![David Brownell](/assets/img/avatar_default.png)
Remove <linux/miscdevice.h> from various drivers which don't actually use any of its contents. There are still a number of these left in arch-specific bits of the tree. (Found by diffing results of "grep -rl" for linux/miscdevice.h and for misc_register, examining the differences, and verifying removals with a build test.) Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
1107 lines
31 KiB
C
1107 lines
31 KiB
C
/*
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* Linux driver for Disk-On-Chip Millennium Plus
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*
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* (c) 2002-2003 Greg Ungerer <gerg@snapgear.com>
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* (c) 2002-2003 SnapGear Inc
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* (c) 1999 Machine Vision Holdings, Inc.
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* (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
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*
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* Released under GPL
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/errno.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/doc2000.h>
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/* #define ECC_DEBUG */
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/* I have no idea why some DoC chips can not use memcop_form|to_io().
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* This may be due to the different revisions of the ASIC controller built-in or
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* simplily a QA/Bug issue. Who knows ?? If you have trouble, please uncomment
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* this:*/
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#undef USE_MEMCPY
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static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf);
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static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf);
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static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
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struct mtd_oob_ops *ops);
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static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
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struct mtd_oob_ops *ops);
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static int doc_erase (struct mtd_info *mtd, struct erase_info *instr);
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static struct mtd_info *docmilpluslist = NULL;
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/* Perform the required delay cycles by writing to the NOP register */
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static void DoC_Delay(void __iomem * docptr, int cycles)
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{
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int i;
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for (i = 0; (i < cycles); i++)
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WriteDOC(0, docptr, Mplus_NOP);
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}
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#define CDSN_CTRL_FR_B_MASK (CDSN_CTRL_FR_B0 | CDSN_CTRL_FR_B1)
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/* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
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static int _DoC_WaitReady(void __iomem * docptr)
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{
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unsigned int c = 0xffff;
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DEBUG(MTD_DEBUG_LEVEL3,
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"_DoC_WaitReady called for out-of-line wait\n");
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/* Out-of-line routine to wait for chip response */
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while (((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) && --c)
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;
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if (c == 0)
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DEBUG(MTD_DEBUG_LEVEL2, "_DoC_WaitReady timed out.\n");
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return (c == 0);
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}
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static inline int DoC_WaitReady(void __iomem * docptr)
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{
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/* This is inline, to optimise the common case, where it's ready instantly */
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int ret = 0;
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/* read form NOP register should be issued prior to the read from CDSNControl
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see Software Requirement 11.4 item 2. */
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DoC_Delay(docptr, 4);
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if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK)
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/* Call the out-of-line routine to wait */
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ret = _DoC_WaitReady(docptr);
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return ret;
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}
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/* For some reason the Millennium Plus seems to occassionally put itself
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* into reset mode. For me this happens randomly, with no pattern that I
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* can detect. M-systems suggest always check this on any block level
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* operation and setting to normal mode if in reset mode.
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*/
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static inline void DoC_CheckASIC(void __iomem * docptr)
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{
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/* Make sure the DoC is in normal mode */
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if ((ReadDOC(docptr, Mplus_DOCControl) & DOC_MODE_NORMAL) == 0) {
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WriteDOC((DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_DOCControl);
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WriteDOC(~(DOC_MODE_NORMAL | DOC_MODE_MDWREN), docptr, Mplus_CtrlConfirm);
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}
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}
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/* DoC_Command: Send a flash command to the flash chip through the Flash
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* command register. Need 2 Write Pipeline Terminates to complete send.
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*/
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static void DoC_Command(void __iomem * docptr, unsigned char command,
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unsigned char xtraflags)
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{
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WriteDOC(command, docptr, Mplus_FlashCmd);
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WriteDOC(command, docptr, Mplus_WritePipeTerm);
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WriteDOC(command, docptr, Mplus_WritePipeTerm);
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}
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/* DoC_Address: Set the current address for the flash chip through the Flash
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* Address register. Need 2 Write Pipeline Terminates to complete send.
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*/
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static inline void DoC_Address(struct DiskOnChip *doc, int numbytes,
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unsigned long ofs, unsigned char xtraflags1,
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unsigned char xtraflags2)
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{
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void __iomem * docptr = doc->virtadr;
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/* Allow for possible Mill Plus internal flash interleaving */
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ofs >>= doc->interleave;
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switch (numbytes) {
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case 1:
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/* Send single byte, bits 0-7. */
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WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
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break;
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case 2:
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/* Send bits 9-16 followed by 17-23 */
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WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress);
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WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
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break;
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case 3:
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/* Send 0-7, 9-16, then 17-23 */
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WriteDOC(ofs & 0xff, docptr, Mplus_FlashAddress);
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WriteDOC((ofs >> 9) & 0xff, docptr, Mplus_FlashAddress);
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WriteDOC((ofs >> 17) & 0xff, docptr, Mplus_FlashAddress);
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break;
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default:
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return;
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}
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WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
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WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
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}
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/* DoC_SelectChip: Select a given flash chip within the current floor */
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static int DoC_SelectChip(void __iomem * docptr, int chip)
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{
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/* No choice for flash chip on Millennium Plus */
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return 0;
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}
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/* DoC_SelectFloor: Select a given floor (bank of flash chips) */
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static int DoC_SelectFloor(void __iomem * docptr, int floor)
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{
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WriteDOC((floor & 0x3), docptr, Mplus_DeviceSelect);
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return 0;
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}
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/*
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* Translate the given offset into the appropriate command and offset.
