ppc/85xx: add cpu init config file for boot from NAND

When boot from NAND, the NAND flash must be connected to br/or0.
Also init RAM(L2 SRAM or DDR SDRAM) for load the second image to
it.

Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 63 insertions, 0 deletions

diff --git a/cpu/mpc85xx/cpu_init_nand.c b/cpu/mpc85xx/cpu_init_nand.c
new file mode 100644
index 0000000..184cca4
--- /dev/null
+++ b/cpu/mpc85xx/cpu_init_nand.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2009 Freescale Semiconductor, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+void cpu_init_f(void)
+{
+	ccsr_lbc_t *lbc = (void *)(CONFIG_SYS_MPC85xx_LBC_ADDR);
+
+	/*
+	 * LCRR - Clock Ratio Register - set up local bus timing
+	 * when needed
+	 */
+	out_be32(&lbc->lcrr, LCRR_DBYP | LCRR_CLKDIV_8);
+
+#if defined(CONFIG_NAND_BR_PRELIM) && defined(CONFIG_NAND_OR_PRELIM)
+	out_be32(&lbc->br0, CONFIG_NAND_BR_PRELIM);
+	out_be32(&lbc->or0, CONFIG_NAND_OR_PRELIM);
+#else
+#error  CONFIG_NAND_BR_PRELIM, CONFIG_NAND_OR_PRELIM must be defined
+#endif
+
+#if defined(CONFIG_SYS_RAMBOOT) && defined(CONFIG_SYS_INIT_L2_ADDR)
+	ccsr_l2cache_t *l2cache = (void *)CONFIG_SYS_MPC85xx_L2_ADDR;
+	char *l2srbar;
+	int i;
+
+	out_be32(&l2cache->l2srbar0, CONFIG_SYS_INIT_L2_ADDR);
+
+	/* set MBECCDIS=1, SBECCDIS=1 */
+	out_be32(&l2cache->l2errdis,
+		(MPC85xx_L2ERRDIS_MBECC | MPC85xx_L2ERRDIS_SBECC));
+
+	/* set L2E=1 & L2SRAM=001 */
+	out_be32(&l2cache->l2ctl,
+		(MPC85xx_L2CTL_L2E | MPC85xx_L2CTL_L2SRAM_ENTIRE));
+
+	/* Initialize L2 SRAM to zero */
+	l2srbar = (char *)CONFIG_SYS_INIT_L2_ADDR;
+	for (i = 0; i < CONFIG_SYS_L2_SIZE; i++)
+		l2srbar[i] = 0;
+#endif
+}