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Subject[PATCH V6 4/5] USB: Add EHCI bus glue for Loongson1x SoCs
Date
The Loongson1x SoCs have a built-in EHCI controller.
This patch adds the necessary glue code to make the generic EHCI
driver usable for them.

Signed-off-by: Kelvin Cheung <keguang.zhang@gmail.com>
---
drivers/usb/Kconfig | 1 +
drivers/usb/host/ehci-hcd.c | 5 +
drivers/usb/host/ehci-ls1x.c | 170 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 176 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/host/ehci-ls1x.c
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 85d5a01..78ac78b 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -68,6 +68,7 @@ config USB_ARCH_HAS_EHCI
default y if ARCH_MSM
default y if MICROBLAZE
default y if SPARC_LEON
+ default y if MACH_LOONGSON1
default PCI

# ARM SA1111 chips have a non-PCI based "OHCI-compatible" USB host interface.
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 47aa22d..d38bd7c 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1291,6 +1291,11 @@ MODULE_LICENSE ("GPL");
#define PLATFORM_DRIVER ehci_grlib_driver
#endif

+#ifdef CONFIG_MACH_LOONGSON1
+#include "ehci-ls1x.c"
+#define PLATFORM_DRIVER ehci_ls1x_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-ls1x.c b/drivers/usb/host/ehci-ls1x.c
new file mode 100644
index 0000000..d3b6720
--- /dev/null
+++ b/drivers/usb/host/ehci-ls1x.c
@@ -0,0 +1,170 @@
+/*
+ * Bus Glue for Loongson LS1X built-in EHCI controller.
+ *
+ * Copyright (c) 2012 Zhang, Keguang <keguang.zhang@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+
+#include <linux/platform_device.h>
+
+static int ehci_ls1x_setup(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int ret;
+
+ ehci->caps = hcd->regs;
+ ehci->regs = hcd->regs +
+ HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
+ dbg_hcs_params(ehci, "reset");
+ dbg_hcc_params(ehci, "reset");
+
+ /* cache this readonly data; minimize chip reads */
+ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+ ehci->sbrn = 0x20;
+
+ ehci_reset(ehci);
+
+ /* data structure init */
+ ret = ehci_init(hcd);
+ if (ret)
+ return ret;
+
+ ehci_port_power(ehci, 0);
+
+ return 0;
+}
+
+static const struct hc_driver ehci_ls1x_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "LOONGSON1 EHCI",
+ .hcd_priv_size = sizeof(struct ehci_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+ .irq = ehci_irq,
+ .flags = HCD_MEMORY | HCD_USB2,
+
+ /*
+ * basic lifecycle operations
+ */
+ .reset = ehci_ls1x_setup,
+ .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,
+ .relinquish_port = ehci_relinquish_port,
+ .port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
+};
+
+static int ehci_hcd_ls1x_probe(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd;
+ struct resource *res;
+ int irq;
+ int ret;
+
+ pr_debug("initializing loongson1 ehci USB Controller\n");
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res) {
+ dev_err(&pdev->dev,
+ "Found HC with no IRQ. Check %s setup!\n",
+ dev_name(&pdev->dev));
+ return -ENODEV;
+ }
+ irq = res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev,
+ "Found HC with no register addr. Check %s setup!\n",
+ dev_name(&pdev->dev));
+ return -ENODEV;
+ }
+
+ hcd = usb_create_hcd(&ehci_ls1x_hc_driver, &pdev->dev,
+ dev_name(&pdev->dev));
+ if (!hcd)
+ return -ENOMEM;
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+ dev_dbg(&pdev->dev, "controller already in use\n");
+ ret = -EBUSY;
+ goto err_put_hcd;
+ }
+
+ hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+ if (hcd->regs == NULL) {
+ dev_dbg(&pdev->dev, "error mapping memory\n");
+ ret = -EFAULT;
+ goto err_release_region;
+ }
+
+ ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
+ if (ret)
+ goto err_iounmap;
+
+ return ret;
+
+err_iounmap:
+ iounmap(hcd->regs);
+err_release_region:
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err_put_hcd:
+ usb_put_hcd(hcd);
+ return ret;
+}
+
+static int ehci_hcd_ls1x_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+ usb_remove_hcd(hcd);
+ iounmap(hcd->regs);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ usb_put_hcd(hcd);
+
+ return 0;
+}
+
+static struct platform_driver ehci_ls1x_driver = {
+ .probe = ehci_hcd_ls1x_probe,
+ .remove = ehci_hcd_ls1x_remove,
+ .shutdown = usb_hcd_platform_shutdown,
+ .driver = {
+ .name = "ls1x-ehci",
+ .owner = THIS_MODULE,
+ },
+};
+
+MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ls1x-ehci");
--
1.7.1


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