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* This does the mapping using the 16bit interleave layout defined by
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* M-Systems, and looks like this for a sector pair:
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* +-----------+-------+-------+-------+--------------+---------+-----------+
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* | 0 --- 511 |512-517|518-519|520-521| 522 --- 1033 |1034-1039|1040 - 1055|
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* +-----------+-------+-------+-------+--------------+---------+-----------+
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* | Data 0 | ECC 0 |Flags0 |Flags1 | Data 1 |ECC 1 | OOB 1 + 2 |
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* +-----------+-------+-------+-------+--------------+---------+-----------+
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*/
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/* FIXME: This lives in INFTL not here. Other users of flash devices
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may not want it */
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static unsigned int DoC_GetDataOffset(struct mtd_info *mtd, loff_t *from)
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{
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struct DiskOnChip *this = mtd->priv;
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if (this->interleave) {
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unsigned int ofs = *from & 0x3ff;
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unsigned int cmd;
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if (ofs < 512) {
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cmd = NAND_CMD_READ0;
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ofs &= 0x1ff;
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} else if (ofs < 1014) {
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cmd = NAND_CMD_READ1;
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ofs = (ofs & 0x1ff) + 10;
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} else {
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cmd = NAND_CMD_READOOB;
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ofs = ofs - 1014;
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}
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*from = (*from & ~0x3ff) | ofs;
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return cmd;
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} else {
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/* No interleave */
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if ((*from) & 0x100)
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return NAND_CMD_READ1;
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return NAND_CMD_READ0;
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}
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}
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static unsigned int DoC_GetECCOffset(struct mtd_info *mtd, loff_t *from)
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{
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unsigned int ofs, cmd;
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if (*from & 0x200) {
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cmd = NAND_CMD_READOOB;
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ofs = 10 + (*from & 0xf);
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} else {
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cmd = NAND_CMD_READ1;
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ofs = (*from & 0xf);
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}
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*from = (*from & ~0x3ff) | ofs;
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return cmd;
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}
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static unsigned int DoC_GetFlagsOffset(struct mtd_info *mtd, loff_t *from)
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{
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unsigned int ofs, cmd;
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cmd = NAND_CMD_READ1;
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ofs = (*from & 0x200) ? 8 : 6;
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*from = (*from & ~0x3ff) | ofs;
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return cmd;
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}
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static unsigned int DoC_GetHdrOffset(struct mtd_info *mtd, loff_t *from)
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{
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unsigned int ofs, cmd;
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cmd = NAND_CMD_READOOB;
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ofs = (*from & 0x200) ? 24 : 16;
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*from = (*from & ~0x3ff) | ofs;
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return cmd;
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}
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static inline void MemReadDOC(void __iomem * docptr, unsigned char *buf, int len)
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{
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#ifndef USE_MEMCPY
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int i;
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for (i = 0; i < len; i++)
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buf[i] = ReadDOC(docptr, Mil_CDSN_IO + i);
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#else
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memcpy_fromio(buf, docptr + DoC_Mil_CDSN_IO, len);
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#endif
