[PATCH v1 01/14] spi: pxa2xx: Use one point of return when ->probe() fails

[PATCH v1 01/14] spi: pxa2xx: Use one point of return when ->probe() fails

[Andy Shevchenko]

When we can't allocate SPI controller, jump to the error path rather than
return locally.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 0cc767283674..0ef22045b006 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1701,8 +1701,8 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 
 	if (!controller) {
 		dev_err(&pdev->dev, "cannot alloc spi_controller\n");
-		pxa_ssp_free(ssp);
-		return -ENOMEM;
+		status = -ENOMEM;
+		goto out_error_controller_alloc;
 	}
 	drv_data = spi_controller_get_devdata(controller);
 	drv_data->controller = controller;
-- 
2.30.2


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[PATCH v1 02/14] spi: pxa2xx: Utilize MMIO and physical base from struct ssp_device

[Andy Shevchenko]

We have a duplication of MMIO and physical base addresses in
the struct driver_data, get rid of it and reuse members from
struct ssp_device instead.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx-dma.c |  4 ++--
 drivers/spi/spi-pxa2xx.c     |  4 +---
 drivers/spi/spi-pxa2xx.h     | 14 ++++----------
 3 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
index 37567bc7a523..3b27f356a18f 100644
--- a/drivers/spi/spi-pxa2xx-dma.c
+++ b/drivers/spi/spi-pxa2xx-dma.c
@@ -94,14 +94,14 @@ pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data,
 	cfg.direction = dir;
 
 	if (dir == DMA_MEM_TO_DEV) {
-		cfg.dst_addr = drv_data->ssdr_physical;
+		cfg.dst_addr = drv_data->ssp->phys_base + SSDR;
 		cfg.dst_addr_width = width;
 		cfg.dst_maxburst = chip->dma_burst_size;
 
 		sgt = &xfer->tx_sg;
 		chan = drv_data->controller->dma_tx;
 	} else {
-		cfg.src_addr = drv_data->ssdr_physical;
+		cfg.src_addr = drv_data->ssp->phys_base + SSDR;
 		cfg.src_addr_width = width;
 		cfg.src_maxburst = chip->dma_burst_size;
 
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 0ef22045b006..82df028c4a71 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -325,7 +325,7 @@ static void lpss_ssp_setup(struct driver_data *drv_data)
 	u32 value;
 
 	config = lpss_get_config(drv_data);
-	drv_data->lpss_base = drv_data->ioaddr + config->offset;
+	drv_data->lpss_base = drv_data->ssp->mmio_base + config->offset;
 
 	/* Enable software chip select control */
 	value = __lpss_ssp_read_priv(drv_data, config->reg_cs_ctrl);
@@ -1729,8 +1729,6 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 
 	drv_data->ssp_type = ssp->type;
 
-	drv_data->ioaddr = ssp->mmio_base;
-	drv_data->ssdr_physical = ssp->phys_base + SSDR;
 	if (pxa25x_ssp_comp(drv_data)) {
 		switch (drv_data->ssp_type) {
 		case QUARK_X1000_SSP:
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 1400472bc986..ad9980ebefa6 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -33,10 +33,6 @@ struct driver_data {
 	/* PXA hookup */
 	struct pxa2xx_spi_controller *controller_info;
 
-	/* SSP register addresses */
-	void __iomem *ioaddr;
-	phys_addr_t ssdr_physical;
-
 	/* SSP masks*/
 	u32 dma_cr1;
 	u32 int_cr1;
@@ -87,16 +83,14 @@ struct chip_data {
 	void (*cs_control)(u32 command);
 };
 
-static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data,
-				  unsigned reg)
+static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data, u32 reg)
 {
-	return __raw_readl(drv_data->ioaddr + reg);
+	return pxa_ssp_read_reg(drv_data->ssp, reg);
 }
 
-static  inline void pxa2xx_spi_write(const struct driver_data *drv_data,
-				     unsigned reg, u32 val)
+static inline void pxa2xx_spi_write(const struct driver_data *drv_data, u32 reg, u32 val)
 {
-	__raw_writel(val, drv_data->ioaddr + reg);
+	pxa_ssp_write_reg(drv_data->ssp, reg, val);
 }
 
 #define DMA_ALIGNMENT		8
-- 
2.30.2


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[PATCH v1 03/14] spi: pxa2xx: Utilize struct device from struct ssp_device

[Andy Shevchenko]

We have a duplication of struct device in the struct driver_data,
get rid of it and reuse member from struct ssp_device instead.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx-dma.c | 12 +++++-------
 drivers/spi/spi-pxa2xx-pci.c |  1 +
 drivers/spi/spi-pxa2xx.c     | 12 +++++-------
 drivers/spi/spi-pxa2xx.h     |  4 ----
 4 files changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
index 3b27f356a18f..2e4a49567146 100644
--- a/drivers/spi/spi-pxa2xx-dma.c
+++ b/drivers/spi/spi-pxa2xx-dma.c
@@ -111,7 +111,7 @@ pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data,
 
 	ret = dmaengine_slave_config(chan, &cfg);
 	if (ret) {
-		dev_warn(&drv_data->pdev->dev, "DMA slave config failed\n");
+		dev_warn(drv_data->ssp->dev, "DMA slave config failed\n");
 		return NULL;
 	}
 
@@ -125,7 +125,7 @@ irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data)
 
 	status = pxa2xx_spi_read(drv_data, SSSR) & drv_data->mask_sr;
 	if (status & SSSR_ROR) {
-		dev_err(&drv_data->pdev->dev, "FIFO overrun\n");
+		dev_err(drv_data->ssp->dev, "FIFO overrun\n");
 
 		dmaengine_terminate_async(drv_data->controller->dma_rx);
 		dmaengine_terminate_async(drv_data->controller->dma_tx);
@@ -145,16 +145,14 @@ int pxa2xx_spi_dma_prepare(struct driver_data *drv_data,
 
 	tx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_MEM_TO_DEV, xfer);
 	if (!tx_desc) {
-		dev_err(&drv_data->pdev->dev,
-			"failed to get DMA TX descriptor\n");
+		dev_err(drv_data->ssp->dev, "failed to get DMA TX descriptor\n");
 		err = -EBUSY;
 		goto err_tx;
 	}
 
 	rx_desc = pxa2xx_spi_dma_prepare_one(drv_data, DMA_DEV_TO_MEM, xfer);
 	if (!rx_desc) {
-		dev_err(&drv_data->pdev->dev,
-			"failed to get DMA RX descriptor\n");
+		dev_err(drv_data->ssp->dev, "failed to get DMA RX descriptor\n");
 		err = -EBUSY;
 		goto err_rx;
 	}
@@ -191,8 +189,8 @@ void pxa2xx_spi_dma_stop(struct driver_data *drv_data)
 int pxa2xx_spi_dma_setup(struct driver_data *drv_data)
 {
 	struct pxa2xx_spi_controller *pdata = drv_data->controller_info;
-	struct device *dev = &drv_data->pdev->dev;
 	struct spi_controller *controller = drv_data->controller;
+	struct device *dev = drv_data->ssp->dev;
 	dma_cap_mask_t mask;
 
 	dma_cap_zero(mask);
diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
index 14fc41ed2361..f60ed4c62000 100644
--- a/drivers/spi/spi-pxa2xx-pci.c
+++ b/drivers/spi/spi-pxa2xx-pci.c
@@ -239,6 +239,7 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
 	spi_pdata.dma_burst_size = c->dma_burst_size ? c->dma_burst_size : 1;
 
 	ssp = &spi_pdata.ssp;
+	ssp->dev = &dev->dev;
 	ssp->phys_base = pci_resource_start(dev, 0);
 	ssp->mmio_base = pcim_iomap_table(dev)[0];
 	ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 82df028c4a71..e9dddcbd92f1 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -628,7 +628,7 @@ static void int_error_stop(struct driver_data *drv_data, const char* msg)
 	pxa2xx_spi_flush(drv_data);
 	pxa2xx_spi_off(drv_data);
 
