[PATCH v10 0/3] Microchip Polarfire FPGA manager

[PATCH v10 0/3] Microchip Polarfire FPGA manager

[Ivan Bornyakov]

Add support to the FPGA manager for programming Microchip Polarfire
FPGAs over slave SPI interface with .dat formatted bitsream image.

Changelog:
  v1 -> v2: fix printk formating
  v2 -> v3:
   * replace "microsemi" with "microchip"
   * replace prefix "microsemi_fpga_" with "mpf_"
   * more sensible .compatible and .name strings
   * remove unused defines STATUS_SPI_VIOLATION and STATUS_SPI_ERROR
  v3 -> v4: fix unused variable warning
    Put 'mpf_of_ids' definition under conditional compilation, so it
    would not hang unused if CONFIG_OF is not enabled.
  v4 -> v5:
   * prefix defines with MPF_
   * mdelay() -> usleep_range()
   * formatting fixes
   * add DT bindings doc
   * rework fpga_manager_ops.write() to fpga_manager_ops.write_sg()
     We can't parse image header in write_init() because image header
     size is not known beforehand. Thus parsing need to be done in
     fpga_manager_ops.write() callback, but fpga_manager_ops.write()
     also need to be reenterable. On the other hand,
     fpga_manager_ops.write_sg() is called once. Thus, rework usage of
     write() callback to write_sg().
  v5 -> v6: fix patch applying
     I forgot to clean up unrelated local changes which lead to error on
     patch 0001-fpga-microchip-spi-add-Microchip-MPF-FPGA-manager.patch
     applying on vanilla kernel.
  v6 -> v7: fix binding doc to pass dt_binding_check
  v7 -> v8: another fix for dt_binding_check warning
  v8 -> v9:
   * add another patch to support bitstream offset in FPGA image buffer
   * rework fpga_manager_ops.write_sg() back to fpga_manager_ops.write()
   * move image header parsing from write() to write_init()
  v9 -> v10:
   * add parse_header() callback to fpga_manager_ops
   * adjust fpga_mgr_write_init[_buf|_sg]() for parse_header() usage
   * implement parse_header() in microchip-spi driver


Ivan Bornyakov (3):
  fpga: fpga-mgr: support bitstream offset in image buffer
  fpga: microchip-spi: add Microchip MPF FPGA manager
  dt-bindings: fpga: add binding doc for microchip-spi fpga mgr

 .../fpga/microchip,mpf-spi-fpga-mgr.yaml      |  44 +++
 drivers/fpga/Kconfig                          |   9 +
 drivers/fpga/Makefile                         |   1 +
 drivers/fpga/fpga-mgr.c                       | 151 +++++--
 drivers/fpga/microchip-spi.c                  | 369 ++++++++++++++++++
 include/linux/fpga/fpga-mgr.h                 |  13 +-
 6 files changed, 551 insertions(+), 36 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/fpga/microchip,mpf-spi-fpga-mgr.yaml
 create mode 100644 drivers/fpga/microchip-spi.c

-- 
2.35.1

[PATCH v10 1/3] fpga: fpga-mgr: support bitstream offset in image buffer

[Ivan Bornyakov]

At the moment FPGA manager core loads to the device entire image
provided to fpga_mgr_load(). But it is not always whole FPGA image
buffer meant to be written to the device. In particular, .dat formatted
image for Microchip MPF contains meta info in the header that is not
meant to be written to the device. This is issue for those low level
drivers that loads data to the device with write() fpga_manager_ops
callback, since write() can be called in iterator over scatter-gather
table, not only linear image buffer. On the other hand, write_sg()
callback is provided with whole image in scatter-gather form and can
decide itself which part should be sent to the device.

Add header_size and data_size to the fpga_image_info struct and adjust
fpga_mgr_write() callers with respect to them.

  * info->header_size indicates part at the beginning of image buffer
    that is *not* meant to be written to the device. It is optional and
    can be 0.

  * info->data_size is the size of actual bitstream data that *is* meant
    to be written to the device, starting at info->header_size from the
    beginning of image buffer. It is also optional and can be 0, which
    means bitstream data is up to the end of image buffer.

Also add parse_header() callback to fpga_manager_ops, which purpose is
to set info->header_size and info->data_size. At least
initial_header_size bytes of image buffer will be passed into
parse_header() first time. If it is not enough, parse_header() should
set desired size into info->header_size and return -EAGAIN, than it will
be called again with greater part of image buffer on the input.

