X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fmtd%2Fmtdchar.c;h=3013d0883b97212eb4ff1ea80c655872ec8cef75;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=510ad78312cc67155a22813b8c893c8ad4011004;hpb=f7f1b0f1e2fbadeab12d24236000e778aa9b1ead;p=linux-2.6.git diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 510ad7831..3013d0883 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -1,41 +1,46 @@ /* - * $Id: mtdchar.c,v 1.66 2005/01/05 18:05:11 dwmw2 Exp $ + * $Id: mtdchar.c,v 1.76 2005/11/07 11:14:20 gleixner Exp $ * * Character-device access to raw MTD devices. * */ -#include +#include +#include +#include +#include #include #include +#include +#include + #include #include -#include -#include -#include + #include -#ifdef CONFIG_DEVFS_FS -#include +static struct class *mtd_class; static void mtd_notify_add(struct mtd_info* mtd) { if (!mtd) return; - devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2), - S_IFCHR | S_IRUGO | S_IWUGO, "mtd/%d", mtd->index); - - devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), - S_IFCHR | S_IRUGO, "mtd/%dro", mtd->index); + class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2), + NULL, "mtd%d", mtd->index); + + class_device_create(mtd_class, NULL, + MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), + NULL, "mtd%dro", mtd->index); } static void mtd_notify_remove(struct mtd_info* mtd) { if (!mtd) return; - devfs_remove("mtd/%d", mtd->index); - devfs_remove("mtd/%dro", mtd->index); + + class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2)); + class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1)); } static struct mtd_notifier notifier = { @@ -43,49 +48,37 @@ static struct mtd_notifier notifier = { .remove = mtd_notify_remove, }; -static inline void mtdchar_devfs_init(void) -{ - devfs_mk_dir("mtd"); - register_mtd_user(¬ifier); -} - -static inline void mtdchar_devfs_exit(void) -{ - unregister_mtd_user(¬ifier); - devfs_remove("mtd"); -} -#else /* !DEVFS */ -#define mtdchar_devfs_init() do { } while(0) -#define mtdchar_devfs_exit() do { } while(0) -#endif +/* + * Data structure to hold the pointer to the mtd device as well + * as mode information ofr various use cases. + */ +struct mtd_file_info { + struct mtd_info *mtd; + enum mtd_file_modes mode; +}; static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) { - struct mtd_info *mtd = file->private_data; + struct mtd_file_info *mfi = file->private_data; + struct mtd_info *mtd = mfi->mtd; switch (orig) { - case 0: - /* SEEK_SET */ - file->f_pos = offset; + case SEEK_SET: break; - case 1: - /* SEEK_CUR */ - file->f_pos += offset; + case SEEK_CUR: + offset += file->f_pos; break; - case 2: - /* SEEK_END */ - file->f_pos =mtd->size + offset; + case SEEK_END: + offset += mtd->size; break; default: return -EINVAL; } - if (file->f_pos < 0) - file->f_pos = 0; - else if (file->f_pos >= mtd->size) - file->f_pos = mtd->size - 1; + if (offset >= 0 && offset <= mtd->size) + return file->f_pos = offset; - return file->f_pos; + return -EINVAL; } @@ -95,6 +88,7 @@ static int mtd_open(struct inode *inode, struct file *file) int minor = iminor(inode); int devnum = minor >> 1; struct mtd_info *mtd; + struct mtd_file_info *mfi; DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); @@ -106,23 +100,29 @@ static int mtd_open(struct inode *inode, struct file *file) return -EACCES; mtd = get_mtd_device(NULL, devnum); - - if (!mtd) - return -ENODEV; - + + if (IS_ERR(mtd)) + return PTR_ERR(mtd); + if (MTD_ABSENT == mtd->type) { put_mtd_device(mtd); return -ENODEV; } - file->private_data = mtd; - /* You can't open it RW if it's not a writeable device */ if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) { put_mtd_device(mtd); return -EACCES; } - + + mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); + if (!mfi) { + put_mtd_device(mtd); + return -ENOMEM; + } + mfi->mtd = mtd; + file->private_data = mfi; + return 0; } /* mtd_open */ @@ -130,16 +130,17 @@ static int mtd_open(struct inode *inode, struct file *file) static int mtd_close(struct inode *inode, struct file *file) { - struct mtd_info *mtd; + struct mtd_file_info *mfi = file->private_data; + struct mtd_info *mtd = mfi->mtd; DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); - mtd = file->private_data; - if (mtd->sync) mtd->sync(mtd); - + put_mtd_device(mtd); + file->private_data = NULL; + kfree(mfi); return 0; } /* mtd_close */ @@ -151,13 +152,14 @@ static int mtd_close(struct inode *inode, struct file *file) static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) { - struct mtd_info *mtd = file->private_data; + struct mtd_file_info *mfi = file->private_data; + struct mtd_info *mtd = mfi->mtd; size_t retlen=0; size_t total_retlen=0; int ret=0; int len; char *kbuf; - + DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); if (*ppos + count > mtd->size) @@ -165,30 +167,61 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t if (!count) return 0; - + /* FIXME: Use kiovec in 2.5 to lock down the user's buffers and pass them directly to the MTD functions */ + + if (count > MAX_KMALLOC_SIZE) + kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); + else + kbuf=kmalloc(count, GFP_KERNEL); + + if (!kbuf) + return -ENOMEM; + while (count) { - if (count > MAX_KMALLOC_SIZE) + + if (count > MAX_KMALLOC_SIZE) len = MAX_KMALLOC_SIZE; else len = count; - kbuf=kmalloc(len,GFP_KERNEL); - if (!kbuf) - return -ENOMEM; - - ret = MTD_READ(mtd, *ppos, len, &retlen, kbuf); + switch (mfi->mode) { + case MTD_MODE_OTP_FACTORY: + ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); + break; + case MTD_MODE_OTP_USER: + ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); + break; + case MTD_MODE_RAW: + { + struct mtd_oob_ops ops; + + ops.mode = MTD_OOB_RAW; + ops.datbuf = kbuf; + ops.oobbuf = NULL; + ops.len = len; + + ret = mtd->read_oob(mtd, *ppos, &ops); + retlen = ops.retlen; + break; + } + default: + ret = mtd->read(mtd, *ppos, len, &retlen, kbuf); + } /* Nand returns -EBADMSG on ecc errors, but it returns * the data. For our userspace tools it is important - * to dump areas with ecc errors ! + * to dump areas with ecc errors ! + * For kernel internal usage it also might return -EUCLEAN + * to signal the caller that a bitflip has occured and has + * been corrected by the ECC algorithm. * Userspace software which accesses NAND this way * must be aware of the fact that it deals with NAND */ - if (!ret || (ret == -EBADMSG)) { + if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) { *ppos += retlen; if (copy_to_user(buf, kbuf, retlen)) { - kfree(kbuf); + kfree(kbuf); return -EFAULT; } else @@ -196,21 +229,24 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t count -= retlen; buf += retlen; + if (retlen == 0) + count = 0; } else { kfree(kbuf); return ret; } - - kfree(kbuf); + } + kfree(kbuf); return total_retlen; } /* mtd_read */ static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) { - struct mtd_info *mtd = file->private_data; + struct mtd_file_info *mfi = file->private_data; + struct mtd_info *mtd = mfi->mtd; char *kbuf; size_t retlen; size_t total_retlen=0; @@ -218,34 +254,65 @@ static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count int len; DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); - + if (*ppos == mtd->size) return -ENOSPC; - + if (*ppos + count > mtd->size) count = mtd->size - *ppos; if (!count) return 0; + if (count > MAX_KMALLOC_SIZE) + kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); + else + kbuf=kmalloc(count, GFP_KERNEL); + + if (!kbuf) + return -ENOMEM; + while (count) { - if (count > MAX_KMALLOC_SIZE) + + if (count > MAX_KMALLOC_SIZE) len = MAX_KMALLOC_SIZE; else len = count; - kbuf=kmalloc(len,GFP_KERNEL); - if (!kbuf) { - printk("kmalloc is null\n"); - return -ENOMEM; - } - if (copy_from_user(kbuf, buf, len)) { kfree(kbuf); return -EFAULT; } - - ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); + + switch (mfi->mode) { + case MTD_MODE_OTP_FACTORY: + ret = -EROFS; + break; + case MTD_MODE_OTP_USER: + if (!mtd->write_user_prot_reg) { + ret = -EOPNOTSUPP; + break; + } + ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); + break; + + case MTD_MODE_RAW: + { + struct mtd_oob_ops ops; + + ops.mode = MTD_OOB_RAW; + ops.datbuf = kbuf; + ops.oobbuf = NULL; + ops.len = len; + + ret = mtd->write_oob(mtd, *ppos, &ops); + retlen = ops.retlen; + break; + } + + default: + ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); + } if (!ret) { *ppos += retlen; total_retlen += retlen; @@ -256,10 +323,9 @@ static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count kfree(kbuf); return ret; } - - kfree(kbuf); } + kfree(kbuf); return total_retlen; } /* mtd_write */ @@ -273,14 +339,46 @@ static void mtdchar_erase_callback (struct erase_info *instr) wake_up((wait_queue_head_t *)instr->priv); } +#if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) +static int otp_select_filemode(struct mtd_file_info *mfi, int mode) +{ + struct mtd_info *mtd = mfi->mtd; + int ret = 0; + + switch (mode) { + case MTD_OTP_FACTORY: + if (!mtd->read_fact_prot_reg) + ret = -EOPNOTSUPP; + else + mfi->mode = MTD_MODE_OTP_FACTORY; + break; + case MTD_OTP_USER: + if (!mtd->read_fact_prot_reg) + ret = -EOPNOTSUPP; + else + mfi->mode = MTD_MODE_OTP_USER; + break; + default: + ret = -EINVAL; + case MTD_OTP_OFF: + break; + } + return ret; +} +#else +# define otp_select_filemode(f,m) -EOPNOTSUPP +#endif + static int mtd_ioctl(struct inode *inode, struct file *file, u_int cmd, u_long arg) { - struct mtd_info *mtd = file->private_data; + struct mtd_file_info *mfi = file->private_data; + struct mtd_info *mtd = mfi->mtd; void __user *argp = (void __user *)arg; int ret = 0; u_long size; - + struct mtd_info_user info; + DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; @@ -292,7 +390,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file, if (!access_ok(VERIFY_WRITE, argp, size)) return -EFAULT; } - + switch (cmd) { case MEMGETREGIONCOUNT: if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) @@ -315,7 +413,15 @@ static int mtd_ioctl(struct inode *inode, struct file *file, } case MEMGETINFO: - if (copy_to_user(argp, mtd, sizeof(struct mtd_info_user))) + info.type = mtd->type; + info.flags = mtd->flags; + info.size = mtd->size; + info.erasesize = mtd->erasesize; + info.writesize = mtd->writesize; + info.oobsize = mtd->oobsize; + info.ecctype = mtd->ecctype; + info.eccsize = mtd->eccsize; + if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) return -EFAULT; break; @@ -326,7 +432,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file, if(!