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}
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static inline void MemWriteDOC(void __iomem * docptr, unsigned char *buf, int len)
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{
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#ifndef USE_MEMCPY
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int i;
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for (i = 0; i < len; i++)
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WriteDOC(buf[i], docptr, Mil_CDSN_IO + i);
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#else
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memcpy_toio(docptr + DoC_Mil_CDSN_IO, buf, len);
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#endif
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}
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/* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
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static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
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{
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int mfr, id, i, j;
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volatile char dummy;
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void __iomem * docptr = doc->virtadr;
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/* Page in the required floor/chip */
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DoC_SelectFloor(docptr, floor);
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DoC_SelectChip(docptr, chip);
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/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
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WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
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/* Reset the chip, see Software Requirement 11.4 item 1. */
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DoC_Command(docptr, NAND_CMD_RESET, 0);
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DoC_WaitReady(docptr);
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/* Read the NAND chip ID: 1. Send ReadID command */
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DoC_Command(docptr, NAND_CMD_READID, 0);
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/* Read the NAND chip ID: 2. Send address byte zero */
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DoC_Address(doc, 1, 0x00, 0, 0x00);
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WriteDOC(0, docptr, Mplus_FlashControl);
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DoC_WaitReady(docptr);
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/* Read the manufacturer and device id codes of the flash device through
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CDSN IO register see Software Requirement 11.4 item 5.*/
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dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
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dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
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mfr = ReadDOC(docptr, Mil_CDSN_IO);
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if (doc->interleave)
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dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */
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id = ReadDOC(docptr, Mil_CDSN_IO);
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if (doc->interleave)
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dummy = ReadDOC(docptr, Mil_CDSN_IO); /* 2 way interleave */
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dummy = ReadDOC(docptr, Mplus_LastDataRead);
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dummy = ReadDOC(docptr, Mplus_LastDataRead);
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/* Disable flash internally */
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WriteDOC(0, docptr, Mplus_FlashSelect);
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/* No response - return failure */
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if (mfr == 0xff || mfr == 0)
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return 0;
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for (i = 0; nand_flash_ids[i].name != NULL; i++) {
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if (id == nand_flash_ids[i].id) {
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/* Try to identify manufacturer */
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for (j = 0; nand_manuf_ids[j].id != 0x0; j++) {
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if (nand_manuf_ids[j].id == mfr)
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break;
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}
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printk(KERN_INFO "Flash chip found: Manufacturer ID: %2.2X, "
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"Chip ID: %2.2X (%s:%s)\n", mfr, id,
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nand_manuf_ids[j].name, nand_flash_ids[i].name);
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doc->mfr = mfr;
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doc->id = id;
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doc->chipshift = ffs((nand_flash_ids[i].chipsize << 20)) - 1;
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doc->erasesize = nand_flash_ids[i].erasesize << doc->interleave;
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break;
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}
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}
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if (nand_flash_ids[i].name == NULL)
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return 0;
