[PATCH v2 0/3] spi: atmel: add support to FIFOs and the internal chip-select

[PATCH v2 0/3] spi: atmel: add support to FIFOs and the internal chip-select

[Cyrille Pitchen]

ChangeLog

v2:
- read the Status Register to clear its RX FIFO Threshold Flag (RXFTHF) before
  writing into the IER to enable the RXFTHF interrupt.
- remove the reset of the FIFO Mode Register (FMR) at the end of transfers
  because setting the RX FIFO Threshold to 0 also sets the RXFTHF bit in SR.
- add a 3rd patch in the series to update the documentation of DT bindings.

v1:
This series of patches add support to features introduced by the Atmel sama5d2x
SoC

Cyrille Pitchen (3):
  spi: atmel: add support for the internal chip-select of the spi
    controller
  spi: atmel: update DT bindings documentation
  spi: atmel: add support to FIFOs

 .../devicetree/bindings/spi/spi_atmel.txt          |   8 +-
 drivers/spi/spi-atmel.c                            | 276 +++++++++++++++++++--
 2 files changed, 264 insertions(+), 20 deletions(-)

-- 
1.8.2.2

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[PATCH v2 1/3] spi: atmel: add support for the internal chip-select of the spi controller

[Cyrille Pitchen]

This patch relies on the CSAAT (Chip Select Active After Transfer) feature
introduced by the version 2 of the spi controller. This new mode allows to
use properly the internal chip-select output pin of the spi controller
instead of using external gpios. Consequently, the "cs-gpios" device-tree
property becomes optional.

When the new CSAAT bit is set into the Chip Select Register, the internal
chip-select output pin remains asserted till both the following conditions
become true:
- the LASTXFER bit is set into the Control Register (or the Transmit Data
  Register)
- the Transmit Data Register and its shift register are empty.

WARNING: if the LASTXFER bit is set into the Control Register then new
data are written into the Transmit Data Register fast enough to keep its
shifter not empty, the chip-select output pin remains asserted. Only when
the shifter becomes empty, the chip-select output pin is unasserted.

When the CSAAT bit is clear in the Chip Select Register, the LASTXFER bit
is ignored in both the Control Register and the Transmit Data Register.
The internal chip-select output pin remains active as long as the Transmit
Data Register or its shift register are not empty.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-atmel.c | 37 ++++++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 9 deletions(-)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index a2f40b1..aa7d202 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -246,6 +246,7 @@ struct atmel_spi {
 
 	bool			use_dma;
 	bool			use_pdc;
+	bool			use_cs_gpios;
 	/* dmaengine data */
 	struct atmel_spi_dma	dma;
 
@@ -321,7 +322,8 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 		}
 
 		mr = spi_readl(as, MR);
-		gpio_set_value(asd->npcs_pin, active);
+		if (as->use_cs_gpios)
+			gpio_set_value(asd->npcs_pin, active);
 	} else {
 		u32 cpol = (spi->mode & SPI_CPOL) ? SPI_BIT(CPOL) : 0;
 		int i;
@@ -337,7 +339,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 
 		mr = spi_readl(as, MR);
 		mr = SPI_BFINS(PCS, ~(1 << spi->chip_select), mr);
-		if (spi->chip_select != 0)
+		if (as->use_cs_gpios && spi->chip_select != 0)
 			gpio_set_value(asd->npcs_pin, active);
 		spi_writel(as, MR, mr);
 	}
@@ -366,7 +368,9 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
 			asd->npcs_pin, active ? " (low)" : "",
 			mr);
 
-	if (atmel_spi_is_v2(as) || spi->chip_select != 0)
+	if (!as->use_cs_gpios)
+		spi_writel(as, CR, SPI_BIT(LASTXFER));
+	else if (atmel_spi_is_v2(as) || spi->chip_select != 0)
 		gpio_set_value(asd->npcs_pin, !active);
 }
 
@@ -996,6 +1000,8 @@ static int atmel_spi_setup(struct spi_device *spi)
 		csr |= SPI_BIT(CPOL);
 	if (!(spi->mode & SPI_CPHA))
 		csr |= SPI_BIT(NCPHA);
+	if (!as->use_cs_gpios)
+		csr |= SPI_BIT(CSAAT);
 
 	/* DLYBS is mostly irrelevant since we manage chipselect using GPIOs.
 	 *
@@ -1009,7 +1015,9 @@ static int atmel_spi_setup(struct spi_device *spi)
 	/* chipselect must have been muxed as GPIO (e.g. in board setup) */
 	npcs_pin = (unsigned long)spi->controller_data;
 
-	if (gpio_is_valid(spi->cs_gpio))
+	if (!as->use_cs_gpios)
+		npcs_pin = spi->chip_select;
+	else if (gpio_is_valid(spi->cs_gpio))
 		npcs_pin = spi->cs_gpio;
 
 	asd = spi->controller_state;
@@ -1018,15 +1026,19 @@ static int atmel_spi_setup(struct spi_device *spi)
 		if (!asd)
 			return -ENOMEM;
 
-		ret = gpio_request(npcs_pin, dev_name(&spi->dev));
-		if (ret) {
-			kfree(asd);
-			return ret;
+		if (as->use_cs_gpios) {
+			ret = gpio_request(npcs_pin, dev_name(&spi->dev));
+			if (ret) {
+				kfree(asd);
+				return ret;
+			}
+
+			gpio_direction_output(npcs_pin,
+					      !(spi->mode & SPI_CS_HIGH));
 		}
 
 		asd->npcs_pin = npcs_pin;
 		spi->controller_state = asd;
-		gpio_direction_output(npcs_pin, !(spi->mode & SPI_CS_HIGH));
 	}
 
 	asd->csr = csr;
@@ -1338,6 +1350,13 @@ static int atmel_spi_probe(struct platform_device *pdev)
 
 	atmel_get_caps(as);
 
