powerpc/85xx: Change timebase divisor to be defined per processor

Introduce new CONFIG_SYS_FSL_TBCLK_DIV on 85xx platforms because
different SoCs have different divisor amounts.  All the PQ3 parts are
/8, the P4080/P4080 is /16, and P2040/P3041/P5020 are /32.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

README

@@ -356,6 +356,13 @@ The following options need to be configured:
 		Define this option if you want to enable the
 		ICache only when Code runs from RAM.
 
+- 85xx CPU Options:
+		CONFIG_SYS_FSL_TBCLK_DIV
+
+		Defines the core time base clock divider ratio compared to the
+		system clock.  On most PQ3 devices this is 8, on newer QorIQ
+		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
+
 - Intel Monahans options:
 		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
 

arch/powerpc/cpu/mpc85xx/cpu.c

@@ -234,13 +234,14 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 /*
  * Get timebase clock frequency
  */
+#ifndef CONFIG_SYS_FSL_TBCLK_DIV
+#define CONFIG_SYS_FSL_TBCLK_DIV 8
+#endif
 unsigned long get_tbclk (void)
 {
-#ifdef CONFIG_FSL_CORENET
-	return (gd->bus_clk + 8) / 16;
-#else
-	return (gd->bus_clk + 4UL)/8UL;
-#endif
+	unsigned long tbclk_div = CONFIG_SYS_FSL_TBCLK_DIV;
+
+	return (gd->bus_clk + (tbclk_div >> 1)) / tbclk_div;
 }
 
 

arch/powerpc/include/asm/config_mpc85xx.h

@@ -264,6 +264,7 @@
 #define CONFIG_SYS_NUM_FM1_DTSEC	5
 #define CONFIG_NUM_DDR_CONTROLLERS	1
 #define CONFIG_SYS_FM_MURAM_SIZE	0x28000
+#define CONFIG_SYS_FSL_TBCLK_DIV	32
 #define CONFIG_SYS_FSL_USB1_PHY_ENABLE
 #define CONFIG_SYS_FSL_USB2_PHY_ENABLE
 #define CONFIG_SYS_FSL_ERRATUM_ESDHC111
@@ -278,6 +279,7 @@
 #define CONFIG_SYS_NUM_FM1_10GEC	1
 #define CONFIG_NUM_DDR_CONTROLLERS	1
 #define CONFIG_SYS_FM_MURAM_SIZE	0x28000
+#define CONFIG_SYS_FSL_TBCLK_DIV	32
 #define CONFIG_SYS_FSL_USB1_PHY_ENABLE
 #define CONFIG_SYS_FSL_USB2_PHY_ENABLE
 #define CONFIG_SYS_FSL_ERRATUM_ESDHC111
@@ -288,6 +290,7 @@
 #define CONFIG_SYS_FSL_NUM_LAWS		32
 #define CONFIG_SYS_FSL_SEC_COMPAT	4
 #define CONFIG_SYS_FM_MURAM_SIZE	0x28000
+#define CONFIG_SYS_FSL_TBCLK_DIV	16
 
 #elif defined(CONFIG_PPC_P4080)
 #define CONFIG_MAX_CPUS			8
@@ -301,6 +304,7 @@
 #define CONFIG_SYS_NUM_FM2_10GEC	1
 #define CONFIG_NUM_DDR_CONTROLLERS	2
 #define CONFIG_SYS_FM_MURAM_SIZE	0x28000
+#define CONFIG_SYS_FSL_TBCLK_DIV	16
 #define CONFIG_SYS_FSL_ERRATUM_CPC_A002
 #define CONFIG_SYS_FSL_ERRATUM_CPC_A003
 #define CONFIG_SYS_FSL_ERRATUM_DDR_A003
@@ -325,6 +329,7 @@
 #define CONFIG_SYS_NUM_FM1_10GEC	1
 #define CONFIG_NUM_DDR_CONTROLLERS	1
 #define CONFIG_SYS_FM_MURAM_SIZE	0x28000
+#define CONFIG_SYS_FSL_TBCLK_DIV	32
 #define CONFIG_SYS_FSL_USB1_PHY_ENABLE
 #define CONFIG_SYS_FSL_USB2_PHY_ENABLE
 #define CONFIG_SYS_FSL_ERRATUM_ESDHC111
@@ -339,6 +344,7 @@
 #define CONFIG_SYS_NUM_FM1_10GEC	1
 #define CONFIG_NUM_DDR_CONTROLLERS	2
 #define CONFIG_SYS_FM_MURAM_SIZE	0x28000
+#define CONFIG_SYS_FSL_TBCLK_DIV	32
 #define CONFIG_SYS_FSL_USB1_PHY_ENABLE
 #define CONFIG_SYS_FSL_USB2_PHY_ENABLE
 #define CONFIG_SYS_FSL_ERRATUM_ESDHC111