drivers/spi/spi-pxa2xx-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/module.h>
   9 #include <linux/spi/pxa2xx_spi.h>
  10
  11 struct ce4100_info {
  12         struct ssp_device ssp;
  13         struct platform_device *spi_pdev;
  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 int 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;
  60         struct ce4100_info *spi_info;
  61         struct platform_device *pdev;
  62         struct pxa2xx_spi_master spi_pdata;
  63         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
  79         pdev = platform_device_alloc("pxa2xx-spi", dev->devfn);
  80         spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
  81         if (!pdev || !spi_info ) {
  82                 ret = -ENOMEM;
  83                 goto err_nomem;
  84         }
  85         memset(&spi_pdata, 0, sizeof(spi_pdata));
  86         spi_pdata.num_chipselect = dev->devfn;
  87
  88         ret = platform_device_add_data(pdev, &spi_pdata, sizeof(spi_pdata));
  89         if (ret)
  90                 goto err_nomem;
  91
  92         pdev->dev.parent = &dev->dev;
  93         pdev->dev.of_node = dev->dev.of_node;
  94         ssp = &spi_info->ssp;
  95         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;
 100                 goto err_nomem;
 101         }
 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
 112         ret = platform_device_add(pdev);
 113         if (ret)
 114                 goto err_dev_add;
 115
 116         return ret;
 117
 118 err_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
 125 err_nomem:
 126         release_mem_region(phys_beg, phys_len);
 127         platform_device_put(pdev);
 128         kfree(spi_info);
 129         return ret;
 130 }
 131
 132 static void ce4100_spi_remove(struct pci_dev *dev)
 133 {
 134         struct ce4100_info *spi_info;
 135         struct ssp_device *ssp;
 136
 137         spi_info = pci_get_drvdata(dev);
 138         ssp = &spi_info->ssp;
 139         platform_device_unregister(spi_info->spi_pdev);
 140
 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
 154 static DEFINE_PCI_DEVICE_TABLE(ce4100_spi_devices) = {
 155         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
 156         { },
 157 };
 158 MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
 159
 160 static struct pci_driver ce4100_spi_driver = {
 161         .name           = "ce4100_spi",
 162         .id_table       = ce4100_spi_devices,
 163         .probe          = ce4100_spi_probe,
 164         .remove         = ce4100_spi_remove,
 165 };
 166
 167 module_pci_driver(ce4100_spi_driver);
 168
 169 MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
 170 MODULE_LICENSE("GPL v2");
 171 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");