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[MTD] Refactor NAND hwcontrol to cmd_ctrl

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The hwcontrol function enforced a step by step state machine
for any kind of hardware chip access. Let the hardware driver
know which control bits are set and inform it about a change
of the control lines. Let the hardware driver write out the
command and address bytes directly. This gives a peformance
advantage for address bus controlled chips and simplifies the
quirks in the hardware drivers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner
2006-05-23 23:25:53 +02:00
parent 3821720d51
commit 7abd3ef987
18 changed files with 419 additions and 532 deletions
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33
include/linux/mtd/nand.h
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@ -50,23 +50,20 @@ extern int nand_write_raw(struct mtd_info *mtd, loff_t to, size_t len,
/*
* Constants for hardware specific CLE/ALE/NCE function
*/
*
* These are bits which can be or'ed to set/clear multiple
* bits in one go.
*/
/* Select the chip by setting nCE to low */
#define NAND_CTL_SETNCE 1
/* Deselect the chip by setting nCE to high */
#define NAND_CTL_CLRNCE 2
#define NAND_NCE 0x01
/* Select the command latch by setting CLE to high */
#define NAND_CTL_SETCLE 3
/* Deselect the command latch by setting CLE to low */
#define NAND_CTL_CLRCLE 4
#define NAND_CLE 0x02
/* Select the address latch by setting ALE to high */
#define NAND_CTL_SETALE 5
/* Deselect the address latch by setting ALE to low */
#define NAND_CTL_CLRALE 6
/* Set write protection by setting WP to high. Not used! */
#define NAND_CTL_SETWP 7
/* Clear write protection by setting WP to low. Not used! */
#define NAND_CTL_CLRWP 8
#define NAND_ALE 0x04
#define NAND_CTRL_CLE (NAND_NCE | NAND_CLE)
#define NAND_CTRL_ALE (NAND_NCE | NAND_ALE)
#define NAND_CTRL_CHANGE 0x80
/*
* Standard NAND flash commands
@ -106,6 +103,8 @@ extern int nand_write_raw(struct mtd_info *mtd, loff_t to, size_t len,
#define NAND_CMD_STATUS_RESET 0x7f
#define NAND_CMD_STATUS_CLEAR 0xff
#define NAND_CMD_NONE -1
/* Status bits */
#define NAND_STATUS_FAIL 0x01
#define NAND_STATUS_FAIL_N1 0x02
@ -263,7 +262,8 @@ struct nand_ecc_ctrl {
* @select_chip: [REPLACEABLE] select chip nr
* @block_bad: [REPLACEABLE] check, if the block is bad
* @block_markbad: [REPLACEABLE] mark the block bad
* @hwcontrol: [BOARDSPECIFIC] hardwarespecific function for accesing control-lines
* @cmd_ctrl: [BOARDSPECIFIC] hardwarespecific funtion for controlling
* ALE/CLE/nCE. Also used to write command and address
* @dev_ready: [BOARDSPECIFIC] hardwarespecific function for accesing device ready/busy line
* If set to NULL no access to ready/busy is available and the ready/busy information
* is read from the chip status register
@ -317,7 +317,8 @@ struct nand_chip {
void (*select_chip)(struct mtd_info *mtd, int chip);
int (*block_bad)(struct mtd_info *mtd, loff_t ofs, int getchip);
int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
void (*hwcontrol)(struct mtd_info *mtd, int cmd);
void (*cmd_ctrl)(struct mtd_info *mtd, int dat,
unsigned int ctrl);
int (*dev_ready)(struct mtd_info *mtd);
void (*cmdfunc)(struct mtd_info *mtd, unsigned command, int column, int page_addr);
int (*waitfunc)(struct mtd_info *mtd, struct nand_chip *this, int state);