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486 lines
12 KiB
Diff
486 lines
12 KiB
Diff
From: Ed Wildgoose <git@wildgooses.com>
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Date: Wed, 3 Aug 2011 00:52:36 +0000 (+1000)
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Subject: This new driver replaces the old PCEngines Alix 2/3 LED driver with a new
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X-Git-Tag: next-20110812~1^2~75
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Fnext%2Flinux-next.git;a=commitdiff_plain;h=2cd7b3e8f8078c214c93a2c60cb845500c92df4a;hp=dc849eae35bbf651ab3ee459f5683e1ff780413d
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This new driver replaces the old PCEngines Alix 2/3 LED driver with a new
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driver that controls the LEDs through the leds-gpio driver. The old
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driver accessed GPIOs directly, which created a conflict and prevented
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also loading the cs5535-gpio driver to read other GPIOs on the Alix board.
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With this new driver, we hook into leds-gpio which in turn uses GPIO to
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control the LEDs and therefore it's possible to control both the LEDs and
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access onboard GPIOs
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Driver is moved to platform/geode and any other geode initialisation
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modules should move here also.
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This driver is inspired by leds-net5501.c by Alessandro Zummo.
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Ideally, leds-net5501.c should also be moved to platform/geode.
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Additionally the driver relies on parts of the patch: 7f131cf3ed ("leds:
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leds-alix2c - take port address from MSR) by Daniel Mack to perform
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detection of the Alix board.
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Signed-off-by: Ed Wildgoose <kernel@wildgooses.com>
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Cc: Alessandro Zummo <a.zummo@towertech.it>
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Cc: Daniel Mack <daniel@caiaq.de>
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Reviewed-by: Grant Likely <grant.likely@secretlab.ca>
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Cc: Ingo Molnar <mingo@elte.hu>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Cc: "H. Peter Anvin" <hpa@zytor.com>
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Cc: Richard Purdie <rpurdie@rpsys.net>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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---
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--- a/arch/x86/Kconfig
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+++ b/arch/x86/Kconfig
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@@ -2087,6 +2087,20 @@ config OLPC_XO1
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---help---
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Add support for non-essential features of the OLPC XO-1 laptop.
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+config ALIX
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+ bool "PCEngines ALIX System Support (LED setup)"
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+ select GPIOLIB
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+ ---help---
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+ This option enables system support for the PCEngines ALIX.
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+ At present this just sets up LEDs for GPIO control on
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+ ALIX2/3/6 boards. However, other system specific setup should
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+ get added here.
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+
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+ Note: You must still enable the drivers for GPIO and LED support
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+ (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
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+
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+ Note: You have to set alix.force=1 for boards with Award BIOS.
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+
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endif # X86_32
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config AMD_NB
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--- a/arch/x86/platform/Makefile
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+++ b/arch/x86/platform/Makefile
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@@ -1,6 +1,7 @@
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# Platform specific code goes here
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obj-y += ce4100/
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obj-y += efi/
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+obj-y += geode/
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obj-y += iris/
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obj-y += mrst/
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obj-y += olpc/
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--- /dev/null
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+++ b/arch/x86/platform/geode/Makefile
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@@ -0,0 +1 @@
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+obj-$(CONFIG_ALIX) += alix.o
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--- /dev/null
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+++ b/arch/x86/platform/geode/alix.c
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@@ -0,0 +1,141 @@
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+/*
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+ * System Specific setup for PCEngines ALIX.
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+ * At the moment this means setup of GPIO control of LEDs
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+ * on Alix.2/3/6 boards.
