/* * 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 #include #include #include #include #include #include #include #include #include #include #include #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 : * - block erase * - page write * - IPL write * - ECC fixing (lack of BCH algorith understanding) * - powerdown / powerup * * 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 part is only used for check purpose, no correction is available as * some information is missing. What is known is that : * - 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 inline u8 doc_readb(struct docg3 *docg3, u16 reg) { u8 val = readb(docg3->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->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->base + reg); trace_docg3_io(1, 16, reg, val); } static inline void doc_writew(struct docg3 *docg3, u16 val, u16 reg) { writew(val, docg3->base + reg); trace_docg3_io(1, 16, reg, val); } static inline void doc_flash_command(struct docg3 *docg3, u8 cmd) { doc_writeb(docg3, cmd, DOC_FLASHCOMMAND); } static inline void doc_flash_sequence(struct docg3 *docg3, u8 seq) { doc_writeb(docg3, seq, DOC_FLASHSEQUENCE); } static inline void doc_flash_address(struct docg3 *docg3, u8 addr) { doc_writeb(docg3, addr, DOC_FLASHADDRESS); } static char const *part_probes[] = { "cmdlinepart", "saftlpart", NULL }; static int doc_register_readb(struct docg3 *docg3, int reg) { u8 val; doc_writew(docg3, reg, DOC_READADDRESS); val = doc_readb(docg3, reg); doc_vdbg("Read register %04x : %02x\n", reg, val); return val; } static int doc_register_readw(struct docg3 *docg3, int reg) { u16 val; doc_writew(docg3, reg, DOC_READADDRESS); val = doc_readw(docg3, reg); doc_vdbg("Read register %04x : %04x\n", reg, val); return val; } /** * doc_delay - delay docg3 operations * @docg3: the device * @nbNOPs: the number of NOPs to issue * * As no specification is available, the right timings between chip commands are * unknown. The only available piece of information are the observed nops on a * working docg3 chip. * Therefore, doc_delay relies on a busy loop of NOPs, instead of scheduler * friendlier msleep() functions or blocking mdelay(). */ static void doc_delay(struct docg3 *docg3, int nbNOPs) { int i; doc_dbg("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 * @len: the lenght 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 & 0x3; 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); *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); *dst8 = data8; dst8++; } } } /** * doc_set_data_mode - Sets the flash to 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. */ static void doc_set_reliable_mode(struct docg3 *docg3) { doc_dbg("doc_set_reliable_mode()\n"); doc_flash_sequence(docg3, DOC_SEQ_SET_MODE); doc_flash_command(docg3, DOC_CMD_FAST_MODE); doc_flash_command(docg3, DOC_CMD_RELIABLE_MODE); doc_delay(docg3, 2); } /** * doc_set_asic_mode - Set the ASIC mode * @docg3: the device * @mode: the mode * * The ASIC can work in 3 modes : * - RESET: all registers are zeroed * - NORMAL: receives and handles commands * - POWERDOWN: minimal poweruse, flash parts shut off */ static void doc_set_asic_mode(struct docg3 *docg3, u8 mode) { int i; for (i = 0; i < 12; i++) doc_readb(docg3, DOC_IOSPACE_IPL); mode |= DOC_ASICMODE_MDWREN; doc_dbg("doc_set_asic_mode(%02x)\n", mode); doc_writeb(docg3, mode, DOC_ASICMODE); doc_writeb(docg3, ~mode, DOC_ASICMODECONFIRM); doc_delay(docg3, 1); } /** * doc_set_device_id - Sets the devices id for cascaded G3 chips * @docg3: the device * @id: the chip to select (amongst 0, 1, 2, 3) * * There can be 4 cascaded G3 chips. This function selects the one which will * should be the active one. */ static void doc_set_device_id(struct docg3 *docg3, int id) { u8 ctrl; doc_dbg("doc_set_device_id(%d)\n", id); doc_writeb(docg3, id, DOC_DEVICESELECT); ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL); ctrl &= ~DOC_CTRL_VIOLATION; ctrl |= DOC_CTRL_CE; doc_writeb(docg3, ctrl, DOC_FLASHCONTROL); } /** * doc_set_extra_page_mode - Change flash page layout * @docg3: the device * * Normally, the flash page is split into the data (512 bytes) and the out of * band data (16 bytes). For each, 4 more bytes can be accessed, where the wear * leveling counters are stored. To access this last area of 4 bytes, a special * mode must be input to the flash ASIC. * * Returns 0 if no error occured, -EIO else. */ static int doc_set_extra_page_mode(struct docg3 *docg3) { int fctrl; doc_dbg("doc_set_extra_page_mode()\n"); doc_flash_sequence(docg3, DOC_SEQ_PAGE_SIZE_532); doc_flash_command(docg3, DOC_CMD_PAGE_SIZE_532); doc_delay(docg3, 2); fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL); if (fctrl & (DOC_CTRL_PROTECTION_ERROR | DOC_CTRL_SEQUENCE_ERROR)) return -EIO; else return 0; } /** * doc_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; sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK); doc_flash_sequence(docg3, DOC_SEQ_READ); doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR); doc_delay(docg3, 1); doc_flash_address(docg3, sector & 0xff); doc_flash_address(docg3, (sector >> 8) & 0xff); doc_flash_address(docg3, (sector >> 16) & 0xff); doc_delay(docg3, 1); sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK); doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR); doc_delay(docg3, 1); doc_flash_address(docg3, sector & 0xff); doc_flash_address(docg3, (sector >> 8) & 0xff); doc_flash_address(docg3, (sector >> 16) & 0xff); doc_delay(docg3, 2); 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 Syndroms (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_read_page_prepare - Prepares reading data from a flash page * @docg3: the device * @block0: the first plane block index on flash memory * @block1: the second plane block index on flash memory * @page: the page index in the block * @offset: the offset in the page (must be a multiple of 4) * * Prepares the page to be read in the flash memory : * - tell ASIC to map the flash pages * - tell ASIC to be in read mode * * After a call to this method, a call to doc_read_page_finish is mandatory, * to end the read cycle of the flash. * * Read data from a flash page. The length to be read must be between 0 and * (page_size + oob_size + wear_size), ie. 532, and a multiple of 4 (because * the extra bytes reading is not implemented). * * As pages are grouped by 2 (in 2 planes), reading from a page must be done * in two steps: * - one read of 512 bytes at offset 0 * - one read of 512 bytes at offset 512 + 16 * * Returns 0 if successful, -EIO if a read error occured. */ static int doc_read_page_prepare(struct docg3 *docg3, int block0, int block1, int page, int offset) { int wear_area = 0, ret = 0; doc_dbg("doc_read_page_prepare(blocks=(%d,%d), page=%d, ofsInPage=%d)\n", block0, block1, page, offset); if (offset >= DOC_LAYOUT_WEAR_OFFSET) wear_area = 1; if (!wear_area && offset > (DOC_LAYOUT_PAGE_OOB_SIZE * 2)) return -EINVAL; doc_set_device_id(docg3, docg3->device_id); ret = doc_reset_seq(docg3); if (ret) goto err; /* Program the flash address