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linux_dsm_epyc7002/drivers/mtd/devices/docg3.c
Robert Jarzmik 52c2d9aad4 mtd: docg3 fix in-middle of blocks reads 
Corner case reads do not work, and return false data and
ECC. This case is typically seen in a ubifs usage, with a
read of type:
 - docg3 docg3: doc_read_oob(from=14882415, mode=1,
 data=(c30eca40:12), oob=(  (null):0))

This results in the following reads:
 - docg3 docg3: doc_read_data_area(buf=  (null), len=111)
 - docg3 docg3: doc_read_data_area(buf=c30eca40, len=12)
 - docg3 docg3: doc_read_data_area(buf=  (null), len=389)
 - docg3 docg3: doc_read_data_area(buf=  (null), len=0)
 - docg3 docg3: doc_read_data_area(buf=  (null), len=16)

If we suppose that the pages content is :
 - bytes 0 .. 111   : 0x0a
 - bytes 112 .. 255 : 0x0f
Then the returned bytes will be :
 - 111 times 0x0a (correct)
 - 0x0a 2 times and 0x0f 10 times (incorrect, should be
 0x0a,0x0f)
 - 0x0f 389 times (correct)
 - nothing
 - correct OOB

The reason seams that the first 111 bytes read ends between
the 2 docg3 planes, and that the first following read (in
the 12 bytes sequence, read of 16 bit word) returns the byte
of the rightmost plane duplicated in high and lower byte of
the word.

Fix this behaviour by ensuring that if the previous read
ended up in-between the 2 planes, there will be a first 1
byte read to get back to the beginning of leftmost plane.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2012-05-29 11:14:51 +03:00

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/*
* Handles the M-Systems DiskOnChip G3 chip
*
* Copyright (C) 2011 Robert Jarzmik
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/bitmap.h>
#include <linux/bitrev.h>
#include <linux/bch.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#define CREATE_TRACE_POINTS
#include "docg3.h"
/*
* This driver handles the DiskOnChip G3 flash memory.
*
* As no specification is available from M-Systems/Sandisk, this drivers lacks
* several functions available on the chip, as :
* - IPL write
*
* The bus data width (8bits versus 16bits) is not handled (if_cfg flag), and
* the driver assumes a 16bits data bus.
*
* DocG3 relies on 2 ECC algorithms, which are handled in hardware :
* - a 1 byte Hamming code stored in the OOB for each page
* - a 7 bytes BCH code stored in the OOB for each page
* The BCH ECC is :
* - BCH is in GF(2^14)
* - BCH is over data of 520 bytes (512 page + 7 page_info bytes
* + 1 hamming byte)
* - BCH can correct up to 4 bits (t = 4)
* - BCH syndroms are calculated in hardware, and checked in hardware as well
*
*/
static unsigned int reliable_mode;
module_param(reliable_mode, uint, 0);
MODULE_PARM_DESC(reliable_mode, "Set the docg3 mode (0=normal MLC, 1=fast, "
"2=reliable) : MLC normal operations are in normal mode");
/**
* struct docg3_oobinfo - DiskOnChip G3 OOB layout
* @eccbytes: 8 bytes are used (1 for Hamming ECC, 7 for BCH ECC)
* @eccpos: ecc positions (byte 7 is Hamming ECC, byte 8-14 are BCH ECC)
* @oobfree: free pageinfo bytes (byte 0 until byte 6, byte 15
* @oobavail: 8 available bytes remaining after ECC toll
*/
static struct nand_ecclayout docg3_oobinfo = {
.eccbytes = 8,
.eccpos = {7, 8, 9, 10, 11, 12, 13, 14},
.oobfree = {{0, 7}, {15, 1} },
.oobavail = 8,
};
static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
{
u8 val = readb(docg3->cascade->base + reg);
trace_docg3_io(0, 8, reg, (int)val);
return val;
}
static inline u16 doc_readw(struct docg3 *docg3, u16 reg)
{
u16 val = readw(docg3->cascade->base + reg);
trace_docg3_io(0, 16, reg, (int)val);
return val;
}
static inline void doc_writeb(struct docg3 *docg3, u8 val, u16 reg)
{
writeb(val, docg3->cascade->base + reg);
trace_docg3_io(1, 8, reg, val);
}
static inline void doc_writew(struct docg3 *docg3, u16 val, u16 reg)
{
writew(val, docg3->cascade->base + reg);
trace_docg3_io(1, 16, reg, val);
}
static inline void doc_flash_command(struct docg3 *docg3, u8 cmd)
{
doc_writeb(docg3, cmd, DOC_FLASHCOMMAND);
}
static inline void doc_flash_sequence(struct docg3 *docg3, u8 seq)
{
doc_writeb(docg3, seq, DOC_FLASHSEQUENCE);
}
static inline void doc_flash_address(struct docg3 *docg3, u8 addr)
{
doc_writeb(docg3, addr, DOC_FLASHADDRESS);
}
static char const *part_probes[] = { "cmdlinepart", "saftlpart", NULL };
static int doc_register_readb(struct docg3 *docg3, int reg)
{
u8 val;
doc_writew(docg3, reg, DOC_READADDRESS);
val = doc_readb(docg3, reg);
doc_vdbg("Read register %04x : %02x\n", reg, val);
return val;
}
static int doc_register_readw(struct docg3 *docg3, int reg)
{
u16 val;
doc_writew(docg3, reg, DOC_READADDRESS);
val = doc_readw(docg3, reg);
doc_vdbg("Read register %04x : %04x\n", reg, val);
return val;
}
/**
* doc_delay - delay docg3 operations
* @docg3: the device
* @nbNOPs: the number of NOPs to issue
*
* As no specification is available, the right timings between chip commands are
* unknown. The only available piece of information are the observed nops on a
* working docg3 chip.
* Therefore, doc_delay relies on a busy loop of NOPs, instead of scheduler
* friendlier msleep() functions or blocking mdelay().
*/
static void doc_delay(struct docg3 *docg3, int nbNOPs)
{
int i;
doc_vdbg("NOP x %d\n", nbNOPs);
for (i = 0; i < nbNOPs; i++)
doc_writeb(docg3, 0, DOC_NOP);
}
static int is_prot_seq_error(struct docg3 *docg3)
{
int ctrl;
ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
return ctrl & (DOC_CTRL_PROTECTION_ERROR | DOC_CTRL_SEQUENCE_ERROR);
}
static int doc_is_ready(struct docg3 *docg3)
{
int ctrl;
ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
return ctrl & DOC_CTRL_FLASHREADY;
}
static int doc_wait_ready(struct docg3 *docg3)
{
int maxWaitCycles = 100;
do {
doc_delay(docg3, 4);
cpu_relax();
} while (!doc_is_ready(docg3) && maxWaitCycles--);
doc_delay(docg3, 2);
if (maxWaitCycles > 0)
return 0;
else
return -EIO;
}
static int doc_reset_seq(struct docg3 *docg3)
{
int ret;
doc_writeb(docg3, 0x10, DOC_FLASHCONTROL);
doc_flash_sequence(docg3, DOC_SEQ_RESET);
doc_flash_command(docg3, DOC_CMD_RESET);
doc_delay(docg3, 2);
ret = doc_wait_ready(docg3);
doc_dbg("doc_reset_seq() -> isReady=%s\n", ret ? "false" : "true");
return ret;
}
/**
* doc_read_data_area - Read data from data area
* @docg3: the device
* @buf: the buffer to fill in (might be NULL is dummy reads)
* @len: the length to read
* @first: first time read, DOC_READADDRESS should be set
*
* Reads bytes from flash data. Handles the single byte / even bytes reads.
