Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2011-2015 Xilinx Inc.
4 * Copyright (c) 2015, National Instruments Corp.
5 *
6 * FPGA Manager Driver for Xilinx Zynq, heavily based on xdevcfg driver
7 * in their vendor tree.
8 */
9
10#include <linux/clk.h>
11#include <linux/completion.h>
12#include <linux/delay.h>
13#include <linux/dma-mapping.h>
14#include <linux/fpga/fpga-mgr.h>
15#include <linux/interrupt.h>
16#include <linux/io.h>
17#include <linux/iopoll.h>
18#include <linux/module.h>
19#include <linux/mfd/syscon.h>
20#include <linux/of_address.h>
21#include <linux/of_irq.h>
22#include <linux/pm.h>
23#include <linux/regmap.h>
24#include <linux/string.h>
25#include <linux/scatterlist.h>
26
27/* Offsets into SLCR regmap */
28
29/* FPGA Software Reset Control */
30#define SLCR_FPGA_RST_CTRL_OFFSET 0x240
31/* Level Shifters Enable */
32#define SLCR_LVL_SHFTR_EN_OFFSET 0x900
33
34/* Constant Definitions */
35
36/* Control Register */
37#define CTRL_OFFSET 0x00
38/* Lock Register */
39#define LOCK_OFFSET 0x04
40/* Interrupt Status Register */
41#define INT_STS_OFFSET 0x0c
42/* Interrupt Mask Register */
43#define INT_MASK_OFFSET 0x10
44/* Status Register */
45#define STATUS_OFFSET 0x14
46/* DMA Source Address Register */
47#define DMA_SRC_ADDR_OFFSET 0x18
48/* DMA Destination Address Reg */
49#define DMA_DST_ADDR_OFFSET 0x1c
50/* DMA Source Transfer Length */
51#define DMA_SRC_LEN_OFFSET 0x20
52/* DMA Destination Transfer */
53#define DMA_DEST_LEN_OFFSET 0x24
54/* Unlock Register */
55#define UNLOCK_OFFSET 0x34
56/* Misc. Control Register */
57#define MCTRL_OFFSET 0x80
58
59/* Control Register Bit definitions */
60
61/* Signal to reset FPGA */
62#define CTRL_PCFG_PROG_B_MASK BIT(30)
63/* Enable PCAP for PR */
64#define CTRL_PCAP_PR_MASK BIT(27)
65/* Enable PCAP */
66#define CTRL_PCAP_MODE_MASK BIT(26)
67/* Lower rate to allow decrypt on the fly */
68#define CTRL_PCAP_RATE_EN_MASK BIT(25)
69/* System booted in secure mode */
70#define CTRL_SEC_EN_MASK BIT(7)
71
72/* Miscellaneous Control Register bit definitions */
73/* Internal PCAP loopback */
74#define MCTRL_PCAP_LPBK_MASK BIT(4)
75
76/* Status register bit definitions */
77
78/* FPGA init status */
79#define STATUS_DMA_Q_F BIT(31)
80#define STATUS_DMA_Q_E BIT(30)
81#define STATUS_PCFG_INIT_MASK BIT(4)
82
83/* Interrupt Status/Mask Register Bit definitions */
84/* DMA command done */
85#define IXR_DMA_DONE_MASK BIT(13)
86/* DMA and PCAP cmd done */
87#define IXR_D_P_DONE_MASK BIT(12)
88 /* FPGA programmed */
89#define IXR_PCFG_DONE_MASK BIT(2)
90#define IXR_ERROR_FLAGS_MASK 0x00F0C860
91#define IXR_ALL_MASK 0xF8F7F87F
92
93/* Miscellaneous constant values */
94
95/* Invalid DMA addr */
96#define DMA_INVALID_ADDRESS GENMASK(31, 0)
97/* Used to unlock the dev */
98#define UNLOCK_MASK 0x757bdf0d
99/* Timeout for polling reset bits */
100#define INIT_POLL_TIMEOUT 2500000
101/* Delay for polling reset bits */
102#define INIT_POLL_DELAY 20
103/* Signal this is the last DMA transfer, wait for the AXI and PCAP before
104 * interrupting
105 */
106#define DMA_SRC_LAST_TRANSFER 1
107/* Timeout for DMA completion */
108#define DMA_TIMEOUT_MS 5000
109
110/* Masks for controlling stuff in SLCR */
111/* Disable all Level shifters */
112#define LVL_SHFTR_DISABLE_ALL_MASK 0x0
113/* Enable Level shifters from PS to PL */
114#define LVL_SHFTR_ENABLE_PS_TO_PL 0xa
115/* Enable Level shifters from PL to PS */
116#define LVL_SHFTR_ENABLE_PL_TO_PS 0xf
117/* Enable global resets */
118#define FPGA_RST_ALL_MASK 0xf
119/* Disable global resets */
120#define FPGA_RST_NONE_MASK 0x0
121
122struct zynq_fpga_priv {
123 int irq;
124 struct clk *clk;
125
126 void __iomem *io_base;
127 struct regmap *slcr;
128
129 spinlock_t dma_lock;
130 unsigned int dma_elm;
131 unsigned int dma_nelms;
132 struct scatterlist *cur_sg;
133
134 struct completion dma_done;
135};
136
137static inline void zynq_fpga_write(struct zynq_fpga_priv *priv, u32 offset,
138 u32 val)
139{
140 writel(val, priv->io_base + offset);
141}
142
143static inline u32 zynq_fpga_read(const struct zynq_fpga_priv *priv,
144 u32 offset)
145{
146 return readl(priv->io_base + offset);
147}
148
149#define zynq_fpga_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \
150 readl_poll_timeout(priv->io_base + addr, val, cond, sleep_us, \
151 timeout_us)
152
153/* Cause the specified irq mask bits to generate IRQs */
154static inline void zynq_fpga_set_irq(struct zynq_fpga_priv *priv, u32 enable)
155{
156 zynq_fpga_write(priv, INT_MASK_OFFSET, ~enable);
157}
158
159/* Must be called with dma_lock held */
160static void zynq_step_dma(struct zynq_fpga_priv *priv)
161{
162 u32 addr;
163 u32 len;
164 bool first;
165
166 first = priv->dma_elm == 0;
167 while (priv->cur_sg) {
168 /* Feed the DMA queue until it is full. */
169 if (zynq_fpga_read(priv, STATUS_OFFSET) & STATUS_DMA_Q_F)
170 break;
171
172 addr = sg_dma_address(priv->cur_sg);
173 len = sg_dma_len(priv->cur_sg);
174 if (priv->dma_elm + 1 == priv->dma_nelms) {
175 /* The last transfer waits for the PCAP to finish too,
176 * notice this also changes the irq_mask to ignore
177 * IXR_DMA_DONE_MASK which ensures we do not trigger
178 * the completion too early.
