diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/mtd/Makefile | 4 | ||||
| -rw-r--r-- | drivers/mtd/onenand/Kconfig | 32 | ||||
| -rw-r--r-- | drivers/mtd/onenand/Makefile | 9 | ||||
| -rw-r--r-- | drivers/mtd/onenand/omap-onenand.c | 178 | ||||
| -rw-r--r-- | drivers/mtd/onenand/onenand_base.c | 1462 |
6 files changed, 1689 insertions, 6 deletions
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig index 843a1cbe0866..3dbfbafb3481 100644 --- a/drivers/mtd/Kconfig +++ b/drivers/mtd/Kconfig @@ -1,4 +1,4 @@ -# $Id: Kconfig,v 1.9 2005/06/16 08:49:29 sean Exp $ +# $Id: Kconfig,v 1.10 2005/07/11 10:39:27 gleixner Exp $ menu "Memory Technology Devices (MTD)" @@ -259,9 +259,9 @@ config RFD_FTL ---help--- This provides support for the flash translation layer known as the Resident Flash Disk (RFD), as used by the Embedded BIOS - of General Software. - See http://www.gensw.com/pages/prod/bios/rfd.htm for further - information. + of General Software. There is a blurb at: + + http://www.gensw.com/pages/prod/bios/rfd.htm source "drivers/mtd/chips/Kconfig" @@ -271,5 +271,7 @@ source "drivers/mtd/devices/Kconfig" source "drivers/mtd/nand/Kconfig" +source "drivers/mtd/onenand/Kconfig" + endmenu diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile index cb16b7d478ce..fc9374407c2b 100644 --- a/drivers/mtd/Makefile +++ b/drivers/mtd/Makefile @@ -1,7 +1,7 @@ # # Makefile for the memory technology device drivers. # -# $Id: Makefile.common,v 1.6 2005/06/16 08:49:29 sean Exp $ +# $Id: Makefile.common,v 1.7 2005/07/11 10:39:27 gleixner Exp $ # Core functionality. mtd-y := mtdcore.o @@ -25,4 +25,4 @@ obj-$(CONFIG_RFD_FTL) += rfd_ftl.o mtd_blkdevs.o nftl-objs := nftlcore.o nftlmount.o inftl-objs := inftlcore.o inftlmount.o -obj-y += chips/ maps/ devices/ nand/ +obj-y += chips/ maps/ devices/ nand/ onenand/ diff --git a/drivers/mtd/onenand/Kconfig b/drivers/mtd/onenand/Kconfig new file mode 100644 index 000000000000..7d76ede984d8 --- /dev/null +++ b/drivers/mtd/onenand/Kconfig @@ -0,0 +1,32 @@ +# +# linux/drivers/mtd/onenand/Kconfig +# + +menu "OneNAND Flash Device Drivers (EXPERIMENTAL)" + depends on MTD != n && EXPERIMENTAL + +config MTD_ONENAND + tristate "OneNAND Device Support" + depends on MTD + help + This enables support for accessing all type of OneNAND flash + devices. For further information see + <http://www.samsung.com/Products/Semiconductor/Flash/OneNAND_TM/index.htm>. + +config MTD_ONENAND_VERIFY_WRITE + bool "Verify OneNAND page writes" + depends on MTD_ONENAND + help + This adds an extra check when data is written to the flash. The + OneNAND flash device internally checks only bits transitioning + from 1 to 0. There is a rare possibility that even though the + device thinks the write was successful, a bit could have been + flipped accidentaly due to device wear or something else. + +config MTD_ONENAND_OMAP + tristate "OneNAND Flash device on OMAP board" + depends on ARCH_OMAP && MTD_ONENAND + help + Support for OneNAND flash on TI OMAP board. + +endmenu diff --git a/drivers/mtd/onenand/Makefile b/drivers/mtd/onenand/Makefile new file mode 100644 index 000000000000..f4e75864d8b5 --- /dev/null +++ b/drivers/mtd/onenand/Makefile @@ -0,0 +1,9 @@ +# +# Makefile for the OneNAND MTD +# + +# Core functionality. +obj-$(CONFIG_MTD_ONENAND) += onenand_base.o + +# Board specific. +obj-$(CONFIG_MTD_ONENAND_OMAP) += omap-onenand.o diff --git a/drivers/mtd/onenand/omap-onenand.c b/drivers/mtd/onenand/omap-onenand.c new file mode 100644 index 000000000000..56e1aec6b835 --- /dev/null +++ b/drivers/mtd/onenand/omap-onenand.c @@ -0,0 +1,178 @@ +/* + * linux/drivers/mtd/onenand/omap-onenand.c + * + * Copyright (c) 2005 Samsung Electronics + * Kyungmin Park <kyungmin.park@samsung.com> + * + * Derived from linux/drivers/mtd/nand/omap-nand-flash.c + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Overview: + * This is a device driver for the OneNAND flash device for TI OMAP boards. + */ + +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/onenand.h> +#include <linux/mtd/partitions.h> + +#include <asm/io.h> +#include <asm/arch/hardware.h> +#include <asm/arch/tc.h> +#include <asm/sizes.h> + +#define OMAP_ONENAND_FLASH_START1 OMAP_CS2A_PHYS +#define OMAP_ONENAND_FLASH_START2 OMAP_CS0_PHYS +/* + * MTD structure for OMAP board + */ +static struct mtd_info *omap_onenand_mtd = NULL; + +/* + * Define partitions for flash devices + */ + +#ifdef CONFIG_MTD_PARTITIONS +static struct mtd_partition static_partition[] = { + { + .name = "X-Loader + U-Boot", + .offset = 0, + .size = SZ_128K, + .mask_flags = MTD_WRITEABLE /* force read-only */ + }, + { + .name = "U-Boot Environment", + .offset = MTDPART_OFS_APPEND, + .size = SZ_128K, + .mask_flags = MTD_WRITEABLE /* force read-only */ + }, + { + .name = "kernel", + .offset = MTDPART_OFS_APPEND, + .size = 2 * SZ_1M + }, + { + .name = "filesystem0", + .offset = MTDPART_OFS_APPEND, + .size = SZ_16M, + }, + { + .name = "filesystem1", + .offset = MTDPART_OFS_APPEND, + .size = MTDPART_SIZ_FULL, + }, +}; + +const char *part_probes[] = { "cmdlinepart", NULL, }; + +#endif + +/* Scan to find existance of the device at base. + This also allocates oob and data internal buffers */ +static char onenand_name[] = "onenand"; + +/* + * Main initialization routine + */ +static int __init omap_onenand_init (void) +{ + struct onenand_chip *this; + struct mtd_partition *dynamic_partition = 0; + int err = 0; + + /* Allocate memory for MTD device structure and private data */ + omap_onenand_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct onenand_chip), + GFP_KERNEL); + if (!omap_onenand_mtd) { + printk (KERN_WARNING "Unable to allocate OneNAND MTD device structure.