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+ *
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+ *
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+ * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
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+ * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
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+ *
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+ * TODO: There are large similarities with leds-net5501.c
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+ * by Alessandro Zummo <a.zummo@towertech.it>
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+ * In the future leds-net5501.c should be migrated over to platform
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2
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+ * as published by the Free Software Foundation.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/io.h>
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+#include <linux/string.h>
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+#include <linux/leds.h>
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+#include <linux/platform_device.h>
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+#include <linux/gpio.h>
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+
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+#include <asm/geode.h>
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+
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+static int force = 0;
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+module_param(force, bool, 0444);
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+/* FIXME: Award bios is not automatically detected as Alix platform */
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+MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform");
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+
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+static struct gpio_led alix_leds[] = {
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+ {
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+ .name = "alix:1",
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+ .gpio = 6,
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+ .default_trigger = "default-on",
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+ .active_low = 1,
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+ },
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+ {
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+ .name = "alix:2",
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+ .gpio = 25,
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+ .default_trigger = "default-off",
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+ .active_low = 1,
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+ },
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+ {
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+ .name = "alix:3",
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+ .gpio = 27,
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+ .default_trigger = "default-off",
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+ .active_low = 1,
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+ },
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+};
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+
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+static struct gpio_led_platform_data alix_leds_data = {
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+ .num_leds = ARRAY_SIZE(alix_leds),
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+ .leds = alix_leds,
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+};
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+
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+static struct platform_device alix_leds_dev = {
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+ .name = "leds-gpio",
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+ .id = -1,
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+ .dev.platform_data = &alix_leds_data,
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+};
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+
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+static void __init register_alix(void)
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+{
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+ /* Setup LED control through leds-gpio driver */
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+ platform_device_register(&alix_leds_dev);
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+}
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+
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+static int __init alix_present(unsigned long bios_phys,
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+ const char *alix_sig,
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+ size_t alix_sig_len)
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+{
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+ const size_t bios_len = 0x00010000;
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+ const char *bios_virt;
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+ const char *scan_end;
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+ const char *p;
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+ char name[64];
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+
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+ if (force) {
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+ printk(KERN_NOTICE "%s: forced to skip BIOS test, "
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+ "assume system is ALIX.2/ALIX.3\n",
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+ KBUILD_MODNAME);
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+ return 1;
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+ }
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+
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+ bios_virt = phys_to_virt(bios_phys);
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+ scan_end = bios_virt + bios_len - (alix_sig_len + 2);
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+ for (p = bios_virt; p < scan_end; p++) {
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+ const char *tail;
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+ char *a;
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+
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+ if (memcmp(p, alix_sig, alix_sig_len) != 0)
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+ continue;
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+
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+ memcpy(name, p, sizeof(name));
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+
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+ /* remove the first \0 character from string */
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+ a = strchr(name, '\0');
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+ if (a)
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+ *a = ' ';
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+
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+ /* cut the string at a newline */
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+ a = strchr(name, '\r');
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+ if (a)
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+ *a = '\0';
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+
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+ tail = p + alix_sig_len;
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+ if ((tail[0] == '2' || tail[0] == '3')) {
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+ printk(KERN_INFO
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+ "%s: system is recognized as \"%s\"\n",
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+ KBUILD_MODNAME, name);
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+ return 1;
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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+static int __init alix_init(void)
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+{
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+ const char tinybios_sig[] = "PC Engines ALIX.";
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+ const char coreboot_sig[] = "PC Engines\0ALIX.";
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+
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+ if (!is_geode())
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+ return 0;
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+
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+ if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
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+ alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
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+ register_alix();
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+
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+ return 0;
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+}
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+
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+module_init(alix_init);
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+
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+MODULE_AUTHOR("Ed Wildgoose <kernel@wildgooses.com>");
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+MODULE_DESCRIPTION("PCEngines ALIX System Setup");
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+MODULE_LICENSE("GPL");
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--- a/drivers/leds/Kconfig
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+++ b/drivers/leds/Kconfig
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@@ -107,14 +107,6 @@ config LEDS_WRAP
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help
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This option enables support for the PCEngines WRAP programmable LEDs.
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-config LEDS_ALIX2
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- tristate "LED Support for ALIX.2 and ALIX.3 series"
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- depends on LEDS_CLASS
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- depends on X86 && !GPIO_CS5535 && !CS5535_GPIO
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- help
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- This option enables support for the PCEngines ALIX.2 and ALIX.3 LEDs.
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- You have to set leds-alix2.force=1 for boards with Award BIOS.
