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37784706 MF |
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> | |
425902f5 | 33 | #include <linux/scatterlist.h> |
37784706 MF |
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 | ||
76 | /* Miscellaneous Control Register bit definitions */ | |
77 | /* Internal PCAP loopback */ | |
78 | #define MCTRL_PCAP_LPBK_MASK BIT(4) | |
79 | ||
80 | /* Status register bit definitions */ | |
81 | ||
82 | /* FPGA init status */ | |
83 | #define STATUS_DMA_Q_F BIT(31) | |
425902f5 | 84 | #define STATUS_DMA_Q_E BIT(30) |
37784706 MF |
85 | #define STATUS_PCFG_INIT_MASK BIT(4) |
86 | ||
87 | /* Interrupt Status/Mask Register Bit definitions */ | |
88 | /* DMA command done */ | |
89 | #define IXR_DMA_DONE_MASK BIT(13) | |
90 | /* DMA and PCAP cmd done */ | |
91 | #define IXR_D_P_DONE_MASK BIT(12) | |
92 | /* FPGA programmed */ | |
93 | #define IXR_PCFG_DONE_MASK BIT(2) | |
6b45e0f2 | 94 | #define IXR_ERROR_FLAGS_MASK 0x00F0C860 |
37784706 MF |
95 | #define IXR_ALL_MASK 0xF8F7F87F |
96 | ||
97 | /* Miscellaneous constant values */ | |
98 | ||
99 | /* Invalid DMA addr */ | |
100 | #define DMA_INVALID_ADDRESS GENMASK(31, 0) | |
101 | /* Used to unlock the dev */ | |
102 | #define UNLOCK_MASK 0x757bdf0d | |
37784706 MF |
103 | /* Timeout for polling reset bits */ |
104 | #define INIT_POLL_TIMEOUT 2500000 | |
105 | /* Delay for polling reset bits */ | |
106 | #define INIT_POLL_DELAY 20 | |
425902f5 JG |
107 | /* Signal this is the last DMA transfer, wait for the AXI and PCAP before |
108 | * interrupting | |
109 | */ | |
110 | #define DMA_SRC_LAST_TRANSFER 1 | |
111 | /* Timeout for DMA completion */ | |
112 | #define DMA_TIMEOUT_MS 5000 | |
37784706 MF |
113 | |
114 | /* Masks for controlling stuff in SLCR */ | |
115 | /* Disable all Level shifters */ | |
116 | #define LVL_SHFTR_DISABLE_ALL_MASK 0x0 | |
117 | /* Enable Level shifters from PS to PL */ | |
118 | #define LVL_SHFTR_ENABLE_PS_TO_PL 0xa | |
119 | /* Enable Level shifters from PL to PS */ | |
120 | #define LVL_SHFTR_ENABLE_PL_TO_PS 0xf | |
121 | /* Enable global resets */ | |
122 | #define FPGA_RST_ALL_MASK 0xf | |
123 | /* Disable global resets */ | |
124 | #define FPGA_RST_NONE_MASK 0x0 | |
125 | ||
126 | struct zynq_fpga_priv { | |
37784706 MF |
127 | int irq; |
128 | struct clk *clk; | |
129 | ||
130 | void __iomem *io_base; | |
131 | struct regmap *slcr; | |
132 | ||
425902f5 JG |
133 | spinlock_t dma_lock; |
134 | unsigned int dma_elm; | |
135 | unsigned int dma_nelms; | |
136 | struct scatterlist *cur_sg; | |
137 | ||
37784706 MF |
138 | struct completion dma_done; |
139 | }; | |
140 | ||
141 | static inline void zynq_fpga_write(struct zynq_fpga_priv *priv, u32 offset, | |
142 | u32 val) | |
143 | { | |
144 | writel(val, priv->io_base + offset); | |
145 | } | |
146 | ||
147 | static inline u32 zynq_fpga_read(const struct zynq_fpga_priv *priv, | |
148 | u32 offset) | |
149 | { | |
150 | return readl(priv->io_base + offset); | |
