[PATCH v2 0/7] spi: spi-zyqnmp-gqspi: Add tap delay and Versal platform support

[PATCH v2 0/7] spi: spi-zyqnmp-gqspi: Add tap delay and Versal platform support

[Amit Kumar Mahapatra]

This patch series:
- Fixes kernel-doc warnings in GQSPI driver.
- Avoids setting CPOL, CPHA & baud rate multiple times.
- Adds Versal platform support in GQSPI driver.
- Adds tap delay support in GQSPI driver.
---
BRANCH: mtd/next

changes in v2:
 - Used of_device_get_match_data( ) API to retrive match->data.
 - Removed oneOf and used only enum.
--
Amit Kumar Mahapatra (5):
  spi: spi-zynqmp-gqspi: Fix kernel-doc warnings
  spi: spi-zynqmp-gqspi: Set CPOL and CPHA during hardware init
  spi: spi-zynqmp-gqspi: Avoid setting baud rate multiple times for same
    SPI frequency
  dt-bindings: spi: spi-zynqmp-qspi: Add support for Xilinx Versal QSPI
  spi: spi-zynqmp-gqspi: Add tap delay support for GQSPI controller on
    Versal platform

Naga Sureshkumar Relli (1):
  spi: spi-zynqmp-gqspi: Add tap delay support for ZynqMP GQSPI
    Controller

Rajan Vaja (1):
  firmware: xilinx: Add qspi firmware interface

 .../bindings/spi/spi-zynqmp-qspi.yaml         |   4 +-
 drivers/firmware/xilinx/zynqmp.c              |   7 +
 drivers/spi/spi-zynqmp-gqspi.c                | 189 ++++++++++++++----
 include/linux/firmware/xlnx-zynqmp.h          |  19 ++
 4 files changed, 182 insertions(+), 37 deletions(-)

-- 
2.25.1


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[PATCH v2 1/7] spi: spi-zynqmp-gqspi: Fix kernel-doc warnings

[Amit Kumar Mahapatra]

Document zynqmp_qspi ctrl and op_lock member description. It also adds
return documentation for 'zynqmp_qspi_setuprxdma' and zynqmp_qspi_read_op.

Fixes below kernel-doc warnings-

spi-zynqmp-gqspi.c:178: warning: Function parameter or member 'ctlr' not
described in 'zynqmp_qspi'
spi-zynqmp-gqspi.c:178: warning: Function parameter or member 'op_lock'
not described in 'zynqmp_qspi'

spi-zynqmp-gqspi.c:737: warning: No description found for return value of
'zynqmp_qspi_setuprxdma'
spi-zynqmp-gqspi.c:822: warning: No description found for return value of
'zynqmp_qspi_read_op'

Signed-off-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
---
 drivers/spi/spi-zynqmp-gqspi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index 2b5afae8ff7f..b07bb97cf874 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -139,6 +139,7 @@ enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
 
 /**
  * struct zynqmp_qspi - Defines qspi driver instance
+ * @ctlr:		Pointer to the spi controller information
  * @regs:		Virtual address of the QSPI controller registers
  * @refclk:		Pointer to the peripheral clock
  * @pclk:		Pointer to the APB clock
@@ -155,6 +156,7 @@ enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
  * @genfifoentry:	Used for storing the genfifoentry instruction.
  * @mode:		Defines the mode in which QSPI is operating
  * @data_completion:	completion structure
+ * @op_lock:		Operational lock
  */
 struct zynqmp_qspi {
 	struct spi_controller *ctlr;
@@ -732,6 +734,8 @@ static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
 /**
  * zynqmp_qspi_setuprxdma - This function sets up the RX DMA operation
  * @xqspi:	xqspi is a pointer to the GQSPI instance.
+ *
+ * Return:	0 on success; error value otherwise.
  */
 static int zynqmp_qspi_setuprxdma(struct zynqmp_qspi *xqspi)
 {
@@ -816,6 +820,8 @@ static void zynqmp_qspi_write_op(struct zynqmp_qspi *xqspi, u8 tx_nbits,
  * @rx_nbits:	Receive buswidth.
  * @genfifoentry:	genfifoentry is pointer to the variable in which
  *			GENFIFO	mask is returned to calling function
+ *
+ * Return:	0 on success; error value otherwise.
  */
 static int zynqmp_qspi_read_op(struct zynqmp_qspi *xqspi, u8 rx_nbits,
 				u32 genfifoentry)
-- 
2.25.1


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[PATCH v2 2/7] spi: spi-zynqmp-gqspi: Set CPOL and CPHA during hardware init

[Amit Kumar Mahapatra]

During every transfer GQSPI driver writes the CPOL & CPHA values to the
configuration register. But the CPOL & CPHA values do not change in between
multiple transfers, so moved the CPOL & CPHA initialization to hardware
init so that the values are written only once.

Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
---
 drivers/spi/spi-zynqmp-gqspi.c | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index b07bb97cf874..6771496c1f86 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -264,7 +264,9 @@ static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr,
  *	- Enable manual slave select
  *	- Enable manual start
  *	- Deselect all the chip select lines
- *	- Set the little endian mode of TX FIFO and
+ *	- Set the little endian mode of TX FIFO
+ *	- Set clock phase
+ *	- Set clock polarity and
  *	- Enable the QSPI controller
  */
 static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi)
@@ -303,10 +305,17 @@ static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi)
 	config_reg |= GQSPI_CFG_WP_HOLD_MASK;
 	/* Clear pre-scalar by default */
 	config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
-	/* CPHA 0 */
-	config_reg &= ~GQSPI_CFG_CLK_PHA_MASK;
-	/* CPOL 0 */
-	config_reg &= ~GQSPI_CFG_CLK_POL_MASK;
+	/* Set CPHA */
+	if (xqspi->ctlr->mode_bits & SPI_CPHA)
+		config_reg |= GQSPI_CFG_CLK_PHA_MASK;
+	else
+		config_reg &= ~GQSPI_CFG_CLK_PHA_MASK;
+	/* Set CPOL */
+	if (xqspi->ctlr->mode_bits & SPI_CPOL)
+		config_reg |= GQSPI_CFG_CLK_POL_MASK;
+	else
+		config_reg &= ~GQSPI_CFG_CLK_POL_MASK;
+
 	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 
 	/* Clear the TX and RX FIFO */
@@ -463,14 +472,6 @@ static int zynqmp_qspi_config_op(struct zynqmp_qspi *xqspi,
 
 	config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
 
-	/* Set the QSPI clock phase and clock polarity */
-	config_reg &= (~GQSPI_CFG_CLK_PHA_MASK) & (~GQSPI_CFG_CLK_POL_MASK);
-
-	if (qspi->mode & SPI_CPHA)
-		config_reg |= GQSPI_CFG_CLK_PHA_MASK;
-	if (qspi->mode & SPI_CPOL)
-		config_reg |= GQSPI_CFG_CLK_POL_MASK;
-
 	config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
 	config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
 	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
@@ -1162,6 +1163,9 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 		goto clk_dis_all;
 	}
 
+	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
+		SPI_TX_DUAL | SPI_TX_QUAD;
+
 	/* QSPI controller initializations */
 	zynqmp_qspi_init_hw(xqspi);
 
@@ -1188,8 +1192,6 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 	ctlr->setup = zynqmp_qspi_setup_op;
 	ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
 	ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
-	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
-			    SPI_TX_DUAL | SPI_TX_QUAD;
 	ctlr->dev.of_node = np;
 	ctlr->auto_runtime_pm = true;
 
-- 
2.25.1


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[PATCH v2 3/7] spi: spi-zynqmp-gqspi: Avoid setting baud rate multiple times for same SPI frequency

[Amit Kumar Mahapatra]

During every transfer the GQSPI driver configures the baud rate value. But
when there is no change in the SPI clock frequency the driver should avoid
rewriting the same baud rate value to the configuration register. With this
patch the GQSPI driver rewrites the baud rate value if there is a change in
SPI clock frequency.

Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
---
 drivers/spi/spi-zynqmp-gqspi.c | 49 ++++++++++++++++++++++++----------
 1 file changed, 35 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index 6771496c1f86..024085098515 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -157,6 +157,7 @@ enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
  * @mode:		Defines the mode in which QSPI is operating
  * @data_completion:	completion structure
  * @op_lock:		Operational lock
+ * @speed_hz:		Current SPI bus clock speed in hz
  */
 struct zynqmp_qspi {
 	struct spi_controller *ctlr;
@@ -177,6 +178,7 @@ struct zynqmp_qspi {
 	enum mode_type mode;
 	struct completion data_completion;
 	struct mutex op_lock;
+	u32 speed_hz;
 };
 
 /**
@@ -271,7 +273,8 @@ static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr,
  */
 static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi)
 {
-	u32 config_reg;
+	u32 config_reg, baud_rate_val = 0;
+	ulong clk_rate;
 
 	/* Select the GQSPI mode */
 	zynqmp_gqspi_write(xqspi, GQSPI_SEL_OFST, GQSPI_SEL_MASK);
@@ -316,6 +319,16 @@ static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi)
 	else
 		config_reg &= ~GQSPI_CFG_CLK_POL_MASK;
 
+	/* Set the clock frequency */
+	clk_rate = clk_get_rate(xqspi->refclk);
+	while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
+	       (clk_rate /
+		(GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > xqspi->speed_hz)
+		baud_rate_val++;
+
+	config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
+	config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
+
 	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
 
 	/* Clear the TX and RX FIFO */
@@ -459,22 +472,29 @@ static int zynqmp_qspi_config_op(struct zynqmp_qspi *xqspi,
 				 struct spi_device *qspi)
 {
 	ulong clk_rate;
-	u32 config_reg, baud_rate_val = 0;
+	u32 config_reg, req_speed_hz, baud_rate_val = 0;
 
-	/* Set the clock frequency */
-	/* If req_hz == 0, default to lowest speed */
-	clk_rate = clk_get_rate(xqspi->refclk);
+	req_speed_hz = qspi->max_speed_hz;
 
-	while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
-	       (clk_rate /
-		(GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > qspi->max_speed_hz)
-		baud_rate_val++;
+	if (xqspi->speed_hz != req_speed_hz) {
+		xqspi->speed_hz = req_speed_hz;
 
-	config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
+		/* Set the clock frequency */
+		/* If req_speed_hz == 0, default to lowest speed */
+		clk_rate = clk_get_rate(xqspi->refclk);
 
-	config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
-	config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
-	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
+		while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
+		       (clk_rate /
+			(GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) >
+		       req_speed_hz)
+			baud_rate_val++;
+
+		config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
+
+		config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
+		config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
+		zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
+	}
 	return 0;
 }
 
@@ -1165,6 +1185,8 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 
 	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
 		SPI_TX_DUAL | SPI_TX_QUAD;
+	ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
+	xqspi->speed_hz = ctlr->max_speed_hz;
 
 	/* QSPI controller initializations */
 	zynqmp_qspi_init_hw(xqspi);
@@ -1190,7 +1212,6 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 	ctlr->num_chipselect = GQSPI_DEFAULT_NUM_CS;
 	ctlr->mem_ops = &zynqmp_qspi_mem_ops;
 	ctlr->setup = zynqmp_qspi_setup_op;
-	ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
 	ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
 	ctlr->dev.of_node = np;
 	ctlr->auto_runtime_pm = true;
-- 
2.25.1


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[PATCH v2 4/7] firmware: xilinx: Add qspi firmware interface

[Amit Kumar Mahapatra]

From: Rajan Vaja <rajan.vaja@xilinx.com>

Add support for QSPI ioctl functions and enums.

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
---
 drivers/firmware/xilinx/zynqmp.c     |  7 +++++++
 include/linux/firmware/xlnx-zynqmp.h | 19 +++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 7977a494a651..b119f170437a 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -829,6 +829,13 @@ int zynqmp_pm_read_pggs(u32 index, u32 *value)
 }
 EXPORT_SYMBOL_GPL(zynqmp_pm_read_pggs);
 
+int zynqmp_pm_set_tapdelay_bypass(u32 index, u32 value)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, 0, IOCTL_SET_TAPDELAY_BYPASS,
+				   index, value, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_set_tapdelay_bypass);
+
 /**
  * zynqmp_pm_set_boot_health_status() - PM API for setting healthy boot status
  * @value:	Status value to be written
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 1ec73d5352c3..b38d12b6040f 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -134,6 +134,7 @@ enum pm_ret_status {
 };
 
 enum pm_ioctl_id {
+	IOCTL_SET_TAPDELAY_BYPASS = 4,
 	IOCTL_SD_DLL_RESET = 6,
 	IOCTL_SET_SD_TAPDELAY = 7,
 	IOCTL_SET_PLL_FRAC_MODE = 8,
@@ -380,6 +381,18 @@ enum zynqmp_pm_shutdown_subtype {
 	ZYNQMP_PM_SHUTDOWN_SUBTYPE_SYSTEM = 2,
 };
 