179 */
180 addr |= DMA_SRC_LAST_TRANSFER;
181 priv->cur_sg = NULL;
182 } else {
183 priv->cur_sg = sg_next(priv->cur_sg);
184 priv->dma_elm++;
185 }
186
187 zynq_fpga_write(priv, DMA_SRC_ADDR_OFFSET, addr);
188 zynq_fpga_write(priv, DMA_DST_ADDR_OFFSET, DMA_INVALID_ADDRESS);
189 zynq_fpga_write(priv, DMA_SRC_LEN_OFFSET, len / 4);
190 zynq_fpga_write(priv, DMA_DEST_LEN_OFFSET, 0);
191 }
192
193 /* Once the first transfer is queued we can turn on the ISR, future
194 * calls to zynq_step_dma will happen from the ISR context. The
195 * dma_lock spinlock guarantees this handover is done coherently, the
196 * ISR enable is put at the end to avoid another CPU spinning in the
197 * ISR on this lock.
198 */
199 if (first && priv->cur_sg) {
200 zynq_fpga_set_irq(priv,
201 IXR_DMA_DONE_MASK | IXR_ERROR_FLAGS_MASK);
202 } else if (!priv->cur_sg) {
203 /* The last transfer changes to DMA & PCAP mode since we do
204 * not want to continue until everything has been flushed into
205 * the PCAP.
206 */
207 zynq_fpga_set_irq(priv,
208 IXR_D_P_DONE_MASK | IXR_ERROR_FLAGS_MASK);
209 }
210}
211
212static irqreturn_t zynq_fpga_isr(int irq, void *data)
213{
214 struct zynq_fpga_priv *priv = data;
215 u32 intr_status;
216
217 /* If anything other than DMA completion is reported stop and hand
218 * control back to zynq_fpga_ops_write, something went wrong,
219 * otherwise progress the DMA.
220 */
221 spin_lock(&priv->dma_lock);
222 intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
223 if (!(intr_status & IXR_ERROR_FLAGS_MASK) &&
224 (intr_status & IXR_DMA_DONE_MASK) && priv->cur_sg) {
225 zynq_fpga_write(priv, INT_STS_OFFSET, IXR_DMA_DONE_MASK);
226 zynq_step_dma(priv);
227 spin_unlock(&priv->dma_lock);
228 return IRQ_HANDLED;
229 }
230 spin_unlock(&priv->dma_lock);
231
232 zynq_fpga_set_irq(priv, 0);
233 complete(&priv->dma_done);
234
235 return IRQ_HANDLED;
236}
237
238/* Sanity check the proposed bitstream. It must start with the sync word in
239 * the correct byte order, and be dword aligned. The input is a Xilinx .bin
240 * file with every 32 bit quantity swapped.
241 */
242static bool zynq_fpga_has_sync(const u8 *buf, size_t count)
243{
244 for (; count >= 4; buf += 4, count -= 4)
245 if (buf[0] == 0x66 && buf[1] == 0x55 && buf[2] == 0x99 &&
246 buf[3] == 0xaa)
247 return true;
248 return false;
249}
250
251static int zynq_fpga_ops_write_init(struct fpga_manager *mgr,
252 struct fpga_image_info *info,
253 const char *buf, size_t count)
254{
255 struct zynq_fpga_priv *priv;
256 u32 ctrl, status;
257 int err;
258
259 priv = mgr->priv;
260
261 err = clk_enable(priv->clk);
262 if (err)
263 return err;
264
265 /* check if bitstream is encrypted & and system's still secure */
266 if (info->flags & FPGA_MGR_ENCRYPTED_BITSTREAM) {
267 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
268 if (!(ctrl & CTRL_SEC_EN_MASK)) {
269 dev_err(&mgr->dev,
270 "System not secure, can't use encrypted bitstreams\n");
271 err = -EINVAL;
272 goto out_err;
273 }
274 }
275
276 /* don't globally reset PL if we're doing partial reconfig */
277 if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {
278 if (!zynq_fpga_has_sync(buf, count)) {
279 dev_err(&mgr->dev,
280 "Invalid bitstream, could not find a sync word. Bitstream must be a byte swapped .bin file\n");
281 err = -EINVAL;
282 goto out_err;
283 }
284
285 /* assert AXI interface resets */
286 regmap_write(priv->slcr, SLCR_FPGA_RST_CTRL_OFFSET,
287 FPGA_RST_ALL_MASK);
288
289 /* disable all level shifters */
290 regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET,
291 LVL_SHFTR_DISABLE_ALL_MASK);
292 /* enable level shifters from PS to PL */
293 regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET,
294 LVL_SHFTR_ENABLE_PS_TO_PL);
295
296 /* create a rising edge on PCFG_INIT. PCFG_INIT follows
297 * PCFG_PROG_B, so we need to poll it after setting PCFG_PROG_B
298 * to make sure the rising edge actually happens.
