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[MTD] NAND: nandsim page-wise allocation (2/2)
For page wise allocation, an array of flash page pointers is allocated during initialization. The flash pages are themselves allocated when a write occurs to the page. The flash pages are deallocated when they are erased. Signed-off-by: Vijay Kumar <vijaykumar@bravegnu.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Vijay Kumar
David Woodhouse
parent
47e3774338
commit
d086d43640
@ -226,6 +226,14 @@ MODULE_PARM_DESC(dbg, "Output debug information if not zero");
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*/
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#define NS_MAX_PREVSTATES 1
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/*
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* A union to represent flash memory contents and flash buffer.
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*/
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union ns_mem {
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u_char *byte; /* for byte access */
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uint16_t *word; /* for 16-bit word access */
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};
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/*
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* The structure which describes all the internal simulator data.
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*/
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@ -243,17 +251,11 @@ struct nandsim {
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uint16_t npstates; /* number of previous states saved */
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uint16_t stateidx; /* current state index */
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/* The simulated NAND flash image */
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union flash_media {
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u_char *byte;
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uint16_t *word;
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} mem;
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/* The simulated NAND flash pages array */
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union ns_mem *pages;
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/* Internal buffer of page + OOB size bytes */
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union internal_buffer {
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u_char *byte; /* for byte access */
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uint16_t *word; /* for 16-bit word access */
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} buf;
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union ns_mem buf;
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/* NAND flash "geometry" */
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struct nandsin_geometry {
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@ -341,6 +343,46 @@ static struct mtd_info *nsmtd;
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static u_char ns_verify_buf[NS_LARGEST_PAGE_SIZE];
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/*
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* Allocate array of page pointers and initialize the array to NULL
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* pointers.
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*
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* RETURNS: 0 if success, -ENOMEM if memory alloc fails.
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*/
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static int
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alloc_device(struct nandsim *ns)
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{
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int i;
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ns->pages = vmalloc(ns->geom.pgnum * sizeof(union ns_mem));
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if (!ns->pages) {
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NS_ERR("alloc_map: unable to allocate page array\n");
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return -ENOMEM;
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}
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for (i = 0; i < ns->geom.pgnum; i++) {
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ns->pages[i].byte = NULL;
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}
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return 0;
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}
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/*
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* Free any allocated pages, and free the array of page pointers.
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*/
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static void
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free_device(struct nandsim *ns)
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{
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int i;
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if (ns->pages) {
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for (i = 0; i < ns->geom.pgnum; i++) {
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if (ns->pages[i].byte)
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kfree(ns->pages[i].byte);
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}
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vfree(ns->pages);
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}
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}
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/*
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* Initialize the nandsim structure.
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*
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@ -435,14 +477,8 @@ init_nandsim(struct mtd_info *mtd)
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printk("sector address bytes: %u\n", ns->geom.secaddrbytes);
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printk("options: %#x\n", ns->options);
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/* Map / allocate and initialize the flash image */
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ns->mem.byte = vmalloc(ns->geom.totszoob);
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if (!ns->mem.byte) {
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NS_ERR("init_nandsim: unable to allocate %u bytes for flash image\n",
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ns->geom.totszoob);
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return -ENOMEM;
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}
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memset(ns->mem.byte, 0xFF, ns->geom.totszoob);
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if (alloc_device(ns) != 0)
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goto error;
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/* Allocate / initialize the internal buffer */
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ns->buf.byte = kmalloc(ns->geom.pgszoob, GFP_KERNEL);
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@ -461,7 +497,7 @@ init_nandsim(struct mtd_info *mtd)
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return 0;
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error:
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vfree(ns->mem.byte);
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free_device(ns);
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return -ENOMEM;
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}
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@ -473,7 +509,7 @@ static void
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free_nandsim(struct nandsim *ns)
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{
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kfree(ns->buf.byte);
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vfree(ns->mem.byte);
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free_device(ns);
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return;
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}
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@ -768,6 +804,84 @@ find_operation(struct nandsim *ns, uint32_t flag)
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return -1;
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}
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/*
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* Returns a pointer to the current page.
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*/
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static inline union ns_mem *NS_GET_PAGE(struct nandsim *ns)
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{
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return &(ns->pages[ns->regs.row]);
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}
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/*
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* Retuns a pointer to the current byte, within the current page.
