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rtc_cmos_setup.c

/*
 * Setup code for PC-style Real-Time Clock.
 *
 * Author: Wade Farnsworth <wfarnsworth@mvista.com>
 *
 * 2007 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/mc146818rtc.h>

#include <asm/prom.h>

static int  __init add_rtc(void)
{
      struct device_node *np;
      struct platform_device *pd;
      struct resource res[2];
      unsigned int num_res = 1;
      int ret;

      memset(&res, 0, sizeof(res));

      np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
      if (!np)
            return -ENODEV;

      ret = of_address_to_resource(np, 0, &res[0]);
      of_node_put(np);
      if (ret)
            return ret;

      /*
       * RTC_PORT(x) is hardcoded in asm/mc146818rtc.h.  Verify that the
       * address provided by the device node matches.
       */
      if (res[0].start != RTC_PORT(0))
            return -EINVAL;

      np = of_find_compatible_node(NULL, NULL, "chrp,iic");
      if (!np)
            np = of_find_compatible_node(NULL, NULL, "pnpPNP,000");
      if (np) {
            of_node_put(np);
            /*
             * Use a fixed interrupt value of 8 since on PPC if we are
             * using this its off an i8259 which we ensure has interrupt
             * numbers 0..15.
             */
            res[1].start = 8;
            res[1].end = 8;
            res[1].flags = IORESOURCE_IRQ;
            num_res++;
      }

      pd = platform_device_register_simple("rtc_cmos", -1,
                                   &res[0], num_res);

      if (IS_ERR(pd))
            return PTR_ERR(pd);

      return 0;
}
fs_initcall(add_rtc);

MODULE_LICENSE("GPL");

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