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12#include <linux/module.h>
13#include <linux/rtc.h>
14#include <linux/platform_device.h>
15#include <linux/io.h>
16#include <linux/gfp.h>
17
18#define EP93XX_RTC_DATA 0x000
19#define EP93XX_RTC_MATCH 0x004
20#define EP93XX_RTC_STATUS 0x008
21#define EP93XX_RTC_STATUS_INTR (1<<0)
22#define EP93XX_RTC_LOAD 0x00C
23#define EP93XX_RTC_CONTROL 0x010
24#define EP93XX_RTC_CONTROL_MIE (1<<0)
25#define EP93XX_RTC_SWCOMP 0x108
26#define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000
27#define EP93XX_RTC_SWCOMP_DEL_SHIFT 16
28#define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff
29#define EP93XX_RTC_SWCOMP_INT_SHIFT 0
30
31#define DRV_VERSION "0.3"
32
33
34
35
36
37struct ep93xx_rtc {
38 void __iomem *mmio_base;
39 struct rtc_device *rtc;
40};
41
42static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
43 unsigned short *delete)
44{
45 struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
46 unsigned long comp;
47
48 comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
49
50 if (preload)
51 *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
52 >> EP93XX_RTC_SWCOMP_INT_SHIFT;
53
54 if (delete)
55 *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
56 >> EP93XX_RTC_SWCOMP_DEL_SHIFT;
57
58 return 0;
59}
60
61static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
62{
63 struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
64 unsigned long time;
65
66 time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
67
68 rtc_time_to_tm(time, tm);
69 return 0;
70}
71
72static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
73{
74 struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
75
76 __raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
77 return 0;
78}
79
80static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
81{
82 unsigned short preload, delete;
83
84 ep93xx_rtc_get_swcomp(dev, &preload, &delete);
85
86 seq_printf(seq, "preload\t\t: %d\n", preload);
87 seq_printf(seq, "delete\t\t: %d\n", delete);
88
89 return 0;
90}
91
92static const struct rtc_class_ops ep93xx_rtc_ops = {
93 .read_time = ep93xx_rtc_read_time,
94 .set_mmss = ep93xx_rtc_set_mmss,
95 .proc = ep93xx_rtc_proc,
96};
97
98static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
99 struct device_attribute *attr, char *buf)
100{
101 unsigned short preload;
102
103 ep93xx_rtc_get_swcomp(dev, &preload, NULL);
104
105 return sprintf(buf, "%d\n", preload);
106}
107static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
108
109static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
110 struct device_attribute *attr, char *buf)
111{
112 unsigned short delete;
113
114 ep93xx_rtc_get_swcomp(dev, NULL, &delete);
115
116 return sprintf(buf, "%d\n", delete);
117}
118static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
119
120static struct attribute *ep93xx_rtc_attrs[] = {
121 &dev_attr_comp_preload.attr,
122 &dev_attr_comp_delete.attr,
123 NULL
124};
125
126static const struct attribute_group ep93xx_rtc_sysfs_files = {
127 .attrs = ep93xx_rtc_attrs,
128};
129
130static int ep93xx_rtc_probe(struct platform_device *pdev)
131{
132 struct ep93xx_rtc *ep93xx_rtc;
133 struct resource *res;
134 int err;
135
136 ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
137 if (!ep93xx_rtc)
138 return -ENOMEM;
139
140 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
141 if (!res)
142 return -ENXIO;
143
144 if (!devm_request_mem_region(&pdev->dev, res->start,
145 resource_size(res), pdev->name))
146 return -EBUSY;
147
148 ep93xx_rtc->mmio_base = devm_ioremap(&pdev->dev, res->start,
149 resource_size(res));
150 if (!ep93xx_rtc->mmio_base)
151 return -ENXIO;
152
153 pdev->dev.platform_data = ep93xx_rtc;
154 platform_set_drvdata(pdev, ep93xx_rtc);
155
156 ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev,
157 pdev->name, &ep93xx_rtc_ops, THIS_MODULE);
158 if (IS_ERR(ep93xx_rtc->rtc)) {
159 err = PTR_ERR(ep93xx_rtc->rtc);
160 goto exit;
161 }
162
163 err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
164 if (err)
165 goto exit;
166
167 return 0;
168
169exit:
170 platform_set_drvdata(pdev, NULL);
171 pdev->dev.platform_data = NULL;
172 return err;
173}
174
175static int ep93xx_rtc_remove(struct platform_device *pdev)
176{
177 sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
178 platform_set_drvdata(pdev, NULL);
179 pdev->dev.platform_data = NULL;
180
181 return 0;
182}
183
184static struct platform_driver ep93xx_rtc_driver = {
185 .driver = {
186 .name = "ep93xx-rtc",
187 .owner = THIS_MODULE,
188 },
189 .probe = ep93xx_rtc_probe,
190 .remove = ep93xx_rtc_remove,
191};
192
193module_platform_driver(ep93xx_rtc_driver);
194
195MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
196MODULE_DESCRIPTION("EP93XX RTC driver");
197MODULE_LICENSE("GPL");
198MODULE_VERSION(DRV_VERSION);
199MODULE_ALIAS("platform:ep93xx-rtc");
200
