diff options
Diffstat (limited to 'drivers/sbus/char/jsflash.c')
| -rw-r--r-- | drivers/sbus/char/jsflash.c | 660 |
1 files changed, 0 insertions, 660 deletions
diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c deleted file mode 100644 index 8520587b8d09..000000000000 --- a/drivers/sbus/char/jsflash.c +++ /dev/null @@ -1,660 +0,0 @@ -/* - * drivers/sbus/char/jsflash.c - * - * Copyright (C) 1991, 1992 Linus Torvalds (drivers/char/mem.c) - * Copyright (C) 1997 Eddie C. Dost (drivers/sbus/char/flash.c) - * Copyright (C) 1997-2000 Pavel Machek <pavel@ucw.cz> (drivers/block/nbd.c) - * Copyright (C) 1999-2000 Pete Zaitcev - * - * This driver is used to program OS into a Flash SIMM on - * Krups and Espresso platforms. - * - * TODO: do not allow erase/programming if file systems are mounted. - * TODO: Erase/program both banks of a 8MB SIMM. - * - * It is anticipated that programming an OS Flash will be a routine - * procedure. In the same time it is exceedingly dangerous because - * a user can program its OBP flash with OS image and effectively - * kill the machine. - * - * This driver uses an interface different from Eddie's flash.c - * as a silly safeguard. - * - * XXX The flash.c manipulates page caching characteristics in a certain - * dubious way; also it assumes that remap_pfn_range() can remap - * PCI bus locations, which may be false. ioremap() must be used - * instead. We should discuss this. - */ - -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/miscdevice.h> -#include <linux/fcntl.h> -#include <linux/poll.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/genhd.h> -#include <linux/blkdev.h> -#include <linux/uaccess.h> -#include <asm/pgtable.h> -#include <asm/io.h> -#include <asm/pcic.h> -#include <asm/oplib.h> - -#include <asm/jsflash.h> /* ioctl arguments. <linux/> ?? */ -#define JSFIDSZ (sizeof(struct jsflash_ident_arg)) -#define JSFPRGSZ (sizeof(struct jsflash_program_arg)) - -/* - * Our device numbers have no business in system headers. - * The only thing a user knows is the device name /dev/jsflash. - * - * Block devices are laid out like this: - * minor+0 - Bootstrap, for 8MB SIMM 0x20400000[0x800000] - * minor+1 - Filesystem to mount, normally 0x20400400[0x7ffc00] - * minor+2 - Whole flash area for any case... 0x20000000[0x01000000] - * Total 3 minors per flash device. - * - * It is easier to have static size vectors, so we define - * a total minor range JSF_MAX, which must cover all minors. - */ -/* character device */ -#define JSF_MINOR 178 /* 178 is registered with hpa */ -/* block device */ -#define JSF_MAX 3 /* 3 minors wasted total so far. */ -#define JSF_NPART 3 /* 3 minors per flash device */ -#define JSF_PART_BITS 2 /* 2 bits of minors to cover JSF_NPART */ -#define JSF_PART_MASK 0x3 /* 2 bits mask */ - -static DEFINE_MUTEX(jsf_mutex); - -/* - * Access functions. - * We could ioremap(), but it's easier this way. - */ -static unsigned int jsf_inl(unsigned long addr) -{ - unsigned long retval; - - __asm__ __volatile__("lda [%1] %2, %0\n\t" : - "=r" (retval) : - "r" (addr), "i" (ASI_M_BYPASS)); - return retval; -} - -static void jsf_outl(unsigned long addr, __u32 data) -{ - - __asm__ __volatile__("sta %0, [%1] %2\n\t" : : - "r" (data), "r" (addr), "i" (ASI_M_BYPASS) : - "memory"); -} - -/* - * soft carrier - */ - -struct jsfd_part { - unsigned long dbase; - unsigned long dsize; -}; - -struct jsflash { - unsigned long base; - unsigned long size; - unsigned long busy; /* In use? */ - struct jsflash_ident_arg id; - /* int mbase; */ /* Minor base, typically zero */ - struct jsfd_part dv[JSF_NPART]; -}; - -/* - * We do not map normal memory or obio as a safety precaution. - * But offsets are real, for ease of userland programming. - */ -#define JSF_BASE_TOP 0x30000000 -#define JSF_BASE_ALL 0x20000000 - -#define JSF_BASE_JK 0x20400000 - -/* - */ -static