LXR linux/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
  27static unsigned long keystone_dma_pfn_offset __read_mostly;
  28
  29static 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
  48static struct notifier_block platform_nb = {
  49        .notifier_call = keystone_platform_notifier,
  50};
  51
  52static 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
  62static 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
  90static 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
  99DT_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,
 107MACHINE_END
 108