1 /* 2 * Copyright (C) 2016 Stefan Roese <sr@denx.de> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <altera.h> 9 #include <spi.h> 10 #include <asm/io.h> 11 #include <linux/errno.h> 12 13 /* Write the RBF data to FPGA via SPI */ 14 static int program_write(int spi_bus, int spi_dev, const void *rbf_data, 15 unsigned long rbf_size) 16 { 17 struct spi_slave *slave; 18 int ret; 19 20 debug("%s (%d): data=%p size=%ld\n", 21 __func__, __LINE__, rbf_data, rbf_size); 22 23 /* FIXME: How to get the max. SPI clock and SPI mode? */ 24 slave = spi_setup_slave(spi_bus, spi_dev, 27777777, SPI_MODE_3); 25 if (!slave) 26 return -1; 27 28 if (spi_claim_bus(slave)) 29 return -1; 30 31 ret = spi_xfer(slave, rbf_size * 8, rbf_data, (void *)rbf_data, 32 SPI_XFER_BEGIN | SPI_XFER_END); 33 34 spi_release_bus(slave); 35 36 return ret; 37 } 38 39 /* 40 * This is the interface used by FPGA driver. 41 * Return 0 for sucess, non-zero for error. 42 */ 43 int stratixv_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size) 44 { 45 altera_board_specific_func *pfns = desc->iface_fns; 46 int cookie = desc->cookie; 47 int spi_bus; 48 int spi_dev; 49 int ret = 0; 50 51 if ((u32)rbf_data & 0x3) { 52 puts("FPGA: Unaligned data, realign to 32bit boundary.\n"); 53 return -EINVAL; 54 } 55 56 /* Run the pre configuration function if there is one */ 57 if (pfns->pre) 58 (pfns->pre)(cookie); 59 60 /* Establish the initial state */ 61 if (pfns->config) { 62 /* De-assert nCONFIG */ 63 (pfns->config)(false, true, cookie); 64 65 /* nConfig minimum low pulse width is 2us */ 66 udelay(200); 67 68 /* Assert nCONFIG */ 69 (pfns->config)(true, true, cookie); 70 71 /* nCONFIG high to first rising clock on DCLK min 1506 us */ 72 udelay(1600); 73 } 74 75 /* Write the RBF data to FPGA */ 76 if (pfns->write) { 77 /* 78 * Use board specific data function to write bitstream 79 * into the FPGA 80 */ 81 ret = (pfns->write)(rbf_data, rbf_size, true, cookie); 82 } else { 83 /* 84 * Use common SPI functions to write bitstream into the 85 * FPGA 86 */ 87 spi_bus = COOKIE2SPI_BUS(cookie); 88 spi_dev = COOKIE2SPI_DEV(cookie); 89 ret = program_write(spi_bus, spi_dev, rbf_data, rbf_size); 90 } 91 if (ret) 92 return ret; 93 94 /* Check done pin */ 95 if (pfns->done) { 96 ret = (pfns->done)(cookie); 97 98 if (ret) 99 printf("Error: DONE not set (ret=%d)!\n", ret); 100 } 101 102 return ret; 103 } 104