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*/
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static inline u_char *NS_PAGE_BYTE_OFF(struct nandsim *ns)
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{
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return NS_GET_PAGE(ns)->byte + ns->regs.column + ns->regs.off;
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}
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/*
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* Fill the NAND buffer with data read from the specified page.
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*/
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static void read_page(struct nandsim *ns, int num)
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{
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union ns_mem *mypage;
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mypage = NS_GET_PAGE(ns);
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if (mypage->byte == NULL) {
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NS_DBG("read_page: page %d not allocated\n", ns->regs.row);
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memset(ns->buf.byte, 0xFF, num);
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} else {
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NS_DBG("read_page: page %d allocated, reading from %d\n",
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ns->regs.row, ns->regs.column + ns->regs.off);
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memcpy(ns->buf.byte, NS_PAGE_BYTE_OFF(ns), num);
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}
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}
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/*
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* Erase all pages in the specified sector.
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*/
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static void erase_sector(struct nandsim *ns)
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{
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union ns_mem *mypage;
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int i;
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mypage = NS_GET_PAGE(ns);
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for (i = 0; i < ns->geom.pgsec; i++) {
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if (mypage->byte != NULL) {
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NS_DBG("erase_sector: freeing page %d\n", ns->regs.row+i);
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kfree(mypage->byte);
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mypage->byte = NULL;
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}
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mypage++;
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}
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}
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/*
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* Program the specified page with the contents from the NAND buffer.
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*/
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static int prog_page(struct nandsim *ns, int num)
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{
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union ns_mem *mypage;
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u_char *pg_off;
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mypage = NS_GET_PAGE(ns);
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if (mypage->byte == NULL) {
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NS_DBG("prog_page: allocating page %d\n", ns->regs.row);
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mypage->byte = kmalloc(ns->geom.pgszoob, GFP_KERNEL);
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if (mypage->byte == NULL) {
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NS_ERR("prog_page: error allocating memory for page %d\n", ns->regs.row);
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return -1;
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}
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memset(mypage->byte, 0xFF, ns->geom.pgszoob);
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}
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pg_off = NS_PAGE_BYTE_OFF(ns);
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memcpy(pg_off, ns->buf.byte, num);
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return 0;
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}
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/*
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* If state has any action bit, perform this action.
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*
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@ -776,7 +890,7 @@ find_operation(struct nandsim *ns, uint32_t flag)
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static int
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do_state_action(struct nandsim *ns, uint32_t action)
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{
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int i, num;
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int num;
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int busdiv = ns->busw == 8 ? 1 : 2;
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action &= ACTION_MASK;
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@ -800,7 +914,7 @@ do_state_action(struct nandsim *ns, uint32_t action)
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break;
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}
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num = ns->geom.pgszoob - ns->regs.off - ns->regs.column;
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memcpy(ns->buf.byte, ns->mem.byte + NS_RAW_OFFSET(ns) + ns->regs.off, num);
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read_page(ns, num);
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NS_DBG("do_state_action: (ACTION_CPY:) copy %d bytes to int buf, raw offset %d\n",
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num, NS_RAW_OFFSET(ns) + ns->regs.off);
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@ -841,7 +955,7 @@ do_state_action(struct nandsim *ns, uint32_t action)
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ns->regs.row, NS_RAW_OFFSET(ns));
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NS_LOG("erase sector %d\n", ns->regs.row >> (ns->geom.secshift - ns->geom.pgshift));
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memset(ns->mem.byte + NS_RAW_OFFSET(ns), 0xFF, ns->geom.secszoob);
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erase_sector(ns);
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NS_MDELAY(erase_delay);
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@ -864,8 +978,8 @@ do_state_action(struct nandsim *ns, uint32_t action)
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return -1;
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}
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for (i = 0; i < num; i++)
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ns->mem.byte[NS_RAW_OFFSET(ns) + ns->regs.off + i] &= ns->buf.byte[i];
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if (prog_page(ns, num) == -1)
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return -1;
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NS_DBG("do_state_action: copy %d bytes from int buf to (%#x, %#x), raw off = %d\n",
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num, ns->regs.row, ns->regs.column, NS_RAW_OFFSET(ns) + ns->regs.off);
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