nand: remove dead code and suspend/resume

Get rid of the several "#if 0" sections that were keeping around Linux
code that isn't relevant to U-Boot.  Besides cluttering the code, these
sections make tracking upstream changes harder, rather than easier.
It's easy to discard obviously irrelevant diff hunks that patch rejects,
but it's not as easy to notice hunks that apply cleanly to the #if 0
section, but *are* relevant to U-Boot and require modification elsewhere.

Also remove suspend/resume, as this is not applicable to U-Boot.  Removal
saves 232 bytes on powerpc.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Tested-by: Ben Gardiner <bengardiner@nanometrics.ca>

drivers/mtd/mtdpart.c

@@ -230,18 +230,6 @@ static void part_sync(struct mtd_info *mtd)
 	part->master->sync(part->master);
 }
 
-static int part_suspend(struct mtd_info *mtd)
-{
-	struct mtd_part *part = PART(mtd);
-	return part->master->suspend(part->master);
-}
-
-static void part_resume(struct mtd_info *mtd)
-{
-	struct mtd_part *part = PART(mtd);
-	part->master->resume(part->master);
-}
-
 static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
 {
 	struct mtd_part *part = PART(mtd);
@@ -339,10 +327,6 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
 		slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
 	if (master->sync)
 		slave->mtd.sync = part_sync;
-	if (!partno && master->suspend && master->resume) {
-			slave->mtd.suspend = part_suspend;
-			slave->mtd.resume = part_resume;
-	}
 	if (master->lock)
 		slave->mtd.lock = part_lock;
 	if (master->unlock)

drivers/mtd/nand/nand_base.c

@@ -32,30 +32,6 @@
  *
  */
 
-/* XXX U-BOOT XXX */
-#if 0
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/err.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/nand.h>
-#include <linux/mtd/nand_ecc.h>
-#include <linux/mtd/compatmac.h>
-#include <linux/interrupt.h>
-#include <linux/bitops.h>
-#include <linux/leds.h>
-#include <asm/io.h>
-
-#ifdef CONFIG_MTD_PARTITIONS
-#include <linux/mtd/partitions.h>
-#endif
-
-#endif
-
 #include <common.h>
 
 #define ENOTSUPP	524	/* Operation is not supported */
@@ -75,10 +51,6 @@
 #include <asm/io.h>
 #include <asm/errno.h>
 
-#ifdef CONFIG_JFFS2_NAND
-#include <jffs2/jffs2.h>
-#endif
-
 /*
  * CONFIG_SYS_NAND_RESET_CNT is used as a timeout mechanism when resetting
  * a flash.  NAND flash is initialized prior to interrupts so standard timers
@@ -143,44 +115,17 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
 
 static int nand_wait(struct mtd_info *mtd, struct nand_chip *this);
 
-/*
- * For devices which display every fart in the system on a separate LED. Is
- * compiled away when LED support is disabled.
- */
-/* XXX U-BOOT XXX */
-#if 0
-DEFINE_LED_TRIGGER(nand_led_trigger);
-#endif
-
 /**
  * nand_release_device - [GENERIC] release chip
  * @mtd:	MTD device structure
  *
  * Deselect, release chip lock and wake up anyone waiting on the device
  */
-/* XXX U-BOOT XXX */
-#if 0
-static void nand_release_device(struct mtd_info *mtd)
-{
-	struct nand_chip *chip = mtd->priv;
-
-	/* De-select the NAND device */
-	chip->select_chip(mtd, -1);
-
-	/* Release the controller and the chip */
-	spin_lock(&chip->controller->lock);
-	chip->controller->active = NULL;
-	chip->state = FL_READY;
-	wake_up(&chip->controller->wq);
-	spin_unlock(&chip->controller->lock);
-}
-#else
 static void nand_release_device (struct mtd_info *mtd)
 {
 	struct nand_chip *this = mtd->priv;
 	this->select_chip(mtd, -1);	/* De-select the NAND device */
 }
-#endif
 
