1a2443fd1SAndrew Lunn // SPDX-License-Identifier: GPL-2.0
2a8e510f6SFrederic LAMBERT /*
3240a12d5SPhilipp Zabel * SPI driver for Micrel/Kendin KS8995M and KSZ8864RMN ethernet switches
4a8e510f6SFrederic LAMBERT *
5a8e510f6SFrederic LAMBERT * Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.org>
6a8e510f6SFrederic LAMBERT *
7a8e510f6SFrederic LAMBERT * This file was based on: drivers/spi/at25.c
8a8e510f6SFrederic LAMBERT * Copyright (C) 2006 David Brownell
9a8e510f6SFrederic LAMBERT */
10a8e510f6SFrederic LAMBERT
118d242488SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
128d242488SJoe Perches
13a8e510f6SFrederic LAMBERT #include <linux/types.h>
14a8e510f6SFrederic LAMBERT #include <linux/kernel.h>
15a8e510f6SFrederic LAMBERT #include <linux/module.h>
16a8e510f6SFrederic LAMBERT #include <linux/delay.h>
17a8e510f6SFrederic LAMBERT #include <linux/device.h>
1827090cbdSArnd Bergmann #include <linux/gpio/consumer.h>
19cd6f288cSHelmut Buchsbaum #include <linux/of.h>
20a8e510f6SFrederic LAMBERT
21a8e510f6SFrederic LAMBERT #include <linux/spi/spi.h>
22a8e510f6SFrederic LAMBERT
23a8e510f6SFrederic LAMBERT #define DRV_VERSION "0.1.1"
24a8e510f6SFrederic LAMBERT #define DRV_DESC "Micrel KS8995 Ethernet switch SPI driver"
25a8e510f6SFrederic LAMBERT
26a8e510f6SFrederic LAMBERT /* ------------------------------------------------------------------------ */
27a8e510f6SFrederic LAMBERT
28a8e510f6SFrederic LAMBERT #define KS8995_REG_ID0 0x00 /* Chip ID0 */
29a8e510f6SFrederic LAMBERT #define KS8995_REG_ID1 0x01 /* Chip ID1 */
30a8e510f6SFrederic LAMBERT
31a8e510f6SFrederic LAMBERT #define KS8995_REG_GC0 0x02 /* Global Control 0 */
32a8e510f6SFrederic LAMBERT #define KS8995_REG_GC1 0x03 /* Global Control 1 */
33a8e510f6SFrederic LAMBERT #define KS8995_REG_GC2 0x04 /* Global Control 2 */
34a8e510f6SFrederic LAMBERT #define KS8995_REG_GC3 0x05 /* Global Control 3 */
35a8e510f6SFrederic LAMBERT #define KS8995_REG_GC4 0x06 /* Global Control 4 */
36a8e510f6SFrederic LAMBERT #define KS8995_REG_GC5 0x07 /* Global Control 5 */
37a8e510f6SFrederic LAMBERT #define KS8995_REG_GC6 0x08 /* Global Control 6 */
38a8e510f6SFrederic LAMBERT #define KS8995_REG_GC7 0x09 /* Global Control 7 */
39a8e510f6SFrederic LAMBERT #define KS8995_REG_GC8 0x0a /* Global Control 8 */
40a8e510f6SFrederic LAMBERT #define KS8995_REG_GC9 0x0b /* Global Control 9 */
41a8e510f6SFrederic LAMBERT
42a8e510f6SFrederic LAMBERT #define KS8995_REG_PC(p, r) ((0x10 * p) + r) /* Port Control */
43a8e510f6SFrederic LAMBERT #define KS8995_REG_PS(p, r) ((0x10 * p) + r + 0xe) /* Port Status */
44a8e510f6SFrederic LAMBERT
45a8e510f6SFrederic LAMBERT #define KS8995_REG_TPC0 0x60 /* TOS Priority Control 0 */
46a8e510f6SFrederic LAMBERT #define KS8995_REG_TPC1 0x61 /* TOS Priority Control 1 */
47a8e510f6SFrederic LAMBERT #define KS8995_REG_TPC2 0x62 /* TOS Priority Control 2 */
48a8e510f6SFrederic LAMBERT #define KS8995_REG_TPC3 0x63 /* TOS Priority Control 3 */
49a8e510f6SFrederic LAMBERT #define KS8995_REG_TPC4 0x64 /* TOS Priority Control 4 */
50a8e510f6SFrederic LAMBERT #define KS8995_REG_TPC5 0x65 /* TOS Priority Control 5 */
51a8e510f6SFrederic LAMBERT #define KS8995_REG_TPC6 0x66 /* TOS Priority Control 6 */
52a8e510f6SFrederic LAMBERT #define KS8995_REG_TPC7 0x67 /* TOS Priority Control 7 */
53a8e510f6SFrederic LAMBERT
54a8e510f6SFrederic LAMBERT #define KS8995_REG_MAC0 0x68 /* MAC address 0 */