-	dev_err(&drv_data->pdev->dev, "%s\n", msg);
+	dev_err(drv_data->ssp->dev, "%s\n", msg);
 
 	drv_data->controller->cur_msg->status = -EIO;
 	spi_finalize_current_transfer(drv_data->controller);
@@ -731,8 +731,7 @@ static void handle_bad_msg(struct driver_data *drv_data)
 		pxa2xx_spi_write(drv_data, SSTO, 0);
 	write_SSSR_CS(drv_data, drv_data->clear_sr);
 
-	dev_err(&drv_data->pdev->dev,
-		"bad message state in interrupt handler\n");
+	dev_err(drv_data->ssp->dev, "bad message state in interrupt handler\n");
 }
 
 static irqreturn_t ssp_int(int irq, void *dev_id)
@@ -748,7 +747,7 @@ static irqreturn_t ssp_int(int irq, void *dev_id)
 	 * the IRQ was not for us (we shouldn't be RPM suspended when the
 	 * interrupt is enabled).
 	 */
-	if (pm_runtime_suspended(&drv_data->pdev->dev))
+	if (pm_runtime_suspended(drv_data->ssp->dev))
 		return IRQ_NONE;
 
 	/*
@@ -1158,7 +1157,7 @@ static int pxa2xx_spi_slave_abort(struct spi_controller *controller)
 	pxa2xx_spi_flush(drv_data);
 	pxa2xx_spi_off(drv_data);
 
-	dev_dbg(&drv_data->pdev->dev, "transfer aborted\n");
+	dev_dbg(drv_data->ssp->dev, "transfer aborted\n");
 
 	drv_data->controller->cur_msg->status = -EINTR;
 	spi_finalize_current_transfer(drv_data->controller);
@@ -1641,7 +1640,7 @@ static int pxa2xx_spi_fw_translate_cs(struct spi_controller *controller,
 {
 	struct driver_data *drv_data = spi_controller_get_devdata(controller);
 
-	if (has_acpi_companion(&drv_data->pdev->dev)) {
+	if (has_acpi_companion(drv_data->ssp->dev)) {
 		switch (drv_data->ssp_type) {
 		/*
 		 * For Atoms the ACPI DeviceSelection used by the Windows
@@ -1707,7 +1706,6 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 	drv_data = spi_controller_get_devdata(controller);
 	drv_data->controller = controller;
 	drv_data->controller_info = platform_info;
-	drv_data->pdev = pdev;
 	drv_data->ssp = ssp;
 
 	controller->dev.of_node = pdev->dev.of_node;
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index ad9980ebefa6..6724d7e056ce 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -12,7 +12,6 @@
 #include <linux/errno.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
-#include <linux/platform_device.h>
 #include <linux/pxa2xx_ssp.h>
 #include <linux/scatterlist.h>
 #include <linux/sizes.h>
@@ -20,9 +19,6 @@
 #include <linux/spi/pxa2xx_spi.h>
 
 struct driver_data {
-	/* Driver model hookup */
-	struct platform_device *pdev;
-
 	/* SSP Info */
 	struct ssp_device *ssp;
 
-- 
2.30.2


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[PATCH v1 04/14] spi: pxa2xx: Replace header inclusions by forward declarations

[Andy Shevchenko]

When the data structure is only referred by pointer, compiler may not need
to see the contents of the data type. Thus, we may replace header inclusions
by respective forward declarations. Due to above add missed headers as well.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx-dma.c   |  6 ++++--
 drivers/spi/spi-pxa2xx.c       |  2 ++
 drivers/spi/spi-pxa2xx.h       | 18 ++++++++++--------
 include/linux/spi/pxa2xx_spi.h |  2 ++
 4 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
index 2e4a49567146..32ab7391396d 100644
--- a/drivers/spi/spi-pxa2xx-dma.c
+++ b/drivers/spi/spi-pxa2xx-dma.c
@@ -9,11 +9,13 @@
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
-#include <linux/pxa2xx_ssp.h>
 #include <linux/scatterlist.h>
 #include <linux/sizes.h>
-#include <linux/spi/spi.h>
+
 #include <linux/spi/pxa2xx_spi.h>
+#include <linux/spi/spi.h>
+
+#include <linux/pxa2xx_ssp.h>
 
 #include "spi-pxa2xx.h"
 
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index e9dddcbd92f1..0296cbdee848 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -9,6 +9,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
+#include <linux/dmaengine.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/gpio/consumer.h>
@@ -25,6 +26,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <linux/slab.h>
+
 #include <linux/spi/pxa2xx_spi.h>
 #include <linux/spi/spi.h>
 
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 6724d7e056ce..739e264feaa6 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -7,16 +7,18 @@
 #ifndef SPI_PXA2XX_H
 #define SPI_PXA2XX_H
 
-#include <linux/atomic.h>
-#include <linux/dmaengine.h>
-#include <linux/errno.h>
-#include <linux/io.h>
 #include <linux/interrupt.h>
-#include <linux/pxa2xx_ssp.h>
-#include <linux/scatterlist.h>
+#include <linux/io.h>
+#include <linux/types.h>
 #include <linux/sizes.h>
-#include <linux/spi/spi.h>
-#include <linux/spi/pxa2xx_spi.h>
+
+#include <linux/pxa2xx_ssp.h>
+
+struct gpio_desc;
+struct pxa2xx_spi_controller;
+struct spi_controller;
+struct spi_device;
+struct spi_transfer;
 
 struct driver_data {
 	/* SSP Info */
diff --git a/include/linux/spi/pxa2xx_spi.h b/include/linux/spi/pxa2xx_spi.h
index 31f00c7f4f59..1e0e2f136319 100644
--- a/include/linux/spi/pxa2xx_spi.h
+++ b/include/linux/spi/pxa2xx_spi.h
@@ -5,6 +5,8 @@
 #ifndef __linux_pxa2xx_spi_h
 #define __linux_pxa2xx_spi_h
 
+#include <linux/types.h>
+
 #include <linux/pxa2xx_ssp.h>
 
 #define PXA2XX_CS_ASSERT (0x01)
-- 
2.30.2


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[PATCH v1 05/14] spi: pxa2xx: Consolidate related headers under include/linux/spi

[Andy Shevchenko]

We have two headers split between include/linux and include/linux/spi.
Consolidated them under SPI realm, i.e. in the latter folder.

