[Blackfin][PATCH] Add BF537 stamp board support

1 files changed, 227 insertions, 0 deletions

diff --git a/cpu/bf537/cpu.c b/cpu/bf537/cpu.c
new file mode 100644
index 0000000..cb8dc3c
--- /dev/null
+++ b/cpu/bf537/cpu.c
@@ -0,0 +1,227 @@
+/*
+ * U-boot - cpu.c CPU specific functions
+ *
+ * Copyright (c) 2005 blackfin.uclinux.org
+ *
+ * (C) Copyright 2000-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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/blackfin.h>
+#include <command.h>
+#include <asm/entry.h>
+#include <asm/cplb.h>
+#include <asm/io.h>
+
+#define CACHE_ON 1
+#define CACHE_OFF 0
+
+extern unsigned int icplb_table[page_descriptor_table_size][2];
+extern unsigned int dcplb_table[page_descriptor_table_size][2];
+
+int do_reset(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+{
+	__asm__ __volatile__("cli r3;" "P0 = %0;" "JUMP (P0);"::"r"(L1_ISRAM)
+	    );
+
+	return 0;
+}
+
+/* These functions are just used to satisfy the linker */
+int cpu_init(void)
+{
+	return 0;
+}
+
+int cleanup_before_linux(void)
+{
+	return 0;
+}
+
+void icache_enable(void)
+{
+	unsigned int *I0, *I1;
+	int i, j = 0;
+
+	if ((*pCHIPID >> 28) < 2)
+		return;
+
+	/* Before enable icache, disable it first */
+	icache_disable();
+	I0 = (unsigned int *)ICPLB_ADDR0;
+	I1 = (unsigned int *)ICPLB_DATA0;
+
+	/* make sure the locked ones go in first */
+	for (i = 0; i < page_descriptor_table_size; i++) {
+		if (CPLB_LOCK & icplb_table[i][1]) {
+			debug("adding %02i %02i 0x%08x 0x%08x\n", i, j,
+				 icplb_table[i][0], icplb_table[i][1]);
+			*I0++ = icplb_table[i][0];
+			*I1++ = icplb_table[i][1];
+			j++;
+		}
+	}
+
+	for (i = 0; i < page_descriptor_table_size; i++) {
+		if (!(CPLB_LOCK & icplb_table[i][1])) {
+			debug("adding %02i %02i 0x%08x 0x%08x\n", i, j,
+				 icplb_table[i][0], icplb_table[i][1]);
+			*I0++ = icplb_table[i][0];
+			*I1++ = icplb_table[i][1];
+			j++;
+			if (j == 16) {
+				break;
+			}
+		}
+	}
+
+	/* Fill the rest with invalid entry */
+	if (j <= 15) {
+		for (; j < 16; j++) {
+			debug("filling %i with 0", j);
+			*I1++ = 0x0;
+		}
+
+	}
+
+	cli();
+	sync();
+	asm(" .align 8; ");
+	*(unsigned int *)IMEM_CONTROL = IMC | ENICPLB;
+	sync();
+	sti();
+}
+
+void icache_disable(void)
+{
+	if ((*pCHIPID >> 28) < 2)
+		return;
+	cli();
+	sync();
+	asm(" .align 8; ");
+	*(unsigned int *)IMEM_CONTROL &= ~(IMC | ENICPLB);
+	sync();
+	sti();
+}
+
+int icache_status(void)
+{
+	unsigned int value;
+	value = *(unsigned int *)IMEM_CONTROL;
+
+	if (value & (IMC | ENICPLB))
+		return CACHE_ON;
+	else
+		return CACHE_OFF;
+}
+
+void dcache_enable(void)
+{
+	unsigned int *I0, *I1;
+	unsigned int temp;
+	int i, j = 0;
+
+	/* Before enable dcache, disable it first */
+	dcache_disable();
+	I0 = (unsigned int *)DCPLB_ADDR0;
+	I1 = (unsigned int *)DCPLB_DATA0;
+
+	/* make sure the locked ones go in first */
+	for (i = 0; i < page_descriptor_table_size; i++) {
+		if (CPLB_LOCK & dcplb_table[i][1]) {
+			debug("adding %02i %02i 0x%08x 0x%08x\n", i, j,
+				 dcplb_table[i][0], dcplb_table[i][1]);
+			*I0++ = dcplb_table[i][0];
+			*I1++ = dcplb_table[i][1];
+			j++;
+		} else {
+			debug("skip   %02i %02i 0x%08x 0x%08x\n", i, j,
+				 dcplb_table[i][0], dcplb_table[i][1]);
+		}
+	}
+
+	for (i = 0; i < page_descriptor_table_size; i++) {
+		if (!(CPLB_LOCK & dcplb_table[i][1])) {
+			debug("adding %02i %02i 0x%08x 0x%08x\n", i, j,
+				 dcplb_table[i][0], dcplb_table[i][1]);
+			*I0++ = dcplb_table[i][0];
+			*I1++ = dcplb_table[i][1];
+			j++;
+			if (j == 16) {
+				break;
+			}
+		}
+	}
+
+	/* Fill the rest with invalid entry */
+	if (j <= 15) {
+		for (; j < 16; j++) {
+			debug("filling %i with 0", j);
+			*I1++ = 0x0;
+		}
+	}
+
+	cli();
+	temp = *(unsigned int *)DMEM_CONTROL;
+	sync();
+	asm(" .align 8; ");
+	*(unsigned int *)DMEM_CONTROL =
+	    ACACHE_BCACHE | ENDCPLB | PORT_PREF0 | temp;
+	sync();
+	sti();
+}
+
+void dcache_disable(void)
+{
+	unsigned int *I0, *I1;
+	int i;
+
+	cli();
+	sync();
+	asm(" .align 8; ");
+	*(unsigned int *)DMEM_CONTROL &=
+	    ~(ACACHE_BCACHE | ENDCPLB | PORT_PREF0);
+	sync();
+	sti();
+
+	/* after disable dcache,
+	 * clear it so we don't confuse the next application
+	 */
+	I0 = (unsigned int *)DCPLB_ADDR0;
+	I1 = (unsigned int *)DCPLB_DATA0;
+
+	for (i = 0; i < 16; i++) {
+		*I0++ = 0x0;
+		*I1++ = 0x0;
+	}
+}
+
+int dcache_status(void)
+{
+	unsigned int value;
+	value = *(unsigned int *)DMEM_CONTROL;
+
+	if (value & (ENDCPLB))
+		return CACHE_ON;
+	else
+		return CACHE_OFF;
+}