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
22 KSZ_REGMAP_TABLE(ksz9477, 32, SPI_ADDR_SHIFT,
23 SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN);
24
ksz9477_spi_probe(struct spi_device * spi)25 static 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
ksz9477_spi_remove(struct spi_device * spi)62 static 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
ksz9477_spi_shutdown(struct spi_device * spi)72 static 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
80 static 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 };
89 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
90
91 static const struct spi_device_id ksz9477_spi_ids[] = {
92 { "ksz9477" },
93 { "ksz9897" },
94 { "ksz9893" },
95 { "ksz9563" },
96 { "ksz8563" },
97 { "ksz9567" },
98 { },
99 };
100 MODULE_DEVICE_TABLE(spi, ksz9477_spi_ids);
101
102 static struct spi_driver ksz9477_spi_driver = {
103 .driver = {
104 .name = "ksz9477-switch",
105 .owner = THIS_MODULE,
106 .of_match_table = of_match_ptr(ksz9477_dt_ids),
107 },
108 .id_table = ksz9477_spi_ids,
109 .probe = ksz9477_spi_probe,
110 .remove = ksz9477_spi_remove,
111 .shutdown = ksz9477_spi_shutdown,
112 };
113
114 module_spi_driver(ksz9477_spi_driver);
115
116 MODULE_ALIAS("spi:ksz9477");
117 MODULE_ALIAS("spi:ksz9897");
118 MODULE_ALIAS("spi:ksz9893");
119 MODULE_ALIAS("spi:ksz9563");
120 MODULE_ALIAS("spi:ksz8563");
121 MODULE_ALIAS("spi:ksz9567");
122 MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
123 MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
124 MODULE_LICENSE("GPL");
125