55a8e510f6SFrederic LAMBERT #define KS8995_REG_MAC1 0x69 /* MAC address 1 */
56a8e510f6SFrederic LAMBERT #define KS8995_REG_MAC2 0x6a /* MAC address 2 */
57a8e510f6SFrederic LAMBERT #define KS8995_REG_MAC3 0x6b /* MAC address 3 */
58a8e510f6SFrederic LAMBERT #define KS8995_REG_MAC4 0x6c /* MAC address 4 */
59a8e510f6SFrederic LAMBERT #define KS8995_REG_MAC5 0x6d /* MAC address 5 */
60a8e510f6SFrederic LAMBERT
61a8e510f6SFrederic LAMBERT #define KS8995_REG_IAC0 0x6e /* Indirect Access Control 0 */
62a8e510f6SFrederic LAMBERT #define KS8995_REG_IAC1 0x6f /* Indirect Access Control 0 */
63a8e510f6SFrederic LAMBERT #define KS8995_REG_IAD7 0x70 /* Indirect Access Data 7 */
64a8e510f6SFrederic LAMBERT #define KS8995_REG_IAD6 0x71 /* Indirect Access Data 6 */
65a8e510f6SFrederic LAMBERT #define KS8995_REG_IAD5 0x72 /* Indirect Access Data 5 */
66a8e510f6SFrederic LAMBERT #define KS8995_REG_IAD4 0x73 /* Indirect Access Data 4 */
67a8e510f6SFrederic LAMBERT #define KS8995_REG_IAD3 0x74 /* Indirect Access Data 3 */
68a8e510f6SFrederic LAMBERT #define KS8995_REG_IAD2 0x75 /* Indirect Access Data 2 */
69a8e510f6SFrederic LAMBERT #define KS8995_REG_IAD1 0x76 /* Indirect Access Data 1 */
70a8e510f6SFrederic LAMBERT #define KS8995_REG_IAD0 0x77 /* Indirect Access Data 0 */
71a8e510f6SFrederic LAMBERT
72240a12d5SPhilipp Zabel #define KSZ8864_REG_ID1 0xfe /* Chip ID in bit 7 */
73240a12d5SPhilipp Zabel
74a8e510f6SFrederic LAMBERT #define KS8995_REGS_SIZE 0x80
75240a12d5SPhilipp Zabel #define KSZ8864_REGS_SIZE 0x100
76c0e6cb1fSHelmut Buchsbaum #define KSZ8795_REGS_SIZE 0x100
77a8e510f6SFrederic LAMBERT
78a8e510f6SFrederic LAMBERT #define ID1_CHIPID_M 0xf
79a8e510f6SFrederic LAMBERT #define ID1_CHIPID_S 4
80a8e510f6SFrederic LAMBERT #define ID1_REVISION_M 0x7
81a8e510f6SFrederic LAMBERT #define ID1_REVISION_S 1
82a8e510f6SFrederic LAMBERT #define ID1_START_SW 1 /* start the switch */
83a8e510f6SFrederic LAMBERT
84a8e510f6SFrederic LAMBERT #define FAMILY_KS8995 0x95
85c0e6cb1fSHelmut Buchsbaum #define FAMILY_KSZ8795 0x87
86a8e510f6SFrederic LAMBERT #define CHIPID_M 0
87484e36ffSHelmut Buchsbaum #define KS8995_CHIP_ID 0x00
88484e36ffSHelmut Buchsbaum #define KSZ8864_CHIP_ID 0x01
89c0e6cb1fSHelmut Buchsbaum #define KSZ8795_CHIP_ID 0x09
90a8e510f6SFrederic LAMBERT
91a8e510f6SFrederic LAMBERT #define KS8995_CMD_WRITE 0x02U
92a8e510f6SFrederic LAMBERT #define KS8995_CMD_READ 0x03U
93a8e510f6SFrederic LAMBERT
94a8e510f6SFrederic LAMBERT #define KS8995_RESET_DELAY 10 /* usec */
95a8e510f6SFrederic LAMBERT
96aa54c8daSHelmut Buchsbaum enum ks8995_chip_variant {
97aa54c8daSHelmut Buchsbaum ks8995,
98aa54c8daSHelmut Buchsbaum ksz8864,
99c0e6cb1fSHelmut Buchsbaum ksz8795,
100aa54c8daSHelmut Buchsbaum max_variant
101aa54c8daSHelmut Buchsbaum };
102aa54c8daSHelmut Buchsbaum
103aa54c8daSHelmut Buchsbaum struct ks8995_chip_params {
104aa54c8daSHelmut Buchsbaum char *name;
105484e36ffSHelmut Buchsbaum int family_id;
106484e36ffSHelmut Buchsbaum int chip_id;
107aa54c8daSHelmut Buchsbaum int regs_size;
1086665e623SHelmut Buchsbaum int addr_width;
1096665e623SHelmut Buchsbaum int addr_shift;
110aa54c8daSHelmut Buchsbaum };
111aa54c8daSHelmut Buchsbaum
112aa54c8daSHelmut Buchsbaum static const struct ks8995_chip_params ks8995_chip[] = {
113aa54c8daSHelmut Buchsbaum [ks8995] = {
114aa54c8daSHelmut Buchsbaum .name = "KS8995MA",
115484e36ffSHelmut Buchsbaum .family_id = FAMILY_KS8995,
116484e36ffSHelmut Buchsbaum .chip_id = KS8995_CHIP_ID,
