1 /* 2 * Common SPI abstractions. 3 * 4 * Copyright (C) 2023 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA 20 */ 21 22 #pragma once 23 24 25 26 #ifdef __cplusplus 27 28 #include <l4/re/c/dma_space.h> 29 #include <stdint.h> 30 31 /* SPI channel abstractions. */ 32 33 class Spi_control_base 34 { 35 public: 36 virtual void acquire_control(bool asserted) = 0; 37 38 virtual void release_control() = 0; 39 }; 40 41 class Spi_channel_base 42 { 43 protected: 44 Spi_control_base *_control = NULL; 45 46 public: 47 void set_control(Spi_control_base *control) 48 { _control = control; } 49 50 virtual uint32_t send(uint32_t bytes, const uint8_t data[]) = 0; 51 52 virtual uint32_t send_dc(uint32_t bytes, const uint8_t data[], 53 const int dc[], uint8_t char_size, 54 bool big_endian) = 0; 55 56 virtual uint32_t send_units(uint32_t bytes, const uint8_t data[], 57 uint8_t unit_size, uint8_t char_size, 58 bool big_endian) = 0; 59 60 virtual uint32_t transfer(l4_addr_t vaddr, l4re_dma_space_dma_addr_t paddr, 61 uint32_t count, uint8_t unit_size, uint8_t char_size, 62 l4_addr_t desc_vaddr = 0, 63 l4re_dma_space_dma_addr_t desc_paddr = 0) = 0; 64 }; 65 66 #endif /* __cplusplus */