mirror of https://gitee.com/openkylin/linux.git
557 lines
14 KiB
C
557 lines
14 KiB
C
/*
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* SS4200-E Hardware API
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* Copyright (c) 2009, Intel Corporation.
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* Copyright IBM Corporation, 2009
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Author: Dave Hansen <dave@sr71.net>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/dmi.h>
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#include <linux/init.h>
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#include <linux/ioport.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/pci.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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MODULE_AUTHOR("Rodney Girod <rgirod@confocus.com>, Dave Hansen <dave@sr71.net>");
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MODULE_DESCRIPTION("Intel NAS/Home Server ICH7 GPIO Driver");
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MODULE_LICENSE("GPL");
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/*
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* ICH7 LPC/GPIO PCI Config register offsets
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*/
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#define PMBASE 0x040
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#define GPIO_BASE 0x048
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#define GPIO_CTRL 0x04c
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#define GPIO_EN 0x010
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/*
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* The ICH7 GPIO register block is 64 bytes in size.
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*/
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#define ICH7_GPIO_SIZE 64
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/*
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* Define register offsets within the ICH7 register block.
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*/
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#define GPIO_USE_SEL 0x000
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#define GP_IO_SEL 0x004
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#define GP_LVL 0x00c
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#define GPO_BLINK 0x018
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#define GPI_INV 0x030
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#define GPIO_USE_SEL2 0x034
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#define GP_IO_SEL2 0x038
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#define GP_LVL2 0x03c
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/*
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* PCI ID of the Intel ICH7 LPC Device within which the GPIO block lives.
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*/
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static const struct pci_device_id ich7_lpc_pci_id[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_30) },
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{ } /* NULL entry */
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};
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MODULE_DEVICE_TABLE(pci, ich7_lpc_pci_id);
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static int __init ss4200_led_dmi_callback(const struct dmi_system_id *id)
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{
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pr_info("detected '%s'\n", id->ident);
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return 1;
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}
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static bool nodetect;
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module_param_named(nodetect, nodetect, bool, 0);
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MODULE_PARM_DESC(nodetect, "Skip DMI-based hardware detection");
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/*
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* struct nas_led_whitelist - List of known good models
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*
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* Contains the known good models this driver is compatible with.
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* When adding a new model try to be as strict as possible. This
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* makes it possible to keep the false positives (the model is
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* detected as working, but in reality it is not) as low as
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* possible.
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*/
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static struct dmi_system_id nas_led_whitelist[] __initdata = {
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{
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.callback = ss4200_led_dmi_callback,
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.ident = "Intel SS4200-E",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
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DMI_MATCH(DMI_PRODUCT_NAME, "SS4200-E"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "1.00.00")
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}
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},
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{}
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};
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/*
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* Base I/O address assigned to the Power Management register block
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*/
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static u32 g_pm_io_base;
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/*
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* Base I/O address assigned to the ICH7 GPIO register block
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*/
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static u32 nas_gpio_io_base;
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/*
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* When we successfully register a region, we are returned a resource.
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* We use these to identify which regions we need to release on our way
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* back out.
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*/
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static struct resource *gp_gpio_resource;
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struct nasgpio_led {
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char *name;
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u32 gpio_bit;
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struct led_classdev led_cdev;
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};
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/*
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* gpio_bit(s) are the ICH7 GPIO bit assignments
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*/
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static struct nasgpio_led nasgpio_leds[] = {
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{ .name = "hdd1:blue:sata", .gpio_bit = 0 },
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{ .name = "hdd1:amber:sata", .gpio_bit = 1 },
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{ .name = "hdd2:blue:sata", .gpio_bit = 2 },
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{ .name = "hdd2:amber:sata", .gpio_bit = 3 },
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{ .name = "hdd3:blue:sata", .gpio_bit = 4 },
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{ .name = "hdd3:amber:sata", .gpio_bit = 5 },
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{ .name = "hdd4:blue:sata", .gpio_bit = 6 },
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{ .name = "hdd4:amber:sata", .gpio_bit = 7 },
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{ .name = "power:blue:power", .gpio_bit = 27},
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{ .name = "power:amber:power", .gpio_bit = 28},
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};
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#define NAS_RECOVERY 0x00000400 /* GPIO10 */
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static struct nasgpio_led *
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led_classdev_to_nasgpio_led(struct led_classdev *led_cdev)
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{
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return container_of(led_cdev, struct nasgpio_led, led_cdev);
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}
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static struct nasgpio_led *get_led_named(char *name)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++) {
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if (strcmp(nasgpio_leds[i].name, name))
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continue;
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return &nasgpio_leds[i];
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}
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return NULL;
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}
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/*
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* This protects access to the gpio ports.
