mpc8[56]xx: Put localbus clock in sysinfo and gd

Currently MPC85xx and MPC86xx boards just calculate the localbus frequency
and print it out, but don't save it.

This changes where its calculated and stored to be more consistent with the
CPU, CCB, TB, and DDR frequencies and the MPC83xx localbus clock.

The localbus frequency is added to sysinfo and calculated when sysinfo is
set up, in cpu/mpc8[56]xx/speed.c, the same as the other frequencies are.

get_clocks() copies the frequency into the global data, as the other
frequencies are, into a new field that is only enabled for MPC85xx and
MPC86xx.

checkcpu() in cpu/mpc8[56]xx/cpu.c will print out the local bus frequency
from sysinfo, like the other frequencies, instead of calculating it on the
spot.

Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Jon Loeliger <jdl@freescale.com>

7 files changed, 60 insertions, 44 deletions

diff --git a/cpu/mpc85xx/cpu.c b/cpu/mpc85xx/cpu.c
index 89800b8..15ba7f1 100644
--- a/cpu/mpc85xx/cpu.c
+++ b/cpu/mpc85xx/cpu.c
@@ -77,8 +77,6 @@ struct cpu_type *identify_cpu(u32 ver)
 int checkcpu (void)
 {
 	sys_info_t sysinfo;
-	uint lcrr;		/* local bus clock ratio register */
-	uint clkdiv;		/* clock divider portion of lcrr */
 	uint pvr, svr;
 	uint fam;
 	uint ver;
@@ -165,30 +163,11 @@ int checkcpu (void)
 		break;
 	}
 
-#if defined(CONFIG_SYS_LBC_LCRR)
-	lcrr = CONFIG_SYS_LBC_LCRR;
-#else
-	{
-	    volatile ccsr_lbc_t *lbc = (void *)(CONFIG_SYS_MPC85xx_LBC_ADDR);
-
-	    lcrr = lbc->lcrr;
-	}
-#endif
-	clkdiv = lcrr & LCRR_CLKDIV;
-	if (clkdiv == 2 || clkdiv == 4 || clkdiv == 8) {
-#if !defined(CONFIG_MPC8540) && !defined(CONFIG_MPC8541) && \
-    !defined(CONFIG_MPC8555) && !defined(CONFIG_MPC8560)
-		/*
-		 * Yes, the entire PQ38 family use the same
-		 * bit-representation for twice the clock divider values.
-		 */
-		 clkdiv *= 2;
-#endif
-		printf("LBC:%-4s MHz\n",
-		       strmhz(buf1, sysinfo.freqSystemBus / clkdiv));
-	} else {
-		printf("LBC: unknown (lcrr: 0x%08x)\n", lcrr);
-	}
+	if (sysinfo.freqLocalBus > LCRR_CLKDIV)
+		printf("LBC:%-4s MHz\n", strmhz(buf1, sysinfo.freqLocalBus));
+	else
+		printf("LBC: unknown (LCRR[CLKDIV] = 0x%02lx)\n",
+		       sysinfo.freqLocalBus);
 
 #ifdef CONFIG_CPM2
 	printf("CPM:   %s MHz\n", strmhz(buf1, sysinfo.freqSystemBus));
diff --git a/cpu/mpc85xx/speed.c b/cpu/mpc85xx/speed.c
index 1e0f483..0d55228 100644
--- a/cpu/mpc85xx/speed.c
+++ b/cpu/mpc85xx/speed.c
@@ -28,6 +28,7 @@
 #include <common.h>
 #include <ppc_asm.tmpl>
 #include <asm/processor.h>
+#include <asm/io.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -37,6 +38,7 @@ void get_sys_info (sys_info_t * sysInfo)
 {
 	volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
 	uint plat_ratio,e500_ratio,half_freqSystemBus;
+	uint lcrr_div;
 
 	plat_ratio = (gur->porpllsr) & 0x0000003e;
 	plat_ratio >>= 1;
@@ -60,6 +62,30 @@ void get_sys_info (sys_info_t * sysInfo)
 			sysInfo->freqDDRBus = ddr_ratio * CONFIG_DDR_CLK_FREQ;
 	}
 #endif
+
+#if defined(CONFIG_SYS_LBC_LCRR)
+	/* We will program LCRR to this value later */
+	lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV;
+#else
+	{
+	    volatile ccsr_lbc_t *lbc = (void *)(CONFIG_SYS_MPC85xx_LBC_ADDR);
+	    lcrr_div = in_be32(&lbc->lcrr) & LCRR_CLKDIV;
+	}
+#endif
+	if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
+#if !defined(CONFIG_MPC8540) && !defined(CONFIG_MPC8541) && \
+    !defined(CONFIG_MPC8555) && !defined(CONFIG_MPC8560)
+		/*
+		 * Yes, the entire PQ38 family use the same
+		 * bit-representation for twice the clock divider values.
+		 */
+		lcrr_div *= 2;
+#endif
+		sysInfo->freqLocalBus = sysInfo->freqSystemBus / lcrr_div;
+	} else {
+		/* In case anyone cares what the unknown value is */
+		sysInfo->freqLocalBus = lcrr_div;
+	}
 }
 
 
@@ -82,6 +108,7 @@ int get_clocks (void)
 	gd->cpu_clk = sys_info.freqProcessor;
 	gd->bus_clk = sys_info.freqSystemBus;
 	gd->mem_clk = sys_info.freqDDRBus;
+	gd->lbc_clk = sys_info.freqLocalBus;
 
