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1c14905e HK |
1 | /** |
2 | * tusb1210.c - TUSB1210 USB ULPI PHY driver | |
3 | * | |
4 | * Copyright (C) 2015 Intel Corporation | |
5 | * | |
6 | * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | #include <linux/module.h> | |
13 | #include <linux/ulpi/driver.h> | |
14 | #include <linux/gpio/consumer.h> | |
15 | ||
16 | #include "ulpi_phy.h" | |
17 | ||
18 | #define TUSB1210_VENDOR_SPECIFIC2 0x80 | |
19 | #define TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT 0 | |
20 | #define TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT 4 | |
21 | #define TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT 6 | |
22 | ||
23 | struct tusb1210 { | |
24 | struct ulpi *ulpi; | |
25 | struct phy *phy; | |
26 | struct gpio_desc *gpio_reset; | |
27 | struct gpio_desc *gpio_cs; | |
28 | u8 vendor_specific2; | |
29 | }; | |
30 | ||
31 | static int tusb1210_power_on(struct phy *phy) | |
32 | { | |
33 | struct tusb1210 *tusb = phy_get_drvdata(phy); | |
34 | ||
35 | gpiod_set_value_cansleep(tusb->gpio_reset, 1); | |
36 | gpiod_set_value_cansleep(tusb->gpio_cs, 1); | |
37 | ||
38 | /* Restore the optional eye diagram optimization value */ | |
39 | if (tusb->vendor_specific2) | |
40 | ulpi_write(tusb->ulpi, TUSB1210_VENDOR_SPECIFIC2, | |
41 | tusb->vendor_specific2); | |
42 | ||
43 | return 0; | |
44 | } | |
45 | ||
46 | static int tusb1210_power_off(struct phy *phy) | |
47 | { | |
48 | struct tusb1210 *tusb = phy_get_drvdata(phy); | |
49 | ||
50 | gpiod_set_value_cansleep(tusb->gpio_reset, 0); | |
51 | gpiod_set_value_cansleep(tusb->gpio_cs, 0); | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
4a9e5ca1 | 56 | static const struct phy_ops phy_ops = { |
1c14905e HK |
57 | .power_on = tusb1210_power_on, |
58 | .power_off = tusb1210_power_off, | |
59 | .owner = THIS_MODULE, | |
60 | }; | |
61 | ||
62 | static int tusb1210_probe(struct ulpi *ulpi) | |
63 | { | |
1c14905e HK |
64 | struct tusb1210 *tusb; |
65 | u8 val, reg; | |
1c14905e HK |
66 | |
67 | tusb = devm_kzalloc(&ulpi->dev, sizeof(*tusb), GFP_KERNEL); | |
68 | if (!tusb) | |
69 | return -ENOMEM; | |
70 | ||
8e71c680 UKK |
71 | tusb->gpio_reset = devm_gpiod_get_optional(&ulpi->dev, "reset", |
72 | GPIOD_OUT_LOW); | |
73 | if (IS_ERR(tusb->gpio_reset)) | |
74 | return PTR_ERR(tusb->gpio_reset); | |
75 | ||
76 | gpiod_set_value_cansleep(tusb->gpio_reset, 1); | |
77 | ||
78 | tusb->gpio_cs = devm_gpiod_get_optional(&ulpi->dev, "cs", | |
79 | GPIOD_OUT_LOW); | |
80 | if (IS_ERR(tusb->gpio_cs)) | |
81 | return PTR_ERR(tusb->gpio_cs); | |
82 | ||
83 | gpiod_set_value_cansleep(tusb->gpio_cs, 1); | |
1c14905e HK |
84 | |
85 | /* | |
86 | * VENDOR_SPECIFIC2 register in TUSB1210 can be used for configuring eye | |
87 | * diagram optimization and DP/DM swap. | |
88 | */ | |
89 | ||
90 | /* High speed output drive strength configuration */ | |
91 | device_property_read_u8(&ulpi->dev, "ihstx", &val); | |
92 | reg = val << TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT; | |
93 | ||
94 | /* High speed output impedance configuration */ | |
95 | device_property_read_u8(&ulpi->dev, "zhsdrv", &val); | |
96 | reg |= val << TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT; | |
97 | ||
98 | /* DP/DM swap control */ | |
99 | device_property_read_u8(&ulpi->dev, "datapolarity", &val); | |
100 | reg |= val << TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT; | |
101 | ||
102 | if (reg) { | |
103 | ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg); | |
104 | tusb->vendor_specific2 = reg; | |
105 | } | |
106 | ||
107 | tusb->phy = ulpi_phy_create(ulpi, &phy_ops); | |
108 | if (IS_ERR(tusb->phy)) | |
109 | return PTR_ERR(tusb->phy); | |
110 | ||
111 | tusb->ulpi = ulpi; | |
112 | ||
113 | phy_set_drvdata(tusb->phy, tusb); | |
114 | ulpi_set_drvdata(ulpi, tusb); | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static void tusb1210_remove(struct ulpi *ulpi) | |
119 | { | |
120 | struct tusb1210 *tusb = ulpi_get_drvdata(ulpi); | |
121 | ||
122 | ulpi_phy_destroy(ulpi, tusb->phy); | |
123 | } | |
124 | ||
125 | #define TI_VENDOR_ID 0x0451 | |
126 | ||
127 | static const struct ulpi_device_id tusb1210_ulpi_id[] = { | |
128 | { TI_VENDOR_ID, 0x1507, }, | |
129 | { }, | |
130 | }; | |
131 | MODULE_DEVICE_TABLE(ulpi, tusb1210_ulpi_id); | |
132 | ||
133 | static struct ulpi_driver tusb1210_driver = { | |
134 | .id_table = tusb1210_ulpi_id, | |
135 | .probe = tusb1210_probe, | |
136 | .remove = tusb1210_remove, | |
137 | .driver = { | |
138 | .name = "tusb1210", | |
139 | .owner = THIS_MODULE, | |
140 | }, | |
141 | }; | |
142 | ||
143 | module_ulpi_driver(tusb1210_driver); | |
144 | ||
145 | MODULE_AUTHOR("Intel Corporation"); | |
146 | MODULE_LICENSE("GPL v2"); | |
147 | MODULE_DESCRIPTION("TUSB1210 ULPI PHY driver"); |