block and page */ ret = doc_read_seek(docg3, block0, block1, page, wear_area, offset); if (ret) goto err; doc_flash_command(docg3, DOC_CMD_READ_ALL_PLANES); doc_delay(docg3, 2); doc_wait_ready(docg3); doc_flash_command(docg3, DOC_CMD_SET_ADDR_READ); doc_delay(docg3, 1); if (offset >= DOC_LAYOUT_PAGE_SIZE * 2) offset -= 2 * DOC_LAYOUT_PAGE_SIZE; doc_flash_address(docg3, offset >> 2); doc_delay(docg3, 1); doc_wait_ready(docg3); doc_flash_command(docg3, DOC_CMD_READ_FLASH); return 0; err: doc_writeb(docg3, 0, DOC_DATAEND); doc_delay(docg3, 2); return -EIO; } /** * doc_read_page_getbytes - Reads bytes from a prepared page * @docg3: the device * @len: the number of bytes to be read (must be a multiple of 4) * @buf: the buffer to be filled in * @first: 1 if first time read, DOC_READADDRESS should be set * */ static int doc_read_page_getbytes(struct docg3 *docg3, int len, u_char *buf, int first) { doc_read_data_area(docg3, buf, len, first); doc_delay(docg3, 2); return len; } /** * doc_get_hw_bch_syndroms - Get hardware calculated BCH syndroms * @docg3: the device * @syns: the array of 7 integers where the syndroms will be stored */ static void doc_get_hw_bch_syndroms(struct docg3 *docg3, int *syns) { int i; for (i = 0; i < DOC_ECC_BCH_SIZE; i++) syns[i] = doc_register_readb(docg3, DOC_BCH_SYNDROM(i)); } /** * 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_writeb(docg3, 0, DOC_DATAEND); doc_delay(docg3, 2); 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 */ static void calc_block_sector(loff_t from, int *block0, int *block1, int *page, int *ofs) { uint sector; sector = from / DOC_LAYOUT_PAGE_SIZE; *block0 = sector / (DOC_LAYOUT_PAGES_PER_BLOCK * DOC_LAYOUT_NBPLANES) * DOC_LAYOUT_NBPLANES; *block1 = *block0 + 1; *page = sector % (DOC_LAYOUT_PAGES_PER_BLOCK * DOC_LAYOUT_NBPLANES); *page /= DOC_LAYOUT_NBPLANES; if (sector % 2) *ofs = DOC_LAYOUT_PAGE_OOB_SIZE; else *ofs = 0; } /** * doc_read - Read bytes from flash * @mtd: the device * @from: the offset from first block and first page, in bytes, aligned on page * size * @len: the number of bytes to read (must be a multiple of 4) * @retlen: the number of bytes actually read * @buf: the filled in buffer * * Reads flash memory pages. This function does not read the OOB chunk, but only * the page data. * * Returns 0 if read successfull, of -EIO, -EINVAL if an error occured */ static int doc_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct docg3 *docg3 = mtd->priv; int block0, block1, page, readlen, ret, ofs = 0; int syn[DOC_ECC_BCH_SIZE], eccconf1; u8 oob[DOC_LAYOUT_OOB_SIZE]; ret = -EINVAL; doc_dbg("doc_read(from=%lld, len=%zu, buf=%p)\n", from, len, buf); if (from % DOC_LAYOUT_PAGE_SIZE) goto err; if (len % 4) goto err; calc_block_sector(from, &block0, &block1, &page, &ofs); if (block1 > docg3->max_block) goto err; *retlen = 0; ret = 0; readlen = min_t(size_t, len, (size_t)DOC_LAYOUT_PAGE_SIZE); while (!ret && len > 0) { readlen = min_t(size_t, len, (size_t)DOC_LAYOUT_PAGE_SIZE); ret = doc_read_page_prepare(docg3, block0, block1, page, ofs); if (ret < 0) goto err; ret = doc_read_page_ecc_init(docg3, DOC_ECC_BCH_COVERED_BYTES); if (ret < 0) goto err_in_read; ret = doc_read_page_getbytes(docg3, readlen, buf, 1); if (ret < readlen) goto err_in_read; ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE, oob, 0); if (ret < DOC_LAYOUT_OOB_SIZE) goto err_in_read; *retlen += readlen; buf += readlen; len -= readlen; ofs ^= DOC_LAYOUT_PAGE_OOB_SIZE; if (ofs == 0) page += 2; if (page > DOC_ADDR_PAGE_MASK) { page = 