+	as->use_cs_gpios = true;
+	if (atmel_spi_is_v2(as) &&
+	    !of_get_property(pdev->dev.of_node, "cs-gpios", NULL)) {
+		as->use_cs_gpios = false;
+		master->num_chipselect = 4;
+	}
+
 	as->use_dma = false;
 	as->use_pdc = false;
 	if (as->caps.has_dma_support) {
-- 
1.8.2.2

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Re: [PATCH v2 1/3] spi: atmel: add support for the internal chip-select of the spi controller

[Nicolas Ferre]

Le 08/06/2015 18:07, Cyrille Pitchen a écrit :
> This patch relies on the CSAAT (Chip Select Active After Transfer) feature
> introduced by the version 2 of the spi controller. This new mode allows to
> use properly the internal chip-select output pin of the spi controller
> instead of using external gpios. Consequently, the "cs-gpios" device-tree
> property becomes optional.
> 
> When the new CSAAT bit is set into the Chip Select Register, the internal
> chip-select output pin remains asserted till both the following conditions
> become true:
> - the LASTXFER bit is set into the Control Register (or the Transmit Data
>   Register)
> - the Transmit Data Register and its shift register are empty.
> 
> WARNING: if the LASTXFER bit is set into the Control Register then new
> data are written into the Transmit Data Register fast enough to keep its
> shifter not empty, the chip-select output pin remains asserted. Only when
> the shifter becomes empty, the chip-select output pin is unasserted.
> 
> When the CSAAT bit is clear in the Chip Select Register, the LASTXFER bit
> is ignored in both the Control Register and the Transmit Data Register.
> The internal chip-select output pin remains active as long as the Transmit
> Data Register or its shift register are not empty.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>

It seems okay:
Acked-by: Nicolas Ferre <nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>

Thanks.

Some additional changes might be needed: see below...


> ---
>  drivers/spi/spi-atmel.c | 37 ++++++++++++++++++++++++++++---------
>  1 file changed, 28 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
> index a2f40b1..aa7d202 100644
> --- a/drivers/spi/spi-atmel.c
> +++ b/drivers/spi/spi-atmel.c
> @@ -246,6 +246,7 @@ struct atmel_spi {
>  
>  	bool			use_dma;
>  	bool			use_pdc;
> +	bool			use_cs_gpios;
>  	/* dmaengine data */
>  	struct atmel_spi_dma	dma;
>  
> @@ -321,7 +322,8 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
>  		}
>  
>  		mr = spi_readl(as, MR);
> -		gpio_set_value(asd->npcs_pin, active);
> +		if (as->use_cs_gpios)
> +			gpio_set_value(asd->npcs_pin, active);
>  	} else {
>  		u32 cpol = (spi->mode & SPI_CPOL) ? SPI_BIT(CPOL) : 0;
>  		int i;
> @@ -337,7 +339,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
>  
>  		mr = spi_readl(as, MR);
>  		mr = SPI_BFINS(PCS, ~(1 << spi->chip_select), mr);
> -		if (spi->chip_select != 0)
> +		if (as->use_cs_gpios && spi->chip_select != 0)
>  			gpio_set_value(asd->npcs_pin, active);
>  		spi_writel(as, MR, mr);
>  	}

Maybe in a debug function in cs_activate()...

> @@ -366,7 +368,9 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
>  			asd->npcs_pin, active ? " (low)" : "",
>  			mr);
>  
> -	if (atmel_spi_is_v2(as) || spi->chip_select != 0)
> +	if (!as->use_cs_gpios)
> +		spi_writel(as, CR, SPI_BIT(LASTXFER));
> +	else if (atmel_spi_is_v2(as) || spi->chip_select != 0)
>  		gpio_set_value(asd->npcs_pin, !active);
>  }
>  

... as well as in cs_deactivate(), you need to change the use of
asd->npcs_pin:

        dev_dbg(&spi->dev, "activate %u%s, mr %08x\n",
                        asd->npcs_pin, active ? " (high)" : "",
                        mr);

so that it is still relevant in the !as->use_cs_gpios case...

Bye,

> @@ -996,6 +1000,8 @@ static int atmel_spi_setup(struct spi_device *spi)
>  		csr |= SPI_BIT(CPOL);
>  	if (!(spi->mode & SPI_CPHA))
>  		csr |= SPI_BIT(NCPHA);
> +	if (!as->use_cs_gpios)
> +		csr |= SPI_BIT(CSAAT);
>  
>  	/* DLYBS is mostly irrelevant since we manage chipselect using GPIOs.
>  	 *
> @@ -1009,7 +1015,9 @@ static int atmel_spi_setup(struct spi_device *spi)
>  	/* chipselect must have been muxed as GPIO (e.g. in board setup) */
>  	npcs_pin = (unsigned long)spi->controller_data;
>  
> -	if (gpio_is_valid(spi->cs_gpio))
> +	if (!as->use_cs_gpios)
> +		npcs_pin = spi->chip_select;
> +	else if (gpio_is_valid(spi->cs_gpio))
>  		npcs_pin = spi->cs_gpio;
>  
>  	asd = spi->controller_state;
> @@ -1018,15 +1026,19 @@ static int atmel_spi_setup(struct spi_device *spi)
>  		if (!asd)
>  			return -ENOMEM;
>  
> -		ret = gpio_request(npcs_pin, dev_name(&spi->dev));
> -		if (ret) {
> -			kfree(asd);
> -			return ret;
> +		if (as->use_cs_gpios) {
> +			ret = gpio_request(npcs_pin, dev_name(&spi->dev));
> +			if (ret) {
> +				kfree(asd);
> +				return ret;
> +			}
> +
> +			gpio_direction_output(npcs_pin,
> +					      !(spi->mode & SPI_CS_HIGH));
>  		}
>  
>  		asd->npcs_pin = npcs_pin;
>  		spi->controller_state = asd;
> -		gpio_direction_output(npcs_pin, !(spi->mode & SPI_CS_HIGH));
>  	}
>  
>  	asd->csr = csr;
> @@ -1338,6 +1350,13 @@ static int atmel_spi_probe(struct platform_device *pdev)
>  
>  	atmel_get_caps(as);
>  
> +	as->use_cs_gpios = true;
> +	if (atmel_spi_is_v2(as) &&
> +	    !of_get_property(pdev->dev.of_node, "cs-gpios", NULL)) {
> +		as->use_cs_gpios = false;
> +		master->num_chipselect = 4;
> +	}
> +
>  	as->use_dma = false;
>  	as->use_pdc = false;
>  	if (as->caps.has_dma_support) {
> 


