1 // SPDX-License-Identifier: GPL-2.0
3  * Lattice FPGA programming over slave SPI sysCONFIG interface.
7 #include <linux/spi/spi.h>
9 #include "lattice-sysconfig.h"
17 	struct spi_device *spi = to_spi_device(priv->dev);  in sysconfig_spi_cmd_transfer()  local
19 	return spi_write_then_read(spi, tx_buf, tx_len, rx_buf, rx_len);  in sysconfig_spi_cmd_transfer()
25 	struct spi_device *spi = to_spi_device(priv->dev);  in sysconfig_spi_bitstream_burst_init()  local
36 		return -ENOMEM;  in sysconfig_spi_bitstream_burst_init()
45 	 * Lock SPI bus for exclusive usage until FPGA programming is done.  in sysconfig_spi_bitstream_burst_init()
46 	 * SPI bus will be released in sysconfig_spi_bitstream_burst_complete().  in sysconfig_spi_bitstream_burst_init()
48 	spi_bus_lock(spi->controller);  in sysconfig_spi_bitstream_burst_init()
50 	ret = spi_sync_locked(spi, &msg);  in sysconfig_spi_bitstream_burst_init()
52 		spi_bus_unlock(spi->controller);  in sysconfig_spi_bitstream_burst_init()
62 	struct spi_device *spi = to_spi_device(priv->dev);  in sysconfig_spi_bitstream_burst_write()  local
72 	return spi_sync_locked(spi, &msg);  in sysconfig_spi_bitstream_burst_write()
77 	struct spi_device *spi = to_spi_device(priv->dev);  in sysconfig_spi_bitstream_burst_complete()  local
79 	/* Bitstream burst write is done, release SPI bus */  in sysconfig_spi_bitstream_burst_complete()
80 	spi_bus_unlock(spi->controller);  in sysconfig_spi_bitstream_burst_complete()
83 	return spi_write(spi, NULL, 0);  in sysconfig_spi_bitstream_burst_complete()
86 static int sysconfig_spi_probe(struct spi_device *spi)  in sysconfig_spi_probe()  argument
89 	struct device *dev = &spi->dev;  in sysconfig_spi_probe()
95 		return -ENOMEM;  in sysconfig_spi_probe()
99 		dev_id = spi_get_device_id(spi);  in sysconfig_spi_probe()
101 			return -ENODEV;  in sysconfig_spi_probe()
103 		spi_max_speed = (const u32 *)dev_id->driver_data;  in sysconfig_spi_probe()
107 		return -EINVAL;  in sysconfig_spi_probe()
109 	if (spi->max_speed_hz > *spi_max_speed) {  in sysconfig_spi_probe()
110 		dev_err(dev, "SPI speed %u is too high, maximum speed is %u\n",  in sysconfig_spi_probe()
111 			spi->max_speed_hz, *spi_max_speed);  in sysconfig_spi_probe()
112 		return -EINVAL;  in sysconfig_spi_probe()
115 	priv->dev = dev;  in sysconfig_spi_probe()
116 	priv->command_transfer = sysconfig_spi_cmd_transfer;  in sysconfig_spi_probe()
117 	priv->bitstream_burst_write_init = sysconfig_spi_bitstream_burst_init;  in sysconfig_spi_probe()
118 	priv->bitstream_burst_write = sysconfig_spi_bitstream_burst_write;  in sysconfig_spi_probe()
119 	priv->bitstream_burst_write_complete = sysconfig_spi_bitstream_burst_complete;  in sysconfig_spi_probe()
126 		.name = "sysconfig-ecp5",
130 MODULE_DEVICE_TABLE(spi, sysconfig_spi_ids);
135 		.compatible = "lattice,sysconfig-ecp5",
152 MODULE_DESCRIPTION("Lattice sysCONFIG Slave SPI FPGA Manager");