| 1 | |
| 2 | * Setup code for PC-style Real-Time Clock.
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| 3 | *
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| 4 | * Author: Wade Farnsworth <[email protected]>
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| 5 | *
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| 6 | * 2007 (c) MontaVista Software, Inc. This file is licensed under
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| 7 | * the terms of the GNU General Public License version 2. This program
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| 8 | * is licensed "as is" without any warranty of any kind, whether express
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| 9 | * or implied.
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| 10 |
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| 11 |
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| 12 | #include <linux/platform_device.h>
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| 13 | #include <linux/err.h>
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| 14 | #include <linux/init.h>
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| 15 | #include <linux/module.h>
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| 16 | #include <linux/mc146818rtc.h>
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| 17 | #include <linux/of_address.h>
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| 18 |
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| 19 |
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| 20 | static int __init add_rtc(void)
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| 21 | {
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| 22 | struct device_node *np;
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| 23 | struct platform_device *pd;
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| 24 | struct resource res[2];
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| 25 | unsigned int num_res = 1;
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| 26 | int ret;
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| 27 |
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| 28 | memset(&res, 0, sizeof(res));
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| 29 |
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| 30 | np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
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| 31 | if (!np)
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| 32 | return -ENODEV;
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| 33 |
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| 34 | ret = of_address_to_resource(np, 0, &res[0]);
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| 35 | of_node_put(np);
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| 36 | if (ret)
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| 37 | return ret;
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| 38 |
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| 39 | |
| 40 | * RTC_PORT(x) is hardcoded in asm/mc146818rtc.h. Verify that the
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| 41 | * address provided by the device node matches.
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| 42 |
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| 43 | if (res[0].start != RTC_PORT(0))
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| 44 | return -EINVAL;
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| 45 |
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| 46 | np = of_find_compatible_node(NULL, NULL, "chrp,iic");
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| 47 | if (!np)
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| 48 | np = of_find_compatible_node(NULL, NULL, "pnpPNP,000");
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| 49 | if (np) {
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| 50 | of_node_put(np);
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| 51 | |
| 52 | * Use a fixed interrupt value of 8 since on PPC if we are
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| 53 | * using this its off an i8259 which we ensure has interrupt
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| 54 | * numbers 0..15.
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| 55 |
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| 56 | res[1].start = 8;
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| 57 | res[1].end = 8;
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| 58 | res[1].flags = IORESOURCE_IRQ;
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| 59 | num_res++;
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| 60 | }
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| 61 |
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| 62 | pd = platform_device_register_simple("rtc_cmos", -1,
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| 63 | &res[0], num_res);
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| 64 |
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| 65 | return PTR_ERR_OR_ZERO(pd);
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| 66 | }
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| 67 | fs_initcall(add_rtc);
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| 68 |
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| 69 | MODULE_DESCRIPTION("PPC RTC CMOS driver");
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| 70 | MODULE_LICENSE("GPL");
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