-- 
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[PATCH v2 2/3] spi: atmel: update DT bindings documentation

[Cyrille Pitchen]

- add new property "atmel,fifo-size"
- change "cs-gpios" to optional for SPI controller version >= 2.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
---
 Documentation/devicetree/bindings/spi/spi_atmel.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/spi/spi_atmel.txt b/Documentation/devicetree/bindings/spi/spi_atmel.txt
index 4f8184d..7ef7f6bc 100644
--- a/Documentation/devicetree/bindings/spi/spi_atmel.txt
+++ b/Documentation/devicetree/bindings/spi/spi_atmel.txt
@@ -4,11 +4,16 @@ Required properties:
 - compatible : should be "atmel,at91rm9200-spi".
 - reg: Address and length of the register set for the device
 - interrupts: Should contain spi interrupt
-- cs-gpios: chipselects
+- cs-gpios: chipselects (optional for SPI controller version >= 2 with the
+  Alternative Command Mode).
 - clock-names: tuple listing input clock names.
 	Required elements: "spi_clk"
 - clocks: phandles to input clocks.
 
+Optional properties:
+- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
+  capable SPI controllers.
+
 Example:
 
 spi1: spi@fffcc000 {
@@ -20,6 +25,7 @@ spi1: spi@fffcc000 {
 	clocks = <&spi1_clk>;
 	clock-names = "spi_clk";
 	cs-gpios = <&pioB 3 0>;
+	atmel,fifo-size = <32>;
 	status = "okay";
 
 	mmc-slot@0 {
-- 
1.8.2.2

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Re: [PATCH v2 2/3] spi: atmel: update DT bindings documentation

[Nicolas Ferre]

Le 08/06/2015 18:07, Cyrille Pitchen a écrit :
> - add new property "atmel,fifo-size"
> - change "cs-gpios" to optional for SPI controller version >= 2.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>

Acked-by: Nicolas Ferre <nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>

> ---
>  Documentation/devicetree/bindings/spi/spi_atmel.txt | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/spi/spi_atmel.txt b/Documentation/devicetree/bindings/spi/spi_atmel.txt
> index 4f8184d..7ef7f6bc 100644
> --- a/Documentation/devicetree/bindings/spi/spi_atmel.txt
> +++ b/Documentation/devicetree/bindings/spi/spi_atmel.txt
> @@ -4,11 +4,16 @@ Required properties:
>  - compatible : should be "atmel,at91rm9200-spi".
>  - reg: Address and length of the register set for the device
>  - interrupts: Should contain spi interrupt
> -- cs-gpios: chipselects
> +- cs-gpios: chipselects (optional for SPI controller version >= 2 with the
> +  Alternative Command Mode).
>  - clock-names: tuple listing input clock names.
>  	Required elements: "spi_clk"
>  - clocks: phandles to input clocks.
>  
> +Optional properties:
> +- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
> +  capable SPI controllers.
> +
>  Example:
>  
>  spi1: spi@fffcc000 {
> @@ -20,6 +25,7 @@ spi1: spi@fffcc000 {
>  	clocks = <&spi1_clk>;
>  	clock-names = "spi_clk";
>  	cs-gpios = <&pioB 3 0>;
> +	atmel,fifo-size = <32>;
>  	status = "okay";
>  
>  	mmc-slot@0 {
> 


-- 
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[PATCH v2 3/3] spi: atmel: add support to FIFOs

[Cyrille Pitchen]

To enable the FIFO feature a "atmel,fifo-size" attribute with a strictly
positive value must be added into the node of the device-tree describing
the spi controller.

When FIFOs are enabled, the RX one is forced to operate in SINGLE data
mode because this driver configures the spi controller as a master. In
master mode only, the Received Data Register has an additionnal Peripheral
Chip Select field, which prevents us from reading more than a single data
at each register access.

Besides, the TX FIFO operates in MULTIPLE data mode. However, even when a
8bit data size is used, only two data by access could be written into the
Transmit Data Register. Indeed the first data has to be written into the
lowest 16 bits whereas the second data has to be written into the highest
16 bits of the TDR. When DMA transfers are used to send data, we don't
rework the transmit buffer to cope with this hardware limitation: the
additional copies required to prepare a new input buffer suited to both
the DMA controller and the spi controller would waste all the benefit of
the DMA transfer. Instead, the DMA controller is configured to write only
one data at time into the TDR.

In pio mode, two data are written in the TDR in a single access.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-atmel.c | 239 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 229 insertions(+), 10 deletions(-)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index aa7d202..0b2f2ad 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -41,6 +41,8 @@
 #define SPI_CSR1				0x0034
 #define SPI_CSR2				0x0038
 #define SPI_CSR3				0x003c
+#define SPI_FMR					0x0040
+#define SPI_FLR					0x0044
 #define SPI_VERSION				0x00fc
 #define SPI_RPR					0x0100
 #define SPI_RCR					0x0104
@@ -62,6 +64,14 @@
 #define SPI_SWRST_SIZE				1
 #define SPI_LASTXFER_OFFSET			24
 #define SPI_LASTXFER_SIZE			1
+#define SPI_TXFCLR_OFFSET			16
+#define SPI_TXFCLR_SIZE				1
+#define SPI_RXFCLR_OFFSET			17
+#define SPI_RXFCLR_SIZE				1
+#define SPI_FIFOEN_OFFSET			30
+#define SPI_FIFOEN_SIZE				1
+#define SPI_FIFODIS_OFFSET			31
+#define SPI_FIFODIS_SIZE			1
 
