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linux-7.2.3/arch/x86/platform/geode/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_GEODE_COMMON)	+= geode-common.o
+obj-$(CONFIG_ALIX)		+= alix.o
+obj-$(CONFIG_NET5501)		+= net5501.o
+obj-$(CONFIG_GEOS)		+= geos.o

linux-7.2.3/arch/x86/platform/geode/alix.c

@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * System Specific setup for PCEngines ALIX.
+ * At the moment this means setup of GPIO control of LEDs
+ * on Alix.2/3/6 boards.
+ *
+ * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
+ * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
+ *                and Philip Prindeville <philipp@redfish-solutions.com>
+ *
+ * TODO: There are large similarities with leds-net5501.c
+ * by Alessandro Zummo <a.zummo@towertech.it>
+ * In the future leds-net5501.c should be migrated over to platform
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/string.h>
+#include <linux/moduleparam.h>
+#include <linux/dmi.h>
+
+#include <asm/geode.h>
+
+#include "geode-common.h"
+
+#define BIOS_SIGNATURE_TINYBIOS		0xf0000
+#define BIOS_SIGNATURE_COREBOOT		0x500
+#define BIOS_REGION_SIZE		0x10000
+
+/*
+ * This driver is not modular, but to keep back compatibility
+ * with existing use cases, continuing with module_param is
+ * the easiest way forward.
+ */
+static bool force = 0;
+module_param(force, bool, 0444);
+/* FIXME: Award bios is not automatically detected as Alix platform */
+MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform");
+
+static const struct geode_led alix_leds[] __initconst = {
+	{ 6, true },
+	{ 25, false },
+	{ 27, false },
+};
+
+static void __init register_alix(void)
+{
+	geode_create_restart_key(24);
+	geode_create_leds("alix", alix_leds, ARRAY_SIZE(alix_leds));
+}
+
+static bool __init alix_present(unsigned long bios_phys,
+				const char *alix_sig,
+				size_t alix_sig_len)
+{
+	const size_t bios_len = BIOS_REGION_SIZE;
+	const char *bios_virt;
+	const char *scan_end;
+	const char *p;
+	char name[64];
+
+	if (force) {
+		printk(KERN_NOTICE "%s: forced to skip BIOS test, "
+		       "assume system is ALIX.2/ALIX.3\n",
+		       KBUILD_MODNAME);
+		return true;
+	}
+
+	bios_virt = phys_to_virt(bios_phys);
+	scan_end = bios_virt + bios_len - (alix_sig_len + 2);
+	for (p = bios_virt; p < scan_end; p++) {
+		const char *tail;
+		char *a;
+
+		if (memcmp(p, alix_sig, alix_sig_len) != 0)
+			continue;
+
+		memcpy(name, p, sizeof(name));
+
+		/* remove the first \0 character from string */
+		a = strchr(name, '\0');
+		if (a)
+			*a = ' ';
+
+		/* cut the string at a newline */
+		a = strchr(name, '\r');
+		if (a)
+			*a = '\0';
+
+		tail = p + alix_sig_len;
+		if ((tail[0] == '2' || tail[0] == '3' || tail[0] == '6')) {
+			printk(KERN_INFO
+			       "%s: system is recognized as \"%s\"\n",
+			       KBUILD_MODNAME, name);
+			return true;
+		}
+	}
+
+	return false;
+}
+
+static bool __init alix_present_dmi(void)
+{
+	const char *vendor, *product;
+
+	vendor = dmi_get_system_info(DMI_SYS_VENDOR);
+	if (!vendor || strcmp(vendor, "PC Engines"))
+		return false;
+
+	product = dmi_get_system_info(DMI_PRODUCT_NAME);
+	if (!product || (strcmp(product, "ALIX.2D") && strcmp(product, "ALIX.6")))
+		return false;
+
+	printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
+	       KBUILD_MODNAME, vendor, product);
+
+	return true;
+}
+
+static int __init alix_init(void)
+{
+	const char tinybios_sig[] = "PC Engines ALIX.";
+	const char coreboot_sig[] = "PC Engines\0ALIX.";
+
+	if (!is_geode())
+		return 0;
+
+	if (alix_present(BIOS_SIGNATURE_TINYBIOS, tinybios_sig, sizeof(tinybios_sig) - 1) ||
+	    alix_present(BIOS_SIGNATURE_COREBOOT, coreboot_sig, sizeof(coreboot_sig) - 1) ||
+	    alix_present_dmi())
+		register_alix();
+
+	return 0;
+}
+device_initcall(alix_init);

