arch/arm/mach-keystone/keystone.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Keystone2 based boards and SOC related code.
   4  *
   5  * Copyright 2013 Texas Instruments, Inc.
   6  *      Cyril Chemparathy <cyril@ti.com>
   7  *      Santosh Shilimkar <santosh.shillimkar@ti.com>
   8  */
   9 #include <linux/io.h>
  10 #include <linux/of.h>
  11 #include <linux/init.h>
  12 #include <linux/of_platform.h>
  13 #include <linux/of_address.h>
  14 #include <linux/memblock.h>
  15
  16 #include <asm/setup.h>
  17 #include <asm/mach/map.h>
  18 #include <asm/mach/arch.h>
  19 #include <asm/mach/time.h>
  20 #include <asm/smp_plat.h>
  21 #include <asm/memory.h>
  22
  23 #include "memory.h"
  24
  25 #include "keystone.h"
  26
  27 static unsigned long keystone_dma_pfn_offset __read_mostly;
  28
  29 static int keystone_platform_notifier(struct notifier_block *nb,
  30                                       unsigned long event, void *data)
  31 {
  32         struct device *dev = data;
  33
  34         if (event != BUS_NOTIFY_ADD_DEVICE)
  35                 return NOTIFY_DONE;
  36
  37         if (!dev)
  38                 return NOTIFY_BAD;
  39
  40         if (!dev->of_node) {
  41                 dev->dma_pfn_offset = keystone_dma_pfn_offset;
  42                 dev_err(dev, "set dma_pfn_offset%08lx\n",
  43                         dev->dma_pfn_offset);
  44         }
  45         return NOTIFY_OK;
  46 }
  47
  48 static struct notifier_block platform_nb = {
  49         .notifier_call = keystone_platform_notifier,
  50 };
  51
  52 static void __init keystone_init(void)
  53 {
  54         if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) {
  55                 keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
  56                                                    KEYSTONE_LOW_PHYS_START);
  57                 bus_register_notifier(&platform_bus_type, &platform_nb);
  58         }
  59         keystone_pm_runtime_init();
  60 }
  61
  62 static long long __init keystone_pv_fixup(void)
  63 {
  64         long long offset;
  65         phys_addr_t mem_start, mem_end;
  66
  67         mem_start = memblock_start_of_DRAM();
  68         mem_end = memblock_end_of_DRAM();
  69
  70         /* nothing to do if we are running out of the <32-bit space */
  71         if (mem_start >= KEYSTONE_LOW_PHYS_START &&
  72             mem_end   <= KEYSTONE_LOW_PHYS_END)
  73                 return 0;
  74
  75         if (mem_start < KEYSTONE_HIGH_PHYS_START ||
  76             mem_end   > KEYSTONE_HIGH_PHYS_END) {
  77                 pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
  78                         (u64)mem_start, (u64)mem_end);
  79                 return 0;
  80         }
  81
  82         offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;
  83
  84         /* Populate the arch idmap hook */
  85         arch_phys_to_idmap_offset = -offset;
  86
  87         return offset;
  88 }
  89
  90 static const char *const keystone_match[] __initconst = {
  91         "ti,k2hk",
  92         "ti,k2e",
  93         "ti,k2l",
  94         "ti,k2g",
  95         "ti,keystone",
  96         NULL,
  97 };
  98
  99 DT_MACHINE_START(KEYSTONE, "Keystone")
 100 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
 101         .dma_zone_size  = SZ_2G,
 102 #endif
 103         .smp            = smp_ops(keystone_smp_ops),
 104         .init_machine   = keystone_init,
 105         .dt_compat      = keystone_match,
 106         .pv_fixup       = keystone_pv_fixup,
 107 MACHINE_END