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Diffstat (limited to 'drivers/mtd/devices/docg3.c')
| -rw-r--r-- | drivers/mtd/devices/docg3.c | 2141 |
1 files changed, 2141 insertions, 0 deletions
diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c new file mode 100644 index 000000000..866d31904 --- /dev/null +++ b/drivers/mtd/devices/docg3.c @@ -0,0 +1,2141 @@ +/* + * 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"); |