Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/firmware.h>
#include <asm/unaligned.h>

#include "gs_fpgaboot.h"
#include "io.h"

#define DEVICE_NAME "device"
#define CLASS_NAME  "fpgaboot"

static u8 bits_magic[] = {
	0x0, 0x9, 0xf, 0xf0, 0xf, 0xf0,
	0xf, 0xf0, 0xf, 0xf0, 0x0, 0x0, 0x1};

/* fake device for request_firmware */
static struct platform_device	*firmware_pdev;

static char	*file = "xlinx_fpga_firmware.bit";
module_param(file, charp, 0444);
MODULE_PARM_DESC(file, "Xilinx FPGA firmware file.");

static void read_bitstream(u8 *bitdata, u8 *buf, int *offset, int rdsize)
{
	memcpy(buf, bitdata + *offset, rdsize);
	*offset += rdsize;
}

static int readinfo_bitstream(u8 *bitdata, u8 *buf, int size, int *offset)
{
	u8 tbuf[2];
	u16 len;

	/* read section char */
	read_bitstream(bitdata, tbuf, offset, 1);

	/* read length */
	read_bitstream(bitdata, tbuf, offset, 2);

	len = get_unaligned_be16(tbuf);
	if (len >= size) {
		pr_err("error: readinfo buffer too small\n");
		return -EINVAL;
	}

	read_bitstream(bitdata, buf, offset, len);
	buf[len] = '\0';

	return 0;
}

/*
 * read bitdata length
 */
static int readlength_bitstream(u8 *bitdata, int *lendata, int *offset)
{
	u8 tbuf[4];

	/* read section char */
	read_bitstream(bitdata, tbuf, offset, 1);

	/* make sure it is section 'e' */
	if (tbuf[0] != 'e') {
		pr_err("error: length section is not 'e', but %c\n", tbuf[0]);
		return -EINVAL;
	}

	/* read 4bytes length */
	read_bitstream(bitdata, tbuf, offset, 4);

	*lendata = get_unaligned_be32(tbuf);

	return 0;
}

/*
 * read first 13 bytes to check bitstream magic number
 */
static int readmagic_bitstream(u8 *bitdata, int *offset)
{
	u8 buf[13];
	int r;

	read_bitstream(bitdata, buf, offset, 13);
	r = memcmp(buf, bits_magic, 13);
	if (r) {
		pr_err("error: corrupted header");
		return -EINVAL;
	}
	pr_info("bitstream file magic number Ok\n");

	*offset = 13;	/* magic length */

	return 0;
}

/*
 * NOTE: supports only bitstream format
 */
static enum fmt_image get_imageformat(void)
{
	return f_bit;
}

static void gs_print_header(struct fpgaimage *fimage)
{
	pr_info("file: %s\n", fimage->filename);
	pr_info("part: %s\n", fimage->part);
	pr_info("date: %s\n", fimage->date);
	pr_info("time: %s\n", fimage->time);
	pr_info("lendata: %d\n", fimage->lendata);
}

static int gs_read_bitstream(struct fpgaimage *fimage)
{
	u8 *bitdata;
	int offset;
	int err;

	offset = 0;
	bitdata = (u8 *)fimage->fw_entry->data;

	err = readmagic_bitstream(bitdata, &offset);
	if (err)
		return err;

	err = readinfo_bitstream(bitdata, fimage->filename, MAX_STR, &offset);
	if (err)
		return err;
	err = readinfo_bitstream(bitdata, fimage->part, MAX_STR, &offset);
	if (err)
		return err;
	err = readinfo_bitstream(bitdata, fimage->date, MAX_STR, &offset);
	if (err)
		return err;
	err = readinfo_bitstream(bitdata, fimage->time, MAX_STR, &offset);
	if (err)
		return err;

	err = readlength_bitstream(bitdata, &fimage->lendata, &offset);
	if (err)
		return err;

	fimage->fpgadata = bitdata + offset;

	return 0;
}

static int gs_read_image(struct fpgaimage *fimage)
{
	int img_fmt;
	int err;

	img_fmt = get_imageformat();

	switch (img_fmt) {
	case f_bit:
		pr_info("image is bitstream format\n");
		err = gs_read_bitstream(fimage);
		if (err)
			return err;
		break;
	default:
		pr_err("unsupported fpga image format\n");
		return -EINVAL;
	}

	gs_print_header(fimage);

	return 0;
}

static int gs_load_image(struct fpgaimage *fimage, char *fw_file)
{
	int err;

	pr_info("load fpgaimage %s\n", fw_file);

	err = request_firmware(&fimage->fw_entry, fw_file, &firmware_pdev->dev);
	if (err != 0) {
		pr_err("firmware %s is missing, cannot continue.\n", fw_file);
		return err;
	}

	return 0;
}

static int gs_download_image(struct fpgaimage *fimage, enum wbus bus_bytes)
{
	u8 *bitdata;
	int size, i, cnt;

	cnt = 0;
	bitdata = (u8 *)fimage->fpgadata;
	size = fimage->lendata;

