1 files changed, 186 insertions, 0 deletions

diff --git a/arch/sparc/kernel/apc.c b/arch/sparc/kernel/apc.c
new file mode 100644
index 000000000000..406dd94afb45
--- /dev/null
+++ b/arch/sparc/kernel/apc.c
@@ -0,0 +1,186 @@
+/* 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_MINOR       MISC_DYNAMIC_MINOR
+#define APC_OBPNAME     "power-management"
+#define APC_DEVNAME "apc"
+
+volatile static u8 __iomem *regs; 
+static int apc_regsize;
+static int apc_no_idle __initdata = 0;
+
+#define apc_readb(offs)                 (sbus_readb(regs+offs))
+#define apc_writeb(val, offs)   (sbus_writeb(val, regs+offs))
+
+/* Specify "apc=noidle" on the kernel command line to 
+ * disable APC CPU standby support.  Certain prototype
+ * systems (SPARCstation-Fox) do not play well with APC
+ * CPU idle, so disable this if your system has APC and 
+ * crashes randomly.
+ */
+static int __init apc_setup(char *str) 
+{
+        if(!strncmp(str, "noidle", strlen("noidle"))) {
+                apc_no_idle = 1;
+                return 1;
+        }
+        return 0;
+}
+__setup("apc=", apc_setup);
+
+/* 
+ * 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(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, __user *arg;
+
+        arg = (__u8 __user *) __arg;
+        switch (cmd) {
+        case APCIOCGFANCTL:
+                if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg))
+                                return -EFAULT;
+                break;
+
+        case APCIOCGCPWR:
+                if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg))
+                        return -EFAULT;
+                break;
+
+        case APCIOCGBPORT:
+                if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg))
+                        return -EFAULT;
+                break;
+
+        case APCIOCSFANCTL:
+                if (get_user(inarg, arg))
+                        return -EFAULT;
+                apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG);
+                break;
+        case APCIOCSCPWR:
+                if (get_user(inarg, arg))
+                        return -EFAULT;
+                apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG);
+                break;
+        case APCIOCSBPORT:
+                if (get_user(inarg, 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 = sbus_ioremap(&sdev->resource[0], 0, 
+                                   apc_regsize, APC_OBPNAME);
+        if(!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;
+        }
+
+        /* Assign power management IDLE handler */
+        if(!apc_no_idle)
+                pm_idle = apc_swift_idle;       
+
+        printk(KERN_INFO "%s: power management initialized%s\n", 
+                APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : "");
+        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);
+