hw/ppc/mpc8544_guts: Populate POR PLL ratio status register

Populate this read-only register with some arbitrary values which avoids
U-Boot's get_clocks() to hang().

Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Message-ID: <20241103133412.73536-11-shentey@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

hw/ppc/mpc8544_guts.c

@@ -29,6 +29,12 @@
 #define MPC8544_GUTS_RSTCR_RESET      0x02
 
 #define MPC8544_GUTS_ADDR_PORPLLSR    0x00
+REG32(GUTS_PORPLLSR, 0x00)
+    FIELD(GUTS_PORPLLSR, E500_1_RATIO, 24, 6)
+    FIELD(GUTS_PORPLLSR, E500_0_RATIO, 16, 6)
+    FIELD(GUTS_PORPLLSR, DDR_RATIO, 9, 5)
+    FIELD(GUTS_PORPLLSR, PLAT_RATIO, 1, 5)
+
 #define MPC8544_GUTS_ADDR_PORBMSR     0x04
 #define MPC8544_GUTS_ADDR_PORIMPSCR   0x08
 #define MPC8544_GUTS_ADDR_PORDEVSR    0x0C
@@ -75,6 +81,12 @@ static uint64_t mpc8544_guts_read(void *opaque, hwaddr addr,
 
     addr &= MPC8544_GUTS_MMIO_SIZE - 1;
     switch (addr) {
+    case MPC8544_GUTS_ADDR_PORPLLSR:
+        value = FIELD_DP32(value, GUTS_PORPLLSR, E500_1_RATIO, 6); /* 3:1 */
+        value = FIELD_DP32(value, GUTS_PORPLLSR, E500_0_RATIO, 6); /* 3:1 */
+        value = FIELD_DP32(value, GUTS_PORPLLSR, DDR_RATIO, 12); /* 12:1 */
+        value = FIELD_DP32(value, GUTS_PORPLLSR, PLAT_RATIO, 6); /* 6:1 */
+        break;
     case MPC8544_GUTS_ADDR_PVR:
         value = env->spr[SPR_PVR];
         break;