1 /* pmc - Driver implementation for power management functions 2 * of Power Management Controller (PMC) on SPARCstation-Voyager. 3 * 4 * Copyright (c) 2002 Eric Brower (ebrower@usa.net) 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/fs.h> 9 #include <linux/errno.h> 10 #include <linux/init.h> 11 #include <linux/miscdevice.h> 12 #include <linux/pm.h> 13 14 #include <asm/io.h> 15 #include <asm/sbus.h> 16 #include <asm/oplib.h> 17 #include <asm/uaccess.h> 18 #include <asm/auxio.h> 19 20 /* Debug 21 * 22 * #define PMC_DEBUG_LED 23 * #define PMC_NO_IDLE 24 */ 25 26 #define PMC_MINOR MISC_DYNAMIC_MINOR 27 #define PMC_OBPNAME "SUNW,pmc" 28 #define PMC_DEVNAME "pmc" 29 30 #define PMC_IDLE_REG 0x00 31 #define PMC_IDLE_ON 0x01 32 33 volatile static u8 __iomem *regs; 34 static int pmc_regsize; 35 36 #define pmc_readb(offs) (sbus_readb(regs+offs)) 37 #define pmc_writeb(val, offs) (sbus_writeb(val, regs+offs)) 38 39 /* 40 * CPU idle callback function 41 * See .../arch/sparc/kernel/process.c 42 */ 43 void pmc_swift_idle(void) 44 { 45 #ifdef PMC_DEBUG_LED 46 set_auxio(0x00, AUXIO_LED); 47 #endif 48 49 pmc_writeb(pmc_readb(PMC_IDLE_REG) | PMC_IDLE_ON, PMC_IDLE_REG); 50 51 #ifdef PMC_DEBUG_LED 52 set_auxio(AUXIO_LED, 0x00); 53 #endif 54 } 55 56 static inline void pmc_free(void) 57 { 58 sbus_iounmap(regs, pmc_regsize); 59 } 60 61 static int __init pmc_probe(void) 62 { 63 struct sbus_bus *sbus = NULL; 64 struct sbus_dev *sdev = NULL; 65 for_each_sbus(sbus) { 66 for_each_sbusdev(sdev, sbus) { 67 if (!strcmp(sdev->prom_name, PMC_OBPNAME)) { 68 goto sbus_done; 69 } 70 } 71 } 72 73 sbus_done: 74 if (!sdev) { 75 return -ENODEV; 76 } 77 78 pmc_regsize = sdev->reg_addrs[0].reg_size; 79 regs = sbus_ioremap(&sdev->resource[0], 0, 80 pmc_regsize, PMC_OBPNAME); 81 if (!regs) { 82 printk(KERN_ERR "%s: unable to map registers\n", PMC_DEVNAME); 83 return -ENODEV; 84 } 85 86 #ifndef PMC_NO_IDLE 87 /* Assign power management IDLE handler */ 88 pm_idle = pmc_swift_idle; 89 #endif 90 91 printk(KERN_INFO "%s: power management initialized\n", PMC_DEVNAME); 92 return 0; 93 } 94 95 /* This driver is not critical to the boot process 96 * and is easiest to ioremap when SBus is already 97 * initialized, so we install ourselves thusly: 98 */ 99 __initcall(pmc_probe); 100