+++ /dev/null
-/*
- * linux/drivers/mtd/onenand/simulator.c
- *
- * The OneNAND simulator
- *
- * Copyright(c) 2005 Samsung Electronics
- * Kyungmin Park <kyungmin.park@samsung.com>
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/vmalloc.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/onenand.h>
-
-#include <asm/io.h>
-#include <asm/sizes.h>
-
-#ifndef CONFIG_ONENAND_SIM_MANUFACTURER
-#define CONFIG_ONENAND_SIM_MANUFACTURER 0xec
-#endif
-#ifndef CONFIG_ONENAND_SIM_DEVICE_ID
-#define CONFIG_ONENAND_SIM_DEVICE_ID 0x04
-#endif
-#ifndef CONFIG_ONENAND_SIM_VERSION_ID
-#define CONFIG_ONENAND_SIM_VERSION_ID 0x1e
-#endif
-
-static int manuf_id = CONFIG_ONENAND_SIM_MANUFACTURER;
-static int device_id = CONFIG_ONENAND_SIM_DEVICE_ID;
-static int version_id = CONFIG_ONENAND_SIM_VERSION_ID;
-
-struct onenand_flash {
- void __iomem *base;
- void __iomem *data;
-};
-
-#define ONENAND_CORE(flash) (flash->data)
-
-#define ONENAND_MAIN_AREA(this, offset) \
- (this->base + ONENAND_DATARAM + offset)
-
-#define ONENAND_SPARE_AREA(this, offset) \
- (this->base + ONENAND_SPARERAM + offset)
-
-#define ONENAND_GET_WP_STATUS(this) \
- (readw(this->base + ONENAND_REG_WP_STATUS))
-
-#define ONENAND_SET_WP_STATUS(v, this) \
- (writew(v, this->base + ONENAND_REG_WP_STATUS))
-
-/* It has all 0xff chars */
-static unsigned char *ffchars;
-
-/*
- * OneNAND simulator mtd
- */
-struct mtd_info *onenand_sim;
-
-
-/**
- * onenand_lock_handle - Handle Lock scheme
- * @param this OneNAND device structure
- * @param cmd The command to be sent
- *
- * Send lock command to OneNAND device.
- * The lock scheme is depends on chip type.
- */
-static void onenand_lock_handle(struct onenand_chip *this, int cmd)
-{
- int block_lock_scheme;
- int status;
-
- status = ONENAND_GET_WP_STATUS(this);
- block_lock_scheme = !(this->options & ONENAND_CONT_LOCK);
-
- switch (cmd) {
- case ONENAND_CMD_UNLOCK:
- if (block_lock_scheme)
- ONENAND_SET_WP_STATUS(ONENAND_WP_US, this);
- else
- ONENAND_SET_WP_STATUS(status | ONENAND_WP_US, this);
- break;
-
- case ONENAND_CMD_LOCK:
- if (block_lock_scheme)
- ONENAND_SET_WP_STATUS(ONENAND_WP_LS, this);
- else
- ONENAND_SET_WP_STATUS(status | ONENAND_WP_LS, this);
- break;
-
- case ONENAND_CMD_LOCK_TIGHT:
- if (block_lock_scheme)
- ONENAND_SET_WP_STATUS(ONENAND_WP_LTS, this);
- else
- ONENAND_SET_WP_STATUS(status | ONENAND_WP_LTS, this);
- break;
-
- default:
- break;
- }
-}
-
-/**
- * onenand_bootram_handle - Handle BootRAM area
- * @param this OneNAND device structure
- * @param cmd The command to be sent
- *
- * Emulate BootRAM area. It is possible to do basic operation using BootRAM.
- */
-static void onenand_bootram_handle(struct onenand_chip *this, int cmd)
-{
- switch (cmd) {
- case ONENAND_CMD_READID:
- writew(manuf_id, this->base);
- writew(device_id, this->base + 2);
- writew(version_id, this->base + 4);
- break;
-
- default:
- /* REVIST: Handle other commands */
- break;
- }
-}
-
-/**
- * onenand_update_interrupt - Set interrupt register
- * @param this OneNAND device structure
- * @param cmd The command to be sent
- *
- * Update interrupt register. The status is depends on command.
