2 * SPI driver for Micrel/Kendin KS8995M and KSZ8864RMN ethernet switches
4 * Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.org>
6 * This file was based on: drivers/spi/at25.c
7 * Copyright (C) 2006 David Brownell
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/delay.h>
20 #include <linux/device.h>
22 #include <linux/spi/spi.h>
24 #define DRV_VERSION "0.1.1"
25 #define DRV_DESC "Micrel KS8995 Ethernet switch SPI driver"
27 /* ------------------------------------------------------------------------ */
29 #define KS8995_REG_ID0 0x00 /* Chip ID0 */
30 #define KS8995_REG_ID1 0x01 /* Chip ID1 */
32 #define KS8995_REG_GC0 0x02 /* Global Control 0 */
33 #define KS8995_REG_GC1 0x03 /* Global Control 1 */
34 #define KS8995_REG_GC2 0x04 /* Global Control 2 */
35 #define KS8995_REG_GC3 0x05 /* Global Control 3 */
36 #define KS8995_REG_GC4 0x06 /* Global Control 4 */
37 #define KS8995_REG_GC5 0x07 /* Global Control 5 */
38 #define KS8995_REG_GC6 0x08 /* Global Control 6 */
39 #define KS8995_REG_GC7 0x09 /* Global Control 7 */
40 #define KS8995_REG_GC8 0x0a /* Global Control 8 */
41 #define KS8995_REG_GC9 0x0b /* Global Control 9 */
43 #define KS8995_REG_PC(p, r) ((0x10 * p) + r) /* Port Control */
44 #define KS8995_REG_PS(p, r) ((0x10 * p) + r + 0xe) /* Port Status */
46 #define KS8995_REG_TPC0 0x60 /* TOS Priority Control 0 */
47 #define KS8995_REG_TPC1 0x61 /* TOS Priority Control 1 */
48 #define KS8995_REG_TPC2 0x62 /* TOS Priority Control 2 */
49 #define KS8995_REG_TPC3 0x63 /* TOS Priority Control 3 */
50 #define KS8995_REG_TPC4 0x64 /* TOS Priority Control 4 */
51 #define KS8995_REG_TPC5 0x65 /* TOS Priority Control 5 */
52 #define KS8995_REG_TPC6 0x66 /* TOS Priority Control 6 */
53 #define KS8995_REG_TPC7 0x67 /* TOS Priority Control 7 */
55 #define KS8995_REG_MAC0 0x68 /* MAC address 0 */
56 #define KS8995_REG_MAC1 0x69 /* MAC address 1 */
57 #define KS8995_REG_MAC2 0x6a /* MAC address 2 */
58 #define KS8995_REG_MAC3 0x6b /* MAC address 3 */
59 #define KS8995_REG_MAC4 0x6c /* MAC address 4 */
60 #define KS8995_REG_MAC5 0x6d /* MAC address 5 */
62 #define KS8995_REG_IAC0 0x6e /* Indirect Access Control 0 */
63 #define KS8995_REG_IAC1 0x6f /* Indirect Access Control 0 */
64 #define KS8995_REG_IAD7 0x70 /* Indirect Access Data 7 */
65 #define KS8995_REG_IAD6 0x71 /* Indirect Access Data 6 */
66 #define KS8995_REG_IAD5 0x72 /* Indirect Access Data 5 */
67 #define KS8995_REG_IAD4 0x73 /* Indirect Access Data 4 */
68 #define KS8995_REG_IAD3 0x74 /* Indirect Access Data 3 */
69 #define KS8995_REG_IAD2 0x75 /* Indirect Access Data 2 */
70 #define KS8995_REG_IAD1 0x76 /* Indirect Access Data 1 */
71 #define KS8995_REG_IAD0 0x77 /* Indirect Access Data 0 */
73 #define KSZ8864_REG_ID1 0xfe /* Chip ID in bit 7 */
75 #define KS8995_REGS_SIZE 0x80
76 #define KSZ8864_REGS_SIZE 0x100
78 #define ID1_CHIPID_M 0xf
79 #define ID1_CHIPID_S 4
80 #define ID1_REVISION_M 0x7
81 #define ID1_REVISION_S 1
82 #define ID1_START_SW 1 /* start the switch */
84 #define FAMILY_KS8995 0x95
86 #define KS8995_CHIP_ID 0x00
87 #define KSZ8864_CHIP_ID 0x01
89 #define KS8995_CMD_WRITE 0x02U
90 #define KS8995_CMD_READ 0x03U
92 #define KS8995_RESET_DELAY 10 /* usec */
94 enum ks8995_chip_variant {
100 struct ks8995_chip_params {
