USB: ISP1760 HCD driver

This driver has been written from scratch and supports the ISP1760. ISP1761
might (should) work as well but the OTG isn't supported. Also ISO packets are
not. However, it works on my little PowerPC board.

Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 298 insertions, 0 deletions

diff --git a/drivers/usb/host/isp1760-if.c b/drivers/usb/host/isp1760-if.c
new file mode 100644
index 000000000000..73fb2a38f1e4
--- /dev/null
+++ b/drivers/usb/host/isp1760-if.c
@@ -0,0 +1,298 @@
+/*
+ * Glue code for the ISP1760 driver and bus
+ * Currently there is support for
+ * - OpenFirmware
+ * - PCI
+ *
+ * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
+ *
+ */
+
+#include <linux/usb.h>
+#include <linux/io.h>
+
+#include "../core/hcd.h"
+#include "isp1760-hcd.h"
+
+#ifdef CONFIG_USB_ISP1760_OF
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#endif
+
+#ifdef CONFIG_USB_ISP1760_PCI
+#include <linux/pci.h>
+#endif
+
+#ifdef CONFIG_USB_ISP1760_OF
+static int of_isp1760_probe(struct of_device *dev,
+                const struct of_device_id *match)
+{
+        struct usb_hcd *hcd;
+        struct device_node *dp = dev->node;
+        struct resource *res;
+        struct resource memory;
+        struct of_irq oirq;
+        int virq;
+        u64 res_len;
+        int ret;
+
+        ret = of_address_to_resource(dp, 0, &memory);
+        if (ret)
+                return -ENXIO;
+
+        res = request_mem_region(memory.start, memory.end - memory.start + 1,
+                        dev->dev.bus_id);
+        if (!res)
+                return -EBUSY;
+
+        res_len = memory.end - memory.start + 1;
+
+        if (of_irq_map_one(dp, 0, &oirq)) {
+                ret = -ENODEV;
+                goto release_reg;
+        }
+
+        virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
+                        oirq.size);
+
+        hcd = isp1760_register(memory.start, res_len, virq,
+                IRQF_SHARED | IRQF_DISABLED, &dev->dev, dev->dev.bus_id);
+        if (IS_ERR(hcd)) {
+                ret = PTR_ERR(hcd);
+                goto release_reg;
+        }
+
+        dev_set_drvdata(&dev->dev, hcd);
+        return ret;
+
+release_reg:
+        release_mem_region(memory.start, memory.end - memory.start + 1);
+        return ret;
+}
+
+static int of_isp1760_remove(struct of_device *dev)
+{
+        struct usb_hcd *hcd = dev_get_drvdata(&dev->dev);
+
+        dev_set_drvdata(&dev->dev, NULL);
+
+        usb_remove_hcd(hcd);
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+        usb_put_hcd(hcd);
+        return 0;
+}
+
+static struct of_device_id of_isp1760_match[] = {
+        {
+                .compatible = "nxp,usb-isp1760",
+        },
+        { },
+};
+MODULE_DEVICE_TABLE(of, of_isp1760_match);
+
+static struct of_platform_driver isp1760_of_driver = {
+        .name           = "nxp-isp1760",
+        .match_table    = of_isp1760_match,
+        .probe          = of_isp1760_probe,
+        .remove         = of_isp1760_remove,
+};
+#endif
+
+#ifdef CONFIG_USB_ISP1760_PCI
+static u32 nxp_pci_io_base;
+static u32 iolength;
+static u32 pci_mem_phy0;
+static u32 length;
+static u8 *chip_addr;
+static u8 *iobase;
+
+static int __devinit isp1761_pci_probe(struct pci_dev *dev,
+                const struct pci_device_id *id)
+{
+        u8 latency, limit;
+        __u32 reg_data;
+        int retry_count;
+        int length;
+        int status = 1;
+        struct usb_hcd *hcd;
+
+        if (usb_disabled())
+                return -ENODEV;
+
+        if (pci_enable_device(dev) < 0)
+                return -ENODEV;
+
+        if (!dev->irq)
+                return -ENODEV;
+
+        /* Grab the PLX PCI mem maped port start address we need  */
+        nxp_pci_io_base = pci_resource_start(dev, 0);
+        iolength = pci_resource_len(dev, 0);
+
+        if (!request_mem_region(nxp_pci_io_base, iolength, "ISP1761 IO MEM")) {
+                printk(KERN_ERR "request region #1\n");
+                return -EBUSY;
+        }
+
+        iobase = ioremap_nocache(nxp_pci_io_base, iolength);
+        if (!iobase) {
+                printk(KERN_ERR "ioremap #1\n");
+                release_mem_region(nxp_pci_io_base, iolength);
+                return -ENOMEM;
+        }
+        /* Grab the PLX PCI shared memory of the ISP 1761 we need  */
+        pci_mem_phy0 = pci_resource_start(dev, 3);
+        length = pci_resource_len(dev, 3);
+
+        if (length < 0xffff) {
+                printk(KERN_ERR "memory length for this resource is less than "