151 | } | |
152 | ||
153 | #define zynq_fpga_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \ | |
154 | readl_poll_timeout(priv->io_base + addr, val, cond, sleep_us, \ | |
155 | timeout_us) | |
156 | ||
6b45e0f2 JG |
157 | /* Cause the specified irq mask bits to generate IRQs */ |
158 | static inline void zynq_fpga_set_irq(struct zynq_fpga_priv *priv, u32 enable) | |
37784706 | 159 | { |
6b45e0f2 | 160 | zynq_fpga_write(priv, INT_MASK_OFFSET, ~enable); |
37784706 MF |
161 | } |
162 | ||
425902f5 JG |
163 | /* Must be called with dma_lock held */ |
164 | static void zynq_step_dma(struct zynq_fpga_priv *priv) | |
165 | { | |
166 | u32 addr; | |
167 | u32 len; | |
168 | bool first; | |
169 | ||
170 | first = priv->dma_elm == 0; | |
171 | while (priv->cur_sg) { | |
172 | /* Feed the DMA queue until it is full. */ | |
173 | if (zynq_fpga_read(priv, STATUS_OFFSET) & STATUS_DMA_Q_F) | |
174 | break; | |
175 | ||
176 | addr = sg_dma_address(priv->cur_sg); | |
177 | len = sg_dma_len(priv->cur_sg); | |
178 | if (priv->dma_elm + 1 == priv->dma_nelms) { | |
179 | /* The last transfer waits for the PCAP to finish too, | |
180 | * notice this also changes the irq_mask to ignore | |
181 | * IXR_DMA_DONE_MASK which ensures we do not trigger | |
182 | * the completion too early. | |
183 | */ | |
184 | addr |= DMA_SRC_LAST_TRANSFER; | |
185 | priv->cur_sg = NULL; | |
186 | } else { | |
187 | priv->cur_sg = sg_next(priv->cur_sg); | |
188 | priv->dma_elm++; | |
189 | } | |
190 | ||
191 | zynq_fpga_write(priv, DMA_SRC_ADDR_OFFSET, addr); | |
192 | zynq_fpga_write(priv, DMA_DST_ADDR_OFFSET, DMA_INVALID_ADDRESS); | |
193 | zynq_fpga_write(priv, DMA_SRC_LEN_OFFSET, len / 4); | |
194 | zynq_fpga_write(priv, DMA_DEST_LEN_OFFSET, 0); | |
195 | } | |
196 | ||
197 | /* Once the first transfer is queued we can turn on the ISR, future | |
198 | * calls to zynq_step_dma will happen from the ISR context. The | |
199 | * dma_lock spinlock guarentees this handover is done coherently, the | |
200 | * ISR enable is put at the end to avoid another CPU spinning in the | |
201 | * ISR on this lock. | |
202 | */ | |
203 | if (first && priv->cur_sg) { | |
204 | zynq_fpga_set_irq(priv, | |
205 | IXR_DMA_DONE_MASK | IXR_ERROR_FLAGS_MASK); | |
206 | } else if (!priv->cur_sg) { | |
207 | /* The last transfer changes to DMA & PCAP mode since we do | |
208 | * not want to continue until everything has been flushed into | |
209 | * the PCAP. | |
210 | */ | |
211 | zynq_fpga_set_irq(priv, | |
212 | IXR_D_P_DONE_MASK | IXR_ERROR_FLAGS_MASK); | |
213 | } | |
214 | } | |
215 | ||
37784706 MF |
216 | static irqreturn_t zynq_fpga_isr(int irq, void *data) |
217 | { | |
218 | struct zynq_fpga_priv *priv = data; | |
425902f5 | 219 | u32 intr_status; |
37784706 | 220 | |
425902f5 JG |
221 | /* If anything other than DMA completion is reported stop and hand |
222 | * control back to zynq_fpga_ops_write, something went wrong, | |
223 | * otherwise progress the DMA. | |
224 | */ | |