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return 1;
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}
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/* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
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static void DoC_ScanChips(struct DiskOnChip *this)
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{
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int floor, chip;
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int numchips[MAX_FLOORS_MPLUS];
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int ret;
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this->numchips = 0;
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this->mfr = 0;
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this->id = 0;
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/* Work out the intended interleave setting */
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this->interleave = 0;
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if (this->ChipID == DOC_ChipID_DocMilPlus32)
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this->interleave = 1;
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/* Check the ASIC agrees */
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if ( (this->interleave << 2) !=
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(ReadDOC(this->virtadr, Mplus_Configuration) & 4)) {
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u_char conf = ReadDOC(this->virtadr, Mplus_Configuration);
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printk(KERN_NOTICE "Setting DiskOnChip Millennium Plus interleave to %s\n",
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this->interleave?"on (16-bit)":"off (8-bit)");
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conf ^= 4;
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WriteDOC(conf, this->virtadr, Mplus_Configuration);
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}
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/* For each floor, find the number of valid chips it contains */
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for (floor = 0,ret = 1; floor < MAX_FLOORS_MPLUS; floor++) {
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numchips[floor] = 0;
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for (chip = 0; chip < MAX_CHIPS_MPLUS && ret != 0; chip++) {
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ret = DoC_IdentChip(this, floor, chip);
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if (ret) {
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numchips[floor]++;
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this->numchips++;
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}
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}
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}
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/* If there are none at all that we recognise, bail */
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if (!this->numchips) {
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printk("No flash chips recognised.\n");
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return;
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}
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/* Allocate an array to hold the information for each chip */
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this->chips = kmalloc(sizeof(struct Nand) * this->numchips, GFP_KERNEL);
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if (!this->chips){
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printk("MTD: No memory for allocating chip info structures\n");
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return;
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}
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/* Fill out the chip array with {floor, chipno} for each
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* detected chip in the device. */
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for (floor = 0, ret = 0; floor < MAX_FLOORS_MPLUS; floor++) {
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for (chip = 0 ; chip < numchips[floor] ; chip++) {
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this->chips[ret].floor = floor;
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this->chips[ret].chip = chip;
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this->chips[ret].curadr = 0;
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this->chips[ret].curmode = 0x50;
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ret++;
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}
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}
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/* Calculate and print the total size of the device */
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this->totlen = this->numchips * (1 << this->chipshift);
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printk(KERN_INFO "%d flash chips found. Total DiskOnChip size: %ld MiB\n",
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this->numchips ,this->totlen >> 20);
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}
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static int DoCMilPlus_is_alias(struct DiskOnChip *doc1, struct DiskOnChip *doc2)
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{
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int tmp1, tmp2, retval;
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if (doc1->physadr == doc2->physadr)
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return 1;
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/* Use the alias resolution register which was set aside for this
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* purpose. If it's value is the same on both chips, they might