 /**
  * nand_read_byte - [DEFAULT] read one byte from the chip
@@ -490,24 +435,6 @@ static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip,
  * Wait for the ready pin, after a command
  * The timeout is catched later.
  */
-/* XXX U-BOOT XXX */
-#if 0
-void nand_wait_ready(struct mtd_info *mtd)
-{
-	struct nand_chip *chip = mtd->priv;
-	unsigned long timeo = jiffies + 2;
-
-	led_trigger_event(nand_led_trigger, LED_FULL);
-	/* wait until command is processed or timeout occures */
-	do {
-		if (chip->dev_ready(mtd))
-			break;
-		touch_softlockup_watchdog();
-	} while (time_before(jiffies, timeo));
-	led_trigger_event(nand_led_trigger, LED_OFF);
-}
-EXPORT_SYMBOL_GPL(nand_wait_ready);
-#else
 void nand_wait_ready(struct mtd_info *mtd)
 {
 	struct nand_chip *chip = mtd->priv;
@@ -522,7 +449,6 @@ void nand_wait_ready(struct mtd_info *mtd)
 				break;
 	}
 }
-#endif
 
 /**
  * nand_command - [DEFAULT] Send command to NAND device
@@ -759,45 +685,11 @@ static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
  *
  * Get the device and lock it for exclusive access
  */
-/* XXX U-BOOT XXX */
-#if 0
-static int
-nand_get_device(struct nand_chip *chip, struct mtd_info *mtd, int new_state)
-{
-	spinlock_t *lock = &chip->controller->lock;
-	wait_queue_head_t *wq = &chip->controller->wq;
-	DECLARE_WAITQUEUE(wait, current);
- retry:
-	spin_lock(lock);
-
-	/* Hardware controller shared among independend devices */
-	/* Hardware controller shared among independend devices */
-	if (!chip->controller->active)
-		chip->controller->active = chip;
-
-	if (chip->controller->active == chip && chip->state == FL_READY) {
-		chip->state = new_state;
-		spin_unlock(lock);
-		return 0;
-	}
-	if (new_state == FL_PM_SUSPENDED) {
-		spin_unlock(lock);
-		return (chip->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
-	}
-	set_current_state(TASK_UNINTERRUPTIBLE);
-	add_wait_queue(wq, &wait);
-	spin_unlock(lock);
-	schedule();
-	remove_wait_queue(wq, &wait);
-	goto retry;
-}
-#else
 static int nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state)
 {
 	this->state = new_state;
 	return 0;
 }
-#endif
 
 /**
  * nand_wait - [DEFAULT]  wait until the command is done
@@ -808,46 +700,6 @@ static int nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int ne
  * Erase can take up to 400ms and program up to 20ms according to
  * general NAND and SmartMedia specs
  */
-/* XXX U-BOOT XXX */
-#if 0
-static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
-{
-
-	unsigned long timeo = jiffies;
-	int status, state = chip->state;
-
-	if (state == FL_ERASING)
-		timeo += (HZ * 400) / 1000;
-	else
-		timeo += (HZ * 20) / 1000;
-
-	led_trigger_event(nand_led_trigger, LED_FULL);
-
-	/* Apply this short delay always to ensure that we do wait tWB in
-	 * any case on any machine. */
-	ndelay(100);
-
-	if ((state == FL_ERASING) && (chip->options & NAND_IS_AND))
-		chip->cmdfunc(mtd, NAND_CMD_STATUS_MULTI, -1, -1);
-	else
-		chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
-
-	while (time_before(jiffies, timeo)) {
-		if (chip->dev_ready) {
-			if (chip->dev_ready(mtd))
-				break;
-		} else {
-			if (chip->read_byte(mtd) & NAND_STATUS_READY)
-				break;
-		}
-		cond_resched();
-	}
-	led_trigger_event(nand_led_trigger, LED_OFF);
-
-	status = (int)chip->read_byte(mtd);
-	return status;
-}
-#else
 static int nand_wait(struct mtd_info *mtd, struct nand_chip *this)
 {
 	unsigned long	timeo;
@@ -886,7 +738,6 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *this)
 
 	return this->read_byte(mtd);
 }
-#endif
 
 /**
  * nand_read_page_raw - [Intern] read raw page data without ecc
@@ -2516,32 +2367,6 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
 	return chip->block_markbad(mtd, ofs);
 }
 
