blob: 351d8a375b57c33ee36021f1050ae103567c3bb6 [file] [log] [blame]
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +01001/*
2 * CE4100's SPI device is more or less the same one as found on PXA
3 *
4 */
5#include <linux/pci.h>
6#include <linux/platform_device.h>
7#include <linux/of_device.h>
8#include <linux/spi/pxa2xx_spi.h>
9
10struct awesome_struct {
11 struct ssp_device ssp;
12 struct platform_device spi_pdev;
13 struct pxa2xx_spi_master spi_pdata;
14};
15
16static DEFINE_MUTEX(ssp_lock);
17static LIST_HEAD(ssp_list);
18
19struct ssp_device *pxa_ssp_request(int port, const char *label)
20{
21 struct ssp_device *ssp = NULL;
22
23 mutex_lock(&ssp_lock);
24
25 list_for_each_entry(ssp, &ssp_list, node) {
26 if (ssp->port_id == port && ssp->use_count == 0) {
27 ssp->use_count++;
28 ssp->label = label;
29 break;
30 }
31 }
32
33 mutex_unlock(&ssp_lock);
34
35 if (&ssp->node == &ssp_list)
36 return NULL;
37
38 return ssp;
39}
40EXPORT_SYMBOL_GPL(pxa_ssp_request);
41
42void pxa_ssp_free(struct ssp_device *ssp)
43{
44 mutex_lock(&ssp_lock);
45 if (ssp->use_count) {
46 ssp->use_count--;
47 ssp->label = NULL;
48 } else
49 dev_err(&ssp->pdev->dev, "device already free\n");
50 mutex_unlock(&ssp_lock);
51}
52EXPORT_SYMBOL_GPL(pxa_ssp_free);
53
54static void plat_dev_release(struct device *dev)
55{
56 struct awesome_struct *as = container_of(dev,
57 struct awesome_struct, spi_pdev.dev);
58
59 of_device_node_put(&as->spi_pdev.dev);
60}
61
62static int __devinit ce4100_spi_probe(struct pci_dev *dev,
63 const struct pci_device_id *ent)
64{
65 int ret;
66 resource_size_t phys_beg;
67 resource_size_t phys_len;
68 struct awesome_struct *spi_info;
69 struct platform_device *pdev;
70 struct pxa2xx_spi_master *spi_pdata;
71 struct ssp_device *ssp;
72
73 ret = pci_enable_device(dev);
74 if (ret)
75 return ret;
76
77 phys_beg = pci_resource_start(dev, 0);
78 phys_len = pci_resource_len(dev, 0);
79
80 if (!request_mem_region(phys_beg, phys_len,
81 "CE4100 SPI")) {
82 dev_err(&dev->dev, "Can't request register space.\n");
83 ret = -EBUSY;
84 return ret;
85 }
86
87 spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
88 if (!spi_info) {
89 ret = -ENOMEM;
90 goto err_kz;
91 }
92 ssp = &spi_info->ssp;
93 pdev = &spi_info->spi_pdev;
94 spi_pdata = &spi_info->spi_pdata;
95
96 pdev->name = "pxa2xx-spi";
97 pdev->id = dev->devfn;
98 pdev->dev.parent = &dev->dev;
99 pdev->dev.platform_data = &spi_info->spi_pdata;
100
101#ifdef CONFIG_OF
102 pdev->dev.of_node = dev->dev.of_node;
103#endif
104 pdev->dev.release = plat_dev_release;
105
106 spi_pdata->num_chipselect = dev->devfn;
107
108 ssp->phys_base = pci_resource_start(dev, 0);
109 ssp->mmio_base = ioremap(phys_beg, phys_len);
110 if (!ssp->mmio_base) {
111 dev_err(&pdev->dev, "failed to ioremap() registers\n");
112 ret = -EIO;
113 goto err_remap;
114 }
115 ssp->irq = dev->irq;
116 ssp->port_id = pdev->id;
117 ssp->type = PXA25x_SSP;
118
119 mutex_lock(&ssp_lock);
120 list_add(&ssp->node, &ssp_list);
121 mutex_unlock(&ssp_lock);
122
123 pci_set_drvdata(dev, spi_info);
124
125 ret = platform_device_register(pdev);
126 if (ret)
127 goto err_dev_add;
128
129 return ret;
130
131err_dev_add:
132 pci_set_drvdata(dev, NULL);
133 mutex_lock(&ssp_lock);
134 list_del(&ssp->node);
135 mutex_unlock(&ssp_lock);
136 iounmap(ssp->mmio_base);
137
138err_remap:
139 kfree(spi_info);
140
141err_kz:
142 release_mem_region(phys_beg, phys_len);
143
144 return ret;
145}
146
147static void __devexit ce4100_spi_remove(struct pci_dev *dev)
148{
149 struct awesome_struct *spi_info;
150 struct platform_device *pdev;
151 struct ssp_device *ssp;
152
153 spi_info = pci_get_drvdata(dev);
154
155 ssp = &spi_info->ssp;
156 pdev = &spi_info->spi_pdev;
157
158 platform_device_unregister(pdev);
159
160 iounmap(ssp->mmio_base);
161 release_mem_region(pci_resource_start(dev, 0),
162 pci_resource_len(dev, 0));
163
164 mutex_lock(&ssp_lock);
165 list_del(&ssp->node);
166 mutex_unlock(&ssp_lock);
167
168 pci_set_drvdata(dev, NULL);
169 pci_disable_device(dev);
170 kfree(spi_info);
171}
172
173static struct pci_device_id ce4100_spi_devices[] __devinitdata = {
174
175 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
176 { },
177};
178MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
179
180static struct pci_driver ce4100_spi_driver = {
181 .name = "ce4100_spi",
182 .id_table = ce4100_spi_devices,
183 .probe = ce4100_spi_probe,
184 .remove = __devexit_p(ce4100_spi_remove),
185};
186
187static int __init ce4100_spi_init(void)
188{
189 return pci_register_driver(&ce4100_spi_driver);
190}
191module_init(ce4100_spi_init);
192
193static void __exit ce4100_spi_exit(void)
194{
195 pci_unregister_driver(&ce4100_spi_driver);
196}
197module_exit(ce4100_spi_exit);
198
199MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
200MODULE_LICENSE("GPL v2");
201MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");