250 lines
5.9 KiB
C
250 lines
5.9 KiB
C
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/*
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* Copyright (C) 2012 Stefan Roese <sr@denx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/firmware.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <asm/unaligned.h>
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#define FIRMWARE_NAME "lattice-ecp3.bit"
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/*
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* The JTAG ID's of the supported FPGA's. The ID is 32bit wide
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* reversed as noted in the manual.
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*/
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#define ID_ECP3_17 0xc2088080
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#define ID_ECP3_35 0xc2048080
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/* FPGA commands */
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#define FPGA_CMD_READ_ID 0x07 /* plus 24 bits */
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#define FPGA_CMD_READ_STATUS 0x09 /* plus 24 bits */
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#define FPGA_CMD_CLEAR 0x70
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#define FPGA_CMD_REFRESH 0x71
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#define FPGA_CMD_WRITE_EN 0x4a /* plus 2 bits */
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#define FPGA_CMD_WRITE_DIS 0x4f /* plus 8 bits */
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#define FPGA_CMD_WRITE_INC 0x41 /* plus 0 bits */
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/*
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* The status register is 32bit revered, DONE is bit 17 from the TN1222.pdf
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* (LatticeECP3 Slave SPI Port User's Guide)
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*/
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#define FPGA_STATUS_DONE 0x00004000
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#define FPGA_STATUS_CLEARED 0x00010000
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#define FPGA_CLEAR_TIMEOUT 5000 /* max. 5000ms for FPGA clear */
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#define FPGA_CLEAR_MSLEEP 10
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#define FPGA_CLEAR_LOOP_COUNT (FPGA_CLEAR_TIMEOUT / FPGA_CLEAR_MSLEEP)
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struct fpga_data {
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struct completion fw_loaded;
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};
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struct ecp3_dev {
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u32 jedec_id;
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char *name;
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};
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static const struct ecp3_dev ecp3_dev[] = {
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{
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.jedec_id = ID_ECP3_17,
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.name = "Lattice ECP3-17",
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},
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{
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.jedec_id = ID_ECP3_35,
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.name = "Lattice ECP3-35",
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},
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};
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static void firmware_load(const struct firmware *fw, void *context)
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{
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struct spi_device *spi = (struct spi_device *)context;
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struct fpga_data *data = spi_get_drvdata(spi);
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u8 *buffer;
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int ret;
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u8 txbuf[8];
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u8 rxbuf[8];
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int rx_len = 8;
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int i;
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u32 jedec_id;
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u32 status;
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if (fw == NULL) {
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dev_err(&spi->dev, "Cannot load firmware, aborting\n");
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return;
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}
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if (fw->size == 0) {
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dev_err(&spi->dev, "Error: Firmware size is 0!\n");
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return;
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}
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/* Fill dummy data (24 stuffing bits for commands) */
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txbuf[1] = 0x00;
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txbuf[2] = 0x00;
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txbuf[3] = 0x00;
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/* Trying to speak with the FPGA via SPI... */
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txbuf[0] = FPGA_CMD_READ_ID;
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ret = spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
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jedec_id = get_unaligned_be32(&rxbuf[4]);
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dev_dbg(&spi->dev, "FPGA JTAG ID=%08x\n", jedec_id);
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for (i = 0; i < ARRAY_SIZE(ecp3_dev); i++) {
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if (jedec_id == ecp3_dev[i].jedec_id)
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break;
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}
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if (i == ARRAY_SIZE(ecp3_dev)) {
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dev_err(&spi->dev,
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"Error: No supported FPGA detected (JEDEC_ID=%08x)!\n",
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jedec_id);
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return;
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}
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dev_info(&spi->dev, "FPGA %s detected\n", ecp3_dev[i].name);
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txbuf[0] = FPGA_CMD_READ_STATUS;
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ret = spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
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status = get_unaligned_be32(&rxbuf[4]);
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dev_dbg(&spi->dev, "FPGA Status=%08x\n", status);
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buffer = kzalloc(fw->size + 8, GFP_KERNEL);
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if (!buffer) {
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dev_err(&spi->dev, "Error: Can't allocate memory!\n");
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return;
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}
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/*