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* be the same chip, and we write to one and check for a change in
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* the other. It's unclear if this register is usuable in the
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* DoC 2000 (it's in the Millennium docs), but it seems to work. */
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tmp1 = ReadDOC(doc1->virtadr, Mplus_AliasResolution);
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tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);
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if (tmp1 != tmp2)
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return 0;
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WriteDOC((tmp1+1) % 0xff, doc1->virtadr, Mplus_AliasResolution);
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tmp2 = ReadDOC(doc2->virtadr, Mplus_AliasResolution);
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if (tmp2 == (tmp1+1) % 0xff)
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retval = 1;
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else
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retval = 0;
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/* Restore register contents. May not be necessary, but do it just to
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* be safe. */
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WriteDOC(tmp1, doc1->virtadr, Mplus_AliasResolution);
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return retval;
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}
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/* This routine is found from the docprobe code by symbol_get(),
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* which will bump the use count of this module. */
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void DoCMilPlus_init(struct mtd_info *mtd)
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{
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struct DiskOnChip *this = mtd->priv;
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struct DiskOnChip *old = NULL;
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/* We must avoid being called twice for the same device. */
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if (docmilpluslist)
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old = docmilpluslist->priv;
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while (old) {
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if (DoCMilPlus_is_alias(this, old)) {
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printk(KERN_NOTICE "Ignoring DiskOnChip Millennium "
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"Plus at 0x%lX - already configured\n",
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this->physadr);
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iounmap(this->virtadr);
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kfree(mtd);
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return;
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}
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if (old->nextdoc)
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old = old->nextdoc->priv;
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else
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old = NULL;
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}
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mtd->name = "DiskOnChip Millennium Plus";
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printk(KERN_NOTICE "DiskOnChip Millennium Plus found at "
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"address 0x%lX\n", this->physadr);
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mtd->type = MTD_NANDFLASH;
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mtd->flags = MTD_CAP_NANDFLASH;
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mtd->size = 0;
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|
|
mtd->erasesize = 0;
|
|
mtd->writesize = 512;
|
|
mtd->oobsize = 16;
|
|
mtd->owner = THIS_MODULE;
|
|
mtd->erase = doc_erase;
|
|
mtd->point = NULL;
|
|
mtd->unpoint = NULL;
|
|
mtd->read = doc_read;
|
|
mtd->write = doc_write;
|
|
mtd->read_oob = doc_read_oob;
|
|
mtd->write_oob = doc_write_oob;
|
|
mtd->sync = NULL;
|
|
|
|
this->totlen = 0;
|
|
this->numchips = 0;
|
|
this->curfloor = -1;
|
|
this->curchip = -1;
|
|
|
|
/* Ident all the chips present. */
|
|
DoC_ScanChips(this);
|
|
|
|
if (!this->totlen) {
|
|
kfree(mtd);
|
|
iounmap(this->virtadr);
|
|
} else {
|
|
this->nextdoc = docmilpluslist;
|
|
docmilpluslist = mtd;
|
|
mtd->size = this->totlen;
|
|
mtd->erasesize = this->erasesize;
|
|
add_mtd_device(mtd);
|
|
return;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(DoCMilPlus_init);
|
|
|
|
#if 0
|
|
static int doc_dumpblk(struct mtd_info *mtd, loff_t from)
|
|
{
|
|
int i;
|
|
loff_t fofs;
|
|
struct DiskOnChip *this = mtd->priv;
|
|
void __iomem * docptr = this->virtadr;
|
|
struct Nand *mychip = &this->chips[from >> (this->chipshift)];
|
|
unsigned char *bp, buf[1056];
|
|
char c[32];
|
|
|
|
from &= ~0x3ff;
|
|
|
|
/* Don't allow read past end of device */
|
|
if (from >= this->totlen)
|
|
return -EINVAL;
|
|
|
|
DoC_CheckASIC(docptr);
|
|
|
|
/* Find the chip which is to be used and select it */
|
|
if (this->curfloor != mychip->floor) {
|
|
DoC_SelectFloor(docptr, mychip->floor);
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
} else if (this->curchip != mychip->chip) {
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
}
|
|
this->curfloor = mychip->floor;
|
|
this->curchip = mychip->chip;
|
|
|
|
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
|
|
WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
|
|
|
|