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-
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config LEDS_H1940
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tristate "LED Support for iPAQ H1940 device"
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depends on LEDS_CLASS
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--- a/drivers/leds/Makefile
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+++ b/drivers/leds/Makefile
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@@ -16,7 +16,6 @@ obj-$(CONFIG_LEDS_AMS_DELTA) += leds-am
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obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
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obj-$(CONFIG_LEDS_NET5501) += leds-net5501.o
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obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o
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-obj-$(CONFIG_LEDS_ALIX2) += leds-alix2.o
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obj-$(CONFIG_LEDS_H1940) += leds-h1940.o
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obj-$(CONFIG_LEDS_COBALT_QUBE) += leds-cobalt-qube.o
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obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-cobalt-raq.o
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--- a/drivers/leds/leds-alix2.c
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+++ /dev/null
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@@ -1,239 +0,0 @@
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-/*
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- * LEDs driver for PCEngines ALIX.2 and ALIX.3
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- *
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- * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
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- */
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-
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-#include <linux/err.h>
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-#include <linux/io.h>
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-#include <linux/kernel.h>
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-#include <linux/leds.h>
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-#include <linux/module.h>
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-#include <linux/platform_device.h>
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-#include <linux/string.h>
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-#include <linux/pci.h>
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-
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-static int force = 0;
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-module_param(force, bool, 0444);
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-MODULE_PARM_DESC(force, "Assume system has ALIX.2/ALIX.3 style LEDs");
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-
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-#define MSR_LBAR_GPIO 0x5140000C
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-#define CS5535_GPIO_SIZE 256
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-
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-static u32 gpio_base;
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-
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-static struct pci_device_id divil_pci[] = {
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- { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
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- { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
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- { } /* NULL entry */
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-};
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-MODULE_DEVICE_TABLE(pci, divil_pci);
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-
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-struct alix_led {
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- struct led_classdev cdev;
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- unsigned short port;
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- unsigned int on_value;
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- unsigned int off_value;
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-};
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-
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-static void alix_led_set(struct led_classdev *led_cdev,
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- enum led_brightness brightness)
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-{
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- struct alix_led *led_dev =
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- container_of(led_cdev, struct alix_led, cdev);
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-
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- if (brightness)
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- outl(led_dev->on_value, gpio_base + led_dev->port);
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- else
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- outl(led_dev->off_value, gpio_base + led_dev->port);
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-}
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-
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-static struct alix_led alix_leds[] = {
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- {
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- .cdev = {
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- .name = "alix:1",
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- .brightness_set = alix_led_set,
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- },
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- .port = 0x00,
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- .on_value = 1 << 22,
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- .off_value = 1 << 6,
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- },
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- {
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- .cdev = {
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- .name = "alix:2",
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- .brightness_set = alix_led_set,
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- },
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- .port = 0x80,
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- .on_value = 1 << 25,
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- .off_value = 1 << 9,
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- },
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- {
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- .cdev = {
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- .name = "alix:3",
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- .brightness_set = alix_led_set,
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- },
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- .port = 0x80,
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- .on_value = 1 << 27,
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- .off_value = 1 << 11,
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- },
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-};
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-
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-static int __init alix_led_probe(struct platform_device *pdev)
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-{
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- int i;
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- int ret;
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-
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- for (i = 0; i < ARRAY_SIZE(alix_leds); i++) {
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- alix_leds[i].cdev.flags |= LED_CORE_SUSPENDRESUME;
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- ret = led_classdev_register(&pdev->dev, &alix_leds[i].cdev);
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- if (ret < 0)
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- goto fail;
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- }
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- return 0;
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-
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-fail:
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- while (--i >= 0)
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- led_classdev_unregister(&alix_leds[i].cdev);
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- return ret;
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-}
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-
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-static int alix_led_remove(struct platform_device *pdev)
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-{
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- int i;
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-
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- for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