299 * Note: PCFG_PROG_B is low active, sequence as described in
300 * UG585 v1.10 page 211
301 */
302 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
303 ctrl |= CTRL_PCFG_PROG_B_MASK;
304
305 zynq_fpga_write(priv, CTRL_OFFSET, ctrl);
306
307 err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status,
308 status & STATUS_PCFG_INIT_MASK,
309 INIT_POLL_DELAY,
310 INIT_POLL_TIMEOUT);
311 if (err) {
312 dev_err(&mgr->dev, "Timeout waiting for PCFG_INIT\n");
313 goto out_err;
314 }
315
316 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
317 ctrl &= ~CTRL_PCFG_PROG_B_MASK;
318
319 zynq_fpga_write(priv, CTRL_OFFSET, ctrl);
320
321 err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status,
322 !(status & STATUS_PCFG_INIT_MASK),
323 INIT_POLL_DELAY,
324 INIT_POLL_TIMEOUT);
325 if (err) {
326 dev_err(&mgr->dev, "Timeout waiting for !PCFG_INIT\n");
327 goto out_err;
328 }
329
330 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
331 ctrl |= CTRL_PCFG_PROG_B_MASK;
332
333 zynq_fpga_write(priv, CTRL_OFFSET, ctrl);
334
335 err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status,
336 status & STATUS_PCFG_INIT_MASK,
337 INIT_POLL_DELAY,
338 INIT_POLL_TIMEOUT);
339 if (err) {
340 dev_err(&mgr->dev, "Timeout waiting for PCFG_INIT\n");
341 goto out_err;
342 }
343 }
344
345 /* set configuration register with following options:
346 * - enable PCAP interface
347 * - set throughput for maximum speed (if bistream not encrypted)
348 * - set CPU in user mode
349 */
350 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
351 if (info->flags & FPGA_MGR_ENCRYPTED_BITSTREAM)
352 zynq_fpga_write(priv, CTRL_OFFSET,
353 (CTRL_PCAP_PR_MASK | CTRL_PCAP_MODE_MASK
354 | CTRL_PCAP_RATE_EN_MASK | ctrl));
355 else
356 zynq_fpga_write(priv, CTRL_OFFSET,
357 (CTRL_PCAP_PR_MASK | CTRL_PCAP_MODE_MASK
358 | ctrl));
359
360
361 /* We expect that the command queue is empty right now. */
362 status = zynq_fpga_read(priv, STATUS_OFFSET);
363 if ((status & STATUS_DMA_Q_F) ||
364 (status & STATUS_DMA_Q_E) != STATUS_DMA_Q_E) {
365 dev_err(&mgr->dev, "DMA command queue not right\n");
366 err = -EBUSY;
367 goto out_err;
368 }
369
370 /* ensure internal PCAP loopback is disabled */
371 ctrl = zynq_fpga_read(priv, MCTRL_OFFSET);
372 zynq_fpga_write(priv, MCTRL_OFFSET, (~MCTRL_PCAP_LPBK_MASK & ctrl));
373
374 clk_disable(priv->clk);
375
376 return 0;
377
378out_err:
379 clk_disable(priv->clk);
380
381 return err;
382}
383
384static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt)
385{
386 struct zynq_fpga_priv *priv;
387 const char *why;
388 int err;
389 u32 intr_status;
390 unsigned long timeout;
391 unsigned long flags;
392 struct scatterlist *sg;
393 int i;
394
395 priv = mgr->priv;
396
397 /* The hardware can only DMA multiples of 4 bytes, and it requires the
398 * starting addresses to be aligned to 64 bits (UG585 pg 212).
399 */
400 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
401 if ((sg->offset % 8) || (sg->length % 4)) {
402 dev_err(&mgr->dev,
403 "Invalid bitstream, chunks must be aligned\n");
404 return -EINVAL;
405 }
406 }
407
408 priv->dma_nelms =
409 dma_map_sg(mgr->dev.parent, sgt->sgl, sgt->nents, DMA_TO_DEVICE);
410 if (priv->dma_nelms == 0) {
411 dev_err(&mgr->dev, "Unable to DMA map (TO_DEVICE)\n");
412 return -ENOMEM;
413 }
414
415 /* enable clock */
416 err = clk_enable(priv->clk);
417 if (err)
418 goto out_free;
419
420 zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK);
421 reinit_completion(&priv->dma_done);
422
423 /* zynq_step_dma will turn on interrupts */
424 spin_lock_irqsave(&priv->dma_lock, flags);
425 priv->dma_elm = 0;
426 priv->cur_sg = sgt->sgl;
427 zynq_step_dma(priv);
428 spin_unlock_irqrestore(&priv->dma_lock, flags);
429
430 timeout = wait_for_completion_timeout(&priv->dma_done,
431 msecs_to_jiffies(DMA_TIMEOUT_MS));
432
433 spin_lock_irqsave(&priv->dma_lock, flags);
434 zynq_fpga_set_irq(priv, 0);
435 priv->cur_sg = NULL;
436 spin_unlock_irqrestore(&priv->dma_lock, flags);
437
438 intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
439 zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK);
440
441 /* There doesn't seem to be a way to force cancel any DMA, so if
442 * something went wrong we are relying on the hardware to have halted
443 * the DMA before we get here, if there was we could use
444 * wait_for_completion_interruptible too.