117aa54c8daSHelmut Buchsbaum .regs_size = KS8995_REGS_SIZE,
1186665e623SHelmut Buchsbaum .addr_width = 8,
1196665e623SHelmut Buchsbaum .addr_shift = 0,
120aa54c8daSHelmut Buchsbaum },
121aa54c8daSHelmut Buchsbaum [ksz8864] = {
122aa54c8daSHelmut Buchsbaum .name = "KSZ8864RMN",
123484e36ffSHelmut Buchsbaum .family_id = FAMILY_KS8995,
124484e36ffSHelmut Buchsbaum .chip_id = KSZ8864_CHIP_ID,
125aa54c8daSHelmut Buchsbaum .regs_size = KSZ8864_REGS_SIZE,
1266665e623SHelmut Buchsbaum .addr_width = 8,
1276665e623SHelmut Buchsbaum .addr_shift = 0,
128aa54c8daSHelmut Buchsbaum },
129c0e6cb1fSHelmut Buchsbaum [ksz8795] = {
130c0e6cb1fSHelmut Buchsbaum .name = "KSZ8795CLX",
131c0e6cb1fSHelmut Buchsbaum .family_id = FAMILY_KSZ8795,
132c0e6cb1fSHelmut Buchsbaum .chip_id = KSZ8795_CHIP_ID,
133c0e6cb1fSHelmut Buchsbaum .regs_size = KSZ8795_REGS_SIZE,
134c0e6cb1fSHelmut Buchsbaum .addr_width = 12,
135c0e6cb1fSHelmut Buchsbaum .addr_shift = 1,
136c0e6cb1fSHelmut Buchsbaum },
137aa54c8daSHelmut Buchsbaum };
138aa54c8daSHelmut Buchsbaum
139a8e510f6SFrederic LAMBERT struct ks8995_switch {
140a8e510f6SFrederic LAMBERT struct spi_device *spi;
141a8e510f6SFrederic LAMBERT struct mutex lock;
142006534ecSDmitry Torokhov struct gpio_desc *reset_gpio;
143240a12d5SPhilipp Zabel struct bin_attribute regs_attr;
144aa54c8daSHelmut Buchsbaum const struct ks8995_chip_params *chip;
145484e36ffSHelmut Buchsbaum int revision_id;
146a8e510f6SFrederic LAMBERT };
147a8e510f6SFrederic LAMBERT
148aa54c8daSHelmut Buchsbaum static const struct spi_device_id ks8995_id[] = {
149aa54c8daSHelmut Buchsbaum {"ks8995", ks8995},
150aa54c8daSHelmut Buchsbaum {"ksz8864", ksz8864},
151c0e6cb1fSHelmut Buchsbaum {"ksz8795", ksz8795},
152aa54c8daSHelmut Buchsbaum { }
153aa54c8daSHelmut Buchsbaum };
154aa54c8daSHelmut Buchsbaum MODULE_DEVICE_TABLE(spi, ks8995_id);
155aa54c8daSHelmut Buchsbaum
1562f23a2a7SDaniel Gomez static const struct of_device_id ks8895_spi_of_match[] = {
1572f23a2a7SDaniel Gomez { .compatible = "micrel,ks8995" },
1582f23a2a7SDaniel Gomez { .compatible = "micrel,ksz8864" },
1592f23a2a7SDaniel Gomez { .compatible = "micrel,ksz8795" },
1602f23a2a7SDaniel Gomez { },
1612f23a2a7SDaniel Gomez };
1622f23a2a7SDaniel Gomez MODULE_DEVICE_TABLE(of, ks8895_spi_of_match);
1632f23a2a7SDaniel Gomez
get_chip_id(u8 val)164a8e510f6SFrederic LAMBERT static inline u8 get_chip_id(u8 val)
165a8e510f6SFrederic LAMBERT {
166a8e510f6SFrederic LAMBERT return (val >> ID1_CHIPID_S) & ID1_CHIPID_M;
167a8e510f6SFrederic LAMBERT }
168a8e510f6SFrederic LAMBERT
get_chip_rev(u8 val)169a8e510f6SFrederic LAMBERT static inline u8 get_chip_rev(u8 val)
170a8e510f6SFrederic LAMBERT {
171a8e510f6SFrederic LAMBERT return (val >> ID1_REVISION_S) & ID1_REVISION_M;
172a8e510f6SFrederic LAMBERT }
173a8e510f6SFrederic LAMBERT
1746665e623SHelmut Buchsbaum /* create_spi_cmd - create a chip specific SPI command header
1756665e623SHelmut Buchsbaum * @ks: pointer to switch instance
1766665e623SHelmut Buchsbaum * @cmd: SPI command for switch
1776665e623SHelmut Buchsbaum * @address: register address for command
1786665e623SHelmut Buchsbaum *
1796665e623SHelmut Buchsbaum * Different chip families use different bit pattern to address the switches
1806665e623SHelmut Buchsbaum * registers:
1816665e623SHelmut Buchsbaum *
1826665e623SHelmut Buchsbaum * KS8995: 8bit command + 8bit address
1836665e623SHelmut Buchsbaum * KSZ8795: 3bit command + 12bit address + 1bit TR (?)
