diff options
Diffstat (limited to 'drivers/misc/hdpuftrs/hdpu_cpustate.c')
| -rw-r--r-- | drivers/misc/hdpuftrs/hdpu_cpustate.c | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/drivers/misc/hdpuftrs/hdpu_cpustate.c b/drivers/misc/hdpuftrs/hdpu_cpustate.c deleted file mode 100644 index 7501fab349e..00000000000 --- a/drivers/misc/hdpuftrs/hdpu_cpustate.c +++ /dev/null @@ -1,234 +0,0 @@ -/* - * Sky CPU State Driver - * - * Copyright (C) 2002 Brian Waite - * - * This driver allows use of the CPU state bits - * It exports the /dev/sky_cpustate and also - * /proc/sky_cpustate pseudo-file for status information. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - */ - -#include <linux/version.h> -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/spinlock.h> -#include <linux/miscdevice.h> -#include <linux/pci.h> -#include <linux/proc_fs.h> -#include <linux/device.h> -#include <asm/uaccess.h> -#include <linux/hdpu_features.h> - -#define SKY_CPUSTATE_VERSION "1.1" - -static int hdpu_cpustate_probe(struct device *ddev); -static int hdpu_cpustate_remove(struct device *ddev); - -struct cpustate_t cpustate; - -static int cpustate_get_ref(int excl) -{ - - int retval = -EBUSY; - - spin_lock(&cpustate.lock); - - if (cpustate.excl) - goto out_busy; - - if (excl) { - if (cpustate.open_count) - goto out_busy; - cpustate.excl = 1; - } - - cpustate.open_count++; - retval = 0; - - out_busy: - spin_unlock(&cpustate.lock); - return retval; -} - -static int cpustate_free_ref(void) -{ - - spin_lock(&cpustate.lock); - - cpustate.excl = 0; - cpustate.open_count--; - - spin_unlock(&cpustate.lock); - return 0; -} - -unsigned char cpustate_get_state(void) -{ - - return cpustate.cached_val; -} - -void cpustate_set_state(unsigned char new_state) -{ - unsigned int state = (new_state << 21); - -#ifdef DEBUG_CPUSTATE - printk("CPUSTATE -> 0x%x\n", new_state); -#endif - spin_lock(&cpustate.lock); - cpustate.cached_val = new_state; - writel((0xff << 21), cpustate.clr_addr); - writel(state, cpustate.set_addr); - spin_unlock(&cpustate.lock); -} - -/* - * Now all the various file operations that we export. - */ - -static ssize_t cpustate_read(struct file *file, char *buf, - size_t count, loff_t * ppos) -{ - unsigned char data; - - if (count < 0) - return -EFAULT; - if (count == 0) - return 0; - - data = cpustate_get_state(); - if (copy_to_user(buf, &data, sizeof(unsigned char))) - return -EFAULT; - return sizeof(unsigned char); -} - -static ssize_t cpustate_write(struct file *file, const char *buf, - size_t count, loff_t * ppos) -{ - unsigned char data; - - if (count < 0) - return -EFAULT; - - if (count == 0) - return 0; - - if (copy_from_user((unsigned char *)&data, buf, sizeof(unsigned char))) - return -EFAULT; - - cpustate_set_state(data); - return sizeof(unsigned char); -} - -static int cpustate_open(struct inode *inode, struct file *file) -{ - return cpustate_get_ref((file->f_flags & O_EXCL)); -} - -static int cpustate_release(struct inode *inode, struct file *file) -{ - return cpustate_free_ref(); -} - -/* - * Info exported via "/proc/sky_cpustate". - */ -static int cpustate_read_proc(char *page, char **start, off_t off, - int count, int *eof, void *data) -{ - char *p = page; - int len = 0; - - p += sprintf(p, "CPU State: %04x\n", cpustate_get_state()); - len = p - page; - - if (len <= off + count) - *eof = 1; - *start = page + off; - len -= off; - if (len > count) - len = count; - if (len < 0) - len = 0; - return len; -} - -static struct device_driver hdpu_cpustate_driver = { - .name = HDPU_CPUSTATE_NAME, - .bus = &platform_bus_type, - .probe = hdpu_cpustate_probe, - .remove = hdpu_cpustate_remove, -}; - -/* - * The various file operations we support. - */ -static struct file_operations cpustate_fops = { - owner:THIS_MODULE, - open:cpustate_open, - release:cpustate_release, - read:cpustate_read, - write:cpustate_write, - fasync:NULL, - poll:NULL, - ioctl:NULL, - llseek:no_llseek, - -}; - -static struct miscdevice cpustate_dev = { - MISC_DYNAMIC_MINOR, - "sky_cpustate", - &cpustate_fops -}; - -static int hdpu_cpustate_probe(struct device *ddev) -{ - struct platform_device *pdev = to_platform_device(ddev); - struct resource *res; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - cpustate.set_addr = (unsigned long *)res->start; - cpustate.clr_addr = (unsigned long *)res->end - 1; - - misc_register(&cpustate_dev); - create_proc_read_entry("sky_cpustate", 0, 0, cpustate_read_proc, NULL); - - printk(KERN_INFO "Sky CPU State Driver v" SKY_CPUSTATE_VERSION "\n"); - return 0; -} -static int hdpu_cpustate_remove(struct device *ddev) -{ - - cpustate.set_addr = 0; - cpustate.clr_addr = 0; - - remove_proc_entry("sky_cpustate", NULL); - misc_deregister(&cpustate_dev); - return 0; - -} - -static int __init cpustate_init(void) -{ - int rc; - rc = driver_register(&hdpu_cpustate_driver); - return rc; -} - -static void __exit cpustate_exit(void) -{ - driver_unregister(&hdpu_cpustate_driver); -} - -module_init(cpustate_init); -module_exit(cpustate_exit); - -MODULE_AUTHOR("Brian Waite"); -MODULE_LICENSE("GPL"); |