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mtd: docg3: add write functions

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Add write capability to the docg3 driver. The writes are
possible on a single page (512 bytes + 16 bytes), even if
that page is split on 2 physical pages on 2 blocks (each on
one plane).

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Reviewed-by: Ivan Djelic <ivan.djelic@parrot.com>
Reviewed-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Robert Jarzmik 2011-11-19 16:02:52 +01:00 committed by David Woodhouse
parent 316e627edc
commit fb50b58e48
1 changed files with 542 additions and 13 deletions
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555
drivers/mtd/devices/docg3.c
View file

@ -253,6 +253,40 @@ static void doc_read_data_area(struct docg3 *docg3, void *buf, int len,
}
}
/**
* doc_write_data_area - Write data into data area
* @docg3: the device
* @buf: the buffer to get input bytes from
* @len: the length to write
*
* Writes bytes into flash data. Handles the single byte / even bytes writes.
*/
static void doc_write_data_area(struct docg3 *docg3, const void *buf, int len)
{
int i, cdr, len4;
u16 *src16;
u8 *src8;
doc_dbg("doc_write_data_area(buf=%p, len=%d)\n", buf, len);
cdr = len & 0x3;
len4 = len - cdr;
doc_writew(docg3, DOC_IOSPACE_DATA, DOC_READADDRESS);
src16 = (u16 *)buf;
for (i = 0; i < len4; i += 2) {
doc_writew(docg3, *src16, DOC_IOSPACE_DATA);
src16++;
}
src8 = (u8 *)src16;
for (i = 0; i < cdr; i++) {
doc_writew(docg3, DOC_IOSPACE_DATA | DOC_READADDR_ONE_BYTE,
DOC_READADDRESS);
doc_writeb(docg3, *src8, DOC_IOSPACE_DATA);
src8++;
}
}
/**
* doc_set_data_mode - Sets the flash to reliable data mode
* @docg3: the device
@ -342,6 +376,37 @@ static int doc_set_extra_page_mode(struct docg3 *docg3)
return 0;
}
/**
* doc_setup_addr_sector - Setup blocks/page/ofs address for one plane
* @docg3: the device
* @sector: the sector
*/
static void doc_setup_addr_sector(struct docg3 *docg3, int sector)
{
doc_delay(docg3, 1);
doc_flash_address(docg3, sector & 0xff);
doc_flash_address(docg3, (sector >> 8) & 0xff);
doc_flash_address(docg3, (sector >> 16) & 0xff);
doc_delay(docg3, 1);
}
/**
* doc_setup_writeaddr_sector - Setup blocks/page/ofs address for one plane
* @docg3: the device
* @sector: the sector
* @ofs: the offset in the page, between 0 and (512 + 16 + 512)
*/
static void doc_setup_writeaddr_sector(struct docg3 *docg3, int sector, int ofs)
{
ofs = ofs >> 2;
doc_delay(docg3, 1);
doc_flash_address(docg3, ofs & 0xff);
doc_flash_address(docg3, sector & 0xff);
doc_flash_address(docg3, (sector >> 8) & 0xff);
doc_flash_address(docg3, (sector >> 16) & 0xff);
doc_delay(docg3, 1);
}
/**
* doc_seek - Set both flash planes to the specified block, page for reading
* @docg3: the device
@ -378,27 +443,73 @@ static int doc_read_seek(struct docg3 *docg3, int block0, int block1, int page,
if (ret)
goto out;
sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
doc_flash_sequence(docg3, DOC_SEQ_READ);
sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
doc_delay(docg3, 1);
doc_flash_address(docg3, sector & 0xff);
doc_flash_address(docg3, (sector >> 8) & 0xff);
doc_flash_address(docg3, (sector >> 16) & 0xff);
doc_delay(docg3, 1);
doc_setup_addr_sector(docg3, sector);
sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
doc_setup_addr_sector(docg3, sector);
doc_delay(docg3, 1);
doc_flash_address(docg3, sector & 0xff);
doc_flash_address(docg3, (sector >> 8) & 0xff);
doc_flash_address(docg3, (sector >> 16) & 0xff);
doc_delay(docg3, 2);
out:
return ret;
}
/**
* doc_write_seek - Set both flash planes to the specified block, page for writing
* @docg3: the device
* @block0: the first plane block index
* @block1: the second plane block index
* @page: the page index within the block
* @ofs: offset in page to write
*
* Programs the flash even and odd planes to the specific block and page.
