drivers/spi/pxa2xx_spi_pci.c

   1 /*
   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
  10 struct ce4100_info {
  11         struct ssp_device ssp;
  12         struct platform_device *spi_pdev;
  13 };
  14
  15 static DEFINE_MUTEX(ssp_lock);
  16 static LIST_HEAD(ssp_list);
  17
  18 struct ssp_device *pxa_ssp_request(int port, const char *label)
  19 {
  20         struct ssp_device *ssp = NULL;
  21
  22         mutex_lock(&ssp_lock);
  23
  24         list_for_each_entry(ssp, &ssp_list, node) {
  25                 if (ssp->port_id == port && ssp->use_count == 0) {
  26                         ssp->use_count++;
  27                         ssp->label = label;
  28                         break;
  29                 }
  30         }
  31
  32         mutex_unlock(&ssp_lock);
  33
  34         if (&ssp->node == &ssp_list)
  35                 return NULL;
  36
  37         return ssp;
  38 }
  39 EXPORT_SYMBOL_GPL(pxa_ssp_request);
  40
  41 void pxa_ssp_free(struct ssp_device *ssp)
  42 {
  43         mutex_lock(&ssp_lock);
  44         if (ssp->use_count) {
  45                 ssp->use_count--;
  46                 ssp->label = NULL;
  47         } else
  48                 dev_err(&ssp->pdev->dev, "device already free\n");
  49         mutex_unlock(&ssp_lock);
  50 }
  51 EXPORT_SYMBOL_GPL(pxa_ssp_free);
  52
  53 static int __devinit ce4100_spi_probe(struct pci_dev *dev,
  54                 const struct pci_device_id *ent)
  55 {
  56         int ret;
  57         resource_size_t phys_beg;
  58         resource_size_t phys_len;
  59         struct ce4100_info *spi_info;
  60         struct platform_device *pdev;
  61         struct pxa2xx_spi_master spi_pdata;
  62         struct ssp_device *ssp;
  63
  64         ret = pci_enable_device(dev);
  65         if (ret)
  66                 return ret;
  67
  68         phys_beg = pci_resource_start(dev, 0);
  69         phys_len = pci_resource_len(dev, 0);
  70
  71         if (!request_mem_region(phys_beg, phys_len,
  72                                 "CE4100 SPI")) {
  73                 dev_err(&dev->dev, "Can't request register space.\n");
  74                 ret = -EBUSY;
  75                 return ret;
  76         }
  77
  78         pdev = platform_device_alloc("pxa2xx-spi", dev->devfn);
  79         spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
  80         if (!pdev || !spi_info ) {
  81                 ret = -ENOMEM;
  82                 goto err_nomem;
  83         }
  84         memset(&spi_pdata, 0, sizeof(spi_pdata));
  85         spi_pdata.num_chipselect = dev->devfn;
  86
  87         ret = platform_device_add_data(pdev, &spi_pdata, sizeof(spi_pdata));
  88         if (ret)
  89                 goto err_nomem;
  90
  91         pdev->dev.parent = &dev->dev;
  92         pdev->dev.of_node = dev->dev.of_node;
  93         ssp = &spi_info->ssp;
  94         ssp->phys_base = pci_resource_start(dev, 0);
  95         ssp->mmio_base = ioremap(phys_beg, phys_len);
  96         if (!ssp->mmio_base) {
  97                 dev_err(&pdev->dev, "failed to ioremap() registers\n");
  98                 ret = -EIO;
  99                 goto err_nomem;
 100         }
 101         ssp->irq = dev->irq;
 102         ssp->port_id = pdev->id;
 103         ssp->type = PXA25x_SSP;
 104
 105         mutex_lock(&ssp_lock);
 106         list_add(&ssp->node, &ssp_list);
 107         mutex_unlock(&ssp_lock);
 108
 109         pci_set_drvdata(dev, spi_info);
 110
 111         ret = platform_device_add(pdev);
 112         if (ret)
 113                 goto err_dev_add;
 114
 115         return ret;
 116
 117 err_dev_add:
 118         pci_set_drvdata(dev, NULL);
 119         mutex_lock(&ssp_lock);
 120         list_del(&ssp->node);
 121         mutex_unlock(&ssp_lock);
 122         iounmap(ssp->mmio_base);
 123
 124 err_nomem:
 125         release_mem_region(phys_beg, phys_len);
 126         platform_device_put(pdev);
 127         kfree(spi_info);
 128         return ret;
 129 }
 130
 131 static void __devexit ce4100_spi_remove(struct pci_dev *dev)
 132 {
 133         struct ce4100_info *spi_info;
 134         struct ssp_device *ssp;
 135
 136         spi_info = pci_get_drvdata(dev);
 137         ssp = &spi_info->ssp;
 138         platform_device_unregister(spi_info->spi_pdev);
 139
 140         iounmap(ssp->mmio_base);
 141         release_mem_region(pci_resource_start(dev, 0),
 142                         pci_resource_len(dev, 0));
 143
 144         mutex_lock(&ssp_lock);
 145         list_del(&ssp->node);
 146         mutex_unlock(&ssp_lock);
 147
 148         pci_set_drvdata(dev, NULL);
 149         pci_disable_device(dev);
 150         kfree(spi_info);
 151 }
 152
 153 static struct pci_device_id ce4100_spi_devices[] __devinitdata = {
 154         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
 155         { },
 156 };
 157 MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
 158
 159 static struct pci_driver ce4100_spi_driver = {
 160         .name           = "ce4100_spi",
 161         .id_table       = ce4100_spi_devices,
 162         .probe          = ce4100_spi_probe,
 163         .remove         = __devexit_p(ce4100_spi_remove),
 164 };
 165
 166 static int __init ce4100_spi_init(void)
 167 {
 168         return pci_register_driver(&ce4100_spi_driver);
 169 }
 170 module_init(ce4100_spi_init);
 171
 172 static void __exit ce4100_spi_exit(void)
 173 {
 174         pci_unregister_driver(&ce4100_spi_driver);
 175 }
 176 module_exit(ce4100_spi_exit);
 177
 178 MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
 179 MODULE_LICENSE("GPL v2");
 180 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");