-/**
- * nand_suspend - [MTD Interface] Suspend the NAND flash
- * @mtd:	MTD device structure
- */
-static int nand_suspend(struct mtd_info *mtd)
-{
-	struct nand_chip *chip = mtd->priv;
-
-	return nand_get_device(chip, mtd, FL_PM_SUSPENDED);
-}
-
-/**
- * nand_resume - [MTD Interface] Resume the NAND flash
- * @mtd:	MTD device structure
- */
-static void nand_resume(struct mtd_info *mtd)
-{
-	struct nand_chip *chip = mtd->priv;
-
-	if (chip->state == FL_PM_SUSPENDED)
-		nand_release_device(mtd);
-	else
-		printk(KERN_ERR "nand_resume() called for a chip which is not "
-		       "in suspended state\n");
-}
-
 /*
  * Set default functions
  */
@@ -2577,17 +2402,8 @@ static void nand_set_defaults(struct nand_chip *chip, int busw)
 		chip->verify_buf = busw ? nand_verify_buf16 : nand_verify_buf;
 	if (!chip->scan_bbt)
 		chip->scan_bbt = nand_default_bbt;
-
-	if (!chip->controller) {
+	if (!chip->controller)
 		chip->controller = &chip->hwcontrol;
-
-		/* XXX U-BOOT XXX */
-#if 0
-		spin_lock_init(&chip->controller->lock);
-		init_waitqueue_head(&chip->controller->wq);
-#endif
-	}
-
 }
 
 /*
@@ -3021,8 +2837,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 	mtd->sync = nand_sync;
 	mtd->lock = NULL;
 	mtd->unlock = NULL;
-	mtd->suspend = nand_suspend;
-	mtd->resume = nand_resume;
 	mtd->block_isbad = nand_block_isbad;
 	mtd->block_markbad = nand_block_markbad;
 
@@ -3036,16 +2850,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 	return 0;
 }
 
-/* module_text_address() isn't exported, and it's mostly a pointless
-   test if this is a module _anyway_ -- they'd have to try _really_ hard
-   to call us from in-kernel code if the core NAND support is modular. */
-#ifdef MODULE
-#define caller_is_module() (1)
-#else
-#define caller_is_module() \
-	module_text_address((unsigned long)__builtin_return_address(0))
-#endif
-
 /**
  * nand_scan - [NAND Interface] Scan for the NAND device
  * @mtd:	MTD device structure
@@ -3062,15 +2866,6 @@ int nand_scan(struct mtd_info *mtd, int maxchips)
 {
 	int ret;
 
-	/* Many callers got this wrong, so check for it for a while... */
-	/* XXX U-BOOT XXX */
-#if 0
-	if (!mtd->owner && caller_is_module()) {
-		printk(KERN_CRIT "nand_scan() called with NULL mtd->owner!\n");
-		BUG();
-	}
-#endif
-
 	ret = nand_scan_ident(mtd, maxchips);
 	if (!ret)
 		ret = nand_scan_tail(mtd);
@@ -3089,40 +2884,9 @@ void nand_release(struct mtd_info *mtd)
 	/* Deregister partitions */
 	del_mtd_partitions(mtd);
 #endif
-	/* Deregister the device */
-	/* XXX U-BOOT XXX */
-#if 0
-	del_mtd_device(mtd);
-#endif
 