0; block0 += 2; block1 += 2; } /* * There should be a BCH bitstream fixing algorithm here ... * By now, a page read failure is triggered by BCH error */ doc_get_hw_bch_syndroms(docg3, syn); eccconf1 = doc_register_readb(docg3, DOC_ECCCONF1); doc_dbg("OOB - INFO: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n", oob[0], oob[1], oob[2], oob[3], oob[4], oob[5], oob[6]); doc_dbg("OOB - HAMMING: %02x\n", oob[7]); doc_dbg("OOB - BCH_ECC: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n", oob[8], oob[9], oob[10], oob[11], oob[12], oob[13], oob[14]); doc_dbg("OOB - UNUSED: %02x\n", oob[15]); doc_dbg("ECC checks: ECCConf1=%x\n", eccconf1); doc_dbg("ECC BCH syndrom: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n", syn[0], syn[1], syn[2], syn[3], syn[4], syn[5], syn[6]); ret = -EBADMSG; if (block0 >= DOC_LAYOUT_BLOCK_FIRST_DATA) { if (eccconf1 & DOC_ECCCONF1_BCH_SYNDROM_ERR) goto err_in_read; if (is_prot_seq_error(docg3)) goto err_in_read; } doc_read_page_finish(docg3); } return 0; err_in_read: doc_read_page_finish(docg3); err: return ret; } /** * doc_read_oob - Read out of band bytes from flash * @mtd: the device * @from: the offset from first block and first page, in bytes, aligned on page * size * @ops: the mtd oob structure * * Reads flash memory OOB area of pages. * * Returns 0 if read successfull, of -EIO, -EINVAL if an error occured */ static int doc_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) { struct docg3 *docg3 = mtd->priv; int block0, block1, page, ofs, ret; u8 *buf = ops->oobbuf; size_t len = ops->ooblen; doc_dbg("doc_read_oob(from=%lld, buf=%p, len=%zu)\n", from, buf, len); if (len != DOC_LAYOUT_OOB_SIZE) return -EINVAL; switch (ops->mode) { case MTD_OPS_PLACE_OOB: buf += ops->ooboffs; break; default: break; } calc_block_sector(from, &block0, &block1, &page, &ofs); if (block1 > docg3->max_block) return -EINVAL; ret = doc_read_page_prepare(docg3, block0, block1, page, ofs + DOC_LAYOUT_PAGE_SIZE); if (!ret) ret = doc_read_page_ecc_init(docg3, DOC_LAYOUT_OOB_SIZE); if (!ret) ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE, buf, 1); doc_read_page_finish(docg3); if (ret > 0) ops->oobretlen = ret; else ops->oobretlen = 0; return (ret > 0) ? 0 : 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); 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); 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; } /** * 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); 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); if (!ret) ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_WEAR_SIZE, buf, 1); 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); } /* * Debug sysfs entries */ static int dbg_flashctrl_show(struct seq_file *s, void *p) { struct docg3 *docg3 = (struct docg3 *)s->private; int pos = 0; u8 fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL); pos += seq_printf(s, "FlashControl : 0x%02x (%s,CE# %s,%s,%s,flash %s)\n", fctrl, fctrl & DOC_CTRL_VIOLATION ? "protocol violation" : "-", fctrl & DOC_CTRL_CE ? "active" : "inactive", fctrl & DOC_CTRL_PROTECTION_ERROR ? "protection error" : "-", fctrl & DOC_CTRL_SEQUENCE_ERROR ? "sequence error" : "-", fctrl & DOC_CTRL_FLASHREADY ? "ready" : "not ready"); return pos; } DEBUGFS_RO_ATTR(flashcontrol, dbg_flashctrl_show); static int dbg_asicmode_show(struct seq_file *s, void *p) { struct docg3 *docg3 = (struct docg3 *)s->private; int pos = 0; int pctrl = doc_register_readb(docg3, DOC_ASICMODE); int mode = pctrl & 0x03; pos += seq_printf(s, "%04x : RAM_WE=%d,RSTIN_RESET=%d,BDETCT_RESET=%d,WRITE_ENABLE=%d,POWERDOWN=%d,MODE=%d%d (", pctrl, pctrl & DOC_ASICMODE_RAM_WE ? 