Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/misc/hdpuftrs/hdpu_cpustate.c b/drivers/misc/hdpuftrs/hdpu_cpustate.c
new file mode 100644
index 0000000..7501fab
--- /dev/null
+++ b/drivers/misc/hdpuftrs/hdpu_cpustate.c
@@ -0,0 +1,234 @@
+/*
+ * 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");