1a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller/* flash.c: Allow mmap access to the OBP Flash, for OBP updates. 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/types.h> 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/errno.h> 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/miscdevice.h> 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/fcntl.h> 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/poll.h> 12a3108ca2323dec0f6321c3f7706cdaed51f694eaArnd Bergmann#include <linux/mutex.h> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/spinlock.h> 148a73709ecc6a972c94e6ff9c0cc639f8f38b9151Horst H. von Brand#include <linux/mm.h> 15a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller#include <linux/of.h> 16a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller#include <linux/of_device.h> 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/uaccess.h> 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/pgtable.h> 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/io.h> 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/upa.h> 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 23a3108ca2323dec0f6321c3f7706cdaed51f694eaArnd Bergmannstatic DEFINE_MUTEX(flash_mutex); 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic DEFINE_SPINLOCK(flash_lock); 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct { 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long read_base; /* Physical read address */ 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long write_base; /* Physical write address */ 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long read_size; /* Size of read area */ 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long write_size; /* Size of write area */ 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long busy; /* In use? */ 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} flash; 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define FLASH_MINOR 152 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsflash_mmap(struct file *file, struct vm_area_struct *vma) 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long addr; 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long size; 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&flash_lock); 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (flash.read_base == flash.write_base) { 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds addr = flash.read_base; 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = flash.read_size; 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((vma->vm_flags & VM_READ) && 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (vma->vm_flags & VM_WRITE)) { 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&flash_lock); 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (vma->vm_flags & VM_READ) { 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds addr = flash.read_base; 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = flash.read_size; 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (vma->vm_flags & VM_WRITE) { 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds addr = flash.write_base; 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = flash.write_size; 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&flash_lock); 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENXIO; 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&flash_lock); 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((vma->vm_pgoff << PAGE_SHIFT) > size) 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENXIO; 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds addr = vma->vm_pgoff + (addr >> PAGE_SHIFT); 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (vma->vm_end - (vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT)) > size) 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size = vma->vm_end - (vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT)); 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7114778d9072e53d2171f66ffd9657daff41acfaedDavid S. Miller vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (io_remap_pfn_range(vma, vma->vm_start, addr, size, vma->vm_page_prot)) 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EAGAIN; 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic long long 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsflash_llseek(struct file *file, long long offset, int origin) 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 82a3108ca2323dec0f6321c3f7706cdaed51f694eaArnd Bergmann mutex_lock(&flash_mutex); 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (origin) { 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case 0: 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds file->f_pos = offset; 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case 1: 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds file->f_pos += offset; 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (file->f_pos > flash.read_size) 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds file->f_pos = flash.read_size; 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case 2: 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds file->f_pos = flash.read_size; 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default: 96a3108ca2323dec0f6321c3f7706cdaed51f694eaArnd Bergmann mutex_unlock(&flash_mutex); 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 99a3108ca2323dec0f6321c3f7706cdaed51f694eaArnd Bergmann mutex_unlock(&flash_mutex); 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return file->f_pos; 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic ssize_t 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsflash_read(struct file * file, char __user * buf, 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t count, loff_t *ppos) 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 107be94bbb5db4de0f3a2a5405511ea3ebea261f2c8Jan Blunck loff_t p = *ppos; 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 109be94bbb5db4de0f3a2a5405511ea3ebea261f2c8Jan Blunck 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (count > flash.read_size - p) 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds count = flash.read_size - p; 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < count; i++) { 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds u8 data = upa_readb(flash.read_base + p + i); 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (put_user(data, buf)) 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EFAULT; 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds buf++; 