* Alternatively, programs the flash to the wear area of the specified page.
*/
static int doc_write_seek(struct docg3 *docg3, int block0, int block1, int page,
int ofs)
{
int ret = 0, sector;
doc_dbg("doc_write_seek(blocks=(%d,%d), page=%d, ofs=%d)\n",
block0, block1, page, ofs);
doc_set_reliable_mode(docg3);
if (ofs < 2 * DOC_LAYOUT_PAGE_SIZE) {
doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE1);
doc_flash_command(docg3, DOC_CMD_READ_PLANE1);
doc_delay(docg3, 2);
} else {
doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE2);
doc_flash_command(docg3, DOC_CMD_READ_PLANE2);
doc_delay(docg3, 2);
}
doc_flash_sequence(docg3, DOC_SEQ_PAGE_SETUP);
doc_flash_command(docg3, DOC_CMD_PROG_CYCLE1);
sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
doc_setup_writeaddr_sector(docg3, sector, ofs);
doc_flash_command(docg3, DOC_CMD_PROG_CYCLE3);
doc_delay(docg3, 2);
ret = doc_wait_ready(docg3);
if (ret)
goto out;
doc_flash_command(docg3, DOC_CMD_PROG_CYCLE1);
sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
doc_setup_writeaddr_sector(docg3, sector, ofs);
doc_delay(docg3, 1);
out:
return ret;
}
/**
* doc_read_page_ecc_init - Initialize hardware ECC engine
* @docg3: the device
@ -420,6 +531,58 @@ static int doc_read_page_ecc_init(struct docg3 *docg3, int len)
return doc_wait_ready(docg3);
}
/**
* doc_write_page_ecc_init - Initialize hardware BCH ECC engine
* @docg3: the device
* @len: the number of bytes covered by the ECC (BCH covered)
*
* The function does initialize the hardware ECC engine to compute the Hamming
* ECC (on 1 byte) and the BCH Syndroms (on 7 bytes).
*
* Return 0 if succeeded, -EIO on error
*/
static int doc_write_page_ecc_init(struct docg3 *docg3, int len)
{
doc_writew(docg3, !DOC_ECCCONF0_READ_MODE
| DOC_ECCCONF0_BCH_ENABLE | DOC_ECCCONF0_HAMMING_ENABLE
| (len & DOC_ECCCONF0_DATA_BYTES_MASK),
DOC_ECCCONF0);
doc_delay(docg3, 4);
doc_register_readb(docg3, DOC_FLASHCONTROL);
return doc_wait_ready(docg3);
}
/**
* doc_ecc_disable - Disable Hamming and BCH ECC hardware calculator
* @docg3: the device
*
* Disables the hardware ECC generator and checker, for unchecked reads (as when
* reading OOB only or write status byte).
*/
static void doc_ecc_disable(struct docg3 *docg3)
{
doc_writew(docg3, DOC_ECCCONF0_READ_MODE, DOC_ECCCONF0);
doc_delay(docg3, 4);
}
/**
* doc_hamming_ecc_init - Initialize hardware Hamming ECC engine
* @docg3: the device
* @nb_bytes: the number of bytes covered by the ECC (Hamming covered)
*
* This function programs the ECC hardware to compute the hamming code on the
* last provided N bytes to the hardware generator.