/* Reset the chip, see Software Requirement 11.4 item 1. */
|
|
DoC_Command(docptr, NAND_CMD_RESET, 0);
|
|
DoC_WaitReady(docptr);
|
|
|
|
fofs = from;
|
|
DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
|
|
DoC_Address(this, 3, fofs, 0, 0x00);
|
|
WriteDOC(0, docptr, Mplus_FlashControl);
|
|
DoC_WaitReady(docptr);
|
|
|
|
/* disable the ECC engine */
|
|
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
|
|
|
|
ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
|
|
/* Read the data via the internal pipeline through CDSN IO
|
|
register, see Pipelined Read Operations 11.3 */
|
|
MemReadDOC(docptr, buf, 1054);
|
|
buf[1054] = ReadDOC(docptr, Mplus_LastDataRead);
|
|
buf[1055] = ReadDOC(docptr, Mplus_LastDataRead);
|
|
|
|
memset(&c[0], 0, sizeof(c));
|
|
printk("DUMP OFFSET=%x:\n", (int)from);
|
|
|
|
for (i = 0, bp = &buf[0]; (i < 1056); i++) {
|
|
if ((i % 16) == 0)
|
|
printk("%08x: ", i);
|
|
printk(" %02x", *bp);
|
|
c[(i & 0xf)] = ((*bp >= 0x20) && (*bp <= 0x7f)) ? *bp : '.';
|
|
bp++;
|
|
if (((i + 1) % 16) == 0)
|
|
printk(" %s\n", c);
|
|
}
|
|
printk("\n");
|
|
|
|
/* Disable flash internally */
|
|
WriteDOC(0, docptr, Mplus_FlashSelect);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
|
|
size_t *retlen, u_char *buf)
|
|
{
|
|
int ret, i;
|
|
volatile char dummy;
|
|
loff_t fofs;
|
|
unsigned char syndrome[6], eccbuf[6];
|
|
struct DiskOnChip *this = mtd->priv;
|
|
void __iomem * docptr = this->virtadr;
|
|
struct Nand *mychip = &this->chips[from >> (this->chipshift)];
|
|
|
|
/* Don't allow read past end of device */
|
|
if (from >= this->totlen)
|
|
return -EINVAL;
|
|
|
|
/* Don't allow a single read to cross a 512-byte block boundary */
|
|
if (from + len > ((from | 0x1ff) + 1))
|
|
len = ((from | 0x1ff) + 1) - from;
|
|
|
|
DoC_CheckASIC(docptr);
|
|
|
|
/* Find the chip which is to be used and select it */
|
|
if (this->curfloor != mychip->floor) {
|
|
DoC_SelectFloor(docptr, mychip->floor);
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
} else if (this->curchip != mychip->chip) {
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
}
|
|
this->curfloor = mychip->floor;
|
|
this->curchip = mychip->chip;
|
|
|
|
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
|
|
WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
|
|
|
|
/* Reset the chip, see Software Requirement 11.4 item 1. */
|
|
DoC_Command(docptr, NAND_CMD_RESET, 0);
|
|
DoC_WaitReady(docptr);
|
|
|
|
fofs = from;
|
|
DoC_Command(docptr, DoC_GetDataOffset(mtd, &fofs), 0);
|
|
DoC_Address(this, 3, fofs, 0, 0x00);
|
|
WriteDOC(0, docptr, Mplus_FlashControl);
|
|
DoC_WaitReady(docptr);
|
|
|
|
/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
|
|
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
|
|
WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf);
|
|
|
|
/* Let the caller know we completed it */
|
|
*retlen = len;
|
|
ret = 0;
|
|
|
|
ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
|
|
/* Read the data via the internal pipeline through CDSN IO
|
|
register, see Pipelined Read Operations 11.3 */
|
|
MemReadDOC(docptr, buf, len);
|
|
|
|
/* Read the ECC data following raw data */
|
|
MemReadDOC(docptr, eccbuf, 4);
|
|
eccbuf[4] = ReadDOC(docptr, Mplus_LastDataRead);
|
|
eccbuf[5] = ReadDOC(docptr, Mplus_LastDataRead);
|
|
|
|
/* Flush the pipeline */
|
|
dummy = ReadDOC(docptr, Mplus_ECCConf);
|
|
dummy = ReadDOC(docptr, Mplus_ECCConf);
|
|
|
|
/* Check the ECC Status */
|
|
if (ReadDOC(docptr, Mplus_ECCConf) & 0x80) {
|
|
int nb_errors;
|
|
/* There was an ECC error */
|
|
#ifdef ECC_DEBUG
|
|
printk("DiskOnChip ECC Error: Read at %lx\n", (long)from);
|
|
#endif
|
|
/* Read the ECC syndrom through the DiskOnChip ECC logic.
|
|
These syndrome will be all ZERO when there is no error */
|
|
for (i = 0; i < 6; i++)
|
|
syndrome[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);
|
|
|
|
nb_errors = doc_decode_ecc(buf, syndrome);
|
|
#ifdef ECC_DEBUG
|
|
printk("ECC Errors corrected: %x\n", nb_errors);
|
|
#endif
|
|
if (nb_errors < 0) {
|
|
/* We return error, but have actually done the
|
|
read. Not that this can be told to user-space, via
|
|
sys_read(), but at least MTD-aware stuff can know
|
|
about it by checking *retlen */
|
|
#ifdef ECC_DEBUG
|
|
printk("%s(%d): Millennium Plus ECC error (from=0x%x:\n",
|
|
__FILE__, __LINE__, (int)from);
|
|
printk(" syndrome= %02x:%02x:%02x:%02x:%02x:"
|
|
"%02x\n",
|
|
syndrome[0], syndrome[1], syndrome[2],
|
|
syndrome[3], syndrome[4], syndrome[5]);
|
|
printk(" eccbuf= %02x:%02x:%02x:%02x:%02x:"
|
|
"%02x\n",
|
|
eccbuf[0], eccbuf[1], eccbuf[2],
|
|
eccbuf[3], eccbuf[4], eccbuf[5]);
|
|
#endif
|
|
ret = -EIO;
|
|
}
|
|
}
|
|
|
|
#ifdef PSYCHO_DEBUG
|
|
printk("ECC DATA at %lx: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
|
|
(long)from, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
|
|
eccbuf[4], eccbuf[5]);
|
|
#endif
|
|
/* disable the ECC engine */
|
|
WriteDOC(DOC_ECC_DIS, docptr , Mplus_ECCConf);
|
|
|
|
/* Disable flash internally */
|
|
WriteDOC(0, docptr, Mplus_FlashSelect);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
|
|
size_t *retlen, const u_char *buf)
|
|
{
|
|
int i, before, ret = 0;
|
|
loff_t fto;
|
|
volatile char dummy;
|
|
char eccbuf[6];
|
|
struct DiskOnChip *this = mtd->priv;
|
|
void __iomem * docptr = this->virtadr;
|
|
struct Nand *mychip = &this->chips[to >> (this->chipshift)];
|
|
|
|
/* Don't allow write past end of device */
|
|
if (to >= this->totlen)
|
|
return -EINVAL;
|
|
|
|
/* Don't allow writes which aren't exactly one block (512 bytes) */
|
|
if ((to & 0x1ff) || (len != 0x200))
|
|
return -EINVAL;
|
|
|
|
/* Determine position of OOB flags, before or after data */
|
|
before = (this->interleave && (to & 0x200));
|
|
|
|
DoC_CheckASIC(docptr);
|
|
|
|
/* Find the chip which is to be used and select it */
|
|
