1 files changed, 283 insertions, 0 deletions
diff --git a/package/linux/kernel-source/drivers/mtd/devices/sflash.c b/package/linux/kernel-source/drivers/mtd/devices/sflash.c
new file mode 100644
index 000000000..4dbd76d87
--- /dev/null
+++ b/package/linux/kernel-source/drivers/mtd/devices/sflash.c
@@ -0,0 +1,283 @@
+/*
+ * Broadcom SiliconBackplane chipcommon serial flash interface
+ *
+ * Copyright 2004, Broadcom Corporation      
+ * All Rights Reserved.      
+ *       
+ * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY      
+ * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM      
+ * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS      
+ * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.      
+ *
+ * $Id$
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/mtd/compatmac.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+
+#include <typedefs.h>
+#include <bcmdevs.h>
+#include <bcmutils.h>
+#include <osl.h>
+#include <bcmutils.h>
+#include <bcmnvram.h>
+#include <sbconfig.h>
+#include <sbchipc.h>
+#include <sflash.h>
+
+#ifdef CONFIG_MTD_PARTITIONS
+extern struct mtd_partition * init_mtd_partitions(struct mtd_info *mtd, size_t size);
+#endif
+
+struct sflash_mtd {
+	chipcregs_t *cc;
+	struct semaphore lock;
+	struct mtd_info mtd;
+	struct mtd_erase_region_info region;
+};
+
+/* Private global state */
+static struct sflash_mtd sflash;
+
+static int
+sflash_mtd_poll(struct sflash_mtd *sflash, unsigned int offset, int timeout)
+{
+	int now = jiffies;
+	int ret = 0;
+
+	for (;;) {
+		if (!sflash_poll(sflash->cc, offset)) {
+			ret = 0;
+			break;
+		}
+		if (time_after(jiffies, now + timeout)) {
+			printk(KERN_ERR "sflash: timeout\n");
+			ret = -ETIMEDOUT;
+			break;
+		}
+		if (current->need_resched) {
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			schedule_timeout(timeout / 10);
+		} else
+			udelay(1);
+	}
+
+	return ret;
+}
+
+static int
+sflash_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
+{
+	struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv;
+	int bytes, ret = 0;
+
+	/* Check address range */
+	if (!len)
+		return 0;
+	if ((from + len) > mtd->size)
+		return -EINVAL;
+	
+	down(&sflash->lock);
+
+	*retlen = 0;
+	while (len) {
+		if ((bytes = sflash_read(sflash->cc, (uint) from, len, buf)) < 0) {
+			ret = bytes;
+			break;
+		}
+		from += (loff_t) bytes;
+		len -= bytes;
+		buf += bytes;
+		*retlen += bytes;
+	}
+
+	up(&sflash->lock);
+
+	return ret;
+}
+
+static int
+sflash_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
+{
+	struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv;
+	int bytes, ret = 0;
+
+	/* Check address range */
+	if (!len)
+		return 0;
+	if ((to + len) > mtd->size)
+		return -EINVAL;
+
+	down(&sflash->lock);
+
+	*retlen = 0;
+	while (len) {
+		if ((bytes = sflash_write(sflash->cc, (uint) to, len, buf)) < 0) {
+			ret = bytes;
+			break;
+		}
+		if ((ret = sflash_mtd_poll(sflash, (unsigned int) to, HZ / 10)))
+			break;
+		to += (loff_t) bytes;
+		len -= bytes;
+		buf += bytes;
+		*retlen += bytes;
+	}
+
+	up(&sflash->lock);
+
+	return ret;
+}
+
+static int
+sflash_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
+{
+	struct sflash_mtd *sflash = (struct sflash_mtd *) mtd->priv;
+	int i, j, ret = 0;
+	unsigned int addr, len;