Update users accordingly.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/input/mouse/navpoint.c       | 3 ++-
 drivers/spi/spi-pxa2xx-dma.c         | 2 --
 drivers/spi/spi-pxa2xx-pci.c         | 1 +
 drivers/spi/spi-pxa2xx.h             | 2 +-
 include/linux/spi/pxa2xx_spi.h       | 9 +++++----
 include/linux/{ => spi}/pxa2xx_ssp.h | 6 +++---
 sound/soc/intel/catpt/dsp.c          | 4 +++-
 sound/soc/pxa/pxa-ssp.c              | 3 ++-
 8 files changed, 17 insertions(+), 13 deletions(-)
 rename include/linux/{ => spi}/pxa2xx_ssp.h (99%)

diff --git a/drivers/input/mouse/navpoint.c b/drivers/input/mouse/navpoint.c
index 4d67575bb276..a0731cfbbafa 100644
--- a/drivers/input/mouse/navpoint.c
+++ b/drivers/input/mouse/navpoint.c
@@ -15,9 +15,10 @@
 #include <linux/input/navpoint.h>
 #include <linux/interrupt.h>
 #include <linux/mutex.h>
-#include <linux/pxa2xx_ssp.h>
 #include <linux/slab.h>
 
+#include <linux/spi/pxa2xx_ssp.h>
+
 /*
  * Synaptics Modular Embedded Protocol: Module Packet Format.
  * Module header byte 2:0 = Length (# bytes that follow)
diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
index 32ab7391396d..e00dbadd39ec 100644
--- a/drivers/spi/spi-pxa2xx-dma.c
+++ b/drivers/spi/spi-pxa2xx-dma.c
@@ -15,8 +15,6 @@
 #include <linux/spi/pxa2xx_spi.h>
 #include <linux/spi/spi.h>
 
-#include <linux/pxa2xx_ssp.h>
-
 #include "spi-pxa2xx.h"
 
 static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data,
diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
index f60ed4c62000..5af0a3fbc1b0 100644
--- a/drivers/spi/spi-pxa2xx-pci.c
+++ b/drivers/spi/spi-pxa2xx-pci.c
@@ -8,6 +8,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
+
 #include <linux/spi/pxa2xx_spi.h>
 
 #include <linux/dmaengine.h>
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 739e264feaa6..b6dae0981b61 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -12,7 +12,7 @@
 #include <linux/types.h>
 #include <linux/sizes.h>
 
-#include <linux/pxa2xx_ssp.h>
+#include <linux/spi/pxa2xx_ssp.h>
 
 struct gpio_desc;
 struct pxa2xx_spi_controller;
diff --git a/include/linux/spi/pxa2xx_spi.h b/include/linux/spi/pxa2xx_spi.h
index 1e0e2f136319..4baae475bd89 100644
--- a/include/linux/spi/pxa2xx_spi.h
+++ b/include/linux/spi/pxa2xx_spi.h
@@ -2,12 +2,12 @@
 /*
  * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
  */
-#ifndef __linux_pxa2xx_spi_h
-#define __linux_pxa2xx_spi_h
+#ifndef __LINUX_PXA2XX_SPI_H
+#define __LINUX_PXA2XX_SPI_H
 
 #include <linux/types.h>
 
-#include <linux/pxa2xx_ssp.h>
+#include <linux/spi/pxa2xx_ssp.h>
 
 #define PXA2XX_CS_ASSERT (0x01)
 #define PXA2XX_CS_DEASSERT (0x02)
@@ -51,4 +51,5 @@ struct pxa2xx_spi_chip {
 extern void pxa2xx_set_spi_info(unsigned id, struct pxa2xx_spi_controller *info);
 
 #endif
-#endif
+
+#endif	/* __LINUX_PXA2XX_SPI_H */
diff --git a/include/linux/pxa2xx_ssp.h b/include/linux/spi/pxa2xx_ssp.h
similarity index 99%
rename from include/linux/pxa2xx_ssp.h
rename to include/linux/spi/pxa2xx_ssp.h
index 7f73b26ed22e..14b049840faf 100644
--- a/include/linux/pxa2xx_ssp.h
+++ b/include/linux/spi/pxa2xx_ssp.h
@@ -11,8 +11,8 @@
  *       PXA3xx     SSP1, SSP2, SSP3, SSP4
  */
 
-#ifndef __LINUX_SSP_H
-#define __LINUX_SSP_H
+#ifndef __LINUX_PXA2XX_SSP_H
+#define __LINUX_PXA2XX_SSP_H
 
 #include <linux/bits.h>
 #include <linux/compiler_types.h>
@@ -270,4 +270,4 @@ static inline struct ssp_device *pxa_ssp_request_of(const struct device_node *n,
 static inline void pxa_ssp_free(struct ssp_device *ssp) {}
 #endif
 
-#endif
+#endif	/* __LINUX_PXA2XX_SSP_H */
diff --git a/sound/soc/intel/catpt/dsp.c b/sound/soc/intel/catpt/dsp.c
index 9c5fd18f2600..08af8bab8704 100644
--- a/sound/soc/intel/catpt/dsp.c
+++ b/sound/soc/intel/catpt/dsp.c
@@ -9,7 +9,9 @@
 #include <linux/dma-mapping.h>
 #include <linux/firmware.h>
 #include <linux/pci.h>
-#include <linux/pxa2xx_ssp.h>
+
+#include <linux/spi/pxa2xx_ssp.h>
+
 #include "core.h"
 #include "messages.h"
 #include "registers.h"
diff --git a/sound/soc/pxa/pxa-ssp.c b/sound/soc/pxa/pxa-ssp.c
index b941adcbb8f9..710c8dbd18bc 100644
--- a/sound/soc/pxa/pxa-ssp.c
+++ b/sound/soc/pxa/pxa-ssp.c
@@ -16,10 +16,11 @@
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/pxa2xx_ssp.h>
 #include <linux/of.h>
 #include <linux/dmaengine.h>
 
+#include <linux/spi/pxa2xx_ssp.h>
+
 #include <asm/irq.h>
 
 #include <sound/core.h>
-- 
2.30.2


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Re: [PATCH v1 05/14] spi: pxa2xx: Consolidate related headers under include/linux/spi

[Mark Brown]

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On Fri, Apr 23, 2021 at 07:34:28PM +0300, Andy Shevchenko wrote:

> We have two headers split between include/linux and include/linux/spi.
> Consolidated them under SPI realm, i.e. in the latter folder.

Why?  Isn't the point to maintain an abstraction between the general
purpose use of the SSP IP and its application as a SPI controller?  I'd
check the cover letter for the series but there doesn't seem to be one.

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Re: [PATCH v1 05/14] spi: pxa2xx: Consolidate related headers under include/linux/spi

[Andy Shevchenko]

On Fri, Apr 23, 2021 at 05:56:30PM +0100, Mark Brown wrote:
> On Fri, Apr 23, 2021 at 07:34:28PM +0300, Andy Shevchenko wrote:
> 
> > We have two headers split between include/linux and include/linux/spi.
> > Consolidated them under SPI realm, i.e. in the latter folder.
> 
> Why?  Isn't the point to maintain an abstraction between the general
> purpose use of the SSP IP and its application as a SPI controller?

Aren't the General Purpose of the SSP IP is an SPI controller either way?
What you are talking about is probably GP SPI vs. private (dedicated) SPI.

But okay, I got the idea, I can drop this patch.

> I'd
> check the cover letter for the series but there doesn't seem to be one.

Set of cleanups here and there related to the SPI PXA2xx driver.
It's hard to add something else here.