225 | spin_lock(&priv->dma_lock); | |
226 | intr_status = zynq_fpga_read(priv, INT_STS_OFFSET); | |
227 | if (!(intr_status & IXR_ERROR_FLAGS_MASK) && | |
228 | (intr_status & IXR_DMA_DONE_MASK) && priv->cur_sg) { | |
229 | zynq_fpga_write(priv, INT_STS_OFFSET, IXR_DMA_DONE_MASK); | |
230 | zynq_step_dma(priv); | |
231 | spin_unlock(&priv->dma_lock); | |
232 | return IRQ_HANDLED; | |
233 | } | |
234 | spin_unlock(&priv->dma_lock); | |
37784706 | 235 | |
425902f5 | 236 | zynq_fpga_set_irq(priv, 0); |
37784706 MF |
237 | complete(&priv->dma_done); |
238 | ||
239 | return IRQ_HANDLED; | |
240 | } | |
241 | ||
b496df86 JG |
242 | /* Sanity check the proposed bitstream. It must start with the sync word in |
243 | * the correct byte order, and be dword aligned. The input is a Xilinx .bin | |
244 | * file with every 32 bit quantity swapped. | |
245 | */ | |
246 | static bool zynq_fpga_has_sync(const u8 *buf, size_t count) | |
247 | { | |
248 | for (; count >= 4; buf += 4, count -= 4) | |
249 | if (buf[0] == 0x66 && buf[1] == 0x55 && buf[2] == 0x99 && | |
250 | buf[3] == 0xaa) | |
251 | return true; | |
252 | return false; | |
253 | } | |
254 | ||
1df2865f AT |
255 | static int zynq_fpga_ops_write_init(struct fpga_manager *mgr, |
256 | struct fpga_image_info *info, | |
37784706 MF |
257 | const char *buf, size_t count) |
258 | { | |
259 | struct zynq_fpga_priv *priv; | |
260 | u32 ctrl, status; | |
261 | int err; | |
262 | ||
263 | priv = mgr->priv; | |
264 | ||
265 | err = clk_enable(priv->clk); | |
266 | if (err) | |
267 | return err; | |
268 | ||
269 | /* don't globally reset PL if we're doing partial reconfig */ | |
1df2865f | 270 | if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) { |
b496df86 JG |
271 | if (!zynq_fpga_has_sync(buf, count)) { |
272 | dev_err(&mgr->dev, | |
273 | "Invalid bitstream, could not find a sync word. Bitstream must be a byte swapped .bin file\n"); | |
274 | err = -EINVAL; | |
275 | goto out_err; | |
276 | } | |
277 | ||
37784706 MF |
278 | /* assert AXI interface resets */ |
279 | regmap_write(priv->slcr, SLCR_FPGA_RST_CTRL_OFFSET, | |
280 | FPGA_RST_ALL_MASK); | |
281 | ||
282 | /* disable all level shifters */ | |
283 | regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET, | |
284 | LVL_SHFTR_DISABLE_ALL_MASK); | |
285 | /* enable level shifters from PS to PL */ | |
286 | regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET, | |
287 | LVL_SHFTR_ENABLE_PS_TO_PL); | |
288 | ||
289 | /* create a rising edge on PCFG_INIT. PCFG_INIT follows | |
290 | * PCFG_PROG_B, so we need to poll it after setting PCFG_PROG_B | |
291 | * to make sure the rising edge actually happens. | |
292 | * Note: PCFG_PROG_B is low active, sequence as described in | |
293 | * UG585 v1.10 page 211 | |
294 | */ | |
295 | ctrl = zynq_fpga_read(priv, CTRL_OFFSET); | |
296 | ctrl |= CTRL_PCFG_PROG_B_MASK; | |
297 | ||
298 | zynq_fpga_write(priv, CTRL_OFFSET, ctrl); | |
299 | ||
300 | err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status, | |
