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>

4 files changed, 158 insertions, 0 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6a47bb22657f..8c4e5bc35e29 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2064,6 +2064,20 @@ config OLPC_XO15_SCI
            - AC adapter status updates
            - Battery status updates
 
+config ALIX
+        bool "PCEngines ALIX System Support (LED setup)"
+        select GPIOLIB
+        ---help---
+          This option enables system support for the PCEngines ALIX.
+          At present this just sets up LEDs for GPIO control on
+          ALIX2/3/6 boards.  However, other system specific setup should
+          get added here.
+
+          Note: You must still enable the drivers for GPIO and LED support
+          (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
+
+          Note: You have to set alix.force=1 for boards with Award BIOS.
+
 endif # X86_32
 
 config AMD_NB
diff --git a/arch/x86/platform/Makefile b/arch/x86/platform/Makefile
index 021eee91c056..8d874396cb29 100644
--- a/arch/x86/platform/Makefile
+++ b/arch/x86/platform/Makefile
@@ -1,6 +1,7 @@
 # Platform specific code goes here
 obj-y   += ce4100/
 obj-y   += efi/
+obj-y   += geode/
 obj-y   += iris/
 obj-y   += mrst/
 obj-y   += olpc/
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");