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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>
Paul Gortmakerd7614de2011-07-03 15:44:29 -04008#include <linux/module.h>
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +01009#include <linux/spi/pxa2xx_spi.h>
10
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053011struct ce4100_info {
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010012 struct ssp_device ssp;
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053013 struct platform_device *spi_pdev;
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010014};
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
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010054static int __devinit ce4100_spi_probe(struct pci_dev *dev,
55 const struct pci_device_id *ent)
56{
57 int ret;
58 resource_size_t phys_beg;
59 resource_size_t phys_len;
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053060 struct ce4100_info *spi_info;
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010061 struct platform_device *pdev;
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053062 struct pxa2xx_spi_master spi_pdata;
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010063 struct ssp_device *ssp;
64
65 ret = pci_enable_device(dev);
66 if (ret)
67 return ret;
68
69 phys_beg = pci_resource_start(dev, 0);
70 phys_len = pci_resource_len(dev, 0);
71
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;
77 }
78
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053079 pdev = platform_device_alloc("pxa2xx-spi", dev->devfn);
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010080 spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053081 if (!pdev || !spi_info ) {
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010082 ret = -ENOMEM;
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053083 goto err_nomem;
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010084 }
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053085 memset(&spi_pdata, 0, sizeof(spi_pdata));
86 spi_pdata.num_chipselect = dev->devfn;
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010087
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053088 ret = platform_device_add_data(pdev, &spi_pdata, sizeof(spi_pdata));
89 if (ret)
90 goto err_nomem;
91
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010092 pdev->dev.parent = &dev->dev;
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010093 pdev->dev.of_node = dev->dev.of_node;
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +053094 ssp = &spi_info->ssp;
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +010095 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;
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +0530100 goto err_nomem;
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +0100101 }
102 ssp->irq = dev->irq;
103 ssp->port_id = pdev->id;
104 ssp->type = PXA25x_SSP;
105
106 mutex_lock(&ssp_lock);
107 list_add(&ssp->node, &ssp_list);
108 mutex_unlock(&ssp_lock);
109
110 pci_set_drvdata(dev, spi_info);
111
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +0530112 ret = platform_device_add(pdev);
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +0100113 if (ret)
114 goto err_dev_add;
115
116 return ret;
117
118err_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);
124
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +0530125err_nomem:
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +0100126 release_mem_region(phys_beg, phys_len);
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +0530127 platform_device_put(pdev);
128 kfree(spi_info);
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +0100129 return ret;
130}
131
132static void __devexit ce4100_spi_remove(struct pci_dev *dev)
133{
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +0530134 struct ce4100_info *spi_info;
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +0100135 struct ssp_device *ssp;
136
137 spi_info = pci_get_drvdata(dev);
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +0100138 ssp = &spi_info->ssp;
Sebastian Andrzej Siewior0f3e1d22011-02-03 00:31:21 +0530139 platform_device_unregister(spi_info->spi_pdev);
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +0100140
141 iounmap(ssp->mmio_base);
142 release_mem_region(pci_resource_start(dev, 0),
143 pci_resource_len(dev, 0));
144
145 mutex_lock(&ssp_lock);
146 list_del(&ssp->node);
147 mutex_unlock(&ssp_lock);
148
149 pci_set_drvdata(dev, NULL);
150 pci_disable_device(dev);
151 kfree(spi_info);
152}
153
Axel Line290cf22011-12-15 08:11:25 +0800154static DEFINE_PCI_DEVICE_TABLE(ce4100_spi_devices) = {
Sebastian Andrzej Siewiord6ea3df2010-11-24 10:17:14 +0100155 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
156 { },
157};
158MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
159
160static 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),
165};
166
167static int __init ce4100_spi_init(void)
168{
169 return pci_register_driver(&ce4100_spi_driver);
170}
171module_init(ce4100_spi_init);
172
173static void __exit ce4100_spi_exit(void)
174{
175 pci_unregister_driver(&ce4100_spi_driver);
176}
177module_exit(ce4100_spi_exit);
178
179MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
180MODULE_LICENSE("GPL v2");
181MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");