spi: ich: Lock down controller settings if required

Some Intel FSP (like Braswell) does SPI lock-down during the call
to fsp_notify(INIT_PHASE_BOOT). But before SPI lock-down is done,
it's bootloader's responsibility to configure the SPI controller's
opcode registers properly otherwise SPI controller driver doesn't
know how to communicate with the SPI flash device.

Rather than passively doing the opcode configuration, let's add a
simple DTS property "intel,spi-lock-down" and let the driver call
the opcode configuration function if required by such FSP.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/spi/ich.c b/drivers/spi/ich.c
index 22fc83d..927bbd7 100644
--- a/drivers/spi/ich.c
+++ b/drivers/spi/ich.c
@@ -184,6 +184,19 @@ static inline void spi_use_in(struct spi_trans *trans, unsigned bytes)
 	trans->bytesin -= bytes;
 }
 
+static void spi_lock_down(struct ich_spi_platdata *plat, void *sbase)
+{
+	if (plat->ich_version == ICHV_7) {
+		struct ich7_spi_regs *ich7_spi = sbase;
+
+		setbits_le16(&ich7_spi->spis, SPIS_LOCK);
+	} else if (plat->ich_version == ICHV_9) {
+		struct ich9_spi_regs *ich9_spi = sbase;
+
+		setbits_le16(&ich9_spi->hsfs, HSFS_FLOCKDN);
+	}
+}
+
 static bool spi_lock_status(struct ich_spi_platdata *plat, void *sbase)
 {
 	int lock = 0;
@@ -592,6 +605,12 @@ static int ich_spi_probe(struct udevice *dev)
 		return ret;
 	}
 
+	/* Lock down SPI controller settings if required */
+	if (plat->lockdown) {
+		ich_spi_config_opcode(dev);
+		spi_lock_down(plat, priv->base);
+	}
+
 	priv->cur_speed = priv->max_speed;
 
 	return 0;
@@ -662,6 +681,9 @@ static int ich_spi_ofdata_to_platdata(struct udevice *dev)
 			plat->ich_version = ICHV_9;
 	}
 
+	plat->lockdown = fdtdec_get_bool(gd->fdt_blob, node,
+					 "intel,spi-lock-down");
+
 	return ret;
 }