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 #ifdef CONFIG_OF
  93         pdev->dev.of_node = dev->dev.of_node;
  94 #endif
  95         ssp = &spi_info->ssp;
  96         ssp->phys_base = pci_resource_start(dev, 0);
  97         ssp->mmio_base = ioremap(phys_beg, phys_len);
  98         if (!ssp->mmio_base) {
  99                 dev_err(&pdev->dev, "failed to ioremap() registers\n");
 100                 ret = -EIO;
 101                 goto err_nomem;
 102         }
 103         ssp->irq = dev->irq;
 104         ssp->port_id = pdev->id;
 105         ssp->type = PXA25x_SSP;
 106
 107         mutex_lock(&ssp_lock);
 108         list_add(&ssp->node, &ssp_list);
 109         mutex_unlock(&ssp_lock);
 110
 111         pci_set_drvdata(dev, spi_info);
 112
 113         ret = platform_device_add(pdev);
 114         if (ret)
 115                 goto err_dev_add;
 116
 117         return ret;
 118
 119 err_dev_add:
 120         pci_set_drvdata(dev, NULL);
 121         mutex_lock(&ssp_lock);
 122         list_del(&ssp->node);
 123         mutex_unlock(&ssp_lock);
 124         iounmap(ssp->mmio_base);
 125
 126 err_nomem:
 127         release_mem_region(phys_beg, phys_len);
 128         platform_device_put(pdev);
 129         kfree(spi_info);
 130         return ret;
 131 }
 132
 133 static void __devexit ce4100_spi_remove(struct pci_dev *dev)
 134 {
 135         struct ce4100_info *spi_info;
 136         struct ssp_device *ssp;
 137
 138         spi_info = pci_get_drvdata(dev);
 139         ssp = &spi_info->ssp;
 140         platform_device_unregister(spi_info->spi_pdev);
 141
 142         iounmap(ssp->mmio_base);
 143         release_mem_region(pci_resource_start(dev, 0),
 144                         pci_resource_len(dev, 0));
 145
 146         mutex_lock(&ssp_lock);
 147         list_del(&ssp->node);
 148         mutex_unlock(&ssp_lock);
 149
 150         pci_set_drvdata(dev, NULL);
 151         pci_disable_device(dev);
 152         kfree(spi_info);
 153 }
 154
 155 static struct pci_device_id ce4100_spi_devices[] __devinitdata = {
 156         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
 157         { },
 158 };
 159 MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
 160
 161 static struct pci_driver ce4100_spi_driver = {
 162         .name           = "ce4100_spi",
 163         .id_table       = ce4100_spi_devices,
 164         .probe          = ce4100_spi_probe,
 165         .remove         = __devexit_p(ce4100_spi_remove),
 166 };
 167
 168 static int __init ce4100_spi_init(void)
 169 {
 170         return pci_register_driver(&ce4100_spi_driver);
 171 }
 172 module_init(ce4100_spi_init);
 173
 174 static void __exit ce4100_spi_exit(void)
 175 {
 176         pci_unregister_driver(&ce4100_spi_driver);
 177 }
 178 module_exit(ce4100_spi_exit);
 179
 180 MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
 181 MODULE_LICENSE("GPL v2");
 182 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");