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cplbinit.c

/*
 * 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>

#if ANOMALY_05000263
# error the MPU will not function safely while Anomaly 05000263 applies
#endif

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_cplb_tables(void)
{
      int i_d, i_i;
      unsigned long addr;
      unsigned long d_data, i_data;
      unsigned long d_cache = 0, i_cache = 0;

      printk(KERN_INFO "MPU: setting up cplb tables with memory protection\n");

#ifdef CONFIG_BFIN_ICACHE
      i_cache = CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
#endif

#ifdef CONFIG_BFIN_DCACHE
      d_cache = CPLB_L1_CHBL;
#ifdef CONFIG_BFIN_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
#if L1_CODE_LENGTH > 0
      icplb_tbl[i_i].addr = L1_CODE_START;
      icplb_tbl[i_i++].data = L1_IMEMORY | PAGE_SIZE_4MB;
#endif

      /* Cover L2 memory */
#if L2_LENGTH > 0
      dcplb_tbl[i_d].addr = L2_START;
      dcplb_tbl[i_d++].data = L2_DMEMORY | PAGE_SIZE_1MB;
      icplb_tbl[i_i].addr = L2_START;
      icplb_tbl[i_i++].data = L2_IMEMORY | PAGE_SIZE_1MB;
#endif

      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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