xref: /openbmc/u-boot/drivers/fpga/zynqmppl.c (revision a3b36c84)
1 /*
2  * (C) Copyright 2015 - 2016, Xilinx, Inc,
3  * Michal Simek <michal.simek@xilinx.com>
4  * Siva Durga Prasad <siva.durga.paladugu@xilinx.com>
5  *
6  * SPDX-License-Identifier:	GPL-2.0
7  */
8 
9 #include <console.h>
10 #include <common.h>
11 #include <zynqmppl.h>
12 #include <linux/sizes.h>
13 #include <asm/arch/sys_proto.h>
14 
15 #define DUMMY_WORD	0xffffffff
16 
17 /* Xilinx binary format header */
18 static const u32 bin_format[] = {
19 	DUMMY_WORD, /* Dummy words */
20 	DUMMY_WORD,
21 	DUMMY_WORD,
22 	DUMMY_WORD,
23 	DUMMY_WORD,
24 	DUMMY_WORD,
25 	DUMMY_WORD,
26 	DUMMY_WORD,
27 	DUMMY_WORD,
28 	DUMMY_WORD,
29 	DUMMY_WORD,
30 	DUMMY_WORD,
31 	DUMMY_WORD,
32 	DUMMY_WORD,
33 	DUMMY_WORD,
34 	DUMMY_WORD,
35 	0x000000bb, /* Sync word */
36 	0x11220044, /* Sync word */
37 	DUMMY_WORD,
38 	DUMMY_WORD,
39 	0xaa995566, /* Sync word */
40 };
41 
42 #define SWAP_NO		1
43 #define SWAP_DONE	2
44 
45 /*
46  * Load the whole word from unaligned buffer
47  * Keep in your mind that it is byte loading on little-endian system
48  */
49 static u32 load_word(const void *buf, u32 swap)
50 {
51 	u32 word = 0;
52 	u8 *bitc = (u8 *)buf;
53 	int p;
54 
55 	if (swap == SWAP_NO) {
56 		for (p = 0; p < 4; p++) {
57 			word <<= 8;
58 			word |= bitc[p];
59 		}
60 	} else {
61 		for (p = 3; p >= 0; p--) {
62 			word <<= 8;
63 			word |= bitc[p];
64 		}
65 	}
66 
67 	return word;
68 }
69 
70 static u32 check_header(const void *buf)
71 {
72 	u32 i, pattern;
73 	int swap = SWAP_NO;
74 	u32 *test = (u32 *)buf;
75 
76 	debug("%s: Let's check bitstream header\n", __func__);
77 
78 	/* Checking that passing bin is not a bitstream */
79 	for (i = 0; i < ARRAY_SIZE(bin_format); i++) {
80 		pattern = load_word(&test[i], swap);
81 
82 		/*
83 		 * Bitstreams in binary format are swapped
84 		 * compare to regular bistream.
85 		 * Do not swap dummy word but if swap is done assume
86 		 * that parsing buffer is binary format
87 		 */
88 		if ((__swab32(pattern) != DUMMY_WORD) &&
89 		    (__swab32(pattern) == bin_format[i])) {
90 			swap = SWAP_DONE;
91 			debug("%s: data swapped - let's swap\n", __func__);
92 		}
93 
94 		debug("%s: %d/%px: pattern %x/%x bin_format\n", __func__, i,
95 		      &test[i], pattern, bin_format[i]);
96 	}
97 	debug("%s: Found bitstream header at %px %s swapinng\n", __func__,
98 	      buf, swap == SWAP_NO ? "without" : "with");
99 
100 	return swap;
101 }
102 
103 static void *check_data(u8 *buf, size_t bsize, u32 *swap)
104 {
105 	u32 word, p = 0; /* possition */
106 
107 	/* Because buf doesn't need to be aligned let's read it by chars */
108 	for (p = 0; p < bsize; p++) {
109 		word = load_word(&buf[p], SWAP_NO);
110 		debug("%s: word %x %x/%px\n", __func__, word, p, &buf[p]);
111 
112 		/* Find the first bitstream dummy word */
113 		if (word == DUMMY_WORD) {
114 			debug("%s: Found dummy word at position %x/%px\n",
115 			      __func__, p, &buf[p]);