(file->f_mode & 2)) return -EPERM; - erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL); + erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); if (!erase) ret = -ENOMEM; else { @@ -335,7 +441,6 @@ static int mtd_ioctl(struct inode *inode, struct file *file, init_waitqueue_head(&waitq); - memset (erase,0,sizeof(struct erase_info)); if (copy_from_user(&erase->addr, argp, sizeof(struct erase_info_user))) { kfree(erase); @@ -344,11 +449,11 @@ static int mtd_ioctl(struct inode *inode, struct file *file, erase->mtd = mtd; erase->callback = mtdchar_erase_callback; erase->priv = (unsigned long)&waitq; - + /* FIXME: Allow INTERRUPTIBLE. Which means not having the wait_queue head on the stack. - + If the wq_head is on the stack, and we leave because we got interrupted, then the wq_head is no longer there when the @@ -374,16 +479,15 @@ static int mtd_ioctl(struct inode *inode, struct file *file, case MEMWRITEOOB: { struct mtd_oob_buf buf; - void *databuf; - ssize_t retlen; - + struct mtd_oob_ops ops; + if(!(file->f_mode & 2)) return -EPERM; if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) return -EFAULT; - - if (buf.length > 0x4096) + + if (buf.length > 4096) return -EINVAL; if (!mtd->write_oob) @@ -395,21 +499,31 @@ static int mtd_ioctl(struct inode *inode, struct file *file, if (ret) return ret; - databuf = kmalloc(buf.length, GFP_KERNEL); - if (!databuf) + ops.ooblen = buf.length; + ops.ooboffs = buf.start & (mtd->oobsize - 1); + ops.datbuf = NULL; + ops.mode = MTD_OOB_PLACE; + + if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) + return -EINVAL; + + ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); + if (!ops.oobbuf) return -ENOMEM; - - if (copy_from_user(databuf, buf.ptr, buf.length)) { - kfree(databuf); + + if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) { + kfree(ops.oobbuf); return -EFAULT; } - ret = (mtd->write_oob)(mtd, buf.start, buf.length, &retlen, databuf); + buf.start &= ~(mtd->oobsize - 1); + ret = mtd->write_oob(mtd, buf.start, &ops); - if (copy_to_user(argp + sizeof(uint32_t), &retlen, sizeof(uint32_t))) + if (copy_to_user(argp + sizeof(uint32_t), &ops.oobretlen, + sizeof(uint32_t))) ret = -EFAULT; - kfree(databuf); + kfree(ops.oobbuf); break; } @@ -417,13 +531,12 @@ static int mtd_ioctl(struct inode *inode, struct file *file, case MEMREADOOB: { struct mtd_oob_buf buf; - void *databuf; - ssize_t retlen; + struct mtd_oob_ops ops; if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) return -EFAULT; - - if (buf.length > 0x4096) + + if (buf.length > 4096) return -EINVAL; if (!mtd->read_oob) @@ -431,22 +544,31 @@ static int mtd_ioctl(struct inode *inode, struct file *file, else ret = access_ok(VERIFY_WRITE, buf.ptr, buf.length) ? 0 : -EFAULT; - if (ret) return ret; - databuf = kmalloc(buf.length, GFP_KERNEL); - if (!databuf) + ops.ooblen = buf.length; + ops.ooboffs = buf.start & (mtd->oobsize - 1); + ops.datbuf = NULL; + ops.mode = MTD_OOB_PLACE; + + if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs)) + return -EINVAL; + + ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); + if (!ops.oobbuf) return -ENOMEM; - - ret = (mtd->read_oob)(mtd, buf.start, buf.length, &retlen, databuf); - if (put_user(retlen, (uint32_t __user *)argp)) + buf.start &= ~(mtd->oobsize - 1); + ret = mtd->read_oob(mtd, buf.start, &ops); + + if (put_user(ops.oobretlen, (uint32_t __user *)argp)) ret = -EFAULT; - else if (retlen && copy_to_user(buf.ptr, databuf, retlen)) + else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf, + ops.oobretlen)) ret = -EFAULT; - - kfree(databuf); + + kfree(ops.oobbuf); break; } @@ -478,16 +600,23 @@ static int mtd_ioctl(struct