445 */
446
447 if (intr_status & IXR_ERROR_FLAGS_MASK) {
448 why = "DMA reported error";
449 err = -EIO;
450 goto out_report;
451 }
452
453 if (priv->cur_sg ||
454 !((intr_status & IXR_D_P_DONE_MASK) == IXR_D_P_DONE_MASK)) {
455 if (timeout == 0)
456 why = "DMA timed out";
457 else
458 why = "DMA did not complete";
459 err = -EIO;
460 goto out_report;
461 }
462
463 err = 0;
464 goto out_clk;
465
466out_report:
467 dev_err(&mgr->dev,
468 "%s: INT_STS:0x%x CTRL:0x%x LOCK:0x%x INT_MASK:0x%x STATUS:0x%x MCTRL:0x%x\n",
469 why,
470 intr_status,
471 zynq_fpga_read(priv, CTRL_OFFSET),
472 zynq_fpga_read(priv, LOCK_OFFSET),
473 zynq_fpga_read(priv, INT_MASK_OFFSET),
474 zynq_fpga_read(priv, STATUS_OFFSET),
475 zynq_fpga_read(priv, MCTRL_OFFSET));
476
477out_clk:
478 clk_disable(priv->clk);
479
480out_free:
481 dma_unmap_sg(mgr->dev.parent, sgt->sgl, sgt->nents, DMA_TO_DEVICE);
482 return err;
483}
484
485static int zynq_fpga_ops_write_complete(struct fpga_manager *mgr,
486 struct fpga_image_info *info)
487{
488 struct zynq_fpga_priv *priv = mgr->priv;
489 int err;
490 u32 intr_status;
491
492 err = clk_enable(priv->clk);
493 if (err)
494 return err;
495
496 err = zynq_fpga_poll_timeout(priv, INT_STS_OFFSET, intr_status,
497 intr_status & IXR_PCFG_DONE_MASK,
498 INIT_POLL_DELAY,
499 INIT_POLL_TIMEOUT);
500
501 /* Release 'PR' control back to the ICAP */
502 zynq_fpga_write(priv, CTRL_OFFSET,
503 zynq_fpga_read(priv, CTRL_OFFSET) & ~CTRL_PCAP_PR_MASK);
504
505 clk_disable(priv->clk);
506
507 if (err)
508 return err;
509
510 /* for the partial reconfig case we didn't touch the level shifters */
511 if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {
512 /* enable level shifters from PL to PS */
513 regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET,
514 LVL_SHFTR_ENABLE_PL_TO_PS);
515
516 /* deassert AXI interface resets */
517 regmap_write(priv->slcr, SLCR_FPGA_RST_CTRL_OFFSET,
518 FPGA_RST_NONE_MASK);
519 }
520
521 return 0;
522}
523
524static enum fpga_mgr_states zynq_fpga_ops_state(struct fpga_manager *mgr)
525{
526 int err;
527 u32 intr_status;
528 struct zynq_fpga_priv *priv;
529
530 priv = mgr->priv;
531
532 err = clk_enable(priv->clk);
533 if (err)
534 return FPGA_MGR_STATE_UNKNOWN;
535
536 intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
537 clk_disable(priv->clk);
538
539 if (intr_status & IXR_PCFG_DONE_MASK)
540 return FPGA_MGR_STATE_OPERATING;
541
542 return FPGA_MGR_STATE_UNKNOWN;
543}
544
545static const struct fpga_manager_ops zynq_fpga_ops = {
546 .initial_header_size = 128,
547 .state = zynq_fpga_ops_state,
548 .write_init = zynq_fpga_ops_write_init,
549 .write_sg = zynq_fpga_ops_write,
550 .write_complete = zynq_fpga_ops_write_complete,
551};
552
553static int zynq_fpga_probe(struct platform_device *pdev)
554{
555 struct device *dev = &pdev->dev;
556 struct zynq_fpga_priv *priv;
557 struct fpga_manager *mgr;
558 int err;
559
560 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
561 if (!priv)
562 return -ENOMEM;
563 spin_lock_init(&priv->dma_lock);
564
565 priv->io_base = devm_platform_ioremap_resource(pdev, 0);
566 if (IS_ERR(priv->io_base))
567 return PTR_ERR(priv->io_base);
568
569 priv->slcr = syscon_regmap_lookup_by_phandle(dev->of_node,
570 "syscon");
571 if (IS_ERR(priv->slcr)) {
572 dev_err(dev, "unable to get zynq-slcr regmap\n");
573 return PTR_ERR(priv->slcr);
574 }
575
576 init_completion(&priv->dma_done);
577
578 priv->irq = platform_get_irq(pdev, 0);
579 if (priv->irq < 0)
580 return priv->irq;
581
582 priv->clk = devm_clk_get(dev, "ref_clk");
583 if (IS_ERR(priv->clk))
584 return dev_err_probe(dev, PTR_ERR(priv->clk),
585 "input clock not found\n");
586
587 err = clk_prepare_enable(priv->clk);
588 if (err) {
589 dev_err(dev, "unable to enable clock\n");
590 return err;
591 }
592
593 /* unlock the device */
594 zynq_fpga_write(priv, UNLOCK_OFFSET, UNLOCK_MASK);
595
596 zynq_fpga_set_irq(priv, 0);
597 zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK);
598 err = devm_request_irq(dev, priv->irq, zynq_fpga_isr, 0, dev_name(dev),
599 priv);
600 if (err) {
601 dev_err(dev, "unable to request IRQ\n");
602 clk_disable_unprepare(priv->clk);
603 return err;
604 }
605
606 clk_disable(priv->clk);
607
608 mgr = fpga_mgr_register(dev, "Xilinx Zynq FPGA Manager",
609 &zynq_fpga_ops, priv);
610 if (IS_ERR(mgr)) {
611 dev_err(dev, "unable to register FPGA manager\n");
612 clk_unprepare(priv->clk);
613 return PTR_ERR(mgr);
614 }
615
616 platform_set_drvdata(pdev, mgr);
617
618 return 0;
619}
620
621static void zynq_fpga_remove(struct platform_device *pdev)
622{
623 struct zynq_fpga_priv *priv;
624 struct fpga_manager *mgr;
625
626 mgr = platform_get_drvdata(pdev);
627 priv = mgr->priv;
628
629 fpga_mgr_unregister(mgr);
630
631 clk_unprepare(priv->clk);
632}
633
634#ifdef CONFIG_OF
635static const struct of_device_id zynq_fpga_of_match[] = {
636 { .compatible = "xlnx,zynq-devcfg-1.0", },
637 {},
638};
639
640MODULE_DEVICE_TABLE(of, zynq_fpga_of_match);
641#endif
642
643static struct platform_driver zynq_fpga_driver = {
644 .probe = zynq_fpga_probe,
645 .remove_new = zynq_fpga_remove,
646 .driver = {
647 .name = "zynq_fpga_manager",
648 .of_match_table = of_match_ptr(zynq_fpga_of_match),
649 },
650};
651
652module_platform_driver(zynq_fpga_driver);
653
654MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
655MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>");
656MODULE_DESCRIPTION("Xilinx Zynq FPGA Manager");
657MODULE_LICENSE("GPL v2");
1/*
2 * Copyright (c) 2011-2015 Xilinx Inc.
