1 /*
2 * This file contains common code that is intended to be used across
3 * boards so that it's not replicated.
4 *
5 * Copyright (C) 2011 Xilinx
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17 #include <linux/init.h>
18 #include <linux/kernel.h>
19 #include <linux/cpumask.h>
20 #include <linux/platform_device.h>
21 #include <linux/clk.h>
22 #include <linux/clk-provider.h>
23 #include <linux/clk/zynq.h>
24 #include <linux/clocksource.h>
25 #include <linux/of_address.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_platform.h>
28 #include <linux/of.h>
29 #include <linux/memblock.h>
30 #include <linux/irqchip.h>
31 #include <linux/irqchip/arm-gic.h>
32 #include <linux/slab.h>
33 #include <linux/sys_soc.h>
34
35 #include <asm/mach/arch.h>
36 #include <asm/mach/map.h>
37 #include <asm/mach/time.h>
38 #include <asm/mach-types.h>
39 #include <asm/page.h>
40 #include <asm/pgtable.h>
41 #include <asm/smp_scu.h>
42 #include <asm/system_info.h>
43 #include <asm/hardware/cache-l2x0.h>
44
45 #include "common.h"
46
47 #define ZYNQ_DEVCFG_MCTRL 0x80
48 #define ZYNQ_DEVCFG_PS_VERSION_SHIFT 28
49 #define ZYNQ_DEVCFG_PS_VERSION_MASK 0xF
50
51 void __iomem *zynq_scu_base;
52
53 /**
54 * zynq_memory_init - Initialize special memory
55 *
56 * We need to stop things allocating the low memory as DMA can't work in
57 * the 1st 512K of memory.
58 */
zynq_memory_init(void)59 static void __init zynq_memory_init(void)
60 {
61 if (!__pa(PAGE_OFFSET))
62 memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir));
63 }
64
65 static struct platform_device zynq_cpuidle_device = {
66 .name = "cpuidle-zynq",
67 };
68
69 /**
70 * zynq_get_revision - Get Zynq silicon revision
71 *
72 * Return: Silicon version or -1 otherwise
73 */
zynq_get_revision(void)74 static int __init zynq_get_revision(void)
75 {
76 struct device_node *np;
77 void __iomem *zynq_devcfg_base;
78 u32 revision;
79
80 np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-devcfg-1.0");
81 if (!np) {
82 pr_err("%s: no devcfg node found\n", __func__);
83 return -1;
84 }
85
86 zynq_devcfg_base = of_iomap(np, 0);
87 if (!zynq_devcfg_base) {
88 pr_err("%s: Unable to map I/O memory\n", __func__);
89 return -1;
90 }
91
92 revision = readl(zynq_devcfg_base + ZYNQ_DEVCFG_MCTRL);
93 revision >>= ZYNQ_DEVCFG_PS_VERSION_SHIFT;
94 revision &= ZYNQ_DEVCFG_PS_VERSION_MASK;
95
96 iounmap(zynq_devcfg_base);
97
98 return revision;
99 }
100
zynq_init_late(void)101 static void __init zynq_init_late(void)
102 {
103 zynq_core_pm_init();
104 zynq_pm_late_init();
105 }
106
107 /**
108 * zynq_init_machine - System specific initialization, intended to be
109 * called from board specific initialization.
110 */
zynq_init_machine(void)111 static void __init zynq_init_machine(void)
112 {
113 struct platform_device_info devinfo = { .name = "cpufreq-dt", };
114 struct soc_device_attribute *soc_dev_attr;
115 struct soc_device *soc_dev;
116 struct device *parent = NULL;
117
118 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
119 if (!soc_dev_attr)
120 goto out;
121
122 system_rev = zynq_get_revision();
123
124 soc_dev_attr->family = kasprintf(GFP_KERNEL, "Xilinx Zynq");
125 soc_dev_attr->revision = kasprintf(GFP_KERNEL, "0x%x", system_rev);
126 soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x",
127 zynq_slcr_get_device_id());
128
129 soc_dev = soc_device_register(soc_dev_attr);
130 if (IS_ERR(soc_dev)) {
131 kfree(soc_dev_attr->family);
132 kfree(soc_dev_attr->revision);
133 kfree(soc_dev_attr->soc_id);
134 kfree(soc_dev_attr);
135 goto out;
136 }
137
138 parent = soc_device_to_device(soc_dev);
139
140 out:
141 /*
142 * Finished with the static registrations now; fill in the missing
143 * devices
144 */
145 of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
146
147 platform_device_register(&zynq_cpuidle_device);
148 platform_device_register_full(&devinfo);
149
150 zynq_slcr_init();
151 }
152
zynq_timer_init(void)153 static void __init zynq_timer_init(void)
154 {
155 zynq_early_slcr_init();
156
157 zynq_clock_init();
158 of_clk_init(NULL);
159 clocksource_of_init();
160 }
161
162 static struct map_desc zynq_cortex_a9_scu_map __initdata = {
163 .length = SZ_256,
164 .type = MT_DEVICE,
165 };
166
zynq_scu_map_io(void)167 static void __init zynq_scu_map_io(void)
168 {
169 unsigned long base;
170
171 base = scu_a9_get_base();
172 zynq_cortex_a9_scu_map.pfn = __phys_to_pfn(base);
173 /* Expected address is in vmalloc area that's why simple assign here */
174 zynq_cortex_a9_scu_map.virtual = base;
175 iotable_init(&zynq_cortex_a9_scu_map, 1);
176 zynq_scu_base = (void __iomem *)base;
177 BUG_ON(!zynq_scu_base);
178 }
179
180 /**
181 * zynq_map_io - Create memory mappings needed for early I/O.
182 */
zynq_map_io(void)183 static void __init zynq_map_io(void)
184 {
185 debug_ll_io_init();
186 zynq_scu_map_io();
187 }
188
zynq_irq_init(void)189 static void __init zynq_irq_init(void)
190 {
191 gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
192 irqchip_init();
193 }
194
zynq_system_reset(enum reboot_mode mode,const char * cmd)195 static void zynq_system_reset(enum reboot_mode mode, const char *cmd)
196 {
197 zynq_slcr_system_reset();
198 }
199
200 static const char * const zynq_dt_match[] = {
201 "xlnx,zynq-7000",
202 NULL
203 };
204
205 DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
206 /* 64KB way size, 8-way associativity, parity disabled */
207 .l2c_aux_val = 0x00000000,
208 .l2c_aux_mask = 0xffffffff,
209 .smp = smp_ops(zynq_smp_ops),
210 .map_io = zynq_map_io,
211 .init_irq = zynq_irq_init,
212 .init_machine = zynq_init_machine,
213 .init_late = zynq_init_late,
214 .init_time = zynq_timer_init,
215 .dt_compat = zynq_dt_match,
216 .reserve = zynq_memory_init,
217 .restart = zynq_system_reset,
218 MACHINE_END
219