 	/* Free bad block table memory */
 	kfree(chip->bbt);
 	if (!(chip->options & NAND_OWN_BUFFERS))
 		kfree(chip->buffers);
 }
-
-/* XXX U-BOOT XXX */
-#if 0
-EXPORT_SYMBOL_GPL(nand_scan);
-EXPORT_SYMBOL_GPL(nand_scan_ident);
-EXPORT_SYMBOL_GPL(nand_scan_tail);
-EXPORT_SYMBOL_GPL(nand_release);
-
-static int __init nand_base_init(void)
-{
-	led_trigger_register_simple("nand-disk", &nand_led_trigger);
-	return 0;
-}
-
-static void __exit nand_base_exit(void)
-{
-	led_trigger_unregister_simple(nand_led_trigger);
-}
-
-module_init(nand_base_init);
-module_exit(nand_base_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Steven J. Hill <sjhill@realitydiluted.com>, Thomas Gleixner <tglx@linutronix.de>");
-MODULE_DESCRIPTION("Generic NAND flash driver code");
-#endif

drivers/mtd/nand/nand_bbt.c

@@ -58,19 +58,6 @@
 
 #include <asm/errno.h>
 
-/* XXX U-BOOT XXX */
-#if 0
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/nand.h>
-#include <linux/mtd/nand_ecc.h>
-#include <linux/mtd/compatmac.h>
-#include <linux/bitops.h>
-#include <linux/delay.h>
-#include <linux/vmalloc.h>
-#endif
-
 /**
  * check_pattern - [GENERIC] check if a pattern is in the buffer
  * @buf:	the buffer to search
@@ -1231,9 +1218,3 @@ int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt)
 	}
 	return 1;
 }
-
-/* XXX U-BOOT XXX */
-#if 0
-EXPORT_SYMBOL(nand_scan_bbt);
-EXPORT_SYMBOL(nand_default_bbt);
-#endif

drivers/mtd/nand/nand_ecc.c

@@ -37,14 +37,6 @@
 
 #include <common.h>
 
-/* XXX U-BOOT XXX */
-#if 0
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/mtd/nand_ecc.h>
-#endif
-
 #include <asm/errno.h>
 #include <linux/mtd/mtd.h>
 
@@ -140,10 +132,6 @@ int nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
 
 	return 0;
 }
-/* XXX U-BOOT XXX */
-#if 0
-EXPORT_SYMBOL(nand_calculate_ecc);
-#endif
 #endif /* CONFIG_NAND_SPL */
 
 static inline int countbits(uint32_t byte)
@@ -212,8 +200,3 @@ int nand_correct_data(struct mtd_info *mtd, u_char *dat,
 
 	return -EBADMSG;
 }
-
-/* XXX U-BOOT XXX */
-#if 0
-EXPORT_SYMBOL(nand_correct_data);
-#endif

drivers/mtd/nand/nand_util.c

@@ -211,41 +211,6 @@ int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
 	return 0;
 }
 
-/* XXX U-BOOT XXX */
-#if 0
-
-#define MAX_PAGE_SIZE	2048
-#define MAX_OOB_SIZE	64
-
-/*
- * buffer array used for writing data
- */
-static unsigned char data_buf[MAX_PAGE_SIZE];
-static unsigned char oob_buf[MAX_OOB_SIZE];
-
-/* OOB layouts to pass into the kernel as default */
-static struct nand_ecclayout none_ecclayout = {
-	.useecc = MTD_NANDECC_OFF,
-};
-
-static struct nand_ecclayout jffs2_ecclayout = {
-	.useecc = MTD_NANDECC_PLACE,
-	.eccbytes = 6,
-	.eccpos = { 0, 1, 2, 3, 6, 7 }
-};
-
-static struct nand_ecclayout yaffs_ecclayout = {
-	.useecc = MTD_NANDECC_PLACE,
-	.eccbytes = 6,
-	.eccpos = { 8, 9, 10, 13, 14, 15}
-};
-
-static struct nand_ecclayout autoplace_ecclayout = {
-	.useecc = MTD_NANDECC_AUTOPLACE
-};
-#endif
-
-/* XXX U-BOOT XXX */
 #ifdef CONFIG_CMD_NAND_LOCK_UNLOCK
 
 /******************************************************************************

include/linux/mtd/mtd.h

@@ -208,10 +208,6 @@ struct mtd_info {
 	int (*lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 	int (*unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 
-	/* Power Management functions */
-	int (*suspend) (struct mtd_info *mtd);
-	void (*resume) (struct mtd_info *mtd);
-
 	/* Bad block management functions */
 	int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
 	int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);