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- led_classdev_unregister(&alix_leds[i].cdev);
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- return 0;
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-}
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-
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-static struct platform_driver alix_led_driver = {
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- .remove = alix_led_remove,
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- .driver = {
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- .name = KBUILD_MODNAME,
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- .owner = THIS_MODULE,
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- },
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-};
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-
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-static int __init alix_present(unsigned long bios_phys,
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- const char *alix_sig,
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- size_t alix_sig_len)
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-{
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- const size_t bios_len = 0x00010000;
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- const char *bios_virt;
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- const char *scan_end;
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- const char *p;
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- char name[64];
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-
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- if (force) {
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- printk(KERN_NOTICE "%s: forced to skip BIOS test, "
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- "assume system has ALIX.2 style LEDs\n",
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- KBUILD_MODNAME);
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- return 1;
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- }
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-
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- bios_virt = phys_to_virt(bios_phys);
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- scan_end = bios_virt + bios_len - (alix_sig_len + 2);
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- for (p = bios_virt; p < scan_end; p++) {
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- const char *tail;
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- char *a;
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-
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- if (memcmp(p, alix_sig, alix_sig_len) != 0)
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- continue;
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-
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- memcpy(name, p, sizeof(name));
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-
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- /* remove the first \0 character from string */
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- a = strchr(name, '\0');
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- if (a)
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- *a = ' ';
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-
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- /* cut the string at a newline */
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- a = strchr(name, '\r');
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- if (a)
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- *a = '\0';
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-
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- tail = p + alix_sig_len;
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- if ((tail[0] == '2' || tail[0] == '3')) {
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- printk(KERN_INFO
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- "%s: system is recognized as \"%s\"\n",
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- KBUILD_MODNAME, name);
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- return 1;
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- }
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- }
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-
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- return 0;
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-}
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-
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-static struct platform_device *pdev;
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-
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-static int __init alix_pci_led_init(void)
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-{
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- u32 low, hi;
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-
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- if (pci_dev_present(divil_pci) == 0) {
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- printk(KERN_WARNING KBUILD_MODNAME": DIVIL not found\n");
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- return -ENODEV;
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- }
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-
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- /* Grab the GPIO I/O range */
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- rdmsr(MSR_LBAR_GPIO, low, hi);
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-
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- /* Check the mask and whether GPIO is enabled (sanity check) */
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- if (hi != 0x0000f001) {
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- printk(KERN_WARNING KBUILD_MODNAME": GPIO not enabled\n");
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- return -ENODEV;
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- }
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-
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- /* Mask off the IO base address */
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- gpio_base = low & 0x0000ff00;
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-
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- if (!request_region(gpio_base, CS5535_GPIO_SIZE, KBUILD_MODNAME)) {
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- printk(KERN_ERR KBUILD_MODNAME": can't allocate I/O for GPIO\n");
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- return -ENODEV;
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- }
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-
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- /* Set GPIO function to output */
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- outl(1 << 6, gpio_base + 0x04);
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- outl(1 << 9, gpio_base + 0x84);
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- outl(1 << 11, gpio_base + 0x84);
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-
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- return 0;
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-}
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-
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-static int __init alix_led_init(void)
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-{
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- int ret = -ENODEV;
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- const char tinybios_sig[] = "PC Engines ALIX.";
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- const char coreboot_sig[] = "PC Engines\0ALIX.";
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-
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- if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
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- alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
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- ret = alix_pci_led_init();
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-
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- if (ret < 0)
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- return ret;
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-
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- pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
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- if (!IS_ERR(pdev)) {
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- ret = platform_driver_probe(&alix_led_driver, alix_led_probe);
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- if (ret)
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- platform_device_unregister(pdev);
|
|
- } else
|
|
- ret = PTR_ERR(pdev);
|
|
-
|
|
- return ret;
|
|
-}
|
|
-
|
|
-static void __exit alix_led_exit(void)
|
|
-{
|
|
- platform_device_unregister(pdev);
|
|
- platform_driver_unregister(&alix_led_driver);
|
|
- release_region(gpio_base, CS5535_GPIO_SIZE);
|
|
-}
|
|
-
|
|
-module_init(alix_led_init);
|
|
-module_exit(alix_led_exit);
|
|
-
|
|
-MODULE_AUTHOR("Constantin Baranov <const@mimas.ru>");
|
|
-MODULE_DESCRIPTION("PCEngines ALIX.2 and ALIX.3 LED driver");
|
|
-MODULE_LICENSE("GPL");
|