Signed-off-by: Ivan Bornyakov <i.bornyakov@metrotek.ru>
---
 drivers/fpga/fpga-mgr.c       | 151 ++++++++++++++++++++++++++--------
 include/linux/fpga/fpga-mgr.h |  13 ++-
 2 files changed, 128 insertions(+), 36 deletions(-)

diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index 6bd018f20793..c6ca395909a0 100644
--- a/drivers/fpga/fpga-mgr.c
+++ b/drivers/fpga/fpga-mgr.c
@@ -74,6 +74,15 @@ static inline int fpga_mgr_write_complete(struct fpga_manager *mgr,
 	return 0;
 }
 
+static inline int fpga_mgr_parse_header(struct fpga_manager *mgr,
+					struct fpga_image_info *info,
+					const char *buf, size_t count)
+{
+	if (buf && mgr->mops->parse_header)
+		return mgr->mops->parse_header(mgr, info, buf, count);
+	return 0;
+}
+
 static inline int fpga_mgr_write_init(struct fpga_manager *mgr,
 				      struct fpga_image_info *info,
 				      const char *buf, size_t count)
@@ -136,31 +145,61 @@ void fpga_image_info_free(struct fpga_image_info *info)
 EXPORT_SYMBOL_GPL(fpga_image_info_free);
 
 /*
- * Call the low level driver's write_init function.  This will do the
- * device-specific things to get the FPGA into the state where it is ready to
- * receive an FPGA image. The low level driver only gets to see the first
- * initial_header_size bytes in the buffer.
+ * Call the low level driver's parse_header then write_init functions.
+ * This will do the device-specific things to get the FPGA into the state
+ * where it is ready to receive an FPGA image. If parse_header sets
+ * info->header_size, the low level driver's write_init only gets to see the
+ * first info->header_size bytes in the buffer, mgr->mops->initial_header_size
+ * otherwise. If neither initial_header_size nor header_size are not set,
+ * write_init will not get any bytes of image buffer.
  */
 static int fpga_mgr_write_init_buf(struct fpga_manager *mgr,
 				   struct fpga_image_info *info,
 				   const char *buf, size_t count)
 {
+	size_t header_size;
 	int ret;
 
 	mgr->state = FPGA_MGR_STATE_WRITE_INIT;
-	count = min(mgr->mops->initial_header_size, count);
-	if (!mgr->mops->initial_header_size)
-		ret = fpga_mgr_write_init(mgr, info, NULL, 0);
-	else
-		ret = fpga_mgr_write_init(mgr, info, buf, count);
+	ret = fpga_mgr_parse_header(mgr, info, buf, count);
+	if (ret) {
+		if (ret != -EAGAIN)
+			dev_err(&mgr->dev,
+				"Error while parsing FPGA image header\n");
 
+		mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
+		return ret;
+	}
+
+	header_size = mgr->mops->initial_header_size;
+	if (info->header_size)
+		header_size = info->header_size;
+
+	ret = fpga_mgr_write_init(mgr, info, header_size ? buf : NULL, header_size);
 	if (ret) {
 		dev_err(&mgr->dev, "Error preparing FPGA for writing\n");
 		mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
-		return ret;
 	}
 
-	return 0;
+	return ret;
+}
+
+static void *fpga_mgr_sgt_bounce_buf(struct sg_table *sgt, size_t count)
+{
+	size_t len;
+	void *buf;
+
+	buf = kmalloc(count, GFP_KERNEL);
+	if (!buf)
+		return ERR_PTR(-ENOMEM);
+
+	len = sg_copy_to_buffer(sgt->sgl, sgt->nents, buf, count);
+	if (len != count) {
+		kfree(buf);
+		return ERR_PTR(-EFAULT);
+	}
+
+	return buf;
 }
 
 static int fpga_mgr_write_init_sg(struct fpga_manager *mgr,
@@ -168,37 +207,46 @@ static int fpga_mgr_write_init_sg(struct fpga_manager *mgr,
 				  struct sg_table *sgt)
 {
 	struct sg_mapping_iter miter;
-	size_t len;
+	size_t header_size;
 	char *buf;
-	int ret;
+	int ret = -EAGAIN;
 
-	if (!mgr->mops->initial_header_size)
+	header_size = mgr->mops->initial_header_size;
+	if (!header_size)
 		return fpga_mgr_write_init_buf(mgr, info, NULL, 0);
 
