[PATCH] char/rtc: Handle memory-mapped chips properly

Handle memory-mapped chips properly, needed for example on DECstations.
This support was in Linux 2.4 but for some reason got lost in 2.6. This
patch is taken directly from the linux-mips repository.

[[e-mail]: cleanup]
Signed-off-by: Maciej W. Rozycki <[e-mail]>
Signed-off-by: Martin Michlmayr <[e-mail]>
Cc: Paul Gortmaker <[e-mail]>
Cc: Ralf Baechle <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/char/rtc.c

···
  *      1.11a   Daniele Bellucci: Audit create_proc_read_entry in rtc_init
  *	1.12	Venkatesh Pallipadi: Hooks for emulating rtc on HPET base-timer
  *		CONFIG_HPET_EMULATE_RTC
+ *	1.12a	Maciej W. Rozycki: Handle memory-mapped chips properly.
  *	1.12ac	Alan Cox: Allow read access to the day of week register
  */
 
 #define RTC_VERSION		"1.12ac"
-
-#define RTC_IO_EXTENT	0x8
 
 /*
  *	Note that *all* calls to CMOS_READ and CMOS_WRITE are done with
···
 	if (rtc_has_irq == 0)
 		return -EIO;
 
-	if (count < sizeof(unsigned))
+	/*
+	 * Historically this function used to assume that sizeof(unsigned long)
+	 * is the same in userspace and kernelspace.  This lead to problems
+	 * for configurations with multiple ABIs such a the MIPS o32 and 64
+	 * ABIs supported on the same kernel.  So now we support read of both
+	 * 4 and 8 bytes and assume that's the sizeof(unsigned long) in the
+	 * userspace ABI.
+	 */
+	if (count != sizeof(unsigned int) && count !=  sizeof(unsigned long))
 		return -EINVAL;
 
 	add_wait_queue(&rtc_wait, &wait);
···
 		schedule();
 	} while (1);
 
-	if (count < sizeof(unsigned long))
-		retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int); 
+	if (count == sizeof(unsigned int))
+		retval = put_user(data, (unsigned int __user *)buf) ?: sizeof(int);
 	else
 		retval = put_user(data, (unsigned long __user *)buf) ?: sizeof(long);
+	if (!retval)
+		retval = count;
  out:
 	current->state = TASK_RUNNING;
 	remove_wait_queue(&rtc_wait, &wait);
···
 	struct sparc_isa_device *isa_dev;
 #endif
 #endif
+#ifndef __sparc__
+	void *r;
+#endif
 
 #ifdef __sparc__
 	for_each_ebus(ebus) {
···
 	}
 no_irq:
 #else
-	if (!request_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc")) {
-		printk(KERN_ERR "rtc: I/O port %d is not free.\n", RTC_PORT (0));
+	if (RTC_IOMAPPED)
+		r = request_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc");
+	else
+		r = request_mem_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc");
+	if (!r) {
+		printk(KERN_ERR "rtc: I/O resource %lx is not free.\n",
+		       (long)(RTC_PORT(0)));
 		return -EIO;
 	}
 
···
 	if(request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, "rtc", NULL)) {
 		/* Yeah right, seeing as irq 8 doesn't even hit the bus. */
 		printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ);
-		release_region(RTC_PORT(0), RTC_IO_EXTENT);
+		if (RTC_IOMAPPED)
+			release_region(RTC_PORT(0), RTC_IO_EXTENT);
+		else
+			release_mem_region(RTC_PORT(0), RTC_IO_EXTENT);
 		return -EIO;
 	}
 	hpet_rtc_timer_init();
···
 	if (rtc_has_irq)
 		free_irq (rtc_irq, &rtc_port);
 #else
-	release_region (RTC_PORT (0), RTC_IO_EXTENT);
+	if (RTC_IOMAPPED)
+		release_region(RTC_PORT(0), RTC_IO_EXTENT);
+	else
+		release_mem_region(RTC_PORT(0), RTC_IO_EXTENT);
 #ifdef RTC_IRQ
 	if (rtc_has_irq)
 		free_irq (RTC_IRQ, NULL);

include/asm-mips/mach-dec/mc146818rtc.h

···
 
 extern volatile u8 *dec_rtc_base;
 
+#define ARCH_RTC_LOCATION
+
 #define RTC_PORT(x)	CPHYSADDR((long)dec_rtc_base)
 #define RTC_IO_EXTENT	dec_kn_slot_size
 #define RTC_IOMAPPED	0

include/linux/mc146818rtc.h

···
 # define RTC_VRT 0x80		/* valid RAM and time */
 /**********************************************************************/
 
+#ifndef ARCH_RTC_LOCATION	/* Override by <asm/mc146818rtc.h>? */
+
+#define RTC_IO_EXTENT	0x8
+#define RTC_IOMAPPED	1	/* Default to I/O mapping. */
+
+#endif /* ARCH_RTC_LOCATION */
+
 #endif /* _MC146818RTC_H */