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[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / spi / spi-pxa2xx-pci.c
blob8caa07d58e69cc4f9097ae33fe10a6b3ff2a26e8
1 /*
2 * CE4100's SPI device is more or less the same one as found on PXA
4 */
5 #include <linux/pci.h>
6 #include <linux/platform_device.h>
7 #include <linux/of_device.h>
8 #include <linux/module.h>
9 #include <linux/spi/pxa2xx_spi.h>
11 struct ce4100_info {
12 struct ssp_device ssp;
13 struct platform_device *spi_pdev;
16 static DEFINE_MUTEX(ssp_lock);
17 static LIST_HEAD(ssp_list);
19 struct ssp_device *pxa_ssp_request(int port, const char *label)
21 struct ssp_device *ssp = NULL;
23 mutex_lock(&ssp_lock);
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;
33 mutex_unlock(&ssp_lock);
35 if (&ssp->node == &ssp_list)
36 return NULL;
38 return ssp;
40 EXPORT_SYMBOL_GPL(pxa_ssp_request);
42 void pxa_ssp_free(struct ssp_device *ssp)
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);
52 EXPORT_SYMBOL_GPL(pxa_ssp_free);
54 static int __devinit ce4100_spi_probe(struct pci_dev *dev,
55 const struct pci_device_id *ent)
57 int ret;
58 resource_size_t phys_beg;
59 resource_size_t phys_len;
60 struct ce4100_info *spi_info;
61 struct platform_device *pdev;
62 struct pxa2xx_spi_master spi_pdata;
63 struct ssp_device *ssp;
65 ret = pci_enable_device(dev);
66 if (ret)
67 return ret;
69 phys_beg = pci_resource_start(dev, 0);
70 phys_len = pci_resource_len(dev, 0);
72 if (!request_mem_region(phys_beg, phys_len,
73 "CE4100 SPI")) {
74 dev_err(&dev->dev, "Can't request register space.\n");
75 ret = -EBUSY;
76 return ret;
79 pdev = platform_device_alloc("pxa2xx-spi", dev->devfn);
80 spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
81 if (!pdev || !spi_info ) {
82 ret = -ENOMEM;
83 goto err_nomem;
85 memset(&spi_pdata, 0, sizeof(spi_pdata));
86 spi_pdata.num_chipselect = dev->devfn;
88 ret = platform_device_add_data(pdev, &spi_pdata, sizeof(spi_pdata));
89 if (ret)
90 goto err_nomem;
92 pdev->dev.parent = &dev->dev;
93 pdev->dev.of_node = dev->dev.of_node;
94 ssp = &spi_info->ssp;
95 ssp->phys_base = pci_resource_start(dev, 0);
96 ssp->mmio_base = ioremap(phys_beg, phys_len);
97 if (!ssp->mmio_base) {
98 dev_err(&pdev->dev, "failed to ioremap() registers\n");
99 ret = -EIO;
100 goto err_nomem;
102 ssp->irq = dev->irq;
103 ssp->port_id = pdev->id;
104 ssp->type = PXA25x_SSP;
106 mutex_lock(&ssp_lock);
107 list_add(&ssp->node, &ssp_list);
108 mutex_unlock(&ssp_lock);
110 pci_set_drvdata(dev, spi_info);
112 ret = platform_device_add(pdev);
113 if (ret)
114 goto err_dev_add;
116 return ret;
118 err_dev_add:
119 pci_set_drvdata(dev, NULL);
120 mutex_lock(&ssp_lock);
121 list_del(&ssp->node);
122 mutex_unlock(&ssp_lock);
123 iounmap(ssp->mmio_base);
125 err_nomem:
126 release_mem_region(phys_beg, phys_len);
127 platform_device_put(pdev);
128 kfree(spi_info);
129 return ret;
132 static void __devexit ce4100_spi_remove(struct pci_dev *dev)
134 struct ce4100_info *spi_info;
135 struct ssp_device *ssp;
137 spi_info = pci_get_drvdata(dev);
138 ssp = &spi_info->ssp;
139 platform_device_unregister(spi_info->spi_pdev);
141 iounmap(ssp->mmio_base);
142 release_mem_region(pci_resource_start(dev, 0),
143 pci_resource_len(dev, 0));
145 mutex_lock(&ssp_lock);
146 list_del(&ssp->node);
147 mutex_unlock(&ssp_lock);
149 pci_set_drvdata(dev, NULL);
150 pci_disable_device(dev);
151 kfree(spi_info);
154 static struct pci_device_id ce4100_spi_devices[] __devinitdata = {
155 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
156 { },
158 MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
160 static struct pci_driver ce4100_spi_driver = {
161 .name = "ce4100_spi",
162 .id_table = ce4100_spi_devices,
163 .probe = ce4100_spi_probe,
164 .remove = __devexit_p(ce4100_spi_remove),
167 static int __init ce4100_spi_init(void)
169 return pci_register_driver(&ce4100_spi_driver);
171 module_init(ce4100_spi_init);
173 static void __exit ce4100_spi_exit(void)
175 pci_unregister_driver(&ce4100_spi_driver);
177 module_exit(ce4100_spi_exit);
179 MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
180 MODULE_LICENSE("GPL v2");
181 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");