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
keystone_platform_notifier(struct notifier_block * nb,unsigned long event,void * data)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
keystone_init(void)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
keystone_pv_fixup(void)65 static long long __init keystone_pv_fixup(void)
66 {
67 long long offset;
68 u64 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 mem_start, 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