*/
static void doc_hamming_ecc_init(struct docg3 *docg3, int nb_bytes)
{
u8 ecc_conf1;
ecc_conf1 = doc_register_readb(docg3, DOC_ECCCONF1);
ecc_conf1 &= ~DOC_ECCCONF1_HAMMING_BITS_MASK;
ecc_conf1 |= (nb_bytes & DOC_ECCCONF1_HAMMING_BITS_MASK);
doc_writeb(docg3, ecc_conf1, DOC_ECCCONF1);
}
/**
* doc_read_page_prepare - Prepares reading data from a flash page
* @docg3: the device
@ -505,12 +668,26 @@ static int doc_read_page_getbytes(struct docg3 *docg3, int len, u_char *buf,
return len;
}
/**
* doc_write_page_putbytes - Writes bytes into a prepared page
* @docg3: the device
* @len: the number of bytes to be written
* @buf: the buffer of input bytes
*
*/
static void doc_write_page_putbytes(struct docg3 *docg3, int len,
const u_char *buf)
{
doc_write_data_area(docg3, buf, len);
doc_delay(docg3, 2);
}
/**
* doc_get_hw_bch_syndroms - Get hardware calculated BCH syndroms
* @docg3: the device
* @syns: the array of 7 integers where the syndroms will be stored
*/
static void doc_get_hw_bch_syndroms(struct docg3 *docg3, int *syns)
static void doc_get_hw_bch_syndroms(struct docg3 *docg3, u8 *syns)
{
int i;
@ -518,6 +695,16 @@ static void doc_get_hw_bch_syndroms(struct docg3 *docg3, int *syns)
syns[i] = doc_register_readb(docg3, DOC_BCH_SYNDROM(i));
}
/**
* doc_page_finish - Ends reading/writing of a flash page
* @docg3: the device
*/
static void doc_page_finish(struct docg3 *docg3)
{
doc_writeb(docg3, 0, DOC_DATAEND);
doc_delay(docg3, 2);
}
/**
* doc_read_page_finish - Ends reading of a flash page
* @docg3: the device
@ -528,8 +715,7 @@ static void doc_get_hw_bch_syndroms(struct docg3 *docg3, int *syns)
*/
static void doc_read_page_finish(struct docg3 *docg3)
{
doc_writeb(docg3, 0, DOC_DATAEND);
doc_delay(docg3, 2);
doc_page_finish(docg3);
doc_set_device_id(docg3, 0);
}
@ -791,6 +977,348 @@ static int doc_get_erase_count(struct docg3 *docg3, loff_t from)
return max(plane1_erase_count, plane2_erase_count);
}
/**
* doc_get_op_status - get erase/write operation status
* @docg3: the device
*
* Queries the status from the chip, and returns it
*
* Returns the status (bits DOC_PLANES_STATUS_*)
*/
static int doc_get_op_status(struct docg3 *docg3)
{
u8 status;
doc_flash_sequence(docg3, DOC_SEQ_PLANES_STATUS);
doc_flash_command(docg3, DOC_CMD_PLANES_STATUS);
doc_delay(docg3, 5);
doc_ecc_disable(docg3);
doc_read_data_area(docg3, &status, 1, 1);
return status;
}
/**
* doc_write_erase_wait_status - wait for write or erase completion
* @docg3: the device
*
* Wait for the chip to be ready again after erase or write operation, and check
* erase/write status.
*
* Returns 0 if erase successfull, -EIO if erase/write issue, -ETIMEOUT if
* timeout
*/
static int doc_write_erase_wait_status(struct docg3 *docg3)
{
int status, ret = 0;
if (!doc_is_ready(docg3))
usleep_range(3000, 3000);
if (!doc_is_ready(docg3)) {
doc_dbg("Timeout reached and the chip is still not ready\n");
ret = -EAGAIN;
goto out;
}
status = doc_get_op_status(docg3);
if (status & DOC_PLANES_STATUS_FAIL) {
doc_dbg("Erase/Write failed on (a) plane(s), status = %x\n",
status);
ret = -EIO;
}
out:
doc_page_finish(docg3);
return ret;
}
/**
* doc_write_page - Write a single page to the chip
* @docg3: the device
* @to: the offset from first block and first page, in bytes, aligned on page
* size
* @buf: buffer to get bytes from
* @oob: buffer to get out of band bytes from (can be NULL if no OOB should be
* written)
* @autoecc: if 0, all 16 bytes from OOB are taken, regardless of HW Hamming or
* BCH computations. If 1, only bytes 0-7 and byte 15 are taken,
* remaining ones are filled with hardware Hamming and BCH
* computations. Its value is not meaningfull is oob == NULL.
*
* Write one full page (ie. 1 page split on two planes), of 512 bytes, with the
* OOB data. The OOB ECC is automatically computed by the hardware Hamming and
* BCH generator if autoecc is not null.