1 : 0, pctrl & DOC_ASICMODE_RSTIN_RESET ? 1 : 0, pctrl & DOC_ASICMODE_BDETCT_RESET ? 1 : 0, pctrl & DOC_ASICMODE_MDWREN ? 1 : 0, pctrl & DOC_ASICMODE_POWERDOWN ? 1 : 0, mode >> 1, mode & 0x1); switch (mode) { case DOC_ASICMODE_RESET: pos += seq_printf(s, "reset"); break; case DOC_ASICMODE_NORMAL: pos += seq_printf(s, "normal"); break; case DOC_ASICMODE_POWERDOWN: pos += seq_printf(s, "powerdown"); break; } pos += seq_printf(s, ")\n"); return pos; } DEBUGFS_RO_ATTR(asic_mode, dbg_asicmode_show); static int dbg_device_id_show(struct seq_file *s, void *p) { struct docg3 *docg3 = (struct docg3 *)s->private; int pos = 0; int id = doc_register_readb(docg3, DOC_DEVICESELECT); pos += seq_printf(s, "DeviceId = %d\n", id); return pos; } DEBUGFS_RO_ATTR(device_id, dbg_device_id_show); static int dbg_protection_show(struct seq_file *s, void *p) { struct docg3 *docg3 = (struct docg3 *)s->private; int pos = 0; int protect = doc_register_readb(docg3, DOC_PROTECTION); int dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS); int dps0_low = doc_register_readb(docg3, DOC_DPS0_ADDRLOW); int dps0_high = doc_register_readb(docg3, DOC_DPS0_ADDRHIGH); int dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS); int dps1_low = doc_register_readb(docg3, DOC_DPS1_ADDRLOW); int dps1_high = doc_register_readb(docg3, DOC_DPS1_ADDRHIGH); pos += seq_printf(s, "Protection = 0x%02x (", protect); if (protect & DOC_PROTECT_FOUNDRY_OTP_LOCK) pos += seq_printf(s, "FOUNDRY_OTP_LOCK,"); if (protect & DOC_PROTECT_CUSTOMER_OTP_LOCK) pos += seq_printf(s, "CUSTOMER_OTP_LOCK,"); if (protect & DOC_PROTECT_LOCK_INPUT) pos += seq_printf(s, "LOCK_INPUT,"); if (protect & DOC_PROTECT_STICKY_LOCK) pos += seq_printf(s, "STICKY_LOCK,"); if (protect & DOC_PROTECT_PROTECTION_ENABLED) pos += seq_printf(s, "PROTECTION ON,"); if (protect & DOC_PROTECT_IPL_DOWNLOAD_LOCK) pos += seq_printf(s, "IPL_DOWNLOAD_LOCK,"); if (protect & DOC_PROTECT_PROTECTION_ERROR) pos += seq_printf(s, "PROTECT_ERR,"); else pos += seq_printf(s, "NO_PROTECT_ERR"); pos += seq_printf(s, ")\n"); pos += seq_printf(s, "DPS0 = 0x%02x : " "Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, " "WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n", dps0, dps0_low, dps0_high, !!(dps0 & DOC_DPS_OTP_PROTECTED), !!(dps0 & DOC_DPS_READ_PROTECTED), !!(dps0 & DOC_DPS_WRITE_PROTECTED), !!(dps0 & DOC_DPS_HW_LOCK_ENABLED), !!(dps0 & DOC_DPS_KEY_OK)); pos += seq_printf(s, "DPS1 = 0x%02x : " "Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, " "WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n", dps1, dps1_low, dps1_high, !!(dps1 & DOC_DPS_OTP_PROTECTED), !!(dps1 & DOC_DPS_READ_PROTECTED), !!(dps1 & DOC_DPS_WRITE_PROTECTED), !!(dps1 & DOC_DPS_HW_LOCK_ENABLED), !!(dps1 & DOC_DPS_KEY_OK)); return pos; } DEBUGFS_RO_ATTR(protection, dbg_protection_show); static int __init doc_dbg_register(struct docg3 *docg3) { struct dentry *root, *entry; root = debugfs_create_dir("docg3", NULL); if (!root) return -ENOMEM; entry = debugfs_create_file("flashcontrol", S_IRUSR, root, docg3, &flashcontrol_fops); if (entry) entry = debugfs_create_file("asic_mode", S_IRUSR, root, docg3, &asic_mode_fops); if (entry) entry = debugfs_create_file("device_id", S_IRUSR, root, docg3, &device_id_fops); if (entry) entry = debugfs_create_file("protection", S_IRUSR, root, docg3, &protection_fops); if (entry) { docg3->debugfs_root = root; return 0; } else { debugfs_remove_recursive(root); return -ENOMEM; } } static void __exit doc_dbg_unregister(struct docg3 *docg3) { debugfs_remove_recursive(docg3->debugfs_root); } /** * doc_set_driver_info - Fill the mtd_info structure and docg3 structure * @chip_id: The chip ID of the supported chip * @mtd: The structure to fill */ static void __init doc_set_driver_info(int chip_id, struct mtd_info *mtd) { struct docg3 *docg3 = mtd->priv; int cfg; cfg = doc_register_readb(docg3, DOC_CONFIGURATION); docg3->if_cfg = (cfg & DOC_CONF_IF_CFG ? 