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 
30 static unsigned long keystone_dma_pfn_offset __read_mostly;
31 
32 static 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 
51 static struct notifier_block platform_nb = {
52 	.notifier_call = keystone_platform_notifier,
53 };
54 
55 static 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 
66 static 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 
71 static 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 
99 static const char *const keystone_match[] __initconst = {
100 	"ti,keystone",
101 	NULL,
102 };
103 
104 DT_MACHINE_START(KEYSTONE, "Keystone")
105 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
106 	.dma_zone_size	= SZ_2G,
107 #endif
108 	.smp		= smp_ops(keystone_smp_ops),
109 	.init_machine	= keystone_init,
110 	.dt_compat	= keystone_match,
111 	.pv_fixup	= keystone_pv_fixup,
112 MACHINE_END
113