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fpga: xilinx: Simplify load/dump/info function handling
[karo-tx-uboot.git] / drivers / fpga / zynqpl.c
1 /*
2  * (C) Copyright 2012-2013, Xilinx, Michal Simek
3  *
4  * (C) Copyright 2012
5  * Joe Hershberger <joe.hershberger@ni.com>
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9
10 #include <common.h>
11 #include <asm/io.h>
12 #include <zynqpl.h>
13 #include <linux/sizes.h>
14 #include <asm/arch/hardware.h>
15 #include <asm/arch/sys_proto.h>
16
17 #define DEVCFG_CTRL_PCFG_PROG_B         0x40000000
18 #define DEVCFG_ISR_FATAL_ERROR_MASK     0x00740040
19 #define DEVCFG_ISR_ERROR_FLAGS_MASK     0x00340840
20 #define DEVCFG_ISR_RX_FIFO_OV           0x00040000
21 #define DEVCFG_ISR_DMA_DONE             0x00002000
22 #define DEVCFG_ISR_PCFG_DONE            0x00000004
23 #define DEVCFG_STATUS_DMA_CMD_Q_F       0x80000000
24 #define DEVCFG_STATUS_DMA_CMD_Q_E       0x40000000
25 #define DEVCFG_STATUS_DMA_DONE_CNT_MASK 0x30000000
26 #define DEVCFG_STATUS_PCFG_INIT         0x00000010
27 #define DEVCFG_MCTRL_PCAP_LPBK          0x00000010
28 #define DEVCFG_MCTRL_RFIFO_FLUSH        0x00000002
29 #define DEVCFG_MCTRL_WFIFO_FLUSH        0x00000001
30
31 #ifndef CONFIG_SYS_FPGA_WAIT
32 #define CONFIG_SYS_FPGA_WAIT CONFIG_SYS_HZ/100  /* 10 ms */
33 #endif
34
35 #ifndef CONFIG_SYS_FPGA_PROG_TIME
36 #define CONFIG_SYS_FPGA_PROG_TIME       (CONFIG_SYS_HZ * 4) /* 4 s */
37 #endif
38
39 static int zynq_info(xilinx_desc *desc)
40 {
41         return FPGA_SUCCESS;
42 }
43
44 #define DUMMY_WORD      0xffffffff
45
46 /* Xilinx binary format header */
47 static const u32 bin_format[] = {
48         DUMMY_WORD, /* Dummy words */
49         DUMMY_WORD,
50         DUMMY_WORD,
51         DUMMY_WORD,
52         DUMMY_WORD,
53         DUMMY_WORD,
54         DUMMY_WORD,
55         DUMMY_WORD,
56         0x000000bb, /* Sync word */
57         0x11220044, /* Sync word */
58         DUMMY_WORD,
59         DUMMY_WORD,
60         0xaa995566, /* Sync word */
61 };
62
63 #define SWAP_NO         1
64 #define SWAP_DONE       2
65
66 /*
67  * Load the whole word from unaligned buffer
68  * Keep in your mind that it is byte loading on little-endian system
69  */
70 static u32 load_word(const void *buf, u32 swap)
71 {
72         u32 word = 0;
73         u8 *bitc = (u8 *)buf;
74         int p;
75
76         if (swap == SWAP_NO) {
77                 for (p = 0; p < 4; p++) {
78                         word <<= 8;
79                         word |= bitc[p];
80                 }
81         } else {
82                 for (p = 3; p >= 0; p--) {
83                         word <<= 8;
84                         word |= bitc[p];
85                 }
86         }
87
88         return word;
89 }
90
91 static u32 check_header(const void *buf)
92 {
93         u32 i, pattern;
94         int swap = SWAP_NO;
95         u32 *test = (u32 *)buf;
96
97         debug("%s: Let's check bitstream header\n", __func__);
98
99         /* Checking that passing bin is not a bitstream */
100         for (i = 0; i < ARRAY_SIZE(bin_format); i++) {
101                 pattern = load_word(&test[i], swap);
102
103                 /*
104                  * Bitstreams in binary format are swapped
105                  * compare to regular bistream.