+                                "required\n");
+                release_mem_region(nxp_pci_io_base, iolength);
+                iounmap(iobase);
+                return  -ENOMEM;
+        }
+
+        if (!request_mem_region(pci_mem_phy0, length, "ISP-PCI")) {
+                printk(KERN_ERR "host controller already in use\n");
+                release_mem_region(nxp_pci_io_base, iolength);
+                iounmap(iobase);
+                return -EBUSY;
+        }
+
+        /* bad pci latencies can contribute to overruns */
+        pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
+        if (latency) {
+                pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
+                if (limit && limit < latency)
+                        pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
+        }
+
+        /* Try to check whether we can access Scratch Register of
+         * Host Controller or not. The initial PCI access is retried until
+         * local init for the PCI bridge is completed
+         */
+        retry_count = 20;
+        reg_data = 0;
+        while ((reg_data != 0xFACE) && retry_count) {
+                /*by default host is in 16bit mode, so
+                 * io operations at this stage must be 16 bit
+                 * */
+                writel(0xface, chip_addr + HC_SCRATCH_REG);
+                udelay(100);
+                reg_data = readl(chip_addr + HC_SCRATCH_REG);
+                retry_count--;
+        }
+
+        /* Host Controller presence is detected by writing to scratch register
+         * and reading back and checking the contents are same or not
+         */
+        if (reg_data != 0xFACE) {
+                err("scratch register mismatch %x", reg_data);
+                goto clean;
+        }
+
+        pci_set_master(dev);
+
+        status = readl(iobase + 0x68);
+        status |= 0x900;
+        writel(status, iobase + 0x68);
+
+        dev->dev.dma_mask = NULL;
+        hcd = isp1760_register(pci_mem_phy0, length, dev->irq,
+                IRQF_SHARED | IRQF_DISABLED, &dev->dev, dev->dev.bus_id);
+        pci_set_drvdata(dev, hcd);
+        if (!hcd)
+                return 0;
+clean:
+        status = -ENODEV;
+        iounmap(iobase);
+        release_mem_region(pci_mem_phy0, length);
+        release_mem_region(nxp_pci_io_base, iolength);
+        return status;
+}
+static void isp1761_pci_remove(struct pci_dev *dev)
+{
+        struct usb_hcd *hcd;
+
+        hcd = pci_get_drvdata(dev);
+
+        usb_remove_hcd(hcd);
+        iounmap(hcd->regs);
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+        usb_put_hcd(hcd);
+
+        pci_disable_device(dev);
+
+        iounmap(iobase);
+        iounmap(chip_addr);
+
+        release_mem_region(nxp_pci_io_base, iolength);
+        release_mem_region(pci_mem_phy0, length);
+}
+
+static void isp1761_pci_shutdown(struct pci_dev *dev)
+{
+        printk(KERN_ERR "ips1761_pci_shutdown\n");
+}
+
+static const struct pci_device_id isp1760_plx [] = { {
+        /* handle any USB 2.0 EHCI controller */
+        PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_OTHER << 8) | (0x06 << 16)), ~0),
+                .driver_data = 0,
+},
+{ /* end: all zeroes */ }
+};
+MODULE_DEVICE_TABLE(pci, isp1760_plx);
+
+static struct pci_driver isp1761_pci_driver = {
+        .name =         "isp1760",
+        .id_table =     isp1760_plx,
+        .probe =        isp1761_pci_probe,
+        .remove =       isp1761_pci_remove,
+        .shutdown =     isp1761_pci_shutdown,
+};
+#endif
+
+static int __init isp1760_init(void)
+{
+        int ret;
+
+        init_kmem_once();
+
+#ifdef CONFIG_USB_ISP1760_OF
+        ret = of_register_platform_driver(&isp1760_of_driver);
+        if (ret) {
+                deinit_kmem_cache();
+                return ret;
+        }
+#endif
+#ifdef CONFIG_USB_ISP1760_PCI
+        ret = pci_register_driver(&isp1761_pci_driver);
+        if (ret)
+                goto unreg_of;
+#endif
+        return ret;
+
+#ifdef CONFIG_USB_ISP1760_PCI
+unreg_of:
+#endif
+#ifdef CONFIG_USB_ISP1760_OF
+        of_unregister_platform_driver(&isp1760_of_driver);
+#endif
+        deinit_kmem_cache();
+        return ret;
+}
+module_init(isp1760_init);
+
+static void __exit isp1760_exit(void)
+{
+#ifdef CONFIG_USB_ISP1760_OF
+        of_unregister_platform_driver(&isp1760_of_driver);
+#endif
+#ifdef CONFIG_USB_ISP1760_PCI
+        pci_unregister_driver(&isp1761_pci_driver);
+#endif
+        deinit_kmem_cache();
+}
+module_exit(isp1760_exit);