drivers/cache/cache-l2x0.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2019 Intel Corporation <www.intel.com>
   4  */
   5 #include <common.h>
   6 #include <command.h>
   7 #include <dm.h>
   8
   9 #include <asm/io.h>
  10 #include <asm/pl310.h>
  11
  12 static void l2c310_of_parse_and_init(struct udevice *dev)
  13 {
  14         u32 tag[3] = { 0, 0, 0 };
  15         u32 saved_reg, prefetch;
  16         struct pl310_regs *regs = (struct pl310_regs *)dev_read_addr(dev);
  17
  18         /* Disable the L2 Cache */
  19         clrbits_le32(&regs->pl310_ctrl, L2X0_CTRL_EN);
  20
  21         saved_reg = readl(&regs->pl310_aux_ctrl);
  22         if (!dev_read_u32(dev, "prefetch-data", &prefetch)) {
  23                 if (prefetch)
  24                         saved_reg |= L310_AUX_CTRL_DATA_PREFETCH_MASK;
  25                 else
  26                         saved_reg &= ~L310_AUX_CTRL_DATA_PREFETCH_MASK;
  27         }
  28
  29         if (!dev_read_u32(dev, "prefetch-instr", &prefetch)) {
  30                 if (prefetch)
  31                         saved_reg |= L310_AUX_CTRL_INST_PREFETCH_MASK;
  32                 else
  33                         saved_reg &= ~L310_AUX_CTRL_INST_PREFETCH_MASK;
  34         }
  35
  36         if (dev_read_bool(dev, "arm,shared-override"))
  37                 saved_reg |= L310_SHARED_ATT_OVERRIDE_ENABLE;
  38
  39         writel(saved_reg, &regs->pl310_aux_ctrl);
  40
  41         saved_reg = readl(&regs->pl310_tag_latency_ctrl);
  42         if (!dev_read_u32_array(dev, "arm,tag-latency", tag, 3))
  43                 saved_reg |= L310_LATENCY_CTRL_RD(tag[0] - 1) |
  44                              L310_LATENCY_CTRL_WR(tag[1] - 1) |
  45                              L310_LATENCY_CTRL_SETUP(tag[2] - 1);
  46         writel(saved_reg, &regs->pl310_tag_latency_ctrl);
  47
  48         saved_reg = readl(&regs->pl310_data_latency_ctrl);
  49         if (!dev_read_u32_array(dev, "arm,data-latency", tag, 3))
  50                 saved_reg |= L310_LATENCY_CTRL_RD(tag[0] - 1) |
  51                              L310_LATENCY_CTRL_WR(tag[1] - 1) |
  52                              L310_LATENCY_CTRL_SETUP(tag[2] - 1);
  53         writel(saved_reg, &regs->pl310_data_latency_ctrl);
  54
  55         /* Enable the L2 cache */
  56         setbits_le32(&regs->pl310_ctrl, L2X0_CTRL_EN);
  57 }
  58
  59 static int l2x0_probe(struct udevice *dev)
  60 {
  61         l2c310_of_parse_and_init(dev);
  62
  63         return 0;
  64 }
  65
  66
  67 static const struct udevice_id l2x0_ids[] = {
  68         { .compatible = "arm,pl310-cache" },
  69         {}
  70 };
  71
  72 U_BOOT_DRIVER(pl310_cache) = {
  73         .name   = "pl310_cache",
  74         .id     = UCLASS_CACHE,
  75         .of_match = l2x0_ids,
  76         .probe  = l2x0_probe,
  77         .flags  = DM_FLAG_PRE_RELOC,
  78 };