1 /* Blackfin Real Time Clock (RTC) model. 2 3 Copyright (C) 2010-2014 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 #include "config.h" 22 23 #include <time.h> 24 #include "sim-main.h" 25 #include "dv-sockser.h" 26 #include "devices.h" 27 #include "dv-bfin_rtc.h" 28 29 /* XXX: This read-only stub setup is based on host system clock. */ 30 31 struct bfin_rtc 32 { 33 bu32 base; 34 bu32 stat_shadow; 35 36 /* Order after here is important -- matches hardware MMR layout. */ 37 bu32 stat; 38 bu16 BFIN_MMR_16(ictl); 39 bu16 BFIN_MMR_16(istat); 40 bu16 BFIN_MMR_16(swcnt); 41 bu32 alarm; 42 bu16 BFIN_MMR_16(pren); 43 }; 44 #define mmr_base() offsetof(struct bfin_rtc, stat) 45 #define mmr_offset(mmr) (offsetof(struct bfin_rtc, mmr) - mmr_base()) 46 47 static const char * const mmr_names[] = 48 { 49 "RTC_STAT", "RTC_ICTL", "RTC_ISTAT", "RTC_SWCNT", "RTC_ALARM", "RTC_PREN", 50 }; 51 #define mmr_name(off) mmr_names[(off) / 4] 52 53 static unsigned 54 bfin_rtc_io_write_buffer (struct hw *me, const void *source, 55 int space, address_word addr, unsigned nr_bytes) 56 { 57 struct bfin_rtc *rtc = hw_data (me); 58 bu32 mmr_off; 59 bu32 value; 60 bu16 *value16p; 61 bu32 *value32p; 62 void *valuep; 63 64 if (nr_bytes == 4) 65 value = dv_load_4 (source); 66 else 67 value = dv_load_2 (source); 68 69 mmr_off = addr - rtc->base; 70 valuep = (void *)((unsigned long)rtc + mmr_base() + mmr_off); 71 value16p = valuep; 72 value32p = valuep; 73 74 HW_TRACE_WRITE (); 75 76 /* XXX: These probably need more work. */ 77 switch (mmr_off) 78 { 79 case mmr_offset(stat): 80 /* XXX: Ignore these since we are wired to host. */ 81 break; 82 case mmr_offset(istat): 83 dv_w1c_2 (value16p, value, ~(1 << 14)); 84 break; 85 case mmr_offset(alarm): 86 break; 87 case mmr_offset(ictl): 88 /* XXX: This should schedule an event handler. */ 89 case mmr_offset(swcnt): 90 case mmr_offset(pren): 91 break; 92 } 93 94 return nr_bytes; 95 } 96 97 static unsigned 98 bfin_rtc_io_read_buffer (struct hw *me, void *dest, 99 int space, address_word addr, unsigned nr_bytes) 100 { 101 struct bfin_rtc *rtc = hw_data (me); 102 bu32 mmr_off; 103 bu16 *value16p; 104 bu32 *value32p; 105 void *valuep; 106 107 mmr_off = addr - rtc->base; 108 valuep = (void *)((unsigned long)rtc + mmr_base() + mmr_off); 109 value16p = valuep; 110 value32p = valuep; 111 112 HW_TRACE_READ (); 113 114 switch (mmr_off) 115 { 116 case mmr_offset(stat): 117 { 118 time_t t = time (NULL); 119 struct tm *tm = localtime (&t); 120 bu32 value = 121 (((tm->tm_year - 70) * 365 + tm->tm_yday) << 17) | 122 (tm->tm_hour << 12) | 123 (tm->tm_min << 6) | 124 (tm->tm_sec << 0); 125 dv_store_4 (dest, value); 126 break; 127 } 128 case mmr_offset(alarm): 129 dv_store_4 (dest, *value32p); 130 break; 131 case mmr_offset(istat): 132 case mmr_offset(ictl): 133 case mmr_offset(swcnt): 134 case mmr_offset(pren): 135 dv_store_2 (dest, *value16p); 136 break; 137 } 138 139 return nr_bytes; 140 } 141 142 static const struct hw_port_descriptor bfin_rtc_ports[] = 143 { 144 { "rtc", 0, 0, output_port, }, 145 { NULL, 0, 0, 0, }, 146 }; 147 148 static void 149 attach_bfin_rtc_regs (struct hw *me, struct bfin_rtc *rtc) 150 { 151 address_word attach_address; 152 int attach_space; 153 unsigned attach_size; 154 reg_property_spec reg; 155 156 if (hw_find_property (me, "reg") == NULL) 157 hw_abort (me, "Missing \"reg\" property"); 158 159 if (!hw_find_reg_array_property (me, "reg", 0, ®)) 160 hw_abort (me, "\"reg\" property must contain three addr/size entries"); 161 162 hw_unit_address_to_attach_address (hw_parent (me), 163 ®.address, 164 &attach_space, &attach_address, me); 165 hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me); 166 167 if (attach_size != BFIN_MMR_RTC_SIZE) 168 hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_RTC_SIZE); 169 170 hw_attach_address (hw_parent (me), 171 0, attach_space, attach_address, attach_size, me); 172 173 rtc->base = attach_address; 174 } 175 176 static void 177 bfin_rtc_finish (struct hw *me) 178 { 179 struct bfin_rtc *rtc; 180 181 rtc = HW_ZALLOC (me, struct bfin_rtc); 182 183 set_hw_data (me, rtc); 184 set_hw_io_read_buffer (me, bfin_rtc_io_read_buffer); 185 set_hw_io_write_buffer (me, bfin_rtc_io_write_buffer); 186 set_hw_ports (me, bfin_rtc_ports); 187 188 attach_bfin_rtc_regs (me, rtc); 189 190 /* Initialize the RTC. */ 191 } 192 193 const struct hw_descriptor dv_bfin_rtc_descriptor[] = 194 { 195 {"bfin_rtc", bfin_rtc_finish,}, 196 {NULL, NULL}, 197 }; 198