GNU Linux-libre 4.19.264-gnu1
[releases.git] / arch / arm / mach-keystone / keystone.c
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 }
64
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