*/
static void doc_read_data_area(struct docg3 *docg3, void *buf, int len,
int first)
{
int i, cdr, len4;
u16 data16, *dst16;
u8 data8, *dst8;
doc_dbg("doc_read_data_area(buf=%p, len=%d)\n", buf, len);
cdr = len & 0x1;
len4 = len - cdr;
if (first)
doc_writew(docg3, DOC_IOSPACE_DATA, DOC_READADDRESS);
dst16 = buf;
for (i = 0; i < len4; i += 2) {
data16 = doc_readw(docg3, DOC_IOSPACE_DATA);
if (dst16) {
*dst16 = data16;
dst16++;
}
}
if (cdr) {
doc_writew(docg3, DOC_IOSPACE_DATA | DOC_READADDR_ONE_BYTE,
DOC_READADDRESS);
doc_delay(docg3, 1);
dst8 = (u8 *)dst16;
for (i = 0; i < cdr; i++) {
data8 = doc_readb(docg3, DOC_IOSPACE_DATA);
if (dst8) {
*dst8 = data8;
dst8++;
}
}
}
}
/**
* 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 normal or reliable data mode
* @docg3: the device
*
* The reliable data mode is a bit slower than the fast mode, but less errors
* occur. Entering the reliable mode cannot be done without entering the fast
* mode first.
*
* In reliable mode, pages 2*n and 2*n+1 are clones. Writing to page 0 of blocks
* (4,5) make the hardware write also to page 1 of blocks blocks(4,5). Reading
* from page 0 of blocks (4,5) or from page 1 of blocks (4,5) gives the same
* result, which is a logical and between bytes from page 0 and page 1 (which is
* consistent with the fact that writing to a page is _clearing_ bits of that
* page).
*/
static void doc_set_reliable_mode(struct docg3 *docg3)
{
static char *strmode[] = { "normal", "fast", "reliable", "invalid" };
doc_dbg("doc_set_reliable_mode(%s)\n", strmode[docg3->reliable]);
switch (docg3->reliable) {
case 0:
break;
case 1:
doc_flash_sequence(docg3, DOC_SEQ_SET_FASTMODE);
doc_flash_command(docg3, DOC_CMD_FAST_MODE);
break;
case 2:
doc_flash_sequence(docg3, DOC_SEQ_SET_RELIABLEMODE);
doc_flash_command(docg3, DOC_CMD_FAST_MODE);
doc_flash_command(docg3, DOC_CMD_RELIABLE_MODE);
break;
default:
doc_err("doc_set_reliable_mode(): invalid mode\n");
break;
}
doc_delay(docg3, 2);
}
/**
* doc_set_asic_mode - Set the ASIC mode
* @docg3: the device
* @mode: the mode
*
* The ASIC can work in 3 modes :
* - RESET: all registers are zeroed
* - NORMAL: receives and handles commands
* - POWERDOWN: minimal poweruse, flash parts shut off
*/
static void doc_set_asic_mode(struct docg3 *docg3, u8 mode)
{
int i;
for (i = 0; i < 12; i++)
doc_readb(docg3, DOC_IOSPACE_IPL);
mode |= DOC_ASICMODE_MDWREN;
doc_dbg("doc_set_asic_mode(%02x)\n", mode);
doc_writeb(docg3, mode, DOC_ASICMODE);
doc_writeb(docg3, ~mode, DOC_ASICMODECONFIRM);
doc_delay(docg3, 1);
}
/**
* doc_set_device_id - Sets the devices id for cascaded G3 chips
* @docg3: the device
* @id: the chip to select (amongst 0, 1, 2, 3)
*
* There can be 4 cascaded G3 chips. This function selects the one which will
* should be the active one.
*/
static void doc_set_device_id(struct docg3 *docg3, int id)
{
u8 ctrl;
doc_dbg("doc_set_device_id(%d)\n", id);
doc_writeb(docg3, id, DOC_DEVICESELECT);
ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
ctrl &= ~DOC_CTRL_VIOLATION;
ctrl |= DOC_CTRL_CE;
doc_writeb(docg3, ctrl, DOC_FLASHCONTROL);
}
/**
* doc_set_extra_page_mode - Change flash page layout
* @docg3: the device
*
* Normally, the flash page is split into the data (512 bytes) and the out of
* band data (16 bytes). For each, 4 more bytes can be accessed, where the wear
* leveling counters are stored. To access this last area of 4 bytes, a special
* mode must be input to the flash ASIC.
*
* Returns 0 if no error occured, -EIO else.
*/
static int doc_set_extra_page_mode(struct docg3 *docg3)
{
int fctrl;
doc_dbg("doc_set_extra_page_mode()\n");
doc_flash_sequence(docg3, DOC_SEQ_PAGE_SIZE_532);
doc_flash_command(docg3, DOC_CMD_PAGE_SIZE_532);
doc_delay(docg3, 2);
fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
if (fctrl & (DOC_CTRL_PROTECTION_ERROR | DOC_CTRL_SEQUENCE_ERROR))
return -EIO;
else
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
* @block0: the first plane block index
* @block1: the second plane block index
* @page: the page index within the block
* @wear: if true, read will occur on the 4 extra bytes of the wear area
* @ofs: offset in page to read
*
* 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_read_seek(struct docg3 *docg3, int block0, int block1, int page,
int wear, int ofs)
{
int sector, ret = 0;
doc_dbg("doc_seek(blocks=(%d,%d), page=%d, ofs=%d, wear=%d)\n",
block0, block1, page, ofs, wear);
if (!wear && (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_set_reliable_mode(docg3);
if (wear)
ret = doc_set_extra_page_mode(docg3);
if (ret)
goto out;
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_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);
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
* @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 hardware ECC (on 7 bytes).
*
* Return 0 if succeeded, -EIO on error
*/
static int doc_read_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_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 hardware ECC (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_WRITE_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_ecc_bch_fix_data - Fix if need be read data from flash
* @docg3: the device
* @buf: the buffer of read data (512 + 7 + 1 bytes)
* @hwecc: the hardware calculated ECC.
