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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | /* 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 const 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); |