 /* Bitfields in MR */
 #define SPI_MSTR_OFFSET				0
@@ -114,6 +124,22 @@
 #define SPI_TXEMPTY_SIZE			1
 #define SPI_SPIENS_OFFSET			16
 #define SPI_SPIENS_SIZE				1
+#define SPI_TXFEF_OFFSET			24
+#define SPI_TXFEF_SIZE				1
+#define SPI_TXFFF_OFFSET			25
+#define SPI_TXFFF_SIZE				1
+#define SPI_TXFTHF_OFFSET			26
+#define SPI_TXFTHF_SIZE				1
+#define SPI_RXFEF_OFFSET			27
+#define SPI_RXFEF_SIZE				1
+#define SPI_RXFFF_OFFSET			28
+#define SPI_RXFFF_SIZE				1
+#define SPI_RXFTHF_OFFSET			29
+#define SPI_RXFTHF_SIZE				1
+#define SPI_TXFPTEF_OFFSET			30
+#define SPI_TXFPTEF_SIZE			1
+#define SPI_RXFPTEF_OFFSET			31
+#define SPI_RXFPTEF_SIZE			1
 
 /* Bitfields in CSR0 */
 #define SPI_CPOL_OFFSET				0
@@ -157,6 +183,22 @@
 #define SPI_TXTDIS_OFFSET			9
 #define SPI_TXTDIS_SIZE				1
 
+/* Bitfields in FMR */
+#define SPI_TXRDYM_OFFSET			0
+#define SPI_TXRDYM_SIZE				2
+#define SPI_RXRDYM_OFFSET			4
+#define SPI_RXRDYM_SIZE				2
+#define SPI_TXFTHRES_OFFSET			16
+#define SPI_TXFTHRES_SIZE			6
+#define SPI_RXFTHRES_OFFSET			24
+#define SPI_RXFTHRES_SIZE			6
+
+/* Bitfields in FLR */
+#define SPI_TXFL_OFFSET				0
+#define SPI_TXFL_SIZE				6
+#define SPI_RXFL_OFFSET				16
+#define SPI_RXFL_SIZE				6
+
 /* Constants for BITS */
 #define SPI_BITS_8_BPT				0
 #define SPI_BITS_9_BPT				1
@@ -167,6 +209,9 @@
 #define SPI_BITS_14_BPT				6
 #define SPI_BITS_15_BPT				7
 #define SPI_BITS_16_BPT				8
+#define SPI_ONE_DATA				0
+#define SPI_TWO_DATA				1
+#define SPI_FOUR_DATA				2
 
 /* Bit manipulation macros */
 #define SPI_BIT(name) \
@@ -185,11 +230,31 @@
 	__raw_readl((port)->regs + SPI_##reg)
 #define spi_writel(port, reg, value) \
 	__raw_writel((value), (port)->regs + SPI_##reg)
+
+#define spi_readw(port, reg) \
+	__raw_readw((port)->regs + SPI_##reg)
+#define spi_writew(port, reg, value) \
+	__raw_writew((value), (port)->regs + SPI_##reg)
+
+#define spi_readb(port, reg) \
+	__raw_readb((port)->regs + SPI_##reg)
+#define spi_writeb(port, reg, value) \
+	__raw_writeb((value), (port)->regs + SPI_##reg)
 #else
 #define spi_readl(port, reg) \
 	readl_relaxed((port)->regs + SPI_##reg)
 #define spi_writel(port, reg, value) \
 	writel_relaxed((value), (port)->regs + SPI_##reg)
+
+#define spi_readw(port, reg) \
+	readw_relaxed((port)->regs + SPI_##reg)
+#define spi_writew(port, reg, value) \
+	writew_relaxed((value), (port)->regs + SPI_##reg)
+
+#define spi_readb(port, reg) \
+	readb_relaxed((port)->regs + SPI_##reg)
+#define spi_writeb(port, reg, value) \
+	writeb_relaxed((value), (port)->regs + SPI_##reg)
 #endif
 /* use PIO for small transfers, avoiding DMA setup/teardown overhead and
  * cache operations; better heuristics consider wordsize and bitrate.
@@ -252,6 +317,8 @@ struct atmel_spi {
 
 	bool			keep_cs;
 	bool			cs_active;
+
+	u32			fifo_size;
 };
 
 /* Controller-specific per-slave state */
@@ -410,6 +477,20 @@ static int atmel_spi_dma_slave_config(struct atmel_spi *as,
 	slave_config->dst_maxburst = 1;
 	slave_config->device_fc = false;
 
+	/*
+	 * This driver uses fixed peripheral select mode (PS bit set to '0' in
+	 * the Mode Register).
+	 * So according to the datasheet, when FIFOs are available (and
+	 * enabled), the Transmit FIFO operates in Multiple Data Mode.
+	 * In this mode, up to 2 data, not 4, can be written into the Transmit
+	 * Data Register in a single access.
+	 * However, the first data has to be written into the lowest 16 bits and
+	 * the second data into the highest 16 bits of the Transmit
+	 * Data Register. For 8bit data (the most frequent case), it would
+	 * require to rework tx_buf so each data would actualy fit 16 bits.
+	 * So we'd rather write only one data at the time. Then the transmit
+	 * path works the same whether FIFOs are available (and enabled) or not.
+	 */
 	slave_config->direction = DMA_MEM_TO_DEV;
 	if (dmaengine_slave_config(as->dma.chan_tx, slave_config)) {
 		dev_err(&as->pdev->dev,
@@ -417,6 +498,14 @@ static int atmel_spi_dma_slave_config(struct atmel_spi *as,
 		err = -EINVAL;
 	}
 
