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 000000000000..c12c5046e2fa
--- /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);