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>

4 files changed, 210 insertions, 6 deletions

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 78f9fd0..5377590 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -267,12 +267,15 @@ config SPI_PPC4xx
 
 config SPI_PXA2XX
 	tristate "PXA2xx SSP SPI master"
-	depends on ARCH_PXA && EXPERIMENTAL
-	select PXA_SSP
+	depends on (ARCH_PXA || (X86_32 && PCI)) && EXPERIMENTAL
+	select PXA_SSP if ARCH_PXA
 	help
-	  This enables using a PXA2xx SSP port as a SPI master controller.
-	  The driver can be configured to use any SSP port and additional
-	  documentation can be found a Documentation/spi/pxa2xx.
+	  This enables using a PXA2xx or Sodaville SSP port as a SPI master
+	  controller. The driver can be configured to use any SSP port and
+	  additional documentation can be found a Documentation/spi/pxa2xx.
+
+config SPI_PXA2XX_PCI
+	def_bool SPI_PXA2XX && X86_32 && PCI
 
 config SPI_S3C24XX
 	tristate "Samsung S3C24XX series SPI"
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 8bc1a5a..bdc4c40 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_SPI_GPIO)			+= spi_gpio.o
 obj-$(CONFIG_SPI_IMX)			+= spi_imx.o
 obj-$(CONFIG_SPI_LM70_LLP)		+= spi_lm70llp.o
 obj-$(CONFIG_SPI_PXA2XX)		+= pxa2xx_spi.o
+obj-$(CONFIG_SPI_PXA2XX_PCI)		+= pxa2xx_spi_pci.o
 obj-$(CONFIG_SPI_OMAP_UWIRE)		+= omap_uwire.o
 obj-$(CONFIG_SPI_OMAP24XX)		+= omap2_mcspi.o
 obj-$(CONFIG_SPI_OMAP_100K)		+= omap_spi_100k.o
diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
index 98d9c8b..ed212c2 100644
--- a/drivers/spi/pxa2xx_spi.c
+++ b/drivers/spi/pxa2xx_spi.c
@@ -28,7 +28,6 @@
 #include <linux/spi/spi.h>
 #include <linux/workqueue.h>
 #include <linux/delay.h>
-#include <linux/clk.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
 
diff --git a/drivers/spi/pxa2xx_spi_pci.c b/drivers/spi/pxa2xx_spi_pci.c
new file mode 100644
index 0000000..351d8a3
--- /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>");