1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Samsung Exynos Flattened Device Tree enabled machine
4 //
5 // Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
6 // http://www.samsung.com
7
8 #include <linux/init.h>
9 #include <linux/io.h>
10 #include <linux/of.h>
11 #include <linux/of_address.h>
12 #include <linux/of_fdt.h>
13 #include <linux/platform_device.h>
14 #include <linux/irqchip.h>
15 #include <linux/soc/samsung/exynos-regs-pmu.h>
16
17 #include <asm/cacheflush.h>
18 #include <asm/hardware/cache-l2x0.h>
19 #include <asm/mach/arch.h>
20 #include <asm/mach/map.h>
21
22 #include "common.h"
23
24 #define S3C_ADDR_BASE 0xF6000000
25 #define S3C_ADDR(x) ((void __iomem __force *)S3C_ADDR_BASE + (x))
26 #define S5P_VA_CHIPID S3C_ADDR(0x02000000)
27
28 static struct platform_device exynos_cpuidle = {
29 .name = "exynos_cpuidle",
30 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
31 .dev.platform_data = exynos_enter_aftr,
32 #endif
33 .id = -1,
34 };
35
36 void __iomem *sysram_base_addr __ro_after_init;
37 phys_addr_t sysram_base_phys __ro_after_init;
38 void __iomem *sysram_ns_base_addr __ro_after_init;
39
40 unsigned long exynos_cpu_id;
41 static unsigned int exynos_cpu_rev;
42
exynos_rev(void)43 unsigned int exynos_rev(void)
44 {
45 return exynos_cpu_rev;
46 }
47
exynos_sysram_init(void)48 void __init exynos_sysram_init(void)
49 {
50 struct device_node *node;
51
52 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
53 struct resource res;
54 if (!of_device_is_available(node))
55 continue;
56
57 of_address_to_resource(node, 0, &res);
58 sysram_base_addr = ioremap(res.start, resource_size(&res));
59 sysram_base_phys = res.start;
60 of_node_put(node);
61 break;
62 }
63
64 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
65 if (!of_device_is_available(node))
66 continue;
67 sysram_ns_base_addr = of_iomap(node, 0);
68 of_node_put(node);
69 break;
70 }
71 }
72
exynos_fdt_map_chipid(unsigned long node,const char * uname,int depth,void * data)73 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
74 int depth, void *data)
75 {
76 struct map_desc iodesc;
77 const __be32 *reg;
78 int len;
79
80 if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid"))
81 return 0;
82
83 reg = of_get_flat_dt_prop(node, "reg", &len);
84 if (reg == NULL || len != (sizeof(unsigned long) * 2))
85 return 0;
86
87 iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
88 iodesc.length = be32_to_cpu(reg[1]) - 1;
89 iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
90 iodesc.type = MT_DEVICE;
91 iotable_init(&iodesc, 1);
92 return 1;
93 }
94
exynos_init_io(void)95 static void __init exynos_init_io(void)
96 {
97 debug_ll_io_init();
98
99 of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
100
101 /* detect cpu id and rev. */
102 exynos_cpu_id = readl_relaxed(S5P_VA_CHIPID);
103 exynos_cpu_rev = exynos_cpu_id & 0xFF;
104
105 pr_info("Samsung CPU ID: 0x%08lx\n", exynos_cpu_id);
106
107 }
108
109 /*
110 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
111 * and suspend.
112 *
113 * This is necessary only on Exynos4 SoCs. When system is running
114 * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
115 * feature could properly detect global idle state when secondary CPU is
116 * powered down.
117 *
118 * However this should not be set when such system is going into suspend.
119 */
exynos_set_delayed_reset_assertion(bool enable)120 void exynos_set_delayed_reset_assertion(bool enable)
121 {
122 if (of_machine_is_compatible("samsung,exynos4")) {
123 unsigned int tmp, core_id;
124
125 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
126 tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
127 if (enable)
128 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
129 else
130 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
131 pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
132 }
133 }
134 }
135
136 /*
137 * Apparently, these SoCs are not able to wake-up from suspend using
138 * the PMU. Too bad. Should they suddenly become capable of such a
139 * feat, the matches below should be moved to suspend.c.
140 */
141 static const struct of_device_id exynos_dt_pmu_match[] = {
142 { .compatible = "samsung,exynos5260-pmu" },
143 { .compatible = "samsung,exynos5410-pmu" },
144 { /*sentinel*/ },
145 };
146
exynos_map_pmu(void)147 static void exynos_map_pmu(void)
148 {
149 struct device_node *np;
150
151 np = of_find_matching_node(NULL, exynos_dt_pmu_match);
152 if (np)
153 pmu_base_addr = of_iomap(np, 0);
154 of_node_put(np);
155 }
156
exynos_init_irq(void)157 static void __init exynos_init_irq(void)
158 {
159 irqchip_init();
160 /*
161 * Since platsmp.c needs pmu base address by the time
162 * DT is not unflatten so we can't use DT APIs before
163 * init_irq
164 */
165 exynos_map_pmu();
166 }
167
exynos_dt_machine_init(void)168 static void __init exynos_dt_machine_init(void)
169 {
170 /*
171 * This is called from smp_prepare_cpus if we've built for SMP, but
172 * we still need to set it up for PM and firmware ops if not.
173 */
174 if (!IS_ENABLED(CONFIG_SMP))
175 exynos_sysram_init();
176
177 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
178 if (of_machine_is_compatible("samsung,exynos4210") ||
179 of_machine_is_compatible("samsung,exynos3250"))
180 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
181 #endif
182 if (of_machine_is_compatible("samsung,exynos4210") ||
183 of_machine_is_compatible("samsung,exynos4212") ||
184 (of_machine_is_compatible("samsung,exynos4412") &&
185 (of_machine_is_compatible("samsung,trats2") ||
186 of_machine_is_compatible("samsung,midas") ||
187 of_machine_is_compatible("samsung,p4note"))) ||
188 of_machine_is_compatible("samsung,exynos3250") ||
189 of_machine_is_compatible("samsung,exynos5250"))
190 platform_device_register(&exynos_cpuidle);
191 }
192
193 static char const *const exynos_dt_compat[] __initconst = {
194 "samsung,exynos3",
195 "samsung,exynos3250",
196 "samsung,exynos4",
197 "samsung,exynos4210",
198 "samsung,exynos4212",
199 "samsung,exynos4412",
200 "samsung,exynos5",
201 "samsung,exynos5250",
202 "samsung,exynos5260",
203 "samsung,exynos5420",
204 NULL
205 };
206
exynos_dt_fixup(void)207 static void __init exynos_dt_fixup(void)
208 {
209 /*
210 * Some versions of uboot pass garbage entries in the memory node,
211 * use the old CONFIG_ARM_NR_BANKS
212 */
213 of_fdt_limit_memory(8);
214 }
215
216 DT_MACHINE_START(EXYNOS_DT, "Samsung Exynos (Flattened Device Tree)")
217 .l2c_aux_val = 0x08400000,
218 .l2c_aux_mask = 0xf60fffff,
219 .smp = smp_ops(exynos_smp_ops),
220 .map_io = exynos_init_io,
221 .init_early = exynos_firmware_init,
222 .init_irq = exynos_init_irq,
223 .init_machine = exynos_dt_machine_init,
224 .init_late = exynos_pm_init,
225 .dt_compat = exynos_dt_compat,
226 .dt_fixup = exynos_dt_fixup,
227 MACHINE_END
228