-- 
With Best Regards,
Andy Shevchenko



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Re: [PATCH v1 05/14] spi: pxa2xx: Consolidate related headers under include/linux/spi

[Mark Brown]

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On Fri, Apr 23, 2021 at 08:30:08PM +0300, Andy Shevchenko wrote:
> On Fri, Apr 23, 2021 at 05:56:30PM +0100, Mark Brown wrote:
> > On Fri, Apr 23, 2021 at 07:34:28PM +0300, Andy Shevchenko wrote:

> > > We have two headers split between include/linux and include/linux/spi.
> > > Consolidated them under SPI realm, i.e. in the latter folder.

> > Why?  Isn't the point to maintain an abstraction between the general
> > purpose use of the SSP IP and its application as a SPI controller?

> Aren't the General Purpose of the SSP IP is an SPI controller either way?
> What you are talking about is probably GP SPI vs. private (dedicated) SPI.

SPI and any other serial protocols that happen to come up - these
generic serial IPs also often get used for audio for example.

> > I'd
> > check the cover letter for the series but there doesn't seem to be one.

> Set of cleanups here and there related to the SPI PXA2xx driver.
> It's hard to add something else here.

It doesn't need to be much more than what you just wrote.

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[PATCH v1 06/14] spi: pxa2xx: Group Intel Quark specific definitions

[Andy Shevchenko]

DDS_RATE is Intel Quark specific definition. Move it to the rest
Intel Quark related.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/linux/spi/pxa2xx_ssp.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/spi/pxa2xx_ssp.h b/include/linux/spi/pxa2xx_ssp.h
index 14b049840faf..1b6c1a0922bd 100644
--- a/include/linux/spi/pxa2xx_ssp.h
+++ b/include/linux/spi/pxa2xx_ssp.h
@@ -38,7 +38,6 @@ struct device_node;
 #define SSDR		(0x10)  /* SSP Data Write/Data Read Register */
 
 #define SSTO		(0x28)  /* SSP Time Out Register */
-#define DDS_RATE	(0x28)  /* SSP DDS Clock Rate Register (Intel Quark) */
 #define SSPSP		(0x2C)  /* SSP Programmable Serial Protocol */
 #define SSTSA		(0x30)  /* SSP Tx Timeslot Active */
 #define SSRSA		(0x34)  /* SSP Rx Timeslot Active */
@@ -105,6 +104,9 @@ struct device_node;
 #define CE4100_SSCR1_RFT	GENMASK(11, 10)	/* Receive FIFO Threshold (mask) */
 #define CE4100_SSCR1_RxTresh(x) (((x) - 1) << 10)	/* level [1..4] */
 
+/* Intel Quark X1000 */
+#define DDS_RATE		0x28		 /* SSP DDS Clock Rate Register */
+
 /* QUARK_X1000 SSCR0 bit definition */
 #define QUARK_X1000_SSCR0_DSS		GENMASK(4, 0)	/* Data Size Select (mask) */
 #define QUARK_X1000_SSCR0_DataSize(x)	((x) - 1)	/* Data Size Select [4..32] */
-- 
2.30.2


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[PATCH v1 07/14] spi: pxa2xx: Introduce int_stop_and_reset() helper

[Andy Shevchenko]

Currently we have three times the same few lines repeated in the code.
Deduplicate them by newly introduced int_stop_and_reset() helper.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 0296cbdee848..4dab47e18d10 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -620,13 +620,20 @@ static void reset_sccr1(struct driver_data *drv_data)
 	pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg);
 }
 
-static void int_error_stop(struct driver_data *drv_data, const char* msg)
+static void int_stop_and_reset(struct driver_data *drv_data)
 {
-	/* Stop and reset SSP */
+	/* Clear and disable interrupts */
 	write_SSSR_CS(drv_data, drv_data->clear_sr);
 	reset_sccr1(drv_data);
-	if (!pxa25x_ssp_comp(drv_data))
-		pxa2xx_spi_write(drv_data, SSTO, 0);
+	if (pxa25x_ssp_comp(drv_data))
+		return;
+
+	pxa2xx_spi_write(drv_data, SSTO, 0);
+}
+
+static void int_error_stop(struct driver_data *drv_data, const char *msg)
+{
+	int_stop_and_reset(drv_data);
 	pxa2xx_spi_flush(drv_data);
 	pxa2xx_spi_off(drv_data);
 
@@ -638,11 +645,7 @@ static void int_error_stop(struct driver_data *drv_data, const char* msg)
 
 static void int_transfer_complete(struct driver_data *drv_data)
 {
-	/* Clear and disable interrupts */
-	write_SSSR_CS(drv_data, drv_data->clear_sr);
-	reset_sccr1(drv_data);
-	if (!pxa25x_ssp_comp(drv_data))
-		pxa2xx_spi_write(drv_data, SSTO, 0);
+	int_stop_and_reset(drv_data);
 
 	spi_finalize_current_transfer(drv_data->controller);
 }
@@ -1151,11 +1154,7 @@ static int pxa2xx_spi_slave_abort(struct spi_controller *controller)
 {
 	struct driver_data *drv_data = spi_controller_get_devdata(controller);
 
-	/* Stop and reset SSP */
-	write_SSSR_CS(drv_data, drv_data->clear_sr);
-	reset_sccr1(drv_data);
-	if (!pxa25x_ssp_comp(drv_data))
-		pxa2xx_spi_write(drv_data, SSTO, 0);
+	int_stop_and_reset(drv_data);
 	pxa2xx_spi_flush(drv_data);
 	pxa2xx_spi_off(drv_data);
 
-- 
2.30.2


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[PATCH v1 08/14] spi: pxa2xx: Reuse int_error_stop() in pxa2xx_spi_slave_abort()

[Andy Shevchenko]

It appears that pxa2xx_spi_slave_abort()almost  repeats the functionality
of the int_error_stop(). Reuse int_error_stop() in pxa2xx_spi_slave_abort().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 4dab47e18d10..85a8d228a117 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -631,7 +631,7 @@ static void int_stop_and_reset(struct driver_data *drv_data)
 	pxa2xx_spi_write(drv_data, SSTO, 0);
 }
 
-static void int_error_stop(struct driver_data *drv_data, const char *msg)
+static void int_error_stop(struct driver_data *drv_data, const char *msg, int err)
 {
 	int_stop_and_reset(drv_data);
 	pxa2xx_spi_flush(drv_data);
@@ -639,7 +639,7 @@ static void int_error_stop(struct driver_data *drv_data, const char *msg)
 
 	dev_err(drv_data->ssp->dev, "%s\n", msg);
 
-	drv_data->controller->cur_msg->status = -EIO;
+	drv_data->controller->cur_msg->status = err;
 	spi_finalize_current_transfer(drv_data->controller);
 }
 
@@ -658,12 +658,12 @@ static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
 	u32 irq_status = pxa2xx_spi_read(drv_data, SSSR) & irq_mask;
 
 	if (irq_status & SSSR_ROR) {
-		int_error_stop(drv_data, "interrupt_transfer: fifo overrun");
+		int_error_stop(drv_data, "interrupt_transfer: fifo overrun", -EIO);
 		return IRQ_HANDLED;
 	}
 
 	if (irq_status & SSSR_TUR) {
-		int_error_stop(drv_data, "interrupt_transfer: fifo underrun");
+		int_error_stop(drv_data, "interrupt_transfer: fifo underrun", -EIO);
 		return IRQ_HANDLED;
 	}
 
