powerpc/qixis: add clock measurement registers

QIXIS includes frequency measurement functions for each major processor
clock input. After reset (and after clocks are stable), QIXIS measures
the clocks against a reference frequency and stores the results in
CLK_FREQ registers. A base register supplies a multiplier which allows
directly obtaining the measured value, without requiring knowledge of
the target system or QIXIS core frequency.

Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

board/freescale/common/qixis.h

@@ -78,7 +78,11 @@ struct qixis {
 	u8 trig_stat;
 	u8 res12[3];
 	u8 trig_ctr[4];
-	u8 res13[48];
+	u8 res13[16];
+	u8 clk_freq[6];	/* Clock Measurement Registers */
+	u8 res_c6[8];
+	u8 clk_base[2];	/* Clock Frequency Base Reg */
+	u8 res_d0[16];
 	u8 aux2[4];	/* Auxiliary Registers,0xE0 */
 	u8 res14[10];
 	u8 aux_ad;