device/azalia_device.c: Add codec reset helpers

Many uses of `azalia_set_bits` are used to toggle the reset bit. To
avoid having to repeat the register operations and the corresponding
comment, create two helpers with self-explanatory names. They will be
put to use in subsequent commits, with one change for each function.

Change-Id: If0594fdaf99319f08a2e272cd37958f0f216e654
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48355
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/device/azalia_device.c

@@ -34,6 +34,18 @@ int azalia_set_bits(void *port, u32 mask, u32 val)
 	return 0;
 }
 
+int azalia_enter_reset(u8 *base)
+{
+	/* Set bit 0 to 0 to enter reset state (BAR + 0x8)[0] */
+	return azalia_set_bits(base + HDA_GCTL_REG, HDA_GCTL_CRST, 0);
+}
+
+int azalia_exit_reset(u8 *base)
+{
+	/* Set bit 0 to 1 to exit reset state (BAR + 0x8)[0] */
+	return azalia_set_bits(base + HDA_GCTL_REG, HDA_GCTL_CRST, HDA_GCTL_CRST);
+}
+
 static int codec_detect(u8 *base)
 {
 	u32 reg32;