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

• Lines: 100
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/sparc/kernel/pmc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/sparc/kernel/pmc.c linux-2.4.19/arch/sparc/kernel/pmc.c
@@ -0,0 +1,99 @@
+/* pmc - Driver implementation for power management functions
+ * of Power Management Controller (PMC) on SPARCstation-Voyager.
+ *
+ * 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>
+
+/* Debug
+ *
+ * #define PMC_DEBUG_LED
+ * #define PMC_NO_IDLE
+ */
+
+#define PMC_MINOR	MISC_DYNAMIC_MINOR
+#define PMC_OBPNAME	"SUNW,pmc"
+#define PMC_DEVNAME "pmc"
+
+#define PMC_IDLE_REG	0x00
+#define PMC_IDLE_ON		0x01
+
+volatile static u8 *regs; 
+static int pmc_regsize;
+
+#define pmc_readb(offs)			(sbus_readb(regs+offs))
+#define pmc_writeb(val, offs) 	(sbus_writeb(val, regs+offs))
+
+/* 
+ * CPU idle callback function
+ * See .../arch/sparc/kernel/process.c
+ */
+void pmc_swift_idle(void)
+{
+#ifdef PMC_DEBUG_LED
+	set_auxio(0x00, AUXIO_LED); 
+#endif
+
+	pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG);
+
+#ifdef PMC_DEBUG_LED
+	set_auxio(AUXIO_LED, 0x00); 
+#endif
+} 
+
+static inline void pmc_free(void)
+{
+	sbus_iounmap((unsigned long)regs, pmc_regsize);
+}
+
+static int __init pmc_probe(void)
+{
+	struct sbus_bus *sbus = NULL;
+	struct sbus_dev *sdev = NULL;
+	for_each_sbus(sbus) {
+		for_each_sbusdev(sdev, sbus) {
+			if (!strcmp(sdev->prom_name, PMC_OBPNAME)) {
+				goto sbus_done;
+			}
+		}
+	}
+
+sbus_done:
+	if (!sdev) {
+		return -ENODEV;
+	}
+
+	pmc_regsize = sdev->reg_addrs[0].reg_size;
+	regs = (u8*) sbus_ioremap(&sdev->resource[0], 0, 
+				   pmc_regsize, PMC_OBPNAME);
+	if(NULL == regs) {
+		printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME);
+		return -ENODEV;
+	}
+
+#ifndef PMC_NO_IDLE
+	/* Assign power management IDLE handler */
+	pm_idle = pmc_swift_idle;	
+#endif
+
+	printk(KERN_INFO "%s: power management initialized\n", PMC_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(pmc_probe);