11802d0beSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 20d7cd855SJeremy Kerr /* 30d7cd855SJeremy Kerr * OPAL Runtime Diagnostics interface driver 40d7cd855SJeremy Kerr * Supported on POWERNV platform 50d7cd855SJeremy Kerr * 60d7cd855SJeremy Kerr * Copyright IBM Corporation 2015 70d7cd855SJeremy Kerr */ 80d7cd855SJeremy Kerr 90d7cd855SJeremy Kerr #define pr_fmt(fmt) "opal-prd: " fmt 100d7cd855SJeremy Kerr 110d7cd855SJeremy Kerr #include <linux/kernel.h> 120d7cd855SJeremy Kerr #include <linux/module.h> 130d7cd855SJeremy Kerr #include <linux/platform_device.h> 140d7cd855SJeremy Kerr #include <linux/miscdevice.h> 150d7cd855SJeremy Kerr #include <linux/fs.h> 160d7cd855SJeremy Kerr #include <linux/of.h> 170d7cd855SJeremy Kerr #include <linux/of_address.h> 180d7cd855SJeremy Kerr #include <linux/poll.h> 190d7cd855SJeremy Kerr #include <linux/mm.h> 200d7cd855SJeremy Kerr #include <linux/slab.h> 210d7cd855SJeremy Kerr #include <asm/opal-prd.h> 220d7cd855SJeremy Kerr #include <asm/opal.h> 230d7cd855SJeremy Kerr #include <asm/io.h> 247c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 250d7cd855SJeremy Kerr 260d7cd855SJeremy Kerr 27fb248c31SOliver O'Halloran /* 287185795aSJeremy Kerr * The msg member must be at the end of the struct, as it's followed by the 297185795aSJeremy Kerr * message data. 307185795aSJeremy Kerr */ 310d7cd855SJeremy Kerr struct opal_prd_msg_queue_item { 320d7cd855SJeremy Kerr struct list_head list; 337185795aSJeremy Kerr struct opal_prd_msg_header msg; 340d7cd855SJeremy Kerr }; 350d7cd855SJeremy Kerr 360d7cd855SJeremy Kerr static struct device_node *prd_node; 370d7cd855SJeremy Kerr static LIST_HEAD(opal_prd_msg_queue); 380d7cd855SJeremy Kerr static DEFINE_SPINLOCK(opal_prd_msg_queue_lock); 390d7cd855SJeremy Kerr static DECLARE_WAIT_QUEUE_HEAD(opal_prd_msg_wait); 400d7cd855SJeremy Kerr static atomic_t prd_usage; 410d7cd855SJeremy Kerr 420d7cd855SJeremy Kerr static bool opal_prd_range_is_valid(uint64_t addr, uint64_t size) 430d7cd855SJeremy Kerr { 440d7cd855SJeremy Kerr struct device_node *parent, *node; 450d7cd855SJeremy Kerr bool found; 460d7cd855SJeremy Kerr 470d7cd855SJeremy Kerr if (addr + size < addr) 480d7cd855SJeremy Kerr return false; 490d7cd855SJeremy Kerr 500d7cd855SJeremy Kerr parent = of_find_node_by_path("/reserved-memory"); 510d7cd855SJeremy Kerr if (!parent) 520d7cd855SJeremy Kerr return false; 530d7cd855SJeremy Kerr 540d7cd855SJeremy Kerr found = false; 550d7cd855SJeremy Kerr 560d7cd855SJeremy Kerr for_each_child_of_node(parent, node) { 570d7cd855SJeremy Kerr uint64_t range_addr, range_size, range_end; 580d7cd855SJeremy Kerr const __be32 *addrp; 590d7cd855SJeremy Kerr const char *label; 600d7cd855SJeremy Kerr 610d7cd855SJeremy Kerr addrp = of_get_address(node, 0, &range_size, NULL); 620d7cd855SJeremy