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, size: sizeof(struct octeon_spi));
28 if (!host)
29 return -ENOMEM;
30
31 p = spi_controller_get_devdata(ctlr: 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, bar: 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_enabled(dev, NULL);
53 if (IS_ERR(ptr: p->clk)) {
54 ret = PTR_ERR(ptr: p->clk);
55 goto error;
56 }
57
58 p->sys_freq = clk_get_rate(clk: p->clk);
59 if (!p->sys_freq)
60 p->sys_freq = SYS_FREQ_DEFAULT;
61 dev_info(dev, "Set system clock to %u\n", p->sys_freq);
62
63 host->flags = SPI_CONTROLLER_HALF_DUPLEX;
64 host->num_chipselect = 4;
65 host->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH |
66 SPI_LSB_FIRST | SPI_3WIRE;
67 host->transfer_one_message = octeon_spi_transfer_one_message;
68 host->bits_per_word_mask = SPI_BPW_MASK(8);
69 host->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;
70 host->dev.of_node = pdev->dev.of_node;
71
72 pci_set_drvdata(pdev, data: host);
73
74 ret = devm_spi_register_controller(dev, ctlr: host);
75 if (ret)
76 goto error;
77
78 return 0;
79
80error:
81 pci_release_regions(pdev);
82 spi_controller_put(ctlr: host);
83 return ret;
84}
85
86static void thunderx_spi_remove(struct pci_dev *pdev)
87{
88 struct spi_controller *host = pci_get_drvdata(pdev);
89 struct octeon_spi *p;
90
91 p = spi_controller_get_devdata(ctlr: host);
92 if (!p)
93 return;
94
95 pci_release_regions(pdev);
96 /* Put everything in a known state. */
97 writeq(val: 0, addr: p->register_base + OCTEON_SPI_CFG(p));
98}
99
100static const struct pci_device_id thunderx_spi_pci_id_table[] = {
101 { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa00b) },
102 { 0, }
103};
104
105MODULE_DEVICE_TABLE(pci, thunderx_spi_pci_id_table);
106
107static struct pci_driver thunderx_spi_driver = {
108 .name = DRV_NAME,
109 .id_table = thunderx_spi_pci_id_table,
110 .probe = thunderx_spi_probe,
111 .remove = thunderx_spi_remove,
112};
113
114module_pci_driver(thunderx_spi_driver);
115
116MODULE_DESCRIPTION("Cavium, Inc. ThunderX SPI bus driver");
117MODULE_AUTHOR("Jan Glauber");
118MODULE_LICENSE("GPL");
119

source code of linux/drivers/spi/spi-cavium-thunderx.c