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-rw-r--r--arch/blackfin/kernel/cplb-mpu/cplbinit.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/cplb-mpu/cplbinit.c b/arch/blackfin/kernel/cplb-mpu/cplbinit.c
new file mode 100644
index 0000000..e2e2b50
--- /dev/null
+++ b/arch/blackfin/kernel/cplb-mpu/cplbinit.c
@@ -0,0 +1,91 @@
+/*
+ * Blackfin CPLB initialization
+ *
+ * Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/module.h>
+
+#include <asm/blackfin.h>
+#include <asm/cplb.h>
+#include <asm/cplbinit.h>
+
+struct cplb_entry icplb_tbl[MAX_CPLBS];
+struct cplb_entry dcplb_tbl[MAX_CPLBS];
+
+int first_switched_icplb, first_switched_dcplb;
+int first_mask_dcplb;
+
+void __init generate_cpl_tables(void)
+{
+ int i_d, i_i;
+ unsigned long addr;
+ unsigned long d_data, i_data;
+ unsigned long d_cache = 0, i_cache = 0;
+
+#ifdef CONFIG_BFIN_ICACHE
+ i_cache = CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
+#endif
+
+#ifdef CONFIG_BFIN_DCACHE
+ d_cache = CPLB_L1_CHBL;
+#ifdef CONFIG_BLKFIN_WT
+ d_cache |= CPLB_L1_AOW | CPLB_WT;
+#endif
+#endif
+ i_d = i_i = 0;
+
+ /* Set up the zero page. */
+ dcplb_tbl[i_d].addr = 0;
+ dcplb_tbl[i_d++].data = SDRAM_OOPS | PAGE_SIZE_1KB;
+
+#if 0
+ icplb_tbl[i_i].addr = 0;
+ icplb_tbl[i_i++].data = i_cache | CPLB_USER_RD | PAGE_SIZE_4KB;
+#endif
+
+ /* Cover kernel memory with 4M pages. */
+ addr = 0;
+ d_data = d_cache | CPLB_SUPV_WR | CPLB_VALID | PAGE_SIZE_4MB | CPLB_DIRTY;
+ i_data = i_cache | CPLB_VALID | CPLB_PORTPRIO | PAGE_SIZE_4MB;
+
+ for (; addr < memory_start; addr += 4 * 1024 * 1024) {
+ dcplb_tbl[i_d].addr = addr;
+ dcplb_tbl[i_d++].data = d_data;
+ icplb_tbl[i_i].addr = addr;
+ icplb_tbl[i_i++].data = i_data | (addr == 0 ? CPLB_USER_RD : 0);
+ }
+
+ /* Cover L1 memory. One 4M area for code and data each is enough. */
+#if L1_DATA_A_LENGTH > 0 || L1_DATA_B_LENGTH > 0
+ dcplb_tbl[i_d].addr = L1_DATA_A_START;
+ dcplb_tbl[i_d++].data = L1_DMEMORY | PAGE_SIZE_4MB;
+#endif
+ icplb_tbl[i_i].addr = L1_CODE_START;
+ icplb_tbl[i_i++].data = L1_IMEMORY | PAGE_SIZE_4MB;
+
+ first_mask_dcplb = i_d;
+ first_switched_dcplb = i_d + (1 << page_mask_order);
+ first_switched_icplb = i_i;
+
+ while (i_d < MAX_CPLBS)
+ dcplb_tbl[i_d++].data = 0;
+ while (i_i < MAX_CPLBS)
+ icplb_tbl[i_i++].data = 0;
+}
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