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
19static int octeon_spi_probe(struct platform_device *pdev)
20{
21	void __iomem *reg_base;
22	struct spi_controller *host;
23	struct octeon_spi *p;
24	int err = -ENOENT;
25
26	host = spi_alloc_host(&pdev->dev, sizeof(struct octeon_spi));
27	if (!host)
28		return -ENOMEM;
29	p = spi_controller_get_devdata(host);
30	platform_set_drvdata(pdev, host);
31
32	reg_base = devm_platform_ioremap_resource(pdev, 0);
33	if (IS_ERR(reg_base)) {
34		err = PTR_ERR(reg_base);
35		goto fail;
36	}
37
38	p->register_base = reg_base;
39	p->sys_freq = octeon_get_io_clock_rate();
40
41	p->regs.config = 0;
42	p->regs.status = 0x08;
43	p->regs.tx = 0x10;
44	p->regs.data = 0x80;
45
46	host->num_chipselect = 4;
47	host->mode_bits = SPI_CPHA |
48			    SPI_CPOL |
49			    SPI_CS_HIGH |
50			    SPI_LSB_FIRST |
51			    SPI_3WIRE;
52
53	host->transfer_one_message = octeon_spi_transfer_one_message;
54	host->bits_per_word_mask = SPI_BPW_MASK(8);
55	host->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;
56
57	host->dev.of_node = pdev->dev.of_node;
58	err = devm_spi_register_controller(&pdev->dev, host);
59	if (err) {
60		dev_err(&pdev->dev, "register host failed: %d\n", err);
61		goto fail;
62	}
63
64	dev_info(&pdev->dev, "OCTEON SPI bus driver\n");
65
66	return 0;
67fail:
68	spi_controller_put(host);
69	return err;
70}
71
72static void octeon_spi_remove(struct platform_device *pdev)
73{
74	struct spi_controller *host = platform_get_drvdata(pdev);
75	struct octeon_spi *p = spi_controller_get_devdata(host);
76
77	/* Clear the CSENA* and put everything in a known state. */
78	writeq(0, p->register_base + OCTEON_SPI_CFG(p));
79}
80
81static const struct of_device_id octeon_spi_match[] = {
82	{ .compatible = "cavium,octeon-3010-spi", },
83	{},
84};
85MODULE_DEVICE_TABLE(of, octeon_spi_match);
86
87static struct platform_driver octeon_spi_driver = {
88	.driver = {
89		.name		= "spi-octeon",
90		.of_match_table = octeon_spi_match,
91	},
92	.probe		= octeon_spi_probe,
93	.remove_new	= octeon_spi_remove,
94};
95
96module_platform_driver(octeon_spi_driver);
97
98MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver");
99MODULE_AUTHOR("David Daney");
100MODULE_LICENSE("GPL");
101