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   1 /***************************************************************************
   2  *   Copyright (C) 2007-2010 by Øyvind Harboe                              *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  18  ***************************************************************************/
  19
  20 /* used to test manual mode */
  21 #define TEST_MANUAL() 0
  22 #define VERBOSE(a)
  23
  24 #if BUILD_ZY1000_MASTER
  25
  26 #define ZY1000_PEEK(a, b) do {b = *((volatile uint32_t *)(a)); } while (0)
  27 #define ZY1000_POKE(a, b) do {*((volatile uint32_t *)(a)) = b; } while (0)
  28 extern volatile void *zy1000_jtag_master;
  29 #define ZY1000_JTAG_BASE ((unsigned long)zy1000_jtag_master)
  30
  31 #else
  32
  33 /* redirect this to TCP/IP */
  34 #define ZY1000_JTAG_BASE 0
  35 extern void zy1000_tcpout(uint32_t address, uint32_t data);
  36 extern uint32_t zy1000_tcpin(uint32_t address);
  37 #define ZY1000_PEEK(a, b) b = zy1000_tcpin(a)
  38 #define ZY1000_POKE(a, b) zy1000_tcpout(a, b)
  39
  40 #endif
  41
  42 #if BUILD_ZY1000_MASTER
  43 /* FIFO empty? */
  44 static inline void waitIdle(void)
  45 {
  46         uint32_t empty;
  47         do {
  48                 ZY1000_PEEK(ZY1000_JTAG_BASE + 0x10, empty);
  49         } while ((empty & 0x100) == 0);
  50 }
  51
  52 static inline void zy1000_flush_readqueue(void)
  53 {
  54         /* Not used w/hardware fifo */
  55 }
  56 static inline void zy1000_flush_callbackqueue(void)
  57 {
  58         /* Not used w/hardware fifo */
  59 }
  60 #else
  61 extern void waitIdle(void);
  62 void zy1000_flush_readqueue(void);
  63 void zy1000_flush_callbackqueue(void);
  64 void zy1000_jtag_add_callback4(jtag_callback_t callback,
  65                 jtag_callback_data_t data0,
  66                 jtag_callback_data_t data1,
  67                 jtag_callback_data_t data2,
  68                 jtag_callback_data_t data3);
  69 void zy1000_jtag_add_callback(jtag_callback1_t callback, jtag_callback_data_t data0);
  70 #endif
  71
  72 static inline void waitQueue(void)
  73 {
  74 /*      waitIdle(); */
  75 }
  76
  77 static inline void sampleShiftRegister(void)
  78 {
  79 #if 0
  80         uint32_t dummy;
  81         waitIdle();
  82         ZY1000_PEEK(ZY1000_JTAG_BASE + 0xc, dummy);
  83 #endif
  84 }
  85
  86 static inline void setCurrentState(enum tap_state state)
  87 {
  88         uint32_t a;
  89         a = state;
  90         int repeat = 0;
  91         if (state == TAP_RESET) {
  92                 /* The FPGA nor we know the current state of the CPU TAP */
  93                 /* controller. This will move it to TAP for sure. */
  94                 /*  */
  95                 /* 5 should be enough here, 7 is what OpenOCD uses */
  96                 repeat = 7;
  97         }
  98         waitQueue();
  99         sampleShiftRegister();
 100         ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (repeat << 8) | (a << 4) | a);
 101
 102 }
 103
 104 /*
 105  * Enter state and cause repeat transitions *out* of that state. So if the endState != state, then
 106  * the transition from state to endState counts as a transition out of state.