\n"); + err = -ENOMEM; + goto out; + } + + /* Get pointer to private data */ + this = (struct onenand_chip *) (&omap_onenand_mtd[1]); + + /* Initialize structures */ + memset((char *) omap_onenand_mtd, 0, sizeof(struct mtd_info) + sizeof(struct onenand_chip)); + + /* Link the private data with the MTD structure */ + omap_onenand_mtd->priv = this; + + /* try the first address */ + this->base = ioremap(OMAP_ONENAND_FLASH_START1, SZ_128K); + omap_onenand_mtd->name = onenand_name; + if (onenand_scan(omap_onenand_mtd, 1)){ + /* try the second address */ + iounmap(this->base); + this->base = ioremap(OMAP_ONENAND_FLASH_START2, SZ_128K); + if (onenand_scan(omap_onenand_mtd, 1)) { + iounmap(this->base); + err = -ENXIO; + goto out_mtd; + } + } + + /* Register the partitions */ + switch (omap_onenand_mtd->size) { + case SZ_128M: + case SZ_64M: + case SZ_32M: +#ifdef CONFIG_MTD_PARTITIONS + err = parse_mtd_partitions(omap_onenand_mtd, part_probes, + &dynamic_partition, 0); + if (err > 0) + err = add_mtd_partitions(omap_onenand_mtd, + dynamic_partition, err); + else if (1) + err = add_mtd_partitions(omap_onenand_mtd, + static_partition, + ARRAY_SIZE(static_partition)); + else +#endif + err = add_mtd_device(omap_onenand_mtd); + if (err) + goto out_buf; + break; + + default: + printk(KERN_WARNING "Unsupported OneNAND device\n"); + err = -ENXIO; + goto out_buf; + } + + return 0; + +out_buf: + onenand_release(omap_onenand_mtd); + iounmap(this->base); +out_mtd: + kfree(omap_onenand_mtd); +out: + return err; +} + +/* + * Clean up routine + */ +static void __exit omap_onenand_cleanup (void) +{ + struct onenand_chip *this = omap_onenand_mtd->priv; + + /* onenand_release frees MTD partitions, MTD structure + and onenand internal buffers */ + onenand_release(omap_onenand_mtd); + iounmap(this->base); + kfree(omap_onenand_mtd); +} + +module_init(omap_onenand_init); +module_exit(omap_onenand_cleanup); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); +MODULE_DESCRIPTION("Glue layer for OneNAND flash on OMAP boards"); diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c new file mode 100644 index 000000000000..bcce22ae3cb1 --- /dev/null +++ b/drivers/mtd/onenand/onenand_base.c @@ -0,0 +1,1462 @@ +/* + * linux/drivers/mtd/onenand/onenand_base.c + * + * Copyright (C) 2005 Samsung Electronics + * Kyungmin Park <kyungmin.park@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/onenand.h> +#include <linux/mtd/partitions.h> + +#include <asm/io.h> + +/** + * onenand_oob_64 - oob info for large (2KB) page + */ +static struct nand_oobinfo onenand_oob_64 = { + .useecc = MTD_NANDECC_AUTOPLACE, + .eccbytes = 20, + .eccpos = { + 8, 9, 10, 11, 12, + 24, 25, 26, 27, 28, + 40, 41, 42, 43, 44, + 56, 57, 58, 59, 60, + }, + .oobfree = { + {2, 3}, {14, 2}, {18, 3}, {30, 2}, + {24, 3}, {46, 2}, {40, 3}, {62, 2} } +}; + +/** + * onenand_oob_32 - oob info for middle (1KB) page + */ +static struct nand_oobinfo onenand_oob_32 = { + .useecc = MTD_NANDECC_AUTOPLACE, + .eccbytes = 10, + .eccpos = { + 8, 9, 10, 11, 12, + 24, 25, 26, 27, 28, + }, + .oobfree = { {2, 3}, {14, 2}, {18, 3}, {30, 2} } +}; + +static const unsigned char ffchars[] = { + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */ + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */ + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */ + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */ +}; + +/** + * onenand_readw - [OneNAND Interface] Read OneNAND register + * @param addr address to read + * + * Read OneNAND register + */ +static unsigned short onenand_readw(void __iomem *addr) +{ + return readw(addr); +} + +/** + * onenand_writew - [OneNAND Interface] Write OneNAND register with value + * @param value value to write + * @param addr address to write + * + * Write OneNAND register with value + */ +static void onenand_writew(unsigned short value, void __iomem *addr) +{ + writew(value, addr); +} + +/** + * onenand_block_address - [DEFAULT] Get block address + * @param device the device id + * @param block the block + * @return translated block address if DDP, otherwise same + * + * Setup Start Address 1 Register (F100h) + */ +static int onenand_block_address(int device, int block) +{ + if (device & ONENAND_DEVICE_IS_DDP) { + /* Device Flash Core select, NAND Flash Block Address */ + int dfs = 0, density, mask; + + density = device >> ONENAND_DEVICE_DENSITY_SHIFT; + mask = (1 << (density + 6)); + + if (block & mask) + dfs = 1; + + return (dfs << ONENAND_DDP_SHIFT) | (block & (mask - 1)); + } + + return block; +} + +/** + * onenand_bufferram_address - [DEFAULT] Get bufferram address + * @param device the device id + * @param block the block + * @return set DBS value if DDP, otherwise 0 + * + * Setup Start Address 2 Register (F101h) for DDP + */ +static int onenand_bufferram_address(int device, int block) +{ + if (device & ONENAND_DEVICE_IS_DDP) { + /* Device BufferRAM Select */ + int dbs = 0, density, mask; + + density = device >> ONENAND_DEVICE_DENSITY_SHIFT; + mask = (1 << (density + 6)); + + if (block & mask) + dbs = 1; + + return (dbs << ONENAND_DDP_SHIFT); + } + + return 0; +} + +/** + * onenand_page_address - [DEFAULT] Get page address + * @param page the page address + * @param sector the sector address + * @return combined page and sector address + * + * Setup Start Address 8 Register (F107h) + */ +static int onenand_page_address(int page, int sector) +{ + /* Flash Page Address, Flash Sector Address */ + int fpa, fsa; + + fpa = page & ONENAND_FPA_MASK; + fsa = sector & ONENAND_FSA_MASK; + + return ((fpa << ONENAND_FPA_SHIFT) | fsa); +} + +/** + * onenand_buffer_address - [DEFAULT] Get buffer address + * @param dataram1 DataRAM index + * @param sectors the sector address + * @param count the number of sectors + * @return the start buffer value + * + * Setup Start Buffer Register (F200h) + */ +static int onenand_buffer_address(int dataram1, int sectors, int count) +{ + int bsa, bsc; + + /* BufferRAM Sector Address */ + bsa = sectors & ONENAND_BSA_MASK; + + if (dataram1) + bsa |= ONENAND_BSA_DATARAM1; /* DataRAM1 */ + else + bsa |= ONENAND_BSA_DATARAM0; /* DataRAM0 */ + + /* BufferRAM Sector Count */ + bsc = count & ONENAND_BSC_MASK; + + return ((bsa << ONENAND_BSA_SHIFT) | bsc); +} + +/** + * onenand_command - [DEFAULT] Send command to OneNAND device + * @param mtd MTD device structure + * @param cmd the command to be sent + * @param addr offset to read from or write to + * @param len number of bytes to read or write + * + * Send command to OneNAND device. This function is used for middle/large page + * devices (1KB/2KB Bytes per page) + */ +static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len) +{ + struct onenand_chip *this = mtd->priv; + int value, readcmd = 0; + int block, page; + /* Now we use page size operation */ + int sectors = 4, count = 4; + + /* Address translation */ + switch (cmd) { + case ONENAND_CMD_UNLOCK: + case ONENAND_CMD_LOCK: + case ONENAND_CMD_LOCK_TIGHT: + block = -1; + page = -1; + break; + + case ONENAND_CMD_ERASE: + case ONENAND_CMD_BUFFERRAM: + block = (int) (addr >> this->erase_shift); + page = -1; + break; + + default: + block = (int) (addr >> this->erase_shift); + page = (int) (addr >> this->page_shift); + page &= this->page_mask; + break; + } + + /* NOTE: The setting order of the registers is very important! */ + if (cmd == ONENAND_CMD_BUFFERRAM) { + /* Select DataRAM for DDP */ + value = onenand_bufferram_address(this->device_id, block); + this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2); + + /* Switch to the next data buffer */ + ONENAND_SET_NEXT_BUFFERRAM(this); + + return 0; + } + + if (block != -1) { + /* Write 'DFS, FBA' of Flash */ + value = onenand_block_address(this->device_id, block); + this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1); + } + + if (page != -1) { + int dataram; + + switch (cmd) { + case ONENAND_CMD_READ: + case ONENAND_CMD_READOOB: + dataram = ONENAND_SET_NEXT_BUFFERRAM(this); + readcmd = 1; + break; + + default: + dataram = ONENAND_CURRENT_BUFFERRAM(this); + break; + } + + /* Write 'FPA, FSA' of Flash */ + value = onenand_page_address(page, sectors); + this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8); + + /* Write 'BSA, BSC' of DataRAM */ + value = onenand_buffer_address(dataram, sectors, count); + this->write_word(value, this->base + ONENAND_REG_START_BUFFER); + + if (readcmd) { + /* Select DataRAM for DDP */ + value = onenand_bufferram_address(this->device_id, block); + this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2); + } + } + + /* Interrupt clear */ + this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT); + + /* Write command */ + this->write_word(cmd, this->base + ONENAND_REG_COMMAND); + + return 0; +} + +/** + * onenand_wait - [DEFAULT] wait until the command is done + * @param mtd MTD device structure + * @param state state to select the max. timeout value + * + * Wait for command done. This applies to all OneNAND command + * Read can take up to 30us, erase up to 2ms and program up to 350us + * according to general OneNAND specs + */ +static int onenand_wait(struct mtd_info *mtd, int state) +{ + struct onenand_chip * this = mtd->priv; + unsigned long timeout; + unsigned int flags = ONENAND_INT_MASTER; + unsigned int interrupt = 0; + unsigned int ctrl, ecc; + + /* The 20 msec is enough */ + timeout = jiffies + msecs_to_jiffies(20); + while (time_before(jiffies, timeout)) { + interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT); + + if (interrupt & flags) + break; + + if (state != FL_READING) + cond_resched(); + } + /* To get correct interrupt status in timeout case */ + interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT); + + ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS); + + if (ctrl & ONENAND_CTRL_ERROR) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x", ctrl); + return -EIO; + } + + if (ctrl & ONENAND_CTRL_LOCK) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x", ctrl); + return -EIO; + } + + if (interrupt & ONENAND_INT_READ) { + ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS); + if (ecc & ONENAND_ECC_2BIT_ALL) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x", ecc); + return -EBADMSG; + } + } + + return 0; +} + +/** + * onenand_bufferram_offset - [DEFAULT] BufferRAM offset + * @param mtd MTD data structure + * @param area BufferRAM area + * @return offset given area + * + * Return BufferRAM offset given area + */ +static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area) +{ + struct onenand_chip *this = mtd->priv; + + if (ONENAND_CURRENT_BUFFERRAM(this)) { + if (area == ONENAND_DATARAM) + return mtd->oobblock; + if (area == ONENAND_SPARERAM) + return mtd->oobsize; + } + + return 0; +} + +/** + * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area + * @param mtd MTD data structure + * @param area BufferRAM area + * @param buffer the databuffer to put/get data + * @param offset offset to read from or write to + * @param count number of bytes to read/write + * + * Read the BufferRAM area + */ +static int onenand_read_bufferram(struct mtd_info *mtd, int area, + unsigned char *buffer, int offset, size_t count) +{ + struct onenand_chip *this = mtd->priv; + void __iomem *bufferram; + + bufferram = this->base + area; + + bufferram += onenand_bufferram_offset(mtd, area); + + memcpy(buffer, bufferram + offset, count); + + return 0; +} + +/** + * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area + * @param mtd MTD data structure + * @param area BufferRAM area + * @param buffer the databuffer