1846665e623SHelmut Buchsbaum */
create_spi_cmd(struct ks8995_switch * ks,int cmd,unsigned address)1856665e623SHelmut Buchsbaum static inline __be16 create_spi_cmd(struct ks8995_switch *ks, int cmd,
1866665e623SHelmut Buchsbaum unsigned address)
1876665e623SHelmut Buchsbaum {
1886665e623SHelmut Buchsbaum u16 result = cmd;
1896665e623SHelmut Buchsbaum
1906665e623SHelmut Buchsbaum /* make room for address (incl. address shift) */
1916665e623SHelmut Buchsbaum result <<= ks->chip->addr_width + ks->chip->addr_shift;
1926665e623SHelmut Buchsbaum /* add address */
1936665e623SHelmut Buchsbaum result |= address << ks->chip->addr_shift;
1946665e623SHelmut Buchsbaum /* SPI protocol needs big endian */
1956665e623SHelmut Buchsbaum return cpu_to_be16(result);
1966665e623SHelmut Buchsbaum }
197a8e510f6SFrederic LAMBERT /* ------------------------------------------------------------------------ */
ks8995_read(struct ks8995_switch * ks,char * buf,unsigned offset,size_t count)198a8e510f6SFrederic LAMBERT static int ks8995_read(struct ks8995_switch *ks, char *buf,
199a8e510f6SFrederic LAMBERT unsigned offset, size_t count)
200a8e510f6SFrederic LAMBERT {
2016665e623SHelmut Buchsbaum __be16 cmd;
202a8e510f6SFrederic LAMBERT struct spi_transfer t[2];
203a8e510f6SFrederic LAMBERT struct spi_message m;
204a8e510f6SFrederic LAMBERT int err;
205a8e510f6SFrederic LAMBERT
2066665e623SHelmut Buchsbaum cmd = create_spi_cmd(ks, KS8995_CMD_READ, offset);
207a8e510f6SFrederic LAMBERT spi_message_init(&m);
208a8e510f6SFrederic LAMBERT
209a8e510f6SFrederic LAMBERT memset(&t, 0, sizeof(t));
210a8e510f6SFrederic LAMBERT
2116665e623SHelmut Buchsbaum t[0].tx_buf = &cmd;
212a8e510f6SFrederic LAMBERT t[0].len = sizeof(cmd);
213a8e510f6SFrederic LAMBERT spi_message_add_tail(&t[0], &m);
214a8e510f6SFrederic LAMBERT
215a8e510f6SFrederic LAMBERT t[1].rx_buf = buf;
216a8e510f6SFrederic LAMBERT t[1].len = count;
217a8e510f6SFrederic LAMBERT spi_message_add_tail(&t[1], &m);
218a8e510f6SFrederic LAMBERT
219a8e510f6SFrederic LAMBERT mutex_lock(&ks->lock);
220a8e510f6SFrederic LAMBERT err = spi_sync(ks->spi, &m);
221a8e510f6SFrederic LAMBERT mutex_unlock(&ks->lock);
222a8e510f6SFrederic LAMBERT
223a8e510f6SFrederic LAMBERT return err ? err : count;
224a8e510f6SFrederic LAMBERT }
225a8e510f6SFrederic LAMBERT
ks8995_write(struct ks8995_switch * ks,char * buf,unsigned offset,size_t count)226a8e510f6SFrederic LAMBERT static int ks8995_write(struct ks8995_switch *ks, char *buf,
227a8e510f6SFrederic LAMBERT unsigned offset, size_t count)
228a8e510f6SFrederic LAMBERT {
2296665e623SHelmut Buchsbaum __be16 cmd;
230a8e510f6SFrederic LAMBERT struct spi_transfer t[2];
231a8e510f6SFrederic LAMBERT struct spi_message m;
232a8e510f6SFrederic LAMBERT int err;
233a8e510f6SFrederic LAMBERT
2346665e623SHelmut Buchsbaum cmd = create_spi_cmd(ks, KS8995_CMD_WRITE, offset);
235a8e510f6SFrederic LAMBERT spi_message_init(&m);
236a8e510f6SFrederic LAMBERT
237a8e510f6SFrederic LAMBERT memset(&t, 0, sizeof(t));
238a8e510f6SFrederic LAMBERT
2396665e623SHelmut Buchsbaum t[0].tx_buf = &cmd;
240a8e510f6SFrederic LAMBERT t[0].len = sizeof(cmd);
241a8e510f6SFrederic LAMBERT spi_message_add_tail(&t[0], &m);
242a8e510f6SFrederic LAMBERT
243a8e510f6SFrederic LAMBERT t[1].tx_buf = buf;
244a8e510f6SFrederic LAMBERT t[1].len = count;
245a8e510f6SFrederic LAMBERT spi_message_add_tail(&t[1], &m);
246a8e510f6SFrederic LAMBERT
247a8e510f6SFrederic LAMBERT mutex_lock(&ks->lock);
248a8e510f6SFrederic LAMBERT err = spi_sync(ks->spi, &m);
249a8e510f6SFrederic LAMBERT mutex_unlock(&ks->lock);
250a8e510f6SFrederic LAMBERT
251a8e510f6SFrederic LAMBERT return err ? err : count;
252a8e510f6SFrederic LAMBERT }
253a8e510f6SFrederic LAMBERT