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*/
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static DEFINE_SPINLOCK(nasgpio_gpio_lock);
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/*
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* There are two gpio ports, one for blinking and the other
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* for power. @port tells us if we're doing blinking or
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* power control.
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*
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* Caller must hold nasgpio_gpio_lock
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*/
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static void __nasgpio_led_set_attr(struct led_classdev *led_cdev,
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u32 port, u32 value)
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{
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struct nasgpio_led *led = led_classdev_to_nasgpio_led(led_cdev);
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u32 gpio_out;
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gpio_out = inl(nas_gpio_io_base + port);
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if (value)
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gpio_out |= (1<<led->gpio_bit);
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else
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gpio_out &= ~(1<<led->gpio_bit);
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outl(gpio_out, nas_gpio_io_base + port);
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}
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static void nasgpio_led_set_attr(struct led_classdev *led_cdev,
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u32 port, u32 value)
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{
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spin_lock(&nasgpio_gpio_lock);
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__nasgpio_led_set_attr(led_cdev, port, value);
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spin_unlock(&nasgpio_gpio_lock);
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}
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static u32 nasgpio_led_get_attr(struct led_classdev *led_cdev, u32 port)
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{
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struct nasgpio_led *led = led_classdev_to_nasgpio_led(led_cdev);
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u32 gpio_in;
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spin_lock(&nasgpio_gpio_lock);
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gpio_in = inl(nas_gpio_io_base + port);
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spin_unlock(&nasgpio_gpio_lock);
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if (gpio_in & (1<<led->gpio_bit))
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return 1;
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return 0;
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}
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/*
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* There is actual brightness control in the hardware,
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* but it is via smbus commands and not implemented
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* in this driver.
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*/
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static void nasgpio_led_set_brightness(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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u32 setting = 0;
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if (brightness >= LED_HALF)
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setting = 1;
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/*
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* Hold the lock across both operations. This ensures
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* consistency so that both the "turn off blinking"
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* and "turn light off" operations complete as a set.
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*/
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spin_lock(&nasgpio_gpio_lock);
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/*
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* LED class documentation asks that past blink state
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* be disabled when brightness is turned to zero.
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*/
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if (brightness == 0)
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__nasgpio_led_set_attr(led_cdev, GPO_BLINK, 0);
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__nasgpio_led_set_attr(led_cdev, GP_LVL, setting);
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spin_unlock(&nasgpio_gpio_lock);
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}
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static int nasgpio_led_set_blink(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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u32 setting = 1;
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if (!(*delay_on == 0 && *delay_off == 0) &&
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!(*delay_on == 500 && *delay_off == 500))
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return -EINVAL;
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/*
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* These are very approximate.
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*/
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*delay_on = 500;
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*delay_off = 500;
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nasgpio_led_set_attr(led_cdev, GPO_BLINK, setting);
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return 0;
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}
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/*
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* Initialize the ICH7 GPIO registers for NAS usage. The BIOS should have
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* already taken care of this, but we will do so in a non destructive manner
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* so that we have what we need whether the BIOS did it or not.
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*/
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static int ich7_gpio_init(struct device *dev)
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{
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int i;
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u32 config_data = 0;
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u32 all_nas_led = 0;
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for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++)
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all_nas_led |= (1<<nasgpio_leds[i].gpio_bit);
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spin_lock(&nasgpio_gpio_lock);
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/*
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* We need to enable all of the GPIO lines used by the NAS box,
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* so we will read the current Use Selection and add our usage
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* to it. This should be benign with regard to the original
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* BIOS configuration.
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*/
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config_data = inl(nas_gpio_io_base + GPIO_USE_SEL);
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dev_dbg(dev, ": Data read from GPIO_USE_SEL = 0x%08x\n", config_data);
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config_data |= all_nas_led + NAS_RECOVERY;
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outl(config_data, nas_gpio_io_base + GPIO_USE_SEL);
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config_data = inl(nas_gpio_io_base + GPIO_USE_SEL);
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dev_dbg(dev, ": GPIO_USE_SEL = 0x%08x\n\n", config_data);
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/*
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* The LED GPIO outputs need to be configured for output, so we
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* will ensure that all LED lines are cleared for output and the
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* RECOVERY line ready for input. This too should be benign with
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* regard to BIOS configuration.
