ppc4xx: Add function to check and dynamically change PCI sync clock

PPC440EP(x)/PPC440GR(x):
In asynchronous PCI mode, the synchronous PCI clock must meet
certain requirements. The following equation describes the
relationship that must be maintained between the asynchronous PCI
clock and synchronous PCI clock. Select an appropriate PCI:PLB
ratio to maintain the relationship:

AsyncPCIClk - 1MHz <= SyncPCIclock <= (2 * AsyncPCIClk) - 1MHz

This patch now adds a function to check and reconfigure the sync
PCI clock to meet this requirement. This is in preparation for
some AMCC boards (Sequoia/Rainier and Yosemite/Yellowstone) using this
function to not violate the PCI clocking rules.

Signed-off-by: Stefan Roese <sr@denx.de>

cpu/ppc4xx/cpu_init.c

@@ -330,3 +330,72 @@ int cpu_init_r (void)
 
 	return 0;
 }
+
+#if defined(CONFIG_PCI) && \
+	(defined(CONFIG_440EP) || defined(CONFIG_440EPX) || \
+	 defined(CONFIG_440GR) || defined(CONFIG_440GRX))
+/*
+ * 440EP(x)/GR(x) PCI async/sync clocking restriction:
+ *
+ * In asynchronous PCI mode, the synchronous PCI clock must meet
+ * certain requirements. The following equation describes the
+ * relationship that must be maintained between the asynchronous PCI
+ * clock and synchronous PCI clock. Select an appropriate PCI:PLB
+ * ratio to maintain the relationship:
+ *
+ * AsyncPCIClk - 1MHz <= SyncPCIclock <= (2 * AsyncPCIClk) - 1MHz
+ */
+static int ppc4xx_pci_sync_clock_ok(u32 sync, u32 async)
+{
+	if (((async - 1000000) > sync) || (sync > ((2 * async) - 1000000)))
+		return 0;
+	else
+		return 1;
+}
+
+int ppc4xx_pci_sync_clock_config(u32 async)
+{
+	sys_info_t sys_info;
+	u32 sync;
+	int div;
+	u32 reg;
+	u32 spcid_val[] = {
+		CPR0_SPCID_SPCIDV0_DIV1, CPR0_SPCID_SPCIDV0_DIV2,
+		CPR0_SPCID_SPCIDV0_DIV3, CPR0_SPCID_SPCIDV0_DIV4 };
+
+	get_sys_info(&sys_info);
+	sync = sys_info.freqPCI;
+
+	/*
+	 * First check if the equation above is met
+	 */
+	if (!ppc4xx_pci_sync_clock_ok(sync, async)) {
+		/*
+		 * Reconfigure PCI sync clock to meet the equation.
+		 * Start with highest possible PCI sync frequency
+		 * (divider 1).
+		 */
+		for (div = 1; div <= 4; div++) {
+			sync = sys_info.freqPLB / div;
+			if (ppc4xx_pci_sync_clock_ok(sync, async))
+			    break;
+		}
+
+		if (div <= 4) {
+			mtcpr(CPR0_SPCID, spcid_val[div]);
+
+			mfcpr(CPR0_ICFG, reg);
+			reg |= CPR0_ICFG_RLI_MASK;
+			mtcpr(CPR0_ICFG, reg);
+
+			/* do chip reset */
+			mtspr(SPRN_DBCR0, 0x20000000);
+		} else {
+			/* Impossible to configure the PCI sync clock */
+			return -1;
+		}
+	}
+
+	return 0;
+}
+#endif

include/ppc440.h

@@ -1701,9 +1701,14 @@
 #define PLLSYS1_NTO1_MASK	0x00000001	/* CPU:PLB N-to-1 ratio */
 #endif /* CONFIG_440GX */
 
-#if defined (CONFIG_440EPX) || defined (CONFIG_440GRX)
+#if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
+    defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
 #define CPR0_ICFG_RLI_MASK	0x80000000
 #define CPR0_SPCID_SPCIDV0_MASK	0x03000000
+#define CPR0_SPCID_SPCIDV0_DIV1	0x01000000
+#define CPR0_SPCID_SPCIDV0_DIV2	0x02000000
+#define CPR0_SPCID_SPCIDV0_DIV3	0x03000000
+#define CPR0_SPCID_SPCIDV0_DIV4	0x00000000
 #define CPR0_PERD_PERDV0_MASK	0x07000000
 #endif
 

include/ppc4xx.h

@@ -221,6 +221,8 @@ static inline void set_mcsr(u32 val)
 	asm volatile("mtspr 0x23c, %0" : "=r" (val) :);
 }
 
+int ppc4xx_pci_sync_clock_config(u32 async);
+
 #endif	/* __ASSEMBLY__ */
 
 /* for multi-cpu support */