LXR uboot/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 */
  17static 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 */
  48static 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
  69static 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
 102static 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
 128static 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
 166static 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
 194static 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
 207static 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
 236struct xilinx_fpga_op zynqmp_op = {
 237        .load = zynqmp_load,
 238};
 239