1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Cavium ThunderX SPI driver.
4 *
5 * Copyright (C) 2016 Cavium Inc.
6 * Authors: Jan Glauber <jglauber@cavium.com>
7 */
8
9#include <linux/module.h>
10#include <linux/pci.h>
11#include <linux/spi/spi.h>
12
13#include "spi-cavium.h"
14
15#define DRV_NAME "spi-thunderx"
16
17#define SYS_FREQ_DEFAULT 700000000 /* 700 Mhz */
18
19static int thunderx_spi_probe(struct pci_dev *pdev,
20			      const struct pci_device_id *ent)
21{
22	struct device *dev = &pdev->dev;
23	struct spi_controller *host;
24	struct octeon_spi *p;
25	int ret;
26
27	host = spi_alloc_host(dev, sizeof(struct octeon_spi));
28	if (!host)
29		return -ENOMEM;
30
31	p = spi_controller_get_devdata(host);
32
33	ret = pcim_enable_device(pdev);
34	if (ret)
35		goto error;
36
37	ret = pci_request_regions(pdev, DRV_NAME);
38	if (ret)
39		goto error;
40
41	p->register_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
42	if (!p->register_base) {
43		ret = -EINVAL;
44		goto error;
45	}
46
47	p->regs.config = 0x1000;
48	p->regs.status = 0x1008;
49	p->regs.tx = 0x1010;
50	p->regs.data = 0x1080;
51
52	p->clk = devm_clk_get(dev, NULL);
53	if (IS_ERR(p->clk)) {
54		ret = PTR_ERR(p->clk);
55		goto error;
56	}
57
58	ret = clk_prepare_enable(p->clk);
59	if (ret)
60		goto error;
61
62	p->sys_freq = clk_get_rate(p->clk);
63	if (!p->sys_freq)
64		p->sys_freq = SYS_FREQ_DEFAULT;
65	dev_info(dev, "Set system clock to %u\n", p->sys_freq);
66
67	host->flags = SPI_CONTROLLER_HALF_DUPLEX;
68	host->num_chipselect = 4;
69	host->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH |
70			    SPI_LSB_FIRST | SPI_3WIRE;
71	host->transfer_one_message = octeon_spi_transfer_one_message;
72	host->bits_per_word_mask = SPI_BPW_MASK(8);
73	host->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;
74	host->dev.of_node = pdev->dev.of_node;
75
76	pci_set_drvdata(pdev, host);
77
78	ret = devm_spi_register_controller(dev, host);
79	if (ret)
80		goto error;
81
82	return 0;
83
84error:
85	clk_disable_unprepare(p->clk);
86	pci_release_regions(pdev);
87	spi_controller_put(host);
88	return ret;
89}
90
91static void thunderx_spi_remove(struct pci_dev *pdev)
92{
93	struct spi_controller *host = pci_get_drvdata(pdev);
94	struct octeon_spi *p;
95
96	p = spi_controller_get_devdata(host);
97	if (!p)
98		return;
99
100	clk_disable_unprepare(p->clk);
101	pci_release_regions(pdev);
102	/* Put everything in a known state. */
103	writeq(0, p->register_base + OCTEON_SPI_CFG(p));
104}
105
106static const struct pci_device_id thunderx_spi_pci_id_table[] = {
107	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa00b) },
108	{ 0, }
109};
110
111MODULE_DEVICE_TABLE(pci, thunderx_spi_pci_id_table);
112
113static struct pci_driver thunderx_spi_driver = {
114	.name		= DRV_NAME,
115	.id_table	= thunderx_spi_pci_id_table,
116	.probe		= thunderx_spi_probe,
117	.remove		= thunderx_spi_remove,
118};
119
120module_pci_driver(thunderx_spi_driver);
121
122MODULE_DESCRIPTION("Cavium, Inc. ThunderX SPI bus driver");
123MODULE_AUTHOR("Jan Glauber");
124MODULE_LICENSE("GPL");
125