inode *inode, struct file *file, break; } - case MEMSETOOBSEL: - { - if (copy_from_user(&mtd->oobinfo, argp, sizeof(struct nand_oobinfo))) - return -EFAULT; - break; - } - + /* Legacy interface */ case MEMGETOOBSEL: { - if (copy_to_user(argp, &(mtd->oobinfo), sizeof(struct nand_oobinfo))) + struct nand_oobinfo oi; + + if (!mtd->ecclayout) + return -EOPNOTSUPP; + if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) + return -EINVAL; + + oi.useecc = MTD_NANDECC_AUTOPLACE; + memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); + memcpy(&oi.oobfree, mtd->ecclayout->oobfree, + sizeof(oi.oobfree)); + oi.eccbytes = mtd->ecclayout->eccbytes; + + if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) return -EFAULT; break; } @@ -495,7 +624,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file, case MEMGETBADBLOCK: { loff_t offs; - + if (copy_from_user(&offs, argp, sizeof(loff_t))) return -EFAULT; if (!mtd->block_isbad) @@ -518,6 +647,111 @@ static int mtd_ioctl(struct inode *inode, struct file *file, break; } +#if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) + case OTPSELECT: + { + int mode; + if (copy_from_user(&mode, argp, sizeof(int))) + return -EFAULT; + + mfi->mode = MTD_MODE_NORMAL; + + ret = otp_select_filemode(mfi, mode); + + file->f_pos = 0; + break; + } + + case OTPGETREGIONCOUNT: + case OTPGETREGIONINFO: + { + struct otp_info *buf = kmalloc(4096, GFP_KERNEL); + if (!buf) + return -ENOMEM; + ret = -EOPNOTSUPP; + switch (mfi->mode) { + case MTD_MODE_OTP_FACTORY: + if (mtd->get_fact_prot_info) + ret = mtd->get_fact_prot_info(mtd, buf, 4096); + break; + case MTD_MODE_OTP_USER: + if (mtd->get_user_prot_info) + ret = mtd->get_user_prot_info(mtd, buf, 4096); + break; + default: + break; + } + if (ret >= 0) { + if (cmd == OTPGETREGIONCOUNT) { + int nbr = ret / sizeof(struct otp_info); + ret = copy_to_user(argp, &nbr, sizeof(int)); + } else + ret = copy_to_user(argp, buf, ret); + if (ret) + ret = -EFAULT; + } + kfree(buf); + break; + } + + case OTPLOCK: + { + struct otp_info info; + + if (mfi->mode != MTD_MODE_OTP_USER) + return -EINVAL; + if (copy_from_user(&info, argp, sizeof(info))) + return -EFAULT; + if (!mtd->lock_user_prot_reg) + return -EOPNOTSUPP; + ret = mtd->lock_user_prot_reg(mtd, info.start, info.length); + break; + } +#endif + + case ECCGETLAYOUT: + { + if (!mtd->ecclayout) + return -EOPNOTSUPP; + + if (copy_to_user(argp, mtd->ecclayout, + sizeof(struct nand_ecclayout))) + return -EFAULT; + break; + } + + case ECCGETSTATS: + { + if (copy_to_user(argp, &mtd->ecc_stats, + sizeof(struct mtd_ecc_stats))) + return -EFAULT; + break; + } + + case MTDFILEMODE: + { + mfi->mode = 0; + + switch(arg) { + case MTD_MODE_OTP_FACTORY: + case MTD_MODE_OTP_USER: + ret = otp_select_filemode(mfi, arg); + break; + + case MTD_MODE_RAW: + if (!mtd->read_oob || !mtd->write_oob) + return -EOPNOTSUPP; + mfi->mode = arg; + + case MTD_MODE_NORMAL: + break; + default: + ret = -EINVAL; + } + file->f_pos = 0; + break; + } + default: ret = -ENOTTY; } @@ -543,13 +777,22 @@ static int __init init_mtdchar(void) return -EAGAIN; } - mtdchar_devfs_init(); + mtd_class = class_create(THIS_MODULE, "mtd"); + + if (IS_ERR(mtd_class)) { + printk(KERN_ERR "Error creating mtd class.\n"); + unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); + return PTR_ERR(mtd_class); + } + + register_mtd_user(¬ifier); return 0; } static void __exit cleanup_mtdchar(void) { - mtdchar_devfs_exit(); + unregister_mtd_user(¬ifier); + class_destroy(mtd_class); unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); }