linux-7.2.3/arch/x86/platform/geode/geode-common.c

@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Shared helpers to register GPIO-connected buttons and LEDs
+ * on AMD Geode boards.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio/machine.h>
+#include <linux/gpio/property.h>
+#include <linux/input.h>
+#include <linux/leds.h>
+#include <linux/mfd/cs5535.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "geode-common.h"
+
+static const struct property_entry geode_gpio_keys_props[] = {
+	PROPERTY_ENTRY_U32("poll-interval", 20),
+	{ }
+};
+
+static const struct software_node geode_gpio_keys_node = {
+	.name = "geode-gpio-keys",
+	.properties = geode_gpio_keys_props,
+};
+
+static struct software_node_ref_args geode_restart_gpio_ref;
+
+static const struct property_entry geode_restart_key_props[] = {
+	PROPERTY_ENTRY_REF_ARRAY_LEN("gpios", &geode_restart_gpio_ref, 1),
+	PROPERTY_ENTRY_U32("linux,code", KEY_RESTART),
+	PROPERTY_ENTRY_STRING("label", "Reset button"),
+	PROPERTY_ENTRY_U32("debounce-interval", 100),
+	{ }
+};
+
+static const struct software_node geode_restart_key_node = {
+	.parent = &geode_gpio_keys_node,
+	.properties = geode_restart_key_props,
+};
+
+static const struct software_node *geode_gpio_keys_swnodes[] __initconst = {
+	&geode_gpio_keys_node,
+	&geode_restart_key_node,
+	NULL
+};
+
+/*
+ * Creates gpio-keys-polled device for the restart key.
+ *
+ * Note that it needs to be called first, before geode_create_leds(),
+ * because it registers gpiochip software node used by both gpio-keys and
+ * leds-gpio devices.
+ */
+int __init geode_create_restart_key(unsigned int pin)
+{
+	struct platform_device_info keys_info = {
+		.name	= "gpio-keys-polled",
+		.id	= 1,
+	};
+	struct platform_device *pd;
+	int err;
+
+	geode_restart_gpio_ref = SOFTWARE_NODE_REFERENCE(&cs5535_gpio_swnode,
+							 pin, GPIO_ACTIVE_LOW);
+
+	err = software_node_register_node_group(geode_gpio_keys_swnodes);
+	if (err) {
+		pr_err("failed to register gpio-keys software nodes: %d\n", err);
+		return err;
+	}
+
+	keys_info.fwnode = software_node_fwnode(&geode_gpio_keys_node);
+
+	pd = platform_device_register_full(&keys_info);
+	err = PTR_ERR_OR_ZERO(pd);
+	if (err) {
+		pr_err("failed to create gpio-keys device: %d\n", err);
+		software_node_unregister_node_group(geode_gpio_keys_swnodes);
+		return err;
+	}
+
+	return 0;
+}
+
+static const struct software_node geode_gpio_leds_node = {
+	.name = "geode-leds",
+};
+
+#define MAX_LEDS	3
+
+int __init geode_create_leds(const char *label, const struct geode_led *leds,
+			      unsigned int n_leds)
+{
+	const struct software_node *group[MAX_LEDS + 2] = { 0 };
+	struct software_node *swnodes;
+	struct property_entry *props;
+	struct software_node_ref_args *gpio_refs;
+	struct platform_device_info led_info = {
+		.name	= "leds-gpio",
+		.id	= PLATFORM_DEVID_NONE,
+	};
+	struct platform_device *led_dev;
+	const char *node_name;
+	int err;
+	int i;
+
+	if (n_leds > MAX_LEDS) {
+		pr_err("%s: too many LEDs\n", __func__);
+		return -EINVAL;
+	}
+
+	swnodes = kzalloc_objs(*swnodes, n_leds);
+	if (!swnodes)
+		return -ENOMEM;
+
+	/*
+	 * Each LED is represented by 3 properties: "gpios",
+	 * "linux,default-trigger", and am empty terminator.
+	 */
+	props = kzalloc_objs(*props, n_leds * 3);
+	if (!props) {
+		err = -ENOMEM;
+		goto err_free_swnodes;
+	}
+
+	gpio_refs = kzalloc_objs(*gpio_refs, n_leds);
+	if (!gpio_refs) {
+		err = -ENOMEM;
+		goto err_free_props;
+	}
+
+	group[0] = &geode_gpio_leds_node;
+	for (i = 0; i < n_leds; i++) {
+		node_name = kasprintf(GFP_KERNEL, "%s:%d", label, i);
+		if (!node_name) {
+			err = -ENOMEM;
+			goto err_free_names;
+		}
+
+		gpio_refs[i] = SOFTWARE_NODE_REFERENCE(&cs5535_gpio_swnode,
+						       leds[i].pin,
+						       GPIO_ACTIVE_LOW);
+		props[i * 3 + 0] =
+			PROPERTY_ENTRY_REF_ARRAY_LEN("gpios", &gpio_refs[i], 1);
+		props[i * 3 + 1] =
+			PROPERTY_ENTRY_STRING("linux,default-trigger",
+					      leds[i].default_on ?
+					      "default-on" : "default-off");
+		/* props[i * 3 + 2] is an empty terminator */
+
+		swnodes[i] = SOFTWARE_NODE(node_name, &props[i * 3],
+					   &geode_gpio_leds_node);
+		group[i + 1] = &swnodes[i];
+	}
+
+	err = software_node_register_node_group(group);
+	if (err) {
+		pr_err("failed to register LED software nodes: %d\n", err);
+		goto err_free_names;
+	}
+
+	led_info.fwnode = software_node_fwnode(&geode_gpio_leds_node);
+
+	led_dev = platform_device_register_full(&led_info);
+	err = PTR_ERR_OR_ZERO(led_dev);
+	if (err) {
+		pr_err("failed to create LED device: %d\n", err);
+		goto err_unregister_group;
+	}
+
+	return 0;
+
+err_unregister_group:
+	software_node_unregister_node_group(group);
+err_free_names:
+	while (--i >= 0)
+		kfree(swnodes[i].name);
+	kfree(gpio_refs);
+err_free_props:
+	kfree(props);
+err_free_swnodes:
+	kfree(swnodes);
+	return err;
+}
+
+MODULE_IMPORT_NS("CS5535");

