Das U-Boot: Universal Boot Loader

diff --git a/cpu/mpc824x/drivers/i2c/i2c2.S b/cpu/mpc824x/drivers/i2c/i2c2.S
new file mode 100644 (file)
index 0000000..5cc7c98
--- /dev/null
+++ b/cpu/mpc824x/drivers/i2c/i2c2.S
@@ -0,0 +1,54 @@
+/**************************************
+ *
+ * copyright @ Motorola, 1999
+ *
+ **************************************/
+
+#include <config.h>
+#ifdef CONFIG_HARD_I2C
+#include <ppc_asm.tmpl>
+#include <asm/mmu.h>
+/**********************************************************
+ * function: load_runtime_reg
+ *
+ * input:  r3 - value of eumbbar
+ *         r4 - register offset in embedded utility space
+ *
+ * output: r3 - register content
+ **********************************************************/
+      .text
+      .align 2
+      .global load_runtime_reg
+load_runtime_reg:
+
+/*               xor r5,r5,r5
+*         or  r5,r5,r3
+*
+*            lwbrx     r3,r4,r5
+*/
+             lwbrx r3,r4,r3
+             sync
+
+             bclr 20, 0
+
+/****************************************************************
+ * function: store_runtime_reg
+ *
+ * input: r3 - value of eumbbar
+ *        r4 - register offset in embedded utility space
+ *        r5 - new value to be stored
+ *
+ ****************************************************************/
+           .text
+           .align 2
+           .global store_runtime_reg
+store_runtime_reg:
+
+             stwbrx r5,  r4, r3
+             sync
+
+              bclr   20,0
+
+
+
+#endif /* CONFIG_HARD_I2C */