drm/ast: Implement register helpers in ast_drv.h

There are already a number of register I/O functions in ast_drv.h.
For consistency, move the remaining functions there as well. No
functional changes.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Jocelyn Falempe <jfalempe@redhat.com> # AST2600
Link: https://patchwork.freedesktop.org/patch/msgid/20230621130032.3568-4-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_drv.h

@@ -257,22 +257,36 @@ static inline void ast_io_write8(struct ast_device *ast, u32 reg, u8 val)
 	iowrite8(val, ast->ioregs + reg);
 }
 
-static inline void ast_set_index_reg(struct ast_device *ast,
-				     uint32_t base, uint8_t index,
-				     uint8_t val)
+static inline u8 ast_get_index_reg(struct ast_device *ast, u32 base, u8 index)
+{
+	ast_io_write8(ast, base, index);
+	++base;
+	return ast_io_read8(ast, base);
+}
+
+static inline u8 ast_get_index_reg_mask(struct ast_device *ast, u32 base, u8 index,
+					u8 preserve_mask)
+{
+	u8 val = ast_get_index_reg(ast, base, index);
+
+	return val & preserve_mask;
+}
+
+static inline void ast_set_index_reg(struct ast_device *ast, u32 base, u8 index, u8 val)
 {
 	ast_io_write8(ast, base, index);
 	++base;
 	ast_io_write8(ast, base, val);
 }
 
-void ast_set_index_reg_mask(struct ast_device *ast,
-			    uint32_t base, uint8_t index,
-			    uint8_t mask, uint8_t val);
-uint8_t ast_get_index_reg(struct ast_device *ast,
-			  uint32_t base, uint8_t index);
-uint8_t ast_get_index_reg_mask(struct ast_device *ast,
-			       uint32_t base, uint8_t index, uint8_t mask);
+static inline void ast_set_index_reg_mask(struct ast_device *ast, u32 base, u8 index,
+					  u8 preserve_mask, u8 val)
+{
+	u8 tmp = ast_get_index_reg_mask(ast, base, index, preserve_mask);
+
+	tmp |= val;
+	ast_set_index_reg(ast, base, index, tmp);
+}
 
 static inline void ast_open_key(struct ast_device *ast)
 {

drivers/gpu/drm/ast/ast_main.c

@@ -35,34 +35,6 @@
 
 #include "ast_drv.h"
 
-void ast_set_index_reg_mask(struct ast_device *ast,
-			    uint32_t base, uint8_t index,
-			    uint8_t mask, uint8_t val)
-{
-	u8 tmp;
-	ast_io_write8(ast, base, index);
-	tmp = (ast_io_read8(ast, base + 1) & mask) | val;
-	ast_set_index_reg(ast, base, index, tmp);
-}
-
-uint8_t ast_get_index_reg(struct ast_device *ast,
-			  uint32_t base, uint8_t index)
-{
-	uint8_t ret;
-	ast_io_write8(ast, base, index);
-	ret = ast_io_read8(ast, base + 1);
-	return ret;
-}
-
-uint8_t ast_get_index_reg_mask(struct ast_device *ast,
-			       uint32_t base, uint8_t index, uint8_t mask)
-{
-	uint8_t ret;
-	ast_io_write8(ast, base, index);
-	ret = ast_io_read8(ast, base + 1) & mask;
-	return ret;
-}
-
 static void ast_detect_config_mode(struct drm_device *dev, u32 *scu_rev)
 {
 	struct device_node *np = dev->dev->of_node;