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
10 #include <linux/io.h>
11 #include <linux/dma-map-ops.h>
12 #include <linux/init.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/pm_clock.h>
15 #include <linux/memblock.h>
16 #include <linux/of.h>
17 #include <linux/platform_device.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/page.h>
24
25 #define KEYSTONE_LOW_PHYS_START 0x80000000ULL
26 #define KEYSTONE_LOW_PHYS_SIZE 0x80000000ULL /* 2G */
27 #define KEYSTONE_LOW_PHYS_END (KEYSTONE_LOW_PHYS_START + \
28 KEYSTONE_LOW_PHYS_SIZE - 1)
29
30 #define KEYSTONE_HIGH_PHYS_START 0x800000000ULL
31 #define KEYSTONE_HIGH_PHYS_SIZE 0x400000000ULL /* 16G */
32 #define KEYSTONE_HIGH_PHYS_END (KEYSTONE_HIGH_PHYS_START + \
33 KEYSTONE_HIGH_PHYS_SIZE - 1)
34
35 static struct dev_pm_domain keystone_pm_domain = {
36 .ops = {
37 USE_PM_CLK_RUNTIME_OPS
38 USE_PLATFORM_PM_SLEEP_OPS
39 },
40 };
41
42 static struct pm_clk_notifier_block platform_domain_notifier = {
43 .pm_domain = &keystone_pm_domain,
44 .con_ids = { NULL },
45 };
46
47 static const struct of_device_id of_keystone_table[] = {
48 {.compatible = "ti,k2hk"},
49 {.compatible = "ti,k2e"},
50 {.compatible = "ti,k2l"},
51 { /* end of list */ },
52 };
53
keystone_pm_runtime_init(void)54 static int __init keystone_pm_runtime_init(void)
55 {
56 struct device_node *np;
57
58 np = of_find_matching_node(NULL, of_keystone_table);
59 if (!np)
60 return 0;
61
62 pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier);
63
64 return 0;
65 }
66
67 #ifdef CONFIG_ARM_LPAE
keystone_platform_notifier(struct notifier_block * nb,unsigned long event,void * data)68 static int keystone_platform_notifier(struct notifier_block *nb,
69 unsigned long event, void *data)
70 {
71 struct device *dev = data;
72
73 if (event != BUS_NOTIFY_ADD_DEVICE)
74 return NOTIFY_DONE;
75
76 if (!dev)
77 return NOTIFY_BAD;
78
79 if (!dev->of_node) {
80 int ret = dma_direct_set_offset(dev, KEYSTONE_HIGH_PHYS_START,
81 KEYSTONE_LOW_PHYS_START,
82 KEYSTONE_HIGH_PHYS_SIZE);
83 dev_err(dev, "set dma_offset%08llx%s\n",
84 KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START,
85 ret ? " failed" : "");
86 }
87 return NOTIFY_OK;
88 }
89
90 static struct notifier_block platform_nb = {
91 .notifier_call = keystone_platform_notifier,
92 };
93 #endif /* CONFIG_ARM_LPAE */
94
keystone_init(void)95 static void __init keystone_init(void)
96 {
97 #ifdef CONFIG_ARM_LPAE
98 if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START)
99 bus_register_notifier(&platform_bus_type, &platform_nb);
100 #endif
101 keystone_pm_runtime_init();
102 }
103
keystone_pv_fixup(void)104 static long long __init keystone_pv_fixup(void)
105 {
106 long long offset;
107 u64 mem_start, mem_end;
108
109 mem_start = memblock_start_of_DRAM();
110 mem_end = memblock_end_of_DRAM();
111
112 /* nothing to do if we are running out of the <32-bit space */
113 if (mem_start >= KEYSTONE_LOW_PHYS_START &&
114 mem_end <= KEYSTONE_LOW_PHYS_END)
115 return 0;
116
117 if (mem_start < KEYSTONE_HIGH_PHYS_START ||
118 mem_end > KEYSTONE_HIGH_PHYS_END) {
119 pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
120 mem_start, mem_end);
121 return 0;
122 }
123
124 offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;
125
126 /* Populate the arch idmap hook */
127 arch_phys_to_idmap_offset = -offset;
128
129 return offset;
130 }
131
132 static const char *const keystone_match[] __initconst = {
133 "ti,k2hk",
134 "ti,k2e",
135 "ti,k2l",
136 "ti,k2g",
137 "ti,keystone",
138 NULL,
139 };
140
141 DT_MACHINE_START(KEYSTONE, "Keystone")
142 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
143 .dma_zone_size = SZ_2G,
144 #endif
145 .init_machine = keystone_init,
146 .dt_compat = keystone_match,
147 .pv_fixup = keystone_pv_fixup,
148 MACHINE_END
149