USB: Add EHCI and OHCH glue for OCTEON II SOCs.

The OCTEON II SOC has USB EHCI and OHCI controllers connected directly
to the internal I/O bus.  This patch adds the necessary 'glue' logic
to allow ehci-hcd and ohci-hcd drivers to work on OCTEON II.

The OCTEON normally runs big-endian, and the ehci/ohci internal
registers have host endianness, so we need to select
USB_EHCI_BIG_ENDIAN_MMIO.

The ehci and ohci blocks share a common clocking and PHY
infrastructure.  Initialization of the host controller and PHY clocks
is common between the two and is factored out into the
octeon2-common.c file.

Setting of USB_ARCH_HAS_OHCI and USB_ARCH_HAS_EHCI is done in
arch/mips/Kconfig in a following patch.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-usb@vger.kernel.org
To: dbrownell@users.sourceforge.net
Patchwork: http://patchwork.linux-mips.org/patch/1675/
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 214 insertions, 0 deletions

diff --git a/drivers/usb/host/ohci-octeon.c b/drivers/usb/host/ohci-octeon.c
new file mode 100644
index 00000000000..e4ddfaf8870
--- /dev/null
+++ b/drivers/usb/host/ohci-octeon.c
@@ -0,0 +1,214 @@
+/*
+ * EHCI HCD glue for Cavium Octeon II SOCs.
+ *
+ * Loosely based on ehci-au1xxx.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2010 Cavium Networks
+ *
+ */
+
+#include <linux/platform_device.h>
+
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-uctlx-defs.h>
+
+#define OCTEON_OHCI_HCD_NAME "octeon-ohci"
+
+/* Common clock init code.  */
+void octeon2_usb_clocks_start(void);
+void octeon2_usb_clocks_stop(void);
+
+static void ohci_octeon_hw_start(void)
+{
+	union cvmx_uctlx_ohci_ctl ohci_ctl;
+
+	octeon2_usb_clocks_start();
+
+	ohci_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_OHCI_CTL(0));
+	ohci_ctl.s.l2c_addr_msb = 0;
+	ohci_ctl.s.l2c_buff_emod = 1; /* Byte swapped. */
+	ohci_ctl.s.l2c_desc_emod = 1; /* Byte swapped. */
+	cvmx_write_csr(CVMX_UCTLX_OHCI_CTL(0), ohci_ctl.u64);
+
+}
+
+static void ohci_octeon_hw_stop(void)
+{
+	/* Undo ohci_octeon_start() */
+	octeon2_usb_clocks_stop();
+}
+
+static int __devinit ohci_octeon_start(struct usb_hcd *hcd)
+{
+	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
+	int ret;
+
+	ret = ohci_init(ohci);
+
+	if (ret < 0)
+		return ret;
+
+	ret = ohci_run(ohci);
+
+	if (ret < 0) {
+		ohci_err(ohci, "can't start %s", hcd->self.bus_name);
+		ohci_stop(hcd);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct hc_driver ohci_octeon_hc_driver = {
+	.description		= hcd_name,
+	.product_desc		= "Octeon OHCI",
+	.hcd_priv_size		= sizeof(struct ohci_hcd),
+
+	/*
+	 * generic hardware linkage
+	 */
+	.irq =			ohci_irq,
+	.flags =		HCD_USB11 | HCD_MEMORY,
+
+	/*
+	 * basic lifecycle operations
+	 */
+	.start =		ohci_octeon_start,
+	.stop =			ohci_stop,
+	.shutdown =		ohci_shutdown,
+
+	/*
+	 * managing i/o requests and associated device resources
+	 */
+	.urb_enqueue =		ohci_urb_enqueue,
+	.urb_dequeue =		ohci_urb_dequeue,
+	.endpoint_disable =	ohci_endpoint_disable,
+
+	/*
+	 * scheduling support
+	 */
+	.get_frame_number =	ohci_get_frame,
+
+	/*
+	 * root hub support
+	 */
+	.hub_status_data =	ohci_hub_status_data,
+	.hub_control =		ohci_hub_control,
+
+	.start_port_reset =	ohci_start_port_reset,
+};
+
+static int ohci_octeon_drv_probe(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd;
+	struct ohci_hcd *ohci;
+	void *reg_base;
+	struct resource *res_mem;
+	int irq;
+	int ret;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "No irq assigned\n");
+		return -ENODEV;
+	}
+
+	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res_mem == NULL) {
+		dev_err(&pdev->dev, "No register space assigned\n");
+		return -ENODEV;
+	}
+
+	/* Ohci is a 32-bit device. */
+	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+	pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+
+	hcd = usb_create_hcd(&ohci_octeon_hc_driver, &pdev->dev, "octeon");
+	if (!hcd)
+		return -ENOMEM;
+
+	hcd->rsrc_start = res_mem->start;
+	hcd->rsrc_len = res_mem->end - res_mem->start + 1;
+
+	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
+				OCTEON_OHCI_HCD_NAME)) {
+		dev_err(&pdev->dev, "request_mem_region failed\n");
+		ret = -EBUSY;
+		goto err1;
+	}
+
+	reg_base = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+	if (!reg_base) {
+		dev_err(&pdev->dev, "ioremap failed\n");
+		ret = -ENOMEM;
+		goto err2;
+	}
+
+	ohci_octeon_hw_start();
+
+	hcd->regs = reg_base;
+
+	ohci = hcd_to_ohci(hcd);
+
+	/* Octeon OHCI matches CPU endianness. */
+#ifdef __BIG_ENDIAN
+	ohci->flags |= OHCI_QUIRK_BE_MMIO;
+#endif
+
+	ohci_hcd_init(ohci);
+
+	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
+	if (ret) {
+		dev_dbg(&pdev->dev, "failed to add hcd with err %d\n", ret);
+		goto err3;
+	}
+
+	platform_set_drvdata(pdev, hcd);
+
+	return 0;
+
+err3:
+	ohci_octeon_hw_stop();
+
+	iounmap(hcd->regs);
+err2:
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err1:
+	usb_put_hcd(hcd);
+	return ret;
+}
+
+static int ohci_octeon_drv_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+	usb_remove_hcd(hcd);
+
+	ohci_octeon_hw_stop();
+	iounmap(hcd->regs);
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+	usb_put_hcd(hcd);
+
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct platform_driver ohci_octeon_driver = {
+	.probe		= ohci_octeon_drv_probe,
+	.remove		= ohci_octeon_drv_remove,
+	.shutdown	= usb_hcd_platform_shutdown,
+	.driver = {
+		.name	= OCTEON_OHCI_HCD_NAME,
+		.owner	= THIS_MODULE,
+	}
+};
+
+MODULE_ALIAS("platform:" OCTEON_OHCI_HCD_NAME);