to put/get data + * @param offset offset to read from or write to + * @param count number of bytes to read/write + * + * Write the BufferRAM area + */ +static int onenand_write_bufferram(struct mtd_info *mtd, int area, + const unsigned char *buffer, int offset, size_t count) +{ + struct onenand_chip *this = mtd->priv; + void __iomem *bufferram; + + bufferram = this->base + area; + + bufferram += onenand_bufferram_offset(mtd, area); + + memcpy(bufferram + offset, buffer, count); + + return 0; +} + +/** + * onenand_check_bufferram - [GENERIC] Check BufferRAM information + * @param mtd MTD data structure + * @param addr address to check + * @return 1 if there are valid data, otherwise 0 + * + * Check bufferram if there is data we required + */ +static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr) +{ + struct onenand_chip *this = mtd->priv; + int block, page; + int i; + + block = (int) (addr >> this->erase_shift); + page = (int) (addr >> this->page_shift); + page &= this->page_mask; + + i = ONENAND_CURRENT_BUFFERRAM(this); + + /* Is there valid data? */ + if (this->bufferram[i].block == block && + this->bufferram[i].page == page && + this->bufferram[i].valid) + return 1; + + return 0; +} + +/** + * onenand_update_bufferram - [GENERIC] Update BufferRAM information + * @param mtd MTD data structure + * @param addr address to update + * @param valid valid flag + * + * Update BufferRAM information + */ +static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr, + int valid) +{ + struct onenand_chip *this = mtd->priv; + int block, page; + int i; + + block = (int) (addr >> this->erase_shift); + page = (int) (addr >> this->page_shift); + page &= this->page_mask; + + /* Invalidate BufferRAM */ + for (i = 0; i < MAX_BUFFERRAM; i++) { + if (this->bufferram[i].block == block && + this->bufferram[i].page == page) + this->bufferram[i].valid = 0; + } + + /* Update BufferRAM */ + i = ONENAND_CURRENT_BUFFERRAM(this); + this->bufferram[i].block = block; + this->bufferram[i].page = page; + this->bufferram[i].valid = valid; + + return 0; +} + +/** + * onenand_get_device - [GENERIC] Get chip for selected access + * @param mtd MTD device structure + * @param new_state the state which is requested + * + * Get the device and lock it for exclusive access + */ +static void onenand_get_device(struct mtd_info *mtd, int new_state) +{ + struct onenand_chip *this = mtd->priv; + DECLARE_WAITQUEUE(wait, current); + + /* + * Grab the lock and see if the device is available + */ + while (1) { + spin_lock(&this->chip_lock); + if (this->state == FL_READY) { + this->state = new_state; + spin_unlock(&this->chip_lock); + break; + } + set_current_state(TASK_UNINTERRUPTIBLE); + add_wait_queue(&this->wq, &wait); + spin_unlock(&this->chip_lock); + schedule(); + remove_wait_queue(&this->wq, &wait); + } +} + +/** + * onenand_release_device - [GENERIC] release chip + * @param mtd MTD device structure + * + * Deselect, release chip lock and wake up anyone waiting on the device + */ +static void onenand_release_device(struct mtd_info *mtd) +{ + struct onenand_chip *this = mtd->priv; + + /* Release the chip */ + spin_lock(&this->chip_lock); + this->state = FL_READY; + wake_up(&this->wq); + spin_unlock(&this->chip_lock); +} + +/** + * onenand_read_ecc - [MTD Interface] Read data with ECC + * @param mtd MTD device structure + * @param from offset to read from + * @param len number of bytes to read + * @param retlen pointer to variable to store the number of read bytes + * @param buf the databuffer to put data + * @param oob_buf filesystem supplied oob data buffer + * @param oobsel oob selection structure + * + * OneNAND read with ECC + */ +static int onenand_read_ecc(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char *buf, + u_char *oob_buf, struct nand_oobinfo *oobsel) +{ + struct onenand_chip *this = mtd->priv; + int read = 0, column; + int thislen; + int ret = 0; + + DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ecc: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len); + + /* Do not allow reads past end of device */ + if ((from + len) > mtd->size) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: Attempt read beyond end of device\n"); + *retlen = 0; + return -EINVAL; + } + + /* Grab the lock and see if the device is available */ + onenand_get_device(mtd, FL_READING); + + /* TODO handling oob */ + + while (read < len) { + thislen = min_t(int, mtd->oobblock, len - read); + + column = from & (mtd->oobblock - 1); + if (column + thislen > mtd->oobblock) + thislen = mtd->oobblock - column; + + if (!onenand_check_bufferram(mtd, from)) { + this->command(mtd, ONENAND_CMD_READ, from, mtd->oobblock); + + ret = this->wait(mtd, FL_READING); + /* First copy data and check return value for ECC handling */ + onenand_update_bufferram(mtd, from, 1); + } + + this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen); + + read += thislen; + + if (read == len) + break; + + if (ret) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: read failed = %d\n", ret); + goto out; + } + + from += thislen; + buf += thislen; + } + +out: + /* Deselect and wake up anyone waiting on the device */ + onenand_release_device(mtd); + + /* + * Return success, if no ECC failures, else -EBADMSG + * fs driver will take care of that, because + * retlen == desired len and result == -EBADMSG + */ + *retlen = read; + return ret; +} + +/** + * onenand_read - [MTD Interface] MTD compability function for onenand_read_ecc + * @param mtd MTD device structure + * @param from offset to read from + * @param len number of bytes to read + * @param retlen pointer to variable to store the number of read bytes + * @param buf the databuffer to put data + * + * This function simply calls onenand_read_ecc