LXR linux/arch/powerpc/sysdev/rtc_cmos

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