spi/pxa2xx: Add CE4100 support
Sodaville's SPI controller is very much the same as in PXA25x. The
difference:
- The RX/TX FIFO is only 4 words deep instead of 16
- No DMA support
- The SPI controller offers a CS functionality
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
diff --git a/drivers/spi/pxa2xx_spi_pci.c b/drivers/spi/pxa2xx_spi_pci.c
new file mode 100644
index 0000000..351d8a375
--- /dev/null
+++ b/drivers/spi/pxa2xx_spi_pci.c
@@ -0,0 +1,201 @@
+/*
+ * CE4100's SPI device is more or less the same one as found on PXA
+ *
+ */
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/spi/pxa2xx_spi.h>
+
+struct awesome_struct {
+ struct ssp_device ssp;
+ struct platform_device spi_pdev;
+ struct pxa2xx_spi_master spi_pdata;
+};
+
+static DEFINE_MUTEX(ssp_lock);
+static LIST_HEAD(ssp_list);
+
+struct ssp_device *pxa_ssp_request(int port, const char *label)
+{
+ struct ssp_device *ssp = NULL;
+
+ mutex_lock(&ssp_lock);
+
+ list_for_each_entry(ssp, &ssp_list, node) {
+ if (ssp->port_id == port && ssp->use_count == 0) {
+ ssp->use_count++;
+ ssp->label = label;
+ break;
+ }
+ }
+
+ mutex_unlock(&ssp_lock);
+
+ if (&ssp->node == &ssp_list)
+ return NULL;
+
+ return ssp;
+}
+EXPORT_SYMBOL_GPL(pxa_ssp_request);
+
+void pxa_ssp_free(struct ssp_device *ssp)
+{
+ mutex_lock(&ssp_lock);
+ if (ssp->use_count) {
+ ssp->use_count--;
+ ssp->label = NULL;
+ } else
+ dev_err(&ssp->pdev->dev, "device already free\n");
+ mutex_unlock(&ssp_lock);
+}
+EXPORT_SYMBOL_GPL(pxa_ssp_free);
+
+static void plat_dev_release(struct device *dev)
+{
+ struct awesome_struct *as = container_of(dev,
+ struct awesome_struct, spi_pdev.dev);
+
+ of_device_node_put(&as->spi_pdev.dev);
+}
+
+static int __devinit ce4100_spi_probe(struct pci_dev *dev,
+ const struct pci_device_id *ent)
+{
+ int ret;
+ resource_size_t phys_beg;
+ resource_size_t phys_len;
+ struct awesome_struct *spi_info;
+ struct platform_device *pdev;
+ struct pxa2xx_spi_master *spi_pdata;
+ struct ssp_device *ssp;
+
+ ret = pci_enable_device(dev);
+ if (ret)
+ return ret;
+
+ phys_beg = pci_resource_start(dev, 0);
+ phys_len = pci_resource_len(dev, 0);
+
+ if (!request_mem_region(phys_beg, phys_len,
+ "CE4100 SPI")) {
+ dev_err(&dev->dev, "Can't request register space.\n");
+ ret = -EBUSY;
+ return ret;
+ }
+
+ spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
+ if (!spi_info) {
+ ret = -ENOMEM;
+ goto err_kz;
+ }
+ ssp = &spi_info->ssp;
+ pdev = &spi_info->spi_pdev;
+ spi_pdata = &spi_info->spi_pdata;
+
+ pdev->name = "pxa2xx-spi";
+ pdev->id = dev->devfn;
+ pdev->dev.parent = &dev->dev;
+ pdev->dev.platform_data = &spi_info->spi_pdata;
+
+#ifdef CONFIG_OF
+ pdev->dev.of_node = dev->dev.of_node;
+#endif
+ pdev->dev.release = plat_dev_release;
+
+ spi_pdata->num_chipselect = dev->devfn;
+
+ ssp->phys_base = pci_resource_start(dev, 0);
+ ssp->mmio_base = ioremap(phys_beg, phys_len);
+ if (!ssp->mmio_base) {
+ dev_err(&pdev->dev, "failed to ioremap() registers\n");
+ ret = -EIO;
+ goto err_remap;
+ }
+ ssp->irq = dev->irq;
+ ssp->port_id = pdev->id;
+ ssp->type = PXA25x_SSP;
+
+ mutex_lock(&ssp_lock);
+ list_add(&ssp->node, &ssp_list);
+ mutex_unlock(&ssp_lock);
+
+ pci_set_drvdata(dev, spi_info);
+
+ ret = platform_device_register(pdev);
+ if (ret)
+ goto err_dev_add;
+
+ return ret;
+
+err_dev_add:
+ pci_set_drvdata(dev, NULL);
+ mutex_lock(&ssp_lock);
+ list_del(&ssp->node);
+ mutex_unlock(&ssp_lock);
+ iounmap(ssp->mmio_base);
+
+err_remap:
+ kfree(spi_info);
+
+err_kz:
+ release_mem_region(phys_beg, phys_len);
+
+ return ret;
+}
+
+static void __devexit ce4100_spi_remove(struct pci_dev *dev)
+{
+ struct awesome_struct *spi_info;
+ struct platform_device *pdev;
+ struct ssp_device *ssp;
+
+ spi_info = pci_get_drvdata(dev);
+
+ ssp = &spi_info->ssp;
+ pdev = &spi_info->spi_pdev;
+
+ platform_device_unregister(pdev);
+
+ iounmap(ssp->mmio_base);
+ release_mem_region(pci_resource_start(dev, 0),
+ pci_resource_len(dev, 0));
+
+ mutex_lock(&ssp_lock);
+ list_del(&ssp->node);
+ mutex_unlock(&ssp_lock);
+
+ pci_set_drvdata(dev, NULL);
+ pci_disable_device(dev);
+ kfree(spi_info);
+}
+
+static struct pci_device_id ce4100_spi_devices[] __devinitdata = {
+
+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
+ { },
+};
+MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
+
+static struct pci_driver ce4100_spi_driver = {
+ .name = "ce4100_spi",
+ .id_table = ce4100_spi_devices,
+ .probe = ce4100_spi_probe,
+ .remove = __devexit_p(ce4100_spi_remove),
+};
+
+static int __init ce4100_spi_init(void)
+{
+ return pci_register_driver(&ce4100_spi_driver);
+}
+module_init(ce4100_spi_init);
+
+static void __exit ce4100_spi_exit(void)
+{
+ pci_unregister_driver(&ce4100_spi_driver);
+}
+module_exit(ce4100_spi_exit);
+
+MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");