arch/arm/mach-uniphier/ph1-sld3/bcu_init.c

   1 /*
   2  * Copyright (C) 2011-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <linux/io.h>
   9 #include <mach/bcu-regs.h>
  10
  11 #define ch(x) ((x) >= 32 ? 0 : (x) < 0 ? 0x11111111 : 0x11111111 << (x))
  12
  13 void bcu_init(void)
  14 {
  15         int shift;
  16
  17         writel(0x11111111, BCSCR2); /* 0x80000000-0x9fffffff: IPPC/IPPD-bus */
  18         writel(0x11111111, BCSCR3); /* 0xa0000000-0xbfffffff: IPPC/IPPD-bus */
  19         writel(0x11111111, BCSCR4); /* 0xc0000000-0xdfffffff: IPPC/IPPD-bus */
  20         /*
  21          * 0xe0000000-0xefffffff: Ex-bus
  22          * 0xf0000000-0xfbffffff: ASM bus
  23          * 0xfc000000-0xffffffff: OCM bus
  24          */
  25         writel(0x24440000, BCSCR5);
  26
  27         /* Specify DDR channel */
  28         shift = (CONFIG_SDRAM1_BASE - CONFIG_SDRAM0_BASE) / 0x04000000 * 4;
  29         writel(ch(shift), BCIPPCCHR2); /* 0x80000000-0x9fffffff */
  30
  31         shift -= 32;
  32         writel(ch(shift), BCIPPCCHR3); /* 0xa0000000-0xbfffffff */
  33
  34         shift -= 32;
  35         writel(ch(shift), BCIPPCCHR4); /* 0xc0000000-0xdfffffff */
  36 }