Kerr 630d7cd855SJeremy Kerr range_addr = of_read_number(addrp, 2); 640d7cd855SJeremy Kerr range_end = range_addr + range_size; 650d7cd855SJeremy Kerr 660d7cd855SJeremy Kerr label = of_get_property(node, "ibm,prd-label", NULL); 670d7cd855SJeremy Kerr 680d7cd855SJeremy Kerr /* PRD ranges need a label */ 690d7cd855SJeremy Kerr if (!label) 700d7cd855SJeremy Kerr continue; 710d7cd855SJeremy Kerr 720d7cd855SJeremy Kerr if (range_end <= range_addr) 730d7cd855SJeremy Kerr continue; 740d7cd855SJeremy Kerr 750d7cd855SJeremy Kerr if (addr >= range_addr && addr + size <= range_end) { 760d7cd855SJeremy Kerr found = true; 770d7cd855SJeremy Kerr of_node_put(node); 780d7cd855SJeremy Kerr break; 790d7cd855SJeremy Kerr } 800d7cd855SJeremy Kerr } 810d7cd855SJeremy Kerr 820d7cd855SJeremy Kerr of_node_put(parent); 830d7cd855SJeremy Kerr return found; 840d7cd855SJeremy Kerr } 850d7cd855SJeremy Kerr 860d7cd855SJeremy Kerr static int opal_prd_open(struct inode *inode, struct file *file) 870d7cd855SJeremy Kerr { 880d7cd855SJeremy Kerr /* 890d7cd855SJeremy Kerr * Prevent multiple (separate) processes from concurrent interactions 900d7cd855SJeremy Kerr * with the FW PRD channel 910d7cd855SJeremy Kerr */ 920d7cd855SJeremy Kerr if (atomic_xchg(&prd_usage, 1) == 1) 930d7cd855SJeremy Kerr return -EBUSY; 940d7cd855SJeremy Kerr 950d7cd855SJeremy Kerr return 0; 960d7cd855SJeremy Kerr } 970d7cd855SJeremy Kerr 980d7cd855SJeremy Kerr /* 990d7cd855SJeremy Kerr * opal_prd_mmap - maps firmware-provided ranges into userspace 1000d7cd855SJeremy Kerr * @file: file structure for the device 1010d7cd855SJeremy Kerr * @vma: VMA to map the registers into 1020d7cd855SJeremy Kerr */ 1030d7cd855SJeremy Kerr 1040d7cd855SJeremy Kerr static int opal_prd_mmap(struct file *file, struct vm_area_struct *vma) 1050d7cd855SJeremy Kerr { 1060d7cd855SJeremy Kerr size_t addr, size; 107d8ea782bSVaidyanathan Srinivasan pgprot_t page_prot; 1080d7cd855SJeremy Kerr 1090d7cd855SJeremy Kerr pr_devel("opal_prd_mmap(0x%016lx, 0x%016lx, 0x%lx, 0x%lx)\n", 1100d7cd855SJeremy Kerr vma->vm_start, vma->vm_end, vma->vm_pgoff, 1110d7cd855SJeremy Kerr vma->vm_flags); 1120d7cd855SJeremy Kerr 1130d7cd855SJeremy Kerr addr = vma->vm_pgoff << PAGE_SHIFT; 1140d7cd855SJeremy Kerr size = vma->vm_end - vma->vm_start; 1150d7cd855SJeremy Kerr 1160d7cd855SJeremy Kerr /* ensure we're mapping within one of the allowable ranges */ 1170d7cd855SJeremy Kerr if (!opal_prd_range_is_valid(addr, size)) 1180d7cd855SJeremy Kerr return -EINVAL; 1190d7cd855SJeremy Kerr 120d8ea782bSVaidyanathan Srinivasan page_prot = phys_mem_access_prot(file, vma->vm_pgoff, 121d8ea782bSVaidyanathan Srinivasan size, vma->vm_page_prot); 1220d7cd855SJeremy Kerr 123*69931cc3Sdingsenjie return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, size, 