struct gendisk *jsfd_disk[JSF_MAX]; - -/* - * Let's pretend we may have several of these... - */ -static struct jsflash jsf0; - -/* - * Wait for AMD to finish its embedded algorithm. - * We use the Toggle bit DQ6 (0x40) because it does not - * depend on the data value as /DATA bit DQ7 does. - * - * XXX Do we need any timeout here? So far it never hanged, beware broken hw. - */ -static void jsf_wait(unsigned long p) { - unsigned int x1, x2; - - for (;;) { - x1 = jsf_inl(p); - x2 = jsf_inl(p); - if ((x1 & 0x40404040) == (x2 & 0x40404040)) return; - } -} - -/* - * Programming will only work if Flash is clean, - * we leave it to the programmer application. - * - * AMD must be programmed one byte at a time; - * thus, Simple Tech SIMM must be written 4 bytes at a time. - * - * Write waits for the chip to become ready after the write - * was finished. This is done so that application would read - * consistent data after the write is done. - */ -static void jsf_write4(unsigned long fa, u32 data) { - - jsf_outl(fa, 0xAAAAAAAA); /* Unlock 1 Write 1 */ - jsf_outl(fa, 0x55555555); /* Unlock 1 Write 2 */ - jsf_outl(fa, 0xA0A0A0A0); /* Byte Program */ - jsf_outl(fa, data); - - jsf_wait(fa); -} - -/* - */ -static void jsfd_read(char *buf, unsigned long p, size_t togo) { - union byte4 { - char s[4]; - unsigned int n; - } b; - - while (togo >= 4) { - togo -= 4; - b.n = jsf_inl(p); - memcpy(buf, b.s, 4); - p += 4; - buf += 4; - } -} - -static int jsfd_queue; - -static struct request *jsfd_next_request(void) -{ - struct request_queue *q; - struct request *rq; - int old_pos = jsfd_queue; - - do { - q = jsfd_disk[jsfd_queue]->queue; - if (++jsfd_queue == JSF_MAX) - jsfd_queue = 0; - if (q) { - rq = blk_fetch_request(q); - if (rq) - return rq; - } - } while (jsfd_queue != old_pos); - - return NULL; -} - -static void jsfd_request(void) -{ - struct request *req; - - req = jsfd_next_request(); - while (req) { - struct jsfd_part *jdp = req->rq_disk->private_data; - unsigned long offset = blk_rq_pos(req) << 9; - size_t len = blk_rq_cur_bytes(req); - blk_status_t err = BLK_STS_IOERR; - void *p; - - if ((offset + len) > jdp->dsize) - goto end; - - if (rq_data_dir(req) != READ) { - printk(KERN_ERR "jsfd: write\n"); - goto end; - } - - if ((jdp->dbase & 0xff000000) != 0x20000000) { - printk(KERN_ERR "jsfd: bad base %x\n", (int)jdp->dbase); - goto end; - } - - p = kmap_atomic(bio_page(bio)) + bio_offset(bio); - jsfd_read(p, jdp->dbase + offset, len); - kunmap_atomic(p); - err = BLK_STS_OK; - end: - if (!__blk_end_request_cur(req, err)) - req = jsfd_next_request(); - } -} - -static void jsfd_do_request(struct request_queue *q) -{ - jsfd_request(); -} - -/* - * The memory devices use the full 32/64 bits of the offset, and so we cannot - * check against negative addresses: they are ok. The return value is weird, - * though, in that case (0). - * - * also note that seeking relative to the "end of file" isn't supported: - * it has no meaning, so it returns -EINVAL. - */ -static loff_t jsf_lseek(struct file * file, loff_t offset, int orig) -{ - loff_t ret; - - mutex_lock(&jsf_mutex); - switch (orig) { - case 0: - file->f_pos = offset; - ret = file->f_pos; - break; - case 1: - file->f_pos += offset; - ret = file->f_pos; - break; - default: - ret = -EINVAL; - } - mutex_unlock(&jsf_mutex); - return ret; -} - -/* - * OS SIMM Cannot be read in other size but a 32bits word. - */ -static ssize_t jsf_read(struct file * file, char __user * buf, - size_t togo, loff_t *ppos) -{ - unsigned long p = *ppos; - char __user *tmp = buf; - - union byte4 { - char s[4]; - unsigned int n; - } b; - - if (p < JSF_BASE_ALL || p >= JSF_BASE_TOP) { - return 0; - } - - if ((p + togo) < p /* wrap */ - || (p + togo) >= JSF_BASE_TOP) { - togo = JSF_BASE_TOP - p; - } - - if (p < JSF_BASE_ALL && togo != 0) { -#if 0 /* __bzero XXX */ - size_t x = JSF_BASE_ALL - p; - if (x > togo) x = togo; - clear_user(tmp, x); - tmp += x; - p += x; - togo -= x; -#else - /* - * Implementation of clear_user() calls __bzero - * without regard to modversions, - * so we cannot build a module. - */ - return 0; -#endif - } - - while (togo >= 4) { - togo -= 4; - b.n = jsf_inl(p); - if (copy_to_user(tmp, b.s, 4)) - return -EFAULT; - tmp += 4; - p += 4; - } - - /* - * XXX Small togo may remain if 1 byte is ordered. - * It would be nice if we did a word size read and unpacked it. - */ - - *ppos = p; - return tmp-buf; -} - -static ssize_t jsf_write(struct file * file, const char __user * buf, - size_t count, loff_t *ppos) -{ - return -ENOSPC; -} - -/* - */ -static int jsf_ioctl_erase(unsigned long arg) -{ - unsigned long p; - - /* p = jsf0.base; hits wrong bank */ - p = 0x20400000; - - jsf_outl(p, 0xAAAAAAAA); /* Unlock 1 Write 1 */ - jsf_outl(p, 0x55555555); /* Unlock 1 Write 2 */ - jsf_outl(p, 0x80808080); /* Erase setup */ - jsf_outl(p, 0xAAAAAAAA); /* Unlock 2 Write 1 */ - jsf_outl(p, 0x55555555); /* Unlock 2 Write 2 */ - jsf_outl(p, 0x10101010); /* Chip erase */ - -#if 0 - /* - * This code is ok, except that counter based timeout - * has no place in this world. Let's just drop timeouts... - */ - { - int i; - __u32 x; - for (i = 0; i < 1000000; i++) { - x = jsf_inl(p); - if ((x & 0x80808080) == 0x80808080) break; - } - if ((x & 0x80808080) != 0x80808080) { - printk("jsf0: erase timeout with 0x%08x\n", x); - } else { - printk("jsf0: erase done with 0x%08x\n", x); - } - } -#else - jsf_wait(p); -#endif - - return 0; -} - -/* - * Program a block of flash. - * Very simple because we can do it byte by byte anyway. - */ -static int jsf_ioctl_program(void __user *arg) -{ - struct jsflash_program_arg abuf; - char __user *uptr; - unsigned long p; - unsigned int togo; - union { - unsigned int n; - char s[4]; - } b; - - if (copy_from_user(&abuf, arg, JSFPRGSZ)) - return -EFAULT; - p = abuf.off; - togo = abuf.size; - if ((togo & 3) || (p & 3)) return -EINVAL; - - uptr = (char __user *) (unsigned long) abuf.data; - while (togo != 0) { - togo -= 4; - if (copy_from_user(&b.s[0], uptr, 4)) - return -EFAULT; - jsf_write4(p, b.n); - p += 4; - uptr += 4; - } - - return 0; -} - -static long jsf_ioctl(struct file *f, unsigned int cmd, unsigned long arg) -{ - mutex_lock(&jsf_mutex); - int error = -ENOTTY; - void __user *argp = (void __user *)arg; - - if (!capable(CAP_SYS_ADMIN)) { - mutex_unlock(&jsf_mutex); - return -EPERM; - } - switch (cmd) { - case JSFLASH_IDENT: - if (copy_to_user(argp, &jsf0.id, JSFIDSZ)) { - mutex_unlock(&jsf_mutex); - return -EFAULT; - } - break; - case JSFLASH_ERASE: - error = jsf_ioctl_erase(arg); - break; - case JSFLASH_PROGRAM: - error = jsf_ioctl_program(argp); - break; - } - - mutex_unlock(&jsf_mutex); - return error; -} - -static int jsf_mmap(struct file * file, struct vm_area_struct * vma) -{ - return -ENXIO; -} - -static int jsf_open(struct inode * inode, struct file * filp) -{ - mutex_lock(&jsf_mutex); - if (jsf0.base == 0) { - mutex_unlock(&jsf_mutex); - return -ENXIO; - } - if (test_and_set_bit(0, (void *)&jsf0.busy) != 0) { - mutex_unlock(&jsf_mutex); - return -EBUSY; - } - - mutex_unlock(&jsf_mutex); - return 0; /* XXX What security? */ -} - -static int jsf_release(struct inode *inode, struct file *file) -{ - jsf0.busy = 0; - return 0; -} - -static const struct file_operations jsf_fops = { - .owner = THIS_MODULE, - .llseek = jsf_lseek, - .read = jsf_read, - .write = jsf_write, - .unlocked_ioctl = jsf_ioctl, - .mmap = jsf_mmap, - .open = jsf_open, - .release = jsf_release, -}; - -static struct miscdevice jsf_dev = { JSF_MINOR, "jsflash", &jsf_fops }; - -static const struct block_device_operations jsfd_fops = { - .owner = THIS_MODULE, -}; - -static int jsflash_init(void) -{ - int rc; - struct jsflash *jsf; - phandle node; - char banner[128]; - struct