* It's in fact recv_ecc ^ calc_ecc, where recv_ecc was read from OOB
* area data, and calc_ecc the ECC calculated by the hardware generator.
*
* Checks if the received data matches the ECC, and if an error is detected,
* tries to fix the bit flips (at most 4) in the buffer buf. As the docg3
* understands the (data, ecc, syndroms) in an inverted order in comparison to
* the BCH library, the function reverses the order of bits (ie. bit7 and bit0,
* bit6 and bit 1, ...) for all ECC data.
*
* The hardware ecc unit produces oob_ecc ^ calc_ecc. The kernel's bch
* algorithm is used to decode this. However the hw operates on page
* data in a bit order that is the reverse of that of the bch alg,
* requiring that the bits be reversed on the result. Thanks to Ivan
* Djelic for his analysis.
*
* Returns number of fixed bits (0, 1, 2, 3, 4) or -EBADMSG if too many bit
* errors were detected and cannot be fixed.
*/
static int doc_ecc_bch_fix_data(struct docg3 *docg3, void *buf, u8 *hwecc)
{
u8 ecc[DOC_ECC_BCH_SIZE];
int errorpos[DOC_ECC_BCH_T], i, numerrs;
for (i = 0; i < DOC_ECC_BCH_SIZE; i++)
ecc[i] = bitrev8(hwecc[i]);
numerrs = decode_bch(docg3->cascade->bch, NULL,
DOC_ECC_BCH_COVERED_BYTES,
NULL, ecc, NULL, errorpos);
BUG_ON(numerrs == -EINVAL);
if (numerrs < 0)
goto out;
for (i = 0; i < numerrs; i++)
errorpos[i] = (errorpos[i] & ~7) | (7 - (errorpos[i] & 7));
for (i = 0; i < numerrs; i++)
if (errorpos[i] < DOC_ECC_BCH_COVERED_BYTES*8)
/* error is located in data, correct it */
change_bit(errorpos[i], buf);
out:
doc_dbg("doc_ecc_bch_fix_data: flipped %d bits\n", numerrs);
return numerrs;
}
/**
* doc_read_page_prepare - Prepares reading data from a flash page
* @docg3: the device
* @block0: the first plane block index on flash memory
* @block1: the second plane block index on flash memory
* @page: the page index in the block
* @offset: the offset in the page (must be a multiple of 4)
*
* Prepares the page to be read in the flash memory :
* - tell ASIC to map the flash pages
* - tell ASIC to be in read mode
*
* After a call to this method, a call to doc_read_page_finish is mandatory,
* to end the read cycle of the flash.
*
* Read data from a flash page. The length to be read must be between 0 and
* (page_size + oob_size + wear_size), ie. 532, and a multiple of 4 (because
* the extra bytes reading is not implemented).
*
* As pages are grouped by 2 (in 2 planes), reading from a page must be done
* in two steps:
* - one read of 512 bytes at offset 0
* - one read of 512 bytes at offset 512 + 16
*
* Returns 0 if successful, -EIO if a read error occured.
*/
static int doc_read_page_prepare(struct docg3 *docg3, int block0, int block1,
int page, int offset)
{
int wear_area = 0, ret = 0;
doc_dbg("doc_read_page_prepare(blocks=(%d,%d), page=%d, ofsInPage=%d)\n",
block0, block1, page, offset);
if (offset >= DOC_LAYOUT_WEAR_OFFSET)
wear_area = 1;
if (!wear_area && offset > (DOC_LAYOUT_PAGE_OOB_SIZE * 2))
return -EINVAL;
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_read_seek(docg3, block0, block1, page, wear_area, offset);
if (ret)
goto err;
doc_flash_command(docg3, DOC_CMD_READ_ALL_PLANES);
doc_delay(docg3, 2);
doc_wait_ready(docg3);
doc_flash_command(docg3, DOC_CMD_SET_ADDR_READ);
doc_delay(docg3, 1);
if (offset >= DOC_LAYOUT_PAGE_SIZE * 2)
offset -= 2 * DOC_LAYOUT_PAGE_SIZE;
doc_flash_address(docg3, offset >> 2);
doc_delay(docg3, 1);
doc_wait_ready(docg3);
doc_flash_command(docg3, DOC_CMD_READ_FLASH);
return 0;
err:
doc_writeb(docg3, 0, DOC_DATAEND);
doc_delay(docg3, 2);
return -EIO;
}
/**
* doc_read_page_getbytes - Reads bytes from a prepared page
* @docg3: the device
* @len: the number of bytes to be read (must be a multiple of 4)
* @buf: the buffer to be filled in (or NULL is forget bytes)
* @first: 1 if first time read, DOC_READADDRESS should be set
* @last_odd: 1 if last read ended up on an odd byte
*
* Reads bytes from a prepared page. There is a trickery here : if the last read
* ended up on an odd offset in the 1024 bytes double page, ie. between the 2
* planes, the first byte must be read apart. If a word (16bit) read was used,
* the read would return the byte of plane 2 as low *and* high endian, which
* will mess the read.
*
*/
static int doc_read_page_getbytes(struct docg3 *docg3, int len, u_char *buf,
int first, int last_odd)
{
if (last_odd && len > 0) {
doc_read_data_area(docg3, buf, 1, first);
doc_read_data_area(docg3, buf ? buf + 1 : buf, len - 1, 0);
} else {
doc_read_data_area(docg3, buf, len, first);
}
doc_delay(docg3, 2);
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_bch_hw_ecc - Get hardware calculated BCH ECC
* @docg3: the device
* @hwecc: the array of 7 integers where the hardware ecc will be stored
*/
static void doc_get_bch_hw_ecc(struct docg3 *docg3, u8 *hwecc)
{
int i;
for (i = 0; i < DOC_ECC_BCH_SIZE; i++)
hwecc[i] = doc_register_readb(docg3, DOC_BCH_HW_ECC(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
*
* As a side effect, resets the chip selector to 0. This ensures that after each
* read operation, the floor 0 is selected. Therefore, if the systems halts, the
* reboot will boot on floor 0, where the IPL is.
*/
static void doc_read_page_finish(struct docg3 *docg3)
{
doc_page_finish(docg3);
doc_set_device_id(docg3, 0);
}
/**
* calc_block_sector - Calculate blocks, pages and ofs.
* @from: offset in flash
* @block0: first plane block index calculated
* @block1: second plane block index calculated
* @page: page calculated
* @ofs: offset in page
* @reliable: 0 if docg3 in normal mode, 1 if docg3 in fast mode, 2 if docg3 in
* reliable mode.
*
* The calculation is based on the reliable/normal mode. In normal mode, the 64
* pages of a block are available. In reliable mode, as pages 2*n and 2*n+1 are
* clones, only 32 pages per block are available.
