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// SPDX-License-Identifier: GPL-2.0
/*
* Lattice FPGA sysCONFIG interface functions independent of port type.
*/
#include <linux/delay.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/gpio/consumer.h>
#include <linux/iopoll.h>
#include "lattice-sysconfig.h"
static int sysconfig_cmd_write(struct sysconfig_priv *priv, const void *buf,
size_t buf_len)
{
return priv->command_transfer(priv, buf, buf_len, NULL, 0);
}
static int sysconfig_cmd_read(struct sysconfig_priv *priv, const void *tx_buf,
size_t tx_len, void *rx_buf, size_t rx_len)
{
return priv->command_transfer(priv, tx_buf, tx_len, rx_buf, rx_len);
}
static int sysconfig_read_busy(struct sysconfig_priv *priv)
{
const u8 lsc_check_busy[] = SYSCONFIG_LSC_CHECK_BUSY;
u8 busy;
int ret;
ret = sysconfig_cmd_read(priv, lsc_check_busy, sizeof(lsc_check_busy),
&busy, sizeof(busy));
return ret ? : busy;
}
static int sysconfig_poll_busy(struct sysconfig_priv *priv)
{
int ret, busy;
ret = read_poll_timeout(sysconfig_read_busy, busy, busy <= 0,
SYSCONFIG_POLL_INTERVAL_US,
SYSCONFIG_POLL_BUSY_TIMEOUT_US, false, priv);
return ret ? : busy;
}
static int sysconfig_read_status(struct sysconfig_priv *priv, u32 *status)
{
const u8 lsc_read_status[] = SYSCONFIG_LSC_READ_STATUS;
__be32 device_status;
int ret;
ret = sysconfig_cmd_read(priv, lsc_read_status, sizeof(lsc_read_status),
&device_status, sizeof(device_status));
if (ret)
return ret;
*status = be32_to_cpu(device_status);
return 0;
}
static int sysconfig_poll_status(struct sysconfig_priv *priv, u32 *status)
{
int ret = sysconfig_poll_busy(priv);
if (ret)
return ret;
return sysconfig_read_status(priv, status);
}
static int sysconfig_poll_gpio(struct gpio_desc *gpio, bool is_active)
{
int ret, val;
ret = read_poll_timeout(gpiod_get_value, val,
val < 0 || !!val == is_active,
SYSCONFIG_POLL_INTERVAL_US,
SYSCONFIG_POLL_GPIO_TIMEOUT_US, false, gpio);
if (val < 0)
return val;
return ret;
}
static int sysconfig_gpio_refresh(struct sysconfig_priv *priv)
{
struct gpio_desc *program = priv->program;
struct gpio_desc *init = priv->init;
struct gpio_desc *done = priv->done;
int ret;
/* Enter init mode */
gpiod_set_value(program, 1);
ret = sysconfig_poll_gpio(init, true);
if (!ret)
ret = sysconfig_poll_gpio(done, false);
if (ret)
return ret;
/* Enter program mode */
gpiod_set_value(program, 0);
return sysconfig_poll_gpio(init, false);
}
static int sysconfig_lsc_refresh(struct sysconfig_priv *priv)
{
static const u8 lsc_refresh[] = SYSCONFIG_LSC_REFRESH;
int ret;
ret = sysconfig_cmd_write(priv, lsc_refresh, sizeof(lsc_refresh));
if (ret)
return ret;
usleep_range(4000, 8000);
return 0;
}
static int sysconfig_refresh(struct sysconfig_priv *priv)
{
struct gpio_desc *program = priv->program;
struct gpio_desc *init = priv->init;
struct gpio_desc *done = priv->done;
if (program && init && done)
return sysconfig_gpio_refresh(priv);
return sysconfig_lsc_refresh(priv);
}
static int sysconfig_isc_enable(struct sysconfig_priv *priv)
{
u8 isc_enable[] = SYSCONFIG_ISC_ENABLE;
u32 status;
int ret;
ret = sysconfig_cmd_write(priv, isc_enable, sizeof(isc_enable));
if (ret)
return ret;
ret = sysconfig_poll_status(priv, &status);
if (ret)
return ret;
if (status & SYSCONFIG_STATUS_FAIL)
return -EFAULT;
return 0;
}
static int sysconfig_isc_erase(struct sysconfig_priv *priv)
{
u8 isc_erase[] = SYSCONFIG_ISC_ERASE;
u32 status;
int ret;
ret = sysconfig_cmd_write(priv, isc_erase, sizeof(isc_erase));
if (ret)
return ret;
ret = sysconfig_poll_status(priv, &status);
if (ret)
return ret;
if (status & SYSCONFIG_STATUS_FAIL)
return -EFAULT;
return 0;
}
static int sysconfig_isc_init(struct sysconfig_priv *priv)
{
int ret = sysconfig_isc_enable(priv);
if (ret)
return ret;
return sysconfig_isc_erase(priv);
}
static int sysconfig_lsc_init_addr(struct sysconfig_priv *priv)
{
const u8 lsc_init_addr[] = SYSCONFIG_LSC_INIT_ADDR;
return sysconfig_cmd_write(priv, lsc_init_addr, sizeof(lsc_init_addr));
}
static int sysconfig_burst_write_init(struct sysconfig_priv *priv)
{
return priv->bitstream_burst_write_init(priv);
}
static int sysconfig_burst_write_complete(struct sysconfig_priv *priv)
{
return priv->bitstream_burst_write_complete(priv);
}
static int sysconfig_bitstream_burst_write(struct sysconfig_priv *priv,
