linux/drivers/fpga/altera-ps-spi.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Altera Passive Serial SPI Driver
 *
 *  Copyright (c) 2017 United Western Technologies, Corporation
 *
 *  Joshua Clayton <[email protected]>
 *
 * Manage Altera FPGA firmware that is loaded over SPI using the passive
 * serial configuration method.
 * Firmware must be in binary "rbf" format.
 * Works on Arria 10, Cyclone V and Stratix V. Should work on Cyclone series.
 * May work on other Altera FPGAs.
 */

#include <linux/bitrev.h>
#include <linux/delay.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/spi/spi.h>
#include <linux/sizes.h>

enum altera_ps_devtype { … };

struct altera_ps_data { … };

struct altera_ps_conf { … };

/*          |   Arria 10  |   Cyclone5  |   Stratix5  |
 * t_CF2ST0 |     [; 600] |     [; 600] |     [; 600] |ns
 * t_CFG    |        [2;] |        [2;] |        [2;] |µs
 * t_STATUS | [268; 3000] | [268; 1506] | [268; 1506] |µs
 * t_CF2ST1 |    [; 3000] |    [; 1506] |    [; 1506] |µs
 * t_CF2CK  |     [3010;] |     [1506;] |     [1506;] |µs
 * t_ST2CK  |       [10;] |        [2;] |        [2;] |µs
 * t_CD2UM  |  [175; 830] |  [175; 437] |  [175; 437] |µs
 */
static struct altera_ps_data c5_data = …;

static struct altera_ps_data a10_data = …;

static const struct of_device_id of_ef_match[] = …;
MODULE_DEVICE_TABLE(of, of_ef_match);

static enum fpga_mgr_states altera_ps_state(struct fpga_manager *mgr)
{ … }

static inline void altera_ps_delay(int delay_us)
{ … }

static int altera_ps_write_init(struct fpga_manager *mgr,
				struct fpga_image_info *info,
				const char *buf, size_t count)
{ … }

static void rev_buf(char *buf, size_t len)
{ … }

static int altera_ps_write(struct fpga_manager *mgr, const char *buf,
			   size_t count)
{ … }

static int altera_ps_write_complete(struct fpga_manager *mgr,
				    struct fpga_image_info *info)
{ … }

static const struct fpga_manager_ops altera_ps_ops = …;

static int altera_ps_probe(struct spi_device *spi)
{ … }

static const struct spi_device_id altera_ps_spi_ids[] = …;
MODULE_DEVICE_TABLE(spi, altera_ps_spi_ids);

static struct spi_driver altera_ps_driver = …;

module_spi_driver(…) …

MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;