staging: sm750fb: change definition of CURRENT_GATE multi-bit fields

Use more straight-forward definitions for multi-bit fields of
CURRENT_GATE register and use open-coded implementation for register
manipulation.
Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/ddk750_chip.c

@@ -95,20 +95,20 @@ static void setMemoryClock(unsigned int frequency)
 		divisor = roundedDiv(get_mxclk_freq(), frequency);
 
 		/* Set the corresponding divisor in the register. */
-		reg = PEEK32(CURRENT_GATE);
+		reg = PEEK32(CURRENT_GATE) & ~CURRENT_GATE_M2XCLK_MASK;
 		switch (divisor) {
 		default:
 		case 1:
-			reg = FIELD_SET(reg, CURRENT_GATE, M2XCLK, DIV_1);
+			reg |= CURRENT_GATE_M2XCLK_DIV_1;
 			break;
 		case 2:
-			reg = FIELD_SET(reg, CURRENT_GATE, M2XCLK, DIV_2);
+			reg |= CURRENT_GATE_M2XCLK_DIV_2;
 			break;
 		case 3:
-			reg = FIELD_SET(reg, CURRENT_GATE, M2XCLK, DIV_3);
+			reg |= CURRENT_GATE_M2XCLK_DIV_3;
 			break;
 		case 4:
-			reg = FIELD_SET(reg, CURRENT_GATE, M2XCLK, DIV_4);
+			reg |= CURRENT_GATE_M2XCLK_DIV_4;
 			break;
 		}
 
@@ -142,20 +142,20 @@ static void setMasterClock(unsigned int frequency)
 		divisor = roundedDiv(get_mxclk_freq(), frequency);
 
 		/* Set the corresponding divisor in the register. */
-		reg = PEEK32(CURRENT_GATE);
+		reg = PEEK32(CURRENT_GATE) & ~CURRENT_GATE_MCLK_MASK;
 		switch (divisor) {
 		default:
 		case 3:
-			reg = FIELD_SET(reg, CURRENT_GATE, MCLK, DIV_3);
+			reg |= CURRENT_GATE_MCLK_DIV_3;
 			break;
 		case 4:
-			reg = FIELD_SET(reg, CURRENT_GATE, MCLK, DIV_4);
+			reg |= CURRENT_GATE_MCLK_DIV_4;
 			break;
 		case 6:
-			reg = FIELD_SET(reg, CURRENT_GATE, MCLK, DIV_6);
+			reg |= CURRENT_GATE_MCLK_DIV_6;
 			break;
 		case 8:
-			reg = FIELD_SET(reg, CURRENT_GATE, MCLK, DIV_8);
+			reg |= CURRENT_GATE_MCLK_DIV_8;
 			break;
 		}
 

drivers/staging/sm750fb/ddk750_reg.h

@@ -391,29 +391,29 @@
 #define INT_MASK_VGA_VSYNC_ENABLE                     1
 
 #define CURRENT_GATE                                  0x000040
-#define CURRENT_GATE_MCLK                             15:14
+#define CURRENT_GATE_MCLK_MASK                        (0x3 << 14)
 #ifdef VALIDATION_CHIP
-    #define CURRENT_GATE_MCLK_112MHZ                      0
-    #define CURRENT_GATE_MCLK_84MHZ                       1
-    #define CURRENT_GATE_MCLK_56MHZ                       2
-    #define CURRENT_GATE_MCLK_42MHZ                       3
+    #define CURRENT_GATE_MCLK_112MHZ                  (0x0 << 14)
+    #define CURRENT_GATE_MCLK_84MHZ                   (0x1 << 14)
+    #define CURRENT_GATE_MCLK_56MHZ                   (0x2 << 14)
+    #define CURRENT_GATE_MCLK_42MHZ                   (0x3 << 14)
 #else
-    #define CURRENT_GATE_MCLK_DIV_3                       0
-    #define CURRENT_GATE_MCLK_DIV_4                       1
-    #define CURRENT_GATE_MCLK_DIV_6                       2
-    #define CURRENT_GATE_MCLK_DIV_8                       3
+    #define CURRENT_GATE_MCLK_DIV_3                   (0x0 << 14)
+    #define CURRENT_GATE_MCLK_DIV_4                   (0x1 << 14)
+    #define CURRENT_GATE_MCLK_DIV_6                   (0x2 << 14)
+    #define CURRENT_GATE_MCLK_DIV_8                   (0x3 << 14)
 #endif
-#define CURRENT_GATE_M2XCLK                           13:12
+#define CURRENT_GATE_M2XCLK_MASK                      (0x3 << 12)
 #ifdef VALIDATION_CHIP
-    #define CURRENT_GATE_M2XCLK_336MHZ                    0
-    #define CURRENT_GATE_M2XCLK_168MHZ                    1
-    #define CURRENT_GATE_M2XCLK_112MHZ                    2
-    #define CURRENT_GATE_M2XCLK_84MHZ                     3
+    #define CURRENT_GATE_M2XCLK_336MHZ                (0x0 << 12)
+    #define CURRENT_GATE_M2XCLK_168MHZ                (0x1 << 12)
+    #define CURRENT_GATE_M2XCLK_112MHZ                (0x2 << 12)
+    #define CURRENT_GATE_M2XCLK_84MHZ                 (0x3 << 12)
 #else
-    #define CURRENT_GATE_M2XCLK_DIV_1                     0
-    #define CURRENT_GATE_M2XCLK_DIV_2                     1
-    #define CURRENT_GATE_M2XCLK_DIV_3                     2
-    #define CURRENT_GATE_M2XCLK_DIV_4                     3
+    #define CURRENT_GATE_M2XCLK_DIV_1                 (0x0 << 12)
+    #define CURRENT_GATE_M2XCLK_DIV_2                 (0x1 << 12)
+    #define CURRENT_GATE_M2XCLK_DIV_3                 (0x2 << 12)
+    #define CURRENT_GATE_M2XCLK_DIV_4                 (0x3 << 12)
 #endif
 #define CURRENT_GATE_VGA                              BIT(10)
 #define CURRENT_GATE_PWM                              BIT(9)