Commit | Line | Data |
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4fdf4d23 | 1 | // SPDX-License-Identifier: GPL-2.0 |
fd507e2f AZ |
2 | /* |
3 | * A driver for the RTC embedded in the Cirrus Logic EP93XX processors | |
4 | * Copyright (c) 2006 Tower Technologies | |
5 | * | |
6 | * Author: Alessandro Zummo <a.zummo@towertech.it> | |
fd507e2f AZ |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/rtc.h> | |
11 | #include <linux/platform_device.h> | |
38f7b009 | 12 | #include <linux/io.h> |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
38f7b009 HS |
14 | |
15 | #define EP93XX_RTC_DATA 0x000 | |
16 | #define EP93XX_RTC_MATCH 0x004 | |
17 | #define EP93XX_RTC_STATUS 0x008 | |
d71c7715 | 18 | #define EP93XX_RTC_STATUS_INTR BIT(0) |
38f7b009 HS |
19 | #define EP93XX_RTC_LOAD 0x00C |
20 | #define EP93XX_RTC_CONTROL 0x010 | |
d71c7715 | 21 | #define EP93XX_RTC_CONTROL_MIE BIT(0) |
38f7b009 HS |
22 | #define EP93XX_RTC_SWCOMP 0x108 |
23 | #define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000 | |
24 | #define EP93XX_RTC_SWCOMP_DEL_SHIFT 16 | |
25 | #define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff | |
26 | #define EP93XX_RTC_SWCOMP_INT_SHIFT 0 | |
27 | ||
38f7b009 HS |
28 | struct ep93xx_rtc { |
29 | void __iomem *mmio_base; | |
bf6ed027 | 30 | struct rtc_device *rtc; |
38f7b009 | 31 | }; |
fd507e2f | 32 | |
38f7b009 | 33 | static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, |
d71c7715 | 34 | unsigned short *delete) |
fd507e2f | 35 | { |
28dc5f80 | 36 | struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); |
38f7b009 HS |
37 | unsigned long comp; |
38 | ||
ff32ff17 | 39 | comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); |
fd507e2f AZ |
40 | |
41 | if (preload) | |
38f7b009 HS |
42 | *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) |
43 | >> EP93XX_RTC_SWCOMP_INT_SHIFT; | |
fd507e2f AZ |
44 | |
45 | if (delete) | |
38f7b009 HS |
46 | *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) |
47 | >> EP93XX_RTC_SWCOMP_DEL_SHIFT; | |
fd507e2f AZ |
48 | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
53 | { | |
28dc5f80 | 54 | struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); |
38f7b009 HS |
55 | unsigned long time; |
56 | ||
725412d9 | 57 | time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); |
fd507e2f | 58 | |
886a77e7 | 59 | rtc_time64_to_tm(time, tm); |
fd507e2f AZ |
60 | return 0; |
61 | } | |
62 | ||
ef9440a2 | 63 | static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm) |
fd507e2f | 64 | { |
28dc5f80 | 65 | struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); |
ef9440a2 | 66 | unsigned long secs = rtc_tm_to_time64(tm); |
38f7b009 | 67 | |
ff32ff17 | 68 | writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); |
fd507e2f AZ |
69 | return 0; |
70 | } | |
71 | ||
fd507e2f AZ |
72 | static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) |
73 | { | |
74 | unsigned short preload, delete; | |
75 | ||
38f7b009 | 76 | ep93xx_rtc_get_swcomp(dev, &preload, &delete); |
fd507e2f | 77 | |
fd507e2f AZ |
78 | seq_printf(seq, "preload\t\t: %d\n", preload); |
79 | seq_printf(seq, "delete\t\t: %d\n", delete); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
