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 
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
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 
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 
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