if (this->curfloor != mychip->floor) {
|
|
DoC_SelectFloor(docptr, mychip->floor);
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
} else if (this->curchip != mychip->chip) {
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
}
|
|
this->curfloor = mychip->floor;
|
|
this->curchip = mychip->chip;
|
|
|
|
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
|
|
WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
|
|
|
|
/* Reset the chip, see Software Requirement 11.4 item 1. */
|
|
DoC_Command(docptr, NAND_CMD_RESET, 0);
|
|
DoC_WaitReady(docptr);
|
|
|
|
/* Set device to appropriate plane of flash */
|
|
fto = to;
|
|
WriteDOC(DoC_GetDataOffset(mtd, &fto), docptr, Mplus_FlashCmd);
|
|
|
|
/* On interleaved devices the flags for 2nd half 512 are before data */
|
|
if (before)
|
|
fto -= 2;
|
|
|
|
/* issue the Serial Data In command to initial the Page Program process */
|
|
DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
|
|
DoC_Address(this, 3, fto, 0x00, 0x00);
|
|
|
|
/* Disable the ECC engine */
|
|
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
|
|
|
|
if (before) {
|
|
/* Write the block status BLOCK_USED (0x5555) */
|
|
WriteDOC(0x55, docptr, Mil_CDSN_IO);
|
|
WriteDOC(0x55, docptr, Mil_CDSN_IO);
|
|
}
|
|
|
|
/* init the ECC engine, see Reed-Solomon EDC/ECC 11.1 .*/
|
|
WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, Mplus_ECCConf);
|
|
|
|
MemWriteDOC(docptr, (unsigned char *) buf, len);
|
|
|
|
/* Write ECC data to flash, the ECC info is generated by
|
|
the DiskOnChip ECC logic see Reed-Solomon EDC/ECC 11.1 */
|
|
DoC_Delay(docptr, 3);
|
|
|
|
/* Read the ECC data through the DiskOnChip ECC logic */
|
|
for (i = 0; i < 6; i++)
|
|
eccbuf[i] = ReadDOC(docptr, Mplus_ECCSyndrome0 + i);
|
|
|
|
/* disable the ECC engine */
|
|
WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
|
|
|
|
/* Write the ECC data to flash */
|
|
MemWriteDOC(docptr, eccbuf, 6);
|
|
|
|
if (!before) {
|
|
/* Write the block status BLOCK_USED (0x5555) */
|
|
WriteDOC(0x55, docptr, Mil_CDSN_IO+6);
|
|
WriteDOC(0x55, docptr, Mil_CDSN_IO+7);
|
|
}
|
|
|
|
#ifdef PSYCHO_DEBUG
|
|
printk("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
|
|
(long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
|
|
eccbuf[4], eccbuf[5]);
|
|
#endif
|
|
|
|
WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
|
|
WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
|
|
|
|
/* Commit the Page Program command and wait for ready
|
|
see Software Requirement 11.4 item 1.*/
|
|
DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
|
|
DoC_WaitReady(docptr);
|
|
|
|
/* Read the status of the flash device through CDSN IO register
|
|
see Software Requirement 11.4 item 5.*/
|
|
DoC_Command(docptr, NAND_CMD_STATUS, 0);
|
|
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
DoC_Delay(docptr, 2);
|
|
if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
|
|
printk("MTD: Error 0x%x programming at 0x%x\n", dummy, (int)to);
|
|
/* Error in programming
|
|
FIXME: implement Bad Block Replacement (in nftl.c ??) */
|
|
*retlen = 0;
|
|
ret = -EIO;
|
|
}
|
|
dummy = ReadDOC(docptr, Mplus_LastDataRead);
|
|
|
|
/* Disable flash internally */
|
|
WriteDOC(0, docptr, Mplus_FlashSelect);
|
|
|
|
/* Let the caller know we completed it */
|
|
*retlen = len;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int doc_read_oob(struct mtd_info *mtd, loff_t ofs,
|
|
struct mtd_oob_ops *ops)
|
|
{
|
|
loff_t fofs, base;
|
|
struct DiskOnChip *this = mtd->priv;
|
|
void __iomem * docptr = this->virtadr;
|
|
struct Nand *mychip = &this->chips[ofs >> this->chipshift];
|
|
size_t i, size, got, want;
|
|
uint8_t *buf = ops->oobbuf;
|
|
size_t len = ops->len;
|
|
|
|
BUG_ON(ops->mode != MTD_OOB_PLACE);
|
|
|
|
ofs += ops->ooboffs;
|
|
|
|
DoC_CheckASIC(docptr);
|
|
|
|
/* Find the chip which is to be used and select it */
|
|
if (this->curfloor != mychip->floor) {
|
|
DoC_SelectFloor(docptr, mychip->floor);
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
} else if (this->curchip != mychip->chip) {
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
}
|
|
this->curfloor = mychip->floor;
|
|
this->curchip = mychip->chip;
|
|
|
|
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
|
|
WriteDOC((DOC_FLASH_CE | DOC_FLASH_WP), docptr, Mplus_FlashSelect);
|
|
|
|
/* disable the ECC engine */
|
|
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
|
|
DoC_WaitReady(docptr);
|
|
|
|
/* Maximum of 16 bytes in the OOB region, so limit read to that */
|
|
if (len > 16)
|
|
len = 16;
|
|
got = 0;
|
|
want = len;
|
|
|
|
for (i = 0; ((i < 3) && (want > 0)); i++) {
|
|
/* Figure out which region we are accessing... */
|
|
fofs = ofs;
|
|
base = ofs & 0xf;
|
|
if (!this->interleave) {
|
|
DoC_Command(docptr, NAND_CMD_READOOB, 0);
|
|
size = 16 - base;
|
|
} else if (base < 6) {
|
|
DoC_Command(docptr, DoC_GetECCOffset(mtd, &fofs), 0);
|
|
size = 6 - base;
|
|
} else if (base < 8) {
|
|
DoC_Command(docptr, DoC_GetFlagsOffset(mtd, &fofs), 0);
|
|
size = 8 - base;
|
|
} else {
|
|
DoC_Command(docptr, DoC_GetHdrOffset(mtd, &fofs), 0);
|
|
size = 16 - base;
|
|
}
|
|
if (size > want)
|
|
size = want;
|
|
|
|
/* Issue read command */
|
|
DoC_Address(this, 3, fofs, 0, 0x00);
|
|
WriteDOC(0, docptr, Mplus_FlashControl);
|
|
DoC_WaitReady(docptr);
|
|
|
|
ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
MemReadDOC(docptr, &buf[got], size - 2);
|
|
buf[got + size - 2] = ReadDOC(docptr, Mplus_LastDataRead);
|
|
buf[got + size - 1] = ReadDOC(docptr, Mplus_LastDataRead);
|
|
|
|
ofs += size;
|
|
got += size;
|
|
want -= size;
|
|
}
|
|
|
|
/* Disable flash internally */
|
|
WriteDOC(0, docptr, Mplus_FlashSelect);
|
|
|
|
ops->retlen = len;
|
|
return 0;
|
|
}
|
|
|
|
static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
|
|
struct mtd_oob_ops *ops)
|
|
{
|
|
volatile char dummy;
|
|