linux-7.2.3/arch/x86/platform/geode/geode-common.h

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Shared helpers to register GPIO-connected buttons and LEDs
+ * on AMD Geode boards.
+ */
+
+#ifndef __PLATFORM_GEODE_COMMON_H
+#define __PLATFORM_GEODE_COMMON_H
+
+#include <linux/property.h>
+
+struct geode_led {
+	unsigned int pin;
+	bool default_on;
+};
+
+int geode_create_restart_key(unsigned int pin);
+int geode_create_leds(const char *label, const struct geode_led *leds,
+		      unsigned int n_leds);
+
+#endif /* __PLATFORM_GEODE_COMMON_H */

linux-7.2.3/arch/x86/platform/geode/geos.c

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * System Specific setup for Traverse Technologies GEOS.
+ * At the moment this means setup of GPIO control of LEDs.
+ *
+ * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
+ * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
+ *                and Philip Prindeville <philipp@redfish-solutions.com>
+ *
+ * TODO: There are large similarities with leds-net5501.c
+ * by Alessandro Zummo <a.zummo@towertech.it>
+ * In the future leds-net5501.c should be migrated over to platform
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/string.h>
+#include <linux/dmi.h>
+
+#include <asm/geode.h>
+
+#include "geode-common.h"
+
+static const struct geode_led geos_leds[] __initconst = {
+	{ 6, true },
+	{ 25, false },
+	{ 27, false },
+};
+
+static void __init register_geos(void)
+{
+	geode_create_restart_key(3);
+	geode_create_leds("geos", geos_leds, ARRAY_SIZE(geos_leds));
+}
+
+static int __init geos_init(void)
+{
+	const char *vendor, *product;
+
+	if (!is_geode())
+		return 0;
+
+	vendor = dmi_get_system_info(DMI_SYS_VENDOR);
+	if (!vendor || strcmp(vendor, "Traverse Technologies"))
+		return 0;
+
+	product = dmi_get_system_info(DMI_PRODUCT_NAME);
+	if (!product || strcmp(product, "Geos"))
+		return 0;
+
+	printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
+	       KBUILD_MODNAME, vendor, product);
+
+	register_geos();
+
+	return 0;
+}
+device_initcall(geos_init);

linux-7.2.3/arch/x86/platform/geode/net5501.c

@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * System Specific setup for Soekris net5501
+ * At the moment this means setup of GPIO control of LEDs and buttons
+ * on net5501 boards.
+ *
+ * Copyright (C) 2008-2009 Tower Technologies
+ * Written by Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
+ * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
+ *                and Philip Prindeville <philipp@redfish-solutions.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/string.h>
+#include <linux/input.h>
+#include <linux/gpio/machine.h>
+#include <linux/gpio/property.h>
+
+#include <asm/geode.h>
+
+#include "geode-common.h"
+
+#define BIOS_REGION_BASE		0xffff0000
+#define BIOS_REGION_SIZE		0x00010000
+
+static const struct geode_led net5501_leds[] __initconst = {
+	{ 6, true },
+};
+
+static void __init register_net5501(void)
+{
+	geode_create_restart_key(24);
+	geode_create_leds("net5501", net5501_leds, ARRAY_SIZE(net5501_leds));
+}
+
+struct net5501_board {
+	u16	offset;
+	u16	len;
+	char	*sig;
+};
+
+static struct net5501_board __initdata boards[] = {
+	{ 0xb7b, 7, "net5501" },	/* net5501 v1.33/1.33c */
+	{ 0xb1f, 7, "net5501" },	/* net5501 v1.32i */
+};
+
+static bool __init net5501_present(void)
+{
+	int i;
+	unsigned char *rombase, *bios;
+	bool found = false;
+
+	rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
+	if (!rombase) {
+		printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
+		return found;
+	}
+
+	bios = rombase + 0x20;	/* null terminated */
+
+	if (memcmp(bios, "comBIOS", 7))
+		goto unmap;
+
+	for (i = 0; i < ARRAY_SIZE(boards); i++) {
+		unsigned char *model = rombase + boards[i].offset;
+
+		if (!memcmp(model, boards[i].sig, boards[i].len)) {
+			printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
+			       KBUILD_MODNAME, model);
+
+			found = true;
+			break;
+		}
+	}
+
+unmap:
+	iounmap(rombase);
+	return found;
+}
+
+static int __init net5501_init(void)
+{
+	if (!is_geode())
+		return 0;
+
+	if (!net5501_present())
+		return 0;
+
+	register_net5501();
+
+	return 0;
+}
+device_initcall(net5501_init);