* the slave serial configuration interface.
*/
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/fpga/fpga-mgr.h>
-#include <linux/gpio/consumer.h>
+#include "xilinx-core.h"
+
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/of.h>
#include <linux/spi/spi.h>
-#include <linux/sizes.h>
-
-struct xilinx_spi_conf {
- struct spi_device *spi;
- struct gpio_desc *prog_b;
- struct gpio_desc *init_b;
- struct gpio_desc *done;
-};
-
-static int get_done_gpio(struct fpga_manager *mgr)
-{
- struct xilinx_spi_conf *conf = mgr->priv;
- int ret;
-
- ret = gpiod_get_value(conf->done);
-
- if (ret < 0)
- dev_err(&mgr->dev, "Error reading DONE (%d)\n", ret);
-
- return ret;
-}
-
-static enum fpga_mgr_states xilinx_spi_state(struct fpga_manager *mgr)
-{
- if (!get_done_gpio(mgr))
- return FPGA_MGR_STATE_RESET;
-
- return FPGA_MGR_STATE_UNKNOWN;
-}
-
-/**
- * wait_for_init_b - wait for the INIT_B pin to have a given state, or wait
- * a given delay if the pin is unavailable
- *
- * @mgr: The FPGA manager object
- * @value: Value INIT_B to wait for (1 = asserted = low)
- * @alt_udelay: Delay to wait if the INIT_B GPIO is not available
- *
- * Returns 0 when the INIT_B GPIO reached the given state or -ETIMEDOUT if
- * too much time passed waiting for that. If no INIT_B GPIO is available
- * then always return 0.
- */
-static int wait_for_init_b(struct fpga_manager *mgr, int value,
- unsigned long alt_udelay)
-{
- struct xilinx_spi_conf *conf = mgr->priv;
- unsigned long timeout = jiffies + msecs_to_jiffies(1000);
-
- if (conf->init_b) {
- while (time_before(jiffies, timeout)) {
- int ret = gpiod_get_value(conf->init_b);
-
- if (ret == value)
- return 0;
-
- if (ret < 0) {
- dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret);
- return ret;
- }
-
- usleep_range(100, 400);
- }
-
- dev_err(&mgr->dev, "Timeout waiting for INIT_B to %s\n",
- value ? "assert" : "deassert");
- return -ETIMEDOUT;
- }
-
- udelay(alt_udelay);
-
- return 0;
-}
-
-static int xilinx_spi_write_init(struct fpga_manager *mgr,
- struct fpga_image_info *info,
- const char *buf, size_t count)
-{
- struct xilinx_spi_conf *conf = mgr->priv;
- int err;
-
- if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
- dev_err(&mgr->dev, "Partial reconfiguration not supported\n");
- return -EINVAL;
- }
-
- gpiod_set_value(conf->prog_b, 1);
-
- err = wait_for_init_b(mgr, 1, 1); /* min is 500 ns */
- if (err) {
- gpiod_set_value(conf->prog_b, 0);
- return err;
- }
-
- gpiod_set_value(conf->prog_b, 0);
-
- err = wait_for_init_b(mgr, 0, 0);
- if (err)
- return err;
-
- if (get_done_gpio(mgr)) {
- dev_err(&mgr->dev, "Unexpected DONE pin state...\n");
- return -EIO;
- }
- /* program latency */
- usleep_range(7500, 7600);
- return 0;
-}
-
-static int xilinx_spi_write(struct fpga_manager *mgr, const char *buf,
+static int xilinx_spi_write(struct xilinx_fpga_core *core, const char *buf,
size_t count)
{
- struct xilinx_spi_conf *conf = mgr->priv;
+ struct spi_device *spi = to_spi_device(core->dev);
const char *fw_data = buf;
const char *fw_data_end = fw_data + count;
remaining = fw_data_end - fw_data;
stride = min_t(size_t, remaining, SZ_4K);
- ret = spi_write(conf->spi, fw_data, stride);
+ ret = spi_write(spi, fw_data, stride);
if (ret) {
- dev_err(&mgr->dev, "SPI error in firmware write: %d\n",
+ dev_err(core->dev, "SPI error in firmware write: %d\n",
ret);
return ret;
}
return 0;
}
-static int xilinx_spi_apply_cclk_cycles(struct xilinx_spi_conf *conf)
-{
- struct spi_device *spi = conf->spi;
- const u8 din_data[1] = { 0xff };
- int ret;
-
- ret = spi_write(conf->spi, din_data, sizeof(din_data));
- if (ret)
- dev_err(&spi->dev, "applying CCLK cycles failed: %d\n", ret);
-
- return ret;
-}
-
-static int xilinx_spi_write_complete(struct fpga_manager *mgr,
- struct fpga_image_info *info)
-{
- struct xilinx_spi_conf *conf = mgr->priv;
- unsigned long timeout = jiffies + usecs_to_jiffies(info->config_complete_timeout_us);
- bool expired = false;
- int done;
- int ret;
-
- /*
- * This loop is carefully written such that if the driver is
- * scheduled out for more than 'timeout', we still check for DONE
- * before giving up and we apply 8 extra CCLK cycles in all cases.