- */
-static void onenand_update_interrupt(struct onenand_chip *this, int cmd)
-{
- int interrupt = ONENAND_INT_MASTER;
-
- switch (cmd) {
- case ONENAND_CMD_READ:
- case ONENAND_CMD_READOOB:
- interrupt |= ONENAND_INT_READ;
- break;
-
- case ONENAND_CMD_PROG:
- case ONENAND_CMD_PROGOOB:
- interrupt |= ONENAND_INT_WRITE;
- break;
-
- case ONENAND_CMD_ERASE:
- interrupt |= ONENAND_INT_ERASE;
- break;
-
- case ONENAND_CMD_RESET:
- interrupt |= ONENAND_INT_RESET;
- break;
-
- default:
- break;
- }
-
- writew(interrupt, this->base + ONENAND_REG_INTERRUPT);
-}
-
-/**
- * onenand_check_overwrite - Check over-write if happend
- * @param dest The destination pointer
- * @param src The source pointer
- * @param count The length to be check
- * @return 0 on same, otherwise 1
- *
- * Compare the source with destination
- */
-static int onenand_check_overwrite(void *dest, void *src, size_t count)
-{
- unsigned int *s = (unsigned int *) src;
- unsigned int *d = (unsigned int *) dest;
- int i;
- count >>= 2;
-
- for (i = 0; i < count; i++)
- if ((*s++ ^ *d++) != 0)
- return 1;
-
- return 0;
-}
-
-/**
- * onenand_data_handle - Handle OneNAND Core and DataRAM
- * @param this OneNAND device structure
- * @param cmd The command to be sent
- * @param dataram Which dataram used
- * @param offset The offset to OneNAND Core
- *
- * Copy data from OneNAND Core to DataRAM (read)
- * Copy data from DataRAM to OneNAND Core (write)
- * Erase the OneNAND Core (erase)
- */
-static void onenand_data_handle(struct onenand_chip *this, int cmd,
- int dataram, unsigned int offset)
-{
- struct onenand_flash *flash = this->priv;
- int main_offset, spare_offset;
- void __iomem *src;
- void __iomem *dest;
-
- if (dataram) {
- main_offset = onenand_sim->oobblock;
- spare_offset = onenand_sim->oobsize;
- } else {
- main_offset = 0;
- spare_offset = 0;
- }
-
- switch (cmd) {
- case ONENAND_CMD_READ:
- src = ONENAND_CORE(flash) + offset;
- dest = ONENAND_MAIN_AREA(this, main_offset);
- memcpy(dest, src, onenand_sim->oobblock);
- /* Fall through */
-
- case ONENAND_CMD_READOOB:
- src = ONENAND_CORE(flash) + this->chipsize + (offset >> 5);
- dest = ONENAND_SPARE_AREA(this, spare_offset);
- memcpy(dest, src, onenand_sim->oobsize);
- break;
-
- case ONENAND_CMD_PROG:
- src = ONENAND_MAIN_AREA(this, main_offset);
- dest = ONENAND_CORE(flash) + offset;
- if (memcmp(dest, ffchars, onenand_sim->oobblock) &&
- onenand_check_overwrite(dest, src, onenand_sim->oobblock))
- printk(KERN_ERR "over-write happend at 0x%08x\n", offset);
- memcpy(dest, src, onenand_sim->oobblock);
- /* Fall through */
-
- case ONENAND_CMD_PROGOOB:
- src = ONENAND_SPARE_AREA(this, spare_offset);
- /* Check all data is 0xff chars */
- if (!memcmp(src, ffchars, onenand_sim->oobsize))
- break;
-
- dest = ONENAND_CORE(flash) + this->chipsize + (offset >> 5);
- if (memcmp(dest, ffchars, onenand_sim->oobsize) &&
- onenand_check_overwrite(dest, src, onenand_sim->oobsize))
- printk(KERN_ERR "OOB: over-write happend at 0x%08x\n", offset);
- memcpy(dest, src, onenand_sim->oobsize);
- break;
-
- case ONENAND_CMD_ERASE:
- memset(ONENAND_CORE(flash) + offset, 0xff, (1 << this->erase_shift));
- break;
-
- default:
- break;
- }
-}
-
-/**
- * onenand_command_handle - Handle command
- * @param this OneNAND device structure
- * @param cmd The command to be sent
- *
- * Emulate OneNAND command.
- */
-static void onenand_command_handle(struct onenand_chip *this, int cmd)
-{
- unsigned long offset = 0;
- int block = -1, page = -1, bufferram = -1;
- int dataram = 0;
-
- switch (cmd) {
- case ONENAND_CMD_UNLOCK:
- case ONENAND_CMD_LOCK:
- case ONENAND_CMD_LOCK_TIGHT:
- onenand_lock_handle(this, cmd);
- break;
-
- case ONENAND_CMD_BUFFERRAM:
- /* Do nothing */
- return;
-
- default:
- block = (int) readw(this->base + ONENAND_REG_START_ADDRESS1);
- if (block & (1 << ONENAND_DDP_SHIFT)) {
- block &= ~(1 << ONENAND_DDP_SHIFT);
- /* The half of chip block */
- block += this->chipsize >> (this->erase_shift + 1);
- }
- if (cmd == ONENAND_CMD_ERASE)
- break;
-
- page = (int) readw(this->base + ONENAND_REG_START_ADDRESS8);
- page = (page >> ONENAND_FPA_SHIFT);
- bufferram = (int) readw(this->base + ONENAND_REG_START_BUFFER);
- bufferram >>= ONENAND_BSA_SHIFT;
- bufferram &= ONENAND_BSA_DATARAM1;
- dataram = (bufferram == ONENAND_BSA_DATARAM1) ? 1 : 0;
- break;
- }
-
- if (block != -1)
- offset += block << this->erase_shift;
-
- if (page != -1)
- offset += page << this->page_shift;
-
- onenand_data_handle(this, cmd, dataram, offset);
-
- onenand_update_interrupt(this, cmd);
-}
-
-/**
- * onenand_writew - [OneNAND Interface] Emulate write operation
- * @param value value to write
- * @param addr address to write
- *
- * Write OneNAND reigser with value
- */
-static void onenand_writew(unsigned short value, void __iomem *addr)
-{
- struct onenand_chip *this = onenand_sim->priv;
-
- /* BootRAM handling */
- if (addr < this->base + ONENAND_DATARAM) {
- onenand_bootram_handle(this, value);
- return;
- }
- /* Command handling */
- if (addr == this->base + ONENAND_REG_COMMAND)
- onenand_command_handle(this, value);
-
- writew(value, addr);
-}
-
-/**
- * flash_init - Initialize OneNAND simulator
- * @param flash OneNAND simulaotr data strucutres
- *
- * Initialize OneNAND simulator.
