]> git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/fpga/stratixv.c
fpga: altera: Add StratixV support
[people/ms/u-boot.git] / drivers / fpga / stratixv.c
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 <asm/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 }