drivers/fpga/socfpga.c

   1 /*
   2  * Copyright (C) 2012 Altera Corporation <www.altera.com>
   3  * All rights reserved.
   4  *
   5  * SPDX-License-Identifier:     BSD-3-Clause
   6  */
   7
   8 #include <common.h>
   9 #include <asm/io.h>
  10 #include <linux/errno.h>
  11 #include <asm/arch/fpga_manager.h>
  12 #include <asm/arch/reset_manager.h>
  13 #include <asm/arch/system_manager.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 /* Timeout count */
  18 #define FPGA_TIMEOUT_CNT                0x1000000
  19
  20 static struct socfpga_fpga_manager *fpgamgr_regs =
  21         (struct socfpga_fpga_manager *)SOCFPGA_FPGAMGRREGS_ADDRESS;
  22
  23 int fpgamgr_dclkcnt_set(unsigned long cnt)
  24 {
  25         unsigned long i;
  26
  27         /* Clear any existing done status */
  28         if (readl(&fpgamgr_regs->dclkstat))
  29                 writel(0x1, &fpgamgr_regs->dclkstat);
  30
  31         /* Write the dclkcnt */
  32         writel(cnt, &fpgamgr_regs->dclkcnt);
  33
  34         /* Wait till the dclkcnt done */
  35         for (i = 0; i < FPGA_TIMEOUT_CNT; i++) {
  36                 if (!readl(&fpgamgr_regs->dclkstat))
  37                         continue;
  38
  39                 writel(0x1, &fpgamgr_regs->dclkstat);
  40                 return 0;
  41         }
  42
  43         return -ETIMEDOUT;
  44 }
  45
  46 /* Write the RBF data to FPGA Manager */
  47 void fpgamgr_program_write(const void *rbf_data, size_t rbf_size)
  48 {
  49         uint32_t src = (uint32_t)rbf_data;
  50         uint32_t dst = SOCFPGA_FPGAMGRDATA_ADDRESS;
  51
  52         /* Number of loops for 32-byte long copying. */
  53         uint32_t loops32 = rbf_size / 32;
  54         /* Number of loops for 4-byte long copying + trailing bytes */
  55         uint32_t loops4 = DIV_ROUND_UP(rbf_size % 32, 4);
  56
  57         asm volatile(
  58                 "1:     ldmia   %0!,    {r0-r7}\n"
  59                 "       stmia   %1!,    {r0-r7}\n"
  60                 "       sub     %1,     #32\n"
  61                 "       subs    %2,     #1\n"
  62                 "       bne     1b\n"
  63                 "       cmp     %3,     #0\n"
  64                 "       beq     3f\n"
  65                 "2:     ldr     %2,     [%0],   #4\n"
  66                 "       str     %2,     [%1]\n"
  67                 "       subs    %3,     #1\n"
  68                 "       bne     2b\n"
  69                 "3:     nop\n"
  70                 : "+r"(src), "+r"(dst), "+r"(loops32), "+r"(loops4) :
  71                 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "cc");
  72 }
  73