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 the controller is currently
busy handling a transaction to an external flash device
Signed-off-by: Suresh Gupta <suresh.gu...@nxp.com>
---
drivers/spi/fsl_qspi.c | 26 ++++++++++++++++++++++++++
drivers/spi/fsl_qspi.h | 4 ++++
2 files changed, 30 insertions(+)
diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
index 1dfa89a..69e9712 100644
--- a/drivers/spi/fsl_qspi.c
+++ b/drivers/spi/fsl_qspi.c
@@ -165,6 +165,27 @@ static inline u32 qspi_endian_xchg(u32 data)
#endif
}
+static inline u32 qspi_controller_busy(struct fsl_qspi_priv *priv)
+{
+ u32 sr;
+ u32 retry = 5;
+
+ do {
+ sr = qspi_read32(priv->flags, &priv->regs->sr);
+ if ((sr & QSPI_SR_BUSY_MASK) ||
+ (sr & QSPI_SR_AHB_ACC_MASK) ||
+ (sr & QSPI_SR_IP_ACC_MASK)) {
+ debug("The controller is busy, sr = 0x%x\n", sr);
+ udelay(1);
+ } else {
+ break;
+ }
+ } while (--retry);
+
+ return (sr & QSPI_SR_BUSY_MASK) ||
+ (sr & QSPI_SR_AHB_ACC_MASK) || (sr & QSPI_SR_IP_ACC_MASK);
+}
+
static void qspi_set_lut(struct fsl_qspi_priv *priv)
{
struct fsl_qspi_regs *regs = priv->regs;
@@ -765,6 +786,11 @@ int qspi_xfer(struct fsl_qspi_priv *priv, unsigned int
bitlen,
WATCHDOG_RESET();
+ if (qspi_controller_busy(priv)) {
+ printf("ERROR : The controller is busy\n");
+ return -EBUSY;
+ }
+
if (dout) {
if (flags & SPI_XFER_BEGIN) {
priv->cur_seqid = *(u8 *)dout;
diff --git a/drivers/spi/fsl_qspi.h b/drivers/spi/fsl_qspi.h
index 6cb3610..e468eb2 100644
--- a/drivers/spi/fsl_qspi.h
+++ b/drivers/spi/fsl_qspi.h
@@ -105,6 +105,10 @@ struct fsl_qspi_regs {
#define QSPI_RBCT_RXBRD_SHIFT 8
#define QSPI_RBCT_RXBRD_USEIPS (1 << QSPI_RBCT_RXBRD_SHIFT)
+#define QSPI_SR_AHB_ACC_SHIFT 2
+#define QSPI_SR_AHB_ACC_MASK (1 << QSPI_SR_AHB_ACC_SHIFT)
+#define QSPI_SR_IP_ACC_SHIFT 1
+#define QSPI_SR_IP_ACC_MASK (1 << QSPI_SR_IP_ACC_SHIFT)
#define QSPI_SR_BUSY_SHIFT 0
#define QSPI_SR_BUSY_MASK (1 << QSPI_SR_BUSY_SHIFT)
--
1.9.3
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