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 120be94bbb5db4de0f3a2a5405511ea3ebea261f2c8Jan Blunck *ppos += count; 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return count; 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsflash_open(struct inode *inode, struct file *file) 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 127a3108ca2323dec0f6321c3f7706cdaed51f694eaArnd Bergmann mutex_lock(&flash_mutex); 12878abb6ac919cee123e632d833a42d0312ccb2b0dArnd Bergmann if (test_and_set_bit(0, (void *)&flash.busy) != 0) { 129a3108ca2323dec0f6321c3f7706cdaed51f694eaArnd Bergmann mutex_unlock(&flash_mutex); 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EBUSY; 13178abb6ac919cee123e632d833a42d0312ccb2b0dArnd Bergmann } 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 133a3108ca2323dec0f6321c3f7706cdaed51f694eaArnd Bergmann mutex_unlock(&flash_mutex); 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsflash_release(struct inode *inode, struct file *file) 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&flash_lock); 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flash.busy = 0; 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&flash_lock); 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14700977a59b951207d38380c75f03a36829950265cArjan van de Venstatic const struct file_operations flash_fops = { 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* no write to the Flash, use mmap 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * and play flash dependent tricks. 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .owner = THIS_MODULE, 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .llseek = flash_llseek, 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .read = flash_read, 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .mmap = flash_mmap, 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .open = flash_open, 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .release = flash_release, 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct miscdevice flash_dev = { FLASH_MINOR, "flash", &flash_fops }; 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 161082a2004db27e16ee9a5b1234e6ab219ea29d693Greg Kroah-Hartmanstatic int flash_probe(struct platform_device *op) 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 16361c7a080a5a061c976988fd4b844dfb468dda255Grant Likely struct device_node *dp = op->dev.of_node; 164a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller struct device_node *parent; 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 166a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller parent = dp->parent; 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 168a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller if (strcmp(parent->name, "sbus") && 169a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller strcmp(parent->name, "sbi") && 170a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller strcmp(parent->name, "ebus")) 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENODEV; 172a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller 173a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller flash.read_base = op->resource[0].start; 174a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller flash.read_size = resource_size(&op->resource[0]); 175a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller if (op->resource[1].flags) { 176a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller flash.write_base = op->resource[1].start; 177a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller flash.write_size = resource_size(&op->resource[1]); 178a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller } else { 179a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller flash.write_base = op->resource[0].start; 180a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller flash.write_size = resource_size(&op->resource[0]); 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 182a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller flash.busy = 0; 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 184a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller printk(KERN_INFO "%s: OBP Flash, RD %lx[%lx] WR %lx[%lx]\n", 18561c7a080a5a061c976988fd4b844dfb468dda255Grant Likely op->dev.of_node->full_name, 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flash.read_base, flash.read_size, 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flash.write_base, flash.write_size); 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 189a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller return misc_register(&flash_dev); 190a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller} 191a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller 192082a2004db27e16ee9a5b1234e6ab219ea29d693Greg Kroah-Hartmanstatic int flash_remove(struct platform_device *op) 193a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller{ 194a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller misc_deregister(&flash_dev); 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 199fd098316ef533e8441576f020ead4beab93154ceDavid S. Millerstatic const struct of_device_id flash_match[] = { 200a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller { 201a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller .name = "flashprom", 202a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller }, 203a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller {}, 204a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller}; 205a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. MillerMODULE_DEVICE_TABLE(of, flash_match); 206a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller 2074ebb24f707187196937607c60810d42f7112d7aaGrant Likelystatic struct platform_driver flash_driver = { 2084018294b53d1dae026880e45f174c1cc63b5d435Grant Likely .driver = { 2094018294b53d1dae026880e45f174c1cc63b5d435Grant Likely .name = "flash", 2104018294b53d1dae026880e45f174c1cc63b5d435Grant Likely .owner = THIS_MODULE, 2114018294b53d1dae026880e45f174c1cc63b5d435Grant Likely .of_match_table = flash_match, 2124018294b53d1dae026880e45f174c1cc63b5d435Grant Likely }, 213a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller .probe = flash_probe, 214082a2004db27e16ee9a5b1234e6ab219ea29d693Greg Kroah-Hartman .remove = flash_remove, 215a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller}; 216a9540d34229c0ec1fceb9a9d1e41ea45d016044dDavid S. Miller 217dbf2b92d54e73e4a2524b90d29bd498ecc4aa593Axel Linmodule_platform_driver(flash_driver); 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 220