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63d49afe JG |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 2011, 2012 Cavium, Inc. | |
7 | */ | |
8 | ||
9 | #include <linux/platform_device.h> | |
10 | #include <linux/spi/spi.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/of.h> | |
14 | ||
15 | #include <asm/octeon/octeon.h> | |
16 | ||
17 | #include "spi-cavium.h" | |
18 | ||
19 | static int octeon_spi_probe(struct platform_device *pdev) | |
20 | { | |
21 | struct resource *res_mem; | |
22 | void __iomem *reg_base; | |
23 | struct spi_master *master; | |
24 | struct octeon_spi *p; | |
25 | int err = -ENOENT; | |
26 | ||
27 | master = spi_alloc_master(&pdev->dev, sizeof(struct octeon_spi)); | |
28 | if (!master) | |
29 | return -ENOMEM; | |
30 | p = spi_master_get_devdata(master); | |
31 | platform_set_drvdata(pdev, master); | |
32 | ||
33 | res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
34 | reg_base = devm_ioremap_resource(&pdev->dev, res_mem); | |
35 | if (IS_ERR(reg_base)) { | |
36 | err = PTR_ERR(reg_base); | |
37 | goto fail; | |
38 | } | |
39 | ||
40 | p->register_base = reg_base; | |
41 | p->sys_freq = octeon_get_io_clock_rate(); | |
42 | ||
43 | p->regs.config = 0; | |
44 | p->regs.status = 0x08; | |
45 | p->regs.tx = 0x10; | |
46 | p->regs.data = 0x80; | |
47 | ||
48 | master->num_chipselect = 4; | |
49 | master->mode_bits = SPI_CPHA | | |
50 | SPI_CPOL | | |
51 | SPI_CS_HIGH | | |
52 | SPI_LSB_FIRST | | |
53 | SPI_3WIRE; | |
54 | ||
55 | master->transfer_one_message = octeon_spi_transfer_one_message; | |
56 | master->bits_per_word_mask = SPI_BPW_MASK(8); | |
57 | master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; | |
58 | ||
59 | master->dev.of_node = pdev->dev.of_node; | |
60 | err = devm_spi_register_master(&pdev->dev, master); | |
61 | if (err) { | |
62 | dev_err(&pdev->dev, "register master failed: %d\n", err); | |
63 | goto fail; | |
64 | } | |
65 | ||
66 | dev_info(&pdev->dev, "OCTEON SPI bus driver\n"); | |
67 | ||
68 | return 0; | |
69 | fail: | |
70 | spi_master_put(master); | |
71 | return err; | |
72 | } | |
73 | ||
74 | static int octeon_spi_remove(struct platform_device *pdev) | |
75 | { | |
76 | struct spi_master *master = platform_get_drvdata(pdev); | |
77 | struct octeon_spi *p = spi_master_get_devdata(master); | |
78 | ||
79 | /* Clear the CSENA* and put everything in a known state. */ | |
80 | writeq(0, p->register_base + OCTEON_SPI_CFG(p)); | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static const struct of_device_id octeon_spi_match[] = { | |
86 | { .compatible = "cavium,octeon-3010-spi", }, | |
87 | {}, | |
88 | }; | |
89 | MODULE_DEVICE_TABLE(of, octeon_spi_match); | |
90 | ||
91 | static struct platform_driver octeon_spi_driver = { | |
92 | .driver = { | |
93 | .name = "spi-octeon", | |
94 | .of_match_table = octeon_spi_match, | |
95 | }, | |
96 | .probe = octeon_spi_probe, | |
97 | .remove = octeon_spi_remove, | |
98 | }; | |
99 | ||
100 | module_platform_driver(octeon_spi_driver); | |
101 | ||
102 | MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver"); | |
103 | MODULE_AUTHOR("David Daney"); | |
104 | MODULE_LICENSE("GPL"); |