hw/arm/pxa2xx: Set value default values for CCCR and CKEN on PXA255

The code used default values for PXA270 to configure CCCR. For PXA255,
the resulting register value is invalid (unsupported) and resulted
in a division by zero in the Linux kernel. Use default values from
datasheet instead.
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Message-id: 1477361273-18888-1-git-send-email-linux@roeck-us.net
[PMM: fixed tabs-vs-spaces nit]
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/pxa2xx.c

@@ -2267,7 +2267,9 @@ PXA2xxState *pxa255_init(MemoryRegion *address_space, unsigned int sdram_size)
                     qdev_get_gpio_in(s->pic, PXA2XX_PIC_LCD));
 
     s->cm_base = 0x41300000;
-    s->cm_regs[CCCR >> 2] = 0x02000210;	/* 416.0 MHz */
+    s->cm_regs[CCCR >> 2] = 0x00000121;         /* from datasheet */
+    s->cm_regs[CKEN >> 2] = 0x00017def;         /* from datasheet */
+
     s->clkcfg = 0x00000009;		/* Turbo mode active */
     memory_region_init_io(&s->cm_iomem, NULL, &pxa2xx_cm_ops, s, "pxa2xx-cm", 0x1000);
     memory_region_add_subregion(address_space, s->cm_base, &s->cm_iomem);