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
keystone_platform_notifier(struct notifier_block * nb,unsigned long event,void * data)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
keystone_init(void)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
keystone_pv_fixup(void)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