107 static const struct ks8995_chip_params ks8995_chip[] = {
110 .family_id = FAMILY_KS8995,
111 .chip_id = KS8995_CHIP_ID,
112 .regs_size = KS8995_REGS_SIZE,
115 .name = "KSZ8864RMN",
116 .family_id = FAMILY_KS8995,
117 .chip_id = KSZ8864_CHIP_ID,
118 .regs_size = KSZ8864_REGS_SIZE,
122 struct ks8995_pdata {
123 /* not yet implemented */
126 struct ks8995_switch {
127 struct spi_device *spi;
129 struct ks8995_pdata *pdata;
130 struct bin_attribute regs_attr;
131 const struct ks8995_chip_params *chip;
135 static const struct spi_device_id ks8995_id[] = {
137 {"ksz8864", ksz8864},
140 MODULE_DEVICE_TABLE(spi, ks8995_id);
142 static inline u8 get_chip_id(u8 val)
144 return (val >> ID1_CHIPID_S) & ID1_CHIPID_M;
147 static inline u8 get_chip_rev(u8 val)
149 return (val >> ID1_REVISION_S) & ID1_REVISION_M;
152 /* ------------------------------------------------------------------------ */
153 static int ks8995_read(struct ks8995_switch *ks, char *buf,
154 unsigned offset, size_t count)
157 struct spi_transfer t[2];
158 struct spi_message m;
161 spi_message_init(&m);
163 memset(&t, 0, sizeof(t));
166 t[0].len = sizeof(cmd);
167 spi_message_add_tail(&t[0], &m);
171 spi_message_add_tail(&t[1], &m);
173 cmd[0] = KS8995_CMD_READ;
176 mutex_lock(&ks->lock);
177 err = spi_sync(ks->spi, &m);
178 mutex_unlock(&ks->lock);
180 return err ? err : count;
184 static int ks8995_write(struct ks8995_switch *ks, char *buf,
185 unsigned offset, size_t count)
188 struct spi_transfer t[2];
189 struct spi_message m;
192 spi_message_init(&m);
194 memset(&t, 0, sizeof(t));
197 t[0].len = sizeof(cmd);
198 spi_message_add_tail(&t[0], &m);
202 spi_message_add_tail(&t[1], &m);
204 cmd[0] = KS8995_CMD_WRITE;
207 mutex_lock(&ks->lock);
208 err = spi_sync(ks->spi, &m);
209 mutex_unlock(&ks->lock);
211 return err ? err : count;
214 static inline int ks8995_read_reg(struct ks8995_switch *ks, u8 addr, u8 *buf)
216 return ks8995_read(ks, buf, addr, 1) != 1;
219 static inline int ks8995_write_reg(struct ks8995_switch *ks, u8 addr, u8 val)
223 return ks8995_write(ks, &buf, addr, 1) != 1;
226 /* ------------------------------------------------------------------------ */
228 static int ks8995_stop(struct ks8995_switch *ks)
230 return ks8995_write_reg(ks, KS8995_REG_ID1, 0);
233 static int ks8995_start(struct ks8995_switch *ks)
235 return ks8995_write_reg(ks, KS8995_REG_ID1, 1);
238 static int ks8995_reset(struct ks8995_switch *ks)
242 err = ks8995_stop(ks);
246 udelay(KS8995_RESET_DELAY);
248 return ks8995_start(ks);
251 static ssize_t ks8995_registers_read(struct file *filp, struct kobject *kobj,
252 struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
255 struct ks8995_switch *ks8995;
257 dev = container_of(kobj, struct device, kobj);
258 ks8995 = dev_get_drvdata(dev);
260 return ks8995_read(ks8995, buf, off, count);
263 static ssize_t ks8995_registers_write(struct file *filp, struct kobject *kobj,
264 struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
267 struct ks8995_switch *ks8995;
269 dev = container_of(kobj, struct device, kobj);
270 ks8995 = dev_get_drvdata(dev);
272 return ks8995_write(ks8995, buf, off, count);
275 /* ks8995_get_revision - get chip revision
276 * @ks: pointer to switch instance
278 * Verify chip family and id and get chip revision.
