ata: pata_ep93xx: avoid asm on non ARM

The raw ARM asm delay loop prevents COMPILE_TEST builds on
non-ARM architectures. Guard it with CONFIG_ARM and provide a
cpu_relax() fallback for compilation on other architectures.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Niklas Cassel <cassel@kernel.org>

Author: neheb

drivers/ata/pata_ep93xx.c

@@ -204,6 +204,7 @@ static void ep93xx_pata_enable_pio(void __iomem *base, int pio_mode)
  */
 static void ep93xx_pata_delay(unsigned long count)
 {
+#ifdef CONFIG_ARM
 	__asm__ volatile (
 		"0:\n"
 		"mov r0, r0\n"
@@ -212,6 +213,10 @@ static void ep93xx_pata_delay(unsigned long count)
 		: "=r" (count)
 		: "0" (count)
 	);
+#else
+	while (count--)
+		cpu_relax();
+#endif
 }
 
 static unsigned long ep93xx_pata_wait_for_iordy(void __iomem *base,