const char *buf, size_t count)
{
int ret = priv->bitstream_burst_write(priv, buf, count);
if (ret)
sysconfig_burst_write_complete(priv);
return ret;
}
static int sysconfig_isc_disable(struct sysconfig_priv *priv)
{
const u8 isc_disable[] = SYSCONFIG_ISC_DISABLE;
return sysconfig_cmd_write(priv, isc_disable, sizeof(isc_disable));
}
static void sysconfig_cleanup(struct sysconfig_priv *priv)
{
sysconfig_isc_erase(priv);
sysconfig_refresh(priv);
}
static int sysconfig_isc_finish(struct sysconfig_priv *priv)
{
struct gpio_desc *done_gpio = priv->done;
u32 status;
int ret;
if (done_gpio) {
ret = sysconfig_isc_disable(priv);
if (ret)
return ret;
return sysconfig_poll_gpio(done_gpio, true);
}
ret = sysconfig_poll_status(priv, &status);
if (ret)
return ret;
if ((status & SYSCONFIG_STATUS_DONE) &&
!(status & SYSCONFIG_STATUS_BUSY) &&
!(status & SYSCONFIG_STATUS_ERR))
return sysconfig_isc_disable(priv);
return -EFAULT;
}
static enum fpga_mgr_states sysconfig_ops_state(struct fpga_manager *mgr)
{
struct sysconfig_priv *priv = mgr->priv;
struct gpio_desc *done = priv->done;
u32 status;
int ret;
if (done && (gpiod_get_value(done) > 0))
return FPGA_MGR_STATE_OPERATING;
ret = sysconfig_read_status(priv, &status);
if (!ret && (status & SYSCONFIG_STATUS_DONE))
return FPGA_MGR_STATE_OPERATING;
return FPGA_MGR_STATE_UNKNOWN;
}
static int sysconfig_ops_write_init(struct fpga_manager *mgr,
struct fpga_image_info *info,
const char *buf, size_t count)
{
struct sysconfig_priv *priv = mgr->priv;
struct device *dev = &mgr->dev;
int ret;
if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
dev_err(dev, "Partial reconfiguration is not supported\n");
return -EOPNOTSUPP;
}
/* Enter program mode */
ret = sysconfig_refresh(priv);
if (ret) {
dev_err(dev, "Failed to go to program mode\n");
return ret;
}
/* Enter ISC mode */
ret = sysconfig_isc_init(priv);
if (ret) {
dev_err(dev, "Failed to go to ISC mode\n");
return ret;
}
/* Initialize the Address Shift Register */
ret = sysconfig_lsc_init_addr(priv);
if (ret) {
dev_err(dev,
"Failed to initialize the Address Shift Register\n");
return ret;
}
/* Prepare for bitstream burst write */
ret = sysconfig_burst_write_init(priv);
if (ret)
dev_err(dev, "Failed to prepare for bitstream burst write\n");
return ret;
}
static int sysconfig_ops_write(struct fpga_manager *mgr, const char *buf,
size_t count)
{
return sysconfig_bitstream_burst_write(mgr->priv, buf, count);
}
static int sysconfig_ops_write_complete(struct fpga_manager *mgr,
struct fpga_image_info *info)
{
struct sysconfig_priv *priv = mgr->priv;
struct device *dev = &mgr->dev;
int ret;
ret = sysconfig_burst_write_complete(priv);
if (!ret)
ret = sysconfig_poll_busy(priv);
if (ret) {
dev_err(dev, "Error while waiting bitstream write to finish\n");
goto fail;
}
ret = sysconfig_isc_finish(priv);
fail:
if (ret)
sysconfig_cleanup(priv);
return ret;
}
static const struct fpga_manager_ops sysconfig_fpga_mgr_ops = {
.state = sysconfig_ops_state,
.write_init = sysconfig_ops_write_init,
.write = sysconfig_ops_write,
.write_complete = sysconfig_ops_write_complete,
};
int sysconfig_probe(struct sysconfig_priv *priv)
{
struct gpio_desc *program, *init, *done;
struct device *dev = priv->dev;
struct fpga_manager *mgr;
if (!dev)
return -ENODEV;
if (!priv->command_transfer ||
!priv->bitstream_burst_write_init ||
!priv->bitstream_burst_write ||
!priv->bitstream_burst_write_complete) {
dev_err(dev, "Essential callback is missing\n");
return -EINVAL;
}
program = devm_gpiod_get_optional(dev, "program", GPIOD_OUT_LOW);
if (IS_ERR(program))
return dev_err_probe(dev, PTR_ERR(program),
"Failed to get PROGRAM GPIO\n");
init = devm_gpiod_get_optional(dev, "init", GPIOD_IN);
if (IS_ERR(init))
return dev_err_probe(dev, PTR_ERR(init),
"Failed to get INIT GPIO\n");
done = devm_gpiod_get_optional(dev, "done", GPIOD_IN);
if (IS_ERR(done))
return dev_err_probe(dev, PTR_ERR(done),
"Failed to get DONE GPIO\n");
priv->program = program;
priv->init = init;
priv->done = done;
mgr = devm_fpga_mgr_register(dev, "Lattice sysCONFIG FPGA Manager",
&sysconfig_fpga_mgr_ops, priv);
return PTR_ERR_OR_ZERO(mgr);
}
EXPORT_SYMBOL(sysconfig_probe);
MODULE_DESCRIPTION("Lattice sysCONFIG FPGA Manager Core");
MODULE_LICENSE("GPL");
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