-	/*
-	 * First try to use miter to map the first fragment to access the
-	 * header, this is the typical path.
-	 */
 	sg_miter_start(&miter, sgt->sgl, sgt->nents, SG_MITER_FROM_SG);
-	if (sg_miter_next(&miter) &&
-	    miter.length >= mgr->mops->initial_header_size) {
-		ret = fpga_mgr_write_init_buf(mgr, info, miter.addr,
-					      miter.length);
-		sg_miter_stop(&miter);
-		return ret;
+	if (!sg_miter_next(&miter)) {
+		mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
+		ret = -EFAULT;
 	}
-	sg_miter_stop(&miter);
 
-	/* Otherwise copy the fragments into temporary memory. */
-	buf = kmalloc(mgr->mops->initial_header_size, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
+	while (ret == -EAGAIN) {
+		/*
+		 * First try to use miter to map the first fragment to access
+		 * the header, this is the typical path.
+		 */
+		if (miter.length >= header_size) {
+			ret = fpga_mgr_write_init_buf(mgr, info, miter.addr,
+						      miter.length);
+		} else {
+			/*
+			 * Otherwise copy the fragments into temporary memory.
+			 */
+			buf = fpga_mgr_sgt_bounce_buf(sgt, header_size);
+			if (IS_ERR(buf)) {
+				mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
+				ret = PTR_ERR(buf);
+				break;
+			}
 
-	len = sg_copy_to_buffer(sgt->sgl, sgt->nents, buf,
-				mgr->mops->initial_header_size);
-	ret = fpga_mgr_write_init_buf(mgr, info, buf, len);
+			ret = fpga_mgr_write_init_buf(mgr, info, buf, header_size);
+			kfree(buf);
+		}
 
-	kfree(buf);
+		header_size = info->header_size;
+	}
+	sg_miter_stop(&miter);
 
 	return ret;
 }
@@ -235,13 +283,33 @@ static int fpga_mgr_buf_load_sg(struct fpga_manager *mgr,
 	if (mgr->mops->write_sg) {
 		ret = fpga_mgr_write_sg(mgr, sgt);
 	} else {
+		size_t offset, count, length, data_size;
 		struct sg_mapping_iter miter;
 
+		offset = info->header_size;
+		data_size = info->data_size;
+		count = 0;
+
 		sg_miter_start(&miter, sgt->sgl, sgt->nents, SG_MITER_FROM_SG);
 		while (sg_miter_next(&miter)) {
-			ret = fpga_mgr_write(mgr, miter.addr, miter.length);
-			if (ret)
+			if (offset >= miter.length) {
+				offset -= miter.length;
+				continue;
+			}
+
+			if (data_size)
+				length = min(miter.length - offset,
+					     data_size - count);
+			else
+				length = miter.length - offset;
+
+			count += length;
+
+			ret = fpga_mgr_write(mgr, miter.addr + offset, length);
+			if (ret || count == data_size)
 				break;
+
+			offset = 0;
 		}
 		sg_miter_stop(&miter);
 	}
@@ -265,6 +333,19 @@ static int fpga_mgr_buf_load_mapped(struct fpga_manager *mgr,
 	if (ret)
 		return ret;
 
+	if (info->header_size + info->data_size > count) {
+		dev_err(&mgr->dev, "Bitsream data outruns FPGA image\n");
+		mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
+		return -EINVAL;
+	}
+
+	if (info->data_size)
+		count = info->data_size;
+	else
+		count -= info->header_size;
+
+	buf += info->header_size;
+
 	/*
 	 * Write the FPGA image to the FPGA.
 	 */
diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
index 0f9468771bb9..a49b97bccfa2 100644
--- a/include/linux/fpga/fpga-mgr.h
+++ b/include/linux/fpga/fpga-mgr.h
@@ -85,6 +85,8 @@ enum fpga_mgr_states {
  * @sgt: scatter/gather table containing FPGA image
  * @buf: contiguous buffer containing FPGA image
  * @count: size of buf
+ * @header_size: offset in image buffer where bitstream data starts
+ * @data_size: size of bitstream. If 0, (count - header_size) will be used.
  * @region_id: id of target region
  * @dev: device that owns this
  * @overlay: Device Tree overlay
@@ -98,6 +100,8 @@ struct fpga_image_info {
 	struct sg_table *sgt;
 	const char *buf;
 	size_t count;
+	size_t header_size;
+	size_t data_size;
 	int region_id;
 	struct device *dev;
 #ifdef CONFIG_OF
@@ -137,9 +141,13 @@ struct fpga_manager_info {
 