- */
- while (!expired) {
- expired = time_after(jiffies, timeout);
-
- done = get_done_gpio(mgr);
- if (done < 0)
- return done;
-
- ret = xilinx_spi_apply_cclk_cycles(conf);
- if (ret)
- return ret;
-
- if (done)
- return 0;
- }
-
- if (conf->init_b) {
- ret = gpiod_get_value(conf->init_b);
-
- if (ret < 0) {
- dev_err(&mgr->dev, "Error reading INIT_B (%d)\n", ret);
- return ret;
- }
-
- dev_err(&mgr->dev,
- ret ? "CRC error or invalid device\n"
- : "Missing sync word or incomplete bitstream\n");
- } else {
- dev_err(&mgr->dev, "Timeout after config data transfer\n");
- }
-
- return -ETIMEDOUT;
-}
-
-static const struct fpga_manager_ops xilinx_spi_ops = {
- .state = xilinx_spi_state,
- .write_init = xilinx_spi_write_init,
- .write = xilinx_spi_write,
- .write_complete = xilinx_spi_write_complete,
-};
-
static int xilinx_spi_probe(struct spi_device *spi)
{
- struct xilinx_spi_conf *conf;
- struct fpga_manager *mgr;
+ struct xilinx_fpga_core *core;
- conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL);
- if (!conf)
+ core = devm_kzalloc(&spi->dev, sizeof(*core), GFP_KERNEL);
+ if (!core)
return -ENOMEM;
- conf->spi = spi;
+ core->dev = &spi->dev;
+ core->write = xilinx_spi_write;
- /* PROGRAM_B is active low */
- conf->prog_b = devm_gpiod_get(&spi->dev, "prog_b", GPIOD_OUT_LOW);
- if (IS_ERR(conf->prog_b))
- return dev_err_probe(&spi->dev, PTR_ERR(conf->prog_b),
- "Failed to get PROGRAM_B gpio\n");
-
- conf->init_b = devm_gpiod_get_optional(&spi->dev, "init-b", GPIOD_IN);
- if (IS_ERR(conf->init_b))
- return dev_err_probe(&spi->dev, PTR_ERR(conf->init_b),
- "Failed to get INIT_B gpio\n");
-
- conf->done = devm_gpiod_get(&spi->dev, "done", GPIOD_IN);
- if (IS_ERR(conf->done))
- return dev_err_probe(&spi->dev, PTR_ERR(conf->done),
- "Failed to get DONE gpio\n");
-
- mgr = devm_fpga_mgr_register(&spi->dev,
- "Xilinx Slave Serial FPGA Manager",
- &xilinx_spi_ops, conf);
- return PTR_ERR_OR_ZERO(mgr);
+ return xilinx_core_probe(core);
}
#ifdef CONFIG_OF
static const struct of_device_id xlnx_spi_of_match[] = {
- { .compatible = "xlnx,fpga-slave-serial", },
+ {
+ .compatible = "xlnx,fpga-slave-serial",
+ },
{}
};
MODULE_DEVICE_TABLE(of, xlnx_spi_of_match);
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