Add Sparc Voyager power management support.

arch/sparc/Config.help

@@ -34,6 +34,11 @@ CONFIG_SPARC32
   maintains both the SPARC32 and SPARC64 ports; its web page is
   available at <http://www.ultralinux.org/>.
 
+SPARC power management support
+CONFIG_SUN_PM
+  Enable power management and CPU standby features on supported 
+  SPARC platforms. 
+
 CONFIG_BLK_DEV_FD
   If you want to use the floppy disk drive(s) of your PC under Linux,
   say Y. Information about this driver, especially important for IBM

arch/sparc/config.in

@@ -38,6 +38,7 @@ define_bool CONFIG_SUN_AUXIO y
 define_bool CONFIG_SUN_IO y
 define_bool CONFIG_RWSEM_GENERIC_SPINLOCK y
 define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM n
+define_bool CONFIG_SUN_PM y
 
 bool 'Support for SUN4 machines (disables SUN4[CDM] support)' CONFIG_SUN4
 if [ "$CONFIG_SUN4" != "y" ]; then

arch/sparc/defconfig

@@ -48,6 +48,7 @@ CONFIG_SUN_AUXIO=y
 CONFIG_SUN_IO=y
 CONFIG_RWSEM_GENERIC_SPINLOCK=y
 # CONFIG_RWSEM_XCHGADD_ALGORITHM is not set
+CONFIG_SUN_PM=y
 # CONFIG_SUN4 is not set
 # CONFIG_PCI is not set
 CONFIG_SUN_OPENPROMFS=m

arch/sparc/kernel/Makefile

@@ -32,6 +32,7 @@ obj-$(CONFIG_SUN4) += sun4setup.o
 obj-$(CONFIG_SMP) += trampoline.o smp.o sun4m_smp.o sun4d_smp.o
 obj-$(CONFIG_SUN_AUXIO) += auxio.o
 obj-$(CONFIG_PCI) += ebus.o
+obj-$(CONFIG_SUN_PM) += apc.o pmc.o
 
 ifdef CONFIG_SUNOS_EMUL
 obj-y += sys_sunos.o sunos_ioctl.o

arch/sparc/kernel/apc.c

+/* $Id$
+ *
+ * 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);

arch/sparc/kernel/pmc.c

+/* $Id$
+ *
+ * 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);

arch/sparc/kernel/process.c

@@ -27,6 +27,7 @@
 #include <linux/smp_lock.h>
 #include <linux/reboot.h>
 #include <linux/delay.h>
+#include <linux/pm.h>
 
 #include <asm/auxio.h>
 #include <asm/oplib.h>
@@ -40,6 +41,19 @@
 #include <asm/psr.h>
 #include <asm/elf.h>
 
+/* 
+ * Power management idle function 
+ * Set in pm platform drivers
+ */
+void (*pm_idle)(void);
+
+/* 
+ * Power-off handler instantiation for pm.h compliance
+ * This is done via auxio, but could be used as a fallback
+ * handler when auxio is not present-- unused for now...
+ */
+void (*pm_power_off)(void);
+
 extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
 
 struct task_struct *last_task_used_math = NULL;
@@ -91,8 +105,13 @@ int cpu_idle(void)
 			}
 			restore_flags(flags);
 		}
-		check_pgt_cache();
+
+		while((!current->need_resched) && pm_idle) {
+				(*pm_idle)();
+		}
+
 		schedule();
+		check_pgt_cache();
 	}
 	ret = 0;
 out:

arch/sparc/kernel/sparc_ksyms.c

@@ -22,6 +22,7 @@
 #ifdef CONFIG_PCI
 #include <linux/pci.h>
 #endif
+#include <linux/pm.h>
 
 #include <asm/oplib.h>
 #include <asm/delay.h>
@@ -295,3 +296,6 @@ EXPORT_SYMBOL_DOT(mul);
 EXPORT_SYMBOL_DOT(umul);
 EXPORT_SYMBOL_DOT(div);
 EXPORT_SYMBOL_DOT(udiv);
+
+/* Sun Power Management Idle Handler */
+EXPORT_SYMBOL(pm_idle);

include/asm-sparc/apc.h

+/* $Id$
+ *
+ * apc - Driver definitions for power management functions
+ * of Aurora Personality Chip (APC) on SPARCstation-4/5 and 
+ * derivatives
+ *
+ * Copyright (c) 2001 Eric Brower (ebrower@usa.net)
+ *
+ */
+
+#ifndef _SPARC_APC_H
+#define _SPARC_APC_H
+
+#include <linux/ioctl.h>
+
+#define APC_IOC	'A'
+
+#define APCIOCGFANCTL _IOR(APC_IOC, 0x00, int)	/* Get fan speed	*/
+#define APCIOCSFANCTL _IOW(APC_IOC, 0x01, int)	/* Set fan speed	*/
+
+#define APCIOCGCPWR   _IOR(APC_IOC, 0x02, int)	/* Get CPOWER state	*/
+#define APCIOCSCPWR   _IOW(APC_IOC, 0x03, int)	/* Set CPOWER state	*/
+
+#define APCIOCGBPORT   _IOR(APC_IOC, 0x04, int)	/* Get BPORT state 	*/
+#define APCIOCSBPORT   _IOW(APC_IOC, 0x05, int)	/* Set BPORT state	*/
+
+/*
+ * Register offsets
+ */
+#define APC_IDLE_REG	0x00
+#define APC_FANCTL_REG	0x20
+#define APC_CPOWER_REG	0x24
+#define APC_BPORT_REG	0x30
+
+#define APC_REGMASK		0x01
+#define APC_BPMASK		0x03
+
+/*
+ * IDLE - CPU standby values (set to initiate standby)
+ */
+#define APC_IDLE_ON		0x01
+
+/*
+ * FANCTL - Fan speed control state values
+ */
+#define APC_FANCTL_HI	0x00	/* Fan speed high	*/
+#define APC_FANCTL_LO	0x01	/* Fan speed low	*/
+
+/*
+ * CPWR - Convenience power outlet state values 
+ */
+#define APC_CPOWER_ON	0x00	/* Conv power on	*/
+#define APC_CPOWER_OFF	0x01	/* Conv power off	*/
+
+/*
+ * BPA/BPB - Read-Write "Bit Ports" state values (reset to 0 at power-on)
+ *
+ * WARNING: Internal usage of bit ports is platform dependent--
+ * don't modify BPORT settings unless you know what you are doing.
+ * 
+ * On SS5 BPA seems to toggle onboard ethernet loopback... -E
+ */
+#define APC_BPORT_A		0x01	/* Bit Port A		*/
+#define APC_BPORT_B		0x02	/* Bit Port B		*/
+
+#endif /* !(_SPARC_APC_H) */