fpga.c
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/*
* Copyright (C) 2016 Stefan Roese <sr@denx.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <altera.h>
#include <errno.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>
#include <asm/arch-mvebu/spi.h>
#include "theadorable.h"
/*
* FPGA programming support
*/
static int fpga_pre_fn(int cookie)
{
int gpio_config = COOKIE2CONFIG(cookie);
int gpio_done = COOKIE2DONE(cookie);
int ret;
debug("%s (%d): cookie=%08x gpio_config=%d gpio_done=%d\n",
__func__, __LINE__, cookie, gpio_config, gpio_done);
/* Configure config pin */
/* Set to output */
ret = gpio_request(gpio_config, "CONFIG");
if (ret < 0)
return ret;
gpio_direction_output(gpio_config, 1);
/* Configure done pin */
/* Set to input */
ret = gpio_request(gpio_done, "DONE");
if (ret < 0)
return ret;
gpio_direction_input(gpio_done);
return 0;
}
static int fpga_config_fn(int assert, int flush, int cookie)
{
int gpio_config = COOKIE2CONFIG(cookie);
debug("%s (%d): cookie=%08x gpio_config=%d\n",
__func__, __LINE__, cookie, gpio_config);
if (assert)
gpio_set_value(gpio_config, 1);
else
gpio_set_value(gpio_config, 0);
return 0;
}
static int fpga_write_fn(const void *buf, size_t len, int flush, int cookie)
{
int spi_bus = COOKIE2SPI_BUS(cookie);
int spi_dev = COOKIE2SPI_DEV(cookie);
struct kwspi_registers *reg;
u32 control_reg;
u32 config_reg;
void *dst;
/*
* Write data to FPGA attached to SPI bus via SPI direct write.
* This results in the fastest and easiest way to program the
* bitstream into the FPGA.
*/
debug("%s (%d): cookie=%08x spi_bus=%d spi_dev=%d\n",
__func__, __LINE__, cookie, spi_bus, spi_dev);
if (spi_bus == 0) {
reg = (struct kwspi_registers *)MVEBU_REGISTER(0x10600);
dst = (void *)SPI_BUS0_DEV1_BASE;
} else {
reg = (struct kwspi_registers *)MVEBU_REGISTER(0x10680);
dst = (void *)SPI_BUS1_DEV2_BASE;
}
/* Configure SPI controller for direct access mode */
control_reg = readl(®->ctrl);
config_reg = readl(®->cfg);
writel(0x00000214, ®->cfg); /* 27MHz clock */
writel(0x00000000, ®->dw_cfg); /* don't de-asset CS */
writel(KWSPI_CSN_ACT, ®->ctrl); /* activate CS */
/* Copy data to the SPI direct mapped window */
memcpy(dst, buf, len);
/* Restore original register values */
writel(control_reg, ®->ctrl);
writel(config_reg, ®->cfg);
return 0;
}
/* Returns the state of CONF_DONE Pin */
static int fpga_done_fn(int cookie)
{
int gpio_done = COOKIE2DONE(cookie);
unsigned long ts;
debug("%s (%d): cookie=%08x gpio_done=%d\n",
__func__, __LINE__, cookie, gpio_done);
ts = get_timer(0);
do {
if (gpio_get_value(gpio_done))
return 0;
} while (get_timer(ts) < 1000);
/* timeout so return error */
return -ENODEV;
}
static altera_board_specific_func stratixv_fns = {
.pre = fpga_pre_fn,
.config = fpga_config_fn,
.write = fpga_write_fn,
.done = fpga_done_fn,
};
static Altera_desc altera_fpga[] = {
{
/* Family */
Altera_StratixV,
/* Interface type */
passive_serial,
/* No limitation as additional data will be ignored */
-1,
/* Device function table */
(void *)&stratixv_fns,
/* Base interface address specified in driver */
NULL,
/* Cookie implementation */
/*
* In this 32bit word the following information is coded:
* Bit 31 ... Bit 0
* SPI-Bus | SPI-Dev | Config-Pin | Done-Pin
*/
FPGA_COOKIE(0, 1, 26, 7)
},
{
/* Family */
Altera_StratixV,
/* Interface type */
passive_serial,
/* No limitation as additional data will be ignored */
-1,
/* Device function table */
(void *)&stratixv_fns,
/* Base interface address specified in driver */
NULL,
/* Cookie implementation */
/*
* In this 32bit word the following information is coded:
* Bit 31 ... Bit 0
* SPI-Bus | SPI-Dev | Config-Pin | Done-Pin
*/
FPGA_COOKIE(1, 2, 29, 9)
},
};
/* Add device descriptor to FPGA device table */
void board_fpga_add(void)
{
int i;
fpga_init();
for (i = 0; i < ARRAY_SIZE(altera_fpga); i++)
fpga_add(fpga_altera, &altera_fpga[i]);
}