 /**
  * struct fpga_manager_ops - ops for low level fpga manager drivers
- * @initial_header_size: Maximum number of bytes that should be passed into write_init
+ * @initial_header_size: minimum number of bytes that should be passed into
+ *	parse_header and write_init.
  * @state: returns an enum value of the FPGA's state
  * @status: returns status of the FPGA, including reconfiguration error code
+ * @parse_header: parse FPGA image header to set info->header_size and
+ *	info->data_size. In case the input buffer is not large enough, set
+ *	requierd size to info->header_size and return -EAGAIN.
  * @write_init: prepare the FPGA to receive configuration data
  * @write: write count bytes of configuration data to the FPGA
  * @write_sg: write the scatter list of configuration data to the FPGA
@@ -155,6 +163,9 @@ struct fpga_manager_ops {
 	size_t initial_header_size;
 	enum fpga_mgr_states (*state)(struct fpga_manager *mgr);
 	u64 (*status)(struct fpga_manager *mgr);
+	int (*parse_header)(struct fpga_manager *mgr,
+			    struct fpga_image_info *info,
+			    const char *buf, size_t count);
 	int (*write_init)(struct fpga_manager *mgr,
 			  struct fpga_image_info *info,
 			  const char *buf, size_t count);
-- 
2.35.1

[PATCH v10 2/3] fpga: microchip-spi: add Microchip MPF FPGA manager

[Ivan Bornyakov]

Add support to the FPGA manager for programming Microchip Polarfire
FPGAs over slave SPI interface with .dat formatted bitsream image.

Signed-off-by: Ivan Bornyakov <i.bornyakov@metrotek.ru>
---
 drivers/fpga/Kconfig         |   9 +
 drivers/fpga/Makefile        |   1 +
 drivers/fpga/microchip-spi.c | 369 +++++++++++++++++++++++++++++++++++
 3 files changed, 379 insertions(+)
 create mode 100644 drivers/fpga/microchip-spi.c

diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index 26025dbab353..75806ef5c9ea 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -248,4 +248,13 @@ config FPGA_MGR_VERSAL_FPGA
 	  configure the programmable logic(PL).
 
 	  To compile this as a module, choose M here.
+
+config FPGA_MGR_MICROCHIP_SPI
+	tristate "Microchip Polarfire SPI FPGA manager"
+	depends on SPI
+	help
+	  FPGA manager driver support for Microchip Polarfire FPGAs
+	  programming over slave SPI interface with .dat formatted
+	  bitstream image.
+
 endif # FPGA
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index e32bfa90f968..5425a15892df 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_FPGA_MGR_XILINX_SPI)	+= xilinx-spi.o
 obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)	+= zynq-fpga.o
 obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA)	+= zynqmp-fpga.o
 obj-$(CONFIG_FPGA_MGR_VERSAL_FPGA)	+= versal-fpga.o
+obj-$(CONFIG_FPGA_MGR_MICROCHIP_SPI)	+= microchip-spi.o
 obj-$(CONFIG_ALTERA_PR_IP_CORE)		+= altera-pr-ip-core.o
 obj-$(CONFIG_ALTERA_PR_IP_CORE_PLAT)	+= altera-pr-ip-core-plat.o
 