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* Insert WRITE_INC command into stream (one SPI frame)
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*/
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buffer[0] = FPGA_CMD_WRITE_INC;
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buffer[1] = 0xff;
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buffer[2] = 0xff;
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buffer[3] = 0xff;
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memcpy(buffer + 4, fw->data, fw->size);
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txbuf[0] = FPGA_CMD_REFRESH;
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ret = spi_write(spi, txbuf, 4);
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txbuf[0] = FPGA_CMD_WRITE_EN;
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ret = spi_write(spi, txbuf, 4);
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txbuf[0] = FPGA_CMD_CLEAR;
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ret = spi_write(spi, txbuf, 4);
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/*
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* Wait for FPGA memory to become cleared
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*/
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for (i = 0; i < FPGA_CLEAR_LOOP_COUNT; i++) {
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txbuf[0] = FPGA_CMD_READ_STATUS;
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ret = spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
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status = get_unaligned_be32(&rxbuf[4]);
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if (status == FPGA_STATUS_CLEARED)
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break;
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msleep(FPGA_CLEAR_MSLEEP);
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}
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if (i == FPGA_CLEAR_LOOP_COUNT) {
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dev_err(&spi->dev,
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"Error: Timeout waiting for FPGA to clear (status=%08x)!\n",
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status);
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kfree(buffer);
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return;
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}
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dev_info(&spi->dev, "Configuring the FPGA...\n");
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ret = spi_write(spi, buffer, fw->size + 8);
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txbuf[0] = FPGA_CMD_WRITE_DIS;
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ret = spi_write(spi, txbuf, 4);
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txbuf[0] = FPGA_CMD_READ_STATUS;
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ret = spi_write_then_read(spi, txbuf, 8, rxbuf, rx_len);
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status = get_unaligned_be32(&rxbuf[4]);
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dev_dbg(&spi->dev, "FPGA Status=%08x\n", status);
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/* Check result */
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if (status & FPGA_STATUS_DONE)
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dev_info(&spi->dev, "FPGA successfully configured!\n");
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else
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dev_info(&spi->dev, "FPGA not configured (DONE not set)\n");
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/*
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* Don't forget to release the firmware again
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*/
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release_firmware(fw);
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kfree(buffer);
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complete(&data->fw_loaded);
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}
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static int lattice_ecp3_probe(struct spi_device *spi)
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{
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struct fpga_data *data;
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int err;
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data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);
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if (!data) {
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dev_err(&spi->dev, "Memory allocation for fpga_data failed\n");
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return -ENOMEM;
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}
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spi_set_drvdata(spi, data);
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init_completion(&data->fw_loaded);
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err = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
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FIRMWARE_NAME, &spi->dev,
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GFP_KERNEL, spi, firmware_load);
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if (err) {
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dev_err(&spi->dev, "Firmware loading failed with %d!\n", err);
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return err;
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}
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dev_info(&spi->dev, "FPGA bitstream configuration driver registered\n");
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return 0;
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}
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static int lattice_ecp3_remove(struct spi_device *spi)
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{
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struct fpga_data *data = spi_get_drvdata(spi);
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wait_for_completion(&data->fw_loaded);
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return 0;
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}
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static const struct spi_device_id lattice_ecp3_id[] = {
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{ "ecp3-17", 0 },
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{ "ecp3-35", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, lattice_ecp3_id);
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static struct spi_driver lattice_ecp3_driver = {
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.driver = {
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.name = "lattice-ecp3",
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},
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.probe = lattice_ecp3_probe,
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.remove = lattice_ecp3_remove,
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.id_table = lattice_ecp3_id,
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};
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module_spi_driver(lattice_ecp3_driver);
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MODULE_AUTHOR("Stefan Roese <sr@denx.de>");
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MODULE_DESCRIPTION("Lattice ECP3 FPGA configuration via SPI");
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MODULE_LICENSE("GPL");
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MODULE_FIRMWARE(FIRMWARE_NAME);
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