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/dma-mapping.h>
12#include <linux/init.h>
13#include <linux/of_platform.h>
14#include <linux/of_address.h>
15#include <linux/memblock.h>
16
17#include <asm/setup.h>
18#include <asm/mach/map.h>
19#include <asm/mach/arch.h>
20#include <asm/mach/time.h>
21#include <asm/smp_plat.h>
22#include <asm/memory.h>
23
24#include "memory.h"
25
26#include "keystone.h"
27
28#ifdef CONFIG_ARM_LPAE
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		int ret = dma_direct_set_offset(dev, KEYSTONE_HIGH_PHYS_START,
42						KEYSTONE_LOW_PHYS_START,
43						KEYSTONE_HIGH_PHYS_SIZE);
44		dev_err(dev, "set dma_offset%08llx%s\n",
45			KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START,
46			ret ? " failed" : "");
47	}
48	return NOTIFY_OK;
49}
50
51static struct notifier_block platform_nb = {
52	.notifier_call = keystone_platform_notifier,
53};
54#endif /* CONFIG_ARM_LPAE */
55
56static void __init keystone_init(void)
57{
58#ifdef CONFIG_ARM_LPAE
59	if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START)
60		bus_register_notifier(&platform_bus_type, &platform_nb);
61#endif
62	keystone_pm_runtime_init();
63}
64
65static long long __init keystone_pv_fixup(void)
66{
67	long long offset;
68	u64 mem_start, mem_end;
69
70	mem_start = memblock_start_of_DRAM();
71	mem_end = memblock_end_of_DRAM();
72
73	/* nothing to do if we are running out of the <32-bit space */
74	if (mem_start >= KEYSTONE_LOW_PHYS_START &&
75	    mem_end   <= KEYSTONE_LOW_PHYS_END)
76		return 0;
77
78	if (mem_start < KEYSTONE_HIGH_PHYS_START ||
79	    mem_end   > KEYSTONE_HIGH_PHYS_END) {
80		pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
81		        mem_start, mem_end);
82		return 0;
83	}
84
85	offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;
86
87	/* Populate the arch idmap hook */
88	arch_phys_to_idmap_offset = -offset;
89
90	return offset;
91}
92
93static const char *const keystone_match[] __initconst = {
94	"ti,k2hk",
95	"ti,k2e",
96	"ti,k2l",
97	"ti,k2g",
98	"ti,keystone",
99	NULL,
100};
101
102DT_MACHINE_START(KEYSTONE, "Keystone")
103#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
104	.dma_zone_size	= SZ_2G,
105#endif
106	.smp		= smp_ops(keystone_smp_ops),
107	.init_machine	= keystone_init,
108	.dt_compat	= keystone_match,
109	.pv_fixup	= keystone_pv_fixup,
110MACHINE_END
111