+enum tap_delay_signal_type {
+	PM_TAPDELAY_NAND_DQS_IN = 0,
+	PM_TAPDELAY_NAND_DQS_OUT = 1,
+	PM_TAPDELAY_QSPI = 2,
+	PM_TAPDELAY_MAX = 3,
+};
+
+enum tap_delay_bypass_ctrl {
+	PM_TAPDELAY_BYPASS_DISABLE = 0,
+	PM_TAPDELAY_BYPASS_ENABLE = 1,
+};
+
 enum ospi_mux_select_type {
 	PM_OSPI_MUX_SEL_DMA = 0,
 	PM_OSPI_MUX_SEL_LINEAR = 1,
@@ -451,6 +464,7 @@ int zynqmp_pm_write_ggs(u32 index, u32 value);
 int zynqmp_pm_read_ggs(u32 index, u32 *value);
 int zynqmp_pm_write_pggs(u32 index, u32 value);
 int zynqmp_pm_read_pggs(u32 index, u32 *value);
+int zynqmp_pm_set_tapdelay_bypass(u32 index, u32 value);
 int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype);
 int zynqmp_pm_set_boot_health_status(u32 value);
 int zynqmp_pm_pinctrl_request(const u32 pin);
@@ -659,6 +673,11 @@ static inline int zynqmp_pm_read_pggs(u32 index, u32 *value)
 	return -ENODEV;
 }
 
+static inline int zynqmp_pm_set_tapdelay_bypass(u32 index, u32 value)
+{
+	return -ENODEV;
+}
+
 static inline int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype)
 {
 	return -ENODEV;
-- 
2.25.1


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[PATCH v2 5/7] spi: spi-zynqmp-gqspi: Add tap delay support for ZynqMP GQSPI Controller

[Amit Kumar Mahapatra]

From: Naga Sureshkumar Relli <nagasure@xilinx.com>

GQSPI controller uses the internal clock for loopback mode. The loopback
mode is used with the high-speed Quad SPI timing mode, where the memory
interface clock needs to be greater than 40 MHz. Based on the tap delay
value programmed, the internal clock is delayed and used for capturing
the data.
Based upon the frequency of operation this patch sets the recommended
tap delay values.

Signed-off-by: Naga Sureshkumar Relli <nagasure@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
---
 drivers/spi/spi-zynqmp-gqspi.c | 48 +++++++++++++++++++++++++++++++---
 1 file changed, 44 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index 024085098515..0e6423ff33f4 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -48,6 +48,7 @@
 #define GQSPI_QSPIDMA_DST_I_MASK_OFST	0x00000820
 #define GQSPI_QSPIDMA_DST_ADDR_OFST	0x00000800
 #define GQSPI_QSPIDMA_DST_ADDR_MSB_OFST 0x00000828
+#define GQSPI_DATA_DLY_ADJ_OFST         0x000001F8
 
 /* GQSPI register bit masks */
 #define GQSPI_SEL_MASK				0x00000001
@@ -133,6 +134,15 @@
 #define GQSPI_SELECT_MODE_QUADSPI	0x4
 #define GQSPI_DMA_UNALIGN		0x3
 #define GQSPI_DEFAULT_NUM_CS	1	/* Default number of chip selects */
+#define GQSPI_USE_DATA_DLY              0x1
+#define GQSPI_USE_DATA_DLY_SHIFT        31
+#define GQSPI_DATA_DLY_ADJ_VALUE        0x2
+#define GQSPI_DATA_DLY_ADJ_SHIFT        28
+
+#define GQSPI_FREQ_37_5MHZ      37500000
+#define GQSPI_FREQ_40MHZ        40000000
+#define GQSPI_FREQ_100MHZ       100000000
+#define GQSPI_FREQ_150MHZ       150000000
 
 #define SPI_AUTOSUSPEND_TIMEOUT		3000
 enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
@@ -251,6 +261,37 @@ static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr,
 	}
 }
 