+	/*
+	 * This driver configures the spi controller for master mode (MSTR bit
+	 * set to '1' in the Mode Register).
+	 * So according to the datasheet, when FIFOs are available (and
+	 * enabled), the Receive FIFO operates in Single Data Mode.
+	 * So the receive path works the same whether FIFOs are available (and
+	 * enabled) or not.
+	 */
 	slave_config->direction = DMA_DEV_TO_MEM;
 	if (dmaengine_slave_config(as->dma.chan_rx, slave_config)) {
 		dev_err(&as->pdev->dev,
@@ -506,10 +595,10 @@ static void dma_callback(void *data)
 }
 
 /*
- * Next transfer using PIO.
+ * Next transfer using PIO without FIFO.
  */
-static void atmel_spi_next_xfer_pio(struct spi_master *master,
-				struct spi_transfer *xfer)
+static void atmel_spi_next_xfer_single(struct spi_master *master,
+				       struct spi_transfer *xfer)
 {
 	struct atmel_spi	*as = spi_master_get_devdata(master);
 	unsigned long xfer_pos = xfer->len - as->current_remaining_bytes;
@@ -542,6 +631,93 @@ static void atmel_spi_next_xfer_pio(struct spi_master *master,
 }
 
 /*
+ * Next transfer using PIO with FIFO.
+ */
+static void atmel_spi_next_xfer_fifo(struct spi_master *master,
+				     struct spi_transfer *xfer)
+{
+	struct atmel_spi *as = spi_master_get_devdata(master);
+	u32 size = min_t(u32, as->current_remaining_bytes, as->fifo_size);
+	u32 offset = xfer->len - as->current_remaining_bytes;
+	const u16 *words = (const u16 *)((u8 *)xfer->tx_buf + offset);
+	const u8  *bytes = (const u8  *)((u8 *)xfer->tx_buf + offset);
+	u16 td0, td1;
+	u32 fifomr;
+
+	dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_fifo\n");
+
+	/* Flush RX and TX FIFOs */
+	spi_writel(as, CR, SPI_BIT(RXFCLR) | SPI_BIT(TXFCLR));
+	while (spi_readl(as, FLR))
+		cpu_relax();
+
+	/* Set RX FIFO Threshold to transfer size */
+	fifomr = spi_readl(as, FMR);
+	spi_writel(as, FMR, SPI_BFINS(RXFTHRES, size, fifomr));
+
+	/* Clear FIFO flags in the Status Register */
+	(void)spi_readl(as, SR);
+
+	/* Fill TX FIFO */
+	while (size >= 2) {
+		if (xfer->tx_buf) {
+			if (xfer->bits_per_word > 8) {
+				td0 = *words++;
+				td1 = *words++;
+			} else {
+				td0 = *bytes++;
+				td1 = *bytes++;
+			}
+		} else {
+			td0 = 0;
+			td1 = 0;
+		}
+
+		spi_writel(as, TDR, (td1 << 16) | td0);
+		size -= 2;
+	}
+
+	if (size) {
+		if (xfer->tx_buf) {
+			if (xfer->bits_per_word > 8)
+				td0 = *words++;
+			else
+				td0 = *bytes++;
+		} else {
+			td0 = 0;
+		}
+
+		spi_writew(as, TDR, td0);
+		size--;
+	}
+
+	dev_dbg(master->dev.parent,
+		"  start fifo xfer %p: len %u tx %p rx %p bitpw %d\n",
+		xfer, xfer->len, xfer->tx_buf, xfer->rx_buf,
+		xfer->bits_per_word);
+
+	/*
+	 * Enable RX FIFO Threshold Flag interrupt to be notified about
+	 * transfer completion.
+	 */
+	spi_writel(as, IER, SPI_BIT(RXFTHF) | SPI_BIT(OVRES));
+}
+
+/*
+ * Next transfer using PIO.
+ */
+static void atmel_spi_next_xfer_pio(struct spi_master *master,
+				    struct spi_transfer *xfer)
+{
+	struct atmel_spi *as = spi_master_get_devdata(master);
+
+	if (as->fifo_size)
+		atmel_spi_next_xfer_fifo(master, xfer);
+	else
+		atmel_spi_next_xfer_single(master, xfer);
+}
+
+/*
  * Submit next transfer for DMA.
  */
 static int atmel_spi_next_xfer_dma_submit(struct spi_master *master,
@@ -843,13 +1019,8 @@ static void atmel_spi_disable_pdc_transfer(struct atmel_spi *as)
 	spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
 }
 
-/* Called from IRQ
- *
- * Must update "current_remaining_bytes" to keep track of data
- * to transfer.
- */
 static void
-atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
+atmel_spi_pump_single_data(struct atmel_spi *as, struct spi_transfer *xfer)
 {
 	u8		*rxp;
 	u16		*rxp16;
@@ -876,6 +1047,47 @@ atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
 	}
 }
 
+static void
+atmel_spi_pump_fifo_data(struct atmel_spi *as, struct spi_transfer *xfer)
+{
+	u32 fifolr = spi_readl(as, FLR);
+	u32 size = SPI_BFEXT(RXFL, fifolr);
+	u32 offset = xfer->len - as->current_remaining_bytes;
+	u16 *words = (u16 *)((u8 *)xfer->rx_buf + offset);
+	u8  *bytes = (u8  *)((u8 *)xfer->rx_buf + offset);
+	u16 rd; /* RD field is the lowest 16 bits of RDR */
+
+	if (xfer->bits_per_word > 8)
+		as->current_remaining_bytes -= 2 * size;
+	else
+		as->current_remaining_bytes -= size;
+
+	while (size) {
+		rd = spi_readl(as, RDR);
+		if (xfer->rx_buf) {
+			if (xfer->bits_per_word > 8)
+				*words++ = rd;
+			else
+				*bytes++ = rd;
+		}
+		size--;
+	}
+}
+
+/* Called from IRQ
+ *
+ * Must update "current_remaining_bytes" to keep track of data
+ * to transfer.
+ */
+static void
+atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
+{
+	if (as->fifo_size)
+		atmel_spi_pump_fifo_data(as, xfer);
+	else
+		atmel_spi_pump_single_data(as, xfer);
+}
+
 /* Interrupt
  *
  * No need for locking in this Interrupt handler: done_status is the
@@ -916,7 +1128,7 @@ atmel_spi_pio_interrupt(int irq, void *dev_id)
 
 		complete(&as->xfer_completion);
 