with oob buffer and oobsel = NULL +*/ +static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char *buf) +{ + return onenand_read_ecc(mtd, from, len, retlen, buf, NULL, NULL); +} + +/** + * onenand_read_oob - [MTD Interface] OneNAND read out-of-band + * @param mtd MTD device structure + * @param from offset to read from + * @param len number of bytes to read + * @param retlen pointer to variable to store the number of read bytes + * @param buf the databuffer to put data + * + * OneNAND read out-of-band data from the spare area + */ +static int onenand_read_oob(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char *buf) +{ + struct onenand_chip *this = mtd->priv; + int read = 0, thislen, column; + int ret = 0; + + DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len); + + /* Initialize return length value */ + *retlen = 0; + + /* Do not allow reads past end of device */ + if (unlikely((from + len) > mtd->size)) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: Attempt read beyond end of device\n"); + return -EINVAL; + } + + /* Grab the lock and see if the device is available */ + onenand_get_device(mtd, FL_READING); + + column = from & (mtd->oobsize - 1); + + while (read < len) { + thislen = mtd->oobsize - column; + thislen = min_t(int, thislen, len); + + this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize); + + onenand_update_bufferram(mtd, from, 0); + + ret = this->wait(mtd, FL_READING); + /* First copy data and check return value for ECC handling */ + + this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen); + + read += thislen; + + if (read == len) + break; + + if (ret) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: read failed = %d\n", ret); + goto out; + } + + buf += thislen; + + /* Read more? */ + if (read < len) { + /* Page size */ + from += mtd->oobblock; + column = 0; + } + } + +out: + /* Deselect and wake up anyone waiting on the device */ + onenand_release_device(mtd); + + *retlen = read; + return ret; +} + +#ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE +/** + * onenand_verify_page - [GENERIC] verify the chip contents after a write + * @param mtd MTD device structure + * @param buf the databuffer to verify + * @param block block address + * @param page page address + * + * Check DataRAM area directly + */ +static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, + loff_t addr, int block, int page) +{ + struct onenand_chip *this = mtd->priv; + void __iomem *dataram0, *dataram1; + int ret = 0; + + this->command(mtd, ONENAND_CMD_READ, addr, mtd->oobblock); + + ret = this->wait(mtd, FL_READING); + if (ret) + return ret; + + onenand_update_bufferram(mtd, addr, 1); + + /* Check, if the two dataram areas are same */ + dataram0 = this->base + ONENAND_DATARAM; + dataram1 = dataram0 + mtd->oobblock; + + if (memcmp(dataram0, dataram1, mtd->oobblock)) + return -EBADMSG; + + return 0; +} +#else +#define onenand_verify_page(...) (0) +#endif + +#define NOTALIGNED(x) ((x & (mtd->oobblock - 1)) != 0) + +/** + * onenand_write_ecc - [MTD Interface] OneNAND write with ECC + * @param mtd MTD device structure + * @param to offset to write to + * @param len number of bytes to write + * @param retlen pointer to variable to store the number of written bytes + * @param buf the data to write + * @param eccbuf filesystem supplied oob data buffer + * @param oobsel oob selection structure + * + * OneNAND write with ECC + */ +static int onenand_write_ecc(struct mtd_info *mtd, loff_t to, size_t len, + size_t *retlen, const u_char *buf, + u_char *eccbuf, struct nand_oobinfo *oobsel) +{ + struct onenand_chip *this = mtd->priv; + int written = 0; + int ret = 0; + + DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ecc: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len); + + /* Initialize retlen, in case of early exit */ + *retlen = 0; + + /* Do not allow writes past end of device */ + if (unlikely((to + len) > mtd->size)) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt write to past end of device\n"); + return -EINVAL; + } + + /* Reject writes, which are not page aligned */ + if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt to write not page aligned data\n"); + return -EINVAL; + } + + /* Grab the lock and see if the device is available */ + onenand_get_device(mtd, FL_WRITING); + + /* Loop until all data write */ + while (written < len) { + int thislen = min_t(int, mtd->oobblock, len - written); + + this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock); + + this->write_bufferram(mtd, ONENAND_DATARAM, buf, 0, thislen); + this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize); + + this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock); + + onenand_update_bufferram(mtd, to, 1); + + ret = this->wait(mtd, FL_WRITING); + if (ret) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: write filaed %d\n", ret); + goto out; + } + + written += thislen; + + /* Only check verify write turn on */ + ret = onenand_verify_page(mtd, (u_char *) buf, to, block, page); + if (ret) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: verify failed %d\n", ret); + goto out; + } + + if (written == len) + break; + + to += thislen; + buf += thislen; + } + +out: + /* Deselect and wake up anyone waiting on the device */ + onenand_release_device(mtd); + + *retlen = written; + + return ret; +} + +/** + * onenand_write - [MTD Interface] compability function for onenand_write_ecc + * @param mtd MTD device structure + * @param to offset to write to + * @param len number of bytes to write + * @param retlen pointer to variable to store the number of written bytes + * @param buf the data to write + * + * This function simply calls onenand_write_ecc + * with oob buffer and oobsel = NULL + */ +static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len, + size_t *retlen, const u_char *buf) +{ + return onenand_write_ecc(mtd, to, len, retlen, buf, NULL, NULL); +} + +/** + * onenand_write_oob - [MTD Interface] OneNAND write out-of-band + * @param mtd MTD device structure + * @param to offset to write to + * @param len number of bytes to write + * @param retlen pointer to variable to store the number of written bytes + * @param buf the data to write + * + * OneNAND write out-of-band + */ +static int onenand_write_oob(struct mtd_info *mtd, loff_t to, size_t len, + size_t *retlen, const u_char *buf) +{ + struct onenand_chip *this = mtd->priv; + int column, status; + int written = 0; + + DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len); + + /* Initialize retlen, in case of early exit */ + *retlen = 0; + + /* Do not allow writes past end of device */ + if (unlikely((to + len) > mtd->size)) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: Attempt write to past end of device\n"); + return -EINVAL; + } + + /* Grab the lock and see if the device is available */ + onenand_get_device(mtd, FL_WRITING); + + /* Loop until all data write */ + while (written < len) { + int thislen = min_t(int, mtd->oobsize, len - written); + + column = to & (mtd->oobsize - 1); + + this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize); + + this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize); + this->write_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen); + + this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize); + + onenand_update_bufferram(mtd, to, 0); + + status = this->wait(mtd, FL_WRITING); + if (status) + goto out; + + written += thislen; + + if (written == len) + break; + + to += thislen; + buf += thislen; + } + +out: + /* Deselect and wake up anyone waiting on the device */ + onenand_release_device(mtd); + + *retlen = written; + + return 0; +} + +/** + * onenand_writev_ecc - [MTD Interface] write with iovec with ecc + * @param mtd MTD device structure + * @param vecs the iovectors to write + * @param count number of vectors + * @param to offset to write to + * @param retlen pointer to variable to store the number of written bytes + * @param eccbuf filesystem supplied oob data buffer + * @param oobsel oob selection structure + * + * OneNAND write with iovec with ecc + */ +static int onenand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs, + unsigned long count, loff_t to, size_t *retlen, + u_char *eccbuf, struct nand_oobinfo *oobsel) +{ + struct onenand_chip *this = mtd->priv; + unsigned char buffer[mtd->oobblock], *pbuf; + size_t total_len, len; + int i, written = 0; + int ret = 0; + + /* Preset written len for early exit */ + *retlen = 0; + + /* Calculate total length of data */ + total_len = 0; + for (i = 0; i < count; i++) + total_len += vecs[i].iov_len; + + DEBUG(MTD_DEBUG_LEVEL3, "onenand_writev_ecc: to = 0x%08x, len = %i, count = %ld\n", (unsigned int) to, (unsigned int) total_len, count); + + /* Do not allow write past end of the device */ + if (unlikely((to + total_len) > mtd->size)) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempted write past end of device\n"); + return -EINVAL; + } + + /* Reject writes, which are not page aligned */ + if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(total_len))) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempt to write not page aligned data\n"); + return -EINVAL; + } + + /* Grab the lock and see if the device is available */ + onenand_get_device(mtd, FL_WRITING); + + /* TODO handling oob */ + + /* Loop until all keve's data has been written */ + len = 0; + while (count) { + pbuf = buffer; + /* + * If the given tuple is >= pagesize then + * write it out from the iov + */ + if ((vecs->iov_len - len) >= mtd->oobblock) { + pbuf = vecs->iov_base + len; + + len += mtd->oobblock; + + /* Check, if we have to switch to the next tuple */ + if (len >= (int) vecs->iov_len) { + vecs++; + len = 0; + count--; + } + } else { + int cnt = 0, thislen; + while (cnt < mtd->oobblock) { + thislen = min_t(int, mtd->oobblock - cnt, vecs->iov_len - len); + memcpy(buffer + cnt, vecs->iov_base + len, thislen); + cnt += thislen; + len += thislen; + + /* Check, if we have to switch to the next tuple */ + if (len >= (int) vecs->iov_len) { + vecs++; + len = 0; + count--; + } + } + } + + this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock); + + this->write_bufferram(mtd, ONENAND_DATARAM, pbuf, 0, mtd->oobblock); + this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize); + + this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock); + + onenand_update_bufferram(mtd, to, 1); + + ret = this->wait(mtd, FL_WRITING); + if (ret) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: write failed %d\n", ret); + goto out; + } + + + /* Only check verify write turn on */ + ret = onenand_verify_page(mtd, (u_char *) pbuf, to, block, page); + if (ret) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: verify failed %d\n", ret); + goto out; + } + + written += mtd->oobblock; + + to += mtd->oobblock; + } + +out: + /* Deselect and wakt up anyone waiting on the device */ + onenand_release_device(mtd); + + *retlen = written; + + return 0; +} + +/** + * onenand_writev - [MTD Interface] compabilty function for onenand_writev_ecc + * @param mtd MTD device structure + * @param vecs the iovectors to write + * @param count number of vectors + * @param to offset to write to + * @param retlen pointer to variable to store the number of written bytes + * + * OneNAND write with kvec. This just calls the ecc function + */ +static int onenand_writev(struct mtd_info *mtd, const struct kvec *vecs, + unsigned long count, loff_t to, size_t *retlen) +{ + return