diff options
Diffstat (limited to 'sim/bfin/dv-bfin_gptimer.c')
| -rw-r--r-- | sim/bfin/dv-bfin_gptimer.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/sim/bfin/dv-bfin_gptimer.c b/sim/bfin/dv-bfin_gptimer.c new file mode 100644 index 0000000..23c906f --- /dev/null +++ b/sim/bfin/dv-bfin_gptimer.c @@ -0,0 +1,183 @@ +/* Blackfin General Purpose Timers (GPtimer) model + + Copyright (C) 2010-2011 Free Software Foundation, Inc. + Contributed by Analog Devices, Inc. + + This file is part of simulators. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#include "config.h" + +#include "sim-main.h" +#include "devices.h" +#include "dv-bfin_gptimer.h" + +/* XXX: This is merely a stub. */ + +struct bfin_gptimer +{ + /* This top portion matches common dv_bfin struct. */ + bu32 base; + struct hw *dma_master; + bool acked; + + struct hw_event *handler; + char saved_byte; + int saved_count; + + /* Order after here is important -- matches hardware MMR layout. */ + bu16 BFIN_MMR_16(config); + bu32 counter, period, width; +}; +#define mmr_base() offsetof(struct bfin_gptimer, config) +#define mmr_offset(mmr) (offsetof(struct bfin_gptimer, mmr) - mmr_base()) + +static const char * const mmr_names[] = { + "TIMER_CONFIG", "TIMER_COUNTER", "TIMER_PERIOD", "TIMER_WIDTH", +}; +#define mmr_name(off) mmr_names[(off) / 4] + +static unsigned +bfin_gptimer_io_write_buffer (struct hw *me, const void *source, int space, + address_word addr, unsigned nr_bytes) +{ + struct bfin_gptimer *gptimer = hw_data (me); + bu32 mmr_off; + bu32 value; + bu16 *value16p; + bu32 *value32p; + void *valuep; + + if (nr_bytes == 4) + value = dv_load_4 (source); + else + value = dv_load_2 (source); + + mmr_off = addr - gptimer->base; + valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off); + value16p = valuep; + value32p = valuep; + + HW_TRACE_WRITE (); + + switch (mmr_off) + { + case mmr_offset(config): + dv_bfin_mmr_require_16 (me, addr, nr_bytes, true); + *value16p = value; + break; + case mmr_offset(counter): + case mmr_offset(period): + case mmr_offset(width): + dv_bfin_mmr_require_32 (me, addr, nr_bytes, true); + *value32p = value; + break; + default: + dv_bfin_mmr_invalid (me, addr, nr_bytes, true); + break; + } + + return nr_bytes; +} + +static unsigned +bfin_gptimer_io_read_buffer (struct hw *me, void *dest, int space, + address_word addr, unsigned nr_bytes) +{ + struct bfin_gptimer *gptimer = hw_data (me); + bu32 mmr_off; + bu16 *value16p; + bu32 *value32p; + void *valuep; + + mmr_off = addr - gptimer->base; + valuep = (void *)((unsigned long)gptimer + mmr_base() + mmr_off); + value16p = valuep; + value32p = valuep; + + HW_TRACE_READ (); + + switch (mmr_off) + { + case mmr_offset(config): + dv_bfin_mmr_require_16 (me, addr, nr_bytes, false); + dv_store_2 (dest, *value16p); + break; + case mmr_offset(counter): + case mmr_offset(period): + case mmr_offset(width): + dv_bfin_mmr_require_32 (me, addr, nr_bytes, false); + dv_store_4 (dest, *value32p); + break; + default: + dv_bfin_mmr_invalid (me, addr, nr_bytes, false); + break; + } + + return nr_bytes; +} + +static const struct hw_port_descriptor bfin_gptimer_ports[] = { + { "stat", 0, 0, output_port, }, + { NULL, 0, 0, 0, }, +}; + +static void +attach_bfin_gptimer_regs (struct hw *me, struct bfin_gptimer *gptimer) +{ + address_word attach_address; + int attach_space; + unsigned attach_size; + reg_property_spec reg; + + if (hw_find_property (me, "reg") == NULL) + hw_abort (me, "Missing \"reg\" property"); + + if (!hw_find_reg_array_property (me, "reg", 0, ®)) + hw_abort (me, "\"reg\" property must contain three addr/size entries"); + + hw_unit_address_to_attach_address (hw_parent (me), + ®.address, + &attach_space, &attach_address, me); + hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me); + + if (attach_size != BFIN_MMR_GPTIMER_SIZE) + hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPTIMER_SIZE); + + hw_attach_address (hw_parent (me), + 0, attach_space, attach_address, attach_size, me); + + gptimer->base = attach_address; +} + +static void +bfin_gptimer_finish (struct hw *me) +{ + struct bfin_gptimer *gptimer; + + gptimer = HW_ZALLOC (me, struct bfin_gptimer); + + set_hw_data (me, gptimer); + set_hw_io_read_buffer (me, bfin_gptimer_io_read_buffer); + set_hw_io_write_buffer (me, bfin_gptimer_io_write_buffer); + set_hw_ports (me, bfin_gptimer_ports); + + attach_bfin_gptimer_regs (me, gptimer); +} + +const struct hw_descriptor dv_bfin_gptimer_descriptor[] = { + {"bfin_gptimer", bfin_gptimer_finish,}, + {NULL, NULL}, +}; |