arch/blackfin/mach-common/scb-init.c

   1 /*
   2  * arch/blackfin/mach-common/scb-init.c - reprogram system cross bar priority
   3  *
   4  * Copyright 2012 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/kernel.h>
  11 #include <asm/scb.h>
  12
  13 __attribute__((l1_text))
  14 inline void scb_mi_write(unsigned long scb_mi_arbw, unsigned int slots,
  15                 unsigned char *scb_mi_prio)
  16 {
  17         unsigned int i;
  18
  19         for (i = 0; i < slots; ++i)
  20                 bfin_write32(scb_mi_arbw, (i << SCB_SLOT_OFFSET) | scb_mi_prio[i]);
  21 }
  22
  23 __attribute__((l1_text))
  24 inline void scb_mi_read(unsigned long scb_mi_arbw, unsigned int slots,
  25                 unsigned char *scb_mi_prio)
  26 {
  27         unsigned int i;
  28
  29         for (i = 0; i < slots; ++i) {
  30                 bfin_write32(scb_mi_arbw, (0xFF << SCB_SLOT_OFFSET) | i);
  31                 scb_mi_prio[i] = bfin_read32(scb_mi_arbw);
  32         }
  33 }
  34
  35 __attribute__((l1_text))
  36 void init_scb(void)
  37 {
  38         unsigned int i, j;
  39         unsigned char scb_tmp_prio[32];
  40
  41         pr_info("Init System Crossbar\n");
  42         for (i = 0; scb_data[i].scb_mi_arbr > 0; ++i) {
  43
  44                 scb_mi_write(scb_data[i].scb_mi_arbw, scb_data[i].scb_mi_slots, scb_data[i].scb_mi_prio);
  45
  46                 pr_debug("scb priority at 0x%lx:\n", scb_data[i].scb_mi_arbr);
  47                 scb_mi_read(scb_data[i].scb_mi_arbw, scb_data[i].scb_mi_slots, scb_tmp_prio);
  48                 for (j = 0; j < scb_data[i].scb_mi_slots; ++j)
  49                         pr_debug("slot %d = %d\n", j, scb_tmp_prio[j]);
  50         }
  51
  52 }