/* 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 __iomem *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(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 = sbus_ioremap(&sdev->resource[0], 0, pmc_regsize, PMC_OBPNAME); if (!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);