ks8995_read_reg(struct ks8995_switch * ks,u8 addr,u8 * buf)254a8e510f6SFrederic LAMBERT static inline int ks8995_read_reg(struct ks8995_switch *ks, u8 addr, u8 *buf)
255a8e510f6SFrederic LAMBERT {
2567aff9675SFlorian Fainelli return ks8995_read(ks, buf, addr, 1) != 1;
257a8e510f6SFrederic LAMBERT }
258a8e510f6SFrederic LAMBERT
ks8995_write_reg(struct ks8995_switch * ks,u8 addr,u8 val)259a8e510f6SFrederic LAMBERT static inline int ks8995_write_reg(struct ks8995_switch *ks, u8 addr, u8 val)
260a8e510f6SFrederic LAMBERT {
261a8e510f6SFrederic LAMBERT char buf = val;
262a8e510f6SFrederic LAMBERT
2637aff9675SFlorian Fainelli return ks8995_write(ks, &buf, addr, 1) != 1;
264a8e510f6SFrederic LAMBERT }
265a8e510f6SFrederic LAMBERT
266a8e510f6SFrederic LAMBERT /* ------------------------------------------------------------------------ */
267a8e510f6SFrederic LAMBERT
ks8995_stop(struct ks8995_switch * ks)268a8e510f6SFrederic LAMBERT static int ks8995_stop(struct ks8995_switch *ks)
269a8e510f6SFrederic LAMBERT {
270a8e510f6SFrederic LAMBERT return ks8995_write_reg(ks, KS8995_REG_ID1, 0);
271a8e510f6SFrederic LAMBERT }
272a8e510f6SFrederic LAMBERT
ks8995_start(struct ks8995_switch * ks)273a8e510f6SFrederic LAMBERT static int ks8995_start(struct ks8995_switch *ks)
274a8e510f6SFrederic LAMBERT {
275a8e510f6SFrederic LAMBERT return ks8995_write_reg(ks, KS8995_REG_ID1, 1);
276a8e510f6SFrederic LAMBERT }
277a8e510f6SFrederic LAMBERT
ks8995_reset(struct ks8995_switch * ks)278a8e510f6SFrederic LAMBERT static int ks8995_reset(struct ks8995_switch *ks)
279a8e510f6SFrederic LAMBERT {
280a8e510f6SFrederic LAMBERT int err;
281a8e510f6SFrederic LAMBERT
282a8e510f6SFrederic LAMBERT err = ks8995_stop(ks);
283a8e510f6SFrederic LAMBERT if (err)
284a8e510f6SFrederic LAMBERT return err;
285a8e510f6SFrederic LAMBERT
286a8e510f6SFrederic LAMBERT udelay(KS8995_RESET_DELAY);
287a8e510f6SFrederic LAMBERT
288a8e510f6SFrederic LAMBERT return ks8995_start(ks);
289a8e510f6SFrederic LAMBERT }
290a8e510f6SFrederic LAMBERT
ks8995_registers_read(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)291a8e510f6SFrederic LAMBERT static ssize_t ks8995_registers_read(struct file *filp, struct kobject *kobj,
292a8e510f6SFrederic LAMBERT struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
293a8e510f6SFrederic LAMBERT {
294a8e510f6SFrederic LAMBERT struct device *dev;
295a8e510f6SFrederic LAMBERT struct ks8995_switch *ks8995;
296a8e510f6SFrederic LAMBERT
297414698f6SWang Qing dev = kobj_to_dev(kobj);
298a8e510f6SFrederic LAMBERT ks8995 = dev_get_drvdata(dev);
299a8e510f6SFrederic LAMBERT
300a8e510f6SFrederic LAMBERT return ks8995_read(ks8995, buf, off, count);
301a8e510f6SFrederic LAMBERT }
302a8e510f6SFrederic LAMBERT
ks8995_registers_write(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)303a8e510f6SFrederic LAMBERT static ssize_t ks8995_registers_write(struct file *filp, struct kobject *kobj,
304a8e510f6SFrederic LAMBERT struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
305a8e510f6SFrederic LAMBERT {
306a8e510f6SFrederic LAMBERT struct device *dev;
307a8e510f6SFrederic LAMBERT struct ks8995_switch *ks8995;
308a8e510f6SFrederic LAMBERT
309414698f6SWang Qing dev = kobj_to_dev(kobj);
310a8e510f6SFrederic LAMBERT ks8995 = dev_get_drvdata(dev);
311a8e510f6SFrederic LAMBERT
312a8e510f6SFrederic LAMBERT return ks8995_write(ks8995, buf, off, count);
313a8e510f6SFrederic LAMBERT }
314a8e510f6SFrederic LAMBERT
315484e36ffSHelmut Buchsbaum /* ks8995_get_revision - get chip revision
316484e36ffSHelmut Buchsbaum * @ks: pointer to switch instance
317484e36ffSHelmut Buchsbaum *
318484e36ffSHelmut Buchsbaum * Verify chip family and id and get chip revision.
