ks8995.c
@@ -0,0 +1,375 @@
+/*
+ * SPI driver for Micrel/Kendin KS8995M ethernet switch
+ *
+ * Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.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 version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#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		"0.1.1"
+#define DRV_DESC		"Micrel KS8995 Ethernet switch SPI 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 inline int ks8995_read_reg(struct ks8995_switch *ks, u8 addr, u8 *buf)
+{
+	return (ks8995_read(ks, buf, addr, 1) != 1);
+}
+
+static inline int ks8995_write_reg(struct ks8995_switch *ks, u8 addr, u8 val)
+{
+	char buf = val;
+
+	return (ks8995_write(ks, &buf, addr, 1) != 1);
+}
+
+/* ------------------------------------------------------------------------ */
+
+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 ssize_t ks8995_registers_read(struct file *filp, 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 ssize_t ks8995_registers_write(struct file *filp, 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_VERSION(DRV_VERSION);
+MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
+MODULE_LICENSE("GPL v2");