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authorEd Wildgoose <git@wildgooses.com>2011-09-20 23:00:12 +0200
committerThomas Gleixner <tglx@linutronix.de>2011-09-21 11:19:42 +0200
commitd4f3e350172a1dc769ed5e7f5bd540feb0c475d8 (patch)
treeddf2c6a7b32b9c91e003f7f60260ddf985e91b16 /arch/x86/platform/geode
parentMerge branch 'irq-fixes-for-linus' of git://tesla.tglx.de/git/linux-2.6-tip (diff)
downloadlinux-d4f3e350172a1dc769ed5e7f5bd540feb0c475d8.tar.xz
linux-d4f3e350172a1dc769ed5e7f5bd540feb0c475d8.zip
x86: geode: New PCEngines Alix system driver
This new driver replaces the old PCEngines Alix 2/3 LED driver with a new driver that controls the LEDs through the leds-gpio driver. The old driver accessed GPIOs directly, which created a conflict and prevented also loading the cs5535-gpio driver to read other GPIOs on the Alix board. With this new driver, we hook into leds-gpio which in turn uses GPIO to control the LEDs and therefore it's possible to control both the LEDs and access onboard GPIOs Driver is moved to platform/geode as requested by Grant and any other geode initialisation modules should move here also This driver is inspired by leds-net5501.c by Alessandro Zummo. Ideally, leds-net5501.c should also be moved to platform/geode. Additionally the driver relies on parts of the patch: 7f131cf3ed ("leds: leds-alix2c - take port address from MSR) by Daniel Mack to perform detection of the Alix board. [akpm@linux-foundation.org: include module.h] Signed-off-by: Ed Wildgoose <kernel@wildgooses.com> Cc: git@wildgooses.com Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Daniel Mack <daniel@caiaq.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Richard Purdie <rpurdie@rpsys.net> Reviewed-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/platform/geode')
-rw-r--r--arch/x86/platform/geode/Makefile1
-rw-r--r--arch/x86/platform/geode/alix.c142
2 files changed, 143 insertions, 0 deletions
diff --git a/arch/x86/platform/geode/Makefile b/arch/x86/platform/geode/Makefile
new file mode 100644
index 000000000000..07c9cd05021a
--- /dev/null
+++ b/arch/x86/platform/geode/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ALIX) += alix.o
diff --git a/arch/x86/platform/geode/alix.c b/arch/x86/platform/geode/alix.c
new file mode 100644
index 000000000000..ca1973699d3d
--- /dev/null
+++ b/arch/x86/platform/geode/alix.c
@@ -0,0 +1,142 @@
+/*
+ * 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>
+ *
+ * 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
+ *
+ * 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 <asm/geode.h>
+
+static int 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 struct gpio_led alix_leds[] = {
+ {
+ .name = "alix:1",
+ .gpio = 6,
+ .default_trigger = "default-on",
+ .active_low = 1,
+ },
+ {
+ .name = "alix:2",
+ .gpio = 25,
+ .default_trigger = "default-off",
+ .active_low = 1,
+ },
+ {
+ .name = "alix:3",
+ .gpio = 27,
+ .default_trigger = "default-off",
+ .active_low = 1,
+ },
+};
+
+static struct gpio_led_platform_data alix_leds_data = {
+ .num_leds = ARRAY_SIZE(alix_leds),
+ .leds = alix_leds,
+};
+
+static struct platform_device alix_leds_dev = {
+ .name = "leds-gpio",
+ .id = -1,
+ .dev.platform_data = &alix_leds_data,
+};
+
+static void __init register_alix(void)
+{
+ /* Setup LED control through leds-gpio driver */
+ platform_device_register(&alix_leds_dev);
+}
+
+static int __init alix_present(unsigned long bios_phys,
+ const char *alix_sig,
+ size_t alix_sig_len)
+{
+ const size_t bios_len = 0x00010000;
+ 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 1;
+ }
+
+ 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')) {
+ printk(KERN_INFO
+ "%s: system is recognized as \"%s\"\n",
+ KBUILD_MODNAME, name);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+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(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
+ alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
+ register_alix();
+
+ return 0;
+}
+
+module_init(alix_init);
+
+MODULE_AUTHOR("Ed Wildgoose <kernel@wildgooses.com>");
+MODULE_DESCRIPTION("PCEngines ALIX System Setup");
+MODULE_LICENSE("GPL");