diff --git a/drivers/fpga/microchip-spi.c b/drivers/fpga/microchip-spi.c
new file mode 100644
index 000000000000..a6ec88d34940
--- /dev/null
+++ b/drivers/fpga/microchip-spi.c
@@ -0,0 +1,369 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip Polarfire FPGA programming over slave SPI interface.
+ */
+
+#include <linux/delay.h>
+#include <linux/fpga/fpga-mgr.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/spi/spi.h>
+
+#define	MPF_SPI_ISC_ENABLE	0x0B
+#define	MPF_SPI_ISC_DISABLE	0x0C
+#define	MPF_SPI_READ_STATUS	0x00
+#define	MPF_SPI_READ_DATA	0x01
+#define	MPF_SPI_FRAME_INIT	0xAE
+#define	MPF_SPI_FRAME		0xEE
+#define	MPF_SPI_PRG_MODE	0x01
+#define	MPF_SPI_RELEASE		0x23
+
+#define	MPF_SPI_FRAME_SIZE	16
+
+#define	MPF_HEADER_SIZE_OFFSET	24
+#define	MPF_DATA_SIZE_OFFSET	55
+
+#define	MPF_LOOKUP_TABLE_RECORD_SIZE		9
+#define	MPF_LOOKUP_TABLE_BLOCK_ID_OFFSET	0
+#define	MPF_LOOKUP_TABLE_BLOCK_START_OFFSET	1
+
+#define	MPF_COMPONENTS_SIZE_ID	5
+#define	MPF_BITSTREAM_ID	8
+
+#define	MPF_BITS_PER_COMPONENT_SIZE	22
+
+#define	MPF_STATUS_POLL_TIMEOUT		1000
+#define	MPF_STATUS_BUSY			BIT(0)
+#define	MPF_STATUS_READY		BIT(1)
+#define	MPF_STATUS_SPI_VIOLATION	BIT(2)
+#define	MPF_STATUS_SPI_ERROR		BIT(3)
+
+struct mpf_priv {
+	struct spi_device *spi;
+	bool program_mode;
+};
+
+static int mpf_read_status(struct spi_device *spi)
+{
+	u8 status, status_command = MPF_SPI_READ_STATUS;
+	struct spi_transfer xfer = {
+		.tx_buf = &status_command,
+		.rx_buf = &status,
+		.len = 1,
+	};
+	int ret = spi_sync_transfer(spi, &xfer, 1);
+
+	if ((status & MPF_STATUS_SPI_VIOLATION) ||
+	    (status & MPF_STATUS_SPI_ERROR))
+		ret = -EIO;
+
+	return ret ? : status;
+}
+
+static enum fpga_mgr_states mpf_ops_state(struct fpga_manager *mgr)
+{
+	struct mpf_priv *priv = mgr->priv;
+	struct spi_device *spi;
+	bool program_mode;
+	int status;
+
+	spi = priv->spi;
+	program_mode = priv->program_mode;
+	status = mpf_read_status(spi);
+
+	if (!program_mode && !status)
+		return FPGA_MGR_STATE_OPERATING;
+
+	return FPGA_MGR_STATE_UNKNOWN;
+}
+
+static int mpf_ops_parse_header(struct fpga_manager *mgr,
+				struct fpga_image_info *info,
+				const char *buf, size_t count)
+{
+	size_t component_size_byte_num, component_size_byte_off,
+	       components_size_start = 0, bitstream_start = 0,
+	       block_id_offset, block_start_offset, i;
+	u8 header_size, blocks_num, block_id;
+	u32 block_start, component_size;
+	u16 components_num;
+
+	if (!buf) {
+		dev_err(&mgr->dev, "Image buffer is not provided\n");
+		return -EINVAL;
+	}
+
+	header_size = *(buf + MPF_HEADER_SIZE_OFFSET);
+	if (header_size > count) {
+		info->header_size = header_size;
+		return -EAGAIN;
+	}
+
+	/*
+	 * Go through look-up table to find out where actual bitstream starts
+	 * and where sizes of components of the bitstream lies.
+	 */
+	blocks_num = *(buf + header_size - 1);
+	block_id_offset = header_size + MPF_LOOKUP_TABLE_BLOCK_ID_OFFSET;
+	block_start_offset = header_size + MPF_LOOKUP_TABLE_BLOCK_START_OFFSET;
+
+	header_size += blocks_num * MPF_LOOKUP_TABLE_RECORD_SIZE;
+	if (header_size > count) {
+		info->header_size = header_size;
+		return -EAGAIN;
+	}
+
+	while (blocks_num--) {
+		block_id = *(buf + block_id_offset);
+		block_start = get_unaligned_le32(buf + block_start_offset);
+
+		switch (block_id) {
+		case MPF_BITSTREAM_ID:
+			info->header_size = bitstream_start = block_start;
+			if (block_start > count)
+				return -EAGAIN;
+
+			break;
+		case MPF_COMPONENTS_SIZE_ID:
+			components_size_start = block_start;
+			break;
+		default:
+			break;
+		}
+
+		if (bitstream_start && components_size_start)
+			break;
+
+		block_id_offset += MPF_LOOKUP_TABLE_RECORD_SIZE;
+		block_start_offset += MPF_LOOKUP_TABLE_RECORD_SIZE;
+	}
+
+	if (!bitstream_start || !components_size_start) {
+		dev_err(&mgr->dev, "Failed to parse header look-up table\n");
+		return -EFAULT;
+	}
+
+	/*
+	 * Parse bitstream size.
+	 * Sizes of components of the bitstream are 22-bits long placed next
+	 * to each other. Image header should be extended by now up to where
+	 * actual bitstream starts, so no need for overflow check anymore.
+	 */
+	components_num = get_unaligned_le16(buf + MPF_DATA_SIZE_OFFSET);
+
+	for (i = 0; i < components_num; i++) {
+		component_size_byte_num =
+			(i * MPF_BITS_PER_COMPONENT_SIZE) / BITS_PER_BYTE;
+		component_size_byte_off =
+			(i * MPF_BITS_PER_COMPONENT_SIZE) % BITS_PER_BYTE;
+
+		component_size = get_unaligned_le32(buf +
+						    components_size_start +
+						    component_size_byte_num);
+		component_size >>= component_size_byte_off;
+		component_size &= GENMASK(MPF_BITS_PER_COMPONENT_SIZE - 1, 0);
+
+		info->data_size += component_size * MPF_SPI_FRAME_SIZE;
+	}
+
+	return 0;
+}
+
+static int poll_status_not_busy(struct spi_device *spi, u8 mask)
