Furquan Shaikh | 94f8699 | 2016-12-01 07:12:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2016 Google Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (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 | |
| 17 | #include <spi-generic.h> |
| 18 | #include <string.h> |
| 19 | |
| 20 | int spi_claim_bus(const struct spi_slave *slave) |
| 21 | { |
| 22 | const struct spi_ctrlr *ctrlr = slave->ctrlr; |
| 23 | if (ctrlr && ctrlr->claim_bus) |
| 24 | return ctrlr->claim_bus(slave); |
| 25 | return 0; |
| 26 | } |
| 27 | |
| 28 | void spi_release_bus(const struct spi_slave *slave) |
| 29 | { |
| 30 | const struct spi_ctrlr *ctrlr = slave->ctrlr; |
| 31 | if (ctrlr && ctrlr->release_bus) |
| 32 | ctrlr->release_bus(slave); |
| 33 | } |
| 34 | |
| 35 | int spi_xfer(const struct spi_slave *slave, const void *dout, size_t bytesout, |
| 36 | void *din, size_t bytesin) |
| 37 | { |
| 38 | const struct spi_ctrlr *ctrlr = slave->ctrlr; |
| 39 | if (ctrlr && ctrlr->xfer) |
| 40 | return ctrlr->xfer(slave, dout, bytesout, din, bytesin); |
| 41 | |
| 42 | return -1; |
| 43 | } |
Furquan Shaikh | b5d41cb | 2016-12-01 07:25:31 -0800 | [diff] [blame^] | 44 | |
| 45 | void __attribute__((weak)) spi_init(void) |
| 46 | { |
| 47 | /* Default weak implementation - do nothing. */ |
| 48 | } |
| 49 | |
| 50 | const struct spi_ctrlr_buses spi_ctrlr_bus_map[0] __attribute__((weak)); |
| 51 | const size_t spi_ctrlr_bus_map_count __attribute__((weak)); |
| 52 | |
| 53 | int __attribute__((weak)) spi_setup_slave(unsigned int bus, unsigned int cs, |
| 54 | struct spi_slave *slave) |
| 55 | { |
| 56 | size_t i; |
| 57 | |
| 58 | memset(slave, 0, sizeof(*slave)); |
| 59 | |
| 60 | for (i = 0; i < spi_ctrlr_bus_map_count; i++) { |
| 61 | if ((spi_ctrlr_bus_map[i].bus_start <= bus) && |
| 62 | (spi_ctrlr_bus_map[i].bus_end >= bus)) { |
| 63 | slave->ctrlr = spi_ctrlr_bus_map[i].ctrlr; |
| 64 | break; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | if (slave->ctrlr == NULL) |
| 69 | return -1; |
| 70 | |
| 71 | slave->bus = bus; |
| 72 | slave->cs = cs; |
| 73 | |
| 74 | if (slave->ctrlr->setup) |
| 75 | return slave->ctrlr->setup(slave); |
| 76 | |
| 77 | return 0; |
| 78 | } |