 	/*
 	 * The base clock for I2C depends on the actual SOC.  Unfortunately,
diff --git a/cpu/mpc86xx/cpu.c b/cpu/mpc86xx/cpu.c
index a179fb3..3568023 100644
--- a/cpu/mpc86xx/cpu.c
+++ b/cpu/mpc86xx/cpu.c
@@ -39,8 +39,6 @@ checkcpu(void)
 	uint pvr, svr;
 	uint ver;
 	uint major, minor;
-	uint lcrr;		/* local bus clock ratio register */
-	uint clkdiv;		/* clock divider portion of lcrr */
 	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 	volatile ccsr_gur_t *gur = &immap->im_gur;
 
@@ -100,23 +98,11 @@ checkcpu(void)
 	printf("MPX:%4lu MHz, ", sysinfo.freqSystemBus / 1000000);
 	printf("DDR:%4lu MHz, ", sysinfo.freqSystemBus / 2000000);
 
-#if defined(CONFIG_SYS_LBC_LCRR)
-	lcrr = CONFIG_SYS_LBC_LCRR;
-#else
-	{
-		volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
-		volatile ccsr_lbc_t *lbc = &immap->im_lbc;
-
-		lcrr = lbc->lcrr;
-	}
-#endif
-	clkdiv = lcrr & LCRR_CLKDIV;
-	if (clkdiv == 2 || clkdiv == 4 || clkdiv == 8) {
-		clkdiv *= 2;
-		printf("LBC:%4lu MHz\n",
-		       sysinfo.freqSystemBus / 1000000 / clkdiv);
+	if (sysinfo.freqLocalBus > LCRR_CLKDIV) {
+		printf("LBC:%4lu MHz\n", sysinfo.freqLocalBus / 1000000);
 	} else {
-		printf("    LBC: unknown (lcrr: 0x%08x)\n", lcrr);
+		printf("LBC: unknown (LCRR[CLKDIV] = 0x%02x)\n",
+		       sysinfo.freqLocalBus);
 	}
 
 	puts("    L2: ");
diff --git a/cpu/mpc86xx/speed.c b/cpu/mpc86xx/speed.c
index 415ac9d..64a3479 100644
--- a/cpu/mpc86xx/speed.c
+++ b/cpu/mpc86xx/speed.c
@@ -28,6 +28,7 @@
 #include <common.h>
 #include <mpc86xx.h>
 #include <asm/processor.h>
+#include <asm/io.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -39,6 +40,7 @@ void get_sys_info(sys_info_t *sysInfo)
 	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 	volatile ccsr_gur_t *gur = &immap->im_gur;
 	uint plat_ratio, e600_ratio;
+	uint lcrr_div;
 
 	plat_ratio = (gur->porpllsr) & 0x0000003e;
 	plat_ratio >>= 1;
@@ -90,6 +92,22 @@ void get_sys_info(sys_info_t *sysInfo)
 		sysInfo->freqProcessor = e600_ratio + sysInfo->freqSystemBus;
 		break;
 	}
+
+#if defined(CONFIG_SYS_LBC_LCRR)
+	/* We will program LCRR to this value later */
+	lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV;
+#else
+	{
+		volatile ccsr_lbc_t *lbc = &immap->im_lbc;
+		lcrr_div = in_be32(&lbc->lcrr) & LCRR_CLKDIV;
+	}
+#endif
+	if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) {
+		sysInfo->freqLocalBus = sysInfo->freqSystemBus / (lcrr_div * 2);
+	} else {
+		/* In case anyone cares what the unknown value is */
+		sysInfo->freqLocalBus = lcrr_div;
+	}
 }
 
 
@@ -105,6 +123,7 @@ int get_clocks(void)
 	get_sys_info(&sys_info);
 	gd->cpu_clk = sys_info.freqProcessor;
 	gd->bus_clk = sys_info.freqSystemBus;
+	gd->lbc_clk = sys_info.freqLocalBus;
 
 	/*
 	 * The base clock for I2C depends on the actual SOC.  Unfortunately,
diff --git a/include/asm-ppc/global_data.h b/include/asm-ppc/global_data.h
index aade097..2bb50b4 100644
--- a/include/asm-ppc/global_data.h
+++ b/include/asm-ppc/global_data.h
@@ -89,6 +89,9 @@ typedef	struct	global_data {
 #if defined(CONFIG_MPC837X) || defined(CONFIG_MPC8536)
 	u32 sdhc_clk;
 #endif
+#if defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
+	u32 lbc_clk;
+#endif /* CONFIG_MPC85xx || CONFIG_MPC86xx */
 #if defined(CONFIG_MPC83XX) || defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
 	u32 i2c1_clk;
 	u32 i2c2_clk;
diff --git a/include/e500.h b/include/e500.h
index 1971eee..9d3c841 100644
--- a/include/e500.h
+++ b/include/e500.h
@@ -13,6 +13,7 @@ typedef struct
   unsigned long freqProcessor;
   unsigned long freqSystemBus;
   unsigned long freqDDRBus;
+  unsigned long freqLocalBus;
 } MPC85xx_SYS_INFO;
 
 #endif  /* _ASMLANGUAGE */
diff --git a/include/mpc86xx.h b/include/mpc86xx.h
index f119d5b..a6fdea3 100644
--- a/include/mpc86xx.h
+++ b/include/mpc86xx.h
@@ -84,6 +84,7 @@
 typedef struct {
 	unsigned long freqProcessor;
 	unsigned long freqSystemBus;
+	unsigned long freqLocalBus;
 } MPC86xx_SYS_INFO;
 
 #define l1icache_enable	icache_enable