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
 28static 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
 36void __iomem *sysram_base_addr __ro_after_init;
 37phys_addr_t sysram_base_phys __ro_after_init;
 38void __iomem *sysram_ns_base_addr __ro_after_init;
 39
 40unsigned long exynos_cpu_id;
 41static unsigned int exynos_cpu_rev;
 42
 43unsigned int exynos_rev(void)
 44{
 45	return exynos_cpu_rev;
 46}
 47
 48void __init exynos_sysram_init(void)
 49{
 50	struct device_node *node;
 51
 52	for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
 53		struct resource res;
 54		if (!of_device_is_available(node))
 55			continue;
 56
 57		of_address_to_resource(node, 0, &res);
 58		sysram_base_addr = ioremap(res.start, resource_size(&res));
 59		sysram_base_phys = res.start;
 60		of_node_put(node);
 61		break;
 62	}
 63
 64	for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
 65		if (!of_device_is_available(node))
 66			continue;
 67		sysram_ns_base_addr = of_iomap(node, 0);
 68		of_node_put(node);
 69		break;
 70	}
 71}
 72
 73static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
 74					int depth, void *data)
 75{
 76	struct map_desc iodesc;
 77	const __be32 *reg;
 78	int len;
 79
 80	if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid"))
 81		return 0;
 82
 83	reg = of_get_flat_dt_prop(node, "reg", &len);
 84	if (reg == NULL || len != (sizeof(unsigned long) * 2))
 85		return 0;
 86
 87	iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
 88	iodesc.length = be32_to_cpu(reg[1]) - 1;
 89	iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
 90	iodesc.type = MT_DEVICE;
 91	iotable_init(&iodesc, 1);
 92	return 1;
 93}
 94
 95static void __init exynos_init_io(void)
 96{
 97	debug_ll_io_init();
 98
 99	of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
100
101	/* detect cpu id and rev. */
102	exynos_cpu_id = readl_relaxed(S5P_VA_CHIPID);
103	exynos_cpu_rev = exynos_cpu_id & 0xFF;
104
105	pr_info("Samsung CPU ID: 0x%08lx\n", exynos_cpu_id);
106
107}
108
109/*
110 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
111 * and suspend.
112 *
113 * This is necessary only on Exynos4 SoCs. When system is running
114 * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
115 * feature could properly detect global idle state when secondary CPU is
116 * powered down.
117 *
118 * However this should not be set when such system is going into suspend.
119 */
120void exynos_set_delayed_reset_assertion(bool enable)
121{
122	if (of_machine_is_compatible("samsung,exynos4")) {
123		unsigned int tmp, core_id;
124
125		for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
126			tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
127			if (enable)
128				tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
129			else
130				tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
131			pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
132		}
133	}
134}
135
136/*
137 * Apparently, these SoCs are not able to wake-up from suspend using
138 * the PMU. Too bad. Should they suddenly become capable of such a
139 * feat, the matches below should be moved to suspend.c.
140 */
141static const struct of_device_id exynos_dt_pmu_match[] = {
142	{ .compatible = "samsung,exynos5260-pmu" },
143	{ .compatible = "samsung,exynos5410-pmu" },
144	{ /*sentinel*/ },
145};
146
147static void exynos_map_pmu(void)
148{
149	struct device_node *np;
150
151	np = of_find_matching_node(NULL, exynos_dt_pmu_match);
152	if (np)
153		pmu_base_addr = of_iomap(np, 0);
154	of_node_put(np);
155}
156
157static void __init exynos_init_irq(void)
158{
159	irqchip_init();
160	/*
161	 * Since platsmp.c needs pmu base address by the time
162	 * DT is not unflatten so we can't use DT APIs before
163	 * init_irq
164	 */
165	exynos_map_pmu();
166}
167
168static void __init exynos_dt_machine_init(void)
169{
170	/*
171	 * This is called from smp_prepare_cpus if we've built for SMP, but
172	 * we still need to set it up for PM and firmware ops if not.
173	 */
174	if (!IS_ENABLED(CONFIG_SMP))
175		exynos_sysram_init();
176
177#if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
178	if (of_machine_is_compatible("samsung,exynos4210") ||
179	    of_machine_is_compatible("samsung,exynos3250"))
180		exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
181#endif
182	if (of_machine_is_compatible("samsung,exynos4210") ||
183	    of_machine_is_compatible("samsung,exynos4212") ||
184	    (of_machine_is_compatible("samsung,exynos4412") &&
185	     (of_machine_is_compatible("samsung,trats2") ||
186		  of_machine_is_compatible("samsung,midas") ||
187		  of_machine_is_compatible("samsung,p4note"))) ||
188	    of_machine_is_compatible("samsung,exynos3250") ||
189	    of_machine_is_compatible("samsung,exynos5250"))
190		platform_device_register(&exynos_cpuidle);
191}
192
193static char const *const exynos_dt_compat[] __initconst = {
194	"samsung,exynos3",
195	"samsung,exynos3250",
196	"samsung,exynos4",
197	"samsung,exynos4210",
198	"samsung,exynos4212",
199	"samsung,exynos4412",
200	"samsung,exynos5",
201	"samsung,exynos5250",
202	"samsung,exynos5260",
203	"samsung,exynos5420",
204	NULL
205};
206
207static void __init exynos_dt_fixup(void)
208{
209	/*
210	 * Some versions of uboot pass garbage entries in the memory node,
211	 * use the old CONFIG_ARM_NR_BANKS
212	 */
213	of_fdt_limit_memory(8);
214}
215
216DT_MACHINE_START(EXYNOS_DT, "Samsung Exynos (Flattened Device Tree)")
217	.l2c_aux_val	= 0x08400000,
218	.l2c_aux_mask	= 0xf60fffff,
219	.smp		= smp_ops(exynos_smp_ops),
220	.map_io		= exynos_init_io,
221	.init_early	= exynos_firmware_init,
222	.init_irq	= exynos_init_irq,
223	.init_machine	= exynos_dt_machine_init,
224	.init_late	= exynos_pm_init,
225	.dt_compat	= exynos_dt_compat,
226	.dt_fixup	= exynos_dt_fixup,
227MACHINE_END