16122813fSMike Frysinger /* 26122813fSMike Frysinger * Simulate a SPI port 36122813fSMike Frysinger * 46122813fSMike Frysinger * Copyright (c) 2011-2013 The Chromium OS Authors. 56122813fSMike Frysinger * See file CREDITS for list of people who contributed to this 66122813fSMike Frysinger * project. 76122813fSMike Frysinger * 86122813fSMike Frysinger * Licensed under the GPL-2 or later. 96122813fSMike Frysinger */ 106122813fSMike Frysinger 116122813fSMike Frysinger #include <common.h> 1249b5d6e6SSimon Glass #include <dm.h> 136122813fSMike Frysinger #include <malloc.h> 146122813fSMike Frysinger #include <spi.h> 1549b5d6e6SSimon Glass #include <spi_flash.h> 166122813fSMike Frysinger #include <os.h> 176122813fSMike Frysinger 18*1221ce45SMasahiro Yamada #include <linux/errno.h> 196122813fSMike Frysinger #include <asm/spi.h> 206122813fSMike Frysinger #include <asm/state.h> 2149b5d6e6SSimon Glass #include <dm/device-internal.h> 2249b5d6e6SSimon Glass 2349b5d6e6SSimon Glass DECLARE_GLOBAL_DATA_PTR; 246122813fSMike Frysinger 256122813fSMike Frysinger #ifndef CONFIG_SPI_IDLE_VAL 266122813fSMike Frysinger # define CONFIG_SPI_IDLE_VAL 0xFF 276122813fSMike Frysinger #endif 286122813fSMike Frysinger 296122813fSMike Frysinger const char *sandbox_spi_parse_spec(const char *arg, unsigned long *bus, 306122813fSMike Frysinger unsigned long *cs) 316122813fSMike Frysinger { 326122813fSMike Frysinger char *endp; 336122813fSMike Frysinger 346122813fSMike Frysinger *bus = simple_strtoul(arg, &endp, 0); 356122813fSMike Frysinger if (*endp != ':' || *bus >= CONFIG_SANDBOX_SPI_MAX_BUS) 366122813fSMike Frysinger return NULL; 376122813fSMike Frysinger 386122813fSMike Frysinger *cs = simple_strtoul(endp + 1, &endp, 0); 396122813fSMike Frysinger if (*endp != ':' || *cs >= CONFIG_SANDBOX_SPI_MAX_CS) 406122813fSMike Frysinger return NULL; 416122813fSMike Frysinger 426122813fSMike Frysinger return endp + 1; 436122813fSMike Frysinger } 446122813fSMike Frysinger 4549b5d6e6SSimon Glass __weak int sandbox_spi_get_emul(struct sandbox_state *state, 4649b5d6e6SSimon Glass struct udevice *bus, struct udevice *slave, 4749b5d6e6SSimon Glass struct udevice **emulp) 486122813fSMike Frysinger { 4949b5d6e6SSimon Glass return -ENOENT; 506122813fSMike Frysinger } 516122813fSMike Frysinger 5249b5d6e6SSimon Glass static int sandbox_spi_xfer(struct udevice *slave, unsigned int bitlen, 5349b5d6e6SSimon Glass const void *dout, void *din, unsigned long flags) 546122813fSMike Frysinger { 5549b5d6e6SSimon Glass struct udevice *bus = slave->parent; 566122813fSMike Frysinger struct sandbox_state *state = state_get_current(); 5749b5d6e6SSimon Glass struct dm_spi_emul_ops *ops; 5849b5d6e6SSimon Glass struct udevice *emul; 596122813fSMike Frysinger uint bytes = bitlen / 8, i; 6049b5d6e6SSimon Glass int ret; 616122813fSMike Frysinger u8 *tx = (void *)dout, *rx = din; 6249b5d6e6SSimon Glass uint busnum, cs; 636122813fSMike Frysinger 646122813fSMike Frysinger if (bitlen == 0) 6549b5d6e6SSimon Glass return 0; 666122813fSMike Frysinger 676122813fSMike Frysinger /* we can only do 8 bit transfers */ 686122813fSMike Frysinger if (bitlen % 8) { 696122813fSMike Frysinger printf("sandbox_spi: xfer: invalid bitlen size %u; needs to be 8bit\n", 706122813fSMike Frysinger bitlen); 7149b5d6e6SSimon Glass return -EINVAL; 726122813fSMike Frysinger } 736122813fSMike Frysinger 7449b5d6e6SSimon Glass busnum = bus->seq; 7549b5d6e6SSimon Glass cs = spi_chip_select(slave); 7649b5d6e6SSimon Glass if (busnum >= CONFIG_SANDBOX_SPI_MAX_BUS || 7749b5d6e6SSimon Glass cs >= CONFIG_SANDBOX_SPI_MAX_CS) { 7849b5d6e6SSimon Glass printf("%s: busnum=%u, cs=%u: out of range\n", __func__, 7949b5d6e6SSimon Glass busnum, cs); 8049b5d6e6SSimon Glass return -ENOENT; 