1 /* Blackfin General Purpose Timers (GPtimer) model 2 3 Copyright (C) 2010-2024 Free Software Foundation, Inc. 4 Contributed by Analog Devices, Inc. 5 6 This file is part of simulators. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 /* This must come before any other includes. */ 22 #include "defs.h" 23 24 #include "sim-main.h" 25 #include "devices.h" 26 #include "dv-bfin_gptimer.h" 27 28 /* XXX: This is merely a stub. */ 29 30 struct bfin_gptimer 31 { 32 /* This top portion matches common dv_bfin struct. */ 33 bu32 base; 34 struct hw *dma_master; 35 bool acked; 36 37 struct hw_event *handler; 38 char saved_byte; 39 int saved_count; 40 41 /* Order after here is important -- matches hardware MMR layout. */ 42 bu16 BFIN_MMR_16(config); 43 bu32 counter, period, width; 44 }; 45 #define mmr_base() offsetof(struct bfin_gptimer, config) 46 #define mmr_offset(mmr) (offsetof(struct bfin_gptimer, mmr) - mmr_base()) 47 48 static const char * const mmr_names[] = 49 { 50 "TIMER_CONFIG", "TIMER_COUNTER", "TIMER_PERIOD", "TIMER_WIDTH", 51 }; 52 #define mmr_name(off) mmr_names[(off) / 4] 53 54 static unsigned 55 bfin_gptimer_io_write_buffer (struct hw *me, const void *source, int space, 56 address_word addr, unsigned nr_bytes) 57 { 58 struct bfin_gptimer *gptimer = hw_data (me); 59 bu32 mmr_off; 60 bu32 value; 61 bu16 *value16p; 62 bu32 *value32p; 63 void *valuep; 64 65 /* Invalid access mode is higher priority than missing register. */ 66 if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, true)) 67 return 0; 68 69 if (nr_bytes == 4) 70 value = dv_load_4 (source); 71 else 72 value = dv_load_2 (source); 73 74 mmr_off = addr - gptimer->base; 75 valuep = (void *)((uintptr_t)gptimer + mmr_base() + mmr_off); 76 value16p = valuep; 77 value32p = valuep; 78 79 HW_TRACE_WRITE (); 80 81 switch (mmr_off) 82 { 83 case mmr_offset(config): 84 if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true)) 85 return 0; 86 *value16p = value; 87 break; 88 case mmr_offset(counter): 89 case mmr_offset(period): 90 case mmr_offset(width): 91 if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true)) 92 return 0; 93 *value32p = value; 94 break; 95 default: 96 dv_bfin_mmr_invalid (me, addr, nr_bytes, true); 97 return 0; 98 } 99 100 return nr_bytes; 101 } 102 103 static unsigned 104 bfin_gptimer_io_read_buffer (struct hw *me, void *dest, int space, 105 address_word addr, unsigned nr_bytes) 106 { 107 struct bfin_gptimer *gptimer = hw_data (me); 108 bu32 mmr_off; 109 bu16 *value16p; 110 bu32 *value32p; 111 void *valuep; 112 113 /* Invalid access mode is higher priority than missing register. */ 114 if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, false)) 115 return 0; 116 117 mmr_off = addr - gptimer->base; 118 valuep = (void *)((uintptr_t)gptimer + mmr_base() + mmr_off); 119 value16p = valuep; 120 value32p = valuep; 121 122 HW_TRACE_READ (); 123 124 switch (mmr_off) 125 { 126 case mmr_offset(config): 127 if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false)) 128 return 0; 129 dv_store_2 (dest, *value16p); 130 break; 131 case mmr_offset(counter): 132 case mmr_offset(period): 133 case mmr_offset(width): 134 if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false)) 135 return 0; 136 dv_store_4 (dest, *value32p); 137 break; 138 default: 139 dv_bfin_mmr_invalid (me, addr, nr_bytes, false); 140 return 0; 141 } 142 143 return nr_bytes; 144 } 145 146 static const struct hw_port_descriptor bfin_gptimer_ports[] = 147 { 148 { "stat", 0, 0, output_port, }, 149 { NULL, 0, 0, 0, }, 150 }; 151 152 static void 153 attach_bfin_gptimer_regs (struct hw *me, struct bfin_gptimer *gptimer) 154 { 155 address_word attach_address; 156 int attach_space; 157 unsigned attach_size; 158 reg_property_spec reg; 159 160 if (hw_find_property (me, "reg") == NULL) 161 hw_abort (me, "Missing \"reg\" property"); 162 163 if (!hw_find_reg_array_property (me, "reg", 0, ®)) 164 hw_abort (me, "\"reg\" property must contain three addr/size entries"); 165 166 hw_unit_address_to_attach_address (hw_parent (me), 167 ®.address, 168 &attach_space, &attach_address, me); 169 hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me); 170 171 if (attach_size != BFIN_MMR_GPTIMER_SIZE) 172 hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPTIMER_SIZE); 173 174 hw_attach_address (hw_parent (me), 175 0, attach_space, attach_address, attach_size, me); 176 177 gptimer->base = attach_address; 178 } 179 180 static void 181 bfin_gptimer_finish (struct hw *me) 182 { 183 struct bfin_gptimer *gptimer; 184 185 gptimer = HW_ZALLOC (me, struct bfin_gptimer); 186 187 set_hw_data (me, gptimer); 188 set_hw_io_read_buffer (me, bfin_gptimer_io_read_buffer); 189 set_hw_io_write_buffer (me, bfin_gptimer_io_write_buffer); 190 set_hw_ports (me, bfin_gptimer_ports); 191 192 attach_bfin_gptimer_regs (me, gptimer); 193 } 194 195 const struct hw_descriptor dv_bfin_gptimer_descriptor[] = 196 { 197 {"bfin_gptimer", bfin_gptimer_finish,}, 198 {NULL, NULL}, 199 }; 200
Indexes created Mon Mar 02 05:31:46 UTC 2026