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authorRichard Purdie <rpurdie@rpsys.net>2008-02-06 11:18:22 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2008-02-07 11:31:23 +0100
commit6c77fd649fab4bea1b44cb534381a22e37650bc3 (patch)
tree757f0048c4422b0872d425f9e8c4a30688001e82 /drivers/mtd
parent[MTD] mtdoops: Use the panic_write function when present (diff)
downloadlinux-6c77fd649fab4bea1b44cb534381a22e37650bc3.tar.xz
linux-6c77fd649fab4bea1b44cb534381a22e37650bc3.zip
[MTD] onenand: Add panic_write function to the onenand driver
Implement the panic_write function for the onenand driver. This waits for any active command to complete/timeout, performs the write, waits for it to complete and then returns. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/onenand/onenand_base.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index b281b116aaeb..8d7d21be1541 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
+#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/mtd/mtd.h>
@@ -1284,6 +1285,112 @@ static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr,
#define NOTALIGNED(x) ((x & (this->subpagesize - 1)) != 0)
+static void onenand_panic_wait(struct mtd_info *mtd)
+{
+ struct onenand_chip *this = mtd->priv;
+ unsigned int interrupt;
+ int i;
+
+ for (i = 0; i < 2000; i++) {
+ interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
+ if (interrupt & ONENAND_INT_MASTER)
+ break;
+ udelay(10);
+ }
+}
+
+/**
+ * onenand_panic_write - [MTD Interface] write buffer to FLASH in a panic context
+ * @param mtd MTD device structure
+ * @param to offset to write to
+ * @param len number of bytes to write
+ * @param retlen pointer to variable to store the number of written bytes
+ * @param buf the data to write
+ *
+ * Write with ECC
+ */
+static int onenand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct onenand_chip *this = mtd->priv;
+ int column, subpage;
+ int written = 0;
+ int ret = 0;
+
+ if (this->state == FL_PM_SUSPENDED)
+ return -EBUSY;
+
+ /* Wait for any existing operation to clear */
+ onenand_panic_wait(mtd);
+
+ DEBUG(MTD_DEBUG_LEVEL3, "onenand_panic_write: to = 0x%08x, len = %i\n",
+ (unsigned int) to, (int) len);
+
+ /* Initialize retlen, in case of early exit */
+ *retlen = 0;
+
+ /* Do not allow writes past end of device */
+ if (unlikely((to + len) > mtd->size)) {
+ printk(KERN_ERR "onenand_panic_write: Attempt write to past end of device\n");
+ return -EINVAL;
+ }
+
+ /* Reject writes, which are not page aligned */
+ if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
+ printk(KERN_ERR "onenand_panic_write: Attempt to write not page aligned data\n");
+ return -EINVAL;
+ }
+
+ column = to & (mtd->writesize - 1);
+
+ /* Loop until all data write */
+ while (written < len) {
+ int thislen = min_t(int, mtd->writesize - column, len - written);
+ u_char *wbuf = (u_char *) buf;
+
+ this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
+
+ /* Partial page write */
+ subpage = thislen < mtd->writesize;
+ if (subpage) {
+ memset(this->page_buf, 0xff, mtd->writesize);
+ memcpy(this->page_buf + column, buf, thislen);
+ wbuf = this->page_buf;
+ }
+
+ this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
+ this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
+
+ this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
+
+ onenand_panic_wait(mtd);
+
+ /* In partial page write we don't update bufferram */
+ onenand_update_bufferram(mtd, to, !ret && !subpage);
+ if (ONENAND_IS_2PLANE(this)) {
+ ONENAND_SET_BUFFERRAM1(this);
+ onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
+ }
+
+ if (ret) {
+ printk(KERN_ERR "onenand_panic_write: write failed %d\n", ret);
+ break;
+ }
+
+ written += thislen;
+
+ if (written == len)
+ break;
+
+ column = 0;
+ to += thislen;
+ buf += thislen;
+ }
+
+ *retlen = written;
+ return ret;
+}
+
/**
* onenand_fill_auto_oob - [Internal] oob auto-placement transfer
* @param mtd MTD device structure
@@ -2673,6 +2780,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
mtd->write = onenand_write;
mtd->read_oob = onenand_read_oob;
mtd->write_oob = onenand_write_oob;
+ mtd->panic_write = onenand_panic_write;
#ifdef CONFIG_MTD_ONENAND_OTP
mtd->get_fact_prot_info = onenand_get_fact_prot_info;
mtd->read_fact_prot_reg = onenand_read_fact_prot_reg;