301 | status & STATUS_PCFG_INIT_MASK, | |
302 | INIT_POLL_DELAY, | |
303 | INIT_POLL_TIMEOUT); | |
304 | if (err) { | |
80baf649 | 305 | dev_err(&mgr->dev, "Timeout waiting for PCFG_INIT\n"); |
37784706 MF |
306 | goto out_err; |
307 | } | |
308 | ||
309 | ctrl = zynq_fpga_read(priv, CTRL_OFFSET); | |
310 | ctrl &= ~CTRL_PCFG_PROG_B_MASK; | |
311 | ||
312 | zynq_fpga_write(priv, CTRL_OFFSET, ctrl); | |
313 | ||
314 | err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status, | |
315 | !(status & STATUS_PCFG_INIT_MASK), | |
316 | INIT_POLL_DELAY, | |
317 | INIT_POLL_TIMEOUT); | |
318 | if (err) { | |
80baf649 | 319 | dev_err(&mgr->dev, "Timeout waiting for !PCFG_INIT\n"); |
37784706 MF |
320 | goto out_err; |
321 | } | |
322 | ||
323 | ctrl = zynq_fpga_read(priv, CTRL_OFFSET); | |
324 | ctrl |= CTRL_PCFG_PROG_B_MASK; | |
325 | ||
326 | zynq_fpga_write(priv, CTRL_OFFSET, ctrl); | |
327 | ||
328 | err = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status, | |
329 | status & STATUS_PCFG_INIT_MASK, | |
330 | INIT_POLL_DELAY, | |
331 | INIT_POLL_TIMEOUT); | |
332 | if (err) { | |
80baf649 | 333 | dev_err(&mgr->dev, "Timeout waiting for PCFG_INIT\n"); |
37784706 MF |
334 | goto out_err; |
335 | } | |
336 | } | |
337 | ||
338 | /* set configuration register with following options: | |
339 | * - enable PCAP interface | |
340 | * - set throughput for maximum speed | |
341 | * - set CPU in user mode | |
342 | */ | |
343 | ctrl = zynq_fpga_read(priv, CTRL_OFFSET); | |
344 | zynq_fpga_write(priv, CTRL_OFFSET, | |
345 | (CTRL_PCAP_PR_MASK | CTRL_PCAP_MODE_MASK | ctrl)); | |
346 | ||
425902f5 | 347 | /* We expect that the command queue is empty right now. */ |
37784706 | 348 | status = zynq_fpga_read(priv, STATUS_OFFSET); |
425902f5 JG |
349 | if ((status & STATUS_DMA_Q_F) || |
350 | (status & STATUS_DMA_Q_E) != STATUS_DMA_Q_E) { | |
351 | dev_err(&mgr->dev, "DMA command queue not right\n"); | |
37784706 MF |
352 | err = -EBUSY; |
353 | goto out_err; | |
354 | } | |
355 | ||
356 | /* ensure internal PCAP loopback is disabled */ | |
357 | ctrl = zynq_fpga_read(priv, MCTRL_OFFSET); | |
358 | zynq_fpga_write(priv, MCTRL_OFFSET, (~MCTRL_PCAP_LPBK_MASK & ctrl)); | |
359 | ||
360 | clk_disable(priv->clk); | |
361 | ||
362 | return 0; | |
363 | ||
364 | out_err: | |
365 | clk_disable(priv->clk); | |
366 | ||
367 | return err; | |
368 | } | |
369 | ||
425902f5 | 370 | static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt) |
37784706 MF |
371 | { |
372 | struct zynq_fpga_priv *priv; | |
6b45e0f2 | 373 | const char *why; |
37784706 | 374 | int err; |
37784706 | 375 | u32 intr_status; |
425902f5 JG |
376 | unsigned long timeout; |
377 | unsigned long flags; | |
378 | struct scatterlist *sg; | |
379 | int i; | |
37784706 | 380 | |
37784706 MF |
381 | priv = mgr->priv; |
382 | ||
425902f5 JG |
383 | /* The hardware can only DMA multiples of 4 bytes, and it requires the |
384 | * starting addresses to be aligned to 64 bits (UG585 pg 212). | |