+/**
+ * zynqmp_qspi_set_tapdelay:	To configure qspi tap delays
+ * @xqspi:		Pointer to the zynqmp_qspi structure
+ * @baudrateval:	Buadrate to configure
+ */
+static void zynqmp_qspi_set_tapdelay(struct zynqmp_qspi *xqspi, u32 baudrateval)
+{
+	u32 lpbkdlyadj = 0, datadlyadj = 0, clk_rate;
+	u32 reqhz = 0;
+
+	clk_rate = clk_get_rate(xqspi->refclk);
+	reqhz = (clk_rate / (GQSPI_BAUD_DIV_SHIFT << baudrateval));
+
+	if (reqhz <= GQSPI_FREQ_40MHZ) {
+		zynqmp_pm_set_tapdelay_bypass(PM_TAPDELAY_QSPI,
+					      PM_TAPDELAY_BYPASS_ENABLE);
+	} else if (reqhz <= GQSPI_FREQ_100MHZ) {
+		zynqmp_pm_set_tapdelay_bypass(PM_TAPDELAY_QSPI,
+					      PM_TAPDELAY_BYPASS_ENABLE);
+		lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
+		datadlyadj |= ((GQSPI_USE_DATA_DLY <<
+				GQSPI_USE_DATA_DLY_SHIFT)
+				| (GQSPI_DATA_DLY_ADJ_VALUE <<
+					GQSPI_DATA_DLY_ADJ_SHIFT));
+	} else if (reqhz <= GQSPI_FREQ_150MHZ) {
+		lpbkdlyadj |= GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK;
+	}
+	zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST, lpbkdlyadj);
+	zynqmp_gqspi_write(xqspi, GQSPI_DATA_DLY_ADJ_OFST, datadlyadj);
+}
+
 /**
  * zynqmp_qspi_init_hw - Initialize the hardware
  * @xqspi:	Pointer to the zynqmp_qspi structure
@@ -330,16 +371,14 @@ static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi)
 	config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
 
 	zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
+	/* Set the tapdelay for clock frequency */
+	zynqmp_qspi_set_tapdelay(xqspi, baud_rate_val);
 
 	/* Clear the TX and RX FIFO */
 	zynqmp_gqspi_write(xqspi, GQSPI_FIFO_CTRL_OFST,
 			   GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK |
 			   GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK |
 			   GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK);
-	/* Set by default to allow for high frequencies */
-	zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST,
-			   zynqmp_gqspi_read(xqspi, GQSPI_LPBK_DLY_ADJ_OFST) |
-			   GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
 	/* Reset thresholds */
 	zynqmp_gqspi_write(xqspi, GQSPI_TX_THRESHOLD_OFST,
 			   GQSPI_TX_FIFO_THRESHOLD_RESET_VAL);
@@ -494,6 +533,7 @@ static int zynqmp_qspi_config_op(struct zynqmp_qspi *xqspi,
 		config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
 		config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
 		zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
+		zynqmp_qspi_set_tapdelay(xqspi, baud_rate_val);
 	}
 	return 0;
 }
-- 
2.25.1


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[PATCH v2 6/7] dt-bindings: spi: spi-zynqmp-qspi: Add support for Xilinx Versal QSPI

[Amit Kumar Mahapatra]

Add new compatible to support QSPI controller on Xilinx Versal SoCs.

Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
---
 Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml b/Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml
index ea72c8001256..37108bfdcd81 100644
--- a/Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml
@@ -14,7 +14,9 @@ allOf:
 
 properties:
   compatible:
-    const: xlnx,zynqmp-qspi-1.0
+    enum:
+      - xlnx,zynqmp-qspi-1.0
+      - xlnx,versal-qspi-1.0
 
   reg:
     maxItems: 2
-- 
2.25.1


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Re: [PATCH v2 6/7] dt-bindings: spi: spi-zynqmp-qspi: Add support for Xilinx Versal QSPI

[Krzysztof Kozlowski]

On 15/09/2022 13:07, Amit Kumar Mahapatra wrote:
> Add new compatible to support QSPI controller on Xilinx Versal SoCs.
> 
> Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>

Use subject prefixes matching the subsystem (git log --oneline -- ...).

> ---
>  Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml b/Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml
> index ea72c8001256..37108bfdcd81 100644
> --- a/Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml
> +++ b/Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.yaml
> @@ -14,7 +14,9 @@ allOf:
>  
>  properties:
>    compatible:
> -    const: xlnx,zynqmp-qspi-1.0
> +    enum:
> +      - xlnx,zynqmp-qspi-1.0
> +      - xlnx,versal-qspi-1.0

Alphabetical order please.