ff8371ac | 84 | static const struct rtc_class_ops ep93xx_rtc_ops = { |
fd507e2f | 85 | .read_time = ep93xx_rtc_read_time, |
ef9440a2 | 86 | .set_time = ep93xx_rtc_set_time, |
fd507e2f AZ |
87 | .proc = ep93xx_rtc_proc, |
88 | }; | |
89 | ||
d71c7715 AB |
90 | static ssize_t comp_preload_show(struct device *dev, |
91 | struct device_attribute *attr, char *buf) | |
fd507e2f AZ |
92 | { |
93 | unsigned short preload; | |
94 | ||
09cd030b | 95 | ep93xx_rtc_get_swcomp(dev->parent, &preload, NULL); |
fd507e2f AZ |
96 | |
97 | return sprintf(buf, "%d\n", preload); | |
98 | } | |
d71c7715 | 99 | static DEVICE_ATTR_RO(comp_preload); |
fd507e2f | 100 | |
d71c7715 AB |
101 | static ssize_t comp_delete_show(struct device *dev, |
102 | struct device_attribute *attr, char *buf) | |
fd507e2f AZ |
103 | { |
104 | unsigned short delete; | |
105 | ||
09cd030b | 106 | ep93xx_rtc_get_swcomp(dev->parent, NULL, &delete); |
fd507e2f AZ |
107 | |
108 | return sprintf(buf, "%d\n", delete); | |
109 | } | |
d71c7715 | 110 | static DEVICE_ATTR_RO(comp_delete); |
fd507e2f | 111 | |
b4877d2b HS |
112 | static struct attribute *ep93xx_rtc_attrs[] = { |
113 | &dev_attr_comp_preload.attr, | |
114 | &dev_attr_comp_delete.attr, | |
115 | NULL | |
116 | }; | |
117 | ||
118 | static const struct attribute_group ep93xx_rtc_sysfs_files = { | |
119 | .attrs = ep93xx_rtc_attrs, | |
120 | }; | |
fd507e2f | 121 | |
5a167f45 | 122 | static int ep93xx_rtc_probe(struct platform_device *pdev) |
fd507e2f | 123 | { |
38f7b009 | 124 | struct ep93xx_rtc *ep93xx_rtc; |
38f7b009 HS |
125 | int err; |
126 | ||
b4877d2b HS |
127 | ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL); |
128 | if (!ep93xx_rtc) | |
38f7b009 HS |
129 | return -ENOMEM; |
130 | ||
09ef18bc | 131 | ep93xx_rtc->mmio_base = devm_platform_ioremap_resource(pdev, 0); |
7c1d69ee JL |
132 | if (IS_ERR(ep93xx_rtc->mmio_base)) |
133 | return PTR_ERR(ep93xx_rtc->mmio_base); | |
fd507e2f | 134 | |
bf6ed027 | 135 | platform_set_drvdata(pdev, ep93xx_rtc); |
38f7b009 | 136 | |
bac68b30 | 137 | ep93xx_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); |
b809d192 AB |
138 | if (IS_ERR(ep93xx_rtc->rtc)) |
139 | return PTR_ERR(ep93xx_rtc->rtc); | |
fd507e2f | 140 | |
bac68b30 | 141 | ep93xx_rtc->rtc->ops = &ep93xx_rtc_ops; |
2d4fc6df | 142 | ep93xx_rtc->rtc->range_max = U32_MAX; |
bac68b30 | 143 | |
09cd030b | 144 | err = rtc_add_group(ep93xx_rtc->rtc, &ep93xx_rtc_sysfs_files); |
bac68b30 AB |
145 | if (err) |
146 | return err; | |
147 | ||
09cd030b | 148 | return rtc_register_device(ep93xx_rtc->rtc); |
fd507e2f AZ |
149 | } |
150 | ||
38f7b009 | 151 | static struct platform_driver ep93xx_rtc_driver = { |
fd507e2f AZ |
152 | .driver = { |
153 | .name = "ep93xx-rtc", | |
fd507e2f | 154 | }, |
84d56b38 | 155 | .probe = ep93xx_rtc_probe, |
fd507e2f AZ |
156 | }; |
157 | ||
84d56b38 | 158 | module_platform_driver(ep93xx_rtc_driver); |
fd507e2f AZ |
159 | |
160 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
161 | MODULE_DESCRIPTION("EP93XX RTC driver"); | |
162 | MODULE_LICENSE("GPL"); | |
84d56b38 | 163 | MODULE_ALIAS("platform:ep93xx-rtc"); |