#ifdef DEBUG_FPGA
	print_hex_dump_bytes("bitfile sample: ", DUMP_PREFIX_OFFSET,
			     bitdata, 0x100);
#endif /* DEBUG_FPGA */
	if (!xl_supported_prog_bus_width(bus_bytes)) {
		pr_err("unsupported program bus width %d\n",
		       bus_bytes);
		return -EINVAL;
	}

	/* Bring csi_b, rdwr_b Low and program_b High */
	xl_program_b(1);
	xl_rdwr_b(0);
	xl_csi_b(0);

	/* Configuration reset */
	xl_program_b(0);
	msleep(20);
	xl_program_b(1);

	/* Wait for Device Initialization */
	while (xl_get_init_b() == 0)
		;

	pr_info("device init done\n");

	for (i = 0; i < size; i += bus_bytes)
		xl_shift_bytes_out(bus_bytes, bitdata + i);

	pr_info("program done\n");

	/* Check INIT_B */
	if (xl_get_init_b() == 0) {
		pr_err("init_b 0\n");
		return -EIO;
	}

	while (xl_get_done_b() == 0) {
		if (cnt++ > MAX_WAIT_DONE) {
			pr_err("init_B %d\n", xl_get_init_b());
			break;
		}
	}

	if (cnt > MAX_WAIT_DONE) {
		pr_err("fpga download fail\n");
		return -EIO;
	}

	pr_info("download fpgaimage\n");

	/* Compensate for Special Startup Conditions */
	xl_shift_cclk(8);

	return 0;
}

static int gs_release_image(struct fpgaimage *fimage)
{
	release_firmware(fimage->fw_entry);
	pr_info("release fpgaimage\n");

	return 0;
}

/*
 * NOTE: supports systemmap parallel programming
 */
static int gs_set_download_method(struct fpgaimage *fimage)
{
	pr_info("set program method\n");

	fimage->dmethod = m_systemmap;

	pr_info("systemmap program method\n");

	return 0;
}

static int init_driver(void)
{
	firmware_pdev = platform_device_register_simple("fpgaboot", -1,
							NULL, 0);
	return PTR_ERR_OR_ZERO(firmware_pdev);
}

static int gs_fpgaboot(void)
{
	int err;
	struct fpgaimage	*fimage;

	fimage = kmalloc(sizeof(*fimage), GFP_KERNEL);
	if (!fimage)
		return -ENOMEM;

	err = gs_load_image(fimage, file);
	if (err) {
		pr_err("gs_load_image error\n");
		goto err_out1;
	}

	err = gs_read_image(fimage);
	if (err) {
		pr_err("gs_read_image error\n");
		goto err_out2;
	}

	err = gs_set_download_method(fimage);
	if (err) {
		pr_err("gs_set_download_method error\n");
		goto err_out2;
	}

	err = gs_download_image(fimage, bus_2byte);
	if (err) {
		pr_err("gs_download_image error\n");
		goto err_out2;
	}

	err = gs_release_image(fimage);
	if (err) {
		pr_err("gs_release_image error\n");
		goto err_out1;
	}

	kfree(fimage);
	return 0;

err_out2:
	err = gs_release_image(fimage);
	if (err)
		pr_err("gs_release_image error\n");
err_out1:
	kfree(fimage);

	return err;
}

static int __init gs_fpgaboot_init(void)
{
	int err;

	pr_info("FPGA DOWNLOAD --->\n");

	pr_info("FPGA image file name: %s\n", file);

	err = init_driver();
	if (err) {
		pr_err("FPGA DRIVER INIT FAIL!!\n");
		return err;
	}

	err = xl_init_io();
	if (err) {
		pr_err("GPIO INIT FAIL!!\n");
		goto errout;
	}

	err = gs_fpgaboot();
	if (err) {
		pr_err("FPGA DOWNLOAD FAIL!!\n");
		goto errout;
	}

	pr_info("FPGA DOWNLOAD DONE <---\n");

	return 0;

errout:
	platform_device_unregister(firmware_pdev);

	return err;
}

static void __exit gs_fpgaboot_exit(void)
{
	platform_device_unregister(firmware_pdev);
	pr_info("FPGA image download module removed\n");
}

module_init(gs_fpgaboot_init);
module_exit(gs_fpgaboot_exit);

MODULE_AUTHOR("Insop Song");
MODULE_DESCRIPTION("Xlinix FPGA firmware download");
MODULE_LICENSE("GPL");