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>
14 #include <linux/kernel.h>
15 #include <linux/serial_s3c.h>
17 #include <linux/of_address.h>
18 #include <linux/of_fdt.h>
19 #include <linux/of_platform.h>
20 #include <linux/platform_device.h>
21 #include <linux/pm_domain.h>
22 #include <linux/irqchip.h>
24 #include <asm/cacheflush.h>
25 #include <asm/hardware/cache-l2x0.h>
26 #include <asm/mach/arch.h>
27 #include <asm/mach/map.h>
28 #include <asm/memory.h>
36 void __iomem *pmu_base_addr;
38 static struct map_desc exynos4_iodesc[] __initdata = {
40 .virtual = (unsigned long)S5P_VA_CMU,
41 .pfn = __phys_to_pfn(EXYNOS4_PA_CMU),
45 .virtual = (unsigned long)S5P_VA_COREPERI_BASE,
46 .pfn = __phys_to_pfn(EXYNOS4_PA_COREPERI),
50 .virtual = (unsigned long)S5P_VA_DMC0,
51 .pfn = __phys_to_pfn(EXYNOS4_PA_DMC0),
55 .virtual = (unsigned long)S5P_VA_DMC1,
56 .pfn = __phys_to_pfn(EXYNOS4_PA_DMC1),
62 static struct platform_device exynos_cpuidle = {
63 .name = "exynos_cpuidle",
64 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
65 .dev.platform_data = exynos_enter_aftr,
70 void __iomem *sysram_base_addr;
71 void __iomem *sysram_ns_base_addr;
73 void __init exynos_sysram_init(void)
75 struct device_node *node;
77 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
78 if (!of_device_is_available(node))
80 sysram_base_addr = of_iomap(node, 0);
84 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
85 if (!of_device_is_available(node))
87 sysram_ns_base_addr = of_iomap(node, 0);
92 static void __init exynos_init_late(void)
94 if (of_machine_is_compatible("samsung,exynos5440"))
95 /* to be supported later */
101 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
102 int depth, void *data)
104 struct map_desc iodesc;
108 if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
109 !of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
112 reg = of_get_flat_dt_prop(node, "reg", &len);
113 if (reg == NULL || len != (sizeof(unsigned long) * 2))
116 iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
117 iodesc.length = be32_to_cpu(reg[1]) - 1;
118 iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
119 iodesc.type = MT_DEVICE;
120 iotable_init(&iodesc, 1);
127 * register the standard cpu IO areas
129 static void __init exynos_map_io(void)
131 if (soc_is_exynos4())
132 iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
135 static void __init exynos_init_io(void)
139 of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
141 /* detect cpu id and rev. */
142 s5p_init_cpu(S5P_VA_CHIPID);
148 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
151 * This is necessary only on Exynos4 SoCs. When system is running
152 * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
153 * feature could properly detect global idle state when secondary CPU is
156 * However this should not be set when such system is going into suspend.
158 void exynos_set_delayed_reset_assertion(bool enable)
160 if (of_machine_is_compatible("samsung,exynos4")) {
161 unsigned int tmp, core_id;
163 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
164 tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
166 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
168 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
169 pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
175 * Apparently, these SoCs are not able to wake-up from suspend using
176 * the PMU. Too bad. Should they suddenly become capable of such a
177 * feat, the matches below should be moved to suspend.c.
179 static const struct of_device_id exynos_dt_pmu_match[] = {
180 { .compatible = "samsung,exynos5260-pmu" },
181 { .compatible = "samsung,exynos5410-pmu" },
185 static void exynos_map_pmu(void)
187 struct device_node *np;
189 np = of_find_matching_node(NULL, exynos_dt_pmu_match);
191 pmu_base_addr = of_iomap(np, 0);
194 static void __init exynos_init_irq(void)
198 * Since platsmp.c needs pmu base address by the time
199 * DT is not unflatten so we can't use DT APIs before
205 static const struct of_device_id exynos_cpufreq_matches[] = {
206 { .compatible = "samsung,exynos3250", .data = "cpufreq-dt" },
207 { .compatible = "samsung,exynos4210", .data = "cpufreq-dt" },
208 { .compatible = "samsung,exynos4212", .data = "cpufreq-dt" },
209 { .compatible = "samsung,exynos4412", .data = "cpufreq-dt" },
210 { .compatible = "samsung,exynos5250", .data = "cpufreq-dt" },
214 static void __init exynos_cpufreq_init(void)
216 struct device_node *root = of_find_node_by_path("/");
217 const struct of_device_id *match;
219 match = of_match_node(exynos_cpufreq_matches, root);
221 platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
225 platform_device_register_simple(match->data, -1, NULL, 0);
228 static void __init exynos_dt_machine_init(void)
231 * This is called from smp_prepare_cpus if we've built for SMP, but
232 * we still need to set it up for PM and firmware ops if not.
234 if (!IS_ENABLED(CONFIG_SMP))
235 exynos_sysram_init();
237 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
238 if (of_machine_is_compatible("samsung,exynos4210") ||
239 of_machine_is_compatible("samsung,exynos3250"))
240 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
242 if (of_machine_is_compatible("samsung,exynos4210") ||
243 of_machine_is_compatible("samsung,exynos4212") ||
244 (of_machine_is_compatible("samsung,exynos4412") &&
245 of_machine_is_compatible("samsung,trats2")) ||
246 of_machine_is_compatible("samsung,exynos3250") ||
247 of_machine_is_compatible("samsung,exynos5250"))
248 platform_device_register(&exynos_cpuidle);
250 exynos_cpufreq_init();
252 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
255 static char const *const exynos_dt_compat[] __initconst = {
257 "samsung,exynos3250",
259 "samsung,exynos4210",
260 "samsung,exynos4212",
261 "samsung,exynos4412",
262 "samsung,exynos4415",
264 "samsung,exynos5250",
265 "samsung,exynos5260",
266 "samsung,exynos5420",
267 "samsung,exynos5440",
271 static void __init exynos_reserve(void)
273 #ifdef CONFIG_S5P_DEV_MFC
282 for (i = 0; i < ARRAY_SIZE(mfc_mem); i++)
283 if (of_scan_flat_dt(s5p_fdt_alloc_mfc_mem, mfc_mem[i]))
288 static void __init exynos_dt_fixup(void)
291 * Some versions of uboot pass garbage entries in the memory node,
292 * use the old CONFIG_ARM_NR_BANKS
294 of_fdt_limit_memory(8);
297 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
298 /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
299 /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
300 .l2c_aux_val = 0x3c400001,
301 .l2c_aux_mask = 0xc20fffff,
302 .smp = smp_ops(exynos_smp_ops),
303 .map_io = exynos_init_io,
304 .init_early = exynos_firmware_init,
305 .init_irq = exynos_init_irq,
306 .init_machine = exynos_dt_machine_init,
307 .init_late = exynos_init_late,
308 .dt_compat = exynos_dt_compat,
309 .reserve = exynos_reserve,
310 .dt_fixup = exynos_dt_fixup,