patch-2.4.19 linux-2.4.19/arch/sparc/kernel/apc.c

• Lines: 172
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/sparc/kernel/apc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/sparc/kernel/apc.c linux-2.4.19/arch/sparc/kernel/apc.c
@@ -0,0 +1,171 @@
+/* apc - Driver implementation for power management functions
+ * of Aurora Personality Chip (APC) on SPARCstation-4/5 and
+ * derivatives.
+ *
+ * Copyright (c) 2002 Eric Brower (ebrower@usa.net)
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/pm.h>
+
+#include <asm/io.h>
+#include <asm/sbus.h>
+#include <asm/oplib.h>
+#include <asm/uaccess.h>
+#include <asm/auxio.h>
+#include <asm/apc.h>
+
+/* Debugging
+ * 
+ * #define APC_DEBUG_LED
+ * #define APC_NO_IDLE
+ */
+
+#define APC_MINOR	MISC_DYNAMIC_MINOR
+#define APC_OBPNAME	"power-management"
+#define APC_DEVNAME "apc"
+
+volatile static u8 *regs; 
+static int apc_regsize;
+
+#define apc_readb(offs)			(sbus_readb(regs+offs))
+#define apc_writeb(val, offs) 	(sbus_writeb(val, regs+offs))
+
+/* 
+ * CPU idle callback function
+ * See .../arch/sparc/kernel/process.c
+ */
+void apc_swift_idle(void)
+{
+#ifdef APC_DEBUG_LED
+	set_auxio(0x00, AUXIO_LED); 
+#endif
+
+	apc_writeb(apc_readb(APC_IDLE_REG) | APC_IDLE_ON, APC_IDLE_REG);
+
+#ifdef APC_DEBUG_LED
+	set_auxio(AUXIO_LED, 0x00); 
+#endif
+} 
+
+static inline void apc_free(void)
+{
+	sbus_iounmap((unsigned long)regs, apc_regsize);
+}
+
+static int apc_open(struct inode *inode, struct file *f)
+{
+	return 0;
+}
+
+static int apc_release(struct inode *inode, struct file *f)
+{
+	return 0;
+}
+
+static int apc_ioctl(struct inode *inode, struct file *f, 
+		     unsigned int cmd, unsigned long arg)
+{
+	__u8 inarg;
+
+	switch (cmd) {
+		case APCIOCGFANCTL:
+			if(put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, (__u8*) arg)) {
+				return -EFAULT;
+			}
+			break;
+		case APCIOCGCPWR:
+			if(put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, (__u8*) arg)) {
+				return -EFAULT;
+			}
+			break;
+		case APCIOCGBPORT:
+			if(put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, (__u8*) arg)) {
+				return -EFAULT;
+			}
+			break;
+
+		case APCIOCSFANCTL:
+			if(get_user(inarg, (__u8*) arg)) {
+				return -EFAULT;
+			}
+			apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG);
+			break;
+		case APCIOCSCPWR:
+			if(get_user(inarg, (__u8*) arg)) {
+				return -EFAULT;
+			}
+			apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG);
+			break;
+		case APCIOCSBPORT:
+			if(get_user(inarg, (__u8*) arg)) {
+				return -EFAULT;
+			}
+			apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG);
+			break;
+		default:
+			return -EINVAL;
+	};
+
+	return 0;
+}
+
+static struct file_operations apc_fops = {
+	ioctl:		apc_ioctl,
+	open:		apc_open,
+	release:	apc_release,
+};
+
+static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops };
+
+static int __init apc_probe(void)
+{
+	struct sbus_bus *sbus = NULL;
+	struct sbus_dev *sdev = NULL;
+	int iTmp = 0;
+	for_each_sbus(sbus) {
+		for_each_sbusdev(sdev, sbus) {
+			if (!strcmp(sdev->prom_name, APC_OBPNAME)) {
+				goto sbus_done;
+			}
+		}
+	}
+
+sbus_done:
+	if (!sdev) {
+		return -ENODEV;
+	}
+
+	apc_regsize = sdev->reg_addrs[0].reg_size;
+	regs = (u8*) sbus_ioremap(&sdev->resource[0], 0, 
+				   apc_regsize, APC_OBPNAME);
+	if(NULL == regs) {
+		printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME);
+		return -ENODEV;
+	}
+
+	iTmp = misc_register(&apc_miscdev);
+	if (iTmp != 0) {
+		printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME);
+		apc_free();
+		return -ENODEV;
+	}
+
+#ifndef APC_NO_IDLE	
+	/* Assign power management IDLE handler */
+	pm_idle = apc_swift_idle;	
+#endif
+
+	printk(KERN_INFO "%s: power management initialized\n", APC_DEVNAME);
+	return 0;
+}
+
+/* This driver is not critical to the boot process
+ * and is easiest to ioremap when SBus is already
+ * initialized, so we install ourselves thusly:
+ */
+__initcall(apc_probe);