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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 #define DRV_VERSION "0.3"
 32 
 33 /*
 34  * struct device dev.platform_data is used to store our private data
 35  * because struct rtc_device does not have a variable to hold it.
 36  */
 37 struct ep93xx_rtc {
 38         void __iomem    *mmio_base;
 39         struct rtc_device *rtc;
 40 };
 41 
 42 static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
 43                                 unsigned short *delete)
 44 {
 45         struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
 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 
 61 static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
 62 {
 63         struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
 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 
 72 static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
 73 {
 74         struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
 75 
 76         __raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
 77         return 0;
 78 }
 79 
 80 static 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 
 92 static 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 
 98 static 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 }
107 static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
108 
109 static 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 }
118 static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
119 
120 static struct attribute *ep93xx_rtc_attrs[] = {
121         &dev_attr_comp_preload.attr,
122         &dev_attr_comp_delete.attr,
123         NULL
124 };
125 
126 static const struct attribute_group ep93xx_rtc_sysfs_files = {
127         .attrs  = ep93xx_rtc_attrs,
128 };
129 
130 static 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         ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res);
142         if (IS_ERR(ep93xx_rtc->mmio_base))
143                 return PTR_ERR(ep93xx_rtc->mmio_base);
144 
145         pdev->dev.platform_data = ep93xx_rtc;
146         platform_set_drvdata(pdev, ep93xx_rtc);
147 
148         ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev,
149                                 pdev->name, &ep93xx_rtc_ops, THIS_MODULE);
150         if (IS_ERR(ep93xx_rtc->rtc)) {
151                 err = PTR_ERR(ep93xx_rtc->rtc);
152                 goto exit;
153         }
154 
155         err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
156         if (err)
157                 goto exit;
158 
159         return 0;
160 
161 exit:
162         pdev->dev.platform_data = NULL;
163         return err;
164 }
165 
166 static int ep93xx_rtc_remove(struct platform_device *pdev)
167 {
168         sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
169         pdev->dev.platform_data = NULL;
170 
171         return 0;
172 }
173 
174 static struct platform_driver ep93xx_rtc_driver = {
175         .driver         = {
176                 .name   = "ep93xx-rtc",
177                 .owner  = THIS_MODULE,
178         },
179         .probe          = ep93xx_rtc_probe,
180         .remove         = ep93xx_rtc_remove,
181 };
182 
183 module_platform_driver(ep93xx_rtc_driver);
184 
185 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
186 MODULE_DESCRIPTION("EP93XX RTC driver");
187 MODULE_LICENSE("GPL");
188 MODULE_VERSION(DRV_VERSION);
189 MODULE_ALIAS("platform:ep93xx-rtc");
190 

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