319484e36ffSHelmut Buchsbaum */
ks8995_get_revision(struct ks8995_switch * ks)320484e36ffSHelmut Buchsbaum static int ks8995_get_revision(struct ks8995_switch *ks)
321484e36ffSHelmut Buchsbaum {
322484e36ffSHelmut Buchsbaum int err;
323484e36ffSHelmut Buchsbaum u8 id0, id1, ksz8864_id;
324484e36ffSHelmut Buchsbaum
325484e36ffSHelmut Buchsbaum /* read family id */
326484e36ffSHelmut Buchsbaum err = ks8995_read_reg(ks, KS8995_REG_ID0, &id0);
327484e36ffSHelmut Buchsbaum if (err) {
328484e36ffSHelmut Buchsbaum err = -EIO;
329484e36ffSHelmut Buchsbaum goto err_out;
330484e36ffSHelmut Buchsbaum }
331484e36ffSHelmut Buchsbaum
332484e36ffSHelmut Buchsbaum /* verify family id */
333484e36ffSHelmut Buchsbaum if (id0 != ks->chip->family_id) {
334484e36ffSHelmut Buchsbaum dev_err(&ks->spi->dev, "chip family id mismatch: expected 0x%02x but 0x%02x read\n",
335484e36ffSHelmut Buchsbaum ks->chip->family_id, id0);
336484e36ffSHelmut Buchsbaum err = -ENODEV;
337484e36ffSHelmut Buchsbaum goto err_out;
338484e36ffSHelmut Buchsbaum }
339484e36ffSHelmut Buchsbaum
340484e36ffSHelmut Buchsbaum switch (ks->chip->family_id) {
341484e36ffSHelmut Buchsbaum case FAMILY_KS8995:
342484e36ffSHelmut Buchsbaum /* try reading chip id at CHIP ID1 */
343484e36ffSHelmut Buchsbaum err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
344484e36ffSHelmut Buchsbaum if (err) {
345484e36ffSHelmut Buchsbaum err = -EIO;
346484e36ffSHelmut Buchsbaum goto err_out;
347484e36ffSHelmut Buchsbaum }
348484e36ffSHelmut Buchsbaum
349484e36ffSHelmut Buchsbaum /* verify chip id */
350484e36ffSHelmut Buchsbaum if ((get_chip_id(id1) == CHIPID_M) &&
351484e36ffSHelmut Buchsbaum (get_chip_id(id1) == ks->chip->chip_id)) {
352484e36ffSHelmut Buchsbaum /* KS8995MA */
353484e36ffSHelmut Buchsbaum ks->revision_id = get_chip_rev(id1);
354484e36ffSHelmut Buchsbaum } else if (get_chip_id(id1) != CHIPID_M) {
355484e36ffSHelmut Buchsbaum /* KSZ8864RMN */
356484e36ffSHelmut Buchsbaum err = ks8995_read_reg(ks, KS8995_REG_ID1, &ksz8864_id);
357484e36ffSHelmut Buchsbaum if (err) {
358484e36ffSHelmut Buchsbaum err = -EIO;
359484e36ffSHelmut Buchsbaum goto err_out;
360484e36ffSHelmut Buchsbaum }
361484e36ffSHelmut Buchsbaum
362484e36ffSHelmut Buchsbaum if ((ksz8864_id & 0x80) &&
363484e36ffSHelmut Buchsbaum (ks->chip->chip_id == KSZ8864_CHIP_ID)) {
364484e36ffSHelmut Buchsbaum ks->revision_id = get_chip_rev(id1);
365484e36ffSHelmut Buchsbaum }
366484e36ffSHelmut Buchsbaum
367484e36ffSHelmut Buchsbaum } else {
368484e36ffSHelmut Buchsbaum dev_err(&ks->spi->dev, "unsupported chip id for KS8995 family: 0x%02x\n",
369484e36ffSHelmut Buchsbaum id1);
370484e36ffSHelmut Buchsbaum err = -ENODEV;
371484e36ffSHelmut Buchsbaum }
372484e36ffSHelmut Buchsbaum break;
373c0e6cb1fSHelmut Buchsbaum case FAMILY_KSZ8795:
374c0e6cb1fSHelmut Buchsbaum /* try reading chip id at CHIP ID1 */
375c0e6cb1fSHelmut Buchsbaum err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
376c0e6cb1fSHelmut Buchsbaum if (err) {
377c0e6cb1fSHelmut Buchsbaum err = -EIO;
378c0e6cb1fSHelmut Buchsbaum goto err_out;
379c0e6cb1fSHelmut Buchsbaum }
380c0e6cb1fSHelmut Buchsbaum
381c0e6cb1fSHelmut Buchsbaum if (get_chip_id(id1) == ks->chip->chip_id) {
