1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Device Tree support for Armada 370 and XP platforms.
4 *
5 * Copyright (C) 2012 Marvell
6 *
7 * Lior Amsalem <alior@marvell.com>
8 * Gregory CLEMENT <gregory.clement@free-electrons.com>
9 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/of_address.h>
15 #include <linux/of_fdt.h>
16 #include <linux/io.h>
17 #include <linux/clocksource.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/memblock.h>
20 #include <linux/mbus.h>
21 #include <linux/slab.h>
22 #include <linux/irqchip.h>
23 #include <asm/hardware/cache-l2x0.h>
24 #include <asm/mach/arch.h>
25 #include <asm/mach/map.h>
26 #include <asm/mach/time.h>
27 #include <asm/smp_scu.h>
28 #include "armada-370-xp.h"
29 #include "common.h"
30 #include "coherency.h"
31 #include "mvebu-soc-id.h"
32
33 static void __iomem *scu_base;
34
35 /*
36 * Enables the SCU when available. Obviously, this is only useful on
37 * Cortex-A based SOCs, not on PJ4B based ones.
38 */
39 static void __init mvebu_scu_enable(void)
40 {
41 struct device_node *np =
42 of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
43 if (np) {
44 scu_base = of_iomap(np, 0);
45 scu_enable(scu_base);
46 of_node_put(np);
47 }
48 }
49
50 void __iomem *mvebu_get_scu_base(void)
51 {
52 return scu_base;
53 }
54
55 /*
56 * When returning from suspend, the platform goes through the
57 * bootloader, which executes its DDR3 training code. This code has
58 * the unfortunate idea of using the first 10 KB of each DRAM bank to
59 * exercise the RAM and calculate the optimal timings. Therefore, this
60 * area of RAM is overwritten, and shouldn't be used by the kernel if
61 * suspend/resume is supported.
62 */
63
64 #ifdef CONFIG_SUSPEND
65 #define MVEBU_DDR_TRAINING_AREA_SZ (10 * SZ_1K)
66 static int __init mvebu_scan_mem(unsigned long node, const char *uname,
67 int depth, void *data)
68 {
69 const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
70 const __be32 *reg, *endp;
71 int l;
72
73 if (type == NULL || strcmp(type, "memory"))
74 return 0;
75
76 reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
77 if (reg == NULL)
78 reg = of_get_flat_dt_prop(node, "reg", &l);
79 if (reg == NULL)
80 return 0;
81
82 endp = reg + (l / sizeof(__be32));
83 while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
84 u64 base, size;
85
86 base = dt_mem_next_cell(dt_root_addr_cells, ®);
87 size = dt_mem_next_cell(dt_root_size_cells, ®);
88
89 memblock_reserve(base, MVEBU_DDR_TRAINING_AREA_SZ);
90 }
91
92 return 0;
93 }
94
95 static void __init mvebu_memblock_reserve(void)
96 {
97 of_scan_flat_dt(mvebu_scan_mem, NULL);
98 }
99 #else
100 static void __init mvebu_memblock_reserve(void) {}
101 #endif
102
103 static void __init mvebu_init_irq(void)
104 {
105 irqchip_init();
106 mvebu_scu_enable();
107 coherency_init();
108 BUG_ON(mvebu_mbus_dt_init(coherency_available()));
109 }
110
111 static void __init i2c_quirk(void)
112 {
113 struct device_node *np;
114 u32 dev, rev;
115
116 /*
117 * Only revisons more recent than A0 support the offload
118 * mechanism. We can exit only if we are sure that we can
119 * get the SoC revision and it is more recent than A0.
120 */
121 if (mvebu_get_soc_id(&dev, &rev) == 0 && rev > MV78XX0_A0_REV)
122 return;
123
124 for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
125 struct property *new_compat;
126
127 new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
128
129 new_compat->name = kstrdup("compatible", GFP_KERNEL);
130 new_compat->length = sizeof("marvell,mv78230-a0-i2c");
131 new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
132 GFP_KERNEL);
133
134 of_update_property(np, new_compat);
135 }
136 }
137
138 static void __init mvebu_dt_init(void)
139 {
140 if (of_machine_is_compatible("marvell,armadaxp"))
141 i2c_quirk();
142 }
143
144 static void __init armada_370_xp_dt_fixup(void)
145 {
146 #ifdef CONFIG_SMP
147 smp_set_ops(smp_ops(armada_xp_smp_ops));
148 #endif
149 }
150
151 static const char * const armada_370_xp_dt_compat[] __initconst = {
152 "marvell,armada-370-xp",
153 NULL,
154 };
155
156 DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
157 .l2c_aux_val = 0,
158 .l2c_aux_mask = ~0,
159 .init_machine = mvebu_dt_init,
160 .init_irq = mvebu_init_irq,
161 .restart = mvebu_restart,
162 .reserve = mvebu_memblock_reserve,
163 .dt_compat = armada_370_xp_dt_compat,
164 .dt_fixup = armada_370_xp_dt_fixup,
165 MACHINE_END
166
167 static const char * const armada_375_dt_compat[] __initconst = {
168 "marvell,armada375",
169 NULL,
170 };
171
172 DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
173 .l2c_aux_val = 0,
174 .l2c_aux_mask = ~0,
175 .init_irq = mvebu_init_irq,
176 .init_machine = mvebu_dt_init,
177 .restart = mvebu_restart,
178 .dt_compat = armada_375_dt_compat,
179 MACHINE_END
180
181 static const char * const armada_38x_dt_compat[] __initconst = {
182 "marvell,armada380",
183 "marvell,armada385",
184 NULL,
185 };
186
187 DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
188 .l2c_aux_val = 0,
189 .l2c_aux_mask = ~0,
190 .init_irq = mvebu_init_irq,
191 .restart = mvebu_restart,
192 .dt_compat = armada_38x_dt_compat,
193 MACHINE_END
194
195 static const char * const armada_39x_dt_compat[] __initconst = {
196 "marvell,armada390",
197 "marvell,armada398",
198 NULL,
199 };
200
201 DT_MACHINE_START(ARMADA_39X_DT, "Marvell Armada 39x (Device Tree)")
202 .l2c_aux_val = 0,
203 .l2c_aux_mask = ~0,
204 .init_irq = mvebu_init_irq,
205 .restart = mvebu_restart,
206 .dt_compat = armada_39x_dt_compat,
207 MACHINE_END
208
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