linux_prom_registers reg0; - - node = prom_getchild(prom_root_node); - node = prom_searchsiblings(node, "flash-memory"); - if (node != 0 && (s32)node != -1) { - if (prom_getproperty(node, "reg", - (char *)®0, sizeof(reg0)) == -1) { - printk("jsflash: no \"reg\" property\n"); - return -ENXIO; - } - if (reg0.which_io != 0) { - printk("jsflash: bus number nonzero: 0x%x:%x\n", - reg0.which_io, reg0.phys_addr); - return -ENXIO; - } - /* - * Flash may be somewhere else, for instance on Ebus. - * So, don't do the following check for IIep flash space. - */ -#if 0 - if ((reg0.phys_addr >> 24) != 0x20) { - printk("jsflash: suspicious address: 0x%x:%x\n", - reg0.which_io, reg0.phys_addr); - return -ENXIO; - } -#endif - if ((int)reg0.reg_size <= 0) { - printk("jsflash: bad size 0x%x\n", (int)reg0.reg_size); - return -ENXIO; - } - } else { - /* XXX Remove this code once PROLL ID12 got widespread */ - printk("jsflash: no /flash-memory node, use PROLL >= 12\n"); - prom_getproperty(prom_root_node, "banner-name", banner, 128); - if (strcmp (banner, "JavaStation-NC") != 0 && - strcmp (banner, "JavaStation-E") != 0) { - return -ENXIO; - } - reg0.which_io = 0; - reg0.phys_addr = 0x20400000; - reg0.reg_size = 0x00800000; - } - - /* Let us be really paranoid for modifications to probing code. */ - if (sparc_cpu_model != sun4m) { - /* We must be on sun4m because we use MMU Bypass ASI. */ - return -ENXIO; - } - - if (jsf0.base == 0) { - jsf = &jsf0; - - jsf->base = reg0.phys_addr; - jsf->size = reg0.reg_size; - - /* XXX Redo the userland interface. */ - jsf->id.off = JSF_BASE_ALL; - jsf->id.size = 0x01000000; /* 16M - all segments */ - strcpy(jsf->id.name, "Krups_all"); - - jsf->dv[0].dbase = jsf->base; - jsf->dv[0].dsize = jsf->size; - jsf->dv[1].dbase = jsf->base + 1024; - jsf->dv[1].dsize = jsf->size - 1024; - jsf->dv[2].dbase = JSF_BASE_ALL; - jsf->dv[2].dsize = 0x01000000; - - printk("Espresso Flash @0x%lx [%d MB]\n", jsf->base, - (int) (jsf->size / (1024*1024))); - } - - if ((rc = misc_register(&jsf_dev)) != 0) { - printk(KERN_ERR "jsf: unable to get misc minor %d\n", - JSF_MINOR); - jsf0.base = 0; - return rc; - } - - return 0; -} - -static int jsfd_init(void) -{ - static DEFINE_SPINLOCK(lock); - struct jsflash *jsf; - struct jsfd_part *jdp; - int err; - int i; - - if (jsf0.base == 0) - return -ENXIO; - - err = -ENOMEM; - for (i = 0; i < JSF_MAX; i++) { - struct gendisk *disk = alloc_disk(1); - if (!disk) - goto out; - disk->queue = blk_init_queue(jsfd_do_request, &lock); - if (!disk->queue) { - put_disk(disk); - goto out; - } - jsfd_disk[i] = disk; - } - - if (register_blkdev(JSFD_MAJOR, "jsfd")) { - err = -EIO; - goto out; - } - - for (i = 0; i < JSF_MAX; i++) { - struct gendisk *disk = jsfd_disk[i]; - if ((i & JSF_PART_MASK) >= JSF_NPART) continue; - jsf = &jsf0; /* actually, &jsfv[i >> JSF_PART_BITS] */ - jdp = &jsf->dv[i&JSF_PART_MASK]; - - disk->major = JSFD_MAJOR; - disk->first_minor = i; - sprintf(disk->disk_name, "jsfd%d", i); - disk->fops = &jsfd_fops; - set_capacity(disk, jdp->dsize >> 9); - disk->private_data = jdp; - add_disk(disk); - set_disk_ro(disk, 1); - } - return 0; -out: - while (i--) - put_disk(jsfd_disk[i]); - return err; -} - -MODULE_LICENSE("GPL"); - -static int __init jsflash_init_module(void) { - int rc; - - if ((rc = jsflash_init()) == 0) { - jsfd_init(); - return 0; - } - return rc; -} - -static void __exit jsflash_cleanup_module(void) -{ - int i; - - for (i = 0; i < JSF_MAX; i++) { - if ((i & JSF_PART_MASK) >= JSF_NPART) continue; - del_gendisk(jsfd_disk[i]); - blk_cleanup_queue(jsfd_disk[i]->queue); - put_disk(jsfd_disk[i]); - } - if (jsf0.busy) - printk("jsf0: cleaning busy unit\n"); - jsf0.base = 0; - jsf0.busy = 0; - - misc_deregister(&jsf_dev); - unregister_blkdev(JSFD_MAJOR, "jsfd"); -} - -module_init(jsflash_init_module); -module_exit(jsflash_cleanup_module); |