microblaze: Checking DTS against PVR for write-back cache

WB cache has special flag in PVR. There is added checking mechanism
for PVR and DTS.

Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/include/asm/pvr.h

@@ -76,20 +76,23 @@ struct pvr_s {
 #define PVR3_FSL_LINKS_MASK		0x00000380
 
 /* ICache config PVR masks */
-#define PVR4_USE_ICACHE_MASK		0x80000000
-#define PVR4_ICACHE_ADDR_TAG_BITS_MASK	0x7C000000
-#define PVR4_ICACHE_USE_FSL_MASK	0x02000000
-#define PVR4_ICACHE_ALLOW_WR_MASK	0x01000000
-#define PVR4_ICACHE_LINE_LEN_MASK	0x00E00000
-#define PVR4_ICACHE_BYTE_SIZE_MASK	0x001F0000
+#define PVR4_USE_ICACHE_MASK		0x80000000 /* ICU */
+#define PVR4_ICACHE_ADDR_TAG_BITS_MASK	0x7C000000 /* ICTS */
+#define PVR4_ICACHE_ALLOW_WR_MASK	0x01000000 /* ICW */
+#define PVR4_ICACHE_LINE_LEN_MASK	0x00E00000 /* ICLL */
+#define PVR4_ICACHE_BYTE_SIZE_MASK	0x001F0000 /* ICBS */
+#define PVR4_ICACHE_ALWAYS_USED		0x00008000 /* IAU */
+#define PVR4_ICACHE_INTERFACE		0x00002000 /* ICI */
 
 /* DCache config PVR masks */
-#define PVR5_USE_DCACHE_MASK		0x80000000
-#define PVR5_DCACHE_ADDR_TAG_BITS_MASK	0x7C000000
-#define PVR5_DCACHE_USE_FSL_MASK	0x02000000
-#define PVR5_DCACHE_ALLOW_WR_MASK	0x01000000
-#define PVR5_DCACHE_LINE_LEN_MASK	0x00E00000
-#define PVR5_DCACHE_BYTE_SIZE_MASK	0x001F0000
+#define PVR5_USE_DCACHE_MASK		0x80000000 /* DCU */
+#define PVR5_DCACHE_ADDR_TAG_BITS_MASK	0x7C000000 /* DCTS */
+#define PVR5_DCACHE_ALLOW_WR_MASK	0x01000000 /* DCW */
+#define PVR5_DCACHE_LINE_LEN_MASK	0x00E00000 /* DCLL */
+#define PVR5_DCACHE_BYTE_SIZE_MASK	0x001F0000 /* DCBS */
+#define PVR5_DCACHE_ALWAYS_USED		0x00008000 /* DAU */
+#define PVR5_DCACHE_USE_WRITEBACK	0x00004000 /* DWB */
+#define PVR5_DCACHE_INTERFACE		0x00002000 /* DCI */
 
 /* ICache base address PVR mask */
 #define PVR6_ICACHE_BASEADDR_MASK	0xFFFFFFFF
@@ -178,11 +181,14 @@ struct pvr_s {
 			((pvr.pvr[5] & PVR5_DCACHE_ADDR_TAG_BITS_MASK) >> 26)
 #define PVR_DCACHE_USE_FSL(pvr)		(pvr.pvr[5] & PVR5_DCACHE_USE_FSL_MASK)
 #define PVR_DCACHE_ALLOW_WR(pvr)	(pvr.pvr[5] & PVR5_DCACHE_ALLOW_WR_MASK)
+/* FIXME two shifts on one line needs any comment */
 #define PVR_DCACHE_LINE_LEN(pvr) \
 			(1 << ((pvr.pvr[5] & PVR5_DCACHE_LINE_LEN_MASK) >> 21))
 #define PVR_DCACHE_BYTE_SIZE(pvr) \
 			(1 << ((pvr.pvr[5] & PVR5_DCACHE_BYTE_SIZE_MASK) >> 16))
 
+#define PVR_DCACHE_USE_WRITEBACK(pvr) \
+			((pvr.pvr[5] & PVR5_DCACHE_USE_WRITEBACK) >> 14)
 
 #define PVR_ICACHE_BASEADDR(pvr)	(pvr.pvr[6] & PVR6_ICACHE_BASEADDR_MASK)
 #define PVR_ICACHE_HIGHADDR(pvr)	(pvr.pvr[7] & PVR7_ICACHE_HIGHADDR_MASK)

arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c

@@ -21,8 +21,14 @@
  */
 
 #define CI(c, p) { ci->c = PVR_##p(pvr); }
+
+#if defined(CONFIG_EARLY_PRINTK) && defined(CONFIG_SERIAL_UARTLITE_CONSOLE)
 #define err_printk(x) \
 	early_printk("ERROR: Microblaze " x "-different for PVR and DTS\n");
+#else
+#define err_printk(x) \
+	printk(KERN_INFO "ERROR: Microblaze " x "-different for PVR and DTS\n");
+#endif
 
 void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu)
 {
@@ -83,6 +89,11 @@ void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu)
 	CI(dcache_base, DCACHE_BASEADDR);
 	CI(dcache_high, DCACHE_HIGHADDR);
 
+	temp = PVR_DCACHE_USE_WRITEBACK(pvr);
+	if (ci->dcache_wb != temp)
+		err_printk("DCACHE WB");
+	ci->dcache_wb = temp;
+
 	CI(use_dopb, D_OPB);
 	CI(use_iopb, I_OPB);
 	CI(use_dlmb, D_LMB);