xref: /openbmc/linux/arch/arm/mach-exynos/exynos.c (revision 68198dca)
1 /*
2  * SAMSUNG EXYNOS Flattened Device Tree enabled machine
3  *
4  * Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
5  *		http://www.samsung.com
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 
12 #include <linux/init.h>
13 #include <linux/io.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16 #include <linux/of_fdt.h>
17 #include <linux/platform_device.h>
18 #include <linux/irqchip.h>
19 #include <linux/soc/samsung/exynos-regs-pmu.h>
20 
21 #include <asm/cacheflush.h>
22 #include <asm/hardware/cache-l2x0.h>
23 #include <asm/mach/arch.h>
24 #include <asm/mach/map.h>
25 
26 #include <mach/map.h>
27 #include <plat/cpu.h>
28 
29 #include "common.h"
30 
31 static struct map_desc exynos4_iodesc[] __initdata = {
32 	{
33 		.virtual	= (unsigned long)S5P_VA_COREPERI_BASE,
34 		.pfn		= __phys_to_pfn(EXYNOS4_PA_COREPERI),
35 		.length		= SZ_8K,
36 		.type		= MT_DEVICE,
37 	},
38 };
39 
40 static struct platform_device exynos_cpuidle = {
41 	.name              = "exynos_cpuidle",
42 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
43 	.dev.platform_data = exynos_enter_aftr,
44 #endif
45 	.id                = -1,
46 };
47 
48 void __iomem *sysram_base_addr __ro_after_init;
49 void __iomem *sysram_ns_base_addr __ro_after_init;
50 
51 void __init exynos_sysram_init(void)
52 {
53 	struct device_node *node;
54 
55 	for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
56 		if (!of_device_is_available(node))
57 			continue;
58 		sysram_base_addr = of_iomap(node, 0);
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 		break;
67 	}
68 }
69 
70 static void __init exynos_init_late(void)
71 {
72 	if (of_machine_is_compatible("samsung,exynos5440"))
73 		/* to be supported later */
74 		return;
75 
76 	exynos_pm_init();
77 }
78 
79 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
80 					int depth, void *data)
81 {
82 	struct map_desc iodesc;
83 	const __be32 *reg;
84 	int len;
85 
86 	if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
87 		!of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
88 		return 0;
89 
90 	reg = of_get_flat_dt_prop(node, "reg", &len);
91 	if (reg == NULL || len != (sizeof(unsigned long) * 2))
92 		return 0;
93 
94 	iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
95 	iodesc.length = be32_to_cpu(reg[1]) - 1;
96 	iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
97 	iodesc.type = MT_DEVICE;
98 	iotable_init(&iodesc, 1);
99 	return 1;
100 }
101 
102 /*
103  * exynos_map_io
104  *
105  * register the standard cpu IO areas
106  */
107 static void __init exynos_map_io(void)
108 {
109 	if (soc_is_exynos4())
110 		iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
111 }
112 
113 static void __init exynos_init_io(void)
114 {
115 	debug_ll_io_init();
116 
117 	of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
118 
119 	/* detect cpu id and rev. */
120 	s5p_init_cpu(S5P_VA_CHIPID);
121 
122 	exynos_map_io();
123 }
124 
125 /*
126  * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
127  * and suspend.
128  *
129  * This is necessary only on Exynos4 SoCs. When system is running
130  * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
131  * feature could properly detect global idle state when secondary CPU is
132  * powered down.
133  *
134  * However this should not be set when such system is going into suspend.
135  */
136 void exynos_set_delayed_reset_assertion(bool enable)
137 {
138 	if (of_machine_is_compatible("samsung,exynos4")) {
139 		unsigned int tmp, core_id;
140 
141 		for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
142 			tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
143 			if (enable)
144 				tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
145 			else
146 				tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
147 			pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
148 		}
149 	}
150 }
151 
152 /*
153  * Apparently, these SoCs are not able to wake-up from suspend using
154  * the PMU. Too bad. Should they suddenly become capable of such a
155  * feat, the matches below should be moved to suspend.c.
156  */
157 static const struct of_device_id exynos_dt_pmu_match[] = {
158 	{ .compatible = "samsung,exynos5260-pmu" },
159 	{ .compatible = "samsung,exynos5410-pmu" },
160 	{ /*sentinel*/ },
161 };
162 
163 static void exynos_map_pmu(void)
164 {
165 	struct device_node *np;
166 
167 	np = of_find_matching_node(NULL, exynos_dt_pmu_match);
168 	if (np)
169 		pmu_base_addr = of_iomap(np, 0);
170 }
171 
172 static void __init exynos_init_irq(void)
173 {
174 	irqchip_init();
175 	/*
176 	 * Since platsmp.c needs pmu base address by the time
177 	 * DT is not unflatten so we can't use DT APIs before
178 	 * init_irq
179 	 */
180 	exynos_map_pmu();
181 }
182 
183 static void __init exynos_dt_machine_init(void)
184 {
185 	/*
186 	 * This is called from smp_prepare_cpus if we've built for SMP, but
187 	 * we still need to set it up for PM and firmware ops if not.
188 	 */
189 	if (!IS_ENABLED(CONFIG_SMP))
190 		exynos_sysram_init();
191 
192 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
193 	if (of_machine_is_compatible("samsung,exynos4210") ||
194 	    of_machine_is_compatible("samsung,exynos3250"))
195 		exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
196 #endif
197 	if (of_machine_is_compatible("samsung,exynos4210") ||
198 	    (of_machine_is_compatible("samsung,exynos4412") &&
199 	     of_machine_is_compatible("samsung,trats2")) ||
200 	    of_machine_is_compatible("samsung,exynos3250") ||
201 	    of_machine_is_compatible("samsung,exynos5250"))
202 		platform_device_register(&exynos_cpuidle);
203 }
204 
205 static char const *const exynos_dt_compat[] __initconst = {
206 	"samsung,exynos3",
207 	"samsung,exynos3250",
208 	"samsung,exynos4",
209 	"samsung,exynos4210",
210 	"samsung,exynos4412",
211 	"samsung,exynos5",
212 	"samsung,exynos5250",
213 	"samsung,exynos5260",
214 	"samsung,exynos5420",
215 	"samsung,exynos5440",
216 	NULL
217 };
218 
219 static void __init exynos_dt_fixup(void)
220 {
221 	/*
222 	 * Some versions of uboot pass garbage entries in the memory node,
223 	 * use the old CONFIG_ARM_NR_BANKS
224 	 */
225 	of_fdt_limit_memory(8);
226 }
227 
228 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
229 	/* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
230 	/* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
231 	.l2c_aux_val	= 0x3c400001,
232 	.l2c_aux_mask	= 0xc20fffff,
233 	.smp		= smp_ops(exynos_smp_ops),
234 	.map_io		= exynos_init_io,
235 	.init_early	= exynos_firmware_init,
236 	.init_irq	= exynos_init_irq,
237 	.init_machine	= exynos_dt_machine_init,
238 	.init_late	= exynos_init_late,
239 	.dt_compat	= exynos_dt_compat,
240 	.dt_fixup	= exynos_dt_fixup,
241 MACHINE_END
242