openpic: Added BRR1 register

Linux mpic driver uses (changes may be in pipeline to get upstreamed soon)
BRR1. This patch adds the support to emulate readonly FSL BRR1 register.

Currently QEMU does not fully emulate any version on MPIC, so the MPIC
Major number and Minor number are set to 0.
Signed-off-by: NBharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

hw/openpic.c

@@ -130,6 +130,17 @@ enum {
 #define MPIC_CPU_REG_START        0x20000
 #define MPIC_CPU_REG_SIZE         0x100 + ((MAX_CPU - 1) * 0x1000)
 
+/*
+ * Block Revision Register1 (BRR1): QEMU does not fully emulate
+ * any version on MPIC. So to start with, set the IP version to 0.
+ *
+ * NOTE: This is Freescale MPIC specific register. Keep it here till
+ * this code is refactored for different variants of OPENPIC and MPIC.
+ */
+#define FSL_BRR1_IPID (0x0040 << 16) /* 16 bit IP-block ID */
+#define FSL_BRR1_IPMJ (0x00 << 8) /* 8 bit IP major number */
+#define FSL_BRR1_IPMN 0x00 /* 8 bit IP minor number */
+
 enum mpic_ide_bits {
     IDR_EP     = 31,
     IDR_CI0     = 30,
@@ -595,6 +606,8 @@ static void openpic_gbl_write (void *opaque, target_phys_addr_t addr, uint32_t v
     if (addr & 0xF)
         return;
     switch (addr) {
+    case 0x00: /* Block Revision Register1 (BRR1) is Readonly */
+        break;
     case 0x40:
     case 0x50:
     case 0x60:
@@ -671,6 +684,7 @@ static uint32_t openpic_gbl_read (void *opaque, target_phys_addr_t addr)
     case 0x1090: /* PINT */
         retval = 0x00000000;
         break;
+    case 0x00: /* Block Revision Register1 (BRR1) */
     case 0x40:
     case 0x50:
     case 0x60:
@@ -893,6 +907,9 @@ static uint32_t openpic_cpu_read_internal(void *opaque, target_phys_addr_t addr,
     dst = &opp->dst[idx];
     addr &= 0xFF0;
     switch (addr) {
+    case 0x00: /* Block Revision Register1 (BRR1) */
+        retval = FSL_BRR1_IPID | FSL_BRR1_IPMJ | FSL_BRR1_IPMN;
+        break;
     case 0x80: /* PCTP */
         retval = dst->pctp;
         break;