spi: fsl_qspi: Add controller busy check before new spi operation
It is recommended to check either controller is free to take
new spi action. The IP_ACC and AHB_ACC bits indicates that
the controller is busy in IP or AHB mode respectively.
And the BUSY bit indicates that controller is currently
busy handling a transaction to an external flash device
Signed-off-by: Suresh Gupta <suresh.gupta@nxp.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
index 1dfa89a..8753ed9 100644
--- a/drivers/spi/fsl_qspi.c
+++ b/drivers/spi/fsl_qspi.c
@@ -14,6 +14,7 @@
#include <dm.h>
#include <errno.h>
#include <watchdog.h>
+#include <wait_bit.h>
#include "fsl_qspi.h"
DECLARE_GLOBAL_DATA_PTR;
@@ -991,7 +992,7 @@
struct fsl_qspi_platdata *plat = dev_get_platdata(bus);
struct fsl_qspi_priv *priv = dev_get_priv(bus);
struct dm_spi_bus *dm_spi_bus;
- int i;
+ int i, ret;
dm_spi_bus = bus->uclass_priv;
@@ -1011,6 +1012,18 @@
priv->flash_num = plat->flash_num;
priv->num_chipselect = plat->num_chipselect;
+ /* make sure controller is not busy anywhere */
+ ret = wait_for_bit(__func__, &priv->regs->sr,
+ QSPI_SR_BUSY_MASK |
+ QSPI_SR_AHB_ACC_MASK |
+ QSPI_SR_IP_ACC_MASK,
+ false, 100, false);
+
+ if (ret) {
+ debug("ERROR : The controller is busy\n");
+ return ret;
+ }
+
mcr_val = qspi_read32(priv->flags, &priv->regs->mcr);
qspi_write32(priv->flags, &priv->regs->mcr,
QSPI_MCR_RESERVED_MASK | QSPI_MCR_MDIS_MASK |
@@ -1156,10 +1169,23 @@
struct fsl_qspi_priv *priv;
struct udevice *bus;
struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
+ int ret;
bus = dev->parent;
priv = dev_get_priv(bus);
+ /* make sure controller is not busy anywhere */
+ ret = wait_for_bit(__func__, &priv->regs->sr,
+ QSPI_SR_BUSY_MASK |
+ QSPI_SR_AHB_ACC_MASK |
+ QSPI_SR_IP_ACC_MASK,
+ false, 100, false);
+
+ if (ret) {
+ debug("ERROR : The controller is busy\n");
+ return ret;
+ }
+
priv->cur_amba_base = priv->amba_base[slave_plat->cs];
qspi_module_disable(priv, 0);