x86/geode/net5501: Add platform driver for Soekris Engineering net5501

Add platform driver for the Soekris Engineering net5501 single-board
computer.  Probes well-known locations in ROM for BIOS signature
to confirm correct platform.  Registers 1 LED and 1 GPIO-based
button (typically used for soft reset).

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Andres Salomon <dilinger@queued.net>
Cc: Matthew Garrett <mjg@redhat.com>
[ Removed Kconfig and Makefile detritus from drivers/leds/]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-jv5uf34996juqh5syes8mn4h@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 155 insertions, 0 deletions

diff --git a/arch/x86/platform/geode/Makefile b/arch/x86/platform/geode/Makefile
index 07c9cd05021a..246b788847ff 100644
--- a/arch/x86/platform/geode/Makefile
+++ b/arch/x86/platform/geode/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_ALIX)		+= alix.o
+obj-$(CONFIG_NET5501)		+= net5501.o
diff --git a/arch/x86/platform/geode/net5501.c b/arch/x86/platform/geode/net5501.c
new file mode 100644
index 000000000000..66d377e334f7
--- /dev/null
+++ b/arch/x86/platform/geode/net5501.c
@@ -0,0 +1,154 @@
+/*
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/input.h>
+#include <linux/gpio_keys.h>
+
+#include <asm/geode.h>
+
+#define BIOS_REGION_BASE		0xffff0000
+#define BIOS_REGION_SIZE		0x00010000
+
+static struct gpio_keys_button net5501_gpio_buttons[] = {
+	{
+		.code = KEY_RESTART,
+		.gpio = 24,
+		.active_low = 1,
+		.desc = "Reset button",
+		.type = EV_KEY,
+		.wakeup = 0,
+		.debounce_interval = 100,
+		.can_disable = 0,
+	}
+};
+static struct gpio_keys_platform_data net5501_buttons_data = {
+	.buttons = net5501_gpio_buttons,
+	.nbuttons = ARRAY_SIZE(net5501_gpio_buttons),
+	.poll_interval = 20,
+};
+
+static struct platform_device net5501_buttons_dev = {
+	.name = "gpio-keys-polled",
+	.id = 1,
+	.dev = {
+		.platform_data = &net5501_buttons_data,
+	}
+};
+
+static struct gpio_led net5501_leds[] = {
+	{
+		.name = "net5501:1",
+		.gpio = 6,
+		.default_trigger = "default-on",
+		.active_low = 1,
+	},
+};
+
+static struct gpio_led_platform_data net5501_leds_data = {
+	.num_leds = ARRAY_SIZE(net5501_leds),
+	.leds = net5501_leds,
+};
+
+static struct platform_device net5501_leds_dev = {
+	.name = "leds-gpio",
+	.id = -1,
+	.dev.platform_data = &net5501_leds_data,
+};
+
+static struct __initdata platform_device *net5501_devs[] = {
+	&net5501_buttons_dev,
+	&net5501_leds_dev,
+};
+
+static void __init register_net5501(void)
+{
+	/* Setup LED control through leds-gpio driver */
+	platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs));
+}
+
+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;
+}
+
+module_init(net5501_init);
+
+MODULE_AUTHOR("Philip Prindeville <philipp@redfish-solutions.com>");
+MODULE_DESCRIPTION("Soekris net5501 System Setup");
+MODULE_LICENSE("GPL");