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_COREPERI_BASE
,
34 .pfn
= __phys_to_pfn(EXYNOS4_PA_COREPERI
),
40 static struct platform_device exynos_cpuidle
= {
41 .name
= "exynos_cpuidle",
42 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
43 .dev
.platform_data
= exynos_enter_aftr
,
48 void __iomem
*sysram_base_addr
;
49 void __iomem
*sysram_ns_base_addr
;
51 void __init
exynos_sysram_init(void)
53 struct device_node
*node
;
55 for_each_compatible_node(node
, NULL
, "samsung,exynos4210-sysram") {
56 if (!of_device_is_available(node
))
58 sysram_base_addr
= of_iomap(node
, 0);
62 for_each_compatible_node(node
, NULL
, "samsung,exynos4210-sysram-ns") {
63 if (!of_device_is_available(node
))
65 sysram_ns_base_addr
= of_iomap(node
, 0);
70 static void __init
exynos_init_late(void)
72 if (of_machine_is_compatible("samsung,exynos5440"))
73 /* to be supported later */
79 static int __init
exynos_fdt_map_chipid(unsigned long node
, const char *uname
,
80 int depth
, void *data
)
82 struct map_desc iodesc
;
86 if (!of_flat_dt_is_compatible(node
, "samsung,exynos4210-chipid") &&
87 !of_flat_dt_is_compatible(node
, "samsung,exynos5440-clock"))
90 reg
= of_get_flat_dt_prop(node
, "reg", &len
);
91 if (reg
== NULL
|| len
!= (sizeof(unsigned long) * 2))
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);
105 * register the standard cpu IO areas
107 static void __init
exynos_map_io(void)
109 if (soc_is_exynos4())
110 iotable_init(exynos4_iodesc
, ARRAY_SIZE(exynos4_iodesc
));
113 static void __init
exynos_init_io(void)
117 of_scan_flat_dt(exynos_fdt_map_chipid
, NULL
);
119 /* detect cpu id and rev. */
120 s5p_init_cpu(S5P_VA_CHIPID
);
126 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
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
134 * However this should not be set when such system is going into suspend.
136 void exynos_set_delayed_reset_assertion(bool enable
)
138 if (of_machine_is_compatible("samsung,exynos4")) {
139 unsigned int tmp
, core_id
;
141 for (core_id
= 0; core_id
< num_possible_cpus(); core_id
++) {
142 tmp
= pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id
));
144 tmp
|= S5P_USE_DELAYED_RESET_ASSERTION
;
146 tmp
&= ~(S5P_USE_DELAYED_RESET_ASSERTION
);
147 pmu_raw_writel(tmp
, EXYNOS_ARM_CORE_OPTION(core_id
));
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.
157 static const struct of_device_id exynos_dt_pmu_match
[] = {
158 { .compatible
= "samsung,exynos5260-pmu" },
159 { .compatible
= "samsung,exynos5410-pmu" },
163 static void exynos_map_pmu(void)
165 struct device_node
*np
;
167 np
= of_find_matching_node(NULL
, exynos_dt_pmu_match
);
169 pmu_base_addr
= of_iomap(np
, 0);
172 static void __init
exynos_init_irq(void)
176 * Since platsmp.c needs pmu base address by the time
177 * DT is not unflatten so we can't use DT APIs before
183 static void __init
exynos_dt_machine_init(void)
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.
189 if (!IS_ENABLED(CONFIG_SMP
))
190 exynos_sysram_init();
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
;
197 if (of_machine_is_compatible("samsung,exynos4210") ||
198 of_machine_is_compatible("samsung,exynos4212") ||
199 (of_machine_is_compatible("samsung,exynos4412") &&
200 of_machine_is_compatible("samsung,trats2")) ||
201 of_machine_is_compatible("samsung,exynos3250") ||
202 of_machine_is_compatible("samsung,exynos5250"))
203 platform_device_register(&exynos_cpuidle
);
206 static char const *const exynos_dt_compat
[] __initconst
= {
208 "samsung,exynos3250",
210 "samsung,exynos4210",
211 "samsung,exynos4212",
212 "samsung,exynos4412",
213 "samsung,exynos4415",
215 "samsung,exynos5250",
216 "samsung,exynos5260",
217 "samsung,exynos5420",
218 "samsung,exynos5440",
222 static void __init
exynos_dt_fixup(void)
225 * Some versions of uboot pass garbage entries in the memory node,
226 * use the old CONFIG_ARM_NR_BANKS
228 of_fdt_limit_memory(8);
231 DT_MACHINE_START(EXYNOS_DT
, "SAMSUNG EXYNOS (Flattened Device Tree)")
232 /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
233 /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
234 .l2c_aux_val
= 0x3c400001,
235 .l2c_aux_mask
= 0xc20fffff,
236 .smp
= smp_ops(exynos_smp_ops
),
237 .map_io
= exynos_init_io
,
238 .init_early
= exynos_firmware_init
,
239 .init_irq
= exynos_init_irq
,
240 .init_machine
= exynos_dt_machine_init
,
241 .init_late
= exynos_init_late
,
242 .dt_compat
= exynos_dt_compat
,
243 .dt_fixup
= exynos_dt_fixup
,