Best regards,
Krzysztof

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[PATCH v2 7/7] spi: spi-zynqmp-gqspi: Add tap delay support for GQSPI controller on Versal platform

[Amit Kumar Mahapatra]

This patch adds tap delay support for GQSPI controller on Versal
platform.

Signed-off-by: Naga Sureshkumar Relli <nagasure@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
---
 drivers/spi/spi-zynqmp-gqspi.c | 86 ++++++++++++++++++++++++++--------
 1 file changed, 67 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index 0e6423ff33f4..223c321fc609 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/of_irq.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/spi/spi.h>
@@ -34,6 +35,7 @@
 #define GQSPI_RXD_OFST			0x00000120
 #define GQSPI_TX_THRESHOLD_OFST		0x00000128
 #define GQSPI_RX_THRESHOLD_OFST		0x0000012C
+#define IOU_TAPDLY_BYPASS_OFST		0x0000003C
 #define GQSPI_LPBK_DLY_ADJ_OFST		0x00000138
 #define GQSPI_GEN_FIFO_OFST		0x00000140
 #define GQSPI_SEL_OFST			0x00000144
@@ -134,10 +136,17 @@
 #define GQSPI_SELECT_MODE_QUADSPI	0x4
 #define GQSPI_DMA_UNALIGN		0x3
 #define GQSPI_DEFAULT_NUM_CS	1	/* Default number of chip selects */
+#define GQSPI_LPBK_DLY_ADJ_DLY_1	0x1
+#define GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT	3
 #define GQSPI_USE_DATA_DLY              0x1
 #define GQSPI_USE_DATA_DLY_SHIFT        31
 #define GQSPI_DATA_DLY_ADJ_VALUE        0x2
 #define GQSPI_DATA_DLY_ADJ_SHIFT        28
+#define TAP_DLY_BYPASS_LQSPI_RX_VALUE	0x1
+#define TAP_DLY_BYPASS_LQSPI_RX_SHIFT	2
+
+/* set to differentiate versal from zynqmp, 1=versal, 0=zynqmp */
+#define QSPI_QUIRK_HAS_TAPDELAY	BIT(0)
 
 #define GQSPI_FREQ_37_5MHZ      37500000
 #define GQSPI_FREQ_40MHZ        40000000
@@ -147,6 +156,14 @@
 #define SPI_AUTOSUSPEND_TIMEOUT		3000
 enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
 
+/**
+ * struct qspi_platform_data - zynqmp qspi platform data structure
+ * @quirks:	Flags is used to identify the platform
+ */
+struct qspi_platform_data {
+	u32 quirks;
+};
+
 /**
  * struct zynqmp_qspi - Defines qspi driver instance
  * @ctlr:		Pointer to the spi controller information
@@ -167,7 +184,9 @@ enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
  * @mode:		Defines the mode in which QSPI is operating
  * @data_completion:	completion structure
  * @op_lock:		Operational lock
+
  * @speed_hz:		Current SPI bus clock speed in hz
+ * @has_tapdelay:	Used for tapdelay register available in qspi
  */
 struct zynqmp_qspi {
 	struct spi_controller *ctlr;
@@ -189,6 +208,7 @@ struct zynqmp_qspi {
 	struct completion data_completion;
 	struct mutex op_lock;
 	u32 speed_hz;
+	bool has_tapdelay;
 };
 
 /**
@@ -268,26 +288,46 @@ static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr,
  */
 static void zynqmp_qspi_set_tapdelay(struct zynqmp_qspi *xqspi, u32 baudrateval)
 {
-	u32 lpbkdlyadj = 0, datadlyadj = 0, clk_rate;
+	u32 tapdlybypass = 0, lpbkdlyadj = 0, datadlyadj = 0, clk_rate;
 	u32 reqhz = 0;
 
 	clk_rate = clk_get_rate(xqspi->refclk);
 	reqhz = (clk_rate / (GQSPI_BAUD_DIV_SHIFT << baudrateval));
 
