Resguardo inicial

linux-7.2.3/arch/arm/mach-sti/Kconfig

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+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig ARCH_STI
+	bool "STMicroelectronics Consumer Electronics SOCs"
+	depends on ARCH_MULTI_V7
+	select ARM_GIC
+	select ST_IRQCHIP
+	select ARM_GLOBAL_TIMER
+	select CLKSRC_ST_LPC
+	select PINCTRL
+	select PINCTRL_ST
+	select MFD_SYSCON
+	select ARCH_HAS_RESET_CONTROLLER
+	select HAVE_ARM_SCU if SMP
+	select GPIOLIB
+	select ARM_ERRATA_754322
+	select ARM_ERRATA_764369 if SMP
+	select ARM_ERRATA_775420
+	select PL310_ERRATA_753970 if CACHE_L2X0
+	select PL310_ERRATA_769419 if CACHE_L2X0
+	select RESET_CONTROLLER
+	help
+	  Include support for STMicroelectronics' STiH407/10 and
+	  STiH418 family SoCs using the Device Tree for discovery.  More
+	  information can be found in Documentation/arch/arm/sti/ and
+	  Documentation/devicetree.
+
+if ARCH_STI
+
+config SOC_STIH407
+	bool "STiH407 STMicroelectronics Consumer Electronics family"
+	default y
+	select STIH407_RESET
+	help
+	  This enables support for STMicroelectronics Digital Consumer
+	  Electronics family StiH407 parts, targetted at set-top-box
+	  and other digital audio/video applications using Flattened Device
+	  Trees.
+
+endif

linux-7.2.3/arch/arm/mach-sti/Makefile

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+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_SMP)		+= platsmp.o
+obj-$(CONFIG_ARCH_STI) 		+= board-dt.o

linux-7.2.3/arch/arm/mach-sti/board-dt.c

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+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
+ * Author(s): Srinivas Kandagatla <srinivas.kandagatla@st.com>
+ */
+
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/mach/arch.h>
+
+#include "smp.h"
+
+static const char *const stih41x_dt_match[] __initconst = {
+	"st,stih407",
+	"st,stih410",
+	"st,stih418",
+	NULL
+};
+
+DT_MACHINE_START(STM, "STi SoC with Flattened Device Tree")
+	.dt_compat	= stih41x_dt_match,
+	.l2c_aux_val	= L2C_AUX_CTRL_SHARED_OVERRIDE |
+			  L310_AUX_CTRL_DATA_PREFETCH |
+			  L310_AUX_CTRL_INSTR_PREFETCH |
+			  L2C_AUX_CTRL_WAY_SIZE(4),
+	.l2c_aux_mask	= 0xc0000fff,
+	.smp		= smp_ops(sti_smp_ops),
+MACHINE_END

linux-7.2.3/arch/arm/mach-sti/platsmp.c

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+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  arch/arm/mach-sti/platsmp.c
+ *
+ * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
+ *		http://www.st.com
+ *
+ * Cloned from linux/arch/arm/mach-vexpress/platsmp.c
+ *
+ *  Copyright (C) 2002 ARM Ltd.
+ *  All Rights Reserved
+ */
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/memblock.h>
+
+#include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
+#include <asm/smp_scu.h>
+
+#include "smp.h"
+
+static u32 __iomem *cpu_strt_ptr;
+
+static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	unsigned long entry_pa = __pa_symbol(secondary_startup);
+
+	/*
+	 * Secondary CPU is initialised and started by a U-BOOTROM firmware.
+	 * Secondary CPU is spinning and waiting for a write at cpu_strt_ptr.
+	 * Writing secondary_startup address at cpu_strt_ptr makes it to
+	 * jump directly to secondary_startup().
+	 */
+	__raw_writel(entry_pa, cpu_strt_ptr);
+
+	/* wmb so that data is actually written before cache flush is done */
+	smp_wmb();
+	sync_cache_w(cpu_strt_ptr);
+
+	return 0;
+}
+
+static void __init sti_smp_prepare_cpus(unsigned int max_cpus)
+{
+	struct device_node *np;
+	void __iomem *scu_base;
+	u32 release_phys;
+	int cpu;
+
+	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
+
+	if (np) {
+		scu_base = of_iomap(np, 0);
+		scu_enable(scu_base);
+		of_node_put(np);
+	}
+
+	if (max_cpus <= 1)
+		return;
+
+	for_each_possible_cpu(cpu) {
+
+		np = of_get_cpu_node(cpu, NULL);
+
+		if (!np)
+			continue;
+
+		if (of_property_read_u32(np, "cpu-release-addr",
+						&release_phys)) {
+			pr_err("CPU %d: missing or invalid cpu-release-addr "
+				"property\n", cpu);
+			continue;
+		}
+
+		/*
+		 * cpu-release-addr is usually configured in SBC DMEM but can
+		 * also be in RAM.
+		 */
+
+		if (!memblock_is_memory(release_phys))
+			cpu_strt_ptr =
+				ioremap(release_phys, sizeof(release_phys));
+		else
+			cpu_strt_ptr =
+				(u32 __iomem *)phys_to_virt(release_phys);
+
+		set_cpu_possible(cpu, true);
+	}
+}
+
+const struct smp_operations sti_smp_ops __initconst = {
+	.smp_prepare_cpus	= sti_smp_prepare_cpus,
+	.smp_boot_secondary	= sti_boot_secondary,
+};

linux-7.2.3/arch/arm/mach-sti/smp.h

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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  arch/arm/mach-sti/smp.h
+ *
+ * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
+ *		http://www.st.com
+ */
+
+#ifndef __MACH_STI_SMP_H
+#define __MACH_STI_SMP_H
+
+extern const struct smp_operations sti_smp_ops;
+
+void sti_secondary_startup(void);
+
+#endif