Commit defb45147b85457461bfd3e57f0ecc05c18c429e
Committed by
Linus Torvalds
1 parent
97a1f9532e
Exists in
master
and in
7 other branches
rtc: driver for Marvell's SoCs 88F6281 and 88F6192
Driver for the on-chip RTC found in some of Marvell's SoCs such as the Kirkwood 88F6281 and 88F6192 devices. Signed-off-by: Saeed Bishara <saeed@marvell.com> Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Showing 3 changed files with 175 additions and 0 deletions Side-by-side Diff
drivers/rtc/Kconfig
... | ... | @@ -712,5 +712,16 @@ |
712 | 712 | Driver for the internal RTC (Realtime Clock) module found on |
713 | 713 | Toshiba TX4939 SoC. |
714 | 714 | |
715 | +config RTC_DRV_MV | |
716 | + tristate "Marvell SoC RTC" | |
717 | + depends on ARCH_KIRKWOOD | |
718 | + help | |
719 | + If you say yes here you will get support for the in-chip RTC | |
720 | + that can be found in some of Marvell's SoC devices, such as | |
721 | + the Kirkwood 88F6281 and 88F6192. | |
722 | + | |
723 | + This driver can also be built as a module. If so, the module | |
724 | + will be called rtc-mv. | |
725 | + | |
715 | 726 | endif # RTC_CLASS |
drivers/rtc/Makefile
... | ... | @@ -48,6 +48,7 @@ |
48 | 48 | obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o |
49 | 49 | obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o |
50 | 50 | obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o |
51 | +obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o | |
51 | 52 | obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o |
52 | 53 | obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o |
53 | 54 | obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o |
drivers/rtc/rtc-mv.c
1 | +/* | |
2 | + * Driver for the RTC in Marvell SoCs. | |
3 | + * | |
4 | + * This file is licensed under the terms of the GNU General Public | |
5 | + * License version 2. This program is licensed "as is" without any | |
6 | + * warranty of any kind, whether express or implied. | |
7 | + */ | |
8 | + | |
9 | +#include <linux/init.h> | |
10 | +#include <linux/kernel.h> | |
11 | +#include <linux/rtc.h> | |
12 | +#include <linux/bcd.h> | |
13 | +#include <linux/io.h> | |
14 | +#include <linux/platform_device.h> | |
15 | + | |
16 | + | |
17 | +#define RTC_TIME_REG_OFFS 0 | |
18 | +#define RTC_SECONDS_OFFS 0 | |
19 | +#define RTC_MINUTES_OFFS 8 | |
20 | +#define RTC_HOURS_OFFS 16 | |
21 | +#define RTC_WDAY_OFFS 24 | |
22 | +#define RTC_HOURS_12H_MODE (1 << 22) /* 12 hours mode */ | |
23 | + | |
24 | +#define RTC_DATE_REG_OFFS 4 | |
25 | +#define RTC_MDAY_OFFS 0 | |
26 | +#define RTC_MONTH_OFFS 8 | |
27 | +#define RTC_YEAR_OFFS 16 | |
28 | + | |
29 | + | |
30 | +struct rtc_plat_data { | |
31 | + struct rtc_device *rtc; | |
32 | + void __iomem *ioaddr; | |
33 | +}; | |
34 | + | |
35 | +static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
36 | +{ | |
37 | + struct rtc_plat_data *pdata = dev_get_drvdata(dev); | |
38 | + void __iomem *ioaddr = pdata->ioaddr; | |
39 | + u32 rtc_reg; | |
40 | + | |
41 | + rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) | | |
42 | + (bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) | | |
43 | + (bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) | | |
44 | + (bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS); | |
45 | + writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS); | |
46 | + | |
47 | + rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) | | |
48 | + (bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) | | |
49 | + (bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS); | |
50 | + writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS); | |
51 | + | |
52 | + return 0; | |
53 | +} | |
54 | + | |
55 | +static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
56 | +{ | |
57 | + struct rtc_plat_data *pdata = dev_get_drvdata(dev); | |
