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a52e3a9dba
Factor out the gpio handshaking (using PROGRAM_B, INIT_B and DONE) protocol in xilinx-core so that it can be reused for another driver. This commit does not change anything functionally to xilinx-spi. xilinx-core expects drivers to provide a write(const char* buf, size_t count) function that performs the actual write to the device, as well as a struct device* for resource management. Signed-off-by: Charles Perry <charles.perry@savoirfairelinux.com> Acked-by: Xu Yilun <yilun.xu@intel.com> Link: https://lore.kernel.org/r/20240321220447.3260065-2-charles.perry@savoirfairelinux.com Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Xilinx Spartan6 and 7 Series Slave Serial SPI Driver
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*
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* Copyright (C) 2017 DENX Software Engineering
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*
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* Anatolij Gustschin <agust@denx.de>
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*
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* Manage Xilinx FPGA firmware that is loaded over SPI using
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* the slave serial configuration interface.
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*/
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#include "xilinx-core.h"
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/of.h>
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#include <linux/spi/spi.h>
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static int xilinx_spi_write(struct xilinx_fpga_core *core, const char *buf,
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size_t count)
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{
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struct spi_device *spi = to_spi_device(core->dev);
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const char *fw_data = buf;
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const char *fw_data_end = fw_data + count;
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while (fw_data < fw_data_end) {
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size_t remaining, stride;
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int ret;
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remaining = fw_data_end - fw_data;
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stride = min_t(size_t, remaining, SZ_4K);
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ret = spi_write(spi, fw_data, stride);
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if (ret) {
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dev_err(core->dev, "SPI error in firmware write: %d\n",
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ret);
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return ret;
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}
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fw_data += stride;
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}
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return 0;
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}
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static int xilinx_spi_probe(struct spi_device *spi)
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{
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struct xilinx_fpga_core *core;
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core = devm_kzalloc(&spi->dev, sizeof(*core), GFP_KERNEL);
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if (!core)
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return -ENOMEM;
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core->dev = &spi->dev;
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core->write = xilinx_spi_write;
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return xilinx_core_probe(core);
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}
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#ifdef CONFIG_OF
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static const struct of_device_id xlnx_spi_of_match[] = {
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{
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.compatible = "xlnx,fpga-slave-serial",
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},
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{}
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};
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MODULE_DEVICE_TABLE(of, xlnx_spi_of_match);
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#endif
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static struct spi_driver xilinx_slave_spi_driver = {
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.driver = {
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.name = "xlnx-slave-spi",
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.of_match_table = of_match_ptr(xlnx_spi_of_match),
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},
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.probe = xilinx_spi_probe,
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};
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module_spi_driver(xilinx_slave_spi_driver)
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>");
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MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SPI");
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