382c0e6cb1fSHelmut Buchsbaum ks->revision_id = get_chip_rev(id1);
383c0e6cb1fSHelmut Buchsbaum } else {
384c0e6cb1fSHelmut Buchsbaum dev_err(&ks->spi->dev, "unsupported chip id for KSZ8795 family: 0x%02x\n",
385c0e6cb1fSHelmut Buchsbaum id1);
386c0e6cb1fSHelmut Buchsbaum err = -ENODEV;
387c0e6cb1fSHelmut Buchsbaum }
388c0e6cb1fSHelmut Buchsbaum break;
389484e36ffSHelmut Buchsbaum default:
390484e36ffSHelmut Buchsbaum dev_err(&ks->spi->dev, "unsupported family id: 0x%02x\n", id0);
391484e36ffSHelmut Buchsbaum err = -ENODEV;
392484e36ffSHelmut Buchsbaum break;
393484e36ffSHelmut Buchsbaum }
394484e36ffSHelmut Buchsbaum err_out:
395484e36ffSHelmut Buchsbaum return err;
396484e36ffSHelmut Buchsbaum }
397484e36ffSHelmut Buchsbaum
398240a12d5SPhilipp Zabel static const struct bin_attribute ks8995_registers_attr = {
399a8e510f6SFrederic LAMBERT .attr = {
400a8e510f6SFrederic LAMBERT .name = "registers",
401d61e4038SJoe Perches .mode = 0600,
402a8e510f6SFrederic LAMBERT },
403a8e510f6SFrederic LAMBERT .size = KS8995_REGS_SIZE,
404a8e510f6SFrederic LAMBERT .read = ks8995_registers_read,
405a8e510f6SFrederic LAMBERT .write = ks8995_registers_write,
406a8e510f6SFrederic LAMBERT };
407a8e510f6SFrederic LAMBERT
408a8e510f6SFrederic LAMBERT /* ------------------------------------------------------------------------ */
ks8995_probe(struct spi_device * spi)409633d1594SBill Pemberton static int ks8995_probe(struct spi_device *spi)
410a8e510f6SFrederic LAMBERT {
411a8e510f6SFrederic LAMBERT struct ks8995_switch *ks;
412a8e510f6SFrederic LAMBERT int err;
413aa54c8daSHelmut Buchsbaum int variant = spi_get_device_id(spi)->driver_data;
414a8e510f6SFrederic LAMBERT
415aa54c8daSHelmut Buchsbaum if (variant >= max_variant) {
416aa54c8daSHelmut Buchsbaum dev_err(&spi->dev, "bad chip variant %d\n", variant);
417aa54c8daSHelmut Buchsbaum return -ENODEV;
418aa54c8daSHelmut Buchsbaum }
419aa54c8daSHelmut Buchsbaum
420b32a8b64SHimangi Saraogi ks = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
421e68ed8f0SJoe Perches if (!ks)
422a8e510f6SFrederic LAMBERT return -ENOMEM;
423a8e510f6SFrederic LAMBERT
424a8e510f6SFrederic LAMBERT mutex_init(&ks->lock);
425a1459c1cSMark Brown ks->spi = spi;
426aa54c8daSHelmut Buchsbaum ks->chip = &ks8995_chip[variant];
427aa54c8daSHelmut Buchsbaum
428006534ecSDmitry Torokhov ks->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
429006534ecSDmitry Torokhov GPIOD_OUT_HIGH);
430006534ecSDmitry Torokhov err = PTR_ERR_OR_ZERO(ks->reset_gpio);
431cd6f288cSHelmut Buchsbaum if (err) {
432cd6f288cSHelmut Buchsbaum dev_err(&spi->dev,
433006534ecSDmitry Torokhov "failed to get reset gpio: %d\n", err);
434006534ecSDmitry Torokhov return err;
435cd6f288cSHelmut Buchsbaum }
436cd6f288cSHelmut Buchsbaum
437006534ecSDmitry Torokhov err = gpiod_set_consumer_name(ks->reset_gpio, "switch-reset");
438006534ecSDmitry Torokhov if (err)
439006534ecSDmitry Torokhov return err;
440006534ecSDmitry Torokhov
441006534ecSDmitry Torokhov /* de-assert switch reset */
442006534ecSDmitry Torokhov /* FIXME: this likely requires a delay */
443006534ecSDmitry Torokhov gpiod_set_value_cansleep(ks->reset_gpio, 0);
444cd6f288cSHelmut Buchsbaum
