Hi,
On Sat, Oct 9, 2010 at 3:17 AM, David Daney <ddaney@xxxxxxxxxxxxxxxxxx> wrote:
> 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@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/usb/host/Kconfig | 27 +++++-
> drivers/usb/host/Makefile | 1 +
> drivers/usb/host/ehci-hcd.c | 5 +
> drivers/usb/host/ehci-octeon.c | 207 +++++++++++++++++++++++++++++++++++
> drivers/usb/host/octeon2-common.c | 185 ++++++++++++++++++++++++++++++++
> drivers/usb/host/ohci-hcd.c | 5 +
> drivers/usb/host/ohci-octeon.c | 214 +++++++++++++++++++++++++++++++++++++
> 7 files changed, 643 insertions(+), 1 deletions(-)
> create mode 100644 drivers/usb/host/ehci-octeon.c
> create mode 100644 drivers/usb/host/octeon2-common.c
> create mode 100644 drivers/usb/host/ohci-octeon.c
>
It would be good to have EHCI and OHCI support in separate patches.
> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> index 2d926ce..a03d688 100644
> --- a/drivers/usb/host/Kconfig
> +++ b/drivers/usb/host/Kconfig
> @@ -93,7 +93,7 @@ config USB_EHCI_TT_NEWSCHED
>
> config USB_EHCI_BIG_ENDIAN_MMIO
> bool
> - depends on USB_EHCI_HCD && (PPC_CELLEB || PPC_PS3 || 440EPX || ARCH_IXP4XX || XPS_USB_HCD_XILINX)
> + depends on USB_EHCI_HCD && (PPC_CELLEB || PPC_PS3 || 440EPX || ARCH_IXP4XX || XPS_USB_HCD_XILINX || CPU_CAVIUM_OCTEON)
> default y
>
> config USB_EHCI_BIG_ENDIAN_DESC
> @@ -428,3 +428,28 @@ config USB_IMX21_HCD
> To compile this driver as a module, choose M here: the
> module will be called "imx21-hcd".
>
> +config USB_OCTEON_EHCI
> + bool "Octeon on-chip EHCI support"
> + depends on USB && USB_EHCI_HCD && CPU_CAVIUM_OCTEON
> + default n
> + select USB_EHCI_BIG_ENDIAN_MMIO
> + help
> + Enable support for the Octeon II SOC's on-chip EHCI
> + controller. It is needed for high-speed (480Mbit/sec)
> + USB 2.0 device support. All CN6XXX based chips with USB are
> + supported.
> +
> +config USB_OCTEON_OHCI
> + bool "Octeon on-chip OHCI support"
> + depends on USB && USB_OHCI_HCD && CPU_CAVIUM_OCTEON
> + default USB_OCTEON_EHCI
> + select USB_OHCI_BIG_ENDIAN_MMIO
> + select USB_OHCI_LITTLE_ENDIAN
> + help
> + Enable support for the Octeon II SOC's on-chip OHCI
> + controller. It is needed for low-speed USB 1.0 device
> + support. All CN6XXX based chips with USB are supported.
> +
> +config USB_OCTEON2_COMMON
> + bool
> + default y if USB_OCTEON_EHCI || USB_OCTEON_OHCI
> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> index b6315aa..36099ce 100644
> --- a/drivers/usb/host/Makefile
> +++ b/drivers/usb/host/Makefile
> @@ -33,4 +33,5 @@ obj-$(CONFIG_USB_R8A66597_HCD) += r8a66597-hcd.o
> obj-$(CONFIG_USB_ISP1760_HCD) += isp1760.o
> obj-$(CONFIG_USB_HWA_HCD) += hwa-hc.o
> obj-$(CONFIG_USB_IMX21_HCD) += imx21-hcd.o
> +obj-$(CONFIG_USB_OCTEON2_COMMON) += octeon2-common.o
>
> diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
> index 34a928d..158a520 100644
> --- a/drivers/usb/host/ehci-hcd.c
> +++ b/drivers/usb/host/ehci-hcd.c
> @@ -1197,6 +1197,11 @@ MODULE_LICENSE ("GPL");
> #define PLATFORM_DRIVER ehci_atmel_driver
> #endif
>
> +#ifdef CONFIG_USB_OCTEON_EHCI
> +#include "ehci-octeon.c"
> +#define PLATFORM_DRIVER ehci_octeon_driver
> +#endif
> +
> #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
> !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
> !defined(XILINX_OF_PLATFORM_DRIVER)
> diff --git a/drivers/usb/host/ehci-octeon.c b/drivers/usb/host/ehci-octeon.c
> new file mode 100644
> index 0000000..a31a031
> --- /dev/null
> +++ b/drivers/usb/host/ehci-octeon.c
> @@ -0,0 +1,207 @@
> +/*
> + * 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_EHCI_HCD_NAME "octeon-ehci"
