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