onenand_writev_ecc(mtd, vecs, count, to, retlen, NULL, NULL); +} + +/** + * onenand_erase - [MTD Interface] erase block(s) + * @param mtd MTD device structure + * @param instr erase instruction + * + * Erase one ore more blocks + */ +static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr) +{ + struct onenand_chip *this = mtd->priv; + unsigned int block_size; + loff_t addr; + int len; + int ret = 0; + + DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len); + + block_size = (1 << this->erase_shift); + + /* Start address must align on block boundary */ + if (unlikely(instr->addr & (block_size - 1))) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Unaligned address\n"); + return -EINVAL; + } + + /* Length must align on block boundary */ + if (unlikely(instr->len & (block_size - 1))) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Length not block aligned\n"); + return -EINVAL; + } + + /* Do not allow erase past end of device */ + if (unlikely((instr->len + instr->addr) > mtd->size)) { + DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Erase past end of device\n"); + return -EINVAL; + } + + instr->fail_addr = 0xffffffff; + + /* Grab the lock and see if the device is available */ + onenand_get_device(mtd, FL_ERASING); + + /* Loop throught the pages */ + len = instr->len; + addr = instr->addr; + + instr->state = MTD_ERASING; + + while (len) { + + /* TODO Check badblock */ + + this->command(mtd, ONENAND_CMD_ERASE, addr, block_size); + + ret = this->wait(mtd, FL_ERASING); + /* Check, if it is write protected */ + if (ret) { + if (ret == -EPERM) + DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Device is write protected!!!\n"); + else + DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift)); + instr->state = MTD_ERASE_FAILED; + instr->fail_addr = addr; + goto erase_exit; + } + + len -= block_size; + addr += block_size; + } + + instr->state = MTD_ERASE_DONE; + +erase_exit: + + ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO; + /* Do call back function */ + if (!ret) + mtd_erase_callback(instr); + + /* Deselect and wake up anyone waiting on the device */ + onenand_release_device(mtd); + + return ret; +} + +/** + * onenand_sync - [MTD Interface] sync + * @param mtd MTD device structure + * + * Sync is actually a wait for chip ready function + */ +static void onenand_sync(struct mtd_info *mtd) +{ + DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n"); + + /* Grab the lock and see if the device is available */ + onenand_get_device(mtd, FL_SYNCING); + + /* Release it and go back */ + onenand_release_device(mtd); +} + +/** + * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad + * @param mtd MTD device structure + * @param ofs offset relative to mtd start + */ +static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs) +{ + /* + * TODO + * 1. Bad block table (BBT) + * -> using NAND BBT to support JFFS2 + * 2. Bad block management (BBM) + * -> bad block replace scheme + * + * Currently we do nothing + */ + return 0; +} + +/** + * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad + * @param mtd MTD device structure + * @param ofs offset relative to mtd start + */ +static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs) +{ + /* see above */ + return 0; +} + +/** + * onenand_unlock - [MTD Interface] Unlock block(s) + * @param mtd MTD device structure + * @param ofs offset relative to mtd start + * @param len number of bytes to unlock + * + * Unlock one or more blocks + */ +static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len) +{ + struct onenand_chip *this = mtd->priv; + int start, end, block, value, status; + + start = ofs >> this->erase_shift; + end = len >> this->erase_shift; + + /* Continuous lock scheme */ + if (this->options & ONENAND_CONT_LOCK) { + /* Set start block address */ + this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS); + /* Set end block address */ + this->write_word(end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS); + /* Write unlock command */ + this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0); + + /* There's no return value */ + this->wait(mtd, FL_UNLOCKING); + + /* Sanity check */ + while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS) + & ONENAND_CTRL_ONGO) + continue; + + /* Check lock status */ + status = this->read_word(this->base + ONENAND_REG_WP_STATUS); + if (!(status & ONENAND_WP_US)) + printk(KERN_ERR "wp status = 0x%x\n", status); + + return 0; + } + + /* Block lock scheme */ + for (block = start; block < end; block++) { + /* Set start block address */ + this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS); + /* Write unlock command */ + this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0); + + /* There's no return value */ + this->wait(mtd, FL_UNLOCKING); + + /* Sanity check */ + while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS) + & ONENAND_CTRL_ONGO) + continue; + + /* Set block address for read block status */ + value = onenand_block_address(this->device_id, block); + this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1); + + /* Check lock status */ + status = this->read_word(this->base + ONENAND_REG_WP_STATUS); + if (!