arch/arm/mach-prima2/l2x0.c

   1 /*
   2  * l2 cache initialization for CSR SiRFprimaII
   3  *
   4  * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
   5  *
   6  * Licensed under GPLv2 or later.
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/io.h>
  12 #include <linux/errno.h>
  13 #include <linux/of.h>
  14 #include <linux/of_address.h>
  15 #include <asm/hardware/cache-l2x0.h>
  16 #include <mach/memory.h>
  17
  18 #define L2X0_ADDR_FILTERING_START       0xC00
  19 #define L2X0_ADDR_FILTERING_END         0xC04
  20
  21 static struct of_device_id l2x_ids[]  = {
  22         { .compatible = "arm,pl310-cache" },
  23 };
  24
  25 static int __init sirfsoc_of_l2x_init(void)
  26 {
  27         struct device_node *np;
  28         void __iomem *sirfsoc_l2x_base;
  29
  30         np = of_find_matching_node(NULL, l2x_ids);
  31         if (!np)
  32                 panic("unable to find compatible l2x node in dtb\n");
  33
  34         sirfsoc_l2x_base = of_iomap(np, 0);
  35         if (!sirfsoc_l2x_base)
  36                 panic("unable to map l2x cpu registers\n");
  37
  38         of_node_put(np);
  39
  40         if (!(readl_relaxed(sirfsoc_l2x_base + L2X0_CTRL) & 1)) {
  41                 /*
  42                  * set the physical memory windows L2 cache will cover
  43                  */
  44                 writel_relaxed(PLAT_PHYS_OFFSET + 1024 * 1024 * 1024,
  45                         sirfsoc_l2x_base + L2X0_ADDR_FILTERING_END);
  46                 writel_relaxed(PLAT_PHYS_OFFSET | 0x1,
  47                         sirfsoc_l2x_base + L2X0_ADDR_FILTERING_START);
  48
  49                 writel_relaxed(0,
  50                         sirfsoc_l2x_base + L2X0_TAG_LATENCY_CTRL);
  51                 writel_relaxed(0,
  52                         sirfsoc_l2x_base + L2X0_DATA_LATENCY_CTRL);
  53         }
  54         l2x0_init((void __iomem *)sirfsoc_l2x_base, 0x00040000,
  55                 0x00000000);
  56
  57         return 0;
  58 }
  59 early_initcall(sirfsoc_of_l2x_init);