*/
static void calc_block_sector(loff_t from, int *block0, int *block1, int *page,
int *ofs, int reliable)
{
uint sector, pages_biblock;
pages_biblock = DOC_LAYOUT_PAGES_PER_BLOCK * DOC_LAYOUT_NBPLANES;
if (reliable == 1 || reliable == 2)
pages_biblock /= 2;
sector = from / DOC_LAYOUT_PAGE_SIZE;
*block0 = sector / pages_biblock * DOC_LAYOUT_NBPLANES;
*block1 = *block0 + 1;
*page = sector % pages_biblock;
*page /= DOC_LAYOUT_NBPLANES;
if (reliable == 1 || reliable == 2)
*page *= 2;
if (sector % 2)
*ofs = DOC_LAYOUT_PAGE_OOB_SIZE;
else
*ofs = 0;
}
/**
* doc_read_oob - Read out of band bytes from flash
* @mtd: the device
* @from: the offset from first block and first page, in bytes, aligned on page
* size
* @ops: the mtd oob structure
*
* Reads flash memory OOB area of pages.
*
* Returns 0 if read successfull, of -EIO, -EINVAL if an error occured
*/
static int doc_read_oob(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
{
struct docg3 *docg3 = mtd->priv;
int block0, block1, page, ret, skip, ofs = 0;
u8 *oobbuf = ops->oobbuf;
u8 *buf = ops->datbuf;
size_t len, ooblen, nbdata, nboob;
u8 hwecc[DOC_ECC_BCH_SIZE], eccconf1;
int max_bitflips = 0;
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_read_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n",
from, ops->mode, buf, len, oobbuf, ooblen);
if (ooblen % DOC_LAYOUT_OOB_SIZE)
return -EINVAL;
if (from + len > mtd->size)
return -EINVAL;
ops->oobretlen = 0;
ops->retlen = 0;
ret = 0;
skip = from % DOC_LAYOUT_PAGE_SIZE;
mutex_lock(&docg3->cascade->lock);
while (ret >= 0 && (len > 0 || ooblen > 0)) {
calc_block_sector(from - skip, &block0, &block1, &page, &ofs,
docg3->reliable);
nbdata = min_t(size_t, len, DOC_LAYOUT_PAGE_SIZE - skip);
nboob = min_t(size_t, ooblen, (size_t)DOC_LAYOUT_OOB_SIZE);
ret = doc_read_page_prepare(docg3, block0, block1, page, ofs);
if (ret < 0)
goto out;
ret = doc_read_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES);
if (ret < 0)
goto err_in_read;
ret = doc_read_page_getbytes(docg3, skip, NULL, 1, 0);
if (ret < skip)
goto err_in_read;
ret = doc_read_page_getbytes(docg3, nbdata, buf, 0, skip % 2);
if (ret < nbdata)
goto err_in_read;
doc_read_page_getbytes(docg3,
DOC_LAYOUT_PAGE_SIZE - nbdata - skip,
NULL, 0, (skip + nbdata) % 2);
ret = doc_read_page_getbytes(docg3, nboob, oobbuf, 0, 0);
if (ret < nboob)
goto err_in_read;
doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE - nboob,
NULL, 0, nboob % 2);
doc_get_bch_hw_ecc(docg3, hwecc);
eccconf1 = doc_register_readb(docg3, DOC_ECCCONF1);
if (nboob >= DOC_LAYOUT_OOB_SIZE) {
doc_dbg("OOB - INFO: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
oobbuf[0], oobbuf[1], oobbuf[2], oobbuf[3],
oobbuf[4], oobbuf[5], oobbuf[6]);
doc_dbg("OOB - HAMMING: %02x\n", oobbuf[7]);
doc_dbg("OOB - BCH_ECC: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
oobbuf[8], oobbuf[9], oobbuf[10], oobbuf[11],
oobbuf[12], oobbuf[13], oobbuf[14]);
doc_dbg("OOB - UNUSED: %02x\n", oobbuf[15]);
}
doc_dbg("ECC checks: ECCConf1=%x\n", eccconf1);
doc_dbg("ECC HW_ECC: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
hwecc[0], hwecc[1], hwecc[2], hwecc[3], hwecc[4],
hwecc[5], hwecc[6]);
ret = -EIO;
if (is_prot_seq_error(docg3))
goto err_in_read;
ret = 0;
if ((block0 >= DOC_LAYOUT_BLOCK_FIRST_DATA) &&
(eccconf1 & DOC_ECCCONF1_BCH_SYNDROM_ERR) &&
(eccconf1 & DOC_ECCCONF1_PAGE_IS_WRITTEN) &&
(ops->mode != MTD_OPS_RAW) &&
(nbdata == DOC_LAYOUT_PAGE_SIZE)) {
ret = doc_ecc_bch_fix_data(docg3, buf, hwecc);
if (ret < 0) {
mtd->ecc_stats.failed++;
ret = -EBADMSG;
}
if (ret > 0) {
mtd->ecc_stats.corrected += ret;
max_bitflips = max(max_bitflips, ret);
ret = max_bitflips;
}
}
doc_read_page_finish(docg3);
ops->retlen += nbdata;
ops->oobretlen += nboob;
buf += nbdata;
oobbuf += nboob;
len -= nbdata;
ooblen -= nboob;
from += DOC_LAYOUT_PAGE_SIZE;
skip = 0;
}
out:
mutex_unlock(&docg3->cascade->lock);
return ret;
err_in_read:
doc_read_page_finish(docg3);
goto out;
}
/**
* doc_read - Read bytes from flash
* @mtd: the device
* @from: the offset from first block and first page, in bytes, aligned on page
* size
* @len: the number of bytes to read (must be a multiple of 4)
* @retlen: the number of bytes actually read
* @buf: the filled in buffer
*
* Reads flash memory pages. This function does not read the OOB chunk, but only
* the page data.