124d8ea782bSVaidyanathan Srinivasan page_prot); 1250d7cd855SJeremy Kerr } 1260d7cd855SJeremy Kerr 1270d7cd855SJeremy Kerr static bool opal_msg_queue_empty(void) 1280d7cd855SJeremy Kerr { 1290d7cd855SJeremy Kerr unsigned long flags; 1300d7cd855SJeremy Kerr bool ret; 1310d7cd855SJeremy Kerr 1320d7cd855SJeremy Kerr spin_lock_irqsave(&opal_prd_msg_queue_lock, flags); 1330d7cd855SJeremy Kerr ret = list_empty(&opal_prd_msg_queue); 1340d7cd855SJeremy Kerr spin_unlock_irqrestore(&opal_prd_msg_queue_lock, flags); 1350d7cd855SJeremy Kerr 1360d7cd855SJeremy Kerr return ret; 1370d7cd855SJeremy Kerr } 1380d7cd855SJeremy Kerr 1398153a5eaSAl Viro static __poll_t opal_prd_poll(struct file *file, 1400d7cd855SJeremy Kerr struct poll_table_struct *wait) 1410d7cd855SJeremy Kerr { 1420d7cd855SJeremy Kerr poll_wait(file, &opal_prd_msg_wait, wait); 1430d7cd855SJeremy Kerr 1440d7cd855SJeremy Kerr if (!opal_msg_queue_empty()) 145a9a08845SLinus Torvalds return EPOLLIN | EPOLLRDNORM; 1460d7cd855SJeremy Kerr 1470d7cd855SJeremy Kerr return 0; 1480d7cd855SJeremy Kerr } 1490d7cd855SJeremy Kerr 1500d7cd855SJeremy Kerr static ssize_t opal_prd_read(struct file *file, char __user *buf, 1510d7cd855SJeremy Kerr size_t count, loff_t *ppos) 1520d7cd855SJeremy Kerr { 1530d7cd855SJeremy Kerr struct opal_prd_msg_queue_item *item; 1540d7cd855SJeremy Kerr unsigned long flags; 1550d7cd855SJeremy Kerr ssize_t size, err; 1560d7cd855SJeremy Kerr int rc; 1570d7cd855SJeremy Kerr 1580d7cd855SJeremy Kerr /* we need at least a header's worth of data */ 1590d7cd855SJeremy Kerr if (count < sizeof(item->msg)) 1600d7cd855SJeremy Kerr return -EINVAL; 1610d7cd855SJeremy Kerr 1620d7cd855SJeremy Kerr if (*ppos) 1630d7cd855SJeremy Kerr return -ESPIPE; 1640d7cd855SJeremy Kerr 1650d7cd855SJeremy Kerr item = NULL; 1660d7cd855SJeremy Kerr 1670d7cd855SJeremy Kerr for (;;) { 1680d7cd855SJeremy Kerr 1690d7cd855SJeremy Kerr spin_lock_irqsave(&opal_prd_msg_queue_lock, flags); 1700d7cd855SJeremy Kerr if (!list_empty(&opal_prd_msg_queue)) { 1710d7cd855SJeremy Kerr item = list_first_entry(&opal_prd_msg_queue, 1720d7cd855SJeremy Kerr struct opal_prd_msg_queue_item, list); 1730d7cd855SJeremy Kerr list_del(&item->list); 1740d7cd855SJeremy Kerr } 1750d7cd855SJeremy Kerr spin_unlock_irqrestore(&opal_prd_msg_queue_lock, flags); 1760d7cd855SJeremy Kerr 1770d7cd855SJeremy Kerr if (item) 1780d7cd855SJeremy Kerr break; 1790d7cd855SJeremy Kerr 1800d7cd855SJeremy Kerr if (file->f_flags & O_NONBLOCK) 1810d7cd855SJeremy Kerr return -EAGAIN; 1820d7cd855SJeremy Kerr 1830d7cd855SJeremy Kerr rc = wait_event_interruptible(opal_prd_msg_wait, 1840d7cd855SJeremy Kerr !opal_msg_queue_empty()); 1850d7cd855SJeremy Kerr if (rc) 1860d7cd855SJeremy Kerr return -EINTR; 1870d7cd855SJeremy Kerr } 1880d7cd855SJeremy Kerr 1890d7cd855SJeremy