arch/blackfin/kernel/cplb-mpu/cplbinit.c

   1 /*
   2  * Blackfin CPLB initialization
   3  *
   4  * Copyright 2008-2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/module.h>
  10
  11 #include <asm/blackfin.h>
  12 #include <asm/cplb.h>
  13 #include <asm/cplbinit.h>
  14 #include <asm/mem_map.h>
  15
  16 struct cplb_entry icplb_tbl[NR_CPUS][MAX_CPLBS];
  17 struct cplb_entry dcplb_tbl[NR_CPUS][MAX_CPLBS];
  18
  19 int first_switched_icplb, first_switched_dcplb;
  20 int first_mask_dcplb;
  21
  22 void __init generate_cplb_tables_cpu(unsigned int cpu)
  23 {
  24         int i_d, i_i;
  25         unsigned long addr;
  26         unsigned long d_data, i_data;
  27         unsigned long d_cache = 0, i_cache = 0;
  28
  29         printk(KERN_INFO "MPU: setting up cplb tables with memory protection\n");
  30
  31 #ifdef CONFIG_BFIN_EXTMEM_ICACHEABLE
  32         i_cache = CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND;
  33 #endif
  34
  35 #ifdef CONFIG_BFIN_EXTMEM_DCACHEABLE
  36         d_cache = CPLB_L1_CHBL;
  37 #ifdef CONFIG_BFIN_EXTMEM_WRITETHROUGH
  38         d_cache |= CPLB_L1_AOW | CPLB_WT;
  39 #endif
  40 #endif
  41
  42         i_d = i_i = 0;
  43
  44         /* Set up the zero page.  */
  45         dcplb_tbl[cpu][i_d].addr = 0;
  46         dcplb_tbl[cpu][i_d++].data = SDRAM_OOPS | PAGE_SIZE_1KB;
  47
  48         icplb_tbl[cpu][i_i].addr = 0;
  49         icplb_tbl[cpu][i_i++].data = CPLB_VALID | i_cache | CPLB_USER_RD | PAGE_SIZE_1KB;
  50
  51         /* Cover kernel memory with 4M pages.  */
  52         addr = 0;
  53         d_data = d_cache | CPLB_SUPV_WR | CPLB_VALID | PAGE_SIZE_4MB | CPLB_DIRTY;
  54         i_data = i_cache | CPLB_VALID | CPLB_PORTPRIO | PAGE_SIZE_4MB;
  55
  56         for (; addr < memory_start; addr += 4 * 1024 * 1024) {
  57                 dcplb_tbl[cpu][i_d].addr = addr;
  58                 dcplb_tbl[cpu][i_d++].data = d_data;
  59                 icplb_tbl[cpu][i_i].addr = addr;
  60                 icplb_tbl[cpu][i_i++].data = i_data | (addr == 0 ? CPLB_USER_RD : 0);
  61         }
  62
  63 #ifdef CONFIG_ROMKERNEL
  64         /* Cover kernel XIP flash area */
  65         addr = CONFIG_ROM_BASE & ~(4 * 1024 * 1024 - 1);
  66         dcplb_tbl[cpu][i_d].addr = addr;
  67         dcplb_tbl[cpu][i_d++].data = d_data | CPLB_USER_RD;
  68         icplb_tbl[cpu][i_i].addr = addr;
  69         icplb_tbl[cpu][i_i++].data = i_data | CPLB_USER_RD;
  70 #endif
  71
  72         /* Cover L1 memory.  One 4M area for code and data each is enough.  */
  73 #if L1_DATA_A_LENGTH > 0 || L1_DATA_B_LENGTH > 0
  74         dcplb_tbl[cpu][i_d].addr = get_l1_data_a_start_cpu(cpu);
  75         dcplb_tbl[cpu][i_d++].data = L1_DMEMORY | PAGE_SIZE_4MB;
  76 #endif
  77 #if L1_CODE_LENGTH > 0
  78         icplb_tbl[cpu][i_i].addr = get_l1_code_start_cpu(cpu);
  79         icplb_tbl[cpu][i_i++].data = L1_IMEMORY | PAGE_SIZE_4MB;
  80 #endif
  81
  82         /* Cover L2 memory */
  83 #if L2_LENGTH > 0
  84         dcplb_tbl[cpu][i_d].addr = L2_START;
  85         dcplb_tbl[cpu][i_d++].data = L2_DMEMORY;
  86         icplb_tbl[cpu][i_i].addr = L2_START;
  87         icplb_tbl[cpu][i_i++].data = L2_IMEMORY;
  88 #endif
  89
  90         first_mask_dcplb = i_d;
  91         first_switched_dcplb = i_d + (1 << page_mask_order);
  92         first_switched_icplb = i_i;
  93
  94         while (i_d < MAX_CPLBS)
  95                 dcplb_tbl[cpu][i_d++].data = 0;
  96         while (i_i < MAX_CPLBS)
  97                 icplb_tbl[cpu][i_i++].data = 0;
  98 }
  99
 100 void __init generate_cplb_tables_all(void)
 101 {
 102 }