hw/char/mchp_pfsoc_mmuart: Simplify MCHP_PFSOC_MMUART_REG definition

The current MCHP_PFSOC_MMUART_REG_SIZE definition represent the
size occupied by all the registers. However all registers are
32-bit wide, and the MemoryRegionOps handlers are restricted to
32-bit:

  static const MemoryRegionOps mchp_pfsoc_mmuart_ops = {
      .read = mchp_pfsoc_mmuart_read,
      .write = mchp_pfsoc_mmuart_write,
      .impl = {
          .min_access_size = 4,
          .max_access_size = 4,
      },

Avoid being triskaidekaphobic, simplify by using the number of
registers.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Tested-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210925133407.1259392-2-f4bug@amsat.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

hw/char/mchp_pfsoc_mmuart.c

@@ -29,13 +29,14 @@ static uint64_t mchp_pfsoc_mmuart_read(void *opaque, hwaddr addr, unsigned size)
 {
     MchpPfSoCMMUartState *s = opaque;
 
-    if (addr >= MCHP_PFSOC_MMUART_REG_SIZE) {
+    addr >>= 2;
+    if (addr >= MCHP_PFSOC_MMUART_REG_COUNT) {
         qemu_log_mask(LOG_GUEST_ERROR, "%s: read: addr=0x%" HWADDR_PRIx "\n",
-                      __func__, addr);
+                      __func__, addr << 2);
         return 0;
     }
 
-    return s->reg[addr / sizeof(uint32_t)];
+    return s->reg[addr];
 }
 
 static void mchp_pfsoc_mmuart_write(void *opaque, hwaddr addr,
@@ -44,13 +45,14 @@ static void mchp_pfsoc_mmuart_write(void *opaque, hwaddr addr,
     MchpPfSoCMMUartState *s = opaque;
     uint32_t val32 = (uint32_t)value;
 
-    if (addr >= MCHP_PFSOC_MMUART_REG_SIZE) {
+    addr >>= 2;
+    if (addr >= MCHP_PFSOC_MMUART_REG_COUNT) {
         qemu_log_mask(LOG_GUEST_ERROR, "%s: bad write: addr=0x%" HWADDR_PRIx
-                      " v=0x%x\n", __func__, addr, val32);
+                      " v=0x%x\n", __func__, addr << 2, val32);
         return;
     }
 
-    s->reg[addr / sizeof(uint32_t)] = val32;
+    s->reg[addr] = val32;
 }
 
 static const MemoryRegionOps mchp_pfsoc_mmuart_ops = {

include/hw/char/mchp_pfsoc_mmuart.h

@@ -30,7 +30,7 @@
 
 #include "hw/char/serial.h"
 
-#define MCHP_PFSOC_MMUART_REG_SIZE  52
+#define MCHP_PFSOC_MMUART_REG_COUNT 13
 
 typedef struct MchpPfSoCMMUartState {
     MemoryRegion iomem;
@@ -39,7 +39,7 @@ typedef struct MchpPfSoCMMUartState {
 
     SerialMM *serial;
 
-    uint32_t reg[MCHP_PFSOC_MMUART_REG_SIZE / sizeof(uint32_t)];
+    uint32_t reg[MCHP_PFSOC_MMUART_REG_COUNT];
 } MchpPfSoCMMUartState;
 
 /**