@@ -1154,14 +1154,7 @@ static int pxa2xx_spi_slave_abort(struct spi_controller *controller)
 {
 	struct driver_data *drv_data = spi_controller_get_devdata(controller);
 
-	int_stop_and_reset(drv_data);
-	pxa2xx_spi_flush(drv_data);
-	pxa2xx_spi_off(drv_data);
-
-	dev_dbg(drv_data->ssp->dev, "transfer aborted\n");
-
-	drv_data->controller->cur_msg->status = -EINTR;
-	spi_finalize_current_transfer(drv_data->controller);
+	int_error_stop(drv_data, "transfer aborted", -EINTR);
 
 	return 0;
 }
-- 
2.30.2


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[PATCH v1 09/14] spi: pxa2xx: Use pxa_ssp_enable()/pxa_ssp_disable() in the driver

[Andy Shevchenko]

There are few places that repeat the logic of pxa_ssp_enable() and
pxa_ssp_disable(). Use them instead of open coded variants.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx-dma.c   |  4 +---
 drivers/spi/spi-pxa2xx.c       | 36 +++++++++++++++++-----------------
 include/linux/spi/pxa2xx_ssp.h | 16 +++++++++++++++
 sound/soc/pxa/pxa-ssp.c        | 16 ---------------
 4 files changed, 35 insertions(+), 37 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
index e00dbadd39ec..5ca01ad7f460 100644
--- a/drivers/spi/spi-pxa2xx-dma.c
+++ b/drivers/spi/spi-pxa2xx-dma.c
@@ -50,9 +50,7 @@ static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data,
 
 		if (error) {
 			/* In case we got an error we disable the SSP now */
-			pxa2xx_spi_write(drv_data, SSCR0,
-					 pxa2xx_spi_read(drv_data, SSCR0)
-					 & ~SSCR0_SSE);
+			pxa_ssp_disable(drv_data->ssp);
 			msg->status = -EIO;
 		}
 
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 85a8d228a117..f85c7439757c 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -286,13 +286,11 @@ static u32 pxa2xx_configure_sscr0(const struct driver_data *drv_data,
 	case QUARK_X1000_SSP:
 		return clk_div
 			| QUARK_X1000_SSCR0_Motorola
-			| QUARK_X1000_SSCR0_DataSize(bits > 32 ? 8 : bits)
-			| SSCR0_SSE;
+			| QUARK_X1000_SSCR0_DataSize(bits > 32 ? 8 : bits);
 	default:
 		return clk_div
 			| SSCR0_Motorola
 			| SSCR0_DataSize(bits > 16 ? bits - 16 : bits)
-			| SSCR0_SSE
 			| (bits > 16 ? SSCR0_EDSS : 0);
 	}
 }
@@ -498,8 +496,7 @@ static void pxa2xx_spi_off(struct driver_data *drv_data)
 	if (is_mmp2_ssp(drv_data))
 		return;
 
-	pxa2xx_spi_write(drv_data, SSCR0,
-			 pxa2xx_spi_read(drv_data, SSCR0) & ~SSCR0_SSE);
+	pxa_ssp_disable(drv_data->ssp);
 }
 
 static int null_writer(struct driver_data *drv_data)
@@ -1098,25 +1095,26 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *controller,
 	    (pxa2xx_spi_read(drv_data, DDS_RATE) != chip->dds_rate))
 		pxa2xx_spi_write(drv_data, DDS_RATE, chip->dds_rate);
 
+	/* Stop the SSP */
+	if (!is_mmp2_ssp(drv_data))
+		pxa_ssp_disable(drv_data->ssp);
+
+	if (!pxa25x_ssp_comp(drv_data))
+		pxa2xx_spi_write(drv_data, SSTO, chip->timeout);
+
 	/* see if we need to reload the config registers */
 	if ((pxa2xx_spi_read(drv_data, SSCR0) != cr0)
 	    || (pxa2xx_spi_read(drv_data, SSCR1) & change_mask)
 	    != (cr1 & change_mask)) {
-		/* stop the SSP, and update the other bits */
-		if (!is_mmp2_ssp(drv_data))
-			pxa2xx_spi_write(drv_data, SSCR0, cr0 & ~SSCR0_SSE);
-		if (!pxa25x_ssp_comp(drv_data))
-			pxa2xx_spi_write(drv_data, SSTO, chip->timeout);
 		/* first set CR1 without interrupt and service enables */
 		pxa2xx_spi_write(drv_data, SSCR1, cr1 & change_mask);
-		/* restart the SSP */
+		/* Update the other bits */
 		pxa2xx_spi_write(drv_data, SSCR0, cr0);
-
-	} else {
-		if (!pxa25x_ssp_comp(drv_data))
-			pxa2xx_spi_write(drv_data, SSTO, chip->timeout);
 	}
 
+	/* Restart the SSP */
+	pxa_ssp_enable(drv_data->ssp);
+
 	if (is_mmp2_ssp(drv_data)) {
 		u8 tx_level = (pxa2xx_spi_read(drv_data, SSSR)
 					& SSSR_TFL_MASK) >> 8;
@@ -1782,8 +1780,9 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
 		controller->min_speed_hz =
 			DIV_ROUND_UP(controller->max_speed_hz, 512);
 
+	pxa_ssp_disable(ssp);
+
 	/* Load default SSP configuration */
-	pxa2xx_spi_write(drv_data, SSCR0, 0);
 	switch (drv_data->ssp_type) {
 	case QUARK_X1000_SSP:
 		tmp = QUARK_X1000_SSCR1_RxTresh(RX_THRESH_QUARK_X1000_DFLT) |
@@ -1924,7 +1923,7 @@ static int pxa2xx_spi_remove(struct platform_device *pdev)
 	spi_unregister_controller(drv_data->controller);
 
 	/* Disable the SSP at the peripheral and SOC level */
-	pxa2xx_spi_write(drv_data, SSCR0, 0);
+	pxa_ssp_disable(ssp);
 	clk_disable_unprepare(ssp->clk);
 
 	/* Release DMA */
@@ -1953,7 +1952,8 @@ static int pxa2xx_spi_suspend(struct device *dev)
 	status = spi_controller_suspend(drv_data->controller);
 	if (status != 0)
 		return status;
-	pxa2xx_spi_write(drv_data, SSCR0, 0);
+
+	pxa_ssp_disable(ssp);
 
 	if (!pm_runtime_suspended(dev))
 		clk_disable_unprepare(ssp->clk);
diff --git a/include/linux/spi/pxa2xx_ssp.h b/include/linux/spi/pxa2xx_ssp.h
index 1b6c1a0922bd..fdfbe17e15f4 100644
--- a/include/linux/spi/pxa2xx_ssp.h
+++ b/include/linux/spi/pxa2xx_ssp.h
@@ -254,6 +254,22 @@ static inline u32 pxa_ssp_read_reg(struct ssp_device *dev, u32 reg)
 	return __raw_readl(dev->mmio_base + reg);
 }
 
