[PATCH v7 11/14] mtd: spi-nor-core: Read status by Read Any Register

[tkuw584924 at gmail.com]

From: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>

The spansion_sr_ready() reads status register 1 by Read Any Register
commnad. This function is called from Flash specific hook with die address
and dummy cycles to support multi-die package parts from Spansion/Cypress.

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>
Reviewed-by: Pratyush Yadav <p.yadav at ti.com>
---
Changes in v7:
  - No change
  
Changes in v6:
  - No change

Changes in v5:
  - New in v5, separated from another patch

 drivers/mtd/spi/spi-nor-core.c | 29 +++++++++++++++++++++++++++++
 include/linux/mtd/spi-nor.h    |  1 +
 2 files changed, 30 insertions(+)

diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 55e17aace3..296310eb25 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -523,6 +523,35 @@ static int set_4byte(struct spi_nor *nor, const struct flash_info *info,
 	}
 }
 
+#ifdef CONFIG_SPI_FLASH_SPANSION
+/*
+ * Read status register 1 by using Read Any Register command to support multi
+ * die package parts.
+ */
+static int spansion_sr_ready(struct spi_nor *nor, u32 addr_base, u8 dummy)
+{
+	u32 reg_addr = addr_base + SPINOR_REG_ADDR_STR1V;
+	u8 sr;
+	int ret;
+
+	ret = spansion_read_any_reg(nor, reg_addr, dummy, &sr);
+	if (ret < 0)
+		return ret;
+
+	if (sr & (SR_E_ERR | SR_P_ERR)) {
+		if (sr & SR_E_ERR)
+			dev_dbg(nor->dev, "Erase Error occurred\n");
+		else
+			dev_dbg(nor->dev, "Programming Error occurred\n");
+
+		nor->write_reg(nor, SPINOR_OP_CLSR, NULL, 0);
+		return -EIO;
+	}
+
+	return !(sr & SR_WIP);
+}
+#endif
+
 static int spi_nor_sr_ready(struct spi_nor *nor)
 {
 	int sr = read_sr(nor);
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 2236e36e28..8a187eaf26 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -123,6 +123,7 @@
 #define SPINOR_OP_CLSR		0x30	/* Clear status register 1 */
 #define SPINOR_OP_RDAR		0x65	/* Read any register */
 #define SPINOR_OP_WRAR		0x71	/* Write any register */
+#define SPINOR_REG_ADDR_STR1V	0x00800000
 #define SPINOR_REG_ADDR_CFR1V	0x00800002
 
 /* Used for Micron flashes only. */
-- 
2.25.1