+{
+	int status, timeout = MPF_STATUS_POLL_TIMEOUT;
+
+	while (timeout--) {
+		status = mpf_read_status(spi);
+		if (status < 0 ||
+		    (!(status & MPF_STATUS_BUSY) && (!mask || (status & mask))))
+			return status;
+
+		usleep_range(1000, 2000);
+	}
+
+	return -EBUSY;
+}
+
+static int mpf_spi_write(struct spi_device *spi, const void *buf, size_t buf_size)
+{
+	int status = poll_status_not_busy(spi, 0);
+
+	if (status < 0)
+		return status;
+
+	return spi_write(spi, buf, buf_size);
+}
+
+static int mpf_spi_write_then_read(struct spi_device *spi,
+				   const void *txbuf, size_t txbuf_size,
+				   void *rxbuf, size_t rxbuf_size)
+{
+	const u8 read_command[] = { MPF_SPI_READ_DATA };
+	int ret;
+
+	ret = mpf_spi_write(spi, txbuf, txbuf_size);
+	if (ret)
+		return ret;
+
+	ret = poll_status_not_busy(spi, MPF_STATUS_READY);
+	if (ret < 0)
+		return ret;
+
+	return spi_write_then_read(spi, read_command, sizeof(read_command),
+				   rxbuf, rxbuf_size);
+}
+
+static int mpf_ops_write_init(struct fpga_manager *mgr,
+			      struct fpga_image_info *info, const char *buf,
+			      size_t count)
+{
+	const u8 program_mode[] = { MPF_SPI_FRAME_INIT, MPF_SPI_PRG_MODE };
+	const u8 isc_en_command[] = { MPF_SPI_ISC_ENABLE };
+	struct mpf_priv *priv = mgr->priv;
+	struct device *dev = &mgr->dev;
+	struct spi_device *spi;
+	u32 isc_ret;
+	int ret;
+
+	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
+		dev_err(dev, "Partial reconfiguration is not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	spi = priv->spi;
+
+	ret = mpf_spi_write_then_read(spi, isc_en_command, sizeof(isc_en_command),
+				      &isc_ret, sizeof(isc_ret));
+	if (ret || isc_ret) {
+		dev_err(dev, "Failed to enable ISC: %d\n", ret ? : isc_ret);
+		return -EFAULT;
+	}
+
+	ret = mpf_spi_write(spi, program_mode, sizeof(program_mode));
+	if (ret) {
+		dev_err(dev, "Failed to enter program mode: %d\n", ret);
+		return ret;
+	}
+
+	priv->program_mode = true;
+
+	return 0;
+}
+
+static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count)
+{
+	u8 tmp_buf[MPF_SPI_FRAME_SIZE + 1] = { MPF_SPI_FRAME, };
+	struct mpf_priv *priv = mgr->priv;
+	struct device *dev = &mgr->dev;
+	struct spi_device *spi;
+	int ret, i;
+
+	if (count % MPF_SPI_FRAME_SIZE) {
+		dev_err(dev, "Bitstream size is not a multiple of %d\n",
+			MPF_SPI_FRAME_SIZE);
+		return -EINVAL;
+	}
+
+	spi = priv->spi;
+
+	for (i = 0; i < count / MPF_SPI_FRAME_SIZE; i++) {
+		memcpy(tmp_buf + 1, buf + i * MPF_SPI_FRAME_SIZE,
+		       MPF_SPI_FRAME_SIZE);
+
+		ret = mpf_spi_write(spi, tmp_buf, sizeof(tmp_buf));
+		if (ret) {
+			dev_err(dev, "Failed to write bitstream frame %d/%zd\n",
+				i, count / MPF_SPI_FRAME_SIZE);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int mpf_ops_write_complete(struct fpga_manager *mgr,
+				  struct fpga_image_info *info)
+{
+	const u8 isc_dis_command[] = { MPF_SPI_ISC_DISABLE };
+	const u8 release_command[] = { MPF_SPI_RELEASE };
+	struct mpf_priv *priv = mgr->priv;
+	struct device *dev = &mgr->dev;
+	struct spi_device *spi;
+	int ret;
+
+	spi = priv->spi;
+
+	ret = mpf_spi_write(spi, isc_dis_command, sizeof(isc_dis_command));
+	if (ret) {
+		dev_err(dev, "Failed to disable ISC: %d\n", ret);
+		return ret;
+	}
+
+	usleep_range(1000, 2000);
+
+	ret = mpf_spi_write(spi, release_command, sizeof(release_command));
+	if (ret) {
+		dev_err(dev, "Failed to exit program mode: %d\n", ret);
+		return ret;
+	}
+
+	priv->program_mode = false;
+
+	return 0;
+}
+
+static const struct fpga_manager_ops mpf_ops = {
+	.state = mpf_ops_state,
+	.initial_header_size = 71,
+	.parse_header = mpf_ops_parse_header,
+	.write_init = mpf_ops_write_init,
+	.write = mpf_ops_write,
+	.write_complete = mpf_ops_write_complete,
+};
+
+static int mpf_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct fpga_manager *mgr;
+	struct mpf_priv *priv;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->spi = spi;
+
+	mgr = devm_fpga_mgr_register(dev, "Microchip Polarfire SPI FPGA Manager",
+				     &mpf_ops, priv);
+
+	return PTR_ERR_OR_ZERO(mgr);
+}
+
+static const struct spi_device_id mpf_spi_ids[] = {
+	{ .name = "mpf-spi-fpga-mgr", },
+	{},
+};
+MODULE_DEVICE_TABLE(spi, mpf_spi_ids);
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id mpf_of_ids[] = {
+	{ .compatible = "microchip,mpf-spi-fpga-mgr" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mpf_of_ids);
+#endif /* IS_ENABLED(CONFIG_OF) */
+
+static struct spi_driver mpf_driver = {
+	.probe = mpf_probe,
+	.id_table = mpf_spi_ids,
+	.driver = {
+		.name = "microchip_mpf_spi_fpga_mgr",
+		.of_match_table = of_match_ptr(mpf_of_ids),
+	},
+};
+
+module_spi_driver(mpf_driver);
+
+MODULE_DESCRIPTION("Microchip Polarfire SPI FPGA Manager");
+MODULE_LICENSE("GPL");
-- 
2.35.1