 107  */
 108 static inline void shiftValueInner(const enum tap_state state,
 109         const enum tap_state endState,
 110         int repeat,
 111         uint32_t value)
 112 {
 113         uint32_t a, b;
 114         a = state;
 115         b = endState;
 116         waitQueue();
 117         sampleShiftRegister();
 118         ZY1000_POKE(ZY1000_JTAG_BASE + 0xc, value);
 119 #if 1
 120 #if TEST_MANUAL()
 121         if ((state == TAP_DRSHIFT) && (endState != TAP_DRSHIFT)) {
 122                 int i;
 123                 setCurrentState(state);
 124                 for (i = 0; i < repeat; i++) {
 125                         int tms;
 126                         tms = 0;
 127                         if ((i == repeat-1) && (state != endState))
 128                                 tms = 1;
 129                                         /* shift out value */
 130                         waitIdle();
 131                         ZY1000_POKE(ZY1000_JTAG_BASE + 0x28, (((value >> i)&1) << 1) | tms);
 132                 }
 133                 waitIdle();
 134                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x28, 0);
 135                 waitIdle();
 136                 /* ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, TAP_DRSHIFT); // set this state and things
 137                  * break => expected */
 138                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, TAP_DRPAUSE);      /* set this and things will
 139                                                                          * work => expected. Not
 140                                                                          * setting this is not
 141                                                                          * sufficient to make things
 142                                                                          * break. */
 143                 setCurrentState(endState);
 144         } else
 145                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (repeat << 8) | (a << 4) | b);
 146
 147 #else
 148         /* fast version */
 149         ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (repeat << 8) | (a << 4) | b);
 150 #endif
 151 #else
 152         /* maximum debug version */
 153         if ((repeat > 0) && ((state == TAP_DRSHIFT) || (state == TAP_SI))) {
 154                 int i;
 155                 /* sample shift register for every bit. */
 156                 for (i = 0; i < repeat-1; i++) {
 157                         sampleShiftRegister();
 158                         ZY1000_POKE(ZY1000_JTAG_BASE + 0xc, value >> i);
 159                         ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (1 << 8) | (a << 4) | a);
 160                 }
 161                 sampleShiftRegister();
 162                 ZY1000_POKE(ZY1000_JTAG_BASE + 0xc, value >> (repeat-1));
 163                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (1 << 8) | (a << 4) | b);
 164         } else {
 165                 sampleShiftRegister();
 166                 ZY1000_POKE(ZY1000_JTAG_BASE + 0x8, (repeat << 8) | (a << 4) | b);
 167         }
 168         sampleShiftRegister();
 169 #endif
 170 }
 171
 172 static inline void interface_jtag_add_dr_out_core(struct jtag_tap *target_tap,
 173         int num_fields,
 174         const int *num_bits,
 175         const uint32_t *value,
 176         enum tap_state end_state)
 177 {
 178         enum tap_state pause_state = TAP_DRSHIFT;
 179
 180         struct jtag_tap *tap, *nextTap;
 181         for (tap = jtag_tap_next_enabled(NULL); tap != NULL; tap = nextTap) {
 182                 nextTap = jtag_tap_next_enabled(tap);
 183                 if (nextTap == NULL)
 184                         pause_state = end_state;
 185                 if (tap == target_tap) {
 186                         int j;
 187                         for (j = 0; j < (num_fields-1); j++)
 188                                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, num_bits[j], value[j]);
 189                         shiftValueInner(TAP_DRSHIFT, pause_state, num_bits[j], value[j]);
 190                 } else {
 191                         /* program the scan field to 1 bit length, and ignore it's value */
 192                         shiftValueInner(TAP_DRSHIFT, pause_state, 1, 0);
 193                 }
 194         }
 195 }
 196
 197 static inline void interface_jtag_add_dr_out(struct jtag_tap *target_tap,
 198         int num_fields,
 199         const int *num_bits,
 200         const uint32_t *value,
 201         enum tap_state end_state)
 202 {
 203
 204         int singletap = (jtag_tap_next_enabled(jtag_tap_next_enabled(NULL)) == NULL);
 205         if ((singletap) && (num_fields == 3)) {
 206                 /* used by embeddedice_write_reg_inner() */
 207                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, num_bits[0], value[0]);
 208                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, num_bits[1], value[1]);
 209                 shiftValueInner(TAP_DRSHIFT, end_state, num_bits[2], value[2]);
 210         } else if ((singletap) && (num_fields == 2)) {
 211                 /* used by arm7 code */
 212                 shiftValueInner(TAP_DRSHIFT, TAP_DRSHIFT, num_bits[0], value[0]);
 213                 shiftValueInner(TAP_DRSHIFT, end_state, num_bits[1], value[1]);
 214         } else
 215                 interface_jtag_add_dr_out_core(target_tap, num_fields, num_bits, value, end_state);
 216 }
 217
 218 #if BUILD_ZY1000_MASTER
 219 #define interface_jtag_add_callback(callback, in) callback(in)
 220 #define interface_jtag_add_callback4(callback, in, data1, data2, \
 221                 data3) jtag_set_error(callback(in, data1, data2, data3))
 222 #else
 223 #define interface_jtag_add_callback(callback, in) zy1000_jtag_add_callback(callback, in)
 224 #define interface_jtag_add_callback4(callback, in, data1, data2, data3) zy1000_jtag_add_callback4( \
 225         callback, \
 226         in, \
 227         data1, \
 228         data2, \
 229         data3)
 230 #endif