4455d5f1846SJingoo Han spi_set_drvdata(spi, ks);
446a8e510f6SFrederic LAMBERT
447a8e510f6SFrederic LAMBERT spi->mode = SPI_MODE_0;
448a8e510f6SFrederic LAMBERT spi->bits_per_word = 8;
449a8e510f6SFrederic LAMBERT err = spi_setup(spi);
450a8e510f6SFrederic LAMBERT if (err) {
451a8e510f6SFrederic LAMBERT dev_err(&spi->dev, "spi_setup failed, err=%d\n", err);
452b32a8b64SHimangi Saraogi return err;
453a8e510f6SFrederic LAMBERT }
454a8e510f6SFrederic LAMBERT
455484e36ffSHelmut Buchsbaum err = ks8995_get_revision(ks);
456484e36ffSHelmut Buchsbaum if (err)
457b32a8b64SHimangi Saraogi return err;
458a8e510f6SFrederic LAMBERT
459240a12d5SPhilipp Zabel memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
460239870f2SBlomme, Maarten ks->regs_attr.size = ks->chip->regs_size;
461240a12d5SPhilipp Zabel
462a8e510f6SFrederic LAMBERT err = ks8995_reset(ks);
463a8e510f6SFrederic LAMBERT if (err)
464b32a8b64SHimangi Saraogi return err;
465a8e510f6SFrederic LAMBERT
4664342696dSBlomme, Maarten sysfs_attr_init(&ks->regs_attr.attr);
467240a12d5SPhilipp Zabel err = sysfs_create_bin_file(&spi->dev.kobj, &ks->regs_attr);
468a8e510f6SFrederic LAMBERT if (err) {
469a8e510f6SFrederic LAMBERT dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",
470a8e510f6SFrederic LAMBERT err);
471b32a8b64SHimangi Saraogi return err;
472a8e510f6SFrederic LAMBERT }
473a8e510f6SFrederic LAMBERT
474484e36ffSHelmut Buchsbaum dev_info(&spi->dev, "%s device found, Chip ID:%x, Revision:%x\n",
475484e36ffSHelmut Buchsbaum ks->chip->name, ks->chip->chip_id, ks->revision_id);
476a8e510f6SFrederic LAMBERT
477a8e510f6SFrederic LAMBERT return 0;
478a8e510f6SFrederic LAMBERT }
479a8e510f6SFrederic LAMBERT
ks8995_remove(struct spi_device * spi)480a0386bbaSUwe Kleine-König static void ks8995_remove(struct spi_device *spi)
481a8e510f6SFrederic LAMBERT {
48230349bdbSVladimir Zapolskiy struct ks8995_switch *ks = spi_get_drvdata(spi);
48330349bdbSVladimir Zapolskiy
48430349bdbSVladimir Zapolskiy sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);
485a8e510f6SFrederic LAMBERT
486cd6f288cSHelmut Buchsbaum /* assert reset */
487006534ecSDmitry Torokhov gpiod_set_value_cansleep(ks->reset_gpio, 1);
488a8e510f6SFrederic LAMBERT }
489a8e510f6SFrederic LAMBERT
490a8e510f6SFrederic LAMBERT /* ------------------------------------------------------------------------ */
491a8e510f6SFrederic LAMBERT static struct spi_driver ks8995_driver = {
492a8e510f6SFrederic LAMBERT .driver = {
493a8e510f6SFrederic LAMBERT .name = "spi-ks8995",
494*b0b7d1b6SKrzysztof Kozlowski .of_match_table = ks8895_spi_of_match,
495a8e510f6SFrederic LAMBERT },
496a8e510f6SFrederic LAMBERT .probe = ks8995_probe,
497633d1594SBill Pemberton .remove = ks8995_remove,
498aa54c8daSHelmut Buchsbaum .id_table = ks8995_id,
499a8e510f6SFrederic LAMBERT };
500a8e510f6SFrederic LAMBERT
5011a9561a3SSachin Kamat module_spi_driver(ks8995_driver);
502a8e510f6SFrederic LAMBERT
503a8e510f6SFrederic LAMBERT MODULE_DESCRIPTION(DRV_DESC);
504a8e510f6SFrederic LAMBERT MODULE_VERSION(DRV_VERSION);
505a8e510f6SFrederic LAMBERT MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
506a8e510f6SFrederic LAMBERT MODULE_LICENSE("GPL v2");
507