*
* Returns 0 if write successful, -EIO if write error, -EAGAIN if timeout
*/
static int doc_write_page(struct docg3 *docg3, loff_t to, const u_char *buf,
const u_char *oob, int autoecc)
{
int block0, block1, page, ret, ofs = 0;
u8 syn[DOC_ECC_BCH_SIZE], hamming;
doc_dbg("doc_write_page(to=%lld)\n", to);
calc_block_sector(to, &block0, &block1, &page, &ofs);
doc_set_device_id(docg3, docg3->device_id);
ret = doc_reset_seq(docg3);
if (ret)
goto err;
/* Program the flash address block and page */
ret = doc_write_seek(docg3, block0, block1, page, ofs);
if (ret)
goto err;
doc_write_page_ecc_init(docg3, DOC_ECC_BCH_COVERED_BYTES);
doc_delay(docg3, 2);
doc_write_page_putbytes(docg3, DOC_LAYOUT_PAGE_SIZE, buf);
if (oob && autoecc) {
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ, oob);
doc_delay(docg3, 2);
oob += DOC_LAYOUT_OOB_UNUSED_OFS;
hamming = doc_register_readb(docg3, DOC_HAMMINGPARITY);
doc_delay(docg3, 2);
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_HAMMING_SZ,
&hamming);
doc_delay(docg3, 2);
doc_get_hw_bch_syndroms(docg3, syn);
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_BCH_SZ, syn);
doc_delay(docg3, 2);
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_UNUSED_SZ, oob);
}
if (oob && !autoecc)
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_SIZE, oob);
doc_delay(docg3, 2);
doc_page_finish(docg3);
doc_delay(docg3, 2);
doc_flash_command(docg3, DOC_CMD_PROG_CYCLE2);
doc_delay(docg3, 2);
/*
* The wait status will perform another doc_page_finish() call, but that
* seems to please the docg3, so leave it.
*/
ret = doc_write_erase_wait_status(docg3);
return ret;
err:
doc_read_page_finish(docg3);
return ret;
}
/**
* doc_guess_autoecc - Guess autoecc mode from mbd_oob_ops
* @ops: the oob operations
*
* Returns 0 or 1 if success, -EINVAL if invalid oob mode
*/
static int doc_guess_autoecc(struct mtd_oob_ops *ops)
{
int autoecc;
switch (ops->mode) {
case MTD_OPS_PLACE_OOB:
case MTD_OPS_AUTO_OOB:
autoecc = 1;
break;
case MTD_OPS_RAW:
autoecc = 0;
break;
default:
autoecc = -EINVAL;
}
return autoecc;
}
/**
* doc_fill_autooob - Fill a 16 bytes OOB from 8 non-ECC bytes
* @dst: the target 16 bytes OOB buffer
* @oobsrc: the source 8 bytes non-ECC OOB buffer
*
*/
static void doc_fill_autooob(u8 *dst, u8 *oobsrc)
{
memcpy(dst, oobsrc, DOC_LAYOUT_OOB_PAGEINFO_SZ);
dst[DOC_LAYOUT_OOB_UNUSED_OFS] = oobsrc[DOC_LAYOUT_OOB_PAGEINFO_SZ];
}
/**
* doc_backup_oob - Backup OOB into docg3 structure
* @docg3: the device
* @to: the page offset in the chip
* @ops: the OOB size and buffer
*
* As the docg3 should write a page with its OOB in one pass, and some userland
* applications do write_oob() to setup the OOB and then write(), store the OOB
* into a temporary storage. This is very dangerous, as 2 concurrent
* applications could store an OOB, and then write their pages (which will
* result into one having its OOB corrupted).
*
* The only reliable way would be for userland to call doc_write_oob() with both
* the page data _and_ the OOB area.
*
* Returns 0 if success, -EINVAL if ops content invalid
*/
static int doc_backup_oob(struct docg3 *docg3, loff_t to,
struct mtd_oob_ops *ops)
{
int ooblen = ops->ooblen, autoecc;
if (ooblen != DOC_LAYOUT_OOB_SIZE)
return -EINVAL;
autoecc = doc_guess_autoecc(ops);
if (autoecc < 0)
return autoecc;
docg3->oob_write_ofs = to;
docg3->oob_autoecc = autoecc;
if (ops->mode == MTD_OPS_AUTO_OOB) {
doc_fill_autooob(docg3->oob_write_buf, ops->oobbuf);
ops->oobretlen = 8;
} else {
memcpy(docg3->oob_write_buf, ops->oobbuf, DOC_LAYOUT_OOB_SIZE);
ops->oobretlen = DOC_LAYOUT_OOB_SIZE;
}
return 0;
}
/**
* doc_write_oob - Write out of band bytes to flash
* @mtd: the device
* @ofs: the offset from first block and first page, in bytes, aligned on page
* size
* @ops: the mtd oob structure
*
* Either write OOB data into a temporary buffer, for the subsequent write
* page. The provided OOB should be 16 bytes long. If a data buffer is provided
* as well, issue the page write.
