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 }
153 
exynos_init_irq(void)154 static void __init exynos_init_irq(void)
155 {
156 	irqchip_init();
157 	/*
158 	 * Since platsmp.c needs pmu base address by the time
159 	 * DT is not unflatten so we can't use DT APIs before
160 	 * init_irq
161 	 */
162 	exynos_map_pmu();
163 }
164 
exynos_dt_machine_init(void)165 static void __init exynos_dt_machine_init(void)
166 {
167 	/*
168 	 * This is called from smp_prepare_cpus if we've built for SMP, but
169 	 * we still need to set it up for PM and firmware ops if not.
170 	 */
171 	if (!IS_ENABLED(CONFIG_SMP))
172 		exynos_sysram_init();
173 
174 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
175 	if (of_machine_is_compatible("samsung,exynos4210") ||
176 	    of_machine_is_compatible("samsung,exynos3250"))
177 		exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
178 #endif
179 	if (of_machine_is_compatible("samsung,exynos4210") ||
180 	    (of_machine_is_compatible("samsung,exynos4412") &&
181 	     (of_machine_is_compatible("samsung,trats2") ||
182 		  of_machine_is_compatible("samsung,midas") ||
183 		  of_machine_is_compatible("samsung,p4note"))) ||
184 	    of_machine_is_compatible("samsung,exynos3250") ||
185 	    of_machine_is_compatible("samsung,exynos5250"))
186 		platform_device_register(&exynos_cpuidle);
187 }
188 
189 static char const *const exynos_dt_compat[] __initconst = {
190 	"samsung,exynos3",
191 	"samsung,exynos3250",
192 	"samsung,exynos4",
193 	"samsung,exynos4210",
194 	"samsung,exynos4412",
195 	"samsung,exynos5",
196 	"samsung,exynos5250",
197 	"samsung,exynos5260",
198 	"samsung,exynos5420",
199 	NULL
200 };
201 
exynos_dt_fixup(void)202 static void __init exynos_dt_fixup(void)
203 {
204 	/*
205 	 * Some versions of uboot pass garbage entries in the memory node,
206 	 * use the old CONFIG_ARM_NR_BANKS
207 	 */
208 	of_fdt_limit_memory(8);
209 }
210 
211 DT_MACHINE_START(EXYNOS_DT, "Samsung Exynos (Flattened Device Tree)")
212 	.l2c_aux_val	= 0x08400000,
213 	.l2c_aux_mask	= 0xf60fffff,
214 	.smp		= smp_ops(exynos_smp_ops),
215 	.map_io		= exynos_init_io,
216 	.init_early	= exynos_firmware_init,
217 	.init_irq	= exynos_init_irq,
218 	.init_machine	= exynos_dt_machine_init,
219 	.init_late	= exynos_pm_init,
220 	.dt_compat	= exynos_dt_compat,
221 	.dt_fixup	= exynos_dt_fixup,
222 MACHINE_END
223