+static inline void pxa_ssp_enable(struct ssp_device *ssp)
+{
+	u32 sscr0;
+
+	sscr0 = pxa_ssp_read_reg(ssp, SSCR0) | SSCR0_SSE;
+	pxa_ssp_write_reg(ssp, SSCR0, sscr0);
+}
+
+static inline void pxa_ssp_disable(struct ssp_device *ssp)
+{
+	u32 sscr0;
+
+	sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & ~SSCR0_SSE;
+	pxa_ssp_write_reg(ssp, SSCR0, sscr0);
+}
+
 #if IS_ENABLED(CONFIG_PXA_SSP)
 struct ssp_device *pxa_ssp_request(int port, const char *label);
 void pxa_ssp_free(struct ssp_device *);
diff --git a/sound/soc/pxa/pxa-ssp.c b/sound/soc/pxa/pxa-ssp.c
index 710c8dbd18bc..5a83331fc160 100644
--- a/sound/soc/pxa/pxa-ssp.c
+++ b/sound/soc/pxa/pxa-ssp.c
@@ -62,22 +62,6 @@ static void dump_registers(struct ssp_device *ssp)
 		 pxa_ssp_read_reg(ssp, SSACD));
 }
 
-static void pxa_ssp_enable(struct ssp_device *ssp)
-{
-	uint32_t sscr0;
-
-	sscr0 = __raw_readl(ssp->mmio_base + SSCR0) | SSCR0_SSE;
-	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
-}
-
-static void pxa_ssp_disable(struct ssp_device *ssp)
-{
-	uint32_t sscr0;
-
-	sscr0 = __raw_readl(ssp->mmio_base + SSCR0) & ~SSCR0_SSE;
-	__raw_writel(sscr0, ssp->mmio_base + SSCR0);
-}
-
 static void pxa_ssp_set_dma_params(struct ssp_device *ssp, int width4,
 			int out, struct snd_dmaengine_dai_dma_data *dma)
 {
-- 
2.30.2


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[PATCH v1 10/14] spi: pxa2xx: Extract pxa2xx_spi_update() helper

[Andy Shevchenko]

There are few places that repeat the logic of "update if changed".
Extract pxa2xx_spi_update() helper to deduplicate that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 33 ++++++++++++++-------------------
 1 file changed, 14 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index f85c7439757c..4b3237f14ead 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -200,6 +200,12 @@ static bool is_mmp2_ssp(const struct driver_data *drv_data)
 	return drv_data->ssp_type == MMP2_SSP;
 }
 
+static void pxa2xx_spi_update(const struct driver_data *drv_data, u32 reg, u32 mask, u32 value)
+{
+	if ((pxa2xx_spi_read(drv_data, reg) & mask) != value)
+		pxa2xx_spi_write(drv_data, reg, value & mask);
+}
+
 static u32 pxa2xx_spi_get_ssrc1_change_mask(const struct driver_data *drv_data)
 {
 	switch (drv_data->ssp_type) {
@@ -1081,19 +1087,12 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *controller,
 			dma_mapped ? "DMA" : "PIO");
 
 	if (is_lpss_ssp(drv_data)) {
-		if ((pxa2xx_spi_read(drv_data, SSIRF) & 0xff)
-		    != chip->lpss_rx_threshold)
-			pxa2xx_spi_write(drv_data, SSIRF,
-					 chip->lpss_rx_threshold);
-		if ((pxa2xx_spi_read(drv_data, SSITF) & 0xffff)
-		    != chip->lpss_tx_threshold)
-			pxa2xx_spi_write(drv_data, SSITF,
-					 chip->lpss_tx_threshold);
+		pxa2xx_spi_update(drv_data, SSIRF, GENMASK(7, 0), chip->lpss_rx_threshold);
+		pxa2xx_spi_update(drv_data, SSITF, GENMASK(15, 0), chip->lpss_tx_threshold);
 	}
 
-	if (is_quark_x1000_ssp(drv_data) &&
-	    (pxa2xx_spi_read(drv_data, DDS_RATE) != chip->dds_rate))
-		pxa2xx_spi_write(drv_data, DDS_RATE, chip->dds_rate);
+	if (is_quark_x1000_ssp(drv_data))
+		pxa2xx_spi_update(drv_data, DDS_RATE, GENMASK(23, 0), chip->dds_rate);
 
 	/* Stop the SSP */
 	if (!is_mmp2_ssp(drv_data))
@@ -1102,15 +1101,11 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *controller,
 	if (!pxa25x_ssp_comp(drv_data))
 		pxa2xx_spi_write(drv_data, SSTO, chip->timeout);
 
+	/* first set CR1 without interrupt and service enables */
+	pxa2xx_spi_update(drv_data, SSCR1, change_mask, cr1);
+
 	/* see if we need to reload the config registers */
-	if ((pxa2xx_spi_read(drv_data, SSCR0) != cr0)
-	    || (pxa2xx_spi_read(drv_data, SSCR1) & change_mask)
-	    != (cr1 & change_mask)) {
-		/* first set CR1 without interrupt and service enables */
-		pxa2xx_spi_write(drv_data, SSCR1, cr1 & change_mask);
-		/* Update the other bits */
-		pxa2xx_spi_write(drv_data, SSCR0, cr0);
-	}
+	pxa2xx_spi_update(drv_data, SSCR0, GENMASK(31, 0), cr0);
 
 	/* Restart the SSP */
 	pxa_ssp_enable(drv_data->ssp);
-- 
2.30.2


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[PATCH v1 11/14] spi: pxa2xx: Extract clear_SSCR1_bits() helper

[Andy Shevchenko]

There are few places that repeat the logic of "clear some bits in SSCR1".
Extract clear_SSCR1_bits() helper to deduplicate that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx-dma.c | 4 +---
 drivers/spi/spi-pxa2xx.c     | 7 ++-----
 drivers/spi/spi-pxa2xx.h     | 5 +++++
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
index 5ca01ad7f460..e581027e99f9 100644
--- a/drivers/spi/spi-pxa2xx-dma.c
+++ b/drivers/spi/spi-pxa2xx-dma.c
@@ -41,9 +41,7 @@ static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data,
 		}
 
 		/* Clear status & disable interrupts */
-		pxa2xx_spi_write(drv_data, SSCR1,
-				 pxa2xx_spi_read(drv_data, SSCR1)
-				 & ~drv_data->dma_cr1);
+		clear_SSCR1_bits(drv_data, drv_data->dma_cr1);
 		write_SSSR_CS(drv_data, drv_data->clear_sr);
 		if (!pxa25x_ssp_comp(drv_data))
 			pxa2xx_spi_write(drv_data, SSTO, 0);
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 4b3237f14ead..58178ba704dc 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -733,8 +733,7 @@ static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
 static void handle_bad_msg(struct driver_data *drv_data)
 {
 	pxa2xx_spi_off(drv_data);
-	pxa2xx_spi_write(drv_data, SSCR1,
-			 pxa2xx_spi_read(drv_data, SSCR1) & ~drv_data->int_cr1);
+	clear_SSCR1_bits(drv_data, drv_data->int_cr1);
 	if (!pxa25x_ssp_comp(drv_data))
 		pxa2xx_spi_write(drv_data, SSTO, 0);
 	write_SSSR_CS(drv_data, drv_data->clear_sr);
@@ -1161,9 +1160,7 @@ static void pxa2xx_spi_handle_err(struct spi_controller *controller,
 	pxa2xx_spi_off(drv_data);
 	/* Clear and disable interrupts and service requests */
 	write_SSSR_CS(drv_data, drv_data->clear_sr);
-	pxa2xx_spi_write(drv_data, SSCR1,
-			 pxa2xx_spi_read(drv_data, SSCR1)
-			 & ~(drv_data->int_cr1 | drv_data->dma_cr1));
+	clear_SSCR1_bits(drv_data, drv_data->int_cr1 | drv_data->dma_cr1);
 	if (!pxa25x_ssp_comp(drv_data))
 		pxa2xx_spi_write(drv_data, SSTO, 0);
 