-	if (reqhz <= GQSPI_FREQ_40MHZ) {
-		zynqmp_pm_set_tapdelay_bypass(PM_TAPDELAY_QSPI,
-					      PM_TAPDELAY_BYPASS_ENABLE);
-	} else if (reqhz <= GQSPI_FREQ_100MHZ) {
-		zynqmp_pm_set_tapdelay_bypass(PM_TAPDELAY_QSPI,
-					      PM_TAPDELAY_BYPASS_ENABLE);
-		lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
-		datadlyadj |= ((GQSPI_USE_DATA_DLY <<
-				GQSPI_USE_DATA_DLY_SHIFT)
-				| (GQSPI_DATA_DLY_ADJ_VALUE <<
-					GQSPI_DATA_DLY_ADJ_SHIFT));
-	} else if (reqhz <= GQSPI_FREQ_150MHZ) {
-		lpbkdlyadj |= GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK;
+	if (!xqspi->has_tapdelay) {
+		if (reqhz <= GQSPI_FREQ_40MHZ) {
+			zynqmp_pm_set_tapdelay_bypass(PM_TAPDELAY_QSPI,
+						      PM_TAPDELAY_BYPASS_ENABLE);
+		} else if (reqhz <= GQSPI_FREQ_100MHZ) {
+			zynqmp_pm_set_tapdelay_bypass(PM_TAPDELAY_QSPI,
+						      PM_TAPDELAY_BYPASS_ENABLE);
+			lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
+			datadlyadj |= ((GQSPI_USE_DATA_DLY <<
+					GQSPI_USE_DATA_DLY_SHIFT)
+					| (GQSPI_DATA_DLY_ADJ_VALUE <<
+						GQSPI_DATA_DLY_ADJ_SHIFT));
+		} else if (reqhz <= GQSPI_FREQ_150MHZ) {
+			lpbkdlyadj |= GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK;
+		}
+	} else {
+		if (reqhz <= GQSPI_FREQ_37_5MHZ) {
+			tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
+					TAP_DLY_BYPASS_LQSPI_RX_SHIFT);
+		} else if (reqhz <= GQSPI_FREQ_100MHZ) {
+			tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
+					TAP_DLY_BYPASS_LQSPI_RX_SHIFT);
+			lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
+			datadlyadj |= (GQSPI_USE_DATA_DLY <<
+					GQSPI_USE_DATA_DLY_SHIFT);
+		} else if (reqhz <= GQSPI_FREQ_150MHZ) {
+			lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK
+				       | (GQSPI_LPBK_DLY_ADJ_DLY_1 <<
+					       GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT));
+		}
+		zynqmp_gqspi_write(xqspi,
+				   IOU_TAPDLY_BYPASS_OFST, tapdlybypass);
 	}
+
 	zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST, lpbkdlyadj);
 	zynqmp_gqspi_write(xqspi, GQSPI_DATA_DLY_ADJ_OFST, datadlyadj);
 }
@@ -1147,6 +1187,15 @@ static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(zynqmp_qspi_suspend, zynqmp_qspi_resume)
 };
 
+static const struct qspi_platform_data versal_qspi_def = {
+	.quirks = QSPI_QUIRK_HAS_TAPDELAY,
+};
+
+static const struct of_device_id zynqmp_qspi_of_match[] = {
+	{ .compatible = "xlnx,zynqmp-qspi-1.0"},
+	{ .compatible = "xlnx,versal-qspi-1.0", .data = &versal_qspi_def },
+	{ /* End of table */ }
+};
 static const struct spi_controller_mem_ops zynqmp_qspi_mem_ops = {
 	.exec_op = zynqmp_qspi_exec_op,
 };
@@ -1166,6 +1215,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 	struct zynqmp_qspi *xqspi;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
+	const struct qspi_platform_data *p_data;
 
 	ctlr = spi_alloc_master(&pdev->dev, sizeof(*xqspi));
 	if (!ctlr)
@@ -1176,6 +1226,9 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 	xqspi->ctlr = ctlr;
 	platform_set_drvdata(pdev, xqspi);
 
+	p_data = of_device_get_match_data(&pdev->dev);
+	if (p_data && (p_data->quirks & QSPI_QUIRK_HAS_TAPDELAY))
+		xqspi->has_tapdelay = true;
 	xqspi->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(xqspi->regs)) {
 		ret = PTR_ERR(xqspi->regs);
@@ -1303,11 +1356,6 @@ static int zynqmp_qspi_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct of_device_id zynqmp_qspi_of_match[] = {
-	{ .compatible = "xlnx,zynqmp-qspi-1.0", },
-	{ /* End of table */ }
-};
-
 MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match);
 
 static struct platform_driver zynqmp_qspi_driver = {
-- 
2.25.1


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