Kerr size = be16_to_cpu(item->msg.size); 1900d7cd855SJeremy Kerr if (size > count) { 1910d7cd855SJeremy Kerr err = -EINVAL; 1920d7cd855SJeremy Kerr goto err_requeue; 1930d7cd855SJeremy Kerr } 1940d7cd855SJeremy Kerr 1950d7cd855SJeremy Kerr rc = copy_to_user(buf, &item->msg, size); 1960d7cd855SJeremy Kerr if (rc) { 1970d7cd855SJeremy Kerr err = -EFAULT; 1980d7cd855SJeremy Kerr goto err_requeue; 1990d7cd855SJeremy Kerr } 2000d7cd855SJeremy Kerr 2010d7cd855SJeremy Kerr kfree(item); 2020d7cd855SJeremy Kerr 2030d7cd855SJeremy Kerr return size; 2040d7cd855SJeremy Kerr 2050d7cd855SJeremy Kerr err_requeue: 2060d7cd855SJeremy Kerr /* eep! re-queue at the head of the list */ 2070d7cd855SJeremy Kerr spin_lock_irqsave(&opal_prd_msg_queue_lock, flags); 2080d7cd855SJeremy Kerr list_add(&item->list, &opal_prd_msg_queue); 2090d7cd855SJeremy Kerr spin_unlock_irqrestore(&opal_prd_msg_queue_lock, flags); 2100d7cd855SJeremy Kerr return err; 2110d7cd855SJeremy Kerr } 2120d7cd855SJeremy Kerr 2130d7cd855SJeremy Kerr static ssize_t opal_prd_write(struct file *file, const char __user *buf, 2140d7cd855SJeremy Kerr size_t count, loff_t *ppos) 2150d7cd855SJeremy Kerr { 2160d7cd855SJeremy Kerr struct opal_prd_msg_header hdr; 2170d7cd855SJeremy Kerr ssize_t size; 2180d7cd855SJeremy Kerr void *msg; 2190d7cd855SJeremy Kerr int rc; 2200d7cd855SJeremy Kerr 2210d7cd855SJeremy Kerr size = sizeof(hdr); 2220d7cd855SJeremy Kerr 2230d7cd855SJeremy Kerr if (count < size) 2240d7cd855SJeremy Kerr return -EINVAL; 2250d7cd855SJeremy Kerr 2260d7cd855SJeremy Kerr /* grab the header */ 2270d7cd855SJeremy Kerr rc = copy_from_user(&hdr, buf, sizeof(hdr)); 2280d7cd855SJeremy Kerr if (rc) 2290d7cd855SJeremy Kerr return -EFAULT; 2300d7cd855SJeremy Kerr 2310d7cd855SJeremy Kerr size = be16_to_cpu(hdr.size); 2320d7cd855SJeremy Kerr 2335588b29aSGeliang Tang msg = memdup_user(buf, size); 2345588b29aSGeliang Tang if (IS_ERR(msg)) 2355588b29aSGeliang Tang return PTR_ERR(msg); 2360d7cd855SJeremy Kerr 2370d7cd855SJeremy Kerr rc = opal_prd_msg(msg); 2380d7cd855SJeremy Kerr if (rc) { 2390d7cd855SJeremy Kerr pr_warn("write: opal_prd_msg returned %d\n", rc); 2400d7cd855SJeremy Kerr size = -EIO; 2410d7cd855SJeremy Kerr } 2420d7cd855SJeremy Kerr 2430d7cd855SJeremy Kerr kfree(msg); 2440d7cd855SJeremy Kerr 2450d7cd855SJeremy Kerr return size; 2460d7cd855SJeremy Kerr } 2470d7cd855SJeremy Kerr 2480d7cd855SJeremy Kerr static int opal_prd_release(struct inode *inode, struct file *file) 2490d7cd855SJeremy Kerr { 2500d7cd855SJeremy Kerr struct opal_prd_msg_header msg; 2510d7cd855SJeremy Kerr 2520d7cd855SJeremy Kerr msg.size = cpu_to_be16(sizeof(msg)); 2530d7cd855SJeremy Kerr msg.type = OPAL_PRD_MSG_TYPE_FINI; 2540d7cd855SJeremy Kerr 2550d7cd855SJeremy Kerr opal_prd_msg((struct opal_prd_msg *)&msg); 