1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * This file contains common code that is intended to be used across
4 * boards so that it's not replicated.
5 *
6 * Copyright (C) 2011 Xilinx
7 */
8
9 #include <linux/init.h>
10 #include <linux/io.h>
11 #include <linux/kernel.h>
12 #include <linux/cpumask.h>
13 #include <linux/platform_device.h>
14 #include <linux/clk.h>
15 #include <linux/clk/zynq.h>
16 #include <linux/clocksource.h>
17 #include <linux/of_address.h>
18 #include <linux/of_clk.h>
19 #include <linux/of_irq.h>
20 #include <linux/of_platform.h>
21 #include <linux/of.h>
22 #include <linux/memblock.h>
23 #include <linux/irqchip.h>
24 #include <linux/irqchip/arm-gic.h>
25 #include <linux/slab.h>
26 #include <linux/sys_soc.h>
27 #include <linux/pgtable.h>
28
29 #include <asm/mach/arch.h>
30 #include <asm/mach/map.h>
31 #include <asm/mach/time.h>
32 #include <asm/mach-types.h>
33 #include <asm/page.h>
34 #include <asm/smp_scu.h>
35 #include <asm/system_info.h>
36 #include <asm/hardware/cache-l2x0.h>
37
38 #include "common.h"
39
40 #define ZYNQ_DEVCFG_MCTRL 0x80
41 #define ZYNQ_DEVCFG_PS_VERSION_SHIFT 28
42 #define ZYNQ_DEVCFG_PS_VERSION_MASK 0xF
43
44 void __iomem *zynq_scu_base;
45
46 /**
47 * zynq_memory_init - Initialize special memory
48 *
49 * We need to stop things allocating the low memory as DMA can't work in
50 * the 1st 512K of memory.
51 */
52 static void __init zynq_memory_init(void)
53 {
54 if (!__pa(PAGE_OFFSET))
55 memblock_reserve(__pa(PAGE_OFFSET), 0x80000);
56 }
57
58 static struct platform_device zynq_cpuidle_device = {
59 .name = "cpuidle-zynq",
60 };
61
62 /**
63 * zynq_get_revision - Get Zynq silicon revision
64 *
65 * Return: Silicon version or -1 otherwise
66 */
67 static int __init zynq_get_revision(void)
68 {
69 struct device_node *np;
70 void __iomem *zynq_devcfg_base;
71 u32 revision;
72
73 np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-devcfg-1.0");
74 if (!np) {
75 pr_err("%s: no devcfg node found\n", __func__);
76 return -1;
77 }
78
79 zynq_devcfg_base = of_iomap(np, 0);
80 of_node_put(np);
81 if (!zynq_devcfg_base) {
82 pr_err("%s: Unable to map I/O memory\n", __func__);
83 return -1;
84 }
85
86 revision = readl(zynq_devcfg_base + ZYNQ_DEVCFG_MCTRL);
87 revision >>= ZYNQ_DEVCFG_PS_VERSION_SHIFT;
88 revision &= ZYNQ_DEVCFG_PS_VERSION_MASK;
89
90 iounmap(zynq_devcfg_base);
91
92 return revision;
93 }
94
95 static void __init zynq_init_late(void)
96 {
97 zynq_core_pm_init();
98 zynq_pm_late_init();
99 }
100
101 /**
102 * zynq_init_machine - System specific initialization, intended to be
103 * called from board specific initialization.
104 */
105 static void __init zynq_init_machine(void)
106 {
107 struct soc_device_attribute *soc_dev_attr;
108 struct soc_device *soc_dev;
109 struct device *parent = NULL;
110
111 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
112 if (!soc_dev_attr)
113 goto out;
114
115 system_rev = zynq_get_revision();
116
117 soc_dev_attr->family = kasprintf(GFP_KERNEL, "Xilinx Zynq");
118 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "0x%x", system_rev);
119 soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x",
120 zynq_slcr_get_device_id());
121
122 soc_dev = soc_device_register(soc_dev_attr);
123 if (IS_ERR(soc_dev)) {
124 kfree(soc_dev_attr->family);
125 kfree(soc_dev_attr->revision);
126 kfree(soc_dev_attr->soc_id);
127 kfree(soc_dev_attr);
128 goto out;
129 }
130
131 parent = soc_device_to_device(soc_dev);
132
133 out:
134 /*
135 * Finished with the static registrations now; fill in the missing
136 * devices
137 */
138 of_platform_default_populate(NULL, NULL, parent);
139
140 platform_device_register(&zynq_cpuidle_device);
141 }
142
143 static void __init zynq_timer_init(void)
144 {
145 zynq_clock_init();
146 of_clk_init(NULL);
147 timer_probe();
148 }
149
150 static struct map_desc zynq_cortex_a9_scu_map __initdata = {
151 .length = SZ_256,
152 .type = MT_DEVICE,
153 };
154
155 static void __init zynq_scu_map_io(void)
156 {
157 unsigned long base;
158
159 base = scu_a9_get_base();
160 zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
161 /* Expected address is in vmalloc area that's why simple assign here */
162 zynq_cortex_a9_scu_map.virtual = base;
163 iotable_init(&zynq_cortex_a9_scu_map, 1);
164 zynq_scu_base = (void __iomem *)base;
165 BUG_ON(!zynq_scu_base);
166 }
167
168 /**
169 * zynq_map_io - Create memory mappings needed for early I/O.
170 */
171 static void __init zynq_map_io(void)
172 {
173 debug_ll_io_init();
174 zynq_scu_map_io();
175 }
176
177 static void __init zynq_irq_init(void)
178 {
179 zynq_early_slcr_init();
180 irqchip_init();
181 }
182
183 static const char * const zynq_dt_match[] = {
184 "xlnx,zynq-7000",
185 NULL
186 };
187
188 DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
189 /* 64KB way size, 8-way associativity, parity disabled */
190 .l2c_aux_val = 0x00400000,
191 .l2c_aux_mask = 0xffbfffff,
192 .smp = smp_ops(zynq_smp_ops),
193 .map_io = zynq_map_io,
194 .init_irq = zynq_irq_init,
195 .init_machine = zynq_init_machine,
196 .init_late = zynq_init_late,
197 .init_time = zynq_timer_init,
198 .dt_compat = zynq_dt_match,
199 .reserve = zynq_memory_init,
200 MACHINE_END
201
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