[POWERPC] Derive ebc ranges property from EBC registers

[linux-2.6-omap-h63xx.git] / arch / powerpc / boot / 44x.c

diff --git a/arch/powerpc/boot/44x.c b/arch/powerpc/boot/44x.c
index bc3f570ff9ba51877891a8b0fd66b9697590b94c..9f64e840bef628d062bdef0327afa8b9692b7420 100644 (file)
--- a/arch/powerpc/boot/44x.c
+++ b/arch/powerpc/boot/44x.c
@@ -54,3 +54,32 @@ void ibm44x_dbcr_reset(void)
                );
 
 }
+
+/* Read 4xx EBC bus bridge registers to get mappings of the peripheral
+ * banks into the OPB address space */
+void ibm4xx_fixup_ebc_ranges(const char *ebc)
+{
+       void *devp;
+       u32 bxcr;
+       u32 ranges[EBC_NUM_BANKS*4];
+       u32 *p = ranges;
+       int i;
+
+       for (i = 0; i < EBC_NUM_BANKS; i++) {
+               mtdcr(DCRN_EBC0_CFGADDR, EBC_BXCR(i));
+               bxcr = mfdcr(DCRN_EBC0_CFGDATA);
+
+               if ((bxcr & EBC_BXCR_BU) != EBC_BXCR_BU_OFF) {
+                       *p++ = i;
+                       *p++ = 0;
+                       *p++ = bxcr & EBC_BXCR_BAS;
+                       *p++ = EBC_BXCR_BANK_SIZE(bxcr);
+               }
+       }
+
+       devp = finddevice(ebc);
+       if (! devp)
+               fatal("Couldn't locate EBC node %s\n\r", ebc);
+
+       setprop(devp, "ranges", ranges, (p - ranges) * sizeof(u32));
+}