(please CC, I'm not on the list.)
Hi!
The ep93xx is an arm920t based embedded CPU from Cirrus which has,
amongst other things, an AHB OHCI USB host interface. This CPU isn't
supported in linux yet, but I will be submitting the core ARM support
code for 2.6.17, and in the meanwhile, I would love to get some
feedback on the ep93xx OHCI glue bits that are attached below.
If the patch looks okay, I'll submit a new patch against 2.6.16 (when
that comes out) -- assuming that everything is okay, would it be possible
to get this into 2.6.17?
thanks,
Lennert
--- CUT HERE ---
This patch adds OHCI glue bits for the USB host interface in the
Cirrus ep93xx (arm920t) CPU.
Signed-off-by: Lennert Buytenhek <[EMAIL PROTECTED]>
diff -urN linux-2.6.15.orig/drivers/usb/host/ohci-ep93xx.c
linux-2.6.15/drivers/usb/host/ohci-ep93xx.c
--- linux-2.6.15.orig/drivers/usb/host/ohci-ep93xx.c 1970-01-01
01:00:00.000000000 +0100
+++ linux-2.6.15/drivers/usb/host/ohci-ep93xx.c 2006-02-28 14:44:39.000000000
+0100
@@ -0,0 +1,169 @@
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <[EMAIL PROTECTED]>
+ * (C) Copyright 2000-2002 David Brownell <[EMAIL PROTECTED]>
+ * (C) Copyright 2002 Hewlett-Packard Company
+ *
+ * Bus Glue for ep93xx.
+ *
+ * Written by Christopher Hoover <[EMAIL PROTECTED]>
+ * Based on fragments of previous driver by Russell King et al.
+ *
+ * Modified for LH7A404 from ohci-sa1111.c
+ * by Durgesh Pattamatta <[EMAIL PROTECTED]>
+ *
+ * Modified for pxa27x from ohci-lh7a404.c
+ * by Nick Bane <[EMAIL PROTECTED]> 26-8-2004
+ *
+ * Modified for ep93xx from ohci-pxa27x.c
+ * by Lennert Buytenhek <[EMAIL PROTECTED]> 28-2-2006
+ * Based on an earlier driver by Ray Lehtiniemi
+ *
+ * This file is licenced under the GPL.
+ */
+
+#include <linux/device.h>
+#include <linux/signal.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-types.h>
+#include <asm/hardware.h>
+
+static void ep93xx_start_hc(struct platform_device *dev)
+{
+ unsigned int clock_control;
+
+ clock_control = __raw_readl(EP93XX_SYSCON_CLOCK_CONTROL);
+ clock_control |= EP93XX_SYSCON_CLOCK_USH_EN;
+ __raw_writel(clock_control, EP93XX_SYSCON_CLOCK_CONTROL);
+}
+
+static void ep93xx_stop_hc(struct platform_device *dev)
+{
+ unsigned int clock_control;
+
+ clock_control = __raw_readl(EP93XX_SYSCON_CLOCK_CONTROL);
+ clock_control &= ~EP93XX_SYSCON_CLOCK_USH_EN;
+ __raw_writel(clock_control, EP93XX_SYSCON_CLOCK_CONTROL);
+}
+
+int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
+ struct platform_device *dev)
+{
+ int retval;
+ struct usb_hcd *hcd;
+
+ hcd = usb_create_hcd(driver, &dev->dev, "ep93xx");
+ if (hcd == NULL)
+ return -ENOMEM;
+
+ hcd->rsrc_start = dev->resource[0].start;
+ hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
+ if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
+ usb_put_hcd(hcd);
+ retval = -EBUSY;
+ goto err1;
+ }
+
+ hcd->regs = (void __iomem *)dev->resource[0].start;
+
+ ep93xx_start_hc(dev);
+
+ ohci_hcd_init(hcd_to_ohci(hcd));