(status & ONENAND_WP_US)) + printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status); + } + + return 0; +} + +/** + * onenand_print_device_info - Print device ID + * @param device device ID + * + * Print device ID + */ +static void onenand_print_device_info(int device) +{ + int vcc, demuxed, ddp, density; + + vcc = device & ONENAND_DEVICE_VCC_MASK; + demuxed = device & ONENAND_DEVICE_IS_DEMUX; + ddp = device & ONENAND_DEVICE_IS_DDP; + density = device >> ONENAND_DEVICE_DENSITY_SHIFT; + printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n", + demuxed ? "" : "Muxed ", + ddp ? "(DDP)" : "", + (16 << density), + vcc ? "2.65/3.3" : "1.8", + device); +} + +static const struct onenand_manufacturers onenand_manuf_ids[] = { + {ONENAND_MFR_SAMSUNG, "Samsung"}, + {ONENAND_MFR_UNKNOWN, "Unknown"} +}; + +/** + * onenand_check_maf - Check manufacturer ID + * @param manuf manufacturer ID + * + * Check manufacturer ID + */ +static int onenand_check_maf(int manuf) +{ + int i; + + for (i = 0; onenand_manuf_ids[i].id; i++) { + if (manuf == onenand_manuf_ids[i].id) + break; + } + + printk(KERN_DEBUG "OneNAND Manufacturer: %s\n", + onenand_manuf_ids[i].name); + + return (i != ONENAND_MFR_UNKNOWN); +} + +/** + * onenand_probe - [OneNAND Interface] Probe the OneNAND device + * @param mtd MTD device structure + * + * OneNAND detection method: + * Compare the the values from command with ones from register + */ +static int onenand_probe(struct mtd_info *mtd) +{ + struct onenand_chip *this = mtd->priv; + int bram_maf_id, bram_dev_id, maf_id, dev_id; + int version_id; + int density; + + /* Send the command for reading device ID from BootRAM */ + this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM); + + /* Read manufacturer and device IDs from BootRAM */ + bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0); + bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2); + + /* Check manufacturer ID */ + if (onenand_check_maf(bram_maf_id)) + return -ENXIO; + + /* Reset OneNAND to read default register values */ + this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM); + + /* Read manufacturer and device IDs from Register */ + maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID); + dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID); + + /* Check OneNAND device */ + if (maf_id != bram_maf_id || dev_id != bram_dev_id) + return -ENXIO; + + /* Flash device information */ + onenand_print_device_info(dev_id); + this->device_id = dev_id; + + density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT; + this->chipsize = (16 << density) << 20; + + /* OneNAND page size & block size */ + /* The data buffer size is equal to page size */ + mtd->oobblock = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE); + mtd->oobsize = mtd->oobblock >> 5; + /* Pagers per block is always 64 in OneNAND */ + mtd->erasesize = mtd->oobblock << 6; + + this->erase_shift = ffs(mtd->erasesize) - 1; + this->page_shift = ffs(mtd->oobblock) - 1; + this->ppb_shift = (this->erase_shift - this->page_shift); + this->page_mask = (mtd->erasesize / mtd->oobblock) - 1; + + /* REVIST: Multichip handling */ + + mtd->size = this->chipsize; + + /* Version ID */ + version_id = this->read_word(this->base + ONENAND_REG_VERSION_ID); + printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version_id); + + /* Lock scheme */ + if (density <= ONENAND_DEVICE_DENSITY_512Mb && + !(version_id >> ONENAND_VERSION_PROCESS_SHIFT)) { + printk(KERN_INFO "Lock scheme is Continues Lock\n"); + this->options |= ONENAND_CONT_LOCK; + } + + return 0; +} + + +/** + * onenand_scan - [OneNAND Interface] Scan for the OneNAND device + * @param mtd MTD device structure + * @param maxchips Number of chips to scan for + * + * This fills out all the not initialized function pointers + * with the defaults. + * The flash ID is read and the mtd/chip structures are + * filled with the appropriate values. + */ +int onenand_scan(struct mtd_info *mtd, int maxchips) +{ + struct onenand_chip *this = mtd->priv; + + if (!this->read_word) + this->read_word = onenand_readw; + if (!this->write_word) + this->write_word = onenand_writew; + + if (!this->command) + this->command = onenand_command; + if (!this->wait) + this->wait = onenand_wait; + + if (!this->read_bufferram) + this->read_bufferram = onenand_read_bufferram; + if (!this->write_bufferram) + this->write_bufferram = onenand_write_bufferram; + + if (onenand_probe(mtd)) + return -ENXIO; + + this->state = FL_READY; + init_waitqueue_head(&this->wq); + spin_lock_init(&this->chip_lock); + + switch (mtd->oobsize) { + case 64: + this->autooob = &onenand_oob_64; + break; + + case 32: + this->autooob = &onenand_oob_32; + break; + + default: + printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n", + mtd->oobsize); + /* To prevent kernel oops */ + this->autooob = &onenand_oob_32; + break; + } + + memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo)); + + /* Fill in remaining MTD driver data */ + mtd->type = MTD_NANDFLASH; + mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC; + mtd->ecctype = MTD_ECC_SW; + mtd->erase = onenand_erase; + mtd->point = NULL; + mtd->unpoint = NULL; + mtd->read = onenand_read; + mtd->write = onenand_write; + mtd->read_ecc = onenand_read_ecc; + mtd->write_ecc = onenand_write_ecc; + mtd->read_oob = onenand_read_oob; + mtd->write_oob = onenand_write_oob; + mtd->readv = NULL; + mtd->readv_ecc = NULL; + mtd->writev = onenand_writev; + mtd->writev_ecc = onenand_writev_ecc; + mtd->sync = onenand_sync; + mtd->lock = NULL; + mtd->unlock = onenand_unlock; + mtd->suspend = NULL; + mtd->resume = NULL; + mtd->block_isbad = onenand_block_isbad; + mtd->block_markbad = onenand_block_markbad; + mtd->owner = THIS_MODULE; + + /* Unlock whole block */ + mtd->unlock(mtd, 0x0, this->chipsize); + + return 0; +} + +/** + * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device + * @param mtd MTD device structure + */ +void onenand_release(struct mtd_info *mtd) +{ +#ifdef CONFIG_MTD_PARTITIONS + /* Deregister partitions */ + del_mtd_partitions (mtd); +#endif + /* Deregister the device */ + del_mtd_device (mtd); +} + +EXPORT_SYMBOL_GPL(onenand_scan); +EXPORT_SYMBOL_GPL(onenand_release); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); +MODULE_DESCRIPTION("Generic OneNAND flash driver code"); |