385 | */ | |
386 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
387 | if ((sg->offset % 8) || (sg->length % 4)) { | |
388 | dev_err(&mgr->dev, | |
389 | "Invalid bitstream, chunks must be aligned\n"); | |
390 | return -EINVAL; | |
391 | } | |
392 | } | |
37784706 | 393 | |
425902f5 JG |
394 | priv->dma_nelms = |
395 | dma_map_sg(mgr->dev.parent, sgt->sgl, sgt->nents, DMA_TO_DEVICE); | |
396 | if (priv->dma_nelms == 0) { | |
397 | dev_err(&mgr->dev, "Unable to DMA map (TO_DEVICE)\n"); | |
398 | return -ENOMEM; | |
399 | } | |
37784706 | 400 | |
37784706 MF |
401 | /* enable clock */ |
402 | err = clk_enable(priv->clk); | |
403 | if (err) | |
404 | goto out_free; | |
405 | ||
406 | zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK); | |
37784706 MF |
407 | reinit_completion(&priv->dma_done); |
408 | ||
425902f5 JG |
409 | /* zynq_step_dma will turn on interrupts */ |
410 | spin_lock_irqsave(&priv->dma_lock, flags); | |
411 | priv->dma_elm = 0; | |
412 | priv->cur_sg = sgt->sgl; | |
413 | zynq_step_dma(priv); | |
414 | spin_unlock_irqrestore(&priv->dma_lock, flags); | |
37784706 | 415 | |
425902f5 JG |
416 | timeout = wait_for_completion_timeout(&priv->dma_done, |
417 | msecs_to_jiffies(DMA_TIMEOUT_MS)); | |
37784706 | 418 | |
425902f5 JG |
419 | spin_lock_irqsave(&priv->dma_lock, flags); |
420 | zynq_fpga_set_irq(priv, 0); | |
421 | priv->cur_sg = NULL; | |
422 | spin_unlock_irqrestore(&priv->dma_lock, flags); | |
37784706 MF |
423 | |
424 | intr_status = zynq_fpga_read(priv, INT_STS_OFFSET); | |
425902f5 JG |
425 | zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK); |
426 | ||
427 | /* There doesn't seem to be a way to force cancel any DMA, so if | |
428 | * something went wrong we are relying on the hardware to have halted | |
429 | * the DMA before we get here, if there was we could use | |
430 | * wait_for_completion_interruptible too. | |
431 | */ | |
37784706 | 432 | |
6b45e0f2 JG |
433 | if (intr_status & IXR_ERROR_FLAGS_MASK) { |
434 | why = "DMA reported error"; | |
435 | err = -EIO; | |
436 | goto out_report; | |
437 | } | |
438 | ||
425902f5 JG |
439 | if (priv->cur_sg || |
440 | !((intr_status & IXR_D_P_DONE_MASK) == IXR_D_P_DONE_MASK)) { | |
441 | if (timeout == 0) | |
442 | why = "DMA timed out"; | |
443 | else | |
444 | why = "DMA did not complete"; | |
6b45e0f2 JG |
445 | err = -EIO; |
446 | goto out_report; | |
37784706 MF |
447 | } |
448 | ||
6b45e0f2 JG |
449 | err = 0; |
450 | goto out_clk; | |
451 | ||
452 | out_report: | |
453 | dev_err(&mgr->dev, | |
454 | "%s: INT_STS:0x%x CTRL:0x%x LOCK:0x%x INT_MASK:0x%x STATUS:0x%x MCTRL:0x%x\n", | |
455 | why, | |
456 | intr_status, | |
457 | zynq_fpga_read(priv, CTRL_OFFSET), | |
458 | zynq_fpga_read(priv, LOCK_OFFSET), | |
459 | zynq_fpga_read(priv, INT_MASK_OFFSET), | |
460 | zynq_fpga_read(priv, STATUS_OFFSET), | |
461 | zynq_fpga_read(priv, MCTRL_OFFSET)); | |
462 | ||
463 | out_clk: | |
37784706 MF |
464 | clk_disable(priv->clk); |
465 | ||
466 | out_free: | |