1 : 0); switch (chip_id) { case DOC_CHIPID_G3: mtd->name = "DiskOnChip G3"; docg3->max_block = 2047; break; } mtd->type = MTD_NANDFLASH; /* * Once write methods are added, the correct flags will be set. * mtd->flags = MTD_CAP_NANDFLASH; */ mtd->flags = MTD_CAP_ROM; mtd->size = (docg3->max_block + 1) * DOC_LAYOUT_BLOCK_SIZE; mtd->erasesize = DOC_LAYOUT_BLOCK_SIZE * DOC_LAYOUT_NBPLANES; mtd->writesize = DOC_LAYOUT_PAGE_SIZE; mtd->oobsize = DOC_LAYOUT_OOB_SIZE; mtd->owner = THIS_MODULE; mtd->erase = NULL; mtd->point = NULL; mtd->unpoint = NULL; mtd->read = doc_read; mtd->write = NULL; mtd->read_oob = doc_read_oob; mtd->write_oob = NULL; mtd->sync = NULL; mtd->block_isbad = doc_block_isbad; } /** * 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. * * Returns 0 on success, -ENOMEM, -ENXIO on error */ static int __init docg3_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct docg3 *docg3; struct mtd_info *mtd; struct resource *ress; int ret, bbt_nbpages; u16 chip_id, chip_id_inv; 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; ret = -ENXIO; ress = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!ress) { dev_err(dev, "No I/O memory resource defined\n"); goto noress; } docg3->base = ioremap(ress->start, DOC_IOSPACE_SIZE); docg3->dev = &pdev->dev; docg3->device_id = 0; doc_set_device_id(docg3, docg3->device_id); 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 = -ENODEV; if (chip_id != (u16)(~chip_id_inv)) { doc_info("No device found at IO addr %p\n", (void *)ress->start); goto nochipfound; } switch (chip_id) { case DOC_CHIPID_G3: doc_info("Found a G3 DiskOnChip at addr %p\n", (void *)ress->start); break; default: doc_err("Chip id %04x is not a DiskOnChip G3 chip\n", chip_id); goto nochipfound; } doc_set_driver_info(chip_id, mtd); platform_set_drvdata(pdev, mtd); ret = -ENOMEM; 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 nochipfound; doc_reload_bbt(docg3); ret = mtd_device_parse_register(mtd, part_probes, NULL, NULL, 0); if (ret) goto register_error; doc_dbg_register(docg3); return 0; register_error: kfree(docg3->bbt); nochipfound: iounmap(docg3->base); noress: kfree(mtd); nomem2: kfree(docg3); nomem1: return ret; } /** * docg3_release - Release the driver * @pdev: the platform device * * Returns 0 */ static int __exit docg3_release(struct platform_device *pdev) { struct mtd_info *mtd = platform_get_drvdata(pdev); struct docg3 *docg3 = mtd->priv; doc_dbg_unregister(docg3); mtd_device_unregister(mtd); iounmap(docg3->base); kfree(docg3->bbt); kfree(docg3); kfree(mtd); return 0; } static struct platform_driver g3_driver = { .driver = { .name = "docg3", .owner = THIS_MODULE, }, .remove = __exit_p(docg3_release), }; static int __init docg3_init(void) { return platform_driver_probe(&g3_driver, docg3_probe); } module_init(docg3_init); static void __exit docg3_exit(void) { platform_driver_unregister(&g3_driver); } module_exit(docg3_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Robert Jarzmik "); MODULE_DESCRIPTION("MTD driver for DiskOnChip G3");