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 awesome_struct {
  11         struct ssp_device ssp;
  12         struct platform_device spi_pdev;
  13         struct pxa2xx_spi_master spi_pdata;
  14 };
  15
  16 static DEFINE_MUTEX(ssp_lock);
  17 static LIST_HEAD(ssp_list);
  18
  19 struct 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 }
  40 EXPORT_SYMBOL_GPL(pxa_ssp_request);
  41
  42 void 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 }
  52 EXPORT_SYMBOL_GPL(pxa_ssp_free);
  53
  54 static 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
  62 static 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         pdev->dev.of_node = dev->dev.of_node;
 102         pdev->dev.release = plat_dev_release;
 103
 104         spi_pdata->num_chipselect = dev->devfn;
 105
 106         ssp->phys_base = pci_resource_start(dev, 0);
 107         ssp->mmio_base = ioremap(phys_beg, phys_len);
 108         if (!ssp->mmio_base) {
 109                 dev_err(&pdev->dev, "failed to ioremap() registers\n");
 110                 ret = -EIO;
 111                 goto err_remap;
 112         }
 113         ssp->irq = dev->irq;
 114         ssp->port_id = pdev->id;
 115         ssp->type = PXA25x_SSP;
 116
 117         mutex_lock(&ssp_lock);
 118         list_add(&ssp->node, &ssp_list);
 119         mutex_unlock(&ssp_lock);
 120
 121         pci_set_drvdata(dev, spi_info);
 122
 123         ret = platform_device_register(pdev);
 124         if (ret)
 125                 goto err_dev_add;
 126
 127         return ret;
 128
 129 err_dev_add:
 130         pci_set_drvdata(dev, NULL);
 131         mutex_lock(&ssp_lock);
 132         list_del(&ssp->node);
 133         mutex_unlock(&ssp_lock);
 134         iounmap(ssp->mmio_base);
 135
 136 err_remap:
 137         kfree(spi_info);
 138
 139 err_kz:
 140         release_mem_region(phys_beg, phys_len);
 141
 142         return ret;
 143 }
 144
 145 static void __devexit ce4100_spi_remove(struct pci_dev *dev)
 146 {
 147         struct awesome_struct *spi_info;
 148         struct platform_device *pdev;
 149         struct ssp_device *ssp;
 150
 151         spi_info = pci_get_drvdata(dev);
 152
 153         ssp = &spi_info->ssp;
 154         pdev = &spi_info->spi_pdev;
 155
 156         platform_device_unregister(pdev);
 157
 158         iounmap(ssp->mmio_base);
 159         release_mem_region(pci_resource_start(dev, 0),
 160                         pci_resource_len(dev, 0));
 161
 162         mutex_lock(&ssp_lock);
 163         list_del(&ssp->node);
 164         mutex_unlock(&ssp_lock);
 165
 166         pci_set_drvdata(dev, NULL);
 167         pci_disable_device(dev);
 168         kfree(spi_info);
 169 }
 170
 171 static struct pci_device_id ce4100_spi_devices[] __devinitdata = {
 172
 173         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
 174         { },
 175 };
 176 MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
 177
 178 static struct pci_driver ce4100_spi_driver = {
 179         .name           = "ce4100_spi",
 180         .id_table       = ce4100_spi_devices,
 181         .probe          = ce4100_spi_probe,
 182         .remove         = __devexit_p(ce4100_spi_remove),
 183 };
 184
 185 static int __init ce4100_spi_init(void)
 186 {
 187         return pci_register_driver(&ce4100_spi_driver);
 188 }
 189 module_init(ce4100_spi_init);
 190
 191 static void __exit ce4100_spi_exit(void)
 192 {
 193         pci_unregister_driver(&ce4100_spi_driver);
 194 }
 195 module_exit(ce4100_spi_exit);
 196
 197 MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
 198 MODULE_LICENSE("GPL v2");
 199 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");