425902f5 | 467 | dma_unmap_sg(mgr->dev.parent, sgt->sgl, sgt->nents, DMA_TO_DEVICE); |
37784706 MF |
468 | return err; |
469 | } | |
470 | ||
1df2865f AT |
471 | static int zynq_fpga_ops_write_complete(struct fpga_manager *mgr, |
472 | struct fpga_image_info *info) | |
37784706 MF |
473 | { |
474 | struct zynq_fpga_priv *priv = mgr->priv; | |
475 | int err; | |
476 | u32 intr_status; | |
477 | ||
478 | err = clk_enable(priv->clk); | |
479 | if (err) | |
480 | return err; | |
481 | ||
482 | err = zynq_fpga_poll_timeout(priv, INT_STS_OFFSET, intr_status, | |
483 | intr_status & IXR_PCFG_DONE_MASK, | |
484 | INIT_POLL_DELAY, | |
485 | INIT_POLL_TIMEOUT); | |
486 | ||
487 | clk_disable(priv->clk); | |
488 | ||
489 | if (err) | |
490 | return err; | |
491 | ||
492 | /* for the partial reconfig case we didn't touch the level shifters */ | |
1df2865f | 493 | if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) { |
37784706 MF |
494 | /* enable level shifters from PL to PS */ |
495 | regmap_write(priv->slcr, SLCR_LVL_SHFTR_EN_OFFSET, | |
496 | LVL_SHFTR_ENABLE_PL_TO_PS); | |
497 | ||
498 | /* deassert AXI interface resets */ | |
499 | regmap_write(priv->slcr, SLCR_FPGA_RST_CTRL_OFFSET, | |
500 | FPGA_RST_NONE_MASK); | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | static enum fpga_mgr_states zynq_fpga_ops_state(struct fpga_manager *mgr) | |
507 | { | |
508 | int err; | |
509 | u32 intr_status; | |
510 | struct zynq_fpga_priv *priv; | |
511 | ||
512 | priv = mgr->priv; | |
513 | ||
514 | err = clk_enable(priv->clk); | |
515 | if (err) | |
516 | return FPGA_MGR_STATE_UNKNOWN; | |
517 | ||
518 | intr_status = zynq_fpga_read(priv, INT_STS_OFFSET); | |
519 | clk_disable(priv->clk); | |
520 | ||
521 | if (intr_status & IXR_PCFG_DONE_MASK) | |
522 | return FPGA_MGR_STATE_OPERATING; | |
523 | ||
524 | return FPGA_MGR_STATE_UNKNOWN; | |
525 | } | |
526 | ||
527 | static const struct fpga_manager_ops zynq_fpga_ops = { | |
b496df86 | 528 | .initial_header_size = 128, |
37784706 MF |
529 | .state = zynq_fpga_ops_state, |
530 | .write_init = zynq_fpga_ops_write_init, | |
425902f5 | 531 | .write_sg = zynq_fpga_ops_write, |
37784706 MF |
532 | .write_complete = zynq_fpga_ops_write_complete, |
533 | }; | |
534 | ||
535 | static int zynq_fpga_probe(struct platform_device *pdev) | |
536 | { | |
537 | struct device *dev = &pdev->dev; | |
538 | struct zynq_fpga_priv *priv; | |
539 | struct resource *res; | |
540 | int err; | |
541 | ||
542 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
543 | if (!priv) | |
544 | return -ENOMEM; | |
425902f5 | 545 | spin_lock_init(&priv->dma_lock); |
37784706 | 546 | |
37784706 MF |
547 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
548 | priv->io_base = devm_ioremap_resource(dev, res); | |
549 | if (IS_ERR(priv->io_base)) | |
550 | return PTR_ERR(priv->io_base); | |
551 | ||
552 | priv->slcr = syscon_regmap_lookup_by_phandle(dev->of_node, | |
553 | "syscon"); | |
554 | if (IS_ERR(priv->slcr)) { | |