3 * Copyright (c) 2015, National Instruments Corp.
4 *
5 * FPGA Manager Driver for Xilinx Zynq, heavily based on xdevcfg driver
6 * in their vendor tree.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/clk.h>
19#include <linux/completion.h>
20#include <linux/delay.h>
21#include <linux/dma-mapping.h>
22#include <linux/fpga/fpga-mgr.h>
23#include <linux/interrupt.h>
24#include <linux/io.h>
25#include <linux/iopoll.h>
26#include <linux/module.h>
27#include <linux/mfd/syscon.h>
28#include <linux/of_address.h>
29#include <linux/of_irq.h>
30#include <linux/pm.h>
31#include <linux/regmap.h>
32#include <linux/string.h>
33#include <linux/scatterlist.h>
34
35/* Offsets into SLCR regmap */
36
37/* FPGA Software Reset Control */
38#define SLCR_FPGA_RST_CTRL_OFFSET 0x240
39/* Level Shifters Enable */
40#define SLCR_LVL_SHFTR_EN_OFFSET 0x900
41
42/* Constant Definitions */
43
44/* Control Register */
45#define CTRL_OFFSET 0x00
46/* Lock Register */
47#define LOCK_OFFSET 0x04
48/* Interrupt Status Register */
49#define INT_STS_OFFSET 0x0c
50/* Interrupt Mask Register */
51#define INT_MASK_OFFSET 0x10
52/* Status Register */
53#define STATUS_OFFSET 0x14
54/* DMA Source Address Register */
55#define DMA_SRC_ADDR_OFFSET 0x18
56/* DMA Destination Address Reg */
57#define DMA_DST_ADDR_OFFSET 0x1c
58/* DMA Source Transfer Length */
59#define DMA_SRC_LEN_OFFSET 0x20
60/* DMA Destination Transfer */
61#define DMA_DEST_LEN_OFFSET 0x24
62/* Unlock Register */
63#define UNLOCK_OFFSET 0x34
64/* Misc. Control Register */
65#define MCTRL_OFFSET 0x80
66
67/* Control Register Bit definitions */
68
69/* Signal to reset FPGA */
70#define CTRL_PCFG_PROG_B_MASK BIT(30)
71/* Enable PCAP for PR */
72#define CTRL_PCAP_PR_MASK BIT(27)
73/* Enable PCAP */
74#define CTRL_PCAP_MODE_MASK BIT(26)
75/* Lower rate to allow decrypt on the fly */
76#define CTRL_PCAP_RATE_EN_MASK BIT(25)
77/* System booted in secure mode */
78#define CTRL_SEC_EN_MASK BIT(7)
79
80/* Miscellaneous Control Register bit definitions */
81/* Internal PCAP loopback */
82#define MCTRL_PCAP_LPBK_MASK BIT(4)
83
84/* Status register bit definitions */
85
86/* FPGA init status */
87#define STATUS_DMA_Q_F BIT(31)
88#define STATUS_DMA_Q_E BIT(30)
89#define STATUS_PCFG_INIT_MASK BIT(4)
90
91/* Interrupt Status/Mask Register Bit definitions */
92/* DMA command done */
93#define IXR_DMA_DONE_MASK BIT(13)
94/* DMA and PCAP cmd done */
95#define IXR_D_P_DONE_MASK BIT(12)
96 /* FPGA programmed */
97#define IXR_PCFG_DONE_MASK BIT(2)
98#define IXR_ERROR_FLAGS_MASK 0x00F0C860
99#define IXR_ALL_MASK 0xF8F7F87F
100
101/* Miscellaneous constant values */
102
103/* Invalid DMA addr */
104#define DMA_INVALID_ADDRESS GENMASK(31, 0)
105/* Used to unlock the dev */
106#define UNLOCK_MASK 0x757bdf0d
107/* Timeout for polling reset bits */
108#define INIT_POLL_TIMEOUT 2500000
109/* Delay for polling reset bits */
110#define INIT_POLL_DELAY 20
111/* Signal this is the last DMA transfer, wait for the AXI and PCAP before
112 * interrupting
113 */
114#define DMA_SRC_LAST_TRANSFER 1
115/* Timeout for DMA completion */
116#define DMA_TIMEOUT_MS 5000
117
118/* Masks for controlling stuff in SLCR */
119/* Disable all Level shifters */
120#define LVL_SHFTR_DISABLE_ALL_MASK 0x0
121/* Enable Level shifters from PS to PL */
122#define LVL_SHFTR_ENABLE_PS_TO_PL 0xa
123/* Enable Level shifters from PL to PS */
124#define LVL_SHFTR_ENABLE_PL_TO_PS 0xf
125/* Enable global resets */
126#define FPGA_RST_ALL_MASK 0xf
127/* Disable global resets */
128#define FPGA_RST_NONE_MASK 0x0
129
130struct zynq_fpga_priv {
131 int irq;
132 struct clk *clk;
133
134 void __iomem *io_base;
135 struct regmap *slcr;
136
137 spinlock_t dma_lock;
138 unsigned int dma_elm;
139 unsigned int dma_nelms;
140 struct scatterlist *cur_sg;
141
142 struct completion dma_done;
143};
144
145static inline void zynq_fpga_write(struct zynq_fpga_priv *priv, u32 offset,
146 u32 val)
147{
148 writel(val, priv->io_base + offset);
149}
150
151static inline u32 zynq_fpga_read(const struct zynq_fpga_priv *priv,
152 u32 offset)
153{
154 return readl(priv->io_base + offset);
155}
156
157#define zynq_fpga_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \
158 readl_poll_timeout(priv->io_base + addr, val, cond, sleep_us, \
159 timeout_us)
160
161/* Cause the specified irq mask bits to generate IRQs */
162static inline void zynq_fpga_set_irq(struct zynq_fpga_priv *priv, u32 enable)
163{
164 zynq_fpga_write(priv, INT_MASK_OFFSET, ~enable);
165}
166
167/* Must be called with dma_lock held */
168static void zynq_step_dma(struct zynq_fpga_priv *priv)
169{
170 u32 addr;
171 u32 len;
172 bool first;
173
174 first = priv->dma_elm == 0;
175 while (priv->cur_sg) {
176 /* Feed the DMA queue until it is full. */
177 if (zynq_fpga_read(priv, STATUS_OFFSET) & STATUS_DMA_Q_F)
178 break;
179
180 addr = sg_dma_address(priv->cur_sg);
181 len = sg_dma_len(priv->cur_sg);
182 if (priv->dma_elm + 1 == priv->dma_nelms) {
183 /* The last transfer waits for the PCAP to finish too,
184 * notice this also changes the irq_mask to ignore
185 * IXR_DMA_DONE_MASK which ensures we do not trigger
186 * the completion too early.
