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 struct notifier_block platform_nb;
31static unsigned long keystone_dma_pfn_offset __read_mostly;
32
33static int keystone_platform_notifier(struct notifier_block *nb,
34				      unsigned long event, void *data)
35{
36	struct device *dev = data;
37
38	if (event != BUS_NOTIFY_ADD_DEVICE)
39		return NOTIFY_DONE;
40
41	if (!dev)
42		return NOTIFY_BAD;
43
44	if (!dev->of_node) {
45		dev->dma_pfn_offset = keystone_dma_pfn_offset;
46		dev_err(dev, "set dma_pfn_offset%08lx\n",
47			dev->dma_pfn_offset);
48	}
49	return NOTIFY_OK;
50}
51
52static void __init keystone_init(void)
53{
54	keystone_pm_runtime_init();
55	if (platform_nb.notifier_call)
56		bus_register_notifier(&platform_bus_type, &platform_nb);
57	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
58}
59
60static phys_addr_t keystone_virt_to_idmap(unsigned long x)
61{
62	return (phys_addr_t)(x) - CONFIG_PAGE_OFFSET + KEYSTONE_LOW_PHYS_START;
63}
64
65static void __init keystone_init_meminfo(void)
66{
67	bool lpae = IS_ENABLED(CONFIG_ARM_LPAE);
68	bool pvpatch = IS_ENABLED(CONFIG_ARM_PATCH_PHYS_VIRT);
69	phys_addr_t offset = PHYS_OFFSET - KEYSTONE_LOW_PHYS_START;
70	phys_addr_t mem_start, mem_end;
71
72	mem_start = memblock_start_of_DRAM();
73	mem_end = memblock_end_of_DRAM();
74
75	/* nothing to do if we are running out of the <32-bit space */
76	if (mem_start >= KEYSTONE_LOW_PHYS_START &&
77	    mem_end   <= KEYSTONE_LOW_PHYS_END)
78		return;
79
80	if (!lpae || !pvpatch) {
81		pr_crit("Enable %s%s%s to run outside 32-bit space\n",
82		      !lpae ? __stringify(CONFIG_ARM_LPAE) : "",
83		      (!lpae && !pvpatch) ? " and " : "",
84		      !pvpatch ? __stringify(CONFIG_ARM_PATCH_PHYS_VIRT) : "");
85	}
86
87	if (mem_start < KEYSTONE_HIGH_PHYS_START ||
88	    mem_end   > KEYSTONE_HIGH_PHYS_END) {
89		pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
90		      (u64)mem_start, (u64)mem_end);
91	}
92
93	offset += KEYSTONE_HIGH_PHYS_START;
94	__pv_phys_pfn_offset = PFN_DOWN(offset);
95	__pv_offset = (offset - PAGE_OFFSET);
96
97	/* Populate the arch idmap hook */
98	arch_virt_to_idmap = keystone_virt_to_idmap;
99	platform_nb.notifier_call = keystone_platform_notifier;
100	keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
101						KEYSTONE_LOW_PHYS_START);
102
103	pr_info("Switching to high address space at 0x%llx\n", (u64)offset);
104}
105
106static const char *const keystone_match[] __initconst = {
107	"ti,keystone",
108	NULL,
109};
110
111DT_MACHINE_START(KEYSTONE, "Keystone")
112#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
113	.dma_zone_size	= SZ_2G,
114#endif
115	.smp		= smp_ops(keystone_smp_ops),
116	.init_machine	= keystone_init,
117	.dt_compat	= keystone_match,
118	.init_meminfo   = keystone_init_meminfo,
119MACHINE_END
120