*
* Returns 0 if read successfull, of -EIO, -EINVAL if an error occured
*/
static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct mtd_oob_ops ops;
size_t ret;
memset(&ops, 0, sizeof(ops));
ops.datbuf = buf;
ops.len = len;
ops.mode = MTD_OPS_AUTO_OOB;
ret = doc_read_oob(mtd, from, &ops);
*retlen = ops.retlen;
return ret;
}
static int doc_reload_bbt(struct docg3 *docg3)
{
int block = DOC_LAYOUT_BLOCK_BBT;
int ret = 0, nbpages, page;
u_char *buf = docg3->bbt;
nbpages = DIV_ROUND_UP(docg3->max_block + 1, 8 * DOC_LAYOUT_PAGE_SIZE);
for (page = 0; !ret && (page < nbpages); page++) {
ret = doc_read_page_prepare(docg3, block, block + 1,
page + DOC_LAYOUT_PAGE_BBT, 0);
if (!ret)
ret = doc_read_page_ecc_init(docg3,
DOC_LAYOUT_PAGE_SIZE);
if (!ret)
doc_read_page_getbytes(docg3, DOC_LAYOUT_PAGE_SIZE,
buf, 1, 0);
buf += DOC_LAYOUT_PAGE_SIZE;
}
doc_read_page_finish(docg3);
return ret;
}
/**
* doc_block_isbad - Checks whether a block is good or not
* @mtd: the device
* @from: the offset to find the correct block
*
* Returns 1 if block is bad, 0 if block is good
*/
static int doc_block_isbad(struct mtd_info *mtd, loff_t from)
{
struct docg3 *docg3 = mtd->priv;
int block0, block1, page, ofs, is_good;
calc_block_sector(from, &block0, &block1, &page, &ofs,
docg3->reliable);
doc_dbg("doc_block_isbad(from=%lld) => block=(%d,%d), page=%d, ofs=%d\n",
from, block0, block1, page, ofs);
if (block0 < DOC_LAYOUT_BLOCK_FIRST_DATA)
return 0;
if (block1 > docg3->max_block)
return -EINVAL;
is_good = docg3->bbt[block0 >> 3] & (1 << (block0 & 0x7));
return !is_good;
}
#if 0
/**
* doc_get_erase_count - Get block erase count
* @docg3: the device
* @from: the offset in which the block is.
*
* Get the number of times a block was erased. The number is the maximum of
* erase times between first and second plane (which should be equal normally).
*
* Returns The number of erases, or -EINVAL or -EIO on error.
*/
static int doc_get_erase_count(struct docg3 *docg3, loff_t from)
{
u8 buf[DOC_LAYOUT_WEAR_SIZE];
int ret, plane1_erase_count, plane2_erase_count;
int block0, block1, page, ofs;
doc_dbg("doc_get_erase_count(from=%lld, buf=%p)\n", from, buf);
if (from % DOC_LAYOUT_PAGE_SIZE)
return -EINVAL;
calc_block_sector(from, &block0, &block1, &page, &ofs, docg3->reliable);
if (block1 > docg3->max_block)
return -EINVAL;
ret = doc_reset_seq(docg3);
if (!ret)
ret = doc_read_page_prepare(docg3, block0, block1, page,
ofs + DOC_LAYOUT_WEAR_OFFSET, 0);
if (!ret)
ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_WEAR_SIZE,
buf, 1, 0);
doc_read_page_finish(docg3);
if (ret || (buf[0] != DOC_ERASE_MARK) || (buf[2] != DOC_ERASE_MARK))
return -EIO;
plane1_erase_count = (u8)(~buf[1]) | ((u8)(~buf[4]) << 8)
| ((u8)(~buf[5]) << 16);
plane2_erase_count = (u8)(~buf[3]) | ((u8)(~buf[6]) << 8)
| ((u8)(~buf[7]) << 16);
return max(plane1_erase_count, plane2_erase_count);
}
#endif
/**
* 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 i, status, ret = 0;
for (i = 0; !doc_is_ready(docg3) && i < 5; i++)
msleep(20);
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_erase_block - Erase a couple of blocks
* @docg3: the device
* @block0: the first block to erase (leftmost plane)
* @block1: the second block to erase (rightmost plane)
*
* Erase both blocks, and return operation status
*
* Returns 0 if erase successful, -EIO if erase issue, -ETIMEOUT if chip not
* ready for too long
*/
static int doc_erase_block(struct docg3 *docg3, int block0, int block1)
{
int ret, sector;
doc_dbg("doc_erase_block(blocks=(%d,%d))\n", block0, block1);
ret = doc_reset_seq(docg3);
if (ret)
return -EIO;
doc_set_reliable_mode(docg3);
doc_flash_sequence(docg3, DOC_SEQ_ERASE);
sector = block0 << DOC_ADDR_BLOCK_SHIFT;
doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
doc_setup_addr_sector(docg3, sector);
sector = block1 << DOC_ADDR_BLOCK_SHIFT;
doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
doc_setup_addr_sector(docg3, sector);
doc_delay(docg3, 1);
doc_flash_command(docg3, DOC_CMD_ERASECYCLE2);
doc_delay(docg3, 2);
if (is_prot_seq_error(docg3)) {
doc_err("Erase blocks %d,%d error\n", block0, block1);
return -EIO;
}
return doc_write_erase_wait_status(docg3);
}
/**
* doc_erase - Erase a portion of the chip
* @mtd: the device
* @info: the erase info
*
* Erase a bunch of contiguous blocks, by pairs, as a "mtd" page of 1024 is
* split into 2 pages of 512 bytes on 2 contiguous blocks.
*
* Returns 0 if erase successful, -EINVAL if adressing error, -EIO if erase
* issue
*/
static int doc_erase(struct mtd_info *mtd, struct erase_info *info)
{
struct docg3 *docg3 = mtd->priv;
uint64_t len;
int block0, block1, page, ret, ofs = 0;
doc_dbg("doc_erase(from=%lld, len=%lld\n", info->addr, info->len);
info->state = MTD_ERASE_PENDING;
calc_block_sector(info->addr + info->len, &block0, &block1, &page,
&ofs, docg3->reliable);
ret = -EINVAL;
if (info->addr + info->len > mtd->size || page || ofs)
goto reset_err;
ret = 0;
calc_block_sector(info->addr, &block0, &block1, &page, &ofs,
docg3->reliable);
mutex_lock(&docg3->cascade->lock);
doc_set_device_id(docg3, docg3->device_id);
doc_set_reliable_mode(docg3);
for (len = info->len; !ret && len > 0; len -= mtd->erasesize) {
info->state = MTD_ERASING;
ret = doc_erase_block(docg3, block0, block1);
block0 += 2;
block1 += 2;
}