187 */
188 addr |= DMA_SRC_LAST_TRANSFER;
189 priv->cur_sg = NULL;
190 } else {
191 priv->cur_sg = sg_next(priv->cur_sg);
192 priv->dma_elm++;
193 }
194
195 zynq_fpga_write(priv, DMA_SRC_ADDR_OFFSET, addr);
196 zynq_fpga_write(priv, DMA_DST_ADDR_OFFSET, DMA_INVALID_ADDRESS);
197 zynq_fpga_write(priv, DMA_SRC_LEN_OFFSET, len / 4);
198 zynq_fpga_write(priv, DMA_DEST_LEN_OFFSET, 0);
199 }
200
201 /* Once the first transfer is queued we can turn on the ISR, future
202 * calls to zynq_step_dma will happen from the ISR context. The
203 * dma_lock spinlock guarentees this handover is done coherently, the
204 * ISR enable is put at the end to avoid another CPU spinning in the
205 * ISR on this lock.
206 */
207 if (first && priv->cur_sg) {
208 zynq_fpga_set_irq(priv,
209 IXR_DMA_DONE_MASK | IXR_ERROR_FLAGS_MASK);
210 } else if (!priv->cur_sg) {
211 /* The last transfer changes to DMA & PCAP mode since we do
212 * not want to continue until everything has been flushed into
213 * the PCAP.
214 */
215 zynq_fpga_set_irq(priv,
216 IXR_D_P_DONE_MASK | IXR_ERROR_FLAGS_MASK);
217 }
218}
219
220static irqreturn_t zynq_fpga_isr(int irq, void *data)
221{
222 struct zynq_fpga_priv *priv = data;
223 u32 intr_status;
224
225 /* If anything other than DMA completion is reported stop and hand
226 * control back to zynq_fpga_ops_write, something went wrong,
227 * otherwise progress the DMA.
228 */
229 spin_lock(&priv->dma_lock);
230 intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
231 if (!(intr_status & IXR_ERROR_FLAGS_MASK) &&
232 (intr_status & IXR_DMA_DONE_MASK) && priv->cur_sg) {
233 zynq_fpga_write(priv, INT_STS_OFFSET, IXR_DMA_DONE_MASK);
234 zynq_step_dma(priv);
235 spin_unlock(&priv->dma_lock);
236 return IRQ_HANDLED;
237 }
238 spin_unlock(&priv->dma_lock);
239
240 zynq_fpga_set_irq(priv, 0);
241 complete(&priv->dma_done);
242
243 return IRQ_HANDLED;
244}
245
246/* Sanity check the proposed bitstream. It must start with the sync word in
247 * the correct byte order, and be dword aligned. The input is a Xilinx .bin
248 * file with every 32 bit quantity swapped.
249 */
250static bool zynq_fpga_has_sync(const u8 *buf, size_t count)
251{
252 for (; count >= 4; buf += 4, count -= 4)
253 if (buf[0] == 0x66 && buf[1] == 0x55 && buf[2] == 0x99 &&
254 buf[3] == 0xaa)
255 return true;
256 return false;
257}
258
259static int zynq_fpga_ops_write_init(struct fpga_manager *mgr,
260 struct fpga_image_info *info,
261 const char *buf, size_t count)
262{
263 struct zynq_fpga_priv *priv;
264 u32 ctrl, status;
265 int err;
266
267 priv = mgr->priv;
268
269 err = clk_enable(priv->clk);
270 if (err)
271 return err;
272
273 /* check if bitstream is encrypted & and system's still secure */
274 if (info->flags & FPGA_MGR_ENCRYPTED_BITSTREAM) {
275 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
276 if (!(ctrl & CTRL_SEC_EN_MASK)) {
277 dev_err(&mgr->dev,
278 "System not secure, can't use crypted bitstreams\n");
279 err = -EINVAL;
280 goto out_err;
281 }
282 }
283
284 /* don't globally reset PL if we're doing partial reconfig */
285 if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {
286 if (!zynq_fpga_has_sync(buf, count)) {
287 dev_err(&mgr->dev,
288 "Invalid bitstream, could not find a sync word. Bitstream must be a byte swapped .bin file\n");
289 err = -EINVAL;
290 goto out_err;
291 }
292
293 /* assert AXI interface resets */
294 regmap_write(priv->slcr, SLCR_FPGA_RST_CTRL_OFFSET,
295 FPGA_RST_ALL_MASK);
296
297 /* disable all level shifters */
298 regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET,
299 LVL_SHFTR_DISABLE_ALL_MASK);
300 /* enable level shifters from PS to PL */
301 regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET,
302 LVL_SHFTR_ENABLE_PS_TO_PL);
303
304 /* create a rising edge on PCFG_INIT. PCFG_INIT follows
305 * PCFG_PROG_B, so we need to poll it after setting PCFG_PROG_B
306 * to make sure the rising edge actually happens.
