--- /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 / linux-2.6-omap-h63xx.git / commitdiff