106                  * Do not swap dummy word but if swap is done assume
107                  * that parsing buffer is binary format
108                  */
109                 if ((__swab32(pattern) != DUMMY_WORD) &&
110                     (__swab32(pattern) == bin_format[i])) {
111                         pattern = __swab32(pattern);
112                         swap = SWAP_DONE;
113                         debug("%s: data swapped - let's swap\n", __func__);
114                 }
115
116                 debug("%s: %d/%x: pattern %x/%x bin_format\n", __func__, i,
117                       (u32)&test[i], pattern, bin_format[i]);
118                 if (pattern != bin_format[i]) {
119                         debug("%s: Bitstream is not recognized\n", __func__);
120                         return 0;
121                 }
122         }
123         debug("%s: Found bitstream header at %x %s swapinng\n", __func__,
124               (u32)buf, swap == SWAP_NO ? "without" : "with");
125
126         return swap;
127 }
128
129 static void *check_data(u8 *buf, size_t bsize, u32 *swap)
130 {
131         u32 word, p = 0; /* possition */
132
133         /* Because buf doesn't need to be aligned let's read it by chars */
134         for (p = 0; p < bsize; p++) {
135                 word = load_word(&buf[p], SWAP_NO);
136                 debug("%s: word %x %x/%x\n", __func__, word, p, (u32)&buf[p]);
137
138                 /* Find the first bitstream dummy word */
139                 if (word == DUMMY_WORD) {
140                         debug("%s: Found dummy word at position %x/%x\n",
141                               __func__, p, (u32)&buf[p]);
142                         *swap = check_header(&buf[p]);
143                         if (*swap) {
144                                 /* FIXME add full bitstream checking here */
145                                 return &buf[p];
146                         }
147                 }
148                 /* Loop can be huge - support CTRL + C */
149                 if (ctrlc())
150                         return 0;
151         }
152         return 0;
153 }
154
155 static int zynq_load(xilinx_desc *desc, const void *buf, size_t bsize)
156 {
157         unsigned long ts; /* Timestamp */
158         u32 partialbit = 0;
159         u32 i, control, isr_status, status, swap, diff;
160         u32 *buf_start;
161
162         /* Detect if we are going working with partial or full bitstream */
163         if (bsize != desc->size) {
164                 printf("%s: Working with partial bitstream\n", __func__);
165                 partialbit = 1;
166         }
167
168         buf_start = check_data((u8 *)buf, bsize, &swap);
169         if (!buf_start)
170                 return FPGA_FAIL;
171
172         /* Check if data is postpone from start */
173         diff = (u32)buf_start - (u32)buf;
174         if (diff) {
175                 printf("%s: Bitstream is not validated yet (diff %x)\n",
176                        __func__, diff);
177                 return FPGA_FAIL;
178         }
179
180         if ((u32)buf < SZ_1M) {
181                 printf("%s: Bitstream has to be placed up to 1MB (%x)\n",
182                        __func__, (u32)buf);
183                 return FPGA_FAIL;
184         }
185
186         if ((u32)buf != ALIGN((u32)buf, ARCH_DMA_MINALIGN)) {
187                 u32 *new_buf = (u32 *)ALIGN((u32)buf, ARCH_DMA_MINALIGN);
188
189                 /*
190                  * This might be dangerous but permits to flash if
191                  * ARCH_DMA_MINALIGN is greater than header size
192                  */
193                 if (new_buf > buf_start) {
194                         debug("%s: Aligned buffer is after buffer start\n",
195                               __func__);
196                         new_buf -= ARCH_DMA_MINALIGN;
197                 }
198
199                 printf("%s: Align buffer at %x to %x(swap %d)\n", __func__,
200                        (u32)buf_start, (u32)new_buf, swap);
201
202                 for (i = 0; i < (bsize/4); i++)
203                         new_buf[i] = load_word(&buf_start[i], swap);
204
205                 swap = SWAP_DONE;
206                 buf = new_buf;
207         } else if (swap != SWAP_DONE) {
208                 /* For bitstream which are aligned */
209                 u32 *new_buf = (u32 *)buf;
210
211                 printf("%s: Bitstream is not swapped(%d) - swap it\n", __func__,
212                        swap);
213
214                 for (i = 0; i < (bsize/4); i++)
215                         new_buf[i] = load_word(&buf_start[i], swap);
216
217                 swap = SWAP_DONE;
218         }
219
220         /* Clear loopback bit */
221         clrbits_le32(&devcfg_base->mctrl, DEVCFG_MCTRL_PCAP_LPBK);
222
223         if (!partialbit) {
224                 zynq_slcr_devcfg_disable();
225
226                 /* Setting PCFG_PROG_B signal to high */
227                 control = readl(&devcfg_base->ctrl);
228                 writel(control | DEVCFG_CTRL_PCFG_PROG_B, &devcfg_base->ctrl);
229                 /* Setting PCFG_PROG_B signal to low */
230                 writel(control & ~DEVCFG_CTRL_PCFG_PROG_B, &devcfg_base->ctrl);
231
232                 /* Polling the PCAP_INIT status for Reset */
233                 ts = get_timer(0);
234                 while (readl(&devcfg_base->status) & DEVCFG_STATUS_PCFG_INIT) {
235                         if (get_timer(ts) > CONFIG_SYS_FPGA_WAIT) {