307 * Note: PCFG_PROG_B is low active, sequence as described in
308 * UG585 v1.10 page 211
309 */
310 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
311 ctrl |= CTRL_PCFG_PROG_B_MASK;
312
313 zynq_fpga_write(priv, CTRL_OFFSET, ctrl);
314
315 err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status,
316 status & STATUS_PCFG_INIT_MASK,
317 INIT_POLL_DELAY,
318 INIT_POLL_TIMEOUT);
319 if (err) {
320 dev_err(&mgr->dev, "Timeout waiting for PCFG_INIT\n");
321 goto out_err;
322 }
323
324 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
325 ctrl &= ~CTRL_PCFG_PROG_B_MASK;
326
327 zynq_fpga_write(priv, CTRL_OFFSET, ctrl);
328
329 err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status,
330 !(status & STATUS_PCFG_INIT_MASK),
331 INIT_POLL_DELAY,
332 INIT_POLL_TIMEOUT);
333 if (err) {
334 dev_err(&mgr->dev, "Timeout waiting for !PCFG_INIT\n");
335 goto out_err;
336 }
337
338 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
339 ctrl |= CTRL_PCFG_PROG_B_MASK;
340
341 zynq_fpga_write(priv, CTRL_OFFSET, ctrl);
342
343 err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status,
344 status & STATUS_PCFG_INIT_MASK,
345 INIT_POLL_DELAY,
346 INIT_POLL_TIMEOUT);
347 if (err) {
348 dev_err(&mgr->dev, "Timeout waiting for PCFG_INIT\n");
349 goto out_err;
350 }
351 }
352
353 /* set configuration register with following options:
354 * - enable PCAP interface
355 * - set throughput for maximum speed (if bistream not crypted)
356 * - set CPU in user mode
357 */
358 ctrl = zynq_fpga_read(priv, CTRL_OFFSET);
359 if (info->flags & FPGA_MGR_ENCRYPTED_BITSTREAM)
360 zynq_fpga_write(priv, CTRL_OFFSET,
361 (CTRL_PCAP_PR_MASK | CTRL_PCAP_MODE_MASK
362 | CTRL_PCAP_RATE_EN_MASK | ctrl));
363 else
364 zynq_fpga_write(priv, CTRL_OFFSET,
365 (CTRL_PCAP_PR_MASK | CTRL_PCAP_MODE_MASK
366 | ctrl));
367
368
369 /* We expect that the command queue is empty right now. */
370 status = zynq_fpga_read(priv, STATUS_OFFSET);
371 if ((status & STATUS_DMA_Q_F) ||
372 (status & STATUS_DMA_Q_E) != STATUS_DMA_Q_E) {
373 dev_err(&mgr->dev, "DMA command queue not right\n");
374 err = -EBUSY;
375 goto out_err;
376 }
377
378 /* ensure internal PCAP loopback is disabled */
379 ctrl = zynq_fpga_read(priv, MCTRL_OFFSET);
380 zynq_fpga_write(priv, MCTRL_OFFSET, (~MCTRL_PCAP_LPBK_MASK & ctrl));
381
382 clk_disable(priv->clk);
383
384 return 0;
385
386out_err:
387 clk_disable(priv->clk);
388
389 return err;
390}
391
392static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt)
393{
394 struct zynq_fpga_priv *priv;
395 const char *why;
396 int err;
397 u32 intr_status;
398 unsigned long timeout;
399 unsigned long flags;
400 struct scatterlist *sg;
401 int i;
402
403 priv = mgr->priv;
404
405 /* The hardware can only DMA multiples of 4 bytes, and it requires the
406 * starting addresses to be aligned to 64 bits (UG585 pg 212).
407 */
408 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
409 if ((sg->offset % 8) || (sg->length % 4)) {
410 dev_err(&mgr->dev,
411 "Invalid bitstream, chunks must be aligned\n");
412 return -EINVAL;
413 }
414 }
415
416 priv->dma_nelms =
417 dma_map_sg(mgr->dev.parent, sgt->sgl, sgt->nents, DMA_TO_DEVICE);
418 if (priv->dma_nelms == 0) {
419 dev_err(&mgr->dev, "Unable to DMA map (TO_DEVICE)\n");
420 return -ENOMEM;
421 }
422
423 /* enable clock */
424 err = clk_enable(priv->clk);
425 if (err)
426 goto out_free;
427
428 zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK);
429 reinit_completion(&priv->dma_done);
430
431 /* zynq_step_dma will turn on interrupts */
432 spin_lock_irqsave(&priv->dma_lock, flags);
433 priv->dma_elm = 0;
434 priv->cur_sg = sgt->sgl;
435 zynq_step_dma(priv);
436 spin_unlock_irqrestore(&priv->dma_lock, flags);
437
438 timeout = wait_for_completion_timeout(&priv->dma_done,
439 msecs_to_jiffies(DMA_TIMEOUT_MS));
440
441 spin_lock_irqsave(&priv->dma_lock, flags);
442 zynq_fpga_set_irq(priv, 0);
443 priv->cur_sg = NULL;
444 spin_unlock_irqrestore(&priv->dma_lock, flags);
445
446 intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
447 zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK);
448
449 /* There doesn't seem to be a way to force cancel any DMA, so if
450 * something went wrong we are relying on the hardware to have halted
451 * the DMA before we get here, if there was we could use
452 * wait_for_completion_interruptible too.
