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Diffstat (limited to 'drivers/sbus/char/jsflash.c')
-rw-r--r--drivers/sbus/char/jsflash.c627
1 files changed, 627 insertions, 0 deletions
diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
new file mode 100644
index 0000000..c12c504
--- /dev/null
+++ b/drivers/sbus/char/jsflash.c
@@ -0,0 +1,627 @@
+/*
+ * 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 exeedingly 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/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/fcntl.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+
+#define MAJOR_NR JSFD_MAJOR
+
+#include <asm/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 */
+
+/*
+ * 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 void jsfd_do_request(request_queue_t *q)
+{
+ struct request *req;
+
+ while ((req = elv_next_request(q)) != NULL) {
+ struct jsfd_part *jdp = req->rq_disk->private_data;
+ unsigned long offset = req->sector << 9;
+ size_t len = req->current_nr_sectors << 9;
+
+ if ((offset + len) > jdp->dsize) {
+ end_request(req, 0);
+ continue;
+ }
+
+ if (rq_data_dir(req) != READ) {
+ printk(KERN_ERR "jsfd: write\n");
+ end_request(req, 0);
+ continue;
+ }
+
+ if ((jdp->dbase & 0xff000000) != 0x20000000) {
+ printk(KERN_ERR "jsfd: bad base %x\n", (int)jdp->dbase);
+ end_request(req, 0);
+ continue;
+ }
+
+ jsfd_read(req->buffer, jdp->dbase + offset, len);
+
+ end_request(req, 1);
+ }
+}
+
+/*
+ * 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;
+
+ lock_kernel();
+ 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;
+ }
+ unlock_kernel();
+ return ret;
+}
+
+/*
+ * OS SIMM Cannot be read in other size but a 32bits word.
+ */
+static ssize_t jsf_read(struct file * file, char * buf,
+ size_t togo, loff_t *ppos)
+{
+ unsigned long p = *ppos;
+ char *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 * 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(unsigned long arg)
+{
+ struct jsflash_program_arg abuf;
+ char *uptr;
+ unsigned long p;
+ unsigned int togo;
+ union {
+ unsigned int n;
+ char s[4];
+ } b;
+
+ if (copy_from_user(&abuf, (char *)arg, JSFPRGSZ))
+ return -EFAULT;
+ p = abuf.off;
+ togo = abuf.size;
+ if ((togo & 3) || (p & 3)) return -EINVAL;
+
+ uptr = (char *) (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 int jsf_ioctl(struct inode *inode, struct file *f, unsigned int cmd,
+ unsigned long arg)
+{
+ int error = -ENOTTY;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ switch (cmd) {
+ case JSFLASH_IDENT:
+ if (copy_to_user((void *)arg, &jsf0.id, JSFIDSZ))
+ return -EFAULT;
+ break;
+ case JSFLASH_ERASE:
+ error = jsf_ioctl_erase(arg);
+ break;
+ case JSFLASH_PROGRAM:
+ error = jsf_ioctl_program(arg);
+ break;
+ }
+
+ 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)
+{
+
+ if (jsf0.base == 0) return -ENXIO;
+ if (test_and_set_bit(0, (void *)&jsf0.busy) != 0)
+ return -EBUSY;
+
+ return 0; /* XXX What security? */
+}
+
+static int jsf_release(struct inode *inode, struct file *file)
+{
+ jsf0.busy = 0;
+ return 0;
+}
+
+static struct file_operations jsf_fops = {
+ .owner = THIS_MODULE,
+ .llseek = jsf_lseek,
+ .read = jsf_read,
+ .write = jsf_write,
+ .ioctl = jsf_ioctl,
+ .mmap = jsf_mmap,
+ .open = jsf_open,
+ .release = jsf_release,
+};
+
+static struct miscdevice jsf_dev = { JSF_MINOR, "jsflash", &jsf_fops };
+
+static struct block_device_operations jsfd_fops = {
+ .owner = THIS_MODULE,
+};
+
+static int jsflash_init(void)
+{
+ int rc;
+ struct jsflash *jsf;
+ int node;
+ char banner[128];
+ struct linux_prom_registers reg0;
+
+ node = prom_getchild(prom_root_node);
+ node = prom_searchsiblings(node, "flash-memory");
+ if (node != 0 && node != -1) {
+ if (prom_getproperty(node, "reg",
+ (char *)&reg0, 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. */
+ /* extern enum sparc_cpu sparc_cpu_model; */ /* in <asm/system.h> */
+ 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 struct request_queue *jsf_queue;
+
+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;
+ jsfd_disk[i] = disk;
+ }
+
+ if (register_blkdev(JSFD_MAJOR, "jsfd")) {
+ err = -EIO;
+ goto out;
+ }
+
+ jsf_queue = blk_init_queue(jsfd_do_request, &lock);
+ if (!jsf_queue) {
+ err = -ENOMEM;
+ unregister_blkdev(JSFD_MAJOR, "jsfd");
+ 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;
+ disk->queue = jsf_queue;
+ 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]);
+ put_disk(jsfd_disk[i]);
+ }
+ if (jsf0.busy)
+ printk("jsf0: cleaning busy unit\n");
+ jsf0.base = 0;
+ jsf0.busy = 0;
+
+ misc_deregister(&jsf_dev);
+ if (unregister_blkdev(JSFD_MAJOR, "jsfd") != 0)
+ printk("jsfd: cleanup_module failed\n");
+ blk_cleanup_queue(jsf_queue);
+}
+
+module_init(jsflash_init_module);
+module_exit(jsflash_cleanup_module);
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