[U-Boot] [PATCH v2] spi: ich: Configure SPI BIOS parameters

[Stefan Roese <sr@denx.de>]

Without configuring these registers in the SPI controller, the Linux
MTD device driver is not able to correctly read/write to the SPI
NOR chip at all. In fact, the chip is not detected at all.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Jagan Teki <jteki@openedev.com>
---
v2:
- Moved code into the ICH SPI driver as suggested by Simon and Bin

 drivers/spi/ich.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/drivers/spi/ich.c b/drivers/spi/ich.c
index caf0103dc3..586b4e9024 100644
--- a/drivers/spi/ich.c
+++ b/drivers/spi/ich.c
@@ -18,6 +18,39 @@
 
 #include "ich.h"
 
+#define SPI_OPMENU_0 0x01 /* WRSR: Write Status Register */
+#define SPI_OPTYPE_0 0x01 /* Write, no address */
+
+#define SPI_OPMENU_1 0x02 /* BYPR: Byte Program */
+#define SPI_OPTYPE_1 0x03 /* Write, address required */
+
+#define SPI_OPMENU_2 0x03 /* READ: Read Data */
+#define SPI_OPTYPE_2 0x02 /* Read, address required */
+
+#define SPI_OPMENU_3 0x05 /* RDSR: Read Status Register */
+#define SPI_OPTYPE_3 0x00 /* Read, no address */
+
+#define SPI_OPMENU_4 0x20 /* SE20: Sector Erase 0x20 */
+#define SPI_OPTYPE_4 0x03 /* Write, address required */
+
+#define SPI_OPMENU_5 0x9f /* RDID: Read ID */
+#define SPI_OPTYPE_5 0x00 /* Read, no address */
+
+#define SPI_OPMENU_6 0xd8 /* BED8: Block Erase 0xd8 */
+#define SPI_OPTYPE_6 0x03 /* Write, address required */
+
+#define SPI_OPMENU_7 0x0b /* FAST: Fast Read */
+#define SPI_OPTYPE_7 0x02 /* Read, address required */
+
+#define SPI_OPTYPE ((SPI_OPTYPE_7 << 14) | (SPI_OPTYPE_6 << 12) | \
+		    (SPI_OPTYPE_5 << 10) | (SPI_OPTYPE_4 <<  8) | \
+		    (SPI_OPTYPE_3 <<  6) | (SPI_OPTYPE_2 <<  4) | \
+		    (SPI_OPTYPE_1 <<  2) | (SPI_OPTYPE_0 <<  0))
+#define SPI_OPMENU_UPPER ((SPI_OPMENU_7 << 24) | (SPI_OPMENU_6 << 16) | \
+			  (SPI_OPMENU_5 <<  8) | (SPI_OPMENU_4 <<  0))
+#define SPI_OPMENU_LOWER ((SPI_OPMENU_3 << 24) | (SPI_OPMENU_2 << 16) | \
+			  (SPI_OPMENU_1 <<  8) | (SPI_OPMENU_0 <<  0))
+
 DECLARE_GLOBAL_DATA_PTR;
 
 #ifdef DEBUG_TRACE
@@ -111,6 +144,17 @@ static int ich9_can_do_33mhz(struct udevice *dev)
 	return speed == 1;
 }
 
+/*
+ * Configure SPI controller so that the Linux MTD driver can fully
+ * access the SPI NOR chip
+ */
+static void spi_controller_config(struct ich_spi_priv *ctlr)
+{
+	ich_writew(ctlr, SPI_OPTYPE, ctlr->optype);
+	ich_writel(ctlr, SPI_OPMENU_LOWER, ctlr->opmenu);
+	ich_writel(ctlr, SPI_OPMENU_UPPER, ctlr->opmenu + sizeof(u32));
+}
+
 static int ich_init_controller(struct udevice *dev,
 			       struct ich_spi_platdata *plat,
 			       struct ich_spi_priv *ctlr)
@@ -172,6 +216,13 @@ static int ich_init_controller(struct udevice *dev,
 
 	ich_set_bbar(ctlr, 0);
 
+	/*
+	 * Configure the SPI-NOR controller in a way that the Linux
+	 * MTD SPI-NOR device driver has full read-write access to
+	 * the SPI-NOR chips
+	 */
+	spi_controller_config(ctlr);
+
 	return 0;
 }
 
-- 
2.11.0