2560d7cd855SJeremy Kerr 2570d7cd855SJeremy Kerr atomic_xchg(&prd_usage, 0); 2580d7cd855SJeremy Kerr 2590d7cd855SJeremy Kerr return 0; 2600d7cd855SJeremy Kerr } 2610d7cd855SJeremy Kerr 2620d7cd855SJeremy Kerr static long opal_prd_ioctl(struct file *file, unsigned int cmd, 2630d7cd855SJeremy Kerr unsigned long param) 2640d7cd855SJeremy Kerr { 2650d7cd855SJeremy Kerr struct opal_prd_info info; 2660d7cd855SJeremy Kerr struct opal_prd_scom scom; 2670d7cd855SJeremy Kerr int rc = 0; 2680d7cd855SJeremy Kerr 2690d7cd855SJeremy Kerr switch (cmd) { 2700d7cd855SJeremy Kerr case OPAL_PRD_GET_INFO: 2710d7cd855SJeremy Kerr memset(&info, 0, sizeof(info)); 2720d7cd855SJeremy Kerr info.version = OPAL_PRD_KERNEL_VERSION; 2730d7cd855SJeremy Kerr rc = copy_to_user((void __user *)param, &info, sizeof(info)); 2740d7cd855SJeremy Kerr if (rc) 2750d7cd855SJeremy Kerr return -EFAULT; 2760d7cd855SJeremy Kerr break; 2770d7cd855SJeremy Kerr 2780d7cd855SJeremy Kerr case OPAL_PRD_SCOM_READ: 2790d7cd855SJeremy Kerr rc = copy_from_user(&scom, (void __user *)param, sizeof(scom)); 2800d7cd855SJeremy Kerr if (rc) 2810d7cd855SJeremy Kerr return -EFAULT; 2820d7cd855SJeremy Kerr 2830d7cd855SJeremy Kerr scom.rc = opal_xscom_read(scom.chip, scom.addr, 2840d7cd855SJeremy Kerr (__be64 *)&scom.data); 2850d7cd855SJeremy Kerr scom.data = be64_to_cpu(scom.data); 2860d7cd855SJeremy Kerr pr_devel("ioctl SCOM_READ: chip %llx addr %016llx data %016llx rc %lld\n", 2870d7cd855SJeremy Kerr scom.chip, scom.addr, scom.data, scom.rc); 2880d7cd855SJeremy Kerr 2890d7cd855SJeremy Kerr rc = copy_to_user((void __user *)param, &scom, sizeof(scom)); 2900d7cd855SJeremy Kerr if (rc) 2910d7cd855SJeremy Kerr return -EFAULT; 2920d7cd855SJeremy Kerr break; 2930d7cd855SJeremy Kerr 2940d7cd855SJeremy Kerr case OPAL_PRD_SCOM_WRITE: 2950d7cd855SJeremy Kerr rc = copy_from_user(&scom, (void __user *)param, sizeof(scom)); 2960d7cd855SJeremy Kerr if (rc) 2970d7cd855SJeremy Kerr return -EFAULT; 2980d7cd855SJeremy Kerr 2990d7cd855SJeremy Kerr scom.rc = opal_xscom_write(scom.chip, scom.addr, scom.data); 3000d7cd855SJeremy Kerr pr_devel("ioctl SCOM_WRITE: chip %llx addr %016llx data %016llx rc %lld\n", 3010d7cd855SJeremy Kerr scom.chip, scom.addr, scom.data, scom.rc); 3020d7cd855SJeremy Kerr 3030d7cd855SJeremy Kerr rc = copy_to_user((void __user *)param, &scom, sizeof(scom)); 3040d7cd855SJeremy Kerr if (rc) 3050d7cd855SJeremy Kerr return -EFAULT; 3060d7cd855SJeremy Kerr break; 3070d7cd855SJeremy Kerr 3080d7cd855SJeremy Kerr default: 3090d7cd855SJeremy Kerr rc = -EINVAL; 3100d7cd855SJeremy Kerr } 3110d7cd855SJeremy Kerr 3120d7cd855SJeremy Kerr return rc; 3130d7cd855SJeremy Kerr } 3140d7cd855SJeremy Kerr 3150d7cd855SJeremy Kerr static const struct file_operations opal_prd_fops = { 3160d7cd855SJeremy Kerr .open = opal_prd_open, 