aboutsummaryrefslogtreecommitdiff
path: root/drivers/spi/pxa2xx_spi_pci.c
blob: 351d8a375b57c33ee36021f1050ae103567c3bb6 (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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/*
 * CE4100's SPI device is more or less the same one as found on PXA
 *
 */
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/spi/pxa2xx_spi.h>

struct awesome_struct {
	struct ssp_device ssp;
	struct platform_device spi_pdev;
	struct pxa2xx_spi_master spi_pdata;
};

static DEFINE_MUTEX(ssp_lock);
static LIST_HEAD(ssp_list);

struct ssp_device *pxa_ssp_request(int port, const char *label)
{
	struct ssp_device *ssp = NULL;

	mutex_lock(&ssp_lock);

	list_for_each_entry(ssp, &ssp_list, node) {
		if (ssp->port_id == port && ssp->use_count == 0) {
			ssp->use_count++;
			ssp->label = label;
			break;
		}
	}

	mutex_unlock(&ssp_lock);

	if (&ssp->node == &ssp_list)
		return NULL;

	return ssp;
}
EXPORT_SYMBOL_GPL(pxa_ssp_request);

void pxa_ssp_free(struct ssp_device *ssp)
{
	mutex_lock(&ssp_lock);
	if (ssp->use_count) {
		ssp->use_count--;
		ssp->label = NULL;
	} else
		dev_err(&ssp->pdev->dev, "device already free\n");
	mutex_unlock(&ssp_lock);
}
EXPORT_SYMBOL_GPL(pxa_ssp_free);

static void plat_dev_release(struct device *dev)
{
	struct awesome_struct *as = container_of(dev,
			struct awesome_struct, spi_pdev.dev);

	of_device_node_put(&as->spi_pdev.dev);
}

static int __devinit ce4100_spi_probe(struct pci_dev *dev,
		const struct pci_device_id *ent)
{
	int ret;
	resource_size_t phys_beg;
	resource_size_t phys_len;
	struct awesome_struct *spi_info;
	struct platform_device *pdev;
	struct pxa2xx_spi_master *spi_pdata;
	struct ssp_device *ssp;

	ret = pci_enable_device(dev);
	if (ret)
		return ret;

	phys_beg = pci_resource_start(dev, 0);
	phys_len = pci_resource_len(dev, 0);

	if (!request_mem_region(phys_beg, phys_len,
				"CE4100 SPI")) {
		dev_err(&dev->dev, "Can't request register space.\n");
		ret = -EBUSY;
		return ret;
	}

	spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
	if (!spi_info) {
		ret = -ENOMEM;
		goto err_kz;
	}
	ssp = &spi_info->ssp;
	pdev = &spi_info->spi_pdev;
	spi_pdata =  &spi_info->spi_pdata;

	pdev->name = "pxa2xx-spi";
	pdev->id = dev->devfn;
	pdev->dev.parent = &dev->dev;
	pdev->dev.platform_data = &spi_info->spi_pdata;

#ifdef CONFIG_OF
	pdev->dev.of_node = dev->dev.of_node;
#endif
	pdev->dev.release = plat_dev_release;

	spi_pdata->num_chipselect = dev->devfn;

	ssp->phys_base = pci_resource_start(dev, 0);
	ssp->mmio_base = ioremap(phys_beg, phys_len);
	if (!ssp->mmio_base) {
		dev_err(&pdev->dev, "failed to ioremap() registers\n");
		ret = -EIO;
		goto err_remap;
	}
	ssp->irq = dev->irq;
	ssp->port_id = pdev->id;
	ssp->type = PXA25x_SSP;

	mutex_lock(&ssp_lock);
	list_add(&ssp->node, &ssp_list);
	mutex_unlock(&ssp_lock);

	pci_set_drvdata(dev, spi_info);

	ret = platform_device_register(pdev);
	if (ret)
		goto err_dev_add;

	return ret;

err_dev_add:
	pci_set_drvdata(dev, NULL);
	mutex_lock(&ssp_lock);
	list_del(&ssp->node);
	mutex_unlock(&ssp_lock);
	iounmap(ssp->mmio_base);

err_remap:
	kfree(spi_info);

err_kz:
	release_mem_region(phys_beg, phys_len);

	return ret;
}

static void __devexit ce4100_spi_remove(struct pci_dev *dev)
{
	struct awesome_struct *spi_info;
	struct platform_device *pdev;
	struct ssp_device *ssp;

	spi_info = pci_get_drvdata(dev);

	ssp = &spi_info->ssp;
	pdev = &spi_info->spi_pdev;

	platform_device_unregister(pdev);

	iounmap(ssp->mmio_base);
	release_mem_region(pci_resource_start(dev, 0),
			pci_resource_len(dev, 0));

	mutex_lock(&ssp_lock);
	list_del(&ssp->node);
	mutex_unlock(&ssp_lock);

	pci_set_drvdata(dev, NULL);
	pci_disable_device(dev);
	kfree(spi_info);
}

static struct pci_device_id ce4100_spi_devices[] __devinitdata = {

	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
	{ },
};
MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);

static struct pci_driver ce4100_spi_driver = {
	.name           = "ce4100_spi",
	.id_table       = ce4100_spi_devices,
	.probe          = ce4100_spi_probe,
	.remove         = __devexit_p(ce4100_spi_remove),
};

static int __init ce4100_spi_init(void)
{
	return pci_register_driver(&ce4100_spi_driver);
}
module_init(ce4100_spi_init);

static void __exit ce4100_spi_exit(void)
{
	pci_unregister_driver(&ce4100_spi_driver);
}
module_exit(ce4100_spi_exit);

MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");