+++ /dev/null
-/*
- * 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/Kendin 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);
-}
-
-/*-------------------------------------------------------------------------*/
-
-#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 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 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 = 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");
-
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