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index b6dae0981b61..398dbd680208 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -105,6 +105,11 @@ static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
 	}
 }
 
+static inline void clear_SSCR1_bits(const struct driver_data *drv_data, u32 bits)
+{
+	pxa2xx_spi_write(drv_data, SSCR1, pxa2xx_spi_read(drv_data, SSCR1) & ~bits);
+}
+
 static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
 {
 	if (drv_data->ssp_type == CE4100_SSP ||
-- 
2.30.2


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[PATCH v1 12/14] spi: pxa2xx: Extract read_SSSR_bits() helper

[Andy Shevchenko]

There are few places that repeat the logic of "read some bits from SSSR".
Extract read_SSSR_bits() helper to deduplicate that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx-dma.c |  9 +++------
 drivers/spi/spi-pxa2xx.c     | 26 +++++++++++---------------
 drivers/spi/spi-pxa2xx.h     |  7 ++++++-
 3 files changed, 20 insertions(+), 22 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
index e581027e99f9..f022d82dcb1b 100644
--- a/drivers/spi/spi-pxa2xx-dma.c
+++ b/drivers/spi/spi-pxa2xx-dma.c
@@ -34,11 +34,8 @@ static void pxa2xx_spi_dma_transfer_complete(struct driver_data *drv_data,
 		 * might not know about the error yet. So we re-check the
 		 * ROR bit here before we clear the status register.
 		 */
-		if (!error) {
-			u32 status = pxa2xx_spi_read(drv_data, SSSR)
-				     & drv_data->mask_sr;
-			error = status & SSSR_ROR;
-		}
+		if (!error)
+			error = read_SSSR_bits(drv_data, drv_data->mask_sr) & SSSR_ROR;
 
 		/* Clear status & disable interrupts */
 		clear_SSCR1_bits(drv_data, drv_data->dma_cr1);
@@ -119,7 +116,7 @@ irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data)
 {
 	u32 status;
 
-	status = pxa2xx_spi_read(drv_data, SSSR) & drv_data->mask_sr;
+	status = read_SSSR_bits(drv_data, drv_data->mask_sr);
 	if (status & SSSR_ROR) {
 		dev_err(drv_data->ssp->dev, "FIFO overrun\n");
 
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 58178ba704dc..5a4f808eefde 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -247,7 +247,7 @@ static bool pxa2xx_spi_txfifo_full(const struct driver_data *drv_data)
 		break;
 	}
 
-	return (pxa2xx_spi_read(drv_data, SSSR) & mask) == mask;
+	return read_SSSR_bits(drv_data, mask) == mask;
 }
 
 static void pxa2xx_spi_clear_rx_thre(const struct driver_data *drv_data,
@@ -488,7 +488,7 @@ int pxa2xx_spi_flush(struct driver_data *drv_data)
 	unsigned long limit = loops_per_jiffy << 1;
 
 	do {
-		while (pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
+		while (read_SSSR_bits(drv_data, SSSR_RNE))
 			pxa2xx_spi_read(drv_data, SSDR);
 	} while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_BSY) && --limit);
 	write_SSSR_CS(drv_data, SSSR_ROR);
@@ -523,8 +523,7 @@ static int null_reader(struct driver_data *drv_data)
 {
 	u8 n_bytes = drv_data->n_bytes;
 
-	while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
-	       && (drv_data->rx < drv_data->rx_end)) {
+	while (read_SSSR_bits(drv_data, SSSR_RNE) && drv_data->rx < drv_data->rx_end) {
 		pxa2xx_spi_read(drv_data, SSDR);
 		drv_data->rx += n_bytes;
 	}
@@ -546,8 +545,7 @@ static int u8_writer(struct driver_data *drv_data)
 
 static int u8_reader(struct driver_data *drv_data)
 {
-	while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
-	       && (drv_data->rx < drv_data->rx_end)) {
+	while (read_SSSR_bits(drv_data, SSSR_RNE) && drv_data->rx < drv_data->rx_end) {
 		*(u8 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR);
 		++drv_data->rx;
 	}
@@ -569,8 +567,7 @@ static int u16_writer(struct driver_data *drv_data)
 
 static int u16_reader(struct driver_data *drv_data)
 {
-	while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
-	       && (drv_data->rx < drv_data->rx_end)) {
+	while (read_SSSR_bits(drv_data, SSSR_RNE) && drv_data->rx < drv_data->rx_end) {
 		*(u16 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR);
 		drv_data->rx += 2;
 	}
@@ -592,8 +589,7 @@ static int u32_writer(struct driver_data *drv_data)
 
 static int u32_reader(struct driver_data *drv_data)
 {
-	while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
-	       && (drv_data->rx < drv_data->rx_end)) {
+	while (read_SSSR_bits(drv_data, SSSR_RNE) && drv_data->rx < drv_data->rx_end) {
 		*(u32 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR);
 		drv_data->rx += 4;
 	}
@@ -655,10 +651,11 @@ static void int_transfer_complete(struct driver_data *drv_data)
 
 static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
 {
-	u32 irq_mask = (pxa2xx_spi_read(drv_data, SSCR1) & SSCR1_TIE) ?
-		       drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS;
+	u32 irq_status;
 
-	u32 irq_status = pxa2xx_spi_read(drv_data, SSSR) & irq_mask;
+	irq_status = read_SSSR_bits(drv_data, drv_data->mask_sr);
+	if (!(pxa2xx_spi_read(drv_data, SSCR1) & SSCR1_TIE))
+		irq_status &= ~SSSR_TFS;
 
 	if (irq_status & SSSR_ROR) {
 		int_error_stop(drv_data, "interrupt_transfer: fifo overrun", -EIO);
@@ -1110,8 +1107,7 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *controller,
 	pxa_ssp_enable(drv_data->ssp);
 
 	if (is_mmp2_ssp(drv_data)) {
-		u8 tx_level = (pxa2xx_spi_read(drv_data, SSSR)
-					& SSSR_TFL_MASK) >> 8;
+		u8 tx_level = read_SSSR_bits(drv_data, SSSR_TFL_MASK) >> 8;
 
 		if (tx_level) {
 			/* On MMP2, flipping SSE doesn't to empty TXFIFO. */
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 398dbd680208..6d4273772b1f 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -110,11 +110,16 @@ static inline void clear_SSCR1_bits(const struct driver_data *drv_data, u32 bits
 	pxa2xx_spi_write(drv_data, SSCR1, pxa2xx_spi_read(drv_data, SSCR1) & ~bits);
 }
 
+static inline u32 read_SSSR_bits(const struct driver_data *drv_data, u32 bits)
+{
+	return pxa2xx_spi_read(drv_data, SSSR) & bits;
+}
+
 static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
 {
 	if (drv_data->ssp_type == CE4100_SSP ||
 	    drv_data->ssp_type == QUARK_X1000_SSP)
-		val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK;
+		val |= read_SSSR_bits(drv_data, SSSR_ALT_FRM_MASK);
 
 	pxa2xx_spi_write(drv_data, SSSR, val);
 }
-- 
2.30.2


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[PATCH v1 13/14] spi: pxa2xx: Constify struct driver_data parameter

