Patchwork [v2,05/14] mtd: nand: pxa3xx: Use 'length override' in ONFI paramater page read

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Submitter Ezequiel Garcia
Date Aug. 7, 2013, 12:31 p.m.
Message ID <1375878679-18098-6-git-send-email-ezequiel.garcia@free-electrons.com>
Download mbox | patch
Permalink /patch/265493/
State New
Headers show

Comments

Ezequiel Garcia - Aug. 7, 2013, 12:31 p.m.
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>
---
 drivers/mtd/nand/pxa3xx_nand.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 65e3ee9..d1e8ddb3 100644
--- 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)
@@ -553,6 +554,9 @@  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;
@@ -628,8 +632,10 @@  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;