mutex_unlock(&docg3->cascade->lock);
if (ret)
goto reset_err;
info->state = MTD_ERASE_DONE;
return 0;
reset_err:
info->state = MTD_ERASE_FAILED;
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 hwecc[DOC_ECC_BCH_SIZE], hamming;
doc_dbg("doc_write_page(to=%lld)\n", to);
calc_block_sector(to, &block0, &block1, &page, &ofs, docg3->reliable);
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_TOTAL_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_bch_hw_ecc(docg3, hwecc);
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_BCH_SZ, hwecc);
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 ret, 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;
if (ofs + len > mtd->size)
return -EINVAL;
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;
mutex_lock(&docg3->cascade->lock);
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;
}
doc_set_device_id(docg3, 0);
mutex_unlock(&docg3->cascade->lock);
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;
}
static struct docg3 *sysfs_dev2docg3(struct device *dev,
struct device_attribute *attr)
{
int floor;
struct platform_device *pdev = to_platform_device(dev);
struct mtd_info **docg3_floors = platform_get_drvdata(pdev);
floor = attr->attr.name[1] - '0';
if (floor < 0 || floor >= DOC_MAX_NBFLOORS)
return NULL;
else
return docg3_floors[floor]->priv;
}
static ssize_t dps0_is_key_locked(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
int dps0;
mutex_lock(&docg3->cascade->lock);
doc_set_device_id(docg3, docg3->device_id);
dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS);
doc_set_device_id(docg3, 0);
mutex_unlock(&docg3->cascade->lock);
return sprintf(buf, "%d\n", !(dps0 & DOC_DPS_KEY_OK));
}
static ssize_t dps1_is_key_locked(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
int dps1;
mutex_lock(&docg3->cascade->lock);
doc_set_device_id(docg3, docg3->device_id);
dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS);
doc_set_device_id(docg3, 0);
mutex_unlock(&docg3->cascade->lock);
return sprintf(buf, "%d\n", !(dps1 & DOC_DPS_KEY_OK));
}
static ssize_t dps0_insert_key(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
int i;
if (count != DOC_LAYOUT_DPS_KEY_LENGTH)
return -EINVAL;
mutex_lock(&docg3->cascade->lock);
doc_set_device_id(docg3, docg3->device_id);
for (i = 0; i < DOC_LAYOUT_DPS_KEY_LENGTH; i++)
doc_writeb(docg3, buf[i], DOC_DPS0_KEY);
doc_set_device_id(docg3, 0);
mutex_unlock(&docg3->cascade->lock);
return count;
}
static ssize_t dps1_insert_key(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
int i;
if (count != DOC_LAYOUT_DPS_KEY_LENGTH)
return -EINVAL;
mutex_lock(&docg3->cascade->lock);
doc_set_device_id(docg3, docg3->device_id);
for (i = 0; i < DOC_LAYOUT_DPS_KEY_LENGTH; i++)
doc_writeb(docg3, buf[i], DOC_DPS1_KEY);
doc_set_device_id(docg3, 0);
mutex_unlock(&docg3->cascade->lock);
return count;
}
#define FLOOR_SYSFS(id) { \
__ATTR(f##id##_dps0_is_keylocked, S_IRUGO, dps0_is_key_locked, NULL), \
__ATTR(f##id##_dps1_is_keylocked, S_IRUGO, dps1_is_key_locked, NULL), \
__ATTR(f##id##_dps0_protection_key, S_IWUGO, NULL, dps0_insert_key), \
__ATTR(f##id##_dps1_protection_key, S_IWUGO, NULL, dps1_insert_key), \
}
static struct device_attribute doc_sys_attrs[DOC_MAX_NBFLOORS][4] = {
FLOOR_SYSFS(0), FLOOR_SYSFS(1), FLOOR_SYSFS(2), FLOOR_SYSFS(3)
};
static int doc_register_sysfs(struct platform_device *pdev,
struct docg3_cascade *cascade)
{
int ret = 0, floor, i = 0;
struct device *dev = &pdev->dev;
for (floor = 0; !ret && floor < DOC_MAX_NBFLOORS &&
cascade->floors[floor]; floor++)
for (i = 0; !ret && i < 4; i++)
ret = device_create_file(dev, &doc_sys_attrs[floor][i]);
if (!ret)
return 0;
do {
while (--i >= 0)
device_remove_file(dev, &doc_sys_attrs[floor][i]);
i = 4;
} while (--floor >= 0);
return ret;
}
static void doc_unregister_sysfs(struct platform_device *pdev,
struct docg3_cascade *cascade)
{
struct device *dev = &pdev->dev;
int floor, i;
for (floor = 0; floor < DOC_MAX_NBFLOORS && cascade->floors[floor];
floor++)
for (i = 0; i < 4; i++)
device_remove_file(dev, &doc_sys_attrs[floor][i]);
}
/*
* Debug sysfs entries
*/
static int dbg_flashctrl_show(struct seq_file *s, void *p)
{
struct docg3 *docg3 = (struct docg3 *)s->private;
int pos = 0;
u8 fctrl;
mutex_lock(&docg3->cascade->lock);
fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
mutex_unlock(&docg3->cascade->lock);
pos += seq_printf(s,
"FlashControl : 0x%02x (%s,CE# %s,%s,%s,flash %s)\n",
fctrl,
fctrl & DOC_CTRL_VIOLATION ? "protocol violation" : "-",
fctrl & DOC_CTRL_CE ? "active" : "inactive",
fctrl & DOC_CTRL_PROTECTION_ERROR ? "protection error" : "-",
fctrl & DOC_CTRL_SEQUENCE_ERROR ? "sequence error" : "-",
fctrl & DOC_CTRL_FLASHREADY ? "ready" : "not ready");
return pos;
}
DEBUGFS_RO_ATTR(flashcontrol, dbg_flashctrl_show);
static int dbg_asicmode_show(struct seq_file *s, void *p)
{
struct docg3 *docg3 = (struct docg3 *)s->private;
int pos = 0, pctrl, mode;
mutex_lock(&docg3->cascade->lock);
pctrl = doc_register_readb(docg3, DOC_ASICMODE);
mode = pctrl & 0x03;
mutex_unlock(&docg3->cascade->lock);
pos += seq_printf(s,
"%04x : RAM_WE=%d,RSTIN_RESET=%d,BDETCT_RESET=%d,WRITE_ENABLE=%d,POWERDOWN=%d,MODE=%d%d (",
pctrl,
pctrl & DOC_ASICMODE_RAM_WE ? 1 : 0,
pctrl & DOC_ASICMODE_RSTIN_RESET ? 1 : 0,
pctrl & DOC_ASICMODE_BDETCT_RESET ? 1 : 0,
