Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 9651679ee7f7330a7f68ca469fb7d43226dfb515 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
// SPDX-License-Identifier: GPL-2.0-only
/*
 * PCI interface driver for DW SPI Core
 *
 * Copyright (c) 2009, 2014 Intel Corporation.
 */

#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/module.h>

#include "spi-dw.h"

#define DRIVER_NAME "dw_spi_pci"

struct spi_pci_desc {
	int	(*setup)(struct dw_spi *);
	u16	num_cs;
	u16	bus_num;
};

static struct spi_pci_desc spi_pci_mid_desc_1 = {
	.setup = dw_spi_mid_init,
	.num_cs = 5,
	.bus_num = 0,
};

static struct spi_pci_desc spi_pci_mid_desc_2 = {
	.setup = dw_spi_mid_init,
	.num_cs = 2,
	.bus_num = 1,
};

static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct dw_spi *dws;
	struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data;
	int pci_bar = 0;
	int ret;

	ret = pcim_enable_device(pdev);
	if (ret)
		return ret;

	dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL);
	if (!dws)
		return -ENOMEM;

	/* Get basic io resource and map it */
	dws->paddr = pci_resource_start(pdev, pci_bar);

	ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev));
	if (ret)
		return ret;

	dws->regs = pcim_iomap_table(pdev)[pci_bar];
	dws->irq = pdev->irq;

	/*
	 * Specific handling for platforms, like dma setup,
	 * clock rate, FIFO depth.
	 */
	if (desc) {
		dws->num_cs = desc->num_cs;
		dws->bus_num = desc->bus_num;

		if (desc->setup) {
			ret = desc->setup(dws);
			if (ret)
				return ret;
		}
	} else {
		return -ENODEV;
	}

	ret = dw_spi_add_host(&pdev->dev, dws);
	if (ret)
		return ret;

	/* PCI hook and SPI hook use the same drv data */
	pci_set_drvdata(pdev, dws);

	dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
		pdev->vendor, pdev->device);

	return 0;
}

static void spi_pci_remove(struct pci_dev *pdev)
{
	struct dw_spi *dws = pci_get_drvdata(pdev);

	dw_spi_remove_host(dws);
}

#ifdef CONFIG_PM_SLEEP
static int spi_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct dw_spi *dws = pci_get_drvdata(pdev);

	return dw_spi_suspend_host(dws);
}

static int spi_resume(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct dw_spi *dws = pci_get_drvdata(pdev);

	return dw_spi_resume_host(dws);
}
#endif

static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);

static const struct pci_device_id pci_ids[] = {
	/* Intel MID platform SPI controller 0 */
	/*
	 * The access to the device 8086:0801 is disabled by HW, since it's
	 * exclusively used by SCU to communicate with MSIC.
	 */
	/* Intel MID platform SPI controller 1 */
	{ PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1},
	/* Intel MID platform SPI controller 2 */
	{ PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2},
	{},
};

static struct pci_driver dw_spi_driver = {
	.name =		DRIVER_NAME,
	.id_table =	pci_ids,
	.probe =	spi_pci_probe,
	.remove =	spi_pci_remove,
	.driver         = {
		.pm     = &dw_spi_pm_ops,
	},
};

module_pci_driver(dw_spi_driver);

MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
MODULE_LICENSE("GPL v2");