loff_t fofs, base;
|
|
struct DiskOnChip *this = mtd->priv;
|
|
void __iomem * docptr = this->virtadr;
|
|
struct Nand *mychip = &this->chips[ofs >> this->chipshift];
|
|
size_t i, size, got, want;
|
|
int ret = 0;
|
|
uint8_t *buf = ops->oobbuf;
|
|
size_t len = ops->len;
|
|
|
|
BUG_ON(ops->mode != MTD_OOB_PLACE);
|
|
|
|
ofs += ops->ooboffs;
|
|
|
|
DoC_CheckASIC(docptr);
|
|
|
|
/* Find the chip which is to be used and select it */
|
|
if (this->curfloor != mychip->floor) {
|
|
DoC_SelectFloor(docptr, mychip->floor);
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
} else if (this->curchip != mychip->chip) {
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
}
|
|
this->curfloor = mychip->floor;
|
|
this->curchip = mychip->chip;
|
|
|
|
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
|
|
WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
|
|
|
|
|
|
/* Maximum of 16 bytes in the OOB region, so limit write to that */
|
|
if (len > 16)
|
|
len = 16;
|
|
got = 0;
|
|
want = len;
|
|
|
|
for (i = 0; ((i < 3) && (want > 0)); i++) {
|
|
/* Reset the chip, see Software Requirement 11.4 item 1. */
|
|
DoC_Command(docptr, NAND_CMD_RESET, 0);
|
|
DoC_WaitReady(docptr);
|
|
|
|
/* Figure out which region we are accessing... */
|
|
fofs = ofs;
|
|
base = ofs & 0x0f;
|
|
if (!this->interleave) {
|
|
WriteDOC(NAND_CMD_READOOB, docptr, Mplus_FlashCmd);
|
|
size = 16 - base;
|
|
} else if (base < 6) {
|
|
WriteDOC(DoC_GetECCOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
|
|
size = 6 - base;
|
|
} else if (base < 8) {
|
|
WriteDOC(DoC_GetFlagsOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
|
|
size = 8 - base;
|
|
} else {
|
|
WriteDOC(DoC_GetHdrOffset(mtd, &fofs), docptr, Mplus_FlashCmd);
|
|
size = 16 - base;
|
|
}
|
|
if (size > want)
|
|
size = want;
|
|
|
|
/* Issue the Serial Data In command to initial the Page Program process */
|
|
DoC_Command(docptr, NAND_CMD_SEQIN, 0x00);
|
|
DoC_Address(this, 3, fofs, 0, 0x00);
|
|
|
|
/* Disable the ECC engine */
|
|
WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
|
|
|
|
/* Write the data via the internal pipeline through CDSN IO
|
|
register, see Pipelined Write Operations 11.2 */
|
|
MemWriteDOC(docptr, (unsigned char *) &buf[got], size);
|
|
WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
|
|
WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
|
|
|
|
/* Commit the Page Program command and wait for ready
|
|
see Software Requirement 11.4 item 1.*/
|
|
DoC_Command(docptr, NAND_CMD_PAGEPROG, 0x00);
|
|
DoC_WaitReady(docptr);
|
|
|
|
/* Read the status of the flash device through CDSN IO register
|
|
see Software Requirement 11.4 item 5.*/
|
|
DoC_Command(docptr, NAND_CMD_STATUS, 0x00);
|
|
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
DoC_Delay(docptr, 2);
|
|
if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
|
|
printk("MTD: Error 0x%x programming oob at 0x%x\n",
|
|
dummy, (int)ofs);
|
|
/* FIXME: implement Bad Block Replacement */
|
|
ops->retlen = 0;
|
|
ret = -EIO;
|
|
}
|
|
dummy = ReadDOC(docptr, Mplus_LastDataRead);
|
|
|
|
ofs += size;
|
|
got += size;
|
|
want -= size;
|
|
}
|
|
|
|
/* Disable flash internally */
|
|
WriteDOC(0, docptr, Mplus_FlashSelect);
|
|
|
|
ops->retlen = len;
|
|
return ret;
|
|
}
|
|
|
|
int doc_erase(struct mtd_info *mtd, struct erase_info *instr)
|
|
{
|
|
volatile char dummy;
|
|
struct DiskOnChip *this = mtd->priv;
|
|
__u32 ofs = instr->addr;
|
|
__u32 len = instr->len;
|
|
void __iomem * docptr = this->virtadr;
|
|
struct Nand *mychip = &this->chips[ofs >> this->chipshift];
|
|
|
|
DoC_CheckASIC(docptr);
|
|
|
|
if (len != mtd->erasesize)
|
|
printk(KERN_WARNING "MTD: Erase not right size (%x != %x)n",
|
|
len, mtd->erasesize);
|
|
|
|
/* Find the chip which is to be used and select it */
|
|
if (this->curfloor != mychip->floor) {
|
|
DoC_SelectFloor(docptr, mychip->floor);
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
} else if (this->curchip != mychip->chip) {
|
|
DoC_SelectChip(docptr, mychip->chip);
|
|
}
|
|
this->curfloor = mychip->floor;
|
|
this->curchip = mychip->chip;
|
|
|
|
instr->state = MTD_ERASE_PENDING;
|
|
|
|
/* Millennium Plus bus cycle sequence as per figure 2, section 2.4 */
|
|
WriteDOC(DOC_FLASH_CE, docptr, Mplus_FlashSelect);
|
|
|
|
DoC_Command(docptr, NAND_CMD_RESET, 0x00);
|
|
DoC_WaitReady(docptr);
|
|
|
|
DoC_Command(docptr, NAND_CMD_ERASE1, 0);
|
|
DoC_Address(this, 2, ofs, 0, 0x00);
|
|
DoC_Command(docptr, NAND_CMD_ERASE2, 0);
|
|
DoC_WaitReady(docptr);
|
|
instr->state = MTD_ERASING;
|
|
|
|
/* Read the status of the flash device through CDSN IO register
|
|
see Software Requirement 11.4 item 5. */
|
|
DoC_Command(docptr, NAND_CMD_STATUS, 0);
|
|
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
dummy = ReadDOC(docptr, Mplus_ReadPipeInit);
|
|
if ((dummy = ReadDOC(docptr, Mplus_LastDataRead)) & 1) {
|
|
printk("MTD: Error 0x%x erasing at 0x%x\n", dummy, ofs);
|
|
/* FIXME: implement Bad Block Replacement (in nftl.c ??) */
|
|
instr->state = MTD_ERASE_FAILED;
|
|
} else {
|
|
instr->state = MTD_ERASE_DONE;
|
|
}
|
|
dummy = ReadDOC(docptr, Mplus_LastDataRead);
|
|
|
|
/* Disable flash internally */
|
|
WriteDOC(0, docptr, Mplus_FlashSelect);
|
|
|
|
mtd_erase_callback(instr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
* Module stuff
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void __exit cleanup_doc2001plus(void)
|
|
{
|
|
struct mtd_info *mtd;
|
|
struct DiskOnChip *this;
|
|
|
|
while ((mtd=docmilpluslist)) {
|
|
this = mtd->priv;
|
|
docmilpluslist = this->nextdoc;
|
|
|
|
del_mtd_device(mtd);
|
|
|
|
iounmap(this->virtadr);
|
|
kfree(this->chips);
|
|
kfree(mtd);
|
|
}
|
|
}
|
|
|
|
module_exit(cleanup_doc2001plus);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com> et al.");
|
|
MODULE_DESCRIPTION("Driver for DiskOnChip Millennium Plus");
|