pctrl & DOC_ASICMODE_MDWREN ? 1 : 0,
pctrl & DOC_ASICMODE_POWERDOWN ? 1 : 0,
mode >> 1, mode & 0x1);
switch (mode) {
case DOC_ASICMODE_RESET:
pos += seq_printf(s, "reset");
break;
case DOC_ASICMODE_NORMAL:
pos += seq_printf(s, "normal");
break;
case DOC_ASICMODE_POWERDOWN:
pos += seq_printf(s, "powerdown");
break;
}
pos += seq_printf(s, ")\n");
return pos;
}
DEBUGFS_RO_ATTR(asic_mode, dbg_asicmode_show);
static int dbg_device_id_show(struct seq_file *s, void *p)
{
struct docg3 *docg3 = (struct docg3 *)s->private;
int pos = 0;
int id;
mutex_lock(&docg3->cascade->lock);
id = doc_register_readb(docg3, DOC_DEVICESELECT);
mutex_unlock(&docg3->cascade->lock);
pos += seq_printf(s, "DeviceId = %d\n", id);
return pos;
}
DEBUGFS_RO_ATTR(device_id, dbg_device_id_show);
static int dbg_protection_show(struct seq_file *s, void *p)
{
struct docg3 *docg3 = (struct docg3 *)s->private;
int pos = 0;
int protect, dps0, dps0_low, dps0_high, dps1, dps1_low, dps1_high;
mutex_lock(&docg3->cascade->lock);
protect = doc_register_readb(docg3, DOC_PROTECTION);
dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS);
dps0_low = doc_register_readw(docg3, DOC_DPS0_ADDRLOW);
dps0_high = doc_register_readw(docg3, DOC_DPS0_ADDRHIGH);
dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS);
dps1_low = doc_register_readw(docg3, DOC_DPS1_ADDRLOW);
dps1_high = doc_register_readw(docg3, DOC_DPS1_ADDRHIGH);
mutex_unlock(&docg3->cascade->lock);
pos += seq_printf(s, "Protection = 0x%02x (",
protect);
if (protect & DOC_PROTECT_FOUNDRY_OTP_LOCK)
pos += seq_printf(s, "FOUNDRY_OTP_LOCK,");
if (protect & DOC_PROTECT_CUSTOMER_OTP_LOCK)
pos += seq_printf(s, "CUSTOMER_OTP_LOCK,");
if (protect & DOC_PROTECT_LOCK_INPUT)
pos += seq_printf(s, "LOCK_INPUT,");
if (protect & DOC_PROTECT_STICKY_LOCK)
pos += seq_printf(s, "STICKY_LOCK,");
if (protect & DOC_PROTECT_PROTECTION_ENABLED)
pos += seq_printf(s, "PROTECTION ON,");
if (protect & DOC_PROTECT_IPL_DOWNLOAD_LOCK)
pos += seq_printf(s, "IPL_DOWNLOAD_LOCK,");
if (protect & DOC_PROTECT_PROTECTION_ERROR)
pos += seq_printf(s, "PROTECT_ERR,");
else
pos += seq_printf(s, "NO_PROTECT_ERR");
pos += seq_printf(s, ")\n");
pos += seq_printf(s, "DPS0 = 0x%02x : "
"Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, "
"WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n",
dps0, dps0_low, dps0_high,
!!(dps0 & DOC_DPS_OTP_PROTECTED),
!!(dps0 & DOC_DPS_READ_PROTECTED),
!!(dps0 & DOC_DPS_WRITE_PROTECTED),
!!(dps0 & DOC_DPS_HW_LOCK_ENABLED),
!!(dps0 & DOC_DPS_KEY_OK));
pos += seq_printf(s, "DPS1 = 0x%02x : "
"Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, "
"WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n",
dps1, dps1_low, dps1_high,
!!(dps1 & DOC_DPS_OTP_PROTECTED),
!!(dps1 & DOC_DPS_READ_PROTECTED),
!!(dps1 & DOC_DPS_WRITE_PROTECTED),
!!(dps1 & DOC_DPS_HW_LOCK_ENABLED),
!!(dps1 & DOC_DPS_KEY_OK));
return pos;
}
DEBUGFS_RO_ATTR(protection, dbg_protection_show);
static int __init doc_dbg_register(struct docg3 *docg3)
{
struct dentry *root, *entry;
root = debugfs_create_dir("docg3", NULL);
if (!root)
return -ENOMEM;
entry = debugfs_create_file("flashcontrol", S_IRUSR, root, docg3,
&flashcontrol_fops);
if (entry)
entry = debugfs_create_file("asic_mode", S_IRUSR, root,
docg3, &asic_mode_fops);
if (entry)
entry = debugfs_create_file("device_id", S_IRUSR, root,
docg3, &device_id_fops);
if (entry)
entry = debugfs_create_file("protection", S_IRUSR, root,
docg3, &protection_fops);
if (entry) {
docg3->debugfs_root = root;
return 0;
} else {
debugfs_remove_recursive(root);
return -ENOMEM;
}
}
static void __exit doc_dbg_unregister(struct docg3 *docg3)
{
debugfs_remove_recursive(docg3->debugfs_root);
}
/**
* doc_set_driver_info - Fill the mtd_info structure and docg3 structure
* @chip_id: The chip ID of the supported chip
* @mtd: The structure to fill
*/
static void __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
{
struct docg3 *docg3 = mtd->priv;
int cfg;
cfg = doc_register_readb(docg3, DOC_CONFIGURATION);
docg3->if_cfg = (cfg & DOC_CONF_IF_CFG ? 1 : 0);
docg3->reliable = reliable_mode;
switch (chip_id) {
case DOC_CHIPID_G3:
mtd->name = kasprintf(GFP_KERNEL, "docg3.%d",
docg3->device_id);
docg3->max_block = 2047;
break;
}
mtd->type = MTD_NANDFLASH;
mtd->flags = MTD_CAP_NANDFLASH;
mtd->size = (docg3->max_block + 1) * DOC_LAYOUT_BLOCK_SIZE;
if (docg3->reliable == 2)
mtd->size /= 2;
mtd->erasesize = DOC_LAYOUT_BLOCK_SIZE * DOC_LAYOUT_NBPLANES;
if (docg3->reliable == 2)
mtd->erasesize /= 2;
mtd->writebufsize = mtd->writesize = DOC_LAYOUT_PAGE_SIZE;
mtd->oobsize = DOC_LAYOUT_OOB_SIZE;
mtd->owner = THIS_MODULE;
mtd->_erase = doc_erase;
mtd->_read = doc_read;
mtd->_write = doc_write;
mtd->_read_oob = doc_read_oob;
mtd->_write_oob = doc_write_oob;
mtd->_block_isbad = doc_block_isbad;
mtd->ecclayout = &docg3_oobinfo;
mtd->ecc_strength = DOC_ECC_BCH_T;
}
/**
* doc_probe_device - Check if a device is available
* @base: the io space where the device is probed
* @floor: the floor of the probed device
* @dev: the device
* @cascade: the cascade of chips this devices will belong to
*
* Checks whether a device at the specified IO range, and floor is available.
*
* Returns a mtd_info struct if there is a device, ENODEV if none found, ENOMEM
* if a memory allocation failed. If floor 0 is checked, a reset of the ASIC is
* launched.
