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:
[PATCH] PPC: add accessor macros to clear and set bits in one shot [PATCH] 83xx/85xx/86xx: add more MxMR local bus definitions
In principle, the NAND driver of the TQM8272 should work with it as well.
Signed-off-by: Wolfgang Grandegger wg@grandegger.com Acked-by: Anton Vorontsov avorontsov@ru.mvista.com --- drivers/mtd/nand/fsl_upm.c | 128 +++++++++++++++----------------------------- include/linux/mtd/fsl_upm.h | 1 2 files changed, 46 insertions(+), 83 deletions(-)
Index: u-boot/drivers/mtd/nand/fsl_upm.c =================================================================== --- u-boot.orig/drivers/mtd/nand/fsl_upm.c +++ u-boot/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) + clrbits32(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_in 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_inf
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; } Index: u-boot/include/linux/mtd/fsl_upm.h =================================================================== --- u-boot.orig/include/linux/mtd/fsl_upm.h +++ u-boot/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;