116 			*swap = check_header(&buf[p]);
117 			if (*swap) {
118 				/* FIXME add full bitstream checking here */
119 				return &buf[p];
120 			}
121 		}
122 		/* Loop can be huge - support CTRL + C */
123 		if (ctrlc())
124 			return NULL;
125 	}
126 	return NULL;
127 }
128 
129 static ulong zynqmp_align_dma_buffer(u32 *buf, u32 len, u32 swap)
130 {
131 	u32 *new_buf;
132 	u32 i;
133 
134 	if ((ulong)buf != ALIGN((ulong)buf, ARCH_DMA_MINALIGN)) {
135 		new_buf = (u32 *)ALIGN((ulong)buf, ARCH_DMA_MINALIGN);
136 
137 		/*
138 		 * This might be dangerous but permits to flash if
139 		 * ARCH_DMA_MINALIGN is greater than header size
140 		 */
141 		if (new_buf > (u32 *)buf) {
142 			debug("%s: Aligned buffer is after buffer start\n",
143 			      __func__);
144 			new_buf -= ARCH_DMA_MINALIGN;
145 		}
146 		printf("%s: Align buffer at %px to %px(swap %d)\n", __func__,
147 		       buf, new_buf, swap);
148 
149 		for (i = 0; i < (len/4); i++)
150 			new_buf[i] = load_word(&buf[i], swap);
151 
152 		buf = new_buf;
153 	} else if (swap != SWAP_DONE) {
154 		/* For bitstream which are aligned */
155 		u32 *new_buf = (u32 *)buf;
156 
157 		printf("%s: Bitstream is not swapped(%d) - swap it\n", __func__,
158 		       swap);
159 
160 		for (i = 0; i < (len/4); i++)
161 			new_buf[i] = load_word(&buf[i], swap);
162 	}
163 
164 	return (ulong)buf;
165 }
166 
167 static int zynqmp_validate_bitstream(xilinx_desc *desc, const void *buf,
168 				   size_t bsize, u32 blocksize, u32 *swap)
169 {
170 	ulong *buf_start;
171 	ulong diff;
172 
173 	buf_start = check_data((u8 *)buf, blocksize, swap);
174 
175 	if (!buf_start)
176 		return FPGA_FAIL;
177 
178 	/* Check if data is postpone from start */
179 	diff = (ulong)buf_start - (ulong)buf;
180 	if (diff) {
181 		printf("%s: Bitstream is not validated yet (diff %lx)\n",
182 		       __func__, diff);
183 		return FPGA_FAIL;
184 	}
185 
186 	if ((ulong)buf < SZ_1M) {
187 		printf("%s: Bitstream has to be placed up to 1MB (%px)\n",
188 		       __func__, buf);
189 		return FPGA_FAIL;
190 	}
191 
192 	return 0;
193 }
194 
195 static int zynqmp_load(xilinx_desc *desc, const void *buf, size_t bsize,
196 		     bitstream_type bstype)
197 {
198 	u32 swap;
199 	ulong bin_buf;
200 	int ret;
201 	u32 buf_lo, buf_hi;
202 	u32 ret_payload[PAYLOAD_ARG_CNT];
203 
204 	if (zynqmp_validate_bitstream(desc, buf, bsize, bsize, &swap))
205 		return FPGA_FAIL;
206 
207 	bin_buf = zynqmp_align_dma_buffer((u32 *)buf, bsize, swap);
208 
209 	debug("%s called!\n", __func__);
210 	flush_dcache_range(bin_buf, bin_buf + bsize);
211 
212 	if (bsize % 4)
213 		bsize = bsize / 4 + 1;
214 	else
215 		bsize = bsize / 4;
216 
217 	buf_lo = (u32)bin_buf;
218 	buf_hi = upper_32_bits(bin_buf);
219 	ret = invoke_smc(ZYNQMP_SIP_SVC_PM_FPGA_LOAD, buf_lo, buf_hi, bsize,
220 			 bstype, ret_payload);
221 	if (ret)
222 		debug("PL FPGA LOAD fail\n");
223 
224 	return ret;
225 }
226 
227 struct xilinx_fpga_op zynqmp_op = {
228 	.load = zynqmp_load,
229 };
230