2 * SAMSUNG EXYNOS Flattened Device Tree enabled machine
4 * Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
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.
12 #include <linux/init.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>
21 #include <asm/cacheflush.h>
22 #include <asm/hardware/cache-l2x0.h>
23 #include <asm/mach/arch.h>
24 #include <asm/mach/map.h>
31 static struct map_desc exynos4_iodesc
[] __initdata
= {
33 .virtual = (unsigned long)S5P_VA_CMU
,
34 .pfn
= __phys_to_pfn(EXYNOS4_PA_CMU
),
38 .virtual = (unsigned long)S5P_VA_COREPERI_BASE
,
39 .pfn
= __phys_to_pfn(EXYNOS4_PA_COREPERI
),
43 .virtual = (unsigned long)S5P_VA_DMC0
,
44 .pfn
= __phys_to_pfn(EXYNOS4_PA_DMC0
),
48 .virtual = (unsigned long)S5P_VA_DMC1
,
49 .pfn
= __phys_to_pfn(EXYNOS4_PA_DMC1
),
55 static struct platform_device exynos_cpuidle
= {
56 .name
= "exynos_cpuidle",
57 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
58 .dev
.platform_data
= exynos_enter_aftr
,
63 void __iomem
*sysram_base_addr
;
64 void __iomem
*sysram_ns_base_addr
;
66 void __init
exynos_sysram_init(void)
68 struct device_node
*node
;
70 for_each_compatible_node(node
, NULL
, "samsung,exynos4210-sysram") {
71 if (!of_device_is_available(node
))
73 sysram_base_addr
= of_iomap(node
, 0);
77 for_each_compatible_node(node
, NULL
, "samsung,exynos4210-sysram-ns") {
78 if (!of_device_is_available(node
))
80 sysram_ns_base_addr
= of_iomap(node
, 0);
85 static void __init
exynos_init_late(void)
87 if (of_machine_is_compatible("samsung,exynos5440"))
88 /* to be supported later */
94 static int __init
exynos_fdt_map_chipid(unsigned long node
, const char *uname
,
95 int depth
, void *data
)
97 struct map_desc iodesc
;
101 if (!of_flat_dt_is_compatible(node
, "samsung,exynos4210-chipid") &&
102 !of_flat_dt_is_compatible(node
, "samsung,exynos5440-clock"))
105 reg
= of_get_flat_dt_prop(node
, "reg", &len
);
106 if (reg
== NULL
|| len
!= (sizeof(unsigned long) * 2))
109 iodesc
.pfn
= __phys_to_pfn(be32_to_cpu(reg
[0]));
110 iodesc
.length
= be32_to_cpu(reg
[1]) - 1;
111 iodesc
.virtual = (unsigned long)S5P_VA_CHIPID
;
112 iodesc
.type
= MT_DEVICE
;
113 iotable_init(&iodesc
, 1);
120 * register the standard cpu IO areas
122 static void __init
exynos_map_io(void)
124 if (soc_is_exynos4())
125 iotable_init(exynos4_iodesc
, ARRAY_SIZE(exynos4_iodesc
));
128 static void __init
exynos_init_io(void)
132 of_scan_flat_dt(exynos_fdt_map_chipid
, NULL
);
134 /* detect cpu id and rev. */
135 s5p_init_cpu(S5P_VA_CHIPID
);
141 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
144 * This is necessary only on Exynos4 SoCs. When system is running
145 * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
146 * feature could properly detect global idle state when secondary CPU is
149 * However this should not be set when such system is going into suspend.
151 void exynos_set_delayed_reset_assertion(bool enable
)
153 if (of_machine_is_compatible("samsung,exynos4")) {
154 unsigned int tmp
, core_id
;
156 for (core_id
= 0; core_id
< num_possible_cpus(); core_id
++) {
157 tmp
= pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id
));
159 tmp
|= S5P_USE_DELAYED_RESET_ASSERTION
;
161 tmp
&= ~(S5P_USE_DELAYED_RESET_ASSERTION
);
162 pmu_raw_writel(tmp
, EXYNOS_ARM_CORE_OPTION(core_id
));
168 * Apparently, these SoCs are not able to wake-up from suspend using
169 * the PMU. Too bad. Should they suddenly become capable of such a
170 * feat, the matches below should be moved to suspend.c.
172 static const struct of_device_id exynos_dt_pmu_match
[] = {
173 { .compatible
= "samsung,exynos5260-pmu" },
174 { .compatible
= "samsung,exynos5410-pmu" },
178 static void exynos_map_pmu(void)
180 struct device_node
*np
;
182 np
= of_find_matching_node(NULL
, exynos_dt_pmu_match
);
184 pmu_base_addr
= of_iomap(np
, 0);
187 static void __init
exynos_init_irq(void)
191 * Since platsmp.c needs pmu base address by the time
192 * DT is not unflatten so we can't use DT APIs before
198 static void __init
exynos_dt_machine_init(void)
201 * This is called from smp_prepare_cpus if we've built for SMP, but
202 * we still need to set it up for PM and firmware ops if not.
204 if (!IS_ENABLED(CONFIG_SMP
))
205 exynos_sysram_init();
207 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
208 if (of_machine_is_compatible("samsung,exynos4210") ||
209 of_machine_is_compatible("samsung,exynos3250"))
210 exynos_cpuidle
.dev
.platform_data
= &cpuidle_coupled_exynos_data
;
212 if (of_machine_is_compatible("samsung,exynos4210") ||
213 of_machine_is_compatible("samsung,exynos4212") ||
214 (of_machine_is_compatible("samsung,exynos4412") &&
215 of_machine_is_compatible("samsung,trats2")) ||
216 of_machine_is_compatible("samsung,exynos3250") ||
217 of_machine_is_compatible("samsung,exynos5250"))
218 platform_device_register(&exynos_cpuidle
);
221 static char const *const exynos_dt_compat
[] __initconst
= {
223 "samsung,exynos3250",
225 "samsung,exynos4210",
226 "samsung,exynos4212",
227 "samsung,exynos4412",
228 "samsung,exynos4415",
230 "samsung,exynos5250",
231 "samsung,exynos5260",
232 "samsung,exynos5420",
233 "samsung,exynos5440",
237 static void __init
exynos_dt_fixup(void)
240 * Some versions of uboot pass garbage entries in the memory node,
241 * use the old CONFIG_ARM_NR_BANKS
243 of_fdt_limit_memory(8);
246 DT_MACHINE_START(EXYNOS_DT
, "SAMSUNG EXYNOS (Flattened Device Tree)")
247 /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
248 /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
249 .l2c_aux_val
= 0x3c400001,
250 .l2c_aux_mask
= 0xc20fffff,
251 .smp
= smp_ops(exynos_smp_ops
),
252 .map_io
= exynos_init_io
,
253 .init_early
= exynos_firmware_init
,
254 .init_irq
= exynos_init_irq
,
255 .init_machine
= exynos_dt_machine_init
,
256 .init_late
= exynos_init_late
,
257 .dt_compat
= exynos_dt_compat
,
258 .dt_fixup
= exynos_dt_fixup
,