+
+	/* Check address range */
+	if (!erase->len)
+		return 0;
+	if ((erase->addr + erase->len) > mtd->size)
+		return -EINVAL;
+
+	addr = erase->addr;
+	len = erase->len;
+
+	down(&sflash->lock);
+
+	/* Ensure that requested region is aligned */
+	for (i = 0; i < mtd->numeraseregions; i++) {
+		for (j = 0; j < mtd->eraseregions[i].numblocks; j++) {
+			if (addr == mtd->eraseregions[i].offset + mtd->eraseregions[i].erasesize * j &&
+			    len >= mtd->eraseregions[i].erasesize) {
+				if ((ret = sflash_erase(sflash->cc, addr)) < 0)
+					break;
+				if ((ret = sflash_mtd_poll(sflash, addr, 10 * HZ)))
+					break;
+				addr += mtd->eraseregions[i].erasesize;
+				len -= mtd->eraseregions[i].erasesize;
+			}
+		}
+		if (ret)
+			break;
+	}
+
+	up(&sflash->lock);
+
+	/* Set erase status */
+	if (ret)
+		erase->state = MTD_ERASE_FAILED;
+	else 
+		erase->state = MTD_ERASE_DONE;
+
+	/* Call erase callback */
+	if (erase->callback)
+		erase->callback(erase);
+
+	return ret;
+}
+
+#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
+#define sflash_mtd_init init_module
+#define sflash_mtd_exit cleanup_module
+#endif
+
+mod_init_t
+sflash_mtd_init(void)
+{
+	struct pci_dev *pdev;
+	int ret = 0;
+	struct sflash *info;
+	uint i;
+#ifdef CONFIG_MTD_PARTITIONS
+	struct mtd_partition *parts;
+#endif
+
+	if (!(pdev = pci_find_device(VENDOR_BROADCOM, SB_CC, NULL))) {
+		printk(KERN_ERR "sflash: chipcommon not found\n");
+		return -ENODEV;
+	}
+
+	memset(&sflash, 0, sizeof(struct sflash_mtd));
+	init_MUTEX(&sflash.lock);
+
+	/* Map registers and flash base */
+	if (!(sflash.cc = ioremap_nocache(pci_resource_start(pdev, 0),
+					  pci_resource_len(pdev, 0)))) {
+		printk(KERN_ERR "sflash: error mapping registers\n");
+		ret = -EIO;
+		goto fail;
+	}
+
+	/* Initialize serial flash access */
+	info = sflash_init(sflash.cc);
+
+	if (!info) {
+		printk(KERN_ERR "sflash: found no supported devices\n");
+		ret = -ENODEV;
+		goto fail;
+	}
+
+	/* Setup region info */
+	sflash.region.offset = 0;
+	sflash.region.erasesize = info->blocksize;
+	sflash.region.numblocks = info->numblocks;
+	if (sflash.region.erasesize > sflash.mtd.erasesize)
+		sflash.mtd.erasesize = sflash.region.erasesize;
+	sflash.mtd.size = info->size;
+	sflash.mtd.numeraseregions = 1;
+
+	/* Register with MTD */
+	sflash.mtd.name = "sflash";
+	sflash.mtd.type = MTD_NORFLASH;
+	sflash.mtd.flags = MTD_CAP_NORFLASH;
+	sflash.mtd.eraseregions = &sflash.region;
+	sflash.mtd.module = THIS_MODULE;
+	sflash.mtd.erase = sflash_mtd_erase;
+	sflash.mtd.read = sflash_mtd_read;
+	sflash.mtd.write = sflash_mtd_write;
+	sflash.mtd.priv = &sflash;
+
+#ifdef CONFIG_MTD_PARTITIONS
+	parts = init_mtd_partitions(&sflash.mtd, sflash.mtd.size);
+	for (i = 0; parts[i].name; i++);
+	ret = add_mtd_partitions(&sflash.mtd, parts, i);
+#else
+	ret = add_mtd_device(&sflash.mtd);
+#endif
+	if (ret) {
+		printk(KERN_ERR "sflash: add_mtd failed\n");
+		goto fail;
+	}
+
+	return 0;
+
+ fail:
+	if (sflash.cc)
+		iounmap((void *) sflash.cc);
+	return ret;
+}
+
+mod_exit_t
+sflash_mtd_exit(void)
+{
+#ifdef CONFIG_MTD_PARTITIONS
+	del_mtd_partitions(&sflash.mtd);
+#else
+	del_mtd_device(&sflash.mtd);
+#endif
+	iounmap((void *) sflash.cc);
+}
+
+module_init(sflash_mtd_init);
+module_exit(sflash_mtd_exit);