- */
-static int __init flash_init(struct onenand_flash *flash)
-{
- int density, size;
- int buffer_size;
-
- flash->base = kmalloc(SZ_128K, GFP_KERNEL);
- if (!flash->base) {
- printk(KERN_ERR "Unalbe to allocate base address.\n");
- return -ENOMEM;
- }
-
- memset(flash->base, 0, SZ_128K);
-
- density = device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
- size = ((16 << 20) << density);
-
- ONENAND_CORE(flash) = vmalloc(size + (size >> 5));
- if (!ONENAND_CORE(flash)) {
- printk(KERN_ERR "Unalbe to allocate nand core address.\n");
- kfree(flash->base);
- return -ENOMEM;
- }
-
- memset(ONENAND_CORE(flash), 0xff, size + (size >> 5));
-
- /* Setup registers */
- writew(manuf_id, flash->base + ONENAND_REG_MANUFACTURER_ID);
- writew(device_id, flash->base + ONENAND_REG_DEVICE_ID);
- writew(version_id, flash->base + ONENAND_REG_VERSION_ID);
-
- if (density < 2)
- buffer_size = 0x0400; /* 1KB page */
- else
- buffer_size = 0x0800; /* 2KB page */
- writew(buffer_size, flash->base + ONENAND_REG_DATA_BUFFER_SIZE);
-
- return 0;
-}
-
-/**
- * flash_exit - Clean up OneNAND simulator
- * @param flash OneNAND simulaotr data strucutres
- *
- * Clean up OneNAND simulator.
- */
-static void flash_exit(struct onenand_flash *flash)
-{
- vfree(ONENAND_CORE(flash));
- kfree(flash->base);
- kfree(flash);
-}
-
-static int __init onenand_sim_init(void)
-{
- struct onenand_chip *this;
- struct onenand_flash *flash;
- int len;
-
- /* Allocate all 0xff chars pointer */
- ffchars = kmalloc(MAX_ONENAND_PAGESIZE, GFP_KERNEL);
- if (!ffchars) {
- printk(KERN_ERR "Unable to allocate ff chars.\n");
- return -ENOMEM;
- }
- memset(ffchars, 0xff, MAX_ONENAND_PAGESIZE);
-
- len = sizeof(struct mtd_info) + sizeof(struct onenand_chip) + sizeof (struct onenand_flash);
-
- /* Allocate OneNAND simulator mtd pointer */
- onenand_sim = kmalloc(len, GFP_KERNEL);
- if (!onenand_sim) {
- printk(KERN_ERR "Unable to allocate core structures.\n");
- kfree(ffchars);
- return -ENOMEM;
- }
-
- memset(onenand_sim, 0, len);
-
- this = (struct onenand_chip *) (onenand_sim + 1);
- /* Override write_word function */
- this->write_word = onenand_writew;
-
- flash = (struct onenand_flash *) (this + 1);
-
- if (flash_init(flash)) {
- printk(KERN_ERR "Unable to allocat flash.\n");
- kfree(ffchars);
- kfree(onenand_sim);
- return -ENOMEM;
- }
-
- this->base = flash->base;
- this->priv = flash;
- onenand_sim->priv = this;
-
- if (onenand_scan(onenand_sim, 1)) {
- kfree(ffchars);
- kfree(onenand_sim);
- flash_exit(flash);
- return -ENXIO;
- }
-
- add_mtd_device(onenand_sim);
-
- return 0;
-}
-
-static void __exit onenand_sim_exit(void)
-{
- struct onenand_chip *this = onenand_sim->priv;
- struct onenand_flash *flash = this->priv;
-
- kfree(ffchars);
- onenand_release(onenand_sim);
- flash_exit(flash);
- kfree(onenand_sim);
-}
-
-module_init(onenand_sim_init);
-module_exit(onenand_sim_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
-MODULE_DESCRIPTION("The OneNAND flash simulator");
projects / karo-tx-linux.git / commitdiff