[PATCH v10 3/3] dt-bindings: fpga: add binding doc for microchip-spi fpga mgr

[Ivan Bornyakov]

Add Device Tree Binding doc for Microchip Polarfire FPGA Manager using
slave SPI to load .dat formatted bitstream image.

Signed-off-by: Ivan Bornyakov <i.bornyakov@metrotek.ru>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../fpga/microchip,mpf-spi-fpga-mgr.yaml      | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/microchip,mpf-spi-fpga-mgr.yaml

diff --git a/Documentation/devicetree/bindings/fpga/microchip,mpf-spi-fpga-mgr.yaml b/Documentation/devicetree/bindings/fpga/microchip,mpf-spi-fpga-mgr.yaml
new file mode 100644
index 000000000000..aee45cb15592
--- /dev/null
+++ b/Documentation/devicetree/bindings/fpga/microchip,mpf-spi-fpga-mgr.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/fpga/microchip,mpf-spi-fpga-mgr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip Polarfire FPGA manager.
+
+maintainers:
+  - Ivan Bornyakov <i.bornyakov@metrotek.ru>
+
+description:
+  Device Tree Bindings for Microchip Polarfire FPGA Manager using slave SPI to
+  load the bitstream in .dat format.
+
+properties:
+  compatible:
+    enum:
+      - microchip,mpf-spi-fpga-mgr
+
+  reg:
+    description: SPI chip select
+    maxItems: 1
+
+  spi-max-frequency: true
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    spi {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            fpga_mgr@0 {
+                    compatible = "microchip,mpf-spi-fpga-mgr";
+                    spi-max-frequency = <20000000>;
+                    reg = <0>;
+            };
+    };
-- 
2.35.1

Re: [PATCH v10 2/3] fpga: microchip-spi: add Microchip MPF FPGA manager

[kernel test robot]

