tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Microchip KSZ9477 series register access through SPI
4 *
5 * Copyright (C) 2017-2019 Microchip Technology Inc.
6 */
7
8#include <asm/unaligned.h>
9
10#include <linux/delay.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/regmap.h>
14#include <linux/spi/spi.h>
15
16#include "ksz_common.h"
17
18#define SPI_ADDR_SHIFT 24
19#define SPI_ADDR_ALIGN 3
20#define SPI_TURNAROUND_SHIFT 5
21
22KSZ_REGMAP_TABLE(ksz9477, 32, SPI_ADDR_SHIFT,
23 SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN);
24
25static int ksz9477_spi_probe(struct spi_device *spi)
26{
27 struct regmap_config rc;
28 struct ksz_device *dev;
29 int i, ret;
30
31 dev = ksz_switch_alloc(&spi->dev, spi);
32 if (!dev)
33 return -ENOMEM;
34
35 for (i = 0; i < ARRAY_SIZE(ksz9477_regmap_config); i++) {
36 rc = ksz9477_regmap_config[i];
37 rc.lock_arg = &dev->regmap_mutex;
38 dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
39 if (IS_ERR(dev->regmap[i])) {
40 ret = PTR_ERR(dev->regmap[i]);
41 dev_err(&spi->dev,
42 "Failed to initialize regmap%i: %d\n",
43 ksz9477_regmap_config[i].val_bits, ret);
44 return ret;
45 }
46 }
47
48 if (spi->dev.platform_data)
49 dev->pdata = spi->dev.platform_data;
50
51 ret = ksz9477_switch_register(dev);
52
53 /* Main DSA driver may not be started yet. */
54 if (ret)
55 return ret;
56
57 spi_set_drvdata(spi, dev);
58
59 return 0;
60}
61
62static int ksz9477_spi_remove(struct spi_device *spi)
63{
64 struct ksz_device *dev = spi_get_drvdata(spi);
65
66 if (dev)
67 ksz_switch_remove(dev);
68
69 return 0;
70}
71
72static void ksz9477_spi_shutdown(struct spi_device *spi)
73{
74 struct ksz_device *dev = spi_get_drvdata(spi);
75
76 if (dev && dev->dev_ops->shutdown)
77 dev->dev_ops->shutdown(dev);
78}
79
80static const struct of_device_id ksz9477_dt_ids[] = {
81 { .compatible = "microchip,ksz9477" },
82 { .compatible = "microchip,ksz9897" },
83 { .compatible = "microchip,ksz9893" },
84 { .compatible = "microchip,ksz9563" },
85 { .compatible = "microchip,ksz8563" },
86 { .compatible = "microchip,ksz9567" },
87 {},
88};
89MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
90
91static struct spi_driver ksz9477_spi_driver = {
92 .driver = {
93 .name = "ksz9477-switch",
94 .owner = THIS_MODULE,
95 .of_match_table = of_match_ptr(ksz9477_dt_ids),
96 },
97 .probe = ksz9477_spi_probe,
98 .remove = ksz9477_spi_remove,
99 .shutdown = ksz9477_spi_shutdown,
100};
101
102module_spi_driver(ksz9477_spi_driver);
103
104MODULE_ALIAS("spi:ksz9477");
105MODULE_ALIAS("spi:ksz9897");
106MODULE_ALIAS("spi:ksz9893");
107MODULE_ALIAS("spi:ksz9563");
108MODULE_ALIAS("spi:ksz8563");
109MODULE_ALIAS("spi:ksz9567");
110MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
111MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
112MODULE_LICENSE("GPL");