^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* apc - Driver implementation for power management functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * of Aurora Personality Chip (APC) on SPARCstation-4/5 and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * derivatives.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (c) 2002 Eric Brower (ebrower@usa.net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/oplib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/auxio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/apc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /* Debugging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * #define APC_DEBUG_LED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define APC_MINOR MISC_DYNAMIC_MINOR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define APC_OBPNAME "power-management"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define APC_DEVNAME "apc"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static u8 __iomem *regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static int apc_no_idle = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define apc_readb(offs) (sbus_readb(regs+offs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define apc_writeb(val, offs) (sbus_writeb(val, regs+offs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /* Specify "apc=noidle" on the kernel command line to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * disable APC CPU standby support. Certain prototype
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * systems (SPARCstation-Fox) do not play well with APC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * CPU idle, so disable this if your system has APC and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * crashes randomly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static int __init apc_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if(!strncmp(str, "noidle", strlen("noidle"))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) apc_no_idle = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) __setup("apc=", apc_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * CPU idle callback function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * See .../arch/sparc/kernel/process.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static void apc_swift_idle(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #ifdef APC_DEBUG_LED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) set_auxio(0x00, AUXIO_LED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) apc_writeb(apc_readb(APC_IDLE_REG) | APC_IDLE_ON, APC_IDLE_REG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #ifdef APC_DEBUG_LED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) set_auxio(AUXIO_LED, 0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static inline void apc_free(struct platform_device *op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) of_iounmap(&op->resource[0], regs, resource_size(&op->resource[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static int apc_open(struct inode *inode, struct file *f)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static int apc_release(struct inode *inode, struct file *f)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static long apc_ioctl(struct file *f, unsigned int cmd, unsigned long __arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) __u8 inarg, __user *arg = (__u8 __user *) __arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) case APCIOCGFANCTL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (put_user(apc_readb(APC_FANCTL_REG) & APC_REGMASK, arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) case APCIOCGCPWR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (put_user(apc_readb(APC_CPOWER_REG) & APC_REGMASK, arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) case APCIOCGBPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (put_user(apc_readb(APC_BPORT_REG) & APC_BPMASK, arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) case APCIOCSFANCTL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (get_user(inarg, arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) apc_writeb(inarg & APC_REGMASK, APC_FANCTL_REG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) case APCIOCSCPWR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (get_user(inarg, arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) apc_writeb(inarg & APC_REGMASK, APC_CPOWER_REG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) case APCIOCSBPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (get_user(inarg, arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) apc_writeb(inarg & APC_BPMASK, APC_BPORT_REG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static const struct file_operations apc_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .unlocked_ioctl = apc_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .open = apc_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .release = apc_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .llseek = noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static struct miscdevice apc_miscdev = { APC_MINOR, APC_DEVNAME, &apc_fops };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static int apc_probe(struct platform_device *op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) regs = of_ioremap(&op->resource[0], 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) resource_size(&op->resource[0]), APC_OBPNAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (!regs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) printk(KERN_ERR "%s: unable to map registers\n", APC_DEVNAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) err = misc_register(&apc_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) printk(KERN_ERR "%s: unable to register device\n", APC_DEVNAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) apc_free(op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /* Assign power management IDLE handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (!apc_no_idle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) sparc_idle = apc_swift_idle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) printk(KERN_INFO "%s: power management initialized%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) APC_DEVNAME, apc_no_idle ? " (CPU idle disabled)" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static const struct of_device_id apc_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) .name = APC_OBPNAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) MODULE_DEVICE_TABLE(of, apc_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static struct platform_driver apc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) .name = "apc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) .of_match_table = apc_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) .probe = apc_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static int __init apc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return platform_driver_register(&apc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* This driver is not critical to the boot process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * and is easiest to ioremap when SBus is already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * initialized, so we install ourselves thusly:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) __initcall(apc_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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