280 static int ks8995_get_revision(struct ks8995_switch *ks)
283 u8 id0, id1, ksz8864_id;
286 err = ks8995_read_reg(ks, KS8995_REG_ID0, &id0);
292 /* verify family id */
293 if (id0 != ks->chip->family_id) {
294 dev_err(&ks->spi->dev, "chip family id mismatch: expected 0x%02x but 0x%02x read\n",
295 ks->chip->family_id, id0);
300 switch (ks->chip->family_id) {
302 /* try reading chip id at CHIP ID1 */
303 err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
310 if ((get_chip_id(id1) == CHIPID_M) &&
311 (get_chip_id(id1) == ks->chip->chip_id)) {
313 ks->revision_id = get_chip_rev(id1);
314 } else if (get_chip_id(id1) != CHIPID_M) {
316 err = ks8995_read_reg(ks, KS8995_REG_ID1, &ksz8864_id);
322 if ((ksz8864_id & 0x80) &&
323 (ks->chip->chip_id == KSZ8864_CHIP_ID)) {
324 ks->revision_id = get_chip_rev(id1);
328 dev_err(&ks->spi->dev, "unsupported chip id for KS8995 family: 0x%02x\n",
334 dev_err(&ks->spi->dev, "unsupported family id: 0x%02x\n", id0);
342 static const struct bin_attribute ks8995_registers_attr = {
345 .mode = S_IRUSR | S_IWUSR,
347 .size = KS8995_REGS_SIZE,
348 .read = ks8995_registers_read,
349 .write = ks8995_registers_write,
352 /* ------------------------------------------------------------------------ */
353 static int ks8995_probe(struct spi_device *spi)
355 struct ks8995_switch *ks;
356 struct ks8995_pdata *pdata;
358 int variant = spi_get_device_id(spi)->driver_data;
360 /* Chip description */
361 pdata = spi->dev.platform_data;
363 if (variant >= max_variant) {
364 dev_err(&spi->dev, "bad chip variant %d\n", variant);
368 ks = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
372 mutex_init(&ks->lock);
374 ks->spi = spi_dev_get(spi);
375 ks->chip = &ks8995_chip[variant];
377 spi_set_drvdata(spi, ks);
379 spi->mode = SPI_MODE_0;
380 spi->bits_per_word = 8;
381 err = spi_setup(spi);
383 dev_err(&spi->dev, "spi_setup failed, err=%d\n", err);
387 err = ks8995_get_revision(ks);
391 ks->regs_attr.size = ks->chip->regs_size;
392 memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
394 err = ks8995_reset(ks);
398 err = sysfs_create_bin_file(&spi->dev.kobj, &ks->regs_attr);
400 dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",
405 dev_info(&spi->dev, "%s device found, Chip ID:%x, Revision:%x\n",
406 ks->chip->name, ks->chip->chip_id, ks->revision_id);
411 static int ks8995_remove(struct spi_device *spi)
413 struct ks8995_switch *ks = spi_get_drvdata(spi);
415 sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);
420 /* ------------------------------------------------------------------------ */
422 static struct spi_driver ks8995_driver = {
424 .name = "spi-ks8995",
426 .probe = ks8995_probe,
427 .remove = ks8995_remove,
428 .id_table = ks8995_id,
431 module_spi_driver(ks8995_driver);
433 MODULE_DESCRIPTION(DRV_DESC);
434 MODULE_VERSION(DRV_VERSION);
435 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
436 MODULE_LICENSE("GPL v2");