NAND FSL UPM: driver re-write using the hwcontrol callback

This is a re-write of the NAND FSL UPM driver using the more universal
hwcontrol callback (instead of the cmdfunc callback). Here is a brief
list of furher modifications:

- For the time being, the UPM setup writing the UPM array has been
  removed from the driver and must now be done by the board specific
  code.

- The bus width definition in "struct fsl_upm_nand" is now in bits to
  comply with the corresponding Linux driver and 8, 16 and 32 bit
  accesses are supported.

- chip->dev_read is only set if fun->dev_ready != NULL, which is
  required for boards not connecting the R/B pin.

- A few issue have been fixed with MxMR bit manipulation like in the
  corresponding Linux driver.

Note: I think the "io_addr" field of "struct fsl_upm" could be removed
      as well, because the address is already determined by
      "nand->IO_ADDR_[RW]", but I'm not 100% sure.

This patch has been tested on a TQM8548 modules with the NAND chip
Micron MT29F8G08FABWP.

This patch is based on the following patches posted to this list a few
minutes ago:

  PPC: add accessor macros to clear and set bits in one shot
  83xx/85xx/86xx: add more MxMR local bus definitions

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Anton Vorontsov <avorontsov@ru.mvista.com>

2 files changed, 46 insertions, 83 deletions

diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c
index 5cc410a..67ae9c8 100644
--- a/drivers/mtd/nand/fsl_upm.c
+++ b/drivers/mtd/nand/fsl_upm.c
@@ -20,112 +20,83 @@
 #include <linux/mtd/fsl_upm.h>
 #include <nand.h>
 
-#define FSL_UPM_MxMR_OP_NO (0 << 28) /* normal operation */
-#define FSL_UPM_MxMR_OP_WA (1 << 28) /* write array */
-#define FSL_UPM_MxMR_OP_RA (2 << 28) /* read array */
-#define FSL_UPM_MxMR_OP_RP (3 << 28) /* run pattern */
+static int fsl_upm_in_pattern;
 
 static void fsl_upm_start_pattern(struct fsl_upm *upm, u32 pat_offset)
 {
-	out_be32(upm->mxmr, FSL_UPM_MxMR_OP_RP | pat_offset);
+	clrsetbits_be32(upm->mxmr, MxMR_MAD_MSK, MxMR_OP_RUNP | pat_offset);
 }
 
 static void fsl_upm_end_pattern(struct fsl_upm *upm)
 {
-	out_be32(upm->mxmr, FSL_UPM_MxMR_OP_NO);
-	while (in_be32(upm->mxmr) != FSL_UPM_MxMR_OP_NO)
+	clrbits_be32(upm->mxmr, MxMR_OP_RUNP);
+
+	while (in_be32(upm->mxmr) & MxMR_OP_RUNP)
 		eieio();
 }
 
 static void fsl_upm_run_pattern(struct fsl_upm *upm, int width, u32 cmd)
 {
-	out_be32(upm->mar, cmd << (32 - width * 8));
-	out_8(upm->io_addr, 0x0);
-}
-
-static void fsl_upm_setup(struct fsl_upm *upm)
-{
-	int i;
-
-	/* write upm array */
-	out_be32(upm->mxmr, FSL_UPM_MxMR_OP_WA);
-
-	for (i = 0; i < 64; i++) {
-		out_be32(upm->mdr, upm->array[i]);
+	out_be32(upm->mar, cmd << (32 - width));
+	switch (width) {
+	case 8:
 		out_8(upm->io_addr, 0x0);
+		break;
+	case 16:
+		out_be16(upm->io_addr, 0x0);
+		break;
+	case 32:
+		out_be32(upm->io_addr, 0x0);
+		break;
 	}
-
-	/* normal operation */
-	out_be32(upm->mxmr, FSL_UPM_MxMR_OP_NO);
-	while (in_be32(upm->mxmr) != FSL_UPM_MxMR_OP_NO)
-		eieio();
 }
 
-static void fun_cmdfunc(struct mtd_info *mtd, unsigned command, int column,
-			int page_addr)
+static void nand_hwcontrol (struct mtd_info *mtd, int cmd)
 {
 	struct nand_chip *chip = mtd->priv;
 	struct fsl_upm_nand *fun = chip->priv;
 
