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>

3 files changed, 0 insertions, 248 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index b591e726a6fa..8974d274334f 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -113,14 +113,6 @@ config LEDS_WRAP
         help
           This option enables support for the PCEngines WRAP programmable LEDs.
 
-config LEDS_ALIX2
-        tristate "LED Support for ALIX.2 and ALIX.3 series"
-        depends on LEDS_CLASS
-        depends on X86 && !GPIO_CS5535 && !CS5535_GPIO
-        help
-          This option enables support for the PCEngines ALIX.2 and ALIX.3 LEDs.
-          You have to set leds-alix2.force=1 for boards with Award BIOS.
-
 config LEDS_COBALT_QUBE
         tristate "LED Support for the Cobalt Qube series front LED"
         depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index bbfd2e367dc0..a0a1b89d78a8 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -16,7 +16,6 @@ obj-$(CONFIG_LEDS_AMS_DELTA)		+= leds-ams-delta.o
 obj-$(CONFIG_LEDS_NET48XX)              += leds-net48xx.o
 obj-$(CONFIG_LEDS_NET5501)              += leds-net5501.o
 obj-$(CONFIG_LEDS_WRAP)                 += leds-wrap.o
-obj-$(CONFIG_LEDS_ALIX2)                += leds-alix2.o
 obj-$(CONFIG_LEDS_COBALT_QUBE)          += leds-cobalt-qube.o
 obj-$(CONFIG_LEDS_COBALT_RAQ)           += leds-cobalt-raq.o
 obj-$(CONFIG_LEDS_SUNFIRE)              += leds-sunfire.o
diff --git a/drivers/leds/leds-alix2.c b/drivers/leds/leds-alix2.c
deleted file mode 100644
index f59ffadf5125..000000000000
--- a/drivers/leds/leds-alix2.c
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
- * LEDs driver for PCEngines ALIX.2 and ALIX.3
- *
- * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
- */
-
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/leds.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/string.h>
-#include <linux/pci.h>
-
-static int force = 0;
-module_param(force, bool, 0444);
-MODULE_PARM_DESC(force, "Assume system has ALIX.2/ALIX.3 style LEDs");
-
-#define MSR_LBAR_GPIO           0x5140000C
-#define CS5535_GPIO_SIZE        256
-
-static u32 gpio_base;
-
-static struct pci_device_id divil_pci[] = {
-        { PCI_DEVICE(PCI_VENDOR_ID_NS,  PCI_DEVICE_ID_NS_CS5535_ISA) },
-        { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
-        { } /* NULL entry */
-};
-MODULE_DEVICE_TABLE(pci, divil_pci);
-
-struct alix_led {
-        struct led_classdev cdev;
-        unsigned short port;
-        unsigned int on_value;
-        unsigned int off_value;
-};
-
-static void alix_led_set(struct led_classdev *led_cdev,
-                         enum led_brightness brightness)
-{
-        struct alix_led *led_dev =
-                container_of(led_cdev, struct alix_led, cdev);
-
-        if (brightness)
-                outl(led_dev->on_value, gpio_base + led_dev->port);
-        else
-                outl(led_dev->off_value, gpio_base + led_dev->port);
-}
-
-static struct alix_led alix_leds[] = {
-        {
-                .cdev = {
-                        .name = "alix:1",
-                        .brightness_set = alix_led_set,
-                },
-                .port = 0x00,
-                .on_value = 1 << 22,
-                .off_value = 1 << 6,
-        },
-        {
-                .cdev = {
-                        .name = "alix:2",
-                        .brightness_set = alix_led_set,
-                },
-                .port = 0x80,
-                .on_value = 1 << 25,
-                .off_value = 1 << 9,
-        },
-        {
-                .cdev = {
-                        .name = "alix:3",
-                        .brightness_set = alix_led_set,
-                },
-                .port = 0x80,
-                .on_value = 1 << 27,
-                .off_value = 1 << 11,
-        },
-};
-
-static int __init alix_led_probe(struct platform_device *pdev)
-{
-        int i;
-        int ret;
-
-        for (i = 0; i < ARRAY_SIZE(alix_leds); i++) {
-                alix_leds[i].cdev.flags |= LED_CORE_SUSPENDRESUME;
-                ret = led_classdev_register(&pdev->dev, &alix_leds[i].cdev);
-                if (ret < 0)
-                        goto fail;
-        }
-        return 0;
-
-fail:
-        while (--i >= 0)
-                led_classdev_unregister(&alix_leds[i].cdev);
-        return ret;
-}
-
-static int alix_led_remove(struct platform_device *pdev)
-{
-        int i;
-
-        for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
-                led_classdev_unregister(&alix_leds[i].cdev);
-        return 0;
-}
-
-static struct platform_driver alix_led_driver = {
-        .remove = alix_led_remove,
-        .driver = {
-                .name = KBUILD_MODNAME,
-                .owner = THIS_MODULE,
-        },
-};
-
-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 has ALIX.2 style LEDs\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 struct platform_device *pdev;
-
-static int __init alix_pci_led_init(void)
-{
-        u32 low, hi;
-
-        if (pci_dev_present(divil_pci) == 0) {
-                printk(KERN_WARNING KBUILD_MODNAME": DIVIL not found\n");
-                return -ENODEV;
-        }
-
-        /* Grab the GPIO I/O range */
-        rdmsr(MSR_LBAR_GPIO, low, hi);
-
-        /* Check the mask and whether GPIO is enabled (sanity check) */
-        if (hi != 0x0000f001) {
-                printk(KERN_WARNING KBUILD_MODNAME": GPIO not enabled\n");
-                return -ENODEV;
-        }
-
-        /* Mask off the IO base address */
-        gpio_base = low & 0x0000ff00;
-
-        if (!request_region(gpio_base, CS5535_GPIO_SIZE, KBUILD_MODNAME)) {
-                printk(KERN_ERR KBUILD_MODNAME": can't allocate I/O for GPIO\n");
-                return -ENODEV;
-        }
-
-        /* Set GPIO function to output */
-        outl(1 << 6, gpio_base + 0x04);
-        outl(1 << 9, gpio_base + 0x84);
-        outl(1 << 11, gpio_base + 0x84);
-
-        return 0;
-}
-
-static int __init alix_led_init(void)
-{
-        int ret = -ENODEV;
-        const char tinybios_sig[] = "PC Engines ALIX.";
-        const char coreboot_sig[] = "PC Engines\0ALIX.";
-
-        if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
-            alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
-                ret = alix_pci_led_init();
-
-        if (ret < 0)
-                return ret;
-
-        pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
-        if (!IS_ERR(pdev)) {
-                ret = platform_driver_probe(&alix_led_driver, alix_led_probe);
-                if (ret)
-                        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");