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*/
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config_data = inl(nas_gpio_io_base + GP_IO_SEL);
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dev_dbg(dev, ": Data read from GP_IO_SEL = 0x%08x\n",
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config_data);
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config_data &= ~all_nas_led;
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config_data |= NAS_RECOVERY;
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outl(config_data, nas_gpio_io_base + GP_IO_SEL);
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config_data = inl(nas_gpio_io_base + GP_IO_SEL);
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dev_dbg(dev, ": GP_IO_SEL = 0x%08x\n", config_data);
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/*
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* In our final system, the BIOS will initialize the state of all
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* of the LEDs. For now, we turn them all off (or Low).
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*/
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config_data = inl(nas_gpio_io_base + GP_LVL);
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dev_dbg(dev, ": Data read from GP_LVL = 0x%08x\n", config_data);
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/*
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* In our final system, the BIOS will initialize the blink state of all
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* of the LEDs. For now, we turn blink off for all of them.
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*/
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config_data = inl(nas_gpio_io_base + GPO_BLINK);
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dev_dbg(dev, ": Data read from GPO_BLINK = 0x%08x\n", config_data);
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/*
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* At this moment, I am unsure if anything needs to happen with GPI_INV
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*/
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config_data = inl(nas_gpio_io_base + GPI_INV);
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dev_dbg(dev, ": Data read from GPI_INV = 0x%08x\n", config_data);
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spin_unlock(&nasgpio_gpio_lock);
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return 0;
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}
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static void ich7_lpc_cleanup(struct device *dev)
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{
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/*
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* If we were given exclusive use of the GPIO
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* I/O Address range, we must return it.
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*/
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if (gp_gpio_resource) {
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dev_dbg(dev, ": Releasing GPIO I/O addresses\n");
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release_region(nas_gpio_io_base, ICH7_GPIO_SIZE);
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gp_gpio_resource = NULL;
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}
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}
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/*
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* The OS has determined that the LPC of the Intel ICH7 Southbridge is present
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* so we can retrive the required operational information and prepare the GPIO.
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*/
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static struct pci_dev *nas_gpio_pci_dev;
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static int ich7_lpc_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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int status;
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u32 gc = 0;
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status = pci_enable_device(dev);
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if (status) {
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dev_err(&dev->dev, "pci_enable_device failed\n");
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return -EIO;
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}
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nas_gpio_pci_dev = dev;
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status = pci_read_config_dword(dev, PMBASE, &g_pm_io_base);
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if (status)
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goto out;
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g_pm_io_base &= 0x00000ff80;
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status = pci_read_config_dword(dev, GPIO_CTRL, &gc);
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if (!(GPIO_EN & gc)) {
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status = -EEXIST;
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dev_info(&dev->dev,
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"ERROR: The LPC GPIO Block has not been enabled.\n");
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goto out;
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}
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status = pci_read_config_dword(dev, GPIO_BASE, &nas_gpio_io_base);
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if (0 > status) {
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dev_info(&dev->dev, "Unable to read GPIOBASE.\n");
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goto out;
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}
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dev_dbg(&dev->dev, ": GPIOBASE = 0x%08x\n", nas_gpio_io_base);
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nas_gpio_io_base &= 0x00000ffc0;
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/*
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* Insure that we have exclusive access to the GPIO I/O address range.
