1 files changed, 279 insertions, 88 deletions

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 28af71c6183..7b8f1fffc52 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -11,6 +11,7 @@
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/delay.h>
+#include <linux/interrupt.h>
 #include <linux/jiffies.h>
 #include <linux/sched.h>
 #include <linux/mtd/mtd.h>
@@ -24,6 +25,7 @@
 #include <plat/nand.h>
 
 #define	DRIVER_NAME	"omap2-nand"
+#define	OMAP_NAND_TIMEOUT_MS	5000
 
 #define NAND_Ecc_P1e		(1 << 0)
 #define NAND_Ecc_P2e		(1 << 1)
@@ -96,26 +98,19 @@
 static const char *part_probes[] = { "cmdlinepart", NULL };
 #endif
 
-#ifdef CONFIG_MTD_NAND_OMAP_PREFETCH
-static int use_prefetch = 1;
-
-/* "modprobe ... use_prefetch=0" etc */
-module_param(use_prefetch, bool, 0);
-MODULE_PARM_DESC(use_prefetch, "enable/disable use of PREFETCH");
-
-#ifdef CONFIG_MTD_NAND_OMAP_PREFETCH_DMA
-static int use_dma = 1;
+/* oob info generated runtime depending on ecc algorithm and layout selected */
+static struct nand_ecclayout omap_oobinfo;
+/* Define some generic bad / good block scan pattern which are used
+ * while scanning a device for factory marked good / bad blocks
+ */
+static uint8_t scan_ff_pattern[] = { 0xff };
+static struct nand_bbt_descr bb_descrip_flashbased = {
+	.options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES,
+	.offs = 0,
+	.len = 1,
+	.pattern = scan_ff_pattern,
+};
 
-/* "modprobe ... use_dma=0" etc */
-module_param(use_dma, bool, 0);
-MODULE_PARM_DESC(use_dma, "enable/disable use of DMA");
-#else
-static const int use_dma;
-#endif
-#else
-const int use_prefetch;
-static const int use_dma;
-#endif
 
 struct omap_nand_info {
 	struct nand_hw_control		controller;
@@ -129,6 +124,13 @@ struct omap_nand_info {
 	unsigned long			phys_base;
 	struct completion		comp;
 	int				dma_ch;
+	int				gpmc_irq;
+	enum {
+		OMAP_NAND_IO_READ = 0,	/* read */
+		OMAP_NAND_IO_WRITE,	/* write */
+	} iomode;
+	u_char				*buf;
+	int					buf_len;
 };
 
 /**
@@ -256,7 +258,8 @@ static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len)
 	}
 
 	/* configure and start prefetch transfer */
-	ret = gpmc_prefetch_enable(info->gpmc_cs, 0x0, len, 0x0);
+	ret = gpmc_prefetch_enable(info->gpmc_cs,
+			PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x0);
 	if (ret) {
 		/* PFPW engine is busy, use cpu copy method */
 		if (info->nand.options & NAND_BUSWIDTH_16)
@@ -288,9 +291,10 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
 {
 	struct omap_nand_info *info = container_of(mtd,
 						struct omap_nand_info, mtd);
-	uint32_t pref_count = 0, w_count = 0;
+	uint32_t w_count = 0;
 	int i = 0, ret = 0;
 	u16 *p;
+	unsigned long tim, limit;
 
 	/* take care of subpage writes */
 	if (len % 2 != 0) {
@@ -300,7 +304,8 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
 	}
 
 	/*  configure and start prefetch transfer */
-	ret = gpmc_prefetch_enable(info->gpmc_cs, 0x0, len, 0x1);
+	ret = gpmc_prefetch_enable(info->gpmc_cs,
+			PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1);
 	if (ret) {
 		/* PFPW engine is busy, use cpu copy method */
 		if (info->nand.options & NAND_BUSWIDTH_16)
@@ -316,15 +321,17 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
 				iowrite16(*p++, info->nand.IO_ADDR_W);
 		}
 		/* wait for data to flushed-out before reset the prefetch */
-		do {
-			pref_count = gpmc_read_status(GPMC_PREFETCH_COUNT);
-		} while (pref_count);
+		tim = 0;
+		limit = (loops_per_jiffy *
+					msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
+		while (gpmc_read_status(GPMC_PREFETCH_COUNT) && (tim++ < limit))
+			cpu_relax();
+
 		/* disable and stop the PFPW engine */
 		gpmc_prefetch_reset(info->gpmc_cs);
 	}
 }
 
