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-map-ops.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/memory.h>
22 
23 #include "memory.h"
24 
25 #include "keystone.h"
26 
27 #ifdef CONFIG_ARM_LPAE
28 static int keystone_platform_notifier(struct notifier_block *nb,
29 				      unsigned long event, void *data)
30 {
31 	struct device *dev = data;
32 
33 	if (event != BUS_NOTIFY_ADD_DEVICE)
34 		return NOTIFY_DONE;
35 
36 	if (!dev)
37 		return NOTIFY_BAD;
38 
39 	if (!dev->of_node) {
40 		int ret = dma_direct_set_offset(dev, KEYSTONE_HIGH_PHYS_START,
41 						KEYSTONE_LOW_PHYS_START,
42 						KEYSTONE_HIGH_PHYS_SIZE);
43 		dev_err(dev, "set dma_offset%08llx%s\n",
44 			KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START,
45 			ret ? " failed" : "");
46 	}
47 	return NOTIFY_OK;
48 }
49 
50 static struct notifier_block platform_nb = {
51 	.notifier_call = keystone_platform_notifier,
52 };
53 #endif /* CONFIG_ARM_LPAE */
54 
55 static void __init keystone_init(void)
56 {
57 #ifdef CONFIG_ARM_LPAE
58 	if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START)
59 		bus_register_notifier(&platform_bus_type, &platform_nb);
60 #endif
61 	keystone_pm_runtime_init();
62 }
63 
64 static long long __init keystone_pv_fixup(void)
65 {
66 	long long offset;
67 	u64 mem_start, mem_end;
68 
69 	mem_start = memblock_start_of_DRAM();
70 	mem_end = memblock_end_of_DRAM();
71 
72 	/* nothing to do if we are running out of the <32-bit space */
73 	if (mem_start >= KEYSTONE_LOW_PHYS_START &&
74 	    mem_end   <= KEYSTONE_LOW_PHYS_END)
75 		return 0;
76 
77 	if (mem_start < KEYSTONE_HIGH_PHYS_START ||
78 	    mem_end   > KEYSTONE_HIGH_PHYS_END) {
79 		pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
80 		        mem_start, mem_end);
81 		return 0;
82 	}
83 
84 	offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;
85 
86 	/* Populate the arch idmap hook */
87 	arch_phys_to_idmap_offset = -offset;
88 
89 	return offset;
90 }
91 
92 static const char *const keystone_match[] __initconst = {
93 	"ti,k2hk",
94 	"ti,k2e",
95 	"ti,k2l",
96 	"ti,k2g",
97 	"ti,keystone",
98 	NULL,
99 };
100 
101 DT_MACHINE_START(KEYSTONE, "Keystone")
102 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
103 	.dma_zone_size	= SZ_2G,
104 #endif
105 	.init_machine	= keystone_init,
106 	.dt_compat	= keystone_match,
107 	.pv_fixup	= keystone_pv_fixup,
108 MACHINE_END
109