453 */
454
455 if (intr_status & IXR_ERROR_FLAGS_MASK) {
456 why = "DMA reported error";
457 err = -EIO;
458 goto out_report;
459 }
460
461 if (priv->cur_sg ||
462 !((intr_status & IXR_D_P_DONE_MASK) == IXR_D_P_DONE_MASK)) {
463 if (timeout == 0)
464 why = "DMA timed out";
465 else
466 why = "DMA did not complete";
467 err = -EIO;
468 goto out_report;
469 }
470
471 err = 0;
472 goto out_clk;
473
474out_report:
475 dev_err(&mgr->dev,
476 "%s: INT_STS:0x%x CTRL:0x%x LOCK:0x%x INT_MASK:0x%x STATUS:0x%x MCTRL:0x%x\n",
477 why,
478 intr_status,
479 zynq_fpga_read(priv, CTRL_OFFSET),
480 zynq_fpga_read(priv, LOCK_OFFSET),
481 zynq_fpga_read(priv, INT_MASK_OFFSET),
482 zynq_fpga_read(priv, STATUS_OFFSET),
483 zynq_fpga_read(priv, MCTRL_OFFSET));
484
485out_clk:
486 clk_disable(priv->clk);
487
488out_free:
489 dma_unmap_sg(mgr->dev.parent, sgt->sgl, sgt->nents, DMA_TO_DEVICE);
490 return err;
491}
492
493static int zynq_fpga_ops_write_complete(struct fpga_manager *mgr,
494 struct fpga_image_info *info)
495{
496 struct zynq_fpga_priv *priv = mgr->priv;
497 int err;
498 u32 intr_status;
499
500 err = clk_enable(priv->clk);
501 if (err)
502 return err;
503
504 err = zynq_fpga_poll_timeout(priv, INT_STS_OFFSET, intr_status,
505 intr_status & IXR_PCFG_DONE_MASK,
506 INIT_POLL_DELAY,
507 INIT_POLL_TIMEOUT);
508
509 clk_disable(priv->clk);
510
511 if (err)
512 return err;
513
514 /* for the partial reconfig case we didn't touch the level shifters */
515 if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {
516 /* enable level shifters from PL to PS */
517 regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET,
518 LVL_SHFTR_ENABLE_PL_TO_PS);
519
520 /* deassert AXI interface resets */
521 regmap_write(priv->slcr, SLCR_FPGA_RST_CTRL_OFFSET,
522 FPGA_RST_NONE_MASK);
523 }
524
525 return 0;
526}
527
528static enum fpga_mgr_states zynq_fpga_ops_state(struct fpga_manager *mgr)
529{
530 int err;
531 u32 intr_status;
532 struct zynq_fpga_priv *priv;
533
534 priv = mgr->priv;
535
536 err = clk_enable(priv->clk);
537 if (err)
538 return FPGA_MGR_STATE_UNKNOWN;
539
540 intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
541 clk_disable(priv->clk);
542
543 if (intr_status & IXR_PCFG_DONE_MASK)
544 return FPGA_MGR_STATE_OPERATING;
545
546 return FPGA_MGR_STATE_UNKNOWN;
547}
548
549static const struct fpga_manager_ops zynq_fpga_ops = {
550 .initial_header_size = 128,
551 .state = zynq_fpga_ops_state,
552 .write_init = zynq_fpga_ops_write_init,
553 .write_sg = zynq_fpga_ops_write,
554 .write_complete = zynq_fpga_ops_write_complete,
555};
556
557static int zynq_fpga_probe(struct platform_device *pdev)
558{
559 struct device *dev = &pdev->dev;
560 struct zynq_fpga_priv *priv;
561 struct resource *res;
562 int err;
563
564 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
565 if (!priv)
566 return -ENOMEM;
567 spin_lock_init(&priv->dma_lock);
568
569 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
570 priv->io_base = devm_ioremap_resource(dev, res);
571 if (IS_ERR(priv->io_base))
572 return PTR_ERR(priv->io_base);
573
574 priv->slcr = syscon_regmap_lookup_by_phandle(dev->of_node,
575 "syscon");
576 if (IS_ERR(priv->slcr)) {
577 dev_err(dev, "unable to get zynq-slcr regmap\n");
578 return PTR_ERR(priv->slcr);
579 }
580
581 init_completion(&priv->dma_done);
582
583 priv->irq = platform_get_irq(pdev, 0);
584 if (priv->irq < 0) {
585 dev_err(dev, "No IRQ available\n");
586 return priv->irq;
587 }
588
589 priv->clk = devm_clk_get(dev, "ref_clk");
590 if (IS_ERR(priv->clk)) {
591 dev_err(dev, "input clock not found\n");
592 return PTR_ERR(priv->clk);
593 }
594
595 err = clk_prepare_enable(priv->clk);
596 if (err) {
597 dev_err(dev, "unable to enable clock\n");
598 return err;
599 }
600
601 /* unlock the device */
602 zynq_fpga_write(priv, UNLOCK_OFFSET, UNLOCK_MASK);
603
604 zynq_fpga_set_irq(priv, 0);
605 zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK);
606 err = devm_request_irq(dev, priv->irq, zynq_fpga_isr, 0, dev_name(dev),
607 priv);
608 if (err) {
609 dev_err(dev, "unable to request IRQ\n");
610 clk_disable_unprepare(priv->clk);
611 return err;
612 }
613
614 clk_disable(priv->clk);
615
616 err = fpga_mgr_register(dev, "Xilinx Zynq FPGA Manager",
617 &zynq_fpga_ops, priv);
618 if (err) {
619 dev_err(dev, "unable to register FPGA manager\n");
620 clk_unprepare(priv->clk);
621 return err;
622 }
623
624 return 0;
625}
626
627static int zynq_fpga_remove(struct platform_device *pdev)
628{
629 struct zynq_fpga_priv *priv;
630 struct fpga_manager *mgr;
631
632 mgr = platform_get_drvdata(pdev);
633 priv = mgr->priv;
634
635 fpga_mgr_unregister(&pdev->dev);
636
637 clk_unprepare(priv->clk);
638
639 return 0;
640}
641
642#ifdef CONFIG_OF
643static const struct of_device_id zynq_fpga_of_match[] = {
644 { .compatible = "xlnx,zynq-devcfg-1.0", },
645 {},
646};
647
648MODULE_DEVICE_TABLE(of, zynq_fpga_of_match);
649#endif
650
651static struct platform_driver zynq_fpga_driver = {
652 .probe = zynq_fpga_probe,
653 .remove = zynq_fpga_remove,
654 .driver = {
655 .name = "zynq_fpga_manager",
656 .of_match_table = of_match_ptr(zynq_fpga_of_match),
657 },
658};
659
660module_platform_driver(zynq_fpga_driver);
661
662MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>");
663MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>");
664MODULE_DESCRIPTION("Xilinx Zynq FPGA Manager");
665MODULE_LICENSE("GPL v2");