Hi Ivan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20220506]
[cannot apply to robh/for-next linus/master v5.18-rc5 v5.18-rc4 v5.18-rc3 v5.18-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Ivan-Bornyakov/Microchip-Polarfire-FPGA-manager/20220506-212355
base:    38a288f5941ef03752887ad86f2d85442358c99a
config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20220507/202205070006.tWQ4lFSL-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 11.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/9c87e90e1315e8a6028064516aef34a05f3f9625
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Ivan-Bornyakov/Microchip-Polarfire-FPGA-manager/20220506-212355
        git checkout 9c87e90e1315e8a6028064516aef34a05f3f9625
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash drivers/fpga/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/fpga/microchip-spi.c: In function 'mpf_ops_parse_header':
>> drivers/fpga/microchip-spi.c:118:31: error: implicit declaration of function 'get_unaligned_le32' [-Werror=implicit-function-declaration]
     118 |                 block_start = get_unaligned_le32(buf + block_start_offset);
         |                               ^~~~~~~~~~~~~~~~~~
>> drivers/fpga/microchip-spi.c:152:26: error: implicit declaration of function 'get_unaligned_le16' [-Werror=implicit-function-declaration]
     152 |         components_num = get_unaligned_le16(buf + MPF_DATA_SIZE_OFFSET);
         |                          ^~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/get_unaligned_le32 +118 drivers/fpga/microchip-spi.c

    79	
    80	static int mpf_ops_parse_header(struct fpga_manager *mgr,
    81					struct fpga_image_info *info,
    82					const char *buf, size_t count)
    83	{
    84		size_t component_size_byte_num, component_size_byte_off,
    85		       components_size_start = 0, bitstream_start = 0,
    86		       block_id_offset, block_start_offset, i;
    87		u8 header_size, blocks_num, block_id;
    88		u32 block_start, component_size;
    89		u16 components_num;
    90	
    91		if (!buf) {
    92			dev_err(&mgr->dev, "Image buffer is not provided\n");
    93			return -EINVAL;
    94		}
    95	
    96		header_size = *(buf + MPF_HEADER_SIZE_OFFSET);
    97		if (header_size > count) {
    98			info->header_size = header_size;
    99			return -EAGAIN;
   100		}
   101	
   102		/*
   103		 * Go through look-up table to find out where actual bitstream starts
   104		 * and where sizes of components of the bitstream lies.
   105		 */
   106		blocks_num = *(buf + header_size - 1);
   107		block_id_offset = header_size + MPF_LOOKUP_TABLE_BLOCK_ID_OFFSET;
   108		block_start_offset = header_size + MPF_LOOKUP_TABLE_BLOCK_START_OFFSET;
   109	
   110		header_size += blocks_num * MPF_LOOKUP_TABLE_RECORD_SIZE;
   111		if (header_size > count) {
   112			info->header_size = header_size;
   113			return -EAGAIN;
   114		}
   115	
   116		while (blocks_num--) {
   117			block_id = *(buf + block_id_offset);
 > 118			block_start = get_unaligned_le32(buf + block_start_offset);
   119	
   120			switch (block_id) {
   121			case MPF_BITSTREAM_ID:
   122				info->header_size = bitstream_start = block_start;
   123				if (block_start > count)
   124					return -EAGAIN;
   125	
   126				break;
   127			case MPF_COMPONENTS_SIZE_ID:
   128				components_size_start = block_start;
   129				break;
   130			default:
   131				break;
   132			}
   133	
   134			if (bitstream_start && components_size_start)
   135				break;
   136	
   137			block_id_offset += MPF_LOOKUP_TABLE_RECORD_SIZE;
   138			block_start_offset += MPF_LOOKUP_TABLE_RECORD_SIZE;
   139		}
   140	
   141		if (!bitstream_start || !components_size_start) {
   142			dev_err(&mgr->dev, "Failed to parse header look-up table\n");
   143			return -EFAULT;
   144		}
   145	
   146		/*
   147		 * Parse bitstream size.
   148		 * Sizes of components of the bitstream are 22-bits long placed next
   149		 * to each other. Image header should be extended by now up to where
   150		 * actual bitstream starts, so no need for overflow check anymore.
   151		 */
 > 152		components_num = get_unaligned_le16(buf + MPF_DATA_SIZE_OFFSET);
   153	
   154		for (i = 0; i < components_num; i++) {
   155			component_size_byte_num =
   156				(i * MPF_BITS_PER_COMPONENT_SIZE) / BITS_PER_BYTE;
   157			component_size_byte_off =
   158				(i * MPF_BITS_PER_COMPONENT_SIZE) % BITS_PER_BYTE;
   159	
   160			component_size = get_unaligned_le32(buf +
   161							    components_size_start +
   162							    component_size_byte_num);
   163			component_size >>= component_size_byte_off;
   164			component_size &= GENMASK(MPF_BITS_PER_COMPONENT_SIZE - 1, 0);
   165	
   166			info->data_size += component_size * MPF_SPI_FRAME_SIZE;
   167		}
   168	
   169		return 0;
   170	}
   171	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp