kernel/arch/blackfin/mach-common/cache-c.c

   1 /*
   2  * Blackfin cache control code (simpler control-style functions)
   3  *
   4  * Copyright 2004-2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <asm/blackfin.h>
  10 #include <asm/cplbinit.h>
  11
  12 /* Invalidate the Entire Data cache by
  13  * clearing DMC[1:0] bits
  14  */
  15 void blackfin_invalidate_entire_dcache(void)
  16 {
  17         u32 dmem = bfin_read_DMEM_CONTROL();
  18         bfin_write_DMEM_CONTROL(dmem & ~0xc);
  19         SSYNC();
  20         bfin_write_DMEM_CONTROL(dmem);
  21         SSYNC();
  22 }
  23
  24 /* Invalidate the Entire Instruction cache by
  25  * clearing IMC bit
  26  */
  27 void blackfin_invalidate_entire_icache(void)
  28 {
  29         u32 imem = bfin_read_IMEM_CONTROL();
  30         bfin_write_IMEM_CONTROL(imem & ~0x4);
  31         SSYNC();
  32         bfin_write_IMEM_CONTROL(imem);
  33         SSYNC();
  34 }
  35
  36 #if defined(CONFIG_BFIN_ICACHE) || defined(CONFIG_BFIN_DCACHE)
  37
  38 static void
  39 bfin_cache_init(struct cplb_entry *cplb_tbl, unsigned long cplb_addr,
  40                 unsigned long cplb_data, unsigned long mem_control,
  41                 unsigned long mem_mask)
  42 {
  43         int i;
  44 #ifdef CONFIG_L1_PARITY_CHECK
  45         u32 ctrl;
  46
  47         if (cplb_addr == DCPLB_ADDR0) {
  48                 ctrl = bfin_read32(mem_control) | (1 << RDCHK);
  49                 CSYNC();
  50                 bfin_write32(mem_control, ctrl);
  51                 SSYNC();
  52         }
  53 #endif
  54
  55         for (i = 0; i < MAX_CPLBS; i++) {
  56                 bfin_write32(cplb_addr + i * 4, cplb_tbl[i].addr);
  57                 bfin_write32(cplb_data + i * 4, cplb_tbl[i].data);
  58         }
  59
  60         _enable_cplb(mem_control, mem_mask);
  61 }
  62
  63 #ifdef CONFIG_BFIN_ICACHE
  64 void bfin_icache_init(struct cplb_entry *icplb_tbl)
  65 {
  66         bfin_cache_init(icplb_tbl, ICPLB_ADDR0, ICPLB_DATA0, IMEM_CONTROL,
  67                 (IMC | ENICPLB));
  68 }
  69 #endif
  70
  71 #ifdef CONFIG_BFIN_DCACHE
  72 void bfin_dcache_init(struct cplb_entry *dcplb_tbl)
  73 {
  74         /*
  75          *  Anomaly notes:
  76          *  05000287 - We implement workaround #2 - Change the DMEM_CONTROL
  77          *  register, so that the port preferences for DAG0 and DAG1 are set
  78          *  to port B
  79          */
  80         bfin_cache_init(dcplb_tbl, DCPLB_ADDR0, DCPLB_DATA0, DMEM_CONTROL,
  81                 (DMEM_CNTR | PORT_PREF0 | (ANOMALY_05000287 ? PORT_PREF1 : 0)));
  82 }
  83 #endif
  84
  85 #endif