58 | + void __iomem *ioaddr = pdata->ioaddr; | |
59 | + u32 rtc_time, rtc_date; | |
60 | + unsigned int year, month, day, hour, minute, second, wday; | |
61 | + | |
62 | + rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS); | |
63 | + rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS); | |
64 | + | |
65 | + second = rtc_time & 0x7f; | |
66 | + minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f; | |
67 | + hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */ | |
68 | + wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7; | |
69 | + | |
70 | + day = rtc_date & 0x3f; | |
71 | + month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f; | |
72 | + year = (rtc_date >> RTC_YEAR_OFFS) & 0xff; | |
73 | + | |
74 | + tm->tm_sec = bcd2bin(second); | |
75 | + tm->tm_min = bcd2bin(minute); | |
76 | + tm->tm_hour = bcd2bin(hour); | |
77 | + tm->tm_mday = bcd2bin(day); | |
78 | + tm->tm_wday = bcd2bin(wday); | |
79 | + tm->tm_mon = bcd2bin(month) - 1; | |
80 | + /* hw counts from year 2000, but tm_year is relative to 1900 */ | |
81 | + tm->tm_year = bcd2bin(year) + 100; | |
82 | + | |
83 | + return rtc_valid_tm(tm); | |
84 | +} | |
85 | + | |
86 | +static const struct rtc_class_ops mv_rtc_ops = { | |
87 | + .read_time = mv_rtc_read_time, | |
88 | + .set_time = mv_rtc_set_time, | |
89 | +}; | |
90 | + | |
91 | +static int __init mv_rtc_probe(struct platform_device *pdev) | |
92 | +{ | |
93 | + struct resource *res; | |
94 | + struct rtc_plat_data *pdata; | |
95 | + resource_size_t size; | |
96 | + u32 rtc_time; | |
97 | + | |
98 | + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
99 | + if (!res) | |
100 | + return -ENODEV; | |
101 | + | |
102 | + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
103 | + if (!pdata) | |
104 | + return -ENOMEM; | |
105 | + | |
106 | + size = resource_size(res); | |
107 | + if (!devm_request_mem_region(&pdev->dev, res->start, size, | |
108 | + pdev->name)) | |
109 | + return -EBUSY; | |
110 | + | |
111 | + pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size); | |
112 | + if (!pdata->ioaddr) | |
113 | + return -ENOMEM; | |
114 | + | |
115 | + /* make sure the 24 hours mode is enabled */ | |
116 | + rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS); | |
117 | + if (rtc_time & RTC_HOURS_12H_MODE) { | |
118 | + dev_err(&pdev->dev, "24 Hours mode not supported.\n"); | |
119 | + return -EINVAL; | |
120 | + } | |
121 | + | |
122 | + platform_set_drvdata(pdev, pdata); | |
123 | + pdata->rtc = rtc_device_register(pdev->name, &pdev->dev, | |
124 | + &mv_rtc_ops, THIS_MODULE); | |
125 | + if (IS_ERR(pdata->rtc)) | |
126 | + return PTR_ERR(pdata->rtc); | |
127 | + | |
128 | + return 0; | |
129 | +} | |
130 | + | |
131 | +static int __exit mv_rtc_remove(struct platform_device *pdev) | |
132 | +{ | |
133 | + struct rtc_plat_data *pdata = platform_get_drvdata(pdev); | |
134 | + | |
135 | + rtc_device_unregister(pdata->rtc); | |
136 | + return 0; | |
137 | +} | |
138 | + | |
139 | +static struct platform_driver mv_rtc_driver = { | |
140 | + .remove = __exit_p(mv_rtc_remove), | |
141 | + .driver = { | |
142 | + .name = "rtc-mv", | |
143 | + .owner = THIS_MODULE, | |
144 | + }, | |
145 | +}; | |
146 | + | |
147 | +static __init int mv_init(void) | |
148 | +{ | |
149 | + return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe); | |
150 | +} | |
151 | + | |
152 | +static __exit void mv_exit(void) | |
153 | +{ | |
154 | + platform_driver_unregister(&mv_rtc_driver); | |
155 | +} | |
156 | + | |
157 | +module_init(mv_init); | |
158 | +module_exit(mv_exit); | |
159 | + | |
160 | +MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>"); | |
161 | +MODULE_DESCRIPTION("Marvell RTC driver"); | |
162 | +MODULE_LICENSE("GPL"); | |
163 | +MODULE_ALIAS("platform:rtc-mv"); |