Patches by Steven Scholz, 05 Apr 2005:

- Use i.MX watchdog timer for reset_cpu()
- Move reset_cpu() out of cpu/arm920t/start.S into the SoC specific
  subdirectories cpu/arm920t/imx/ and cpu/arm920t/s3c24x0/
  (now in interupts.c)

CHANGELOG

@@ -2,6 +2,14 @@
 Changes for U-Boot 1.1.3:
 ======================================================================
 
+* Patch by Steven Scholz, 05 Apr 2005:
+  Use i.MX watchdog timer for reset_cpu()
+
+* Patch by Steven Scholz, 05 Apr 2005:
+  Move reset_cpu() out of cpu/arm920t/start.S into the SoC specific
+  subdirectories cpu/arm920t/imx/ and cpu/arm920t/s3c24x0/
+  (now in interupts.c)
+
 * Add support for MPC8220 based "sorcery" board.
 
 * Add support for TQM8560 board.

cpu/arm920t/imx/interrupts.c

@@ -117,4 +117,23 @@ ulong get_tbclk (void)
 	return tbclk;
 }
 
+/*
+ * Reset the cpu by setting up the watchdog timer and let him time out
+ */
+void reset_cpu (ulong ignored)
+{
+	/* Disable watchdog and set Time-Out field to 0 */
+	WCR = 0x00000000;
+
+	/* Write Service Sequence */
+	WSR = 0x00005555;
+	WSR = 0x0000AAAA;
+
+	/* Enable watchdog */
+	WCR = 0x00000001;
+
+	while (1);
+	/*NOTREACHED*/
+}
+
 #endif /* defined (CONFIG_IMX) */

cpu/arm920t/s3c24x0/interrupts.c

@@ -185,4 +185,31 @@ ulong get_tbclk (void)
 	return tbclk;
 }
 
+/*
+ * reset the cpu by setting up the watchdog timer and let him time out
+ */
+void reset_cpu (ulong ignored)
+{
+	S3C24X0_WATCHDOG * const watchdog;
+
+#ifdef CONFIG_TRAB
+	disable_vfd();
+#endif
+
+	watchdog = S3C24X0_GetBase_WATCHDOG();
+
+	/* Disable watchdog */
+	watchdog->WTCON = 0x0000;
+
+	/* Initialize watchdog timer count register */
+	watchdog->WTCNT = 0x0001;
+
+	/* Enable watchdog timer; assert reset at timer timeout */
+	watchdog->WTCON = 0x0021;
+
+	while(1);	/* loop forever and wait for reset to happen */
+
+	/*NOTREACHED*/
+}
+
 #endif /* defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) */

cpu/arm920t/start.S

@@ -433,39 +433,3 @@ fiq:
 	bl 	do_fiq
 
 #endif
-
-	.align	5
-.globl reset_cpu
-reset_cpu:
-#ifdef CONFIG_S3C2400
-	bl	disable_interrupts
-# ifdef CONFIG_TRAB
-	bl	disable_vfd
-# endif
-	ldr	r1, _rWTCON
-	ldr	r2, _rWTCNT
-	/* Disable watchdog */
-	mov	r3, #0x0000
-	str	r3, [r1]
-	/* Initialize watchdog timer count register */
-	mov	r3, #0x0001
-	str	r3, [r2]
-	/* Enable watchdog timer; assert reset at timer timeout */
-	mov	r3, #0x0021
-	str	r3, [r1]
-_loop_forever:
-	b	_loop_forever
-_rWTCON:
-	.word	0x15300000
-_rWTCNT:
-	.word	0x15300008
-#else /* ! CONFIG_S3C2400 */
-	mov     ip, #0
-	mcr     p15, 0, ip, c7, c7, 0           @ invalidate cache
-	mcr     p15, 0, ip, c8, c7, 0           @ flush TLB (v4)
-	mrc     p15, 0, ip, c1, c0, 0           @ get ctrl register
-	bic     ip, ip, #0x000f                 @ ............wcam
-	bic     ip, ip, #0x2100                 @ ..v....s........
-	mcr     p15, 0, ip, c1, c0, 0           @ ctrl register
-	mov     pc, r0
-#endif /* CONFIG_S3C2400 */

include/asm-arm/arch-imx/imx-regs.h

@@ -52,6 +52,12 @@
 #define IMX_AITC_BASE              (0x23000 + IMX_IO_BASE)
 #define IMX_CSI_BASE               (0x24000 + IMX_IO_BASE)
 
+/* Watchdog Registers*/
+
+#define WCR  __REG(IMX_WDT_BASE + 0x00) /* Watchdog Control Register */
+#define WSR  __REG(IMX_WDT_BASE + 0x04) /* Watchdog Service Register */
+#define WSTR __REG(IMX_WDT_BASE + 0x08) /* Watchdog Status Register  */
+
 /* SYSCTRL Registers */
 #define SIDR   __REG(IMX_SYSCTRL_BASE + 0x4) /* Silicon ID Register		    */
 #define FMCR   __REG(IMX_SYSCTRL_BASE + 0x8) /* Function Multiplex Control Register */