drivers/net/phy/spi_ks8995.c - kernel/bruno - Git at Google

 /*
  * SPI driver for Micrel/Kendin KS8995M and KSZ8864RMN ethernet switches
  *
  * 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.
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include <linux/types.h>
 #include <linux/kernel.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 KSZ8864_REG_ID1		0xfe	/* Chip ID in bit 7 */

 #define KS8995_REGS_SIZE	0x80
 #define KSZ8864_REGS_SIZE	0x100

 #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;
 	struct bin_attribute	regs_attr;
 };

 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);

 	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);

 	return ks8995_write(ks8995, buf, off, count);
 }

 static const 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 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 = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
 	if (!ks)
 		return -ENOMEM;

 	mutex_init(&ks->lock);
 	ks->pdata = pdata;
 	ks->spi = spi_dev_get(spi);
 	spi_set_drvdata(spi, 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);
 		return err;
 	}

 	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);
 		return err;
 	}

 	switch (ids[0]) {
 	case FAMILY_KS8995:
 		break;
 	default:
 		dev_err(&spi->dev, "unknown family id:%02x\n", ids[0]);
 		return -ENODEV;
 	}

 	memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
 	if (get_chip_id(ids[1]) != CHIPID_M) {
 		u8 val;

 		/* Check if this is a KSZ8864RMN */
 		err = ks8995_read(ks, &val, KSZ8864_REG_ID1, sizeof(val));
 		if (err < 0) {
 			dev_err(&spi->dev,
 				"unable to read chip id register, err=%d\n",
 				err);
 			return err;
 		}
 		if ((val & 0x80) == 0) {
 			dev_err(&spi->dev, "unknown chip:%02x,0\n", ids[1]);
 			return err;
 		}
 		ks->regs_attr.size = KSZ8864_REGS_SIZE;
 	}

 	err = ks8995_reset(ks);
 	if (err)
 		return err;

 	err = sysfs_create_bin_file(&spi->dev.kobj, &ks->regs_attr);
 	if (err) {
 		dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",
 				    err);
 		return err;
 	}

 	if (get_chip_id(ids[1]) == CHIPID_M) {
 		dev_info(&spi->dev,
 			 "KS8995 device found, Chip ID:%x, Revision:%x\n",
 			 get_chip_id(ids[1]), get_chip_rev(ids[1]));
 	} else {
 		dev_info(&spi->dev, "KSZ8864 device found, Revision:%x\n",
 			 get_chip_rev(ids[1]));
 	}

 	return 0;
 }

 static int ks8995_remove(struct spi_device *spi)
 {
 	struct ks8995_switch *ks = spi_get_drvdata(spi);

 	sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);

 	return 0;
 }

 /* ------------------------------------------------------------------------ */

 static struct spi_driver ks8995_driver = {
 	.driver = {
 		.name	    = "spi-ks8995",
 	},
 	.probe	  = ks8995_probe,
 	.remove	  = ks8995_remove,
 };

 module_spi_driver(ks8995_driver);

 MODULE_DESCRIPTION(DRV_DESC);
 MODULE_VERSION(DRV_VERSION);
 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
 MODULE_LICENSE("GPL v2");
	/*
	* SPI driver for Micrel/Kendin KS8995M and KSZ8864RMN ethernet switches
	*
	* 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.
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/types.h>
	#include <linux/kernel.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 KSZ8864_REG_ID1 0xfe /* Chip ID in bit 7 */

	#define KS8995_REGS_SIZE 0x80
	#define KSZ8864_REGS_SIZE 0x100

	#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;
	struct bin_attribute regs_attr;
	};

	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);

	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);

	return ks8995_write(ks8995, buf, off, count);
	}

	static const 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 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 = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
	if (!ks)
	return -ENOMEM;

	mutex_init(&ks->lock);
	ks->pdata = pdata;
	ks->spi = spi_dev_get(spi);
	spi_set_drvdata(spi, 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);
	return err;
	}

	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);
	return err;
	}

	switch (ids[0]) {
	case FAMILY_KS8995:
	break;
	default:
	dev_err(&spi->dev, "unknown family id:%02x\n", ids[0]);
	return -ENODEV;
	}

	memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
	if (get_chip_id(ids[1]) != CHIPID_M) {
	u8 val;

	/* Check if this is a KSZ8864RMN */
	err = ks8995_read(ks, &val, KSZ8864_REG_ID1, sizeof(val));
	if (err < 0) {
	dev_err(&spi->dev,
	"unable to read chip id register, err=%d\n",
	err);
	return err;
	}
	if ((val & 0x80) == 0) {
	dev_err(&spi->dev, "unknown chip:%02x,0\n", ids[1]);
	return err;
	}
	ks->regs_attr.size = KSZ8864_REGS_SIZE;
	}

	err = ks8995_reset(ks);
	if (err)
	return err;

	err = sysfs_create_bin_file(&spi->dev.kobj, &ks->regs_attr);
	if (err) {
	dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",
	err);
	return err;
	}

	if (get_chip_id(ids[1]) == CHIPID_M) {
	dev_info(&spi->dev,
	"KS8995 device found, Chip ID:%x, Revision:%x\n",
	get_chip_id(ids[1]), get_chip_rev(ids[1]));
	} else {
	dev_info(&spi->dev, "KSZ8864 device found, Revision:%x\n",
	get_chip_rev(ids[1]));
	}

	return 0;
	}

	static int ks8995_remove(struct spi_device *spi)
	{
	struct ks8995_switch *ks = spi_get_drvdata(spi);

	sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);

	return 0;
	}

	/* ------------------------------------------------------------------------ */

	static struct spi_driver ks8995_driver = {
	.driver = {
	.name = "spi-ks8995",
	},
	.probe = ks8995_probe,
	.remove = ks8995_remove,
	};

	module_spi_driver(ks8995_driver);

	MODULE_DESCRIPTION(DRV_DESC);
	MODULE_VERSION(DRV_VERSION);
	MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
	MODULE_LICENSE("GPL v2");