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spi: atmel-quadspi: Allow setting SMM to classic SPI mode

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Switching between Serial Memory Mode (SMM) and (classic) SPI mode is a
preparation for implementing .xfer() in the future.

Signed-off-by: Alexander Dahl <ada@thorsis.com>
This commit is contained in:
Alexander Dahl
2025-01-23 13:12:13 +01:00
committed by Eugen Hristev
parent 6c1ec67460
commit 1acf68f3d4
1 changed files with 12 additions and 8 deletions
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18
drivers/spi/atmel-quadspi.c
View File

@@ -479,15 +479,19 @@ static bool atmel_qspi_supports_op(struct spi_slave *slave,
} }
/* /*
* If the QSPI controller is set in regular SPI mode, set it in * Switch QSPI controller between regular SPI mode or Serial Memory Mode (SMM).
* Serial Memory Mode (SMM).
*/ */
static int atmel_qspi_set_serial_memory_mode(struct atmel_qspi *aq) static int atmel_qspi_set_serial_memory_mode(struct atmel_qspi *aq,
bool enable)
{ {
int ret = 0; int ret = 0;
if (!(aq->mr & QSPI_MR_SMM)) { /* only write if designated state differs from current state */
if (!!(aq->mr & QSPI_MR_SMM) != enable) {
if (enable)
aq->mr |= QSPI_MR_SMM; aq->mr |= QSPI_MR_SMM;
else
aq->mr &= ~QSPI_MR_SMM;
atmel_qspi_write(aq->mr, aq, QSPI_MR); atmel_qspi_write(aq->mr, aq, QSPI_MR);
if (aq->caps->has_gclk) if (aq->caps->has_gclk)
@@ -576,7 +580,7 @@ static int atmel_qspi_set_cfg(struct atmel_qspi *aq,
ifr |= QSPI_IFR_TFRTYP_MEM; ifr |= QSPI_IFR_TFRTYP_MEM;
} }
mode = atmel_qspi_set_serial_memory_mode(aq); mode = atmel_qspi_set_serial_memory_mode(aq, true);
if (mode < 0) if (mode < 0)
return mode; return mode;
@@ -683,7 +687,7 @@ static int atmel_qspi_sama7g5_set_cfg(struct atmel_qspi *aq,
ifr |= QSPI_IFR_TFRTYP_MEM; ifr |= QSPI_IFR_TFRTYP_MEM;
} }
ret = atmel_qspi_set_serial_memory_mode(aq); ret = atmel_qspi_set_serial_memory_mode(aq, true);
if (ret < 0) if (ret < 0)
return ret; return ret;
@@ -910,7 +914,7 @@ static int atmel_qspi_sama7g5_set_speed(struct udevice *bus, uint hz)
/* Set the QSPI controller by default in Serial Memory Mode */ /* Set the QSPI controller by default in Serial Memory Mode */
aq->mr |= QSPI_MR_DQSDLYEN; aq->mr |= QSPI_MR_DQSDLYEN;
ret = atmel_qspi_set_serial_memory_mode(aq); ret = atmel_qspi_set_serial_memory_mode(aq, true);
if (ret < 0) if (ret < 0)
return ret; return ret;