mtd: nand: pxa3xx: Use 'length override' in ONFI paramater page read

The ONFI command 'parameter page read' needs a non-standard length.
Therefore, we enable the 'length override' field in NDCB0 and set
a non-zero 'length count' in NDCB3.

Additionally, the 'spare enable' bit must be disabled for any command
that sets a non-zero 'length count' in NDCB3.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index b3fc146..beef5bc 100644 (file)
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -80,6 +80,7 @@
 #define NDSR_RDDREQ            (0x1 << 1)
 #define NDSR_WRCMDREQ          (0x1)
 
+#define NDCB0_LEN_OVRD         (0x1 << 28)
 #define NDCB0_ST_ROW_EN         (0x1 << 26)
 #define NDCB0_AUTO_RS          (0x1 << 25)
 #define NDCB0_CSEL             (0x1 << 24)
@@ -562,6 +563,9 @@ static int prepare_command_pool(struct pxa3xx_nand_info *info, int command,
        case NAND_CMD_READOOB:
                pxa3xx_set_datasize(info);
                break;
+       case NAND_CMD_PARAM:
+               info->use_spare = 0;
+               break;
        case NAND_CMD_SEQIN:
                exec_cmd = 0;
                break;
@@ -637,8 +641,10 @@ static int prepare_command_pool(struct pxa3xx_nand_info *info, int command,
                info->buf_count = 256;
                info->ndcb0 |= NDCB0_CMD_TYPE(0)
                                | NDCB0_ADDR_CYC(1)
+                               | NDCB0_LEN_OVRD
                                | cmd;
                info->ndcb1 = (column & 0xFF);
+               info->ndcb3 = 256;
                info->data_size = 256;
                break;