3170d7cd855SJeremy Kerr .mmap = opal_prd_mmap, 3180d7cd855SJeremy Kerr .poll = opal_prd_poll, 3190d7cd855SJeremy Kerr .read = opal_prd_read, 3200d7cd855SJeremy Kerr .write = opal_prd_write, 3210d7cd855SJeremy Kerr .unlocked_ioctl = opal_prd_ioctl, 3220d7cd855SJeremy Kerr .release = opal_prd_release, 3230d7cd855SJeremy Kerr .owner = THIS_MODULE, 3240d7cd855SJeremy Kerr }; 3250d7cd855SJeremy Kerr 3260d7cd855SJeremy Kerr static struct miscdevice opal_prd_dev = { 3270d7cd855SJeremy Kerr .minor = MISC_DYNAMIC_MINOR, 3280d7cd855SJeremy Kerr .name = "opal-prd", 3290d7cd855SJeremy Kerr .fops = &opal_prd_fops, 3300d7cd855SJeremy Kerr }; 3310d7cd855SJeremy Kerr 3320d7cd855SJeremy Kerr /* opal interface */ 3330d7cd855SJeremy Kerr static int opal_prd_msg_notifier(struct notifier_block *nb, 3340d7cd855SJeremy Kerr unsigned long msg_type, void *_msg) 3350d7cd855SJeremy Kerr { 3360d7cd855SJeremy Kerr struct opal_prd_msg_queue_item *item; 3370d7cd855SJeremy Kerr struct opal_prd_msg_header *hdr; 3380d7cd855SJeremy Kerr struct opal_msg *msg = _msg; 3397185795aSJeremy Kerr int msg_size, item_size; 3400d7cd855SJeremy Kerr unsigned long flags; 3410d7cd855SJeremy Kerr 342587164cdSVasant Hegde if (msg_type != OPAL_MSG_PRD && msg_type != OPAL_MSG_PRD2) 3430d7cd855SJeremy Kerr return 0; 3440d7cd855SJeremy Kerr 3457185795aSJeremy Kerr /* Calculate total size of the message and item we need to store. The 3467185795aSJeremy Kerr * 'size' field in the header includes the header itself. */ 3470d7cd855SJeremy Kerr hdr = (void *)msg->params; 3487185795aSJeremy Kerr msg_size = be16_to_cpu(hdr->size); 3497185795aSJeremy Kerr item_size = msg_size + sizeof(*item) - sizeof(item->msg); 3500d7cd855SJeremy Kerr 3517185795aSJeremy Kerr item = kzalloc(item_size, GFP_ATOMIC); 3520d7cd855SJeremy Kerr if (!item) 3530d7cd855SJeremy Kerr return -ENOMEM; 3540d7cd855SJeremy Kerr 3557185795aSJeremy Kerr memcpy(&item->msg, msg->params, msg_size); 3560d7cd855SJeremy Kerr 3570d7cd855SJeremy Kerr spin_lock_irqsave(&opal_prd_msg_queue_lock, flags); 3580d7cd855SJeremy Kerr list_add_tail(&item->list, &opal_prd_msg_queue); 3590d7cd855SJeremy Kerr spin_unlock_irqrestore(&opal_prd_msg_queue_lock, flags); 3600d7cd855SJeremy Kerr 3610d7cd855SJeremy Kerr wake_up_interruptible(&opal_prd_msg_wait); 3620d7cd855SJeremy Kerr 3630d7cd855SJeremy Kerr return 0; 3640d7cd855SJeremy Kerr } 3650d7cd855SJeremy Kerr 3660d7cd855SJeremy Kerr static struct notifier_block opal_prd_event_nb = { 3670d7cd855SJeremy Kerr .notifier_call = opal_prd_msg_notifier, 3680d7cd855SJeremy Kerr .next = NULL, 3690d7cd855SJeremy Kerr .priority = 0, 3700d7cd855SJeremy Kerr }; 3710d7cd855SJeremy Kerr 3720d7cd855SJeremy Kerr static int opal_prd_probe(struct platform_device *pdev) 3730d7cd855SJeremy Kerr { 3740d7cd855SJeremy Kerr