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/smp_plat.h>
22 #include <asm/memory.h>
23 
24 #include "memory.h"
25 
26 #include "keystone.h"
27 
28 #ifdef CONFIG_ARM_LPAE
29 static 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 
51 static struct notifier_block platform_nb = {
52 	.notifier_call = keystone_platform_notifier,
53 };
54 #endif /* CONFIG_ARM_LPAE */
55 
56 static 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 
65 static long long __init keystone_pv_fixup(void)
66 {
67 	long long offset;
68 	phys_addr_t 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 		        (u64)mem_start, (u64)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 
93 static 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 
102 DT_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,
110 MACHINE_END
111