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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sparc/kernel/apc.c
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
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Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'arch/sparc/kernel/apc.c')
-rw-r--r--arch/sparc/kernel/apc.c186
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 0000000..406dd94
--- /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);
+
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