int rc; 3750d7cd855SJeremy Kerr 3760d7cd855SJeremy Kerr if (!pdev || !pdev->dev.of_node) 3770d7cd855SJeremy Kerr return -ENODEV; 3780d7cd855SJeremy Kerr 3790d7cd855SJeremy Kerr /* We should only have one prd driver instance per machine; ensure 3800d7cd855SJeremy Kerr * that we only get a valid probe on a single OF node. 3810d7cd855SJeremy Kerr */ 3820d7cd855SJeremy Kerr if (prd_node) 3830d7cd855SJeremy Kerr return -EBUSY; 3840d7cd855SJeremy Kerr 3850d7cd855SJeremy Kerr prd_node = pdev->dev.of_node; 3860d7cd855SJeremy Kerr 3870d7cd855SJeremy Kerr rc = opal_message_notifier_register(OPAL_MSG_PRD, &opal_prd_event_nb); 3880d7cd855SJeremy Kerr if (rc) { 3890d7cd855SJeremy Kerr pr_err("Couldn't register event notifier\n"); 3900d7cd855SJeremy Kerr return rc; 3910d7cd855SJeremy Kerr } 3920d7cd855SJeremy Kerr 393587164cdSVasant Hegde rc = opal_message_notifier_register(OPAL_MSG_PRD2, &opal_prd_event_nb); 394587164cdSVasant Hegde if (rc) { 395587164cdSVasant Hegde pr_err("Couldn't register PRD2 event notifier\n"); 396587164cdSVasant Hegde return rc; 397587164cdSVasant Hegde } 398587164cdSVasant Hegde 3990d7cd855SJeremy Kerr rc = misc_register(&opal_prd_dev); 4000d7cd855SJeremy Kerr if (rc) { 4010d7cd855SJeremy Kerr pr_err("failed to register miscdev\n"); 4020d7cd855SJeremy Kerr opal_message_notifier_unregister(OPAL_MSG_PRD, 4030d7cd855SJeremy Kerr &opal_prd_event_nb); 4040d7cd855SJeremy Kerr return rc; 4050d7cd855SJeremy Kerr } 4060d7cd855SJeremy Kerr 4070d7cd855SJeremy Kerr return 0; 4080d7cd855SJeremy Kerr } 4090d7cd855SJeremy Kerr 4100d7cd855SJeremy Kerr static int opal_prd_remove(struct platform_device *pdev) 4110d7cd855SJeremy Kerr { 4120d7cd855SJeremy Kerr misc_deregister(&opal_prd_dev); 4130d7cd855SJeremy Kerr opal_message_notifier_unregister(OPAL_MSG_PRD, &opal_prd_event_nb); 4140d7cd855SJeremy Kerr return 0; 4150d7cd855SJeremy Kerr } 4160d7cd855SJeremy Kerr 4170d7cd855SJeremy Kerr static const struct of_device_id opal_prd_match[] = { 4180d7cd855SJeremy Kerr { .compatible = "ibm,opal-prd" }, 4190d7cd855SJeremy Kerr { }, 4200d7cd855SJeremy Kerr }; 4210d7cd855SJeremy Kerr 4220d7cd855SJeremy Kerr static struct platform_driver opal_prd_driver = { 4230d7cd855SJeremy Kerr .driver = { 4240d7cd855SJeremy Kerr .name = "opal-prd", 4250d7cd855SJeremy Kerr .of_match_table = opal_prd_match, 4260d7cd855SJeremy Kerr }, 4270d7cd855SJeremy Kerr .probe = opal_prd_probe, 4280d7cd855SJeremy Kerr .remove = opal_prd_remove, 4290d7cd855SJeremy Kerr }; 4300d7cd855SJeremy Kerr 4310d7cd855SJeremy Kerr module_platform_driver(opal_prd_driver); 4320d7cd855SJeremy Kerr 4330d7cd855SJeremy Kerr MODULE_DEVICE_TABLE(of, opal_prd_match); 4340d7cd855SJeremy Kerr MODULE_DESCRIPTION("PowerNV OPAL runtime diagnostic driver"); 4350d7cd855SJeremy Kerr MODULE_LICENSE("GPL"); 436