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Linux/drivers/rtc/rtc-ep93xx.c

  1 /*
  2  * A driver for the RTC embedded in the Cirrus Logic EP93XX processors
  3  * Copyright (c) 2006 Tower Technologies
  4  *
  5  * Author: Alessandro Zummo <a.zummo@towertech.it>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  */
 11 
 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 /*
 32  * struct device dev.platform_data is used to store our private data
 33  * because struct rtc_device does not have a variable to hold it.
 34  */
 35 struct ep93xx_rtc {
 36         void __iomem    *mmio_base;
 37         struct rtc_device *rtc;
 38 };
 39 
 40 static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
 41                                 unsigned short *delete)
 42 {
 43         struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
 44         unsigned long comp;
 45 
 46         comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
 47 
 48         if (preload)
 49                 *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
 50                                 >> EP93XX_RTC_SWCOMP_INT_SHIFT;
 51 
 52         if (delete)
 53                 *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
 54                                 >> EP93XX_RTC_SWCOMP_DEL_SHIFT;
 55 
 56         return 0;
 57 }
 58 
 59 static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
 60 {
 61         struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
 62         unsigned long time;
 63 
 64          time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
 65 
 66         rtc_time_to_tm(time, tm);
 67         return 0;
 68 }
 69 
 70 static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
 71 {
 72         struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
 73 
 74         writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
 75         return 0;
 76 }
 77 
 78 static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
 79 {
 80         unsigned short preload, delete;
 81 
 82         ep93xx_rtc_get_swcomp(dev, &preload, &delete);
 83 
 84         seq_printf(seq, "preload\t\t: %d\n", preload);
 85         seq_printf(seq, "delete\t\t: %d\n", delete);
 86 
 87         return 0;
 88 }
 89 
 90 static const struct rtc_class_ops ep93xx_rtc_ops = {
 91         .read_time      = ep93xx_rtc_read_time,
 92         .set_mmss       = ep93xx_rtc_set_mmss,
 93         .proc           = ep93xx_rtc_proc,
 94 };
 95 
 96 static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
 97                         struct device_attribute *attr, char *buf)
 98 {
 99         unsigned short preload;
100 
101         ep93xx_rtc_get_swcomp(dev, &preload, NULL);
102 
103         return sprintf(buf, "%d\n", preload);
104 }
105 static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
106 
107 static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
108                         struct device_attribute *attr, char *buf)
109 {
110         unsigned short delete;
111 
112         ep93xx_rtc_get_swcomp(dev, NULL, &delete);
113 
114         return sprintf(buf, "%d\n", delete);
115 }
116 static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
117 
118 static struct attribute *ep93xx_rtc_attrs[] = {
119         &dev_attr_comp_preload.attr,
120         &dev_attr_comp_delete.attr,
121         NULL
122 };
123 
124 static const struct attribute_group ep93xx_rtc_sysfs_files = {
125         .attrs  = ep93xx_rtc_attrs,
126 };
127 
128 static int ep93xx_rtc_probe(struct platform_device *pdev)
129 {
130         struct ep93xx_rtc *ep93xx_rtc;
131         struct resource *res;
132         int err;
133 
134         ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
135         if (!ep93xx_rtc)
136                 return -ENOMEM;
137 
138         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
139         ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res);
140         if (IS_ERR(ep93xx_rtc->mmio_base))
141                 return PTR_ERR(ep93xx_rtc->mmio_base);
142 
143         pdev->dev.platform_data = ep93xx_rtc;
144         platform_set_drvdata(pdev, ep93xx_rtc);
145 
146         ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev,
147                                 pdev->name, &ep93xx_rtc_ops, THIS_MODULE);
148         if (IS_ERR(ep93xx_rtc->rtc)) {
149                 err = PTR_ERR(ep93xx_rtc->rtc);
150                 goto exit;
151         }
152 
153         err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
154         if (err)
155                 goto exit;
156 
157         return 0;
158 
159 exit:
160         pdev->dev.platform_data = NULL;
161         return err;
162 }
163 
164 static int ep93xx_rtc_remove(struct platform_device *pdev)
165 {
166         sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
167         pdev->dev.platform_data = NULL;
168 
169         return 0;
170 }
171 
172 static struct platform_driver ep93xx_rtc_driver = {
173         .driver         = {
174                 .name   = "ep93xx-rtc",
175         },
176         .probe          = ep93xx_rtc_probe,
177         .remove         = ep93xx_rtc_remove,
178 };
179 
180 module_platform_driver(ep93xx_rtc_driver);
181 
182 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
183 MODULE_DESCRIPTION("EP93XX RTC driver");
184 MODULE_LICENSE("GPL");
185 MODULE_ALIAS("platform:ep93xx-rtc");
186 

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