-	} else if (pending & SPI_BIT(RDRF)) {
+	} else if (pending & (SPI_BIT(RDRF) | SPI_BIT(RXFTHF))) {
 		atmel_spi_lock(as);
 
 		if (as->current_remaining_bytes) {
@@ -1399,6 +1611,13 @@ static int atmel_spi_probe(struct platform_device *pdev)
 		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
 	spi_writel(as, CR, SPI_BIT(SPIEN));
 
+	as->fifo_size = 0;
+	if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size",
+				  &as->fifo_size)) {
+		dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size);
+		spi_writel(as, CR, SPI_BIT(FIFOEN));
+	}
+
 	/* go! */
 	dev_info(&pdev->dev, "Atmel SPI Controller at 0x%08lx (irq %d)\n",
 			(unsigned long)regs->start, irq);
-- 
1.8.2.2

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Re: [PATCH v2 3/3] spi: atmel: add support to FIFOs

[Nicolas Ferre]

Le 08/06/2015 18:07, Cyrille Pitchen a écrit :
> To enable the FIFO feature a "atmel,fifo-size" attribute with a strictly
> positive value must be added into the node of the device-tree describing
> the spi controller.
> 
> When FIFOs are enabled, the RX one is forced to operate in SINGLE data
> mode because this driver configures the spi controller as a master. In
> master mode only, the Received Data Register has an additionnal Peripheral
> Chip Select field, which prevents us from reading more than a single data
> at each register access.
> 
> Besides, the TX FIFO operates in MULTIPLE data mode. However, even when a
> 8bit data size is used, only two data by access could be written into the
> Transmit Data Register. Indeed the first data has to be written into the
> lowest 16 bits whereas the second data has to be written into the highest
> 16 bits of the TDR. When DMA transfers are used to send data, we don't
> rework the transmit buffer to cope with this hardware limitation: the
> additional copies required to prepare a new input buffer suited to both
> the DMA controller and the spi controller would waste all the benefit of
> the DMA transfer. Instead, the DMA controller is configured to write only
> one data at time into the TDR.
> 
> In pio mode, two data are written in the TDR in a single access.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
> ---
>  drivers/spi/spi-atmel.c | 239 ++++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 229 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
> index aa7d202..0b2f2ad 100644
> --- a/drivers/spi/spi-atmel.c
> +++ b/drivers/spi/spi-atmel.c
> @@ -41,6 +41,8 @@
>  #define SPI_CSR1				0x0034
>  #define SPI_CSR2				0x0038
>  #define SPI_CSR3				0x003c
> +#define SPI_FMR					0x0040
> +#define SPI_FLR					0x0044
>  #define SPI_VERSION				0x00fc
>  #define SPI_RPR					0x0100
>  #define SPI_RCR					0x0104
> @@ -62,6 +64,14 @@
>  #define SPI_SWRST_SIZE				1
>  #define SPI_LASTXFER_OFFSET			24
>  #define SPI_LASTXFER_SIZE			1
> +#define SPI_TXFCLR_OFFSET			16
> +#define SPI_TXFCLR_SIZE				1
> +#define SPI_RXFCLR_OFFSET			17
> +#define SPI_RXFCLR_SIZE				1
> +#define SPI_FIFOEN_OFFSET			30
> +#define SPI_FIFOEN_SIZE				1
> +#define SPI_FIFODIS_OFFSET			31
> +#define SPI_FIFODIS_SIZE			1
>  
>  /* Bitfields in MR */
>  #define SPI_MSTR_OFFSET				0
> @@ -114,6 +124,22 @@
>  #define SPI_TXEMPTY_SIZE			1
>  #define SPI_SPIENS_OFFSET			16
>  #define SPI_SPIENS_SIZE				1
> +#define SPI_TXFEF_OFFSET			24
> +#define SPI_TXFEF_SIZE				1
> +#define SPI_TXFFF_OFFSET			25
> +#define SPI_TXFFF_SIZE				1
> +#define SPI_TXFTHF_OFFSET			26
> +#define SPI_TXFTHF_SIZE				1
> +#define SPI_RXFEF_OFFSET			27
> +#define SPI_RXFEF_SIZE				1
> +#define SPI_RXFFF_OFFSET			28
> +#define SPI_RXFFF_SIZE				1
> +#define SPI_RXFTHF_OFFSET			29
> +#define SPI_RXFTHF_SIZE				1
> +#define SPI_TXFPTEF_OFFSET			30
> +#define SPI_TXFPTEF_SIZE			1
> +#define SPI_RXFPTEF_OFFSET			31
> +#define SPI_RXFPTEF_SIZE			1
>  
>  /* Bitfields in CSR0 */
>  #define SPI_CPOL_OFFSET				0
> @@ -157,6 +183,22 @@
>  #define SPI_TXTDIS_OFFSET			9
>  #define SPI_TXTDIS_SIZE				1
>  
> +/* Bitfields in FMR */
> +#define SPI_TXRDYM_OFFSET			0
> +#define SPI_TXRDYM_SIZE				2
> +#define SPI_RXRDYM_OFFSET			4
> +#define SPI_RXRDYM_SIZE				2
> +#define SPI_TXFTHRES_OFFSET			16
> +#define SPI_TXFTHRES_SIZE			6
> +#define SPI_RXFTHRES_OFFSET			24
> +#define SPI_RXFTHRES_SIZE			6
> +
> +/* Bitfields in FLR */
> +#define SPI_TXFL_OFFSET				0
> +#define SPI_TXFL_SIZE				6
> +#define SPI_RXFL_OFFSET				16
> +#define SPI_RXFL_SIZE				6
> +
>  /* Constants for BITS */
>  #define SPI_BITS_8_BPT				0
>  #define SPI_BITS_9_BPT				1
> @@ -167,6 +209,9 @@