> +
> +/* Common clock init code. */
> +void octeon2_usb_clocks_start(void);
> +void octeon2_usb_clocks_stop(void);
> +
> +static void ehci_octeon_start(void)
> +{
> + union cvmx_uctlx_ehci_ctl ehci_ctl;
> +
> + octeon2_usb_clocks_start();
> +
> + ehci_ctl.u64 = cvmx_read_csr(CVMX_UCTLX_EHCI_CTL(0));
> + /* Use 64-bit addressing. */
> + ehci_ctl.s.ehci_64b_addr_en = 1;
> + ehci_ctl.s.l2c_addr_msb = 0;
> + ehci_ctl.s.l2c_buff_emod = 1; /* Byte swapped. */
> + ehci_ctl.s.l2c_desc_emod = 1; /* Byte swapped. */
> + cvmx_write_csr(CVMX_UCTLX_EHCI_CTL(0), ehci_ctl.u64);
> +}
> +
> +static void ehci_octeon_stop(void)
> +{
> + octeon2_usb_clocks_stop();
> +}
> +
> +static const struct hc_driver ehci_octeon_hc_driver = {
> + .description = hcd_name,
> + .product_desc = "Octeon EHCI",
> + .hcd_priv_size = sizeof(struct ehci_hcd),
> +
> + /*
> + * generic hardware linkage
> + */
> + .irq = ehci_irq,
> + .flags = HCD_MEMORY | HCD_USB2,
> +
> + /*
> + * basic lifecycle operations
> + */
> + .reset = ehci_init,
> + .start = ehci_run,
> + .stop = ehci_stop,
> + .shutdown = ehci_shutdown,
> +
> + /*
> + * managing i/o requests and associated device resources
> + */
> + .urb_enqueue = ehci_urb_enqueue,
> + .urb_dequeue = ehci_urb_dequeue,
> + .endpoint_disable = ehci_endpoint_disable,
> + .endpoint_reset = ehci_endpoint_reset,
> +
> + /*
> + * scheduling support
> + */
> + .get_frame_number = ehci_get_frame,
> +
> + /*
> + * root hub support
> + */
> + .hub_status_data = ehci_hub_status_data,
> + .hub_control = ehci_hub_control,
> + .bus_suspend = ehci_bus_suspend,
> + .bus_resume = ehci_bus_resume,
> + .relinquish_port = ehci_relinquish_port,
> + .port_handed_over = ehci_port_handed_over,
> +
> + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
> +};
> +
> +static u64 ehci_octeon_dma_mask = DMA_BIT_MASK(64);
> +
> +static int ehci_octeon_drv_probe(struct platform_device *pdev)
> +{
> + struct usb_hcd *hcd;
> + struct ehci_hcd *ehci;
> + 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;
> + }
> +
> + /*
> + * We can DMA from anywhere. But the descriptors must be in
> + * the lower 4GB.
> + */
> + pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> + pdev->dev.dma_mask = &ehci_octeon_dma_mask;
> +
> + hcd = usb_create_hcd(&ehci_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;
You can use resource_size() to compute the length of the resource.
> +
> + if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
> + OCTEON_EHCI_HCD_NAME)) {
> + dev_err(&pdev->dev, "request_mem_region failed\n");
> + ret = -EBUSY;
> + goto err1;
> + }
> +
> + hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
> + if (!hcd->regs) {
> + dev_err(&pdev->dev, "ioremap failed\n");
> + ret = -ENOMEM;
> + goto err2;
> + }
> +
> + ehci_octeon_start();
> +
> + ehci = hcd_to_ehci(hcd);
> +
> + /* Octeon EHCI matches CPU endianness. */
> +#ifdef __BIG_ENDIAN
> + ehci->big_endian_mmio = 1;
> +#endif
> +
> + ehci->caps = hcd->regs;
> + ehci->regs = hcd->regs +
> + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
> + /* cache this readonly data; minimize chip reads */
> + ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
> +
> + 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);
> +
> + /* root ports should always stay powered */
> + ehci_port_power(ehci, 1);
> +
> + return 0;
> +err3:
> + ehci_octeon_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_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;
> +
Same here.
> + 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;
> +}
> +
Regards,
Maulik
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