236                                 printf("%s: Timeout wait for INIT to clear\n",
237                                        __func__);
238                                 return FPGA_FAIL;
239                         }
240                 }
241
242                 /* Setting PCFG_PROG_B signal to high */
243                 writel(control | DEVCFG_CTRL_PCFG_PROG_B, &devcfg_base->ctrl);
244
245                 /* Polling the PCAP_INIT status for Set */
246                 ts = get_timer(0);
247                 while (!(readl(&devcfg_base->status) &
248                         DEVCFG_STATUS_PCFG_INIT)) {
249                         if (get_timer(ts) > CONFIG_SYS_FPGA_WAIT) {
250                                 printf("%s: Timeout wait for INIT to set\n",
251                                        __func__);
252                                 return FPGA_FAIL;
253                         }
254                 }
255         }
256
257         isr_status = readl(&devcfg_base->int_sts);
258
259         /* Clear it all, so if Boot ROM comes back, it can proceed */
260         writel(0xFFFFFFFF, &devcfg_base->int_sts);
261
262         if (isr_status & DEVCFG_ISR_FATAL_ERROR_MASK) {
263                 debug("%s: Fatal errors in PCAP 0x%X\n", __func__, isr_status);
264
265                 /* If RX FIFO overflow, need to flush RX FIFO first */
266                 if (isr_status & DEVCFG_ISR_RX_FIFO_OV) {
267                         writel(DEVCFG_MCTRL_RFIFO_FLUSH, &devcfg_base->mctrl);
268                         writel(0xFFFFFFFF, &devcfg_base->int_sts);
269                 }
270                 return FPGA_FAIL;
271         }
272
273         status = readl(&devcfg_base->status);
274
275         debug("%s: Status = 0x%08X\n", __func__, status);
276
277         if (status & DEVCFG_STATUS_DMA_CMD_Q_F) {
278                 debug("%s: Error: device busy\n", __func__);
279                 return FPGA_FAIL;
280         }
281
282         debug("%s: Device ready\n", __func__);
283
284         if (!(status & DEVCFG_STATUS_DMA_CMD_Q_E)) {
285                 if (!(readl(&devcfg_base->int_sts) & DEVCFG_ISR_DMA_DONE)) {
286                         /* Error state, transfer cannot occur */
287                         debug("%s: ISR indicates error\n", __func__);
288                         return FPGA_FAIL;
289                 } else {
290                         /* Clear out the status */
291                         writel(DEVCFG_ISR_DMA_DONE, &devcfg_base->int_sts);
292                 }
293         }
294
295         if (status & DEVCFG_STATUS_DMA_DONE_CNT_MASK) {
296                 /* Clear the count of completed DMA transfers */
297                 writel(DEVCFG_STATUS_DMA_DONE_CNT_MASK, &devcfg_base->status);
298         }
299
300         debug("%s: Source = 0x%08X\n", __func__, (u32)buf);
301         debug("%s: Size = %zu\n", __func__, bsize);
302
303         /* flush(clean & invalidate) d-cache range buf */
304         flush_dcache_range((u32)buf, (u32)buf +
305                            roundup(bsize, ARCH_DMA_MINALIGN));
306
307         /* Set up the transfer */
308         writel((u32)buf | 1, &devcfg_base->dma_src_addr);
309         writel(0xFFFFFFFF, &devcfg_base->dma_dst_addr);
310         writel(bsize >> 2, &devcfg_base->dma_src_len);
311         writel(0, &devcfg_base->dma_dst_len);
312
313         isr_status = readl(&devcfg_base->int_sts);
314
315         /* Polling the PCAP_INIT status for Set */
316         ts = get_timer(0);
317         while (!(isr_status & DEVCFG_ISR_DMA_DONE)) {
318                 if (isr_status & DEVCFG_ISR_ERROR_FLAGS_MASK) {
319                         debug("%s: Error: isr = 0x%08X\n", __func__,
320                               isr_status);
321                         debug("%s: Write count = 0x%08X\n", __func__,
322                               readl(&devcfg_base->write_count));
323                         debug("%s: Read count = 0x%08X\n", __func__,
324                               readl(&devcfg_base->read_count));
325
326                         return FPGA_FAIL;
327                 }
328                 if (get_timer(ts) > CONFIG_SYS_FPGA_PROG_TIME) {
329                         printf("%s: Timeout wait for DMA to complete\n",
330                                __func__);
331                         return FPGA_FAIL;
332                 }
333                 isr_status = readl(&devcfg_base->int_sts);
334         }
335
336         debug("%s: DMA transfer is done\n", __func__);
337
338         /* Check FPGA configuration completion */
339         ts = get_timer(0);
340         while (!(isr_status & DEVCFG_ISR_PCFG_DONE)) {
341                 if (get_timer(ts) > CONFIG_SYS_FPGA_WAIT) {
342                         printf("%s: Timeout wait for FPGA to config\n",
343                                __func__);
344                         return FPGA_FAIL;
345                 }
346                 isr_status = readl(&devcfg_base->int_sts);
347         }
348
349         debug("%s: FPGA config done\n", __func__);
350
351         /* Clear out the DMA status */
352         writel(DEVCFG_ISR_DMA_DONE, &devcfg_base->int_sts);
353
354         if (!partialbit)
355                 zynq_slcr_devcfg_enable();
356
357         return FPGA_SUCCESS;
358 }
359
360 static int zynq_dump(xilinx_desc *desc, const void *buf, size_t bsize)
361 {
362         return FPGA_FAIL;
363 }
364
365 struct xilinx_fpga_op zynq_op = {
366         .load = zynq_load,
367         .dump = zynq_dump,
368         .info = zynq_info,
369 };