1/*
2 * Keystone2 based boards and SOC related code.
3 *
4 * Copyright 2013 Texas Instruments, Inc.
5 *	Cyril Chemparathy <cyril@ti.com>
6 *	Santosh Shilimkar <santosh.shillimkar@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
11 */
12#include <linux/io.h>
13#include <linux/of.h>
14#include <linux/init.h>
15#include <linux/of_platform.h>
16#include <linux/of_address.h>
17#include <linux/memblock.h>
18
19#include <asm/setup.h>
20#include <asm/mach/map.h>
21#include <asm/mach/arch.h>
22#include <asm/mach/time.h>
23#include <asm/smp_plat.h>
24#include <asm/memory.h>
25
26#include "memory.h"
27
28#include "keystone.h"
29
30static unsigned long keystone_dma_pfn_offset __read_mostly;
31
32static int keystone_platform_notifier(struct notifier_block *nb,
33				      unsigned long event, void *data)
34{
35	struct device *dev = data;
36
37	if (event != BUS_NOTIFY_ADD_DEVICE)
38		return NOTIFY_DONE;
39
40	if (!dev)
41		return NOTIFY_BAD;
42
43	if (!dev->of_node) {
44		dev->dma_pfn_offset = keystone_dma_pfn_offset;
45		dev_err(dev, "set dma_pfn_offset%08lx\n",
46			dev->dma_pfn_offset);
47	}
48	return NOTIFY_OK;
49}
50
51static struct notifier_block platform_nb = {
52	.notifier_call = keystone_platform_notifier,
53};
54
55static void __init keystone_init(void)
56{
57	if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) {
58		keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
59						   KEYSTONE_LOW_PHYS_START);
60		bus_register_notifier(&platform_bus_type, &platform_nb);
61	}
62	keystone_pm_runtime_init();
63	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
64}
65
66static phys_addr_t keystone_virt_to_idmap(unsigned long x)
67{
68	return (phys_addr_t)(x) - CONFIG_PAGE_OFFSET + KEYSTONE_LOW_PHYS_START;
69}
70
71static long long __init keystone_pv_fixup(void)
72{
73	long long offset;
74	phys_addr_t mem_start, mem_end;
75
76	mem_start = memblock_start_of_DRAM();
77	mem_end = memblock_end_of_DRAM();
78
79	/* nothing to do if we are running out of the <32-bit space */
80	if (mem_start >= KEYSTONE_LOW_PHYS_START &&
81	    mem_end   <= KEYSTONE_LOW_PHYS_END)
82		return 0;
83
84	if (mem_start < KEYSTONE_HIGH_PHYS_START ||
85	    mem_end   > KEYSTONE_HIGH_PHYS_END) {
86		pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
87		        (u64)mem_start, (u64)mem_end);
88		return 0;
89	}
90
91	offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;
92
93	/* Populate the arch idmap hook */
94	arch_virt_to_idmap = keystone_virt_to_idmap;
95
96	return offset;
97}
98
99static const char *const keystone_match[] __initconst = {
100	"ti,k2hk",
101	"ti,k2e",
102	"ti,k2l",
103	"ti,keystone",
104	NULL,
105};
106
107DT_MACHINE_START(KEYSTONE, "Keystone")
108#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
109	.dma_zone_size	= SZ_2G,
110#endif
111	.smp		= smp_ops(keystone_smp_ops),
112	.init_machine	= keystone_init,
113	.dt_compat	= keystone_match,
114	.pv_fixup	= keystone_pv_fixup,
115MACHINE_END
116