8149b5d6e6SSimon Glass } 8249b5d6e6SSimon Glass ret = sandbox_spi_get_emul(state, bus, slave, &emul); 8349b5d6e6SSimon Glass if (ret) { 8449b5d6e6SSimon Glass printf("%s: busnum=%u, cs=%u: no emulation available (err=%d)\n", 8549b5d6e6SSimon Glass __func__, busnum, cs, ret); 8649b5d6e6SSimon Glass return -ENOENT; 8749b5d6e6SSimon Glass } 8849b5d6e6SSimon Glass ret = device_probe(emul); 8949b5d6e6SSimon Glass if (ret) 9049b5d6e6SSimon Glass return ret; 916122813fSMike Frysinger 926122813fSMike Frysinger /* make sure rx/tx buffers are full so clients can assume */ 936122813fSMike Frysinger if (!tx) { 946122813fSMike Frysinger debug("sandbox_spi: xfer: auto-allocating tx scratch buffer\n"); 956122813fSMike Frysinger tx = malloc(bytes); 966122813fSMike Frysinger if (!tx) { 976122813fSMike Frysinger debug("sandbox_spi: Out of memory\n"); 986122813fSMike Frysinger return -ENOMEM; 996122813fSMike Frysinger } 1006122813fSMike Frysinger } 1016122813fSMike Frysinger if (!rx) { 1026122813fSMike Frysinger debug("sandbox_spi: xfer: auto-allocating rx scratch buffer\n"); 1036122813fSMike Frysinger rx = malloc(bytes); 1046122813fSMike Frysinger if (!rx) { 1056122813fSMike Frysinger debug("sandbox_spi: Out of memory\n"); 1066122813fSMike Frysinger return -ENOMEM; 1076122813fSMike Frysinger } 1086122813fSMike Frysinger } 1096122813fSMike Frysinger 11049b5d6e6SSimon Glass ops = spi_emul_get_ops(emul); 11149b5d6e6SSimon Glass ret = ops->xfer(emul, bitlen, dout, din, flags); 1126122813fSMike Frysinger 1136122813fSMike Frysinger debug("sandbox_spi: xfer: got back %i (that's %s)\n rx:", 1146122813fSMike Frysinger ret, ret ? "bad" : "good"); 1156122813fSMike Frysinger for (i = 0; i < bytes; ++i) 1166122813fSMike Frysinger debug(" %u:%02x", i, rx[i]); 1176122813fSMike Frysinger debug("\n"); 1186122813fSMike Frysinger 1196122813fSMike Frysinger if (tx != dout) 1206122813fSMike Frysinger free(tx); 1216122813fSMike Frysinger if (rx != din) 1226122813fSMike Frysinger free(rx); 1236122813fSMike Frysinger 1246122813fSMike Frysinger return ret; 1256122813fSMike Frysinger } 1266e16d90aSSimon Glass 12749b5d6e6SSimon Glass static int sandbox_spi_set_speed(struct udevice *bus, uint speed) 1286e16d90aSSimon Glass { 12949b5d6e6SSimon Glass return 0; 1306e16d90aSSimon Glass } 13149b5d6e6SSimon Glass 13249b5d6e6SSimon Glass static int sandbox_spi_set_mode(struct udevice *bus, uint mode) 13349b5d6e6SSimon Glass { 13449b5d6e6SSimon Glass return 0; 13549b5d6e6SSimon Glass } 13649b5d6e6SSimon Glass 13749b5d6e6SSimon Glass static int sandbox_cs_info(struct udevice *bus, uint cs, 13849b5d6e6SSimon Glass struct spi_cs_info *info) 13949b5d6e6SSimon Glass { 14049b5d6e6SSimon Glass /* Always allow activity on CS 0 */ 14149b5d6e6SSimon Glass if (cs >= 1) 14249b5d6e6SSimon Glass return -ENODEV; 14349b5d6e6SSimon Glass 14449b5d6e6SSimon Glass return 0; 14549b5d6e6SSimon Glass } 14649b5d6e6SSimon Glass 14749b5d6e6SSimon Glass static const struct dm_spi_ops sandbox_spi_ops = { 14849b5d6e6SSimon Glass .xfer = sandbox_spi_xfer, 14949b5d6e6SSimon Glass .set_speed = sandbox_spi_set_speed, 15049b5d6e6SSimon Glass .set_mode = sandbox_spi_set_mode, 15149b5d6e6SSimon Glass .cs_info = sandbox_cs_info, 15249b5d6e6SSimon Glass }; 15349b5d6e6SSimon Glass 15449b5d6e6SSimon Glass static const struct udevice_id sandbox_spi_ids[] = { 15549b5d6e6SSimon Glass { .compatible = "sandbox,spi" }, 15649b5d6e6SSimon Glass { } 15749b5d6e6SSimon Glass }; 15849b5d6e6SSimon Glass 15949b5d6e6SSimon Glass U_BOOT_DRIVER(spi_sandbox) = { 16049b5d6e6SSimon Glass .name = "spi_sandbox", 16149b5d6e6SSimon Glass .id = UCLASS_SPI, 16249b5d6e6SSimon Glass .of_match = sandbox_spi_ids, 16349b5d6e6SSimon Glass .ops = &sandbox_spi_ops, 16449b5d6e6SSimon Glass }; 165