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- /* Blackfin Two Wire Interface (TWI) model
- Copyright (C) 2010-2022 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/>. */
- /* This must come before any other includes. */
- #include "defs.h"
- #include "sim-main.h"
- #include "devices.h"
- #include "dv-bfin_twi.h"
- /* XXX: This is merely a stub. */
- struct bfin_twi
- {
- /* 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;
- bu16 xmt_fifo, rcv_fifo;
- /* Order after here is important -- matches hardware MMR layout. */
- bu16 BFIN_MMR_16(clkdiv);
- bu16 BFIN_MMR_16(control);
- bu16 BFIN_MMR_16(slave_ctl);
- bu16 BFIN_MMR_16(slave_stat);
- bu16 BFIN_MMR_16(slave_addr);
- bu16 BFIN_MMR_16(master_ctl);
- bu16 BFIN_MMR_16(master_stat);
- bu16 BFIN_MMR_16(master_addr);
- bu16 BFIN_MMR_16(int_stat);
- bu16 BFIN_MMR_16(int_mask);
- bu16 BFIN_MMR_16(fifo_ctl);
- bu16 BFIN_MMR_16(fifo_stat);
- bu32 _pad0[20];
- bu16 BFIN_MMR_16(xmt_data8);
- bu16 BFIN_MMR_16(xmt_data16);
- bu16 BFIN_MMR_16(rcv_data8);
- bu16 BFIN_MMR_16(rcv_data16);
- };
- #define mmr_base() offsetof(struct bfin_twi, clkdiv)
- #define mmr_offset(mmr) (offsetof(struct bfin_twi, mmr) - mmr_base())
- #define mmr_idx(mmr) (mmr_offset (mmr) / 4)
- static const char * const mmr_names[] =
- {
- "TWI_CLKDIV", "TWI_CONTROL", "TWI_SLAVE_CTL", "TWI_SLAVE_STAT",
- "TWI_SLAVE_ADDR", "TWI_MASTER_CTL", "TWI_MASTER_STAT", "TWI_MASTER_ADDR",
- "TWI_INT_STAT", "TWI_INT_MASK", "TWI_FIFO_CTL", "TWI_FIFO_STAT",
- [mmr_idx (xmt_data8)] = "TWI_XMT_DATA8", "TWI_XMT_DATA16", "TWI_RCV_DATA8",
- "TWI_RCV_DATA16",
- };
- #define mmr_name(off) (mmr_names[(off) / 4] ? : "<INV>")
- static unsigned
- bfin_twi_io_write_buffer (struct hw *me, const void *source, int space,
- address_word addr, unsigned nr_bytes)
- {
- struct bfin_twi *twi = hw_data (me);
- bu32 mmr_off;
- bu32 value;
- bu16 *valuep;
- /* Invalid access mode is higher priority than missing register. */
- if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
- return 0;
- value = dv_load_2 (source);
- mmr_off = addr - twi->base;
- valuep = (void *)((uintptr_t)twi + mmr_base() + mmr_off);
- HW_TRACE_WRITE ();
- switch (mmr_off)
- {
- case mmr_offset(clkdiv):
- case mmr_offset(control):
- case mmr_offset(slave_ctl):
- case mmr_offset(slave_addr):
- case mmr_offset(master_ctl):
- case mmr_offset(master_addr):
- case mmr_offset(int_mask):
- case mmr_offset(fifo_ctl):
- *valuep = value;
- break;
- case mmr_offset(int_stat):
- dv_w1c_2 (valuep, value, -1);
- break;
- case mmr_offset(master_stat):
- dv_w1c_2 (valuep, value, BUFWRERR | BUFRDERR | DNAK | ANAK | LOSTARB);
- break;
- case mmr_offset(slave_stat):
- case mmr_offset(fifo_stat):
- case mmr_offset(rcv_data8):
- case mmr_offset(rcv_data16):
- /* These are all RO. XXX: Does these throw error ? */
- break;
- case mmr_offset(xmt_data8):
- value &= 0xff;
- case mmr_offset(xmt_data16):
- twi->xmt_fifo = value;
- break;
- default:
- dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
- return 0;
- }
- return nr_bytes;
- }
- static unsigned
- bfin_twi_io_read_buffer (struct hw *me, void *dest, int space,
- address_word addr, unsigned nr_bytes)
- {
- struct bfin_twi *twi = hw_data (me);
- bu32 mmr_off;
- bu16 *valuep;
- /* Invalid access mode is higher priority than missing register. */
- if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false))
- return 0;
- mmr_off = addr - twi->base;
- valuep = (void *)((uintptr_t)twi + mmr_base() + mmr_off);
- HW_TRACE_READ ();
- switch (mmr_off)
- {
- case mmr_offset(clkdiv):
- case mmr_offset(control):
- case mmr_offset(slave_ctl):
- case mmr_offset(slave_stat):
- case mmr_offset(slave_addr):
- case mmr_offset(master_ctl):
- case mmr_offset(master_stat):
- case mmr_offset(master_addr):
- case mmr_offset(int_stat):
- case mmr_offset(int_mask):
- case mmr_offset(fifo_ctl):
- case mmr_offset(fifo_stat):
- dv_store_2 (dest, *valuep);
- break;
- case mmr_offset(rcv_data8):
- case mmr_offset(rcv_data16):
- dv_store_2 (dest, twi->rcv_fifo);
- break;
- case mmr_offset(xmt_data8):
- case mmr_offset(xmt_data16):
- /* These always read as 0. */
- dv_store_2 (dest, 0);
- break;
- default:
- dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
- return 0;
- }
- return nr_bytes;
- }
- static const struct hw_port_descriptor bfin_twi_ports[] =
- {
- { "stat", 0, 0, output_port, },
- { NULL, 0, 0, 0, },
- };
- static void
- attach_bfin_twi_regs (struct hw *me, struct bfin_twi *twi)
- {
- 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_TWI_SIZE)
- hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_TWI_SIZE);
- hw_attach_address (hw_parent (me),
- 0, attach_space, attach_address, attach_size, me);
- twi->base = attach_address;
- }
- static void
- bfin_twi_finish (struct hw *me)
- {
- struct bfin_twi *twi;
- twi = HW_ZALLOC (me, struct bfin_twi);
- set_hw_data (me, twi);
- set_hw_io_read_buffer (me, bfin_twi_io_read_buffer);
- set_hw_io_write_buffer (me, bfin_twi_io_write_buffer);
- set_hw_ports (me, bfin_twi_ports);
- attach_bfin_twi_regs (me, twi);
- }
- const struct hw_descriptor dv_bfin_twi_descriptor[] =
- {
- {"bfin_twi", bfin_twi_finish,},
- {NULL, NULL},
- };
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