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 if (!of_device_is_available(node))
54 continue;
55 sysram_base_addr = of_iomap(node, 0);
56 sysram_base_phys = of_translate_address(node,
57 of_get_address(node, 0, NULL, NULL));
58 of_node_put(node);
59 break;
60 }
61
62 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
63 if (!of_device_is_available(node))
64 continue;
65 sysram_ns_base_addr = of_iomap(node, 0);
66 of_node_put(node);
67 break;
68 }
69 }
70
exynos_fdt_map_chipid(unsigned long node,const char * uname,int depth,void * data)71 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
72 int depth, void *data)
73 {
74 struct map_desc iodesc;
75 const __be32 *reg;
76 int len;
77
78 if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid"))
79 return 0;
80
81 reg = of_get_flat_dt_prop(node, "reg", &len);
82 if (reg == NULL || len != (sizeof(unsigned long) * 2))
83 return 0;
84
85 iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
86 iodesc.length = be32_to_cpu(reg[1]) - 1;
87 iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
88 iodesc.type = MT_DEVICE;
89 iotable_init(&iodesc, 1);
90 return 1;
91 }
92
exynos_init_io(void)93 static void __init exynos_init_io(void)
94 {
95 debug_ll_io_init();
96
97 of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
98
99 /* detect cpu id and rev. */
100 exynos_cpu_id = readl_relaxed(S5P_VA_CHIPID);
101 exynos_cpu_rev = exynos_cpu_id & 0xFF;
102
103 pr_info("Samsung CPU ID: 0x%08lx\n", exynos_cpu_id);
104
105 }
106
107 /*
108 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
109 * and suspend.
110 *
111 * This is necessary only on Exynos4 SoCs. When system is running
112 * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
113 * feature could properly detect global idle state when secondary CPU is
114 * powered down.
115 *
116 * However this should not be set when such system is going into suspend.
117 */
exynos_set_delayed_reset_assertion(bool enable)118 void exynos_set_delayed_reset_assertion(bool enable)
119 {
120 if (of_machine_is_compatible("samsung,exynos4")) {
121 unsigned int tmp, core_id;
122
123 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
124 tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
125 if (enable)
126 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
127 else
128 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
129 pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
130 }
131 }
132 }
133
134 /*
135 * Apparently, these SoCs are not able to wake-up from suspend using
136 * the PMU. Too bad. Should they suddenly become capable of such a
137 * feat, the matches below should be moved to suspend.c.
138 */
139 static const struct of_device_id exynos_dt_pmu_match[] = {
140 { .compatible = "samsung,exynos5260-pmu" },
141 { .compatible = "samsung,exynos5410-pmu" },
142 { /*sentinel*/ },
143 };
144
exynos_map_pmu(void)145 static void exynos_map_pmu(void)
146 {
147 struct device_node *np;
148
149 np = of_find_matching_node(NULL, exynos_dt_pmu_match);
150 if (np)
151 pmu_base_addr = of_iomap(np, 0);
152 of_node_put(np);
153 }
154
exynos_init_irq(void)155 static void __init exynos_init_irq(void)
156 {
157 irqchip_init();
158 /*
159 * Since platsmp.c needs pmu base address by the time
160 * DT is not unflatten so we can't use DT APIs before
161 * init_irq
162 */
163 exynos_map_pmu();
164 }
165
exynos_dt_machine_init(void)166 static void __init exynos_dt_machine_init(void)
167 {
168 /*
169 * This is called from smp_prepare_cpus if we've built for SMP, but
170 * we still need to set it up for PM and firmware ops if not.
171 */
172 if (!IS_ENABLED(CONFIG_SMP))
173 exynos_sysram_init();
174
175 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
176 if (of_machine_is_compatible("samsung,exynos4210") ||
177 of_machine_is_compatible("samsung,exynos3250"))
178 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
179 #endif
180 if (of_machine_is_compatible("samsung,exynos4210") ||
181 (of_machine_is_compatible("samsung,exynos4412") &&
182 (of_machine_is_compatible("samsung,trats2") ||
183 of_machine_is_compatible("samsung,midas") ||
184 of_machine_is_compatible("samsung,p4note"))) ||
185 of_machine_is_compatible("samsung,exynos3250") ||
186 of_machine_is_compatible("samsung,exynos5250"))
187 platform_device_register(&exynos_cpuidle);
188 }
189
190 static char const *const exynos_dt_compat[] __initconst = {
191 "samsung,exynos3",
192 "samsung,exynos3250",
193 "samsung,exynos4",
194 "samsung,exynos4210",
195 "samsung,exynos4412",
196 "samsung,exynos5",
197 "samsung,exynos5250",
198 "samsung,exynos5260",
199 "samsung,exynos5420",
200 NULL
201 };
202
exynos_dt_fixup(void)203 static void __init exynos_dt_fixup(void)
204 {
205 /*
206 * Some versions of uboot pass garbage entries in the memory node,
207 * use the old CONFIG_ARM_NR_BANKS
208 */
209 of_fdt_limit_memory(8);
210 }
211
212 DT_MACHINE_START(EXYNOS_DT, "Samsung Exynos (Flattened Device Tree)")
213 .l2c_aux_val = 0x08400000,
214 .l2c_aux_mask = 0xf60fffff,
215 .smp = smp_ops(exynos_smp_ops),
216 .map_io = exynos_init_io,
217 .init_early = exynos_firmware_init,
218 .init_irq = exynos_init_irq,
219 .init_machine = exynos_dt_machine_init,
220 .init_late = exynos_pm_init,
221 .dt_compat = exynos_dt_compat,
222 .dt_fixup = exynos_dt_fixup,
223 MACHINE_END
224