86xx: Reset update

Update the 86xx reset sequence to try executing a board-specific reset
function.  If the board-specific reset is not implemented or does not
succeed, then assert #HRESET_REQ.  Using #HRESET_REQ is a more standard
reset procedure than the previous method and allows all board
peripherals to be reset if needed.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

1 files changed, 19 insertions, 61 deletions

diff --git a/cpu/mpc86xx/cpu.c b/cpu/mpc86xx/cpu.c
index dc53bee..b2a107d 100644
--- a/cpu/mpc86xx/cpu.c
+++ b/cpu/mpc86xx/cpu.c
@@ -32,6 +32,17 @@
 #include <asm/fsl_law.h>
 
 
+/*
+ * Default board reset function
+ */
+static void
+__board_reset(void)
+{
+	/* Do nothing */
+}
+void board_reset(void) __attribute((weak, alias("__board_reset")));
+
+
 int
 checkcpu(void)
 {
@@ -115,73 +126,20 @@ checkcpu(void)
 }
 
 
-static inline void
-soft_restart(unsigned long addr)
-{
-#if !defined(CONFIG_MPC8641HPCN) && !defined(CONFIG_MPC8610HPCD)
-
-	/*
-	 * SRR0 has system reset vector, SRR1 has default MSR value
-	 * rfi restores MSR from SRR1 and sets the PC to the SRR0 value
-	 */
-
-	__asm__ __volatile__ ("mtspr	26, %0"		:: "r" (addr));
-	__asm__ __volatile__ ("li	4, (1 << 6)"	::: "r4");
-	__asm__ __volatile__ ("mtspr	27, 4");
-	__asm__ __volatile__ ("rfi");
-
-#else /* CONFIG_MPC8641HPCN */
-
-	out8(PIXIS_BASE + PIXIS_RST, 0);
-
-#endif /* !CONFIG_MPC8641HPCN */
-
-	while (1) ;		/* not reached */
-}
-
-
-/*
- * No generic way to do board reset. Simply call soft_reset.
- */
 void
 do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
-#if !defined(CONFIG_MPC8641HPCN) && !defined(CONFIG_MPC8610HPCD)
-
-#ifdef CONFIG_SYS_RESET_ADDRESS
-	ulong addr = CONFIG_SYS_RESET_ADDRESS;
-#else
-	/*
-	 * note: when CONFIG_SYS_MONITOR_BASE points to a RAM address,
-	 * CONFIG_SYS_MONITOR_BASE - sizeof (ulong) is usually a valid
-	 * address. Better pick an address known to be invalid on your
-	 * system and assign it to CONFIG_SYS_RESET_ADDRESS.
-	 */
-	ulong addr = CONFIG_SYS_MONITOR_BASE - sizeof(ulong);
-#endif
-
-	/* flush and disable I/D cache */
-	__asm__ __volatile__ ("mfspr	3, 1008"	::: "r3");
-	__asm__ __volatile__ ("ori	5, 5, 0xcc00"	::: "r5");
-	__asm__ __volatile__ ("ori	4, 3, 0xc00"	::: "r4");
-	__asm__ __volatile__ ("andc	5, 3, 5"	::: "r5");
-	__asm__ __volatile__ ("sync");
-	__asm__ __volatile__ ("mtspr	1008, 4");
-	__asm__ __volatile__ ("isync");
-	__asm__ __volatile__ ("sync");
-	__asm__ __volatile__ ("mtspr	1008, 5");
-	__asm__ __volatile__ ("isync");
-	__asm__ __volatile__ ("sync");
-
-	soft_restart(addr);
-
-#else /* CONFIG_MPC8641HPCN */
+	volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
+	volatile ccsr_gur_t *gur = &immap->im_gur;
 
-	out8(PIXIS_BASE + PIXIS_RST, 0);
+	/* Attempt board-specific reset */
+	board_reset();
 
-#endif /* !CONFIG_MPC8641HPCN */
+	/* Next try asserting HRESET_REQ */
+	out_be32(&gur->rstcr, MPC86xx_RSTCR_HRST_REQ);
 
-	while (1) ;		/* not reached */
+	while (1)
+		;
 }