[Andy Shevchenko]

In a couple of functions the contents of struct driver_data are not altered,
hence we may constify the respective function parameter.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 6d4273772b1f..301969fc3c95 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -93,7 +93,7 @@ static inline void pxa2xx_spi_write(const struct driver_data *drv_data, u32 reg,
 
 #define DMA_ALIGNMENT		8
 
-static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
+static inline int pxa25x_ssp_comp(const struct driver_data *drv_data)
 {
 	switch (drv_data->ssp_type) {
 	case PXA25x_SSP:
@@ -115,7 +115,7 @@ static inline u32 read_SSSR_bits(const struct driver_data *drv_data, u32 bits)
 	return pxa2xx_spi_read(drv_data, SSSR) & bits;
 }
 
-static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
+static inline void write_SSSR_CS(const struct driver_data *drv_data, u32 val)
 {
 	if (drv_data->ssp_type == CE4100_SSP ||
 	    drv_data->ssp_type == QUARK_X1000_SSP)
-- 
2.30.2


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[PATCH v1 14/14] spi: pxa2xx: Introduce special type for Merrifield SPIs

[Andy Shevchenko]

Intel Merrifield SPI is actually more closer to PXA3xx. It has extended FIFO
(32 bytes) and additional registers to get or set FIFO thresholds.

Introduce new type for Intel Merrifield SPI host controllers and handle bigger
FIFO size.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx-pci.c   |  2 +-
 drivers/spi/spi-pxa2xx.c       | 32 +++++++++++++++++++++++++++++---
 include/linux/spi/pxa2xx_ssp.h | 16 ++++++++++++++++
 3 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
index 5af0a3fbc1b0..5df6e11b345d 100644
--- a/drivers/spi/spi-pxa2xx-pci.c
+++ b/drivers/spi/spi-pxa2xx-pci.c
@@ -179,7 +179,7 @@ static struct pxa_spi_info spi_info_configs[] = {
 		.rx_param = &bsw2_rx_param,
 	},
 	[PORT_MRFLD] = {
-		.type = PXA27x_SSP,
+		.type = MRFLD_SSP,
 		.max_clk_rate = 25000000,
 		.setup = mrfld_spi_setup,
 	},
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 5a4f808eefde..313095bfa7dd 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -200,6 +200,11 @@ static bool is_mmp2_ssp(const struct driver_data *drv_data)
 	return drv_data->ssp_type == MMP2_SSP;
 }
 
+static bool is_mrfld_ssp(const struct driver_data *drv_data)
+{
+	return drv_data->ssp_type == MRFLD_SSP;
+}
+
 static void pxa2xx_spi_update(const struct driver_data *drv_data, u32 reg, u32 mask, u32 value)
 {
 	if ((pxa2xx_spi_read(drv_data, reg) & mask) != value)
@@ -1087,6 +1092,15 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *controller,
 		pxa2xx_spi_update(drv_data, SSITF, GENMASK(15, 0), chip->lpss_tx_threshold);
 	}
 
+	if (is_mrfld_ssp(drv_data)) {
+		u32 thresh = 0;
+
+		thresh |= SFIFOTT_RxThresh(chip->lpss_rx_threshold);
+		thresh |= SFIFOTT_TxThresh(chip->lpss_tx_threshold);
+
+		pxa2xx_spi_update(drv_data, SFIFOTT, 0xffffffff, thresh);
+	}
+
 	if (is_quark_x1000_ssp(drv_data))
 		pxa2xx_spi_update(drv_data, DDS_RATE, GENMASK(23, 0), chip->dds_rate);
 
@@ -1253,6 +1267,11 @@ static int setup(struct spi_device *spi)
 		tx_hi_thres = 0;
 		rx_thres = RX_THRESH_QUARK_X1000_DFLT;
 		break;
+	case MRFLD_SSP:
+		tx_thres = TX_THRESH_MRFLD_DFLT;
+		tx_hi_thres = 0;
+		rx_thres = RX_THRESH_MRFLD_DFLT;
+		break;
 	case CE4100_SSP:
 		tx_thres = TX_THRESH_CE4100_DFLT;
 		tx_hi_thres = 0;
@@ -1328,9 +1347,16 @@ static int setup(struct spi_device *spi)
 		chip->cr1 |= SSCR1_SPH;
 	}
 
-	chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres);
-	chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres)
-				| SSITF_TxHiThresh(tx_hi_thres);
+	if (is_lpss_ssp(drv_data)) {
+		chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres);
+		chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres) |
+					  SSITF_TxHiThresh(tx_hi_thres);
+	}
+
+	if (is_mrfld_ssp(drv_data)) {
+		chip->lpss_rx_threshold = rx_thres;
+		chip->lpss_tx_threshold = tx_thres;
+	}
 
 	/* set dma burst and threshold outside of chip_info path so that if
 	 * chip_info goes away after setting chip->enable_dma, the
diff --git a/include/linux/spi/pxa2xx_ssp.h b/include/linux/spi/pxa2xx_ssp.h
index fdfbe17e15f4..2b21bc1f3c73 100644
--- a/include/linux/spi/pxa2xx_ssp.h
+++ b/include/linux/spi/pxa2xx_ssp.h
@@ -183,6 +183,21 @@ struct device_node;
 #define SSACD_ACPS(x)		((x) << 4)	/* Audio clock PLL select */
 #define SSACD_SCDX8		BIT(7)		/* SYSCLK division ratio select */
 
+/* Intel Merrifield SSP */
+#define SFIFOL			0x68		/* FIFO level */
+#define SFIFOTT			0x6c		/* FIFO trigger threshold */
+
+#define RX_THRESH_MRFLD_DFLT	16
+#define TX_THRESH_MRFLD_DFLT	16
+
+#define SFIFOL_TFL_MASK		GENMASK(15, 0)	/* Transmit FIFO Level mask */
+#define SFIFOL_RFL_MASK		GENMASK(31, 16)	/* Receive FIFO Level mask */
+
+#define SFIFOTT_TFT		GENMASK(15, 0)	/* Transmit FIFO Threshold (mask) */
+#define SFIFOTT_TxThresh(x)	(((x) - 1) << 0)	/* TX FIFO trigger threshold / level */
+#define SFIFOTT_RFT		GENMASK(31, 16)	/* Receive FIFO Threshold (mask) */
+#define SFIFOTT_RxThresh(x)	(((x) - 1) << 16)	/* RX FIFO trigger threshold / level */
+
 /* LPSS SSP */
 #define SSITF			0x44		/* TX FIFO trigger level */
 #define SSITF_TxHiThresh(x)	(((x) - 1) << 0)
@@ -205,6 +220,7 @@ enum pxa_ssp_type {
 	MMP2_SSP,
 	PXA910_SSP,
 	CE4100_SSP,
+	MRFLD_SSP,
 	QUARK_X1000_SSP,
 	LPSS_LPT_SSP, /* Keep LPSS types sorted with lpss_platforms[] */
 	LPSS_BYT_SSP,
-- 
2.30.2


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