* Or provide data without OOB, and then a all zeroed OOB will be used (ECC will
* still be filled in if asked for).
*
* Returns 0 is successfull, EINVAL if length is not 14 bytes
*/
static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
struct mtd_oob_ops *ops)
{
struct docg3 *docg3 = mtd->priv;
int block0, block1, page, ret, pofs = 0, autoecc, oobdelta;
u8 *oobbuf = ops->oobbuf;
u8 *buf = ops->datbuf;
size_t len, ooblen;
u8 oob[DOC_LAYOUT_OOB_SIZE];
if (buf)
len = ops->len;
else
len = 0;
if (oobbuf)
ooblen = ops->ooblen;
else
ooblen = 0;
if (oobbuf && ops->mode == MTD_OPS_PLACE_OOB)
oobbuf += ops->ooboffs;
doc_dbg("doc_write_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n",
ofs, ops->mode, buf, len, oobbuf, ooblen);
switch (ops->mode) {
case MTD_OPS_PLACE_OOB:
case MTD_OPS_RAW:
oobdelta = mtd->oobsize;
break;
case MTD_OPS_AUTO_OOB:
oobdelta = mtd->ecclayout->oobavail;
break;
default:
oobdelta = 0;
}
if ((len % DOC_LAYOUT_PAGE_SIZE) || (ooblen % oobdelta) ||
(ofs % DOC_LAYOUT_PAGE_SIZE))
return -EINVAL;
if (len && ooblen &&
(len / DOC_LAYOUT_PAGE_SIZE) != (ooblen / oobdelta))
return -EINVAL;
ret = -EINVAL;
calc_block_sector(ofs + len, &block0, &block1, &page, &pofs);
if (block1 > docg3->max_block)
goto err;
ops->oobretlen = 0;
ops->retlen = 0;
ret = 0;
if (len == 0 && ooblen == 0)
return -EINVAL;
if (len == 0 && ooblen > 0)
return doc_backup_oob(docg3, ofs, ops);
autoecc = doc_guess_autoecc(ops);
if (autoecc < 0)
return autoecc;
while (!ret && len > 0) {
memset(oob, 0, sizeof(oob));
if (ofs == docg3->oob_write_ofs)
memcpy(oob, docg3->oob_write_buf, DOC_LAYOUT_OOB_SIZE);
else if (ooblen > 0 && ops->mode == MTD_OPS_AUTO_OOB)
doc_fill_autooob(oob, oobbuf);
else if (ooblen > 0)
memcpy(oob, oobbuf, DOC_LAYOUT_OOB_SIZE);
ret = doc_write_page(docg3, ofs, buf, oob, autoecc);
ofs += DOC_LAYOUT_PAGE_SIZE;
len -= DOC_LAYOUT_PAGE_SIZE;
buf += DOC_LAYOUT_PAGE_SIZE;
if (ooblen) {
oobbuf += oobdelta;
ooblen -= oobdelta;
ops->oobretlen += oobdelta;
}
ops->retlen += DOC_LAYOUT_PAGE_SIZE;
}
err:
doc_set_device_id(docg3, 0);
return ret;
}
/**
* doc_write - Write a buffer to the chip
* @mtd: the device
* @to: the offset from first block and first page, in bytes, aligned on page
* size
* @len: the number of bytes to write (must be a full page size, ie. 512)
* @retlen: the number of bytes actually written (0 or 512)
* @buf: the buffer to get bytes from
*
* Writes data to the chip.
*
* Returns 0 if write successful, -EIO if write error
*/
static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
struct docg3 *docg3 = mtd->priv;
int ret;
struct mtd_oob_ops ops;
doc_dbg("doc_write(to=%lld, len=%zu)\n", to, len);
ops.datbuf = (char *)buf;
ops.len = len;
ops.mode = MTD_OPS_PLACE_OOB;
ops.oobbuf = NULL;
ops.ooblen = 0;
ops.ooboffs = 0;
ret = doc_write_oob(mtd, to, &ops);
*retlen = ops.retlen;
return ret;
}
/*
* Debug sysfs entries
*/
@ -1052,6 +1580,7 @@ static struct mtd_info *doc_probe_device(void __iomem *base, int floor,
doc_set_driver_info(chip_id, mtd);
doc_hamming_ecc_init(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ);
doc_reload_bbt(docg3);
return mtd;