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*/
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gp_gpio_resource = request_region(nas_gpio_io_base, ICH7_GPIO_SIZE,
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KBUILD_MODNAME);
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if (NULL == gp_gpio_resource) {
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dev_info(&dev->dev,
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"ERROR Unable to register GPIO I/O addresses.\n");
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status = -1;
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goto out;
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}
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/*
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* Initialize the GPIO for NAS/Home Server Use
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*/
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ich7_gpio_init(&dev->dev);
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out:
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if (status) {
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ich7_lpc_cleanup(&dev->dev);
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pci_disable_device(dev);
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}
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return status;
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}
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static void ich7_lpc_remove(struct pci_dev *dev)
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{
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ich7_lpc_cleanup(&dev->dev);
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pci_disable_device(dev);
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}
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/*
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* pci_driver structure passed to the PCI modules
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*/
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static struct pci_driver nas_gpio_pci_driver = {
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.name = KBUILD_MODNAME,
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.id_table = ich7_lpc_pci_id,
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.probe = ich7_lpc_probe,
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.remove = ich7_lpc_remove,
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};
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static struct led_classdev *get_classdev_for_led_nr(int nr)
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{
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struct nasgpio_led *nas_led = &nasgpio_leds[nr];
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struct led_classdev *led = &nas_led->led_cdev;
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return led;
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}
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static void set_power_light_amber_noblink(void)
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{
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struct nasgpio_led *amber = get_led_named("power:amber:power");
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struct nasgpio_led *blue = get_led_named("power:blue:power");
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if (!amber || !blue)
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return;
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/*
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* LED_OFF implies disabling future blinking
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*/
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pr_debug("setting blue off and amber on\n");
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nasgpio_led_set_brightness(&blue->led_cdev, LED_OFF);
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nasgpio_led_set_brightness(&amber->led_cdev, LED_FULL);
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}
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static ssize_t nas_led_blink_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led = dev_get_drvdata(dev);
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int blinking = 0;
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if (nasgpio_led_get_attr(led, GPO_BLINK))
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blinking = 1;
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return sprintf(buf, "%u\n", blinking);
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}
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static ssize_t nas_led_blink_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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int ret;
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struct led_classdev *led = dev_get_drvdata(dev);
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unsigned long blink_state;
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ret = kstrtoul(buf, 10, &blink_state);
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if (ret)
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return ret;
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nasgpio_led_set_attr(led, GPO_BLINK, blink_state);
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return size;
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}
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static DEVICE_ATTR(blink, 0644, nas_led_blink_show, nas_led_blink_store);
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static int register_nasgpio_led(int led_nr)
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{
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int ret;
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struct nasgpio_led *nas_led = &nasgpio_leds[led_nr];
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struct led_classdev *led = get_classdev_for_led_nr(led_nr);
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led->name = nas_led->name;
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led->brightness = LED_OFF;
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if (nasgpio_led_get_attr(led, GP_LVL))
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led->brightness = LED_FULL;
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led->brightness_set = nasgpio_led_set_brightness;
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led->blink_set = nasgpio_led_set_blink;
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ret = led_classdev_register(&nas_gpio_pci_dev->dev, led);
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if (ret)
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return ret;
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ret = device_create_file(led->dev, &dev_attr_blink);
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if (ret)
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led_classdev_unregister(led);
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return ret;
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}
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static void unregister_nasgpio_led(int led_nr)
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{
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struct led_classdev *led = get_classdev_for_led_nr(led_nr);
|
|
led_classdev_unregister(led);
|
|
device_remove_file(led->dev, &dev_attr_blink);
|
|
}
|
|
/*
|
|
* module load/initialization
|
|
*/
|
|
static int __init nas_gpio_init(void)
|
|
{
|
|
int i;
|
|
int ret = 0;
|
|
int nr_devices = 0;
|
|
|
|
nr_devices = dmi_check_system(nas_led_whitelist);
|
|
if (nodetect) {
|
|
pr_info("skipping hardware autodetection\n");
|
|
pr_info("Please send 'dmidecode' output to dave@sr71.net\n");
|
|
nr_devices++;
|
|
}
|
|
|
|
if (nr_devices <= 0) {
|
|
pr_info("no LED devices found\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
pr_info("registering PCI driver\n");
|
|
ret = pci_register_driver(&nas_gpio_pci_driver);
|
|
if (ret)
|
|
return ret;
|
|
for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++) {
|
|
ret = register_nasgpio_led(i);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
/*
|
|
* When the system powers on, the BIOS leaves the power
|
|
* light blue and blinking. This will turn it solid
|
|
* amber once the driver is loaded.
|
|
*/
|
|
set_power_light_amber_noblink();
|
|
return 0;
|
|
out_err:
|
|
for (i--; i >= 0; i--)
|
|
unregister_nasgpio_led(i);
|
|
pci_unregister_driver(&nas_gpio_pci_driver);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* module unload
|
|
*/
|
|
static void __exit nas_gpio_exit(void)
|
|
{
|
|
int i;
|
|
pr_info("Unregistering driver\n");
|
|
for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++)
|
|
unregister_nasgpio_led(i);
|
|
pci_unregister_driver(&nas_gpio_pci_driver);
|
|
}
|
|
|
|
module_init(nas_gpio_init);
|
|
module_exit(nas_gpio_exit);
|