1930c286 | 555 | dev_err(dev, "unable to get zynq-slcr regmap\n"); |
37784706 MF |
556 | return PTR_ERR(priv->slcr); |
557 | } | |
558 | ||
559 | init_completion(&priv->dma_done); | |
560 | ||
561 | priv->irq = platform_get_irq(pdev, 0); | |
562 | if (priv->irq < 0) { | |
1930c286 | 563 | dev_err(dev, "No IRQ available\n"); |
37784706 MF |
564 | return priv->irq; |
565 | } | |
566 | ||
37784706 MF |
567 | priv->clk = devm_clk_get(dev, "ref_clk"); |
568 | if (IS_ERR(priv->clk)) { | |
1930c286 | 569 | dev_err(dev, "input clock not found\n"); |
37784706 MF |
570 | return PTR_ERR(priv->clk); |
571 | } | |
572 | ||
573 | err = clk_prepare_enable(priv->clk); | |
574 | if (err) { | |
1930c286 | 575 | dev_err(dev, "unable to enable clock\n"); |
37784706 MF |
576 | return err; |
577 | } | |
578 | ||
579 | /* unlock the device */ | |
580 | zynq_fpga_write(priv, UNLOCK_OFFSET, UNLOCK_MASK); | |
581 | ||
6b45e0f2 | 582 | zynq_fpga_set_irq(priv, 0); |
340c0c53 JG |
583 | zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK); |
584 | err = devm_request_irq(dev, priv->irq, zynq_fpga_isr, 0, dev_name(dev), | |
585 | priv); | |
586 | if (err) { | |
587 | dev_err(dev, "unable to request IRQ\n"); | |
588 | clk_disable_unprepare(priv->clk); | |
589 | return err; | |
590 | } | |
591 | ||
37784706 MF |
592 | clk_disable(priv->clk); |
593 | ||
594 | err = fpga_mgr_register(dev, "Xilinx Zynq FPGA Manager", | |
595 | &zynq_fpga_ops, priv); | |
596 | if (err) { | |
1930c286 | 597 | dev_err(dev, "unable to register FPGA manager\n"); |
6376931b | 598 | clk_unprepare(priv->clk); |
37784706 MF |
599 | return err; |
600 | } | |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
605 | static int zynq_fpga_remove(struct platform_device *pdev) | |
606 | { | |
607 | struct zynq_fpga_priv *priv; | |
28f98a12 | 608 | struct fpga_manager *mgr; |
37784706 | 609 | |
28f98a12 MF |
610 | mgr = platform_get_drvdata(pdev); |
611 | priv = mgr->priv; | |
37784706 | 612 | |
28f98a12 | 613 | fpga_mgr_unregister(&pdev->dev); |
37784706 | 614 | |
6376931b | 615 | clk_unprepare(priv->clk); |
37784706 MF |
616 | |
617 | return 0; | |
618 | } | |
619 | ||
620 | #ifdef CONFIG_OF | |
621 | static const struct of_device_id zynq_fpga_of_match[] = { | |
622 | { .compatible = "xlnx,zynq-devcfg-1.0", }, | |
623 | {}, | |
624 | }; | |
625 | ||
626 | MODULE_DEVICE_TABLE(of, zynq_fpga_of_match); | |
627 | #endif | |
628 | ||
629 | static struct platform_driver zynq_fpga_driver = { | |
630 | .probe = zynq_fpga_probe, | |
631 | .remove = zynq_fpga_remove, | |
632 | .driver = { | |
633 | .name = "zynq_fpga_manager", | |
634 | .of_match_table = of_match_ptr(zynq_fpga_of_match), | |
635 | }, | |
636 | }; | |
637 | ||
638 | module_platform_driver(zynq_fpga_driver); | |
639 | ||
640 | MODULE_AUTHOR("Moritz Fischer <moritz.fischer@ettus.com>"); | |
641 | MODULE_AUTHOR("Michal Simek <michal.simek@xilinx.com>"); | |
642 | MODULE_DESCRIPTION("Xilinx Zynq FPGA Manager"); | |
643 | MODULE_LICENSE("GPL v2"); |