>  #define SPI_BITS_14_BPT				6
>  #define SPI_BITS_15_BPT				7
>  #define SPI_BITS_16_BPT				8
> +#define SPI_ONE_DATA				0
> +#define SPI_TWO_DATA				1
> +#define SPI_FOUR_DATA				2
>  
>  /* Bit manipulation macros */
>  #define SPI_BIT(name) \
> @@ -185,11 +230,31 @@
>  	__raw_readl((port)->regs + SPI_##reg)
>  #define spi_writel(port, reg, value) \
>  	__raw_writel((value), (port)->regs + SPI_##reg)
> +
> +#define spi_readw(port, reg) \
> +	__raw_readw((port)->regs + SPI_##reg)
> +#define spi_writew(port, reg, value) \
> +	__raw_writew((value), (port)->regs + SPI_##reg)
> +
> +#define spi_readb(port, reg) \
> +	__raw_readb((port)->regs + SPI_##reg)
> +#define spi_writeb(port, reg, value) \
> +	__raw_writeb((value), (port)->regs + SPI_##reg)
>  #else
>  #define spi_readl(port, reg) \
>  	readl_relaxed((port)->regs + SPI_##reg)
>  #define spi_writel(port, reg, value) \
>  	writel_relaxed((value), (port)->regs + SPI_##reg)
> +
> +#define spi_readw(port, reg) \
> +	readw_relaxed((port)->regs + SPI_##reg)
> +#define spi_writew(port, reg, value) \
> +	writew_relaxed((value), (port)->regs + SPI_##reg)
> +
> +#define spi_readb(port, reg) \
> +	readb_relaxed((port)->regs + SPI_##reg)
> +#define spi_writeb(port, reg, value) \
> +	writeb_relaxed((value), (port)->regs + SPI_##reg)
>  #endif
>  /* use PIO for small transfers, avoiding DMA setup/teardown overhead and
>   * cache operations; better heuristics consider wordsize and bitrate.
> @@ -252,6 +317,8 @@ struct atmel_spi {
>  
>  	bool			keep_cs;
>  	bool			cs_active;
> +
> +	u32			fifo_size;
>  };
>  
>  /* Controller-specific per-slave state */
> @@ -410,6 +477,20 @@ static int atmel_spi_dma_slave_config(struct atmel_spi *as,
>  	slave_config->dst_maxburst = 1;
>  	slave_config->device_fc = false;
>  
> +	/*
> +	 * This driver uses fixed peripheral select mode (PS bit set to '0' in
> +	 * the Mode Register).
> +	 * So according to the datasheet, when FIFOs are available (and
> +	 * enabled), the Transmit FIFO operates in Multiple Data Mode.
> +	 * In this mode, up to 2 data, not 4, can be written into the Transmit
> +	 * Data Register in a single access.
> +	 * However, the first data has to be written into the lowest 16 bits and
> +	 * the second data into the highest 16 bits of the Transmit
> +	 * Data Register. For 8bit data (the most frequent case), it would
> +	 * require to rework tx_buf so each data would actualy fit 16 bits.
> +	 * So we'd rather write only one data at the time. Then the transmit
> +	 * path works the same whether FIFOs are available (and enabled) or not.
> +	 */
>  	slave_config->direction = DMA_MEM_TO_DEV;
>  	if (dmaengine_slave_config(as->dma.chan_tx, slave_config)) {
>  		dev_err(&as->pdev->dev,
> @@ -417,6 +498,14 @@ static int atmel_spi_dma_slave_config(struct atmel_spi *as,
>  		err = -EINVAL;
>  	}
>  
> +	/*
> +	 * This driver configures the spi controller for master mode (MSTR bit
> +	 * set to '1' in the Mode Register).
> +	 * So according to the datasheet, when FIFOs are available (and
> +	 * enabled), the Receive FIFO operates in Single Data Mode.
> +	 * So the receive path works the same whether FIFOs are available (and
> +	 * enabled) or not.
> +	 */
>  	slave_config->direction = DMA_DEV_TO_MEM;
>  	if (dmaengine_slave_config(as->dma.chan_rx, slave_config)) {
>  		dev_err(&as->pdev->dev,
> @@ -506,10 +595,10 @@ static void dma_callback(void *data)
>  }
>  
>  /*
> - * Next transfer using PIO.
> + * Next transfer using PIO without FIFO.
>   */
> -static void atmel_spi_next_xfer_pio(struct spi_master *master,
> -				struct spi_transfer *xfer)
> +static void atmel_spi_next_xfer_single(struct spi_master *master,
> +				       struct spi_transfer *xfer)
>  {
>  	struct atmel_spi	*as = spi_master_get_devdata(master);
>  	unsigned long xfer_pos = xfer->len - as->current_remaining_bytes;
> @@ -542,6 +631,93 @@ static void atmel_spi_next_xfer_pio(struct spi_master *master,
>  }
>  
>  /*
> + * Next transfer using PIO with FIFO.
> + */
> +static void atmel_spi_next_xfer_fifo(struct spi_master *master,
> +				     struct spi_transfer *xfer)
> +{
> +	struct atmel_spi *as = spi_master_get_devdata(master);
> +	u32 size = min_t(u32, as->current_remaining_bytes, as->fifo_size);

It seems by reading the rest of your patch that size is a number of data
(8 or 16 bits) not a number of bytes. So, It seems that this "min()"
operation isn't good.
Moreover, I would change this variable name here and in the other
functions: data_nbr, xfer_data, or a similar name would be better IMO...


