board/matrix_vision/mvbc_p/fpga.c

   1 /*
   2  * (C) Copyright 2002
   3  * Rich Ireland, Enterasys Networks, rireland@enterasys.com.
   4  * Keith Outwater, keith_outwater@mvis.com.
   5  *
   6  * (C) Copyright 2008
   7  * Andre Schwarz, Matrix Vision GmbH, andre.schwarz@matrix-vision.de
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include <common.h>
  13 #include <ACEX1K.h>
  14 #include <command.h>
  15 #include "fpga.h"
  16 #include "mvbc_p.h"
  17
  18 #ifdef FPGA_DEBUG
  19 #define fpga_debug(fmt, args...)        printf("%s: "fmt, __func__, ##args)
  20 #else
  21 #define fpga_debug(fmt, args...)
  22 #endif
  23
  24 Altera_CYC2_Passive_Serial_fns altera_fns = {
  25         fpga_null_fn,
  26         fpga_config_fn,
  27         fpga_status_fn,
  28         fpga_done_fn,
  29         fpga_wr_fn,
  30         fpga_null_fn,
  31         fpga_null_fn,
  32 };
  33
  34 Altera_desc cyclone2 = {
  35         Altera_CYC2,
  36         passive_serial,
  37         Altera_EP2C8_SIZE,
  38         (void *) &altera_fns,
  39         NULL,
  40 };
  41
  42 DECLARE_GLOBAL_DATA_PTR;
  43
  44 int mvbc_p_init_fpga(void)
  45 {
  46         fpga_debug("Initialize FPGA interface\n");
  47         fpga_init();
  48         fpga_add(fpga_altera, &cyclone2);
  49         fpga_config_fn(0, 1, 0);
  50         udelay(60);
  51
  52         return 1;
  53 }
  54
  55 int fpga_null_fn(int cookie)
  56 {
  57         return 0;
  58 }
  59
  60 int fpga_config_fn(int assert, int flush, int cookie)
  61 {
  62         struct mpc5xxx_gpio *gpio = (struct mpc5xxx_gpio*)MPC5XXX_GPIO;
  63         u32 dvo = gpio->simple_dvo;
  64
  65         fpga_debug("SET config : %s\n", assert ? "low" : "high");
  66         if (assert)
  67                 dvo |= FPGA_CONFIG;
  68         else
  69                 dvo &= ~FPGA_CONFIG;
  70
  71         if (flush)
  72                 gpio->simple_dvo = dvo;
  73
  74         return assert;
  75 }
  76
  77 int fpga_done_fn(int cookie)
  78 {
  79         struct mpc5xxx_gpio *gpio = (struct mpc5xxx_gpio*)MPC5XXX_GPIO;
  80         int result = 0;
  81
  82         udelay(10);
  83         fpga_debug("CONF_DONE check ... ");
  84         if (gpio->simple_ival & FPGA_CONF_DONE) {
  85                 fpga_debug("high\n");
  86                 result = 1;
  87         } else
  88                 fpga_debug("low\n");
  89
  90         return result;
  91 }
  92
  93 int fpga_status_fn(int cookie)
  94 {
  95         struct mpc5xxx_gpio *gpio = (struct mpc5xxx_gpio*)MPC5XXX_GPIO;
  96         int result = 0;
  97
  98         fpga_debug("STATUS check ... ");
  99         if (gpio->sint_ival & FPGA_STATUS) {
 100                 fpga_debug("high\n");
 101                 result = 1;
 102         } else
 103                 fpga_debug("low\n");
 104
 105         return result;
 106 }
 107
 108 int fpga_clk_fn(int assert_clk, int flush, int cookie)
 109 {
 110         struct mpc5xxx_gpio *gpio = (struct mpc5xxx_gpio*)MPC5XXX_GPIO;
 111         u32 dvo = gpio->simple_dvo;
 112
 113         fpga_debug("CLOCK %s\n", assert_clk ? "high" : "low");
 114         if (assert_clk)
 115                 dvo |= FPGA_CCLK;
 116         else
 117                 dvo &= ~FPGA_CCLK;
 118
 119         if (flush)
 120                 gpio->simple_dvo = dvo;
 121
 122         return assert_clk;
 123 }
 124
 125 static inline int _write_fpga(u8 val)
 126 {
 127         int i;
 128         struct mpc5xxx_gpio *gpio = (struct mpc5xxx_gpio*)MPC5XXX_GPIO;
 129         u32 dvo = gpio->simple_dvo;
 130
 131         for (i=0; i<8; i++) {
 132                 dvo &= ~FPGA_CCLK;
 133                 gpio->simple_dvo = dvo;
 134                 dvo &= ~FPGA_DIN;
 135                 if (val & 1)
 136                         dvo |= FPGA_DIN;
 137                 gpio->simple_dvo = dvo;
 138                 dvo |= FPGA_CCLK;
 139                 gpio->simple_dvo = dvo;
 140                 val >>= 1;
 141         }
 142
 143         return 0;
 144 }
 145
 146 int fpga_wr_fn(const void *buf, size_t len, int flush, int cookie)
 147 {
 148         unsigned char *data = (unsigned char *) buf;
 149         int i;
 150
 151         fpga_debug("fpga_wr: buf %p / size %d\n", buf, len);
 152         for (i = 0; i < len; i++)
 153                 _write_fpga(data[i]);
 154         fpga_debug("\n");
 155
 156         return FPGA_SUCCESS;
 157 }