forked from mirrors/linux
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
|
|
/*
|
|
* Xilinx Spartan6 and 7 Series Slave Serial SPI Driver
|
|
*
|
|
* Copyright (C) 2017 DENX Software Engineering
|
|
*
|
|
* Anatolij Gustschin <agust@denx.de>
|
|
*
|
|
* Manage Xilinx FPGA firmware that is loaded over SPI using
|
|
* the slave serial configuration interface.
|
|
*/
|
|
|
|
#include "xilinx-core.h"
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/of.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
static int xilinx_spi_write(struct xilinx_fpga_core *core, const char *buf,
|
|
size_t count)
|
|
{
|
|
struct spi_device *spi = to_spi_device(core->dev);
|
|
const char *fw_data = buf;
|
|
const char *fw_data_end = fw_data + count;
|
|
|
|
while (fw_data < fw_data_end) {
|
|
size_t remaining, stride;
|
|
int ret;
|
|
|
|
remaining = fw_data_end - fw_data;
|
|
stride = min_t(size_t, remaining, SZ_4K);
|
|
|
|
ret = spi_write(spi, fw_data, stride);
|
|
if (ret) {
|
|
dev_err(core->dev, "SPI error in firmware write: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
fw_data += stride;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xilinx_spi_probe(struct spi_device *spi)
|
|
{
|
|
struct xilinx_fpga_core *core;
|
|
|
|
core = devm_kzalloc(&spi->dev, sizeof(*core), GFP_KERNEL);
|
|
if (!core)
|
|
return -ENOMEM;
|
|
|
|
core->dev = &spi->dev;
|
|
core->write = xilinx_spi_write;
|
|
|
|
return xilinx_core_probe(core);
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id xlnx_spi_of_match[] = {
|
|
{
|
|
.compatible = "xlnx,fpga-slave-serial",
|
|
},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, xlnx_spi_of_match);
|
|
#endif
|
|
|
|
static struct spi_driver xilinx_slave_spi_driver = {
|
|
.driver = {
|
|
.name = "xlnx-slave-spi",
|
|
.of_match_table = of_match_ptr(xlnx_spi_of_match),
|
|
},
|
|
.probe = xilinx_spi_probe,
|
|
};
|
|
|
|
module_spi_driver(xilinx_slave_spi_driver)
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>");
|
|
MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SPI");
|