drivers/fpga/zynqmppl.c

   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 };