--- /dev/null
+/*
+ * 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/of.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 * 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 occurred, -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 occurred.
+ */
+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 successful, of -EIO, -EINVAL if an error occurred
+ */
+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: %*phC\n", 7, oobbuf);
+ doc_dbg("OOB - HAMMING: %02x\n", oobbuf[7]);
+ doc_dbg("OOB - BCH_ECC: %*phC\n", 7, oobbuf + 8);
+ doc_dbg("OOB - UNUSED: %02x\n", oobbuf[15]);
+ }
+ doc_dbg("ECC checks: ECCConf1=%x\n", eccconf1);
+ doc_dbg("ECC HW_ECC: %*phC\n", 7, hwecc);
+
+ 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 successful, of -EIO, -EINVAL if an error occurred
+ */
+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 successful, -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 addressing 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 successful, 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:
+ return -EINVAL;
+ }
+ 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_IWUSR|S_IWGRP, NULL, dps0_insert_key), \
+ __ATTR(f##id##_dps1_protection_key, S_IWUSR|S_IWGRP, 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;
+
+ u8 fctrl;
+
+ mutex_lock(&docg3->cascade->lock);
+ fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
+ mutex_unlock(&docg3->cascade->lock);
+
+ 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 0;
+}
+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 pctrl, mode;
+
+ mutex_lock(&docg3->cascade->lock);
+ pctrl = doc_register_readb(docg3, DOC_ASICMODE);
+ mode = pctrl & 0x03;
+ mutex_unlock(&docg3->cascade->lock);
+
+ 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:
+ seq_puts(s, "reset");
+ break;
+ case DOC_ASICMODE_NORMAL:
+ seq_puts(s, "normal");
+ break;
+ case DOC_ASICMODE_POWERDOWN:
+ seq_puts(s, "powerdown");
+ break;
+ }
+ seq_puts(s, ")\n");
+ return 0;
+}
+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 id;
+
+ mutex_lock(&docg3->cascade->lock);
+ id = doc_register_readb(docg3, DOC_DEVICESELECT);
+ mutex_unlock(&docg3->cascade->lock);
+
+ seq_printf(s, "DeviceId = %d\n", id);
+ return 0;
+}
+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 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);
+
+ seq_printf(s, "Protection = 0x%02x (", protect);
+ if (protect & DOC_PROTECT_FOUNDRY_OTP_LOCK)
+ seq_puts(s, "FOUNDRY_OTP_LOCK,");
+ if (protect & DOC_PROTECT_CUSTOMER_OTP_LOCK)
+ seq_puts(s, "CUSTOMER_OTP_LOCK,");
+ if (protect & DOC_PROTECT_LOCK_INPUT)
+ seq_puts(s, "LOCK_INPUT,");
+ if (protect & DOC_PROTECT_STICKY_LOCK)
+ seq_puts(s, "STICKY_LOCK,");
+ if (protect & DOC_PROTECT_PROTECTION_ENABLED)
+ seq_puts(s, "PROTECTION ON,");
+ if (protect & DOC_PROTECT_IPL_DOWNLOAD_LOCK)
+ seq_puts(s, "IPL_DOWNLOAD_LOCK,");
+ if (protect & DOC_PROTECT_PROTECTION_ERROR)
+ seq_puts(s, "PROTECT_ERR,");
+ else
+ seq_puts(s, "NO_PROTECT_ERR");
+ seq_puts(s, ")\n");
+
+ 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));
+ 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 0;
+}
+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 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 successful)
+ */
+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;
+ 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");
+ return ret;
+ }
+ base = devm_ioremap(dev, ress->start, DOC_IOSPACE_SIZE);
+
+ ret = -ENOMEM;
+ cascade = devm_kzalloc(dev, sizeof(*cascade) * DOC_MAX_NBFLOORS,
+ GFP_KERNEL);
+ if (!cascade)
+ return ret;
+ 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)
+ return ret;
+
+ 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;
+ }
+
+ ret = doc_register_sysfs(pdev, cascade);
+ if (ret)
+ goto err_probe;
+
+ 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:
+ free_bch(cascade->bch);
+ for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
+ if (cascade->floors[floor])
+ doc_release_device(cascade->floors[floor]);
+ return ret;
+}
+
+/**
+ * docg3_release - Release the driver
+ * @pdev: the platform device
+ *
+ * Returns 0
+ */
+static int docg3_release(struct platform_device *pdev)
+{
+ struct docg3_cascade *cascade = platform_get_drvdata(pdev);
+ struct docg3 *docg3 = cascade->floors[0]->priv;
+ 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);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static struct of_device_id docg3_dt_ids[] = {
+ { .compatible = "m-systems,diskonchip-g3" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, docg3_dt_ids);
+#endif
+
+static struct platform_driver g3_driver = {
+ .driver = {
+ .name = "docg3",
+ .of_match_table = of_match_ptr(docg3_dt_ids),
+ },
+ .suspend = docg3_suspend,
+ .resume = docg3_resume,
+ .remove = docg3_release,
+};
+
+module_platform_driver_probe(g3_driver, docg3_probe);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
+MODULE_DESCRIPTION("MTD driver for DiskOnChip G3");
Code Review / kvmfornfv.git / blobdiff