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