+
+ retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT);
+ if (retval == 0)
+ return retval;
+
+ ep93xx_stop_hc(dev);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err1:
+ usb_put_hcd(hcd);
+
+ return retval;
+}
+
+void usb_hcd_ep93xx_remove(struct usb_hcd *hcd, struct platform_device *dev)
+{
+ usb_remove_hcd(hcd);
+ ep93xx_stop_hc(dev);
+ release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+ usb_put_hcd(hcd);
+}
+
+static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ int ret;
+
+ if ((ret = ohci_init(ohci)) < 0)
+ return ret;
+
+ if ((ret = ohci_run(ohci)) < 0) {
+ err("can't start %s", hcd->self.bus_name);
+ ohci_stop(hcd);
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct hc_driver ohci_ep93xx_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "EP93xx OHCI",
+ .hcd_priv_size = sizeof(struct ohci_hcd),
+ .irq = ohci_irq,
+ .flags = HCD_USB11,
+ .start = ohci_ep93xx_start,
+ .stop = ohci_stop,
+ .urb_enqueue = ohci_urb_enqueue,
+ .urb_dequeue = ohci_urb_dequeue,
+ .endpoint_disable = ohci_endpoint_disable,
+ .get_frame_number = ohci_get_frame,
+ .hub_status_data = ohci_hub_status_data,
+ .hub_control = ohci_hub_control,
+};
+
+extern int usb_disabled(void);
+
+static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ ret = -ENODEV;
+ if (!usb_disabled())
+ ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
+
+ return ret;
+}
+
+static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+ usb_hcd_ep93xx_remove(hcd, pdev);
+
+ return 0;
+}
+
+static struct platform_driver ohci_hcd_ep93xx_driver = {
+ .probe = ohci_hcd_ep93xx_drv_probe,
+ .remove = ohci_hcd_ep93xx_drv_remove,
+ .driver = {
+ .name = "ep93xx-ohci",
+ },
+};
+
+static int __init ohci_hcd_ep93xx_init(void)
+{
+ return platform_driver_register(&ohci_hcd_ep93xx_driver);
+}
+
+static void __exit ohci_hcd_ep93xx_cleanup(void)
+{
+ platform_driver_unregister(&ohci_hcd_ep93xx_driver);
+}
+
+module_init(ohci_hcd_ep93xx_init);
+module_exit(ohci_hcd_ep93xx_cleanup);
diff -urN linux-2.6.15.orig/drivers/usb/host/ohci-hcd.c
linux-2.6.15/drivers/usb/host/ohci-hcd.c
--- linux-2.6.15.orig/drivers/usb/host/ohci-hcd.c 2006-02-12
10:22:16.000000000 +0100
+++ linux-2.6.15/drivers/usb/host/ohci-hcd.c 2006-02-28 01:30:21.000000000
+0100
@@ -909,6 +909,10 @@
#include "ohci-pxa27x.c"
#endif
+#ifdef CONFIG_ARCH_EP93XX
+#include "ohci-ep93xx.c"
+#endif
+
#ifdef CONFIG_SOC_AU1X00
#include "ohci-au1xxx.c"
#endif
@@ -923,6 +927,7 @@
|| defined(CONFIG_ARCH_OMAP) \
|| defined (CONFIG_ARCH_LH7A404) \
|| defined (CONFIG_PXA27x) \
+ || defined (CONFIG_ARCH_EP93XX) \
|| defined (CONFIG_SOC_AU1X00) \
|| defined (CONFIG_USB_OHCI_HCD_PPC_SOC) \
)
diff -urN linux-2.6.15.orig/drivers/usb/Kconfig linux-2.6.15/drivers/usb/Kconfig
--- linux-2.6.15.orig/drivers/usb/Kconfig 2006-02-12 10:22:16.000000000
+0100
+++ linux-2.6.15/drivers/usb/Kconfig 2006-02-20 22:56:03.000000000 +0100
@@ -22,6 +22,7 @@
default y if ARCH_LH7A404
default y if ARCH_S