1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Intel LPSS ACPI support.
4 *
5 * Copyright (C) 2015, Intel Corporation
6 *
7 * Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
8 * Mika Westerberg <mika.westerberg@linux.intel.com>
9 */
10
11 #include <linux/acpi.h>
12 #include <linux/ioport.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/platform_device.h>
17 #include <linux/property.h>
18
19 #include "intel-lpss.h"
20
21 static const struct intel_lpss_platform_info spt_info = {
22 .clk_rate = 120000000,
23 };
24
25 static struct property_entry spt_i2c_properties[] = {
26 PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 230),
27 { },
28 };
29
30 static const struct intel_lpss_platform_info spt_i2c_info = {
31 .clk_rate = 120000000,
32 .properties = spt_i2c_properties,
33 };
34
35 static struct property_entry uart_properties[] = {
36 PROPERTY_ENTRY_U32("reg-io-width", 4),
37 PROPERTY_ENTRY_U32("reg-shift", 2),
38 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
39 { },
40 };
41
42 static const struct intel_lpss_platform_info spt_uart_info = {
43 .clk_rate = 120000000,
44 .clk_con_id = "baudclk",
45 .properties = uart_properties,
46 };
47
48 static const struct intel_lpss_platform_info bxt_info = {
49 .clk_rate = 100000000,
50 };
51
52 static struct property_entry bxt_i2c_properties[] = {
53 PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 42),
54 PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
55 PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
56 { },
57 };
58
59 static const struct intel_lpss_platform_info bxt_i2c_info = {
60 .clk_rate = 133000000,
61 .properties = bxt_i2c_properties,
62 };
63
64 static struct property_entry apl_i2c_properties[] = {
65 PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 207),
66 PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
67 PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
68 { },
69 };
70
71 static const struct intel_lpss_platform_info apl_i2c_info = {
72 .clk_rate = 133000000,
73 .properties = apl_i2c_properties,
74 };
75
76 static const struct acpi_device_id intel_lpss_acpi_ids[] = {
77 /* SPT */
78 { "INT3440", (kernel_ulong_t)&spt_info },
79 { "INT3441", (kernel_ulong_t)&spt_info },
80 { "INT3442", (kernel_ulong_t)&spt_i2c_info },
81 { "INT3443", (kernel_ulong_t)&spt_i2c_info },
82 { "INT3444", (kernel_ulong_t)&spt_i2c_info },
83 { "INT3445", (kernel_ulong_t)&spt_i2c_info },
84 { "INT3446", (kernel_ulong_t)&spt_i2c_info },
85 { "INT3447", (kernel_ulong_t)&spt_i2c_info },
86 { "INT3448", (kernel_ulong_t)&spt_uart_info },
87 { "INT3449", (kernel_ulong_t)&spt_uart_info },
88 { "INT344A", (kernel_ulong_t)&spt_uart_info },
89 /* BXT */
90 { "80860AAC", (kernel_ulong_t)&bxt_i2c_info },
91 { "80860ABC", (kernel_ulong_t)&bxt_info },
92 { "80860AC2", (kernel_ulong_t)&bxt_info },
93 /* APL */
94 { "80865AAC", (kernel_ulong_t)&apl_i2c_info },
95 { "80865ABC", (kernel_ulong_t)&bxt_info },
96 { "80865AC2", (kernel_ulong_t)&bxt_info },
97 { }
98 };
99 MODULE_DEVICE_TABLE(acpi, intel_lpss_acpi_ids);
100
intel_lpss_acpi_probe(struct platform_device * pdev)101 static int intel_lpss_acpi_probe(struct platform_device *pdev)
102 {
103 struct intel_lpss_platform_info *info;
104 const struct acpi_device_id *id;
105 int ret;
106
107 id = acpi_match_device(intel_lpss_acpi_ids, &pdev->dev);
108 if (!id)
109 return -ENODEV;
110
111 info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
112 GFP_KERNEL);
113 if (!info)
114 return -ENOMEM;
115
116 info->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
117 info->irq = platform_get_irq(pdev, 0);
118
119 ret = intel_lpss_probe(&pdev->dev, info);
120 if (ret)
121 return ret;
122
123 pm_runtime_set_active(&pdev->dev);
124 pm_runtime_enable(&pdev->dev);
125
126 return 0;
127 }
128
intel_lpss_acpi_remove(struct platform_device * pdev)129 static int intel_lpss_acpi_remove(struct platform_device *pdev)
130 {
131 intel_lpss_remove(&pdev->dev);
132 pm_runtime_disable(&pdev->dev);
133
134 return 0;
135 }
136
137 static INTEL_LPSS_PM_OPS(intel_lpss_acpi_pm_ops);
138
139 static struct platform_driver intel_lpss_acpi_driver = {
140 .probe = intel_lpss_acpi_probe,
141 .remove = intel_lpss_acpi_remove,
142 .driver = {
143 .name = "intel-lpss",
144 .acpi_match_table = intel_lpss_acpi_ids,
145 .pm = &intel_lpss_acpi_pm_ops,
146 },
147 };
148
149 module_platform_driver(intel_lpss_acpi_driver);
150
151 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
152 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
153 MODULE_DESCRIPTION("Intel LPSS ACPI driver");
154 MODULE_LICENSE("GPL v2");
155