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
  14 #define DUMMY_WORD      0xffffffff
  15
  16 /* Xilinx binary format header */
  17 static const u32 bin_format[] = {
  18         DUMMY_WORD, /* Dummy words */
  19         DUMMY_WORD,
  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         0x000000bb, /* Sync word */
  35         0x11220044, /* Sync word */
  36         DUMMY_WORD,
  37         DUMMY_WORD,
  38         0xaa995566, /* Sync word */
  39 };
  40
  41 #define SWAP_NO         1
  42 #define SWAP_DONE       2
  43
  44 /*
  45  * Load the whole word from unaligned buffer
  46  * Keep in your mind that it is byte loading on little-endian system
  47  */
  48 static u32 load_word(const void *buf, u32 swap)
  49 {
  50         u32 word = 0;
  51         u8 *bitc = (u8 *)buf;
  52         int p;
  53
  54         if (swap == SWAP_NO) {
  55                 for (p = 0; p < 4; p++) {
  56                         word <<= 8;
  57                         word |= bitc[p];
  58                 }
  59         } else {
  60                 for (p = 3; p >= 0; p--) {
  61                         word <<= 8;
  62                         word |= bitc[p];
  63                 }
  64         }
  65
  66         return word;
  67 }
  68
  69 static u32 check_header(const void *buf)
  70 {
  71         u32 i, pattern;
  72         int swap = SWAP_NO;
  73         u32 *test = (u32 *)buf;
  74
  75         debug("%s: Let's check bitstream header\n", __func__);
  76
  77         /* Checking that passing bin is not a bitstream */
  78         for (i = 0; i < ARRAY_SIZE(bin_format); i++) {
  79                 pattern = load_word(&test[i], swap);
  80
  81                 /*
  82                  * Bitstreams in binary format are swapped
  83                  * compare to regular bistream.
  84                  * Do not swap dummy word but if swap is done assume
  85                  * that parsing buffer is binary format
  86                  */
  87                 if ((__swab32(pattern) != DUMMY_WORD) &&
  88                     (__swab32(pattern) == bin_format[i])) {
  89                         swap = SWAP_DONE;
  90                         debug("%s: data swapped - let's swap\n", __func__);
  91                 }
  92
  93                 debug("%s: %d/%px: pattern %x/%x bin_format\n", __func__, i,
  94                       &test[i], pattern, bin_format[i]);
  95         }
  96         debug("%s: Found bitstream header at %px %s swapinng\n", __func__,
  97               buf, swap == SWAP_NO ? "without" : "with");
  98
  99         return swap;
 100 }
 101
 102 static void *check_data(u8 *buf, size_t bsize, u32 *swap)
 103 {
 104         u32 word, p = 0; /* possition */
 105
 106         /* Because buf doesn't need to be aligned let's read it by chars */
 107         for (p = 0; p < bsize; p++) {
 108                 word = load_word(&buf[p], SWAP_NO);
 109                 debug("%s: word %x %x/%px\n", __func__, word, p, &buf[p]);
 110
 111                 /* Find the first bitstream dummy word */
 112                 if (word == DUMMY_WORD) {
 113                         debug("%s: Found dummy word at position %x/%px\n",
 114                               __func__, p, &buf[p]);
 115                         *swap = check_header(&buf[p]);
 116                         if (*swap) {
 117                                 /* FIXME add full bitstream checking here */
 118                                 return &buf[p];
 119                         }
 120                 }
 121                 /* Loop can be huge - support CTRL + C */
 122                 if (ctrlc())
 123                         return NULL;
 124         }
 125         return NULL;
 126 }
 127