> +	u32 offset = xfer->len - as->current_remaining_bytes;
> +	const u16 *words = (const u16 *)((u8 *)xfer->tx_buf + offset);
> +	const u8  *bytes = (const u8  *)((u8 *)xfer->tx_buf + offset);
> +	u16 td0, td1;
> +	u32 fifomr;
> +
> +	dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_fifo\n");
> +
> +	/* Flush RX and TX FIFOs */
> +	spi_writel(as, CR, SPI_BIT(RXFCLR) | SPI_BIT(TXFCLR));
> +	while (spi_readl(as, FLR))
> +		cpu_relax();
> +
> +	/* Set RX FIFO Threshold to transfer size */
> +	fifomr = spi_readl(as, FMR);
> +	spi_writel(as, FMR, SPI_BFINS(RXFTHRES, size, fifomr));
> +
> +	/* Clear FIFO flags in the Status Register */
> +	(void)spi_readl(as, SR);
> +
> +	/* Fill TX FIFO */
> +	while (size >= 2) {
> +		if (xfer->tx_buf) {
> +			if (xfer->bits_per_word > 8) {
> +				td0 = *words++;
> +				td1 = *words++;
> +			} else {
> +				td0 = *bytes++;
> +				td1 = *bytes++;
> +			}
> +		} else {
> +			td0 = 0;
> +			td1 = 0;
> +		}
> +
> +		spi_writel(as, TDR, (td1 << 16) | td0);
> +		size -= 2;

Yes, now that I know that "size" is not in bytes, this operation makes
more sense to me.

> +	}
> +
> +	if (size) {
> +		if (xfer->tx_buf) {
> +			if (xfer->bits_per_word > 8)
> +				td0 = *words++;
> +			else
> +				td0 = *bytes++;
> +		} else {
> +			td0 = 0;
> +		}
> +
> +		spi_writew(as, TDR, td0);
> +		size--;
> +	}
> +
> +	dev_dbg(master->dev.parent,
> +		"  start fifo xfer %p: len %u tx %p rx %p bitpw %d\n",
> +		xfer, xfer->len, xfer->tx_buf, xfer->rx_buf,
> +		xfer->bits_per_word);
> +
> +	/*
> +	 * Enable RX FIFO Threshold Flag interrupt to be notified about
> +	 * transfer completion.
> +	 */
> +	spi_writel(as, IER, SPI_BIT(RXFTHF) | SPI_BIT(OVRES));
> +}
> +
> +/*
> + * Next transfer using PIO.
> + */
> +static void atmel_spi_next_xfer_pio(struct spi_master *master,
> +				    struct spi_transfer *xfer)
> +{
> +	struct atmel_spi *as = spi_master_get_devdata(master);
> +
> +	if (as->fifo_size)
> +		atmel_spi_next_xfer_fifo(master, xfer);
> +	else
> +		atmel_spi_next_xfer_single(master, xfer);
> +}
> +
> +/*
>   * Submit next transfer for DMA.
>   */
>  static int atmel_spi_next_xfer_dma_submit(struct spi_master *master,
> @@ -843,13 +1019,8 @@ static void atmel_spi_disable_pdc_transfer(struct atmel_spi *as)
>  	spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
>  }
>  
> -/* Called from IRQ
> - *
> - * Must update "current_remaining_bytes" to keep track of data
> - * to transfer.
> - */
>  static void
> -atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
> +atmel_spi_pump_single_data(struct atmel_spi *as, struct spi_transfer *xfer)
>  {
>  	u8		*rxp;
>  	u16		*rxp16;
> @@ -876,6 +1047,47 @@ atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
>  	}
>  }
>  
> +static void
> +atmel_spi_pump_fifo_data(struct atmel_spi *as, struct spi_transfer *xfer)
> +{
> +	u32 fifolr = spi_readl(as, FLR);
> +	u32 size = SPI_BFEXT(RXFL, fifolr);

Ditto.

> +	u32 offset = xfer->len - as->current_remaining_bytes;
> +	u16 *words = (u16 *)((u8 *)xfer->rx_buf + offset);
> +	u8  *bytes = (u8  *)((u8 *)xfer->rx_buf + offset);
> +	u16 rd; /* RD field is the lowest 16 bits of RDR */
> +
> +	if (xfer->bits_per_word > 8)
> +		as->current_remaining_bytes -= 2 * size;
> +	else
> +		as->current_remaining_bytes -= size;

Yes, the operation is in data, not bytes => okay.

> +
> +	while (size) {
> +		rd = spi_readl(as, RDR);
> +		if (xfer->rx_buf) {
> +			if (xfer->bits_per_word > 8)
> +				*words++ = rd;
> +			else
> +				*bytes++ = rd;
> +		}
> +		size--;
> +	}
> +}
> +
> +/* Called from IRQ
> + *
> + * Must update "current_remaining_bytes" to keep track of data
> + * to transfer.
> + */
> +static void
> +atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
> +{
> +	if (as->fifo_size)
> +		atmel_spi_pump_fifo_data(as, xfer);
> +	else
> +		atmel_spi_pump_single_data(as, xfer);
> +}
> +
>  /* Interrupt
>   *
>   * No need for locking in this Interrupt handler: done_status is the
> @@ -916,7 +1128,7 @@ atmel_spi_pio_interrupt(int irq, void *dev_id)
>  
>  		complete(&as->xfer_completion);
>  
> -	} else if (pending & SPI_BIT(RDRF)) {
> +	} else if (pending & (SPI_BIT(RDRF) | SPI_BIT(RXFTHF))) {
>  		atmel_spi_lock(as);
>  
>  		if (as->current_remaining_bytes) {
> @@ -1399,6 +1611,13 @@ static int atmel_spi_probe(struct platform_device *pdev)
>  		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
>  	spi_writel(as, CR, SPI_BIT(SPIEN));
>  
> +	as->fifo_size = 0;
> +	if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size",
> +				  &as->fifo_size)) {
> +		dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size);
> +		spi_writel(as, CR, SPI_BIT(FIFOEN));
> +	}
> +
>  	/* go! */
>  	dev_info(&pdev->dev, "Atmel SPI Controller at 0x%08lx (irq %d)\n",
>  			(unsigned long)regs->start, irq);
> 

Otherwise, it looks okay: thanks!

Bye,
-- 
Nicolas Ferre
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