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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
ff9c4c53 SR |
2 | /* |
3 | * Copyright (C) 2016 Stefan Roese <sr@denx.de> | |
ff9c4c53 SR |
4 | */ |
5 | ||
d678a59d | 6 | #include <common.h> |
ff9c4c53 | 7 | #include <altera.h> |
f7ae49fc | 8 | #include <log.h> |
ff9c4c53 SR |
9 | #include <spi.h> |
10 | #include <asm/io.h> | |
c05ed00a | 11 | #include <linux/delay.h> |
1221ce45 | 12 | #include <linux/errno.h> |
ff9c4c53 SR |
13 | |
14 | /* Write the RBF data to FPGA via SPI */ | |
15 | static int program_write(int spi_bus, int spi_dev, const void *rbf_data, | |
16 | unsigned long rbf_size) | |
17 | { | |
18 | struct spi_slave *slave; | |
19 | int ret; | |
20 | ||
21 | debug("%s (%d): data=%p size=%ld\n", | |
22 | __func__, __LINE__, rbf_data, rbf_size); | |
23 | ||
24 | /* FIXME: How to get the max. SPI clock and SPI mode? */ | |
25 | slave = spi_setup_slave(spi_bus, spi_dev, 27777777, SPI_MODE_3); | |
26 | if (!slave) | |
27 | return -1; | |
28 | ||
29 | if (spi_claim_bus(slave)) | |
30 | return -1; | |
31 | ||
32 | ret = spi_xfer(slave, rbf_size * 8, rbf_data, (void *)rbf_data, | |
33 | SPI_XFER_BEGIN | SPI_XFER_END); | |
34 | ||
35 | spi_release_bus(slave); | |
36 | ||
37 | return ret; | |
38 | } | |
39 | ||
40 | /* | |
41 | * This is the interface used by FPGA driver. | |
42 | * Return 0 for sucess, non-zero for error. | |
43 | */ | |
44 | int stratixv_load(Altera_desc *desc, const void *rbf_data, size_t rbf_size) | |
45 | { | |
46 | altera_board_specific_func *pfns = desc->iface_fns; | |
47 | int cookie = desc->cookie; | |
48 | int spi_bus; | |
49 | int spi_dev; | |
50 | int ret = 0; | |
51 | ||
52 | if ((u32)rbf_data & 0x3) { | |
53 | puts("FPGA: Unaligned data, realign to 32bit boundary.\n"); | |
54 | return -EINVAL; | |
55 | } | |
56 | ||
57 | /* Run the pre configuration function if there is one */ | |
58 | if (pfns->pre) | |
59 | (pfns->pre)(cookie); | |
60 | ||
61 | /* Establish the initial state */ | |
62 | if (pfns->config) { | |
63 | /* De-assert nCONFIG */ | |
64 | (pfns->config)(false, true, cookie); | |
65 | ||
66 | /* nConfig minimum low pulse width is 2us */ | |
67 | udelay(200); | |
68 | ||
69 | /* Assert nCONFIG */ | |
70 | (pfns->config)(true, true, cookie); | |
71 | ||
72 | /* nCONFIG high to first rising clock on DCLK min 1506 us */ | |
73 | udelay(1600); | |
74 | } | |
75 | ||
76 | /* Write the RBF data to FPGA */ | |
77 | if (pfns->write) { | |
78 | /* | |
79 | * Use board specific data function to write bitstream | |
80 | * into the FPGA | |
81 | */ | |
82 | ret = (pfns->write)(rbf_data, rbf_size, true, cookie); | |
83 | } else { | |
84 | /* | |
85 | * Use common SPI functions to write bitstream into the | |
86 | * FPGA | |
87 | */ | |
88 | spi_bus = COOKIE2SPI_BUS(cookie); | |
89 | spi_dev = COOKIE2SPI_DEV(cookie); | |
90 | ret = program_write(spi_bus, spi_dev, rbf_data, rbf_size); | |
91 | } | |
92 | if (ret) | |
93 | return ret; | |
94 | ||
95 | /* Check done pin */ | |
96 | if (pfns->done) { | |
97 | ret = (pfns->done)(cookie); | |
98 | ||
99 | if (ret) | |
100 | printf("Error: DONE not set (ret=%d)!\n", ret); | |
101 | } | |
102 | ||
103 | return ret; | |
104 | } |