153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Lattice FPGA programming over slave SPI sysCONFIG interface.
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*/
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#include <linux/spi/spi.h>
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#include "lattice-sysconfig.h"
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static const u32 ecp5_spi_max_speed_hz = 60000000;
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static int sysconfig_spi_cmd_transfer(struct sysconfig_priv *priv,
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const void *tx_buf, size_t tx_len,
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void *rx_buf, size_t rx_len)
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{
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struct spi_device *spi = to_spi_device(priv->dev);
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return spi_write_then_read(spi, tx_buf, tx_len, rx_buf, rx_len);
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}
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static int sysconfig_spi_bitstream_burst_init(struct sysconfig_priv *priv)
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{
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const u8 lsc_bitstream_burst[] = SYSCONFIG_LSC_BITSTREAM_BURST;
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struct spi_device *spi = to_spi_device(priv->dev);
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struct spi_transfer xfer = {};
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struct spi_message msg;
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size_t buf_len;
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void *buf;
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int ret;
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buf_len = sizeof(lsc_bitstream_burst);
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buf = kmemdup(lsc_bitstream_burst, buf_len, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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xfer.len = buf_len;
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xfer.tx_buf = buf;
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xfer.cs_change = 1;
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spi_message_init_with_transfers(&msg, &xfer, 1);
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/*
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* Lock SPI bus for exclusive usage until FPGA programming is done.
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* SPI bus will be released in sysconfig_spi_bitstream_burst_complete().
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*/
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spi_bus_lock(spi->controller);
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ret = spi_sync_locked(spi, &msg);
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if (ret)
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spi_bus_unlock(spi->controller);
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kfree(buf);
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return ret;
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}
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static int sysconfig_spi_bitstream_burst_write(struct sysconfig_priv *priv,
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const char *buf, size_t len)
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{
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struct spi_device *spi = to_spi_device(priv->dev);
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struct spi_transfer xfer = {
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.tx_buf = buf,
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.len = len,
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.cs_change = 1,
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};
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struct spi_message msg;
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spi_message_init_with_transfers(&msg, &xfer, 1);
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return spi_sync_locked(spi, &msg);
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}
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static int sysconfig_spi_bitstream_burst_complete(struct sysconfig_priv *priv)
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{
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struct spi_device *spi = to_spi_device(priv->dev);
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/* Bitstream burst write is done, release SPI bus */
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spi_bus_unlock(spi->controller);
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/* Toggle CS to finish bitstream write */
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return spi_write(spi, NULL, 0);
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}
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static int sysconfig_spi_probe(struct spi_device *spi)
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{
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const struct spi_device_id *dev_id;
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struct device *dev = &spi->dev;
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struct sysconfig_priv *priv;
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const u32 *spi_max_speed;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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spi_max_speed = device_get_match_data(dev);
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if (!spi_max_speed) {
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dev_id = spi_get_device_id(spi);
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if (!dev_id)
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return -ENODEV;
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spi_max_speed = (const u32 *)dev_id->driver_data;
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}
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if (!spi_max_speed)
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return -EINVAL;
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if (spi->max_speed_hz > *spi_max_speed) {
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dev_err(dev, "SPI speed %u is too high, maximum speed is %u\n",
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spi->max_speed_hz, *spi_max_speed);
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return -EINVAL;
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}
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priv->dev = dev;
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priv->command_transfer = sysconfig_spi_cmd_transfer;
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priv->bitstream_burst_write_init = sysconfig_spi_bitstream_burst_init;
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priv->bitstream_burst_write = sysconfig_spi_bitstream_burst_write;
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priv->bitstream_burst_write_complete = sysconfig_spi_bitstream_burst_complete;
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return sysconfig_probe(priv);
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}
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static const struct spi_device_id sysconfig_spi_ids[] = {
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{
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.name = "sysconfig-ecp5",
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.driver_data = (kernel_ulong_t)&ecp5_spi_max_speed_hz,
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}, {},
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};
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MODULE_DEVICE_TABLE(spi, sysconfig_spi_ids);
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#if IS_ENABLED(CONFIG_OF)
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static const struct of_device_id sysconfig_of_ids[] = {
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{
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.compatible = "lattice,sysconfig-ecp5",
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.data = &ecp5_spi_max_speed_hz,
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}, {},
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};
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MODULE_DEVICE_TABLE(of, sysconfig_of_ids);
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#endif /* IS_ENABLED(CONFIG_OF) */
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static struct spi_driver lattice_sysconfig_driver = {
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.probe = sysconfig_spi_probe,
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.id_table = sysconfig_spi_ids,
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.driver = {
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.name = "lattice_sysconfig_spi_fpga_mgr",
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.of_match_table = of_match_ptr(sysconfig_of_ids),
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},
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};
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module_spi_driver(lattice_sysconfig_driver);
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MODULE_DESCRIPTION("Lattice sysCONFIG Slave SPI FPGA Manager");
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MODULE_LICENSE("GPL");
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