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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 | ||
56 | static struct phy_ops phy_ops = { | |
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 | { | |
64 | struct gpio_desc *gpio; | |
65 | struct tusb1210 *tusb; | |
66 | u8 val, reg; | |
67 | int ret; | |
68 | ||
69 | tusb = devm_kzalloc(&ulpi->dev, sizeof(*tusb), GFP_KERNEL); | |
70 | if (!tusb) | |
71 | return -ENOMEM; | |
72 | ||
73 | gpio = devm_gpiod_get(&ulpi->dev, "reset"); | |
74 | if (!IS_ERR(gpio)) { | |
75 | ret = gpiod_direction_output(gpio, 0); | |
76 | if (ret) | |
77 | return ret; | |
78 | gpiod_set_value_cansleep(gpio, 1); | |
79 | tusb->gpio_reset = gpio; | |
80 | } | |
81 | ||
82 | gpio = devm_gpiod_get(&ulpi->dev, "cs"); | |
83 | if (!IS_ERR(gpio)) { | |
84 | ret = gpiod_direction_output(gpio, 0); | |
85 | if (ret) | |
86 | return ret; | |
87 | gpiod_set_value_cansleep(gpio, 1); | |
88 | tusb->gpio_cs = gpio; | |
89 | } | |
90 | ||
91 | /* | |
92 | * VENDOR_SPECIFIC2 register in TUSB1210 can be used for configuring eye | |
93 | * diagram optimization and DP/DM swap. | |
94 | */ | |
95 | ||
96 | /* High speed output drive strength configuration */ | |
97 | device_property_read_u8(&ulpi->dev, "ihstx", &val); | |
98 | reg = val << TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT; | |
99 | ||
100 | /* High speed output impedance configuration */ | |
101 | device_property_read_u8(&ulpi->dev, "zhsdrv", &val); | |
102 | reg |= val << TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT; | |
103 | ||
104 | /* DP/DM swap control */ | |
105 | device_property_read_u8(&ulpi->dev, "datapolarity", &val); | |
106 | reg |= val << TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT; | |
107 | ||
108 | if (reg) { | |
109 | ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg); | |
110 | tusb->vendor_specific2 = reg; | |
111 | } | |
112 | ||
113 | tusb->phy = ulpi_phy_create(ulpi, &phy_ops); | |
114 | if (IS_ERR(tusb->phy)) | |
115 | return PTR_ERR(tusb->phy); | |
116 | ||
117 | tusb->ulpi = ulpi; | |
118 | ||
119 | phy_set_drvdata(tusb->phy, tusb); | |
120 | ulpi_set_drvdata(ulpi, tusb); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static void tusb1210_remove(struct ulpi *ulpi) | |
125 | { | |
126 | struct tusb1210 *tusb = ulpi_get_drvdata(ulpi); | |
127 | ||
128 | ulpi_phy_destroy(ulpi, tusb->phy); | |
129 | } | |
130 | ||
131 | #define TI_VENDOR_ID 0x0451 | |
132 | ||
133 | static const struct ulpi_device_id tusb1210_ulpi_id[] = { | |
134 | { TI_VENDOR_ID, 0x1507, }, | |
135 | { }, | |
136 | }; | |
137 | MODULE_DEVICE_TABLE(ulpi, tusb1210_ulpi_id); | |
138 | ||
139 | static struct ulpi_driver tusb1210_driver = { | |
140 | .id_table = tusb1210_ulpi_id, | |
141 | .probe = tusb1210_probe, | |
142 | .remove = tusb1210_remove, | |
143 | .driver = { | |
144 | .name = "tusb1210", | |
145 | .owner = THIS_MODULE, | |
146 | }, | |
147 | }; | |
148 | ||
149 | module_ulpi_driver(tusb1210_driver); | |
150 | ||
151 | MODULE_AUTHOR("Intel Corporation"); | |
152 | MODULE_LICENSE("GPL v2"); | |
153 | MODULE_DESCRIPTION("TUSB1210 ULPI PHY driver"); |