 128 static ulong zynqmp_align_dma_buffer(u32 *buf, u32 len, u32 swap)
 129 {
 130         u32 *new_buf;
 131         u32 i;
 132
 133         if ((ulong)buf != ALIGN((ulong)buf, ARCH_DMA_MINALIGN)) {
 134                 new_buf = (u32 *)ALIGN((ulong)buf, ARCH_DMA_MINALIGN);
 135
 136                 /*
 137                  * This might be dangerous but permits to flash if
 138                  * ARCH_DMA_MINALIGN is greater than header size
 139                  */
 140                 if (new_buf > (u32 *)buf) {
 141                         debug("%s: Aligned buffer is after buffer start\n",
 142                               __func__);
 143                         new_buf -= ARCH_DMA_MINALIGN;
 144                 }
 145                 printf("%s: Align buffer at %px to %px(swap %d)\n", __func__,
 146                        buf, new_buf, swap);
 147
 148                 for (i = 0; i < (len/4); i++)
 149                         new_buf[i] = load_word(&buf[i], swap);
 150
 151                 buf = new_buf;
 152         } else if (swap != SWAP_DONE) {
 153                 /* For bitstream which are aligned */
 154                 u32 *new_buf = (u32 *)buf;
 155
 156                 printf("%s: Bitstream is not swapped(%d) - swap it\n", __func__,
 157                        swap);
 158
 159                 for (i = 0; i < (len/4); i++)
 160                         new_buf[i] = load_word(&buf[i], swap);
 161         }
 162
 163         return (ulong)buf;
 164 }
 165
 166 static int zynqmp_validate_bitstream(xilinx_desc *desc, const void *buf,
 167                                    size_t bsize, u32 blocksize, u32 *swap)
 168 {
 169         ulong *buf_start;
 170         ulong diff;
 171
 172         buf_start = check_data((u8 *)buf, blocksize, swap);
 173
 174         if (!buf_start)
 175                 return FPGA_FAIL;
 176
 177         /* Check if data is postpone from start */
 178         diff = (ulong)buf_start - (ulong)buf;
 179         if (diff) {
 180                 printf("%s: Bitstream is not validated yet (diff %lx)\n",
 181                        __func__, diff);
 182                 return FPGA_FAIL;
 183         }
 184
 185         if ((ulong)buf < SZ_1M) {
 186                 printf("%s: Bitstream has to be placed up to 1MB (%px)\n",
 187                        __func__, buf);
 188                 return FPGA_FAIL;
 189         }
 190
 191         return 0;
 192 }
 193
 194 static int invoke_smc(ulong id, ulong reg0, ulong reg1, ulong reg2)
 195 {
 196         struct pt_regs regs;
 197         regs.regs[0] = id;
 198         regs.regs[1] = reg0;
 199         regs.regs[2] = reg1;
 200         regs.regs[3] = reg2;
 201
 202         smc_call(&regs);
 203
 204         return regs.regs[0];
 205 }
 206
 207 static int zynqmp_load(xilinx_desc *desc, const void *buf, size_t bsize,
 208                      bitstream_type bstype)
 209 {
 210         u32 swap;
 211         ulong bin_buf, flags;
 212         int ret;
 213
 214         if (zynqmp_validate_bitstream(desc, buf, bsize, bsize, &swap))
 215                 return FPGA_FAIL;
 216
 217         bin_buf = zynqmp_align_dma_buffer((u32 *)buf, bsize, swap);
 218
 219         debug("%s called!\n", __func__);
 220         flush_dcache_range(bin_buf, bin_buf + bsize);
 221
 222         if (bsize % 4)
 223                 bsize = bsize / 4 + 1;
 224         else
 225                 bsize = bsize / 4;
 226
 227         flags = (u32)bsize | ((u64)bstype << 32);
 228
 229         ret = invoke_smc(ZYNQMP_SIP_SVC_PM_FPGA_LOAD, bin_buf, flags, 0);
 230         if (ret)
 231                 debug("PL FPGA LOAD fail\n");
 232
 233         return ret;
 234 }
 235
 236 struct xilinx_fpga_op zynqmp_op = {
 237         .load = zynqmp_load,
 238 };