sticon/parisc: Allow 64-bit STI calls in PDC firmware abstration

Some 64-bit machines require us to call the STI ROM in 64-bit mode, e.g.
with the VisFXe graphic card.
This patch allows drivers to use such 64-bit calling conventions.
Tested-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/pdc.h

@@ -88,8 +88,8 @@ int pdc_iodc_print(const unsigned char *str, unsigned count);
 
 void pdc_emergency_unlock(void);
 int pdc_sti_call(unsigned long func, unsigned long flags,
-                 unsigned long inptr, unsigned long outputr,
-                 unsigned long glob_cfg);
+		unsigned long inptr, unsigned long outputr,
+		unsigned long glob_cfg, int do_call64);
 
 int __pdc_cpu_rendezvous(void);
 void pdc_cpu_rendezvous_lock(void);

arch/parisc/kernel/firmware.c

@@ -1389,17 +1389,25 @@ int pdc_iodc_getc(void)
 }
 
 int pdc_sti_call(unsigned long func, unsigned long flags,
-                 unsigned long inptr, unsigned long outputr,
-                 unsigned long glob_cfg)
+		unsigned long inptr, unsigned long outputr,
+		unsigned long glob_cfg, int do_call64)
 {
-        int retval;
+	int retval = 0;
 	unsigned long irqflags;
 
-        spin_lock_irqsave(&pdc_lock, irqflags);  
-        retval = real32_call(func, flags, inptr, outputr, glob_cfg);
-        spin_unlock_irqrestore(&pdc_lock, irqflags);
+	spin_lock_irqsave(&pdc_lock, irqflags);
+	if (IS_ENABLED(CONFIG_64BIT) && do_call64) {
+#ifdef CONFIG_64BIT
+		retval = real64_call(func, flags, inptr, outputr, glob_cfg);
+#else
+		WARN_ON(1);
+#endif
+	} else {
+		retval = real32_call(func, flags, inptr, outputr, glob_cfg);
+	}
+	spin_unlock_irqrestore(&pdc_lock, irqflags);
 
-        return retval;
+	return retval;
 }
 EXPORT_SYMBOL(pdc_sti_call);
 

drivers/video/sticore.c

@@ -1142,7 +1142,7 @@ int sti_call(const struct sti_struct *sti, unsigned long func,
 		return -1;
 #endif
 
-	ret = pdc_sti_call(func, _flags, _inptr, _outptr, _glob_cfg);
+	ret = pdc_sti_call(func, _flags, _inptr, _outptr, _glob_cfg, 0);
 
 	return ret;
 }