kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

[MTD] onenand: Add panic_write function to the onenand driver

Browse source 
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>
This commit is contained in:
Richard Purdie 2008-02-06 10:18:22 +00:00 committed by David Woodhouse
parent 621e4f8e9b
commit 6c77fd649f
1 changed files with 108 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

108
drivers/mtd/onenand/onenand_base.c
View file

@ -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;