|
|
@@ -1,256 +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/module.h>
|
|
|
-#include <linux/kernel.h>
|
|
|
-#include <linux/spinlock.h>
|
|
|
-#include <linux/smp_lock.h>
|
|
|
-#include <linux/miscdevice.h>
|
|
|
-#include <linux/proc_fs.h>
|
|
|
-#include <linux/hdpu_features.h>
|
|
|
-#include <linux/platform_device.h>
|
|
|
-#include <asm/uaccess.h>
|
|
|
-#include <linux/seq_file.h>
|
|
|
-#include <asm/io.h>
|
|
|
-
|
|
|
-#define SKY_CPUSTATE_VERSION "1.1"
|
|
|
-
|
|
|
-static int hdpu_cpustate_probe(struct platform_device *pdev);
|
|
|
-static int hdpu_cpustate_remove(struct platform_device *pdev);
|
|
|
-
|
|
|
-static unsigned char cpustate_get_state(void);
|
|
|
-static int cpustate_proc_open(struct inode *inode, struct file *file);
|
|
|
-static int cpustate_proc_read(struct seq_file *seq, void *offset);
|
|
|
-
|
|
|
-static struct cpustate_t cpustate;
|
|
|
-
|
|
|
-static const struct file_operations proc_cpustate = {
|
|
|
- .open = cpustate_proc_open,
|
|
|
- .read = seq_read,
|
|
|
- .llseek = seq_lseek,
|
|
|
- .release = single_release,
|
|
|
- .owner = THIS_MODULE,
|
|
|
-};
|
|
|
-
|
|
|
-static int cpustate_proc_open(struct inode *inode, struct file *file)
|
|
|
-{
|
|
|
- return single_open(file, cpustate_proc_read, NULL);
|
|
|
-}
|
|
|
-
|
|
|
-static int cpustate_proc_read(struct seq_file *seq, void *offset)
|
|
|
-{
|
|
|
- seq_printf(seq, "CPU State: %04x\n", cpustate_get_state());
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-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;
|
|
|
-}
|
|
|
-
|
|
|
-static unsigned char cpustate_get_state(void)
|
|
|
-{
|
|
|
-
|
|
|
- return cpustate.cached_val;
|
|
|
-}
|
|
|
-
|
|
|
-static 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)
|
|
|
-{
|
|
|
- int ret;
|
|
|
-
|
|
|
- lock_kernel();
|
|
|
- ret = cpustate_get_ref((file->f_flags & O_EXCL));
|
|
|
- unlock_kernel();
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static int cpustate_release(struct inode *inode, struct file *file)
|
|
|
-{
|
|
|
- return cpustate_free_ref();
|
|
|
-}
|
|
|
-
|
|
|
-static struct platform_driver hdpu_cpustate_driver = {
|
|
|
- .probe = hdpu_cpustate_probe,
|
|
|
- .remove = hdpu_cpustate_remove,
|
|
|
- .driver = {
|
|
|
- .name = HDPU_CPUSTATE_NAME,
|
|
|
- .owner = THIS_MODULE,
|
|
|
- },
|
|
|
-};
|
|
|
-
|
|
|
-/*
|
|
|
- * The various file operations we support.
|
|
|
- */
|
|
|
-static const struct file_operations cpustate_fops = {
|
|
|
- .owner = THIS_MODULE,
|
|
|
- .open = cpustate_open,
|
|
|
- .release = cpustate_release,
|
|
|
- .read = cpustate_read,
|
|
|
- .write = cpustate_write,
|
|
|
- .llseek = no_llseek,
|
|
|
-};
|
|
|
-
|
|
|
-static struct miscdevice cpustate_dev = {
|
|
|
- .minor = MISC_DYNAMIC_MINOR,
|
|
|
- .name = "sky_cpustate",
|
|
|
- .fops = &cpustate_fops,
|
|
|
-};
|
|
|
-
|
|
|
-static int hdpu_cpustate_probe(struct platform_device *pdev)
|
|
|
-{
|
|
|
- struct resource *res;
|
|
|
- struct proc_dir_entry *proc_de;
|
|
|
- int ret;
|
|
|
-
|
|
|
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
- if (!res) {
|
|
|
- printk(KERN_ERR "sky_cpustate: "
|
|
|
- "Invalid memory resource.\n");
|
|
|
- return -EINVAL;
|
|
|
- }
|
|
|
- cpustate.set_addr = (unsigned long *)res->start;
|
|
|
- cpustate.clr_addr = (unsigned long *)res->end - 1;
|
|
|
-
|
|
|
- ret = misc_register(&cpustate_dev);
|
|
|
- if (ret) {
|
|
|
- printk(KERN_WARNING "sky_cpustate: "
|
|
|
- "Unable to register misc device.\n");
|
|
|
- cpustate.set_addr = NULL;
|
|
|
- cpustate.clr_addr = NULL;
|
|
|
- return ret;
|
|
|
- }
|
|
|
-
|
|
|
- proc_de = proc_create("sky_cpustate", 0666, NULL, &proc_cpustate);
|
|
|
- if (!proc_de) {
|
|
|
- printk(KERN_WARNING "sky_cpustate: "
|
|
|
- "Unable to create proc entry\n");
|
|
|
- }
|
|
|
-
|
|
|
- printk(KERN_INFO "Sky CPU State Driver v" SKY_CPUSTATE_VERSION "\n");
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int hdpu_cpustate_remove(struct platform_device *pdev)
|
|
|
-{
|
|
|
- cpustate.set_addr = NULL;
|
|
|
- cpustate.clr_addr = NULL;
|
|
|
-
|
|
|
- remove_proc_entry("sky_cpustate", NULL);
|
|
|
- misc_deregister(&cpustate_dev);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int __init cpustate_init(void)
|
|
|
-{
|
|
|
- return platform_driver_register(&hdpu_cpustate_driver);
|
|
|
-}
|
|
|
-
|
|
|
-static void __exit cpustate_exit(void)
|
|
|
-{
|
|
|
- platform_driver_unregister(&hdpu_cpustate_driver);
|
|
|
-}
|
|
|
-
|
|
|
-module_init(cpustate_init);
|
|
|
-module_exit(cpustate_exit);
|
|
|
-
|
|
|
-MODULE_AUTHOR("Brian Waite");
|
|
|
-MODULE_LICENSE("GPL");
|
|
|
-MODULE_ALIAS("platform:" HDPU_CPUSTATE_NAME);
|
Benjamin Herrenschmidt