1 files changed, 635 insertions, 0 deletions

diff --git a/kernel/drivers/sbus/char/jsflash.c b/kernel/drivers/sbus/char/jsflash.c
new file mode 100644
index 000000000..a40ee1e37
--- /dev/null
+++ b/kernel/drivers/sbus/char/jsflash.c
@@ -0,0 +1,635 @@
+/*
+ * 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 <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 */
+
+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 void jsfd_do_request(struct request_queue *q)
+{
+	struct request *req;
+
+	req = blk_fetch_request(q);
+	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);
+		int err = -EIO;
+
+		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;
+		}
+
+		jsfd_read(bio_data(req->bio), jdp->dbase + offset, len);
+		err = 0;
+	end:
+		if (!__blk_end_request_cur(req, err))
+			req = blk_fetch_request(q);
+	}
+}
+
+/*
+ * 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 *)&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. */
+	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);
+	unregister_blkdev(JSFD_MAJOR, "jsfd");
+	blk_cleanup_queue(jsf_queue);
+}
+
+module_init(jsflash_init_module);
+module_exit(jsflash_cleanup_module);