*/
static struct mtd_info * __init
doc_probe_device(struct docg3_cascade *cascade, int floor, struct device *dev)
{
int ret, bbt_nbpages;
u16 chip_id, chip_id_inv;
struct docg3 *docg3;
struct mtd_info *mtd;
ret = -ENOMEM;
docg3 = kzalloc(sizeof(struct docg3), GFP_KERNEL);
if (!docg3)
goto nomem1;
mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
if (!mtd)
goto nomem2;
mtd->priv = docg3;
bbt_nbpages = DIV_ROUND_UP(docg3->max_block + 1,
8 * DOC_LAYOUT_PAGE_SIZE);
docg3->bbt = kzalloc(bbt_nbpages * DOC_LAYOUT_PAGE_SIZE, GFP_KERNEL);
if (!docg3->bbt)
goto nomem3;
docg3->dev = dev;
docg3->device_id = floor;
docg3->cascade = cascade;
doc_set_device_id(docg3, docg3->device_id);
if (!floor)
doc_set_asic_mode(docg3, DOC_ASICMODE_RESET);
doc_set_asic_mode(docg3, DOC_ASICMODE_NORMAL);
chip_id = doc_register_readw(docg3, DOC_CHIPID);
chip_id_inv = doc_register_readw(docg3, DOC_CHIPID_INV);
ret = 0;
if (chip_id != (u16)(~chip_id_inv)) {
goto nomem3;
}
switch (chip_id) {
case DOC_CHIPID_G3:
doc_info("Found a G3 DiskOnChip at addr %p, floor %d\n",
docg3->cascade->base, floor);
break;
default:
doc_err("Chip id %04x is not a DiskOnChip G3 chip\n", chip_id);
goto nomem3;
}
doc_set_driver_info(chip_id, mtd);
doc_hamming_ecc_init(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ);
doc_reload_bbt(docg3);
return mtd;
nomem3:
kfree(mtd);
nomem2:
kfree(docg3);
nomem1:
return ERR_PTR(ret);
}
/**
* doc_release_device - Release a docg3 floor
* @mtd: the device
*/
static void doc_release_device(struct mtd_info *mtd)
{
struct docg3 *docg3 = mtd->priv;
mtd_device_unregister(mtd);
kfree(docg3->bbt);
kfree(docg3);
kfree(mtd->name);
kfree(mtd);
}
/**
* docg3_resume - Awakens docg3 floor
* @pdev: platfrom device
*
* Returns 0 (always successfull)
*/
static int docg3_resume(struct platform_device *pdev)
{
int i;
struct docg3_cascade *cascade;
struct mtd_info **docg3_floors, *mtd;
struct docg3 *docg3;
cascade = platform_get_drvdata(pdev);
docg3_floors = cascade->floors;
mtd = docg3_floors[0];
docg3 = mtd->priv;
doc_dbg("docg3_resume()\n");
for (i = 0; i < 12; i++)
doc_readb(docg3, DOC_IOSPACE_IPL);
return 0;
}
/**
* docg3_suspend - Put in low power mode the docg3 floor
* @pdev: platform device
* @state: power state
*
* Shuts off most of docg3 circuitery to lower power consumption.
*
* Returns 0 if suspend succeeded, -EIO if chip refused suspend
*/
static int docg3_suspend(struct platform_device *pdev, pm_message_t state)
{
int floor, i;
struct docg3_cascade *cascade;
struct mtd_info **docg3_floors, *mtd;
struct docg3 *docg3;
u8 ctrl, pwr_down;
cascade = platform_get_drvdata(pdev);
docg3_floors = cascade->floors;
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) {
mtd = docg3_floors[floor];
if (!mtd)
continue;
docg3 = mtd->priv;
doc_writeb(docg3, floor, DOC_DEVICESELECT);
ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
ctrl &= ~DOC_CTRL_VIOLATION & ~DOC_CTRL_CE;
doc_writeb(docg3, ctrl, DOC_FLASHCONTROL);
for (i = 0; i < 10; i++) {
usleep_range(3000, 4000);
pwr_down = doc_register_readb(docg3, DOC_POWERMODE);
if (pwr_down & DOC_POWERDOWN_READY)
break;
}
if (pwr_down & DOC_POWERDOWN_READY) {
doc_dbg("docg3_suspend(): floor %d powerdown ok\n",
floor);
} else {
doc_err("docg3_suspend(): floor %d powerdown failed\n",
floor);
return -EIO;
}
}
mtd = docg3_floors[0];
docg3 = mtd->priv;
doc_set_asic_mode(docg3, DOC_ASICMODE_POWERDOWN);
return 0;
}
/**
* doc_probe - Probe the IO space for a DiskOnChip G3 chip
* @pdev: platform device
*
* Probes for a G3 chip at the specified IO space in the platform data
* ressources. The floor 0 must be available.
*
* Returns 0 on success, -ENOMEM, -ENXIO on error
*/
static int __init docg3_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtd_info *mtd;
struct resource *ress;
void __iomem *base;
int ret, floor, found = 0;
struct docg3_cascade *cascade;
ret = -ENXIO;
ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!ress) {
dev_err(dev, "No I/O memory resource defined\n");
goto noress;
}
base = ioremap(ress->start, DOC_IOSPACE_SIZE);
ret = -ENOMEM;
cascade = kzalloc(sizeof(*cascade) * DOC_MAX_NBFLOORS,
GFP_KERNEL);
if (!cascade)
goto nomem1;
cascade->base = base;
mutex_init(&cascade->lock);
cascade->bch = init_bch(DOC_ECC_BCH_M, DOC_ECC_BCH_T,
DOC_ECC_BCH_PRIMPOLY);
if (!cascade->bch)
goto nomem2;
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) {
mtd = doc_probe_device(cascade, floor, dev);
if (IS_ERR(mtd)) {
ret = PTR_ERR(mtd);
goto err_probe;
}
if (!mtd) {
if (floor == 0)
goto notfound;
else
continue;
}
cascade->floors[floor] = mtd;
ret = mtd_device_parse_register(mtd, part_probes, NULL, NULL,
0);
if (ret)
goto err_probe;
found++;
}
ret = doc_register_sysfs(pdev, cascade);
if (ret)
goto err_probe;
if (!found)
goto notfound;
platform_set_drvdata(pdev, cascade);
doc_dbg_register(cascade->floors[0]->priv);
return 0;
notfound:
ret = -ENODEV;
dev_info(dev, "No supported DiskOnChip found\n");
err_probe:
kfree(cascade->bch);
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
if (cascade->floors[floor])
doc_release_device(cascade->floors[floor]);
nomem2:
kfree(cascade);
nomem1:
iounmap(base);
noress:
return ret;
}
/**
* docg3_release - Release the driver
* @pdev: the platform device
*
* Returns 0
*/
static int __exit docg3_release(struct platform_device *pdev)
{
struct docg3_cascade *cascade = platform_get_drvdata(pdev);
struct docg3 *docg3 = cascade->floors[0]->priv;
void __iomem *base = cascade->base;
int floor;
doc_unregister_sysfs(pdev, cascade);
doc_dbg_unregister(docg3);
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
if (cascade->floors[floor])
doc_release_device(cascade->floors[floor]);
free_bch(docg3->cascade->bch);
kfree(cascade);
iounmap(base);
return 0;
}
static struct platform_driver g3_driver = {
.driver = {
.name = "docg3",
.owner = THIS_MODULE,
},
.suspend = docg3_suspend,
.resume = docg3_resume,
.remove = __exit_p(docg3_release),
};
static int __init docg3_init(void)
{
return platform_driver_probe(&g3_driver, docg3_probe);
}
module_init(docg3_init);
static void __exit docg3_exit(void)
{
platform_driver_unregister(&g3_driver);
}
module_exit(docg3_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
MODULE_DESCRIPTION("MTD driver for DiskOnChip G3");
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