-	fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
-
-	if (command == NAND_CMD_SEQIN) {
-		int readcmd;
-
-		if (column >= mtd->oobblock) {
-			/* OOB area */
-			column -= mtd->oobblock;
-			readcmd = NAND_CMD_READOOB;
-		} else if (column < 256) {
-			/* First 256 bytes --> READ0 */
-			readcmd = NAND_CMD_READ0;
-		} else {
-			column -= 256;
-			readcmd = NAND_CMD_READ1;
-		}
-		fsl_upm_run_pattern(&fun->upm, fun->width, readcmd);
+	switch (cmd) {
+	case NAND_CTL_SETCLE:
+		fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
+		fsl_upm_in_pattern++;
+		break;
+	case NAND_CTL_SETALE:
+		fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
+		fsl_upm_in_pattern++;
+		break;
+	case NAND_CTL_CLRCLE:
+	case NAND_CTL_CLRALE:
+		fsl_upm_end_pattern(&fun->upm);
+		fsl_upm_in_pattern--;
+		break;
 	}
+}
 
-	fsl_upm_run_pattern(&fun->upm, fun->width, command);
-
-	fsl_upm_end_pattern(&fun->upm);
-
-	fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
-
-	if (column != -1)
-		fsl_upm_run_pattern(&fun->upm, fun->width, column);
+static void nand_write_byte(struct mtd_info *mtd, u_char byte)
+{
+	struct nand_chip *chip = mtd->priv;
 
-	if (page_addr != -1) {
-		fsl_upm_run_pattern(&fun->upm, fun->width, page_addr);
-		fsl_upm_run_pattern(&fun->upm, fun->width,
-				    (page_addr >> 8) & 0xFF);
-		if (chip->chipsize > (32 << 20)) {
-			fsl_upm_run_pattern(&fun->upm, fun->width,
-					    (page_addr >> 16) & 0x0f);
-		}
-	}
+	if (fsl_upm_in_pattern) {
+		struct fsl_upm_nand *fun = chip->priv;
 
-	fsl_upm_end_pattern(&fun->upm);
+		fsl_upm_run_pattern(&fun->upm, fun->width, byte);
 
-	if (fun->wait_pattern) {
 		/*
 		 * Some boards/chips needs this. At least on MPC8360E-RDK we
 		 * need it. Probably weird chip, because I don't see any need
 		 * for this on MPC8555E + Samsung K9F1G08U0A. Usually here are
 		 * 0-2 unexpected busy states per block read.
 		 */
-		while (!fun->dev_ready())
-			debug("unexpected busy state\n");
+		if (fun->wait_pattern) {
+			while (!fun->dev_ready())
+				debug("unexpected busy state\n");
+		}
+	} else {
+		out_8(chip->IO_ADDR_W, byte);
 	}
 }
 
-static void nand_write_byte(struct mtd_info *mtd, u_char byte)
-{
-	struct nand_chip *chip = mtd->priv;
-
-	out_8(chip->IO_ADDR_W, byte);
-}
-
 static u8 nand_read_byte(struct mtd_info *mtd)
 {
 	struct nand_chip *chip = mtd->priv;
@@ -164,10 +135,6 @@ static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
 	return 0;
 }
 
-static void nand_hwcontrol(struct mtd_info *mtd, int cmd)
-{
-}
-
 static int nand_dev_ready(struct mtd_info *mtd)
 {
 	struct nand_chip *chip = mtd->priv;
@@ -178,23 +145,20 @@ static int nand_dev_ready(struct mtd_info *mtd)
 
 int fsl_upm_nand_init(struct nand_chip *chip, struct fsl_upm_nand *fun)
 {
-	/* yet only 8 bit accessors implemented */
-	if (fun->width != 1)
+	if (fun->width != 8 && fun->width != 16 && fun->width != 32)
 		return -ENOSYS;
 
-	fsl_upm_setup(&fun->upm);
-
 	chip->priv = fun;
 	chip->chip_delay = fun->chip_delay;
 	chip->eccmode = NAND_ECC_SOFT;
-	chip->cmdfunc = fun_cmdfunc;
 	chip->hwcontrol = nand_hwcontrol;
 	chip->read_byte = nand_read_byte;
 	chip->read_buf = nand_read_buf;
 	chip->write_byte = nand_write_byte;
 	chip->write_buf = nand_write_buf;
 	chip->verify_buf = nand_verify_buf;
-	chip->dev_ready = nand_dev_ready;
+	if (fun->dev_ready)
+		chip->dev_ready = nand_dev_ready;
 
 	return 0;
 }
diff --git a/include/linux/mtd/fsl_upm.h b/include/linux/mtd/fsl_upm.h
index 634ff02..49fd8a6 100644
--- a/include/linux/mtd/fsl_upm.h
+++ b/include/linux/mtd/fsl_upm.h
@@ -16,7 +16,6 @@
 #include <linux/mtd/nand.h>
 
 struct fsl_upm {
-	const u32 *array;
 	void __iomem *mdr;
 	void __iomem *mxmr;
 	void __iomem *mar;