-#ifdef CONFIG_MTD_NAND_OMAP_PREFETCH_DMA
 /*
  * omap_nand_dma_cb: callback on the completion of dma transfer
  * @lch: logical channel
@@ -348,14 +355,15 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
 {
 	struct omap_nand_info *info = container_of(mtd,
 					struct omap_nand_info, mtd);
-	uint32_t prefetch_status = 0;
 	enum dma_data_direction dir = is_write ? DMA_TO_DEVICE :
 							DMA_FROM_DEVICE;
 	dma_addr_t dma_addr;
 	int ret;
+	unsigned long tim, limit;
 
-	/* The fifo depth is 64 bytes. We have a sync at each frame and frame
-	 * length is 64 bytes.
+	/* The fifo depth is 64 bytes max.
+	 * But configure the FIFO-threahold to 32 to get a sync at each frame
+	 * and frame length is 32 bytes.
 	 */
 	int buf_len = len >> 6;
 
@@ -396,9 +404,10 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
 					OMAP24XX_DMA_GPMC, OMAP_DMA_SRC_SYNC);
 	}
 	/*  configure and start prefetch transfer */
-	ret = gpmc_prefetch_enable(info->gpmc_cs, 0x1, len, is_write);
+	ret = gpmc_prefetch_enable(info->gpmc_cs,
+			PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write);
 	if (ret)
-		/* PFPW engine is busy, use cpu copy methode */
+		/* PFPW engine is busy, use cpu copy method */
 		goto out_copy;
 
 	init_completion(&info->comp);
@@ -407,10 +416,11 @@ static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
 
 	/* setup and start DMA using dma_addr */
 	wait_for_completion(&info->comp);
+	tim = 0;
+	limit = (loops_per_jiffy * msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
+	while (gpmc_read_status(GPMC_PREFETCH_COUNT) && (tim++ < limit))
+		cpu_relax();
 
-	do {
-		prefetch_status = gpmc_read_status(GPMC_PREFETCH_COUNT);
-	} while (prefetch_status);
 	/* disable and stop the PFPW engine */
 	gpmc_prefetch_reset(info->gpmc_cs);
 
@@ -426,14 +436,6 @@ out_copy:
 			: omap_write_buf8(mtd, (u_char *) addr, len);
 	return 0;
 }
-#else
-static void omap_nand_dma_cb(int lch, u16 ch_status, void *data) {}
-static inline int omap_nand_dma_transfer(struct mtd_info *mtd, void *addr,
-					unsigned int len, int is_write)
-{
-	return 0;
-}
-#endif
 
 /**
  * omap_read_buf_dma_pref - read data from NAND controller into buffer
@@ -466,6 +468,157 @@ static void omap_write_buf_dma_pref(struct mtd_info *mtd,
 		omap_nand_dma_transfer(mtd, (u_char *) buf, len, 0x1);
 }
 
+/*
+ * omap_nand_irq - GMPC irq handler
+ * @this_irq: gpmc irq number
+ * @dev: omap_nand_info structure pointer is passed here
+ */
+static irqreturn_t omap_nand_irq(int this_irq, void *dev)
+{
+	struct omap_nand_info *info = (struct omap_nand_info *) dev;
+	u32 bytes;
+	u32 irq_stat;
+
+	irq_stat = gpmc_read_status(GPMC_GET_IRQ_STATUS);
+	bytes = gpmc_read_status(GPMC_PREFETCH_FIFO_CNT);
+	bytes = bytes  & 0xFFFC; /* io in multiple of 4 bytes */
+	if (info->iomode == OMAP_NAND_IO_WRITE) { /* checks for write io */
+		if (irq_stat & 0x2)
+			goto done;
+
+		if (info->buf_len && (info->buf_len < bytes))
+			bytes = info->buf_len;
+		else if (!info->buf_len)
+			bytes = 0;
+		iowrite32_rep(info->nand.IO_ADDR_W,
+						(u32 *)info->buf, bytes >> 2);
+		info->buf = info->buf + bytes;
+		info->buf_len -= bytes;
+
+	} else {
+		ioread32_rep(info->nand.IO_ADDR_R,
+						(u32 *)info->buf, bytes >> 2);
+		info->buf = info->buf + bytes;
+
+		if (irq_stat & 0x2)
+			goto done;
+	}
+	gpmc_cs_configure(info->gpmc_cs, GPMC_SET_IRQ_STATUS, irq_stat);
+
+	return IRQ_HANDLED;
+
+done:
+	complete(&info->comp);
+	/* disable irq */
+	gpmc_cs_configure(info->gpmc_cs, GPMC_ENABLE_IRQ, 0);
+
+	/* clear status */
+	gpmc_cs_configure(info->gpmc_cs, GPMC_SET_IRQ_STATUS, irq_stat);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * omap_read_buf_irq_pref - read data from NAND controller into buffer
+ * @mtd: MTD device structure
+ * @buf: buffer to store date
+ * @len: number of bytes to read
+ */
+static void omap_read_buf_irq_pref(struct mtd_info *mtd, u_char *buf, int len)
+{
+	struct omap_nand_info *info = container_of(mtd,
+						struct omap_nand_info, mtd);
+	int ret = 0;
+
+	if (len <= mtd->oobsize) {
+		omap_read_buf_pref(mtd, buf, len);
+		return;
+	}
+
+	info->iomode = OMAP_NAND_IO_READ;
+	info->buf = buf;
+	init_completion(&info->comp);
+
+	/*  configure and start prefetch transfer */
+	ret = gpmc_prefetch_enable(info->gpmc_cs,
+			PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0);
+	if (ret)
+		/* PFPW engine is busy, use cpu copy method */
+		goto out_copy;
+
+	info->buf_len = len;
+	/* enable irq */
+	gpmc_cs_configure(info->gpmc_cs, GPMC_ENABLE_IRQ,
+		(GPMC_IRQ_FIFOEVENTENABLE | GPMC_IRQ_COUNT_EVENT));
+
+	/* waiting for read to complete */
+	wait_for_completion(&info->comp);
+
+	/* disable and stop the PFPW engine */
+	gpmc_prefetch_reset(info->gpmc_cs);
+	return;
+
+out_copy:
+	if (info->nand.options & NAND_BUSWIDTH_16)
+		omap_read_buf16(mtd, buf, len);
+	else
+		omap_read_buf8(mtd, buf, len);
+}
+
+/*
+ * omap_write_buf_irq_pref - write buffer to NAND controller
+ * @mtd: MTD device structure
+ * @buf: data buffer
+ * @len: number of bytes to write
+ */
+static void omap_write_buf_irq_pref(struct mtd_info *mtd,
+					const u_char *buf, int len)
+{
+	struct omap_nand_info *info = container_of(mtd,
+						struct omap_nand_info, mtd);
+	int ret = 0;
+	unsigned long tim, limit;
+
+	if (len <= mtd->oobsize) {
+		omap_write_buf_pref(mtd, buf, len);
+		return;
+	}
+
+	info->iomode = OMAP_NAND_IO_WRITE;
+	info->buf = (u_char *) buf;
+	init_completion(&info->comp);
+
+	/* configure and start prefetch transfer : size=24 */
+	ret = gpmc_prefetch_enable(info->gpmc_cs,
+			(PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1);
+	if (ret)
+		/* PFPW engine is busy, use cpu copy method */
+		goto out_copy;
+
+	info->buf_len = len;
+	/* enable irq */
+	gpmc_cs_configure(info->gpmc_cs, GPMC_ENABLE_IRQ,
+			(GPMC_IRQ_FIFOEVENTENABLE | GPMC_IRQ_COUNT_EVENT));
+
+	/* waiting for write to complete */
+	wait_for_completion(&info->comp);
+	/* wait for data to flushed-out before reset the prefetch */
+	tim = 0;
+	limit = (loops_per_jiffy *  msecs_to_jiffies(OMAP_NAND_TIMEOUT_MS));
+	while (gpmc_read_status(GPMC_PREFETCH_COUNT) && (tim++ < limit))
+		cpu_relax();
+
+	/* disable and stop the PFPW engine */
+	gpmc_prefetch_reset(info->gpmc_cs);
+	return;
+
+out_copy:
+	if (info->nand.options & NAND_BUSWIDTH_16)
+		omap_write_buf16(mtd, buf, len);
+	else
+		omap_write_buf8(mtd, buf, len);
+}
+
 /**
  * omap_verify_buf - Verify chip data against buffer
  * @mtd: MTD device structure
@@ -487,8 +640,6 @@ static int omap_verify_buf(struct mtd_info *mtd, const u_char * buf, int len)
 	return 0;
 }
 
-#ifdef CONFIG_MTD_NAND_OMAP_HWECC
-
 /**
  * gen_true_ecc - This function will generate true ECC value
  * @ecc_buf: buffer to store ecc code
@@ -708,8 +859,6 @@ static void omap_enable_hwecc(struct mtd_info *mtd, int mode)
 	gpmc_enable_hwecc(info->gpmc_cs, mode, dev_width, info->nand.ecc.size);
 }
 
-#endif
-
 /**
  * omap_wait - wait until the command is done
  * @mtd: MTD device structure
@@ -779,6 +928,7 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
 	struct omap_nand_info		*info;
 	struct omap_nand_platform_data	*pdata;
 	int				err;
+	int				i, offset;
 
 	pdata = pdev->dev.platform_data;
 	if (pdata == NULL) {
@@ -804,7 +954,7 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
 	info->mtd.name		= dev_name(&pdev->dev);
 	info->mtd.owner		= THIS_MODULE;
 
-	info->nand.options	|= pdata->devsize ? NAND_BUSWIDTH_16 : 0;
+	info->nand.options	= pdata->devsize;
 	info->nand.options	|= NAND_SKIP_BBTSCAN;
 
 	/* NAND write protect off */
@@ -842,28 +992,13 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
 		info->nand.chip_delay = 50;
 	}
 
-	if (use_prefetch) {
-
+	switch (pdata->xfer_type) {
+	case NAND_OMAP_PREFETCH_POLLED:
 		info->nand.read_buf   = omap_read_buf_pref;
 		info->nand.write_buf  = omap_write_buf_pref;
-		if (use_dma) {
-			err = omap_request_dma(OMAP24XX_DMA_GPMC, "NAND",
-				omap_nand_dma_cb, &info->comp, &info->dma_ch);
-			if (err < 0) {
-				info->dma_ch = -1;
-				printk(KERN_WARNING "DMA request failed."
-					" Non-dma data transfer mode\n");
-			} else {
-				omap_set_dma_dest_burst_mode(info->dma_ch,
-						OMAP_DMA_DATA_BURST_16);
-				omap_set_dma_src_burst_mode(info->dma_ch,
-						OMAP_DMA_DATA_BURST_16);
-
-				info->nand.read_buf   = omap_read_buf_dma_pref;
-				info->nand.write_buf  = omap_write_buf_dma_pref;
-			}
-		}
-	} else {
+		break;
+
+	case NAND_OMAP_POLLED:
 		if (info->nand.options & NAND_BUSWIDTH_16) {
 			info->nand.read_buf   = omap_read_buf16;
 			info->nand.write_buf  = omap_write_buf16;
@@ -871,20 +1006,61 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
 			info->nand.read_buf   = omap_read_buf8;
 			info->nand.write_buf  = omap_write_buf8;
 		}
+		break;
+
+	case NAND_OMAP_PREFETCH_DMA:
+		err = omap_request_dma(OMAP24XX_DMA_GPMC, "NAND",
+				omap_nand_dma_cb, &info->comp, &info->dma_ch);
+		if (err < 0) {
+			info->dma_ch = -1;
+			dev_err(&pdev->dev, "DMA request failed!\n");
+			goto out_release_mem_region;
+		} else {
+			omap_set_dma_dest_burst_mode(info->dma_ch,
+					OMAP_DMA_DATA_BURST_16);
+			omap_set_dma_src_burst_mode(info->dma_ch,
+					OMAP_DMA_DATA_BURST_16);
+
+			info->nand.read_buf   = omap_read_buf_dma_pref;
+			info->nand.write_buf  = omap_write_buf_dma_pref;
+		}
+		break;
+
+	case NAND_OMAP_PREFETCH_IRQ:
+		err = request_irq(pdata->gpmc_irq,
+				omap_nand_irq, IRQF_SHARED, "gpmc-nand", info);
+		if (err) {
+			dev_err(&pdev->dev, "requesting irq(%d) error:%d",
+							pdata->gpmc_irq, err);
+			goto out_release_mem_region;
+		} else {
+			info->gpmc_irq	     = pdata->gpmc_irq;
+			info->nand.read_buf  = omap_read_buf_irq_pref;
+			info->nand.write_buf = omap_write_buf_irq_pref;
+		}
+		break;
+
+	default:
+		dev_err(&pdev->dev,
+			"xfer_type(%d) not supported!\n", pdata->xfer_type);
+		err = -EINVAL;
+		goto out_release_mem_region;
 	}
-	info->nand.verify_buf = omap_verify_buf;
 
-#ifdef CONFIG_MTD_NAND_OMAP_HWECC
-	info->nand.ecc.bytes		= 3;
-	info->nand.ecc.size		= 512;
-	info->nand.ecc.calculate	= omap_calculate_ecc;
-	info->nand.ecc.hwctl		= omap_enable_hwecc;
-	info->nand.ecc.correct		= omap_correct_data;
-	info->nand.ecc.mode		= NAND_ECC_HW;
+	info->nand.verify_buf = omap_verify_buf;
 
-#else
-	info->nand.ecc.mode = NAND_ECC_SOFT;
-#endif
+	/* selsect the ecc type */
+	if (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_DEFAULT)
+		info->nand.ecc.mode = NAND_ECC_SOFT;
+	else if ((pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW) ||
+		(pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW_ROMCODE)) {
+		info->nand.ecc.bytes            = 3;
+		info->nand.ecc.size             = 512;
+		info->nand.ecc.calculate        = omap_calculate_ecc;
+		info->nand.ecc.hwctl            = omap_enable_hwecc;
+		info->nand.ecc.correct          = omap_correct_data;
+		info->nand.ecc.mode             = NAND_ECC_HW;
+	}
 
 	/* DIP switches on some boards change between 8 and 16 bit
 	 * bus widths for flash.  Try the other width if the first try fails.
@@ -897,6 +1073,26 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
 		}
 	}
 
+	/* rom code layout */
+	if (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW_ROMCODE) {
+
+		if (info->nand.options & NAND_BUSWIDTH_16)
+			offset = 2;
+		else {
+			offset = 1;
+			info->nand.badblock_pattern = &bb_descrip_flashbased;
+		}
+		omap_oobinfo.eccbytes = 3 * (info->mtd.oobsize/16);
+		for (i = 0; i < omap_oobinfo.eccbytes; i++)
+			omap_oobinfo.eccpos[i] = i+offset;
+
+		omap_oobinfo.oobfree->offset = offset + omap_oobinfo.eccbytes;
+		omap_oobinfo.oobfree->length = info->mtd.oobsize -
+					(offset + omap_oobinfo.eccbytes);
+
+		info->nand.ecc.layout = &omap_oobinfo;
+	}
+
 #ifdef CONFIG_MTD_PARTITIONS
 	err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
 	if (err > 0)
@@ -926,9 +1122,12 @@ static int omap_nand_remove(struct platform_device *pdev)
 							mtd);
 
 	platform_set_drvdata(pdev, NULL);
-	if (use_dma)
+	if (info->dma_ch != -1)
 		omap_free_dma(info->dma_ch);
 
+	if (info->gpmc_irq)
+		free_irq(info->gpmc_irq, info);
+
 	/* Release NAND device, its internal structures and partitions */
 	nand_release(&info->mtd);
 	iounmap(info->nand.IO_ADDR_R);
@@ -947,16 +1146,8 @@ static struct platform_driver omap_nand_driver = {
 
 static int __init omap_nand_init(void)
 {
-	printk(KERN_INFO "%s driver initializing\n", DRIVER_NAME);
+	pr_info("%s driver initializing\n", DRIVER_NAME);
 
-	/* This check is required if driver is being
-	 * loaded run time as a module
-	 */
-	if ((1 == use_dma) && (0 == use_prefetch)) {
-		printk(KERN_INFO"Wrong parameters: 'use_dma' can not be 1 "
-				"without use_prefetch'. Prefetch will not be"
-				" used in either mode (mpu or dma)\n");
-	}
 	return platform_driver_register(&omap_nand_driver);
 }