1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Microchip KSZ8795 series register access through SPI
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2017 Microchip Technology Inc.
6*4882a593Smuzhiyun * Tristram Ha <Tristram.Ha@microchip.com>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <asm/unaligned.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/delay.h>
12*4882a593Smuzhiyun #include <linux/kernel.h>
13*4882a593Smuzhiyun #include <linux/module.h>
14*4882a593Smuzhiyun #include <linux/regmap.h>
15*4882a593Smuzhiyun #include <linux/spi/spi.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include "ksz_common.h"
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #define SPI_ADDR_SHIFT 12
20*4882a593Smuzhiyun #define SPI_ADDR_ALIGN 3
21*4882a593Smuzhiyun #define SPI_TURNAROUND_SHIFT 1
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun KSZ_REGMAP_TABLE(ksz8795, 16, SPI_ADDR_SHIFT,
24*4882a593Smuzhiyun SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN);
25*4882a593Smuzhiyun
ksz8795_spi_probe(struct spi_device * spi)26*4882a593Smuzhiyun static int ksz8795_spi_probe(struct spi_device *spi)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun struct regmap_config rc;
29*4882a593Smuzhiyun struct ksz_device *dev;
30*4882a593Smuzhiyun int i, ret;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun dev = ksz_switch_alloc(&spi->dev, spi);
33*4882a593Smuzhiyun if (!dev)
34*4882a593Smuzhiyun return -ENOMEM;
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(ksz8795_regmap_config); i++) {
37*4882a593Smuzhiyun rc = ksz8795_regmap_config[i];
38*4882a593Smuzhiyun rc.lock_arg = &dev->regmap_mutex;
39*4882a593Smuzhiyun dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
40*4882a593Smuzhiyun if (IS_ERR(dev->regmap[i])) {
41*4882a593Smuzhiyun ret = PTR_ERR(dev->regmap[i]);
42*4882a593Smuzhiyun dev_err(&spi->dev,
43*4882a593Smuzhiyun "Failed to initialize regmap%i: %d\n",
44*4882a593Smuzhiyun ksz8795_regmap_config[i].val_bits, ret);
45*4882a593Smuzhiyun return ret;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun if (spi->dev.platform_data)
50*4882a593Smuzhiyun dev->pdata = spi->dev.platform_data;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun ret = ksz8795_switch_register(dev);
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun /* Main DSA driver may not be started yet. */
55*4882a593Smuzhiyun if (ret)
56*4882a593Smuzhiyun return ret;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun spi_set_drvdata(spi, dev);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun return 0;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
ksz8795_spi_remove(struct spi_device * spi)63*4882a593Smuzhiyun static int ksz8795_spi_remove(struct spi_device *spi)
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun struct ksz_device *dev = spi_get_drvdata(spi);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun if (dev)
68*4882a593Smuzhiyun ksz_switch_remove(dev);
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun return 0;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
ksz8795_spi_shutdown(struct spi_device * spi)73*4882a593Smuzhiyun static void ksz8795_spi_shutdown(struct spi_device *spi)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun struct ksz_device *dev = spi_get_drvdata(spi);
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun if (dev && dev->dev_ops->shutdown)
78*4882a593Smuzhiyun dev->dev_ops->shutdown(dev);
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static const struct of_device_id ksz8795_dt_ids[] = {
82*4882a593Smuzhiyun { .compatible = "microchip,ksz8765" },
83*4882a593Smuzhiyun { .compatible = "microchip,ksz8794" },
84*4882a593Smuzhiyun { .compatible = "microchip,ksz8795" },
85*4882a593Smuzhiyun {},
86*4882a593Smuzhiyun };
87*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, ksz8795_dt_ids);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun static const struct spi_device_id ksz8795_spi_ids[] = {
90*4882a593Smuzhiyun { "ksz8765" },
91*4882a593Smuzhiyun { "ksz8794" },
92*4882a593Smuzhiyun { "ksz8795" },
93*4882a593Smuzhiyun { "ksz8863" },
94*4882a593Smuzhiyun { "ksz8873" },
95*4882a593Smuzhiyun { },
96*4882a593Smuzhiyun };
97*4882a593Smuzhiyun MODULE_DEVICE_TABLE(spi, ksz8795_spi_ids);
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun static struct spi_driver ksz8795_spi_driver = {
100*4882a593Smuzhiyun .driver = {
101*4882a593Smuzhiyun .name = "ksz8795-switch",
102*4882a593Smuzhiyun .owner = THIS_MODULE,
103*4882a593Smuzhiyun .of_match_table = of_match_ptr(ksz8795_dt_ids),
104*4882a593Smuzhiyun },
105*4882a593Smuzhiyun .id_table = ksz8795_spi_ids,
106*4882a593Smuzhiyun .probe = ksz8795_spi_probe,
107*4882a593Smuzhiyun .remove = ksz8795_spi_remove,
108*4882a593Smuzhiyun .shutdown = ksz8795_spi_shutdown,
109*4882a593Smuzhiyun };
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun module_spi_driver(ksz8795_spi_driver);
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
114*4882a593Smuzhiyun MODULE_DESCRIPTION("Microchip KSZ8795 Series Switch SPI Driver");
115*4882a593Smuzhiyun MODULE_LICENSE("GPL");
116