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 v10 -> v11: include missing unaligned.h to microchip-spi fix error: implicit declaration of function 'get_unaligned_le[16|32]' v11 -> v12: * microchip-spi: double read hw status, ignore first read, because it can be unreliable. * microchip-spi: remove sleep between status readings in poll_status_not_busy() to save a few seconds. Status is polled on every 16 byte writes - that is quite often, therefore usleep_range() accumulate to a considerable number of seconds. v12 -> v13: * fpga-mgr: separate fpga_mgr_parse_header_buf() from fpga_mgr_write_init_buf() * fpga-mgr: introduce FPGA_MGR_STATE_PARSE_HEADER and FPGA_MGR_STATE_PARSE_HEADER_ERR fpga_mgr_states * fpga-mgr: rename fpga_mgr_write_init_sg() to fpga_mgr_prepare_sg() and rework with respect to a new fpga_mgr_parse_header_buf() * fpga-mgr: rework write accounting in fpga_mgr_buf_load_sg() for better clarity * microchip-spi: rename MPF_STATUS_POLL_TIMEOUT to MPF_STATUS_POLL_RETRIES * microchip-spi: add comment about status reading quirk to mpf_read_status() * microchip-spi: rename poll_status_not_busy() to mpf_poll_status() and add comment. * microchip-spi: make if statement in mpf_poll_status() easier to read. v13 -> v14: * fpga-mgr: improvements from Xu Yilun in - fpga_mgr_parse_header_buf() - fpga_mgr_write_init_buf() - fpga_mgr_prepare_sg() - fpga_mgr_buf_load_sg() * fpga-mgr: add check for -EAGAIN from fpga_mgr_parse_header_buf() when called from fpga_mgr_buf_load_mapped() * microchip-spi: remove excessive cs_change from second spi_transfer in mpf_read_status() * microchip-spi: change type of components_size_start, bitstream_start, i from size_t to u32 in mpf_ops_parse_header() v14 -> v15: eliminate memcpy() in mpf_ops_write() Eliminate excessive memcpy() in mpf_ops_write() by using spi_sync_transfer() instead of spi_write(). v15 -> v16: * microchip-spi: change back components_size_start and bitstream_start variables types to size_t, i - to u16 in mpf_ops_parse_header() * fpga-mgr: rename fpga_parse_header_buf() to fpga_parse_header_mapped(). It serves only mapped FPGA image now, adjust it accordingly. * fpga-mgr: separate fpga_mgr_parse_header_sg_first() and fpga_mgr_parse_header_sg() from fpga_mgr_prepare_sg() v16 -> v17: * fpga-mgr: return size of allocated header from fpga_mgr_parse_header_sg(), add `char **ret_buf` to function args to save pointer to allocated header. This allow us to call fpga_mgr_write_init_buf() with exact size of allocated header. * document parse_header() callback in fpga-mgr.rst v17 -> v18: * fpga-mgr: change back fpga_mgr_parse_header_sg() to return allocated buffer but set buffer size into output parameter * fpga-mgr: check returned pointer from krealloc for ZERO_OR_NULL_PTR in fpga_mgr_paese_header_sg() as krealloc may return ZERO_SIZE_PTR. * fpga-mgr: in fpga_mgr_prepare_sg() return fpga_mgr_write_init() on fast path only when both initial_header_size and parse_header() are not defined. * docs: fpga-mgr: a few rewords from Xu Yilun v18 -> v19: * microchip-spi: split multiple assignments on a single line in functions mpf_read_status() and mpf_ops_parse_header() * fpga-mgr: add braces {} around "else if" arm in fpga_mgr_prepare_sg() * fpga-mgr: don't reuse krealloc() arg in fpga_mgr_parse_header_sg(). If krealloc() returns NULL, it doesn't free the original. Ivan Bornyakov (4): fpga: fpga-mgr: support bitstream offset in image buffer docs: fpga: mgr: document parse_header() callback 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 ++ Documentation/driver-api/fpga/fpga-mgr.rst | 31 +- drivers/fpga/Kconfig | 8 + drivers/fpga/Makefile | 1 + drivers/fpga/fpga-mgr.c | 237 +++++++++-- drivers/fpga/microchip-spi.c | 397 ++++++++++++++++++ include/linux/fpga/fpga-mgr.h | 17 +- 7 files changed, 700 insertions(+), 35 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