diff mbox

[RFC,38/47] mtd: nand: stm_nand_bch: check WP (FLEX)

Message ID 1395735604-26706-39-git-send-email-lee.jones@linaro.org
State New
Headers show

Commit Message

Lee Jones March 25, 2014, 8:19 a.m. UTC 
Return status of the Write Protect bit for the NAND device.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/mtd/nand/stm_nand_bch.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
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Patch

diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
index 3853e7a..18601e5 100644
--- a/drivers/mtd/nand/stm_nand_bch.c
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -543,6 +543,22 @@  static void flex_addr(struct nandi_controller *nandi,
 	writel(addr, nandi->base + NANDHAM_FLEX_ADD);
 }
 
+/*
+ * Hamming-FLEX operations (optimised replacements for nand_base.c versions)
+ */
+static int flex_check_wp(struct nandi_controller *nandi)
+{
+	uint8_t status;
+
+	emiss_nandi_select(STM_NANDI_HAMMING);
+
+	flex_cmd(nandi, NAND_CMD_STATUS);
+
+	status = (uint8_t)(readl(nandi->base + NANDHAM_FLEX_DATA) & 0xff);
+
+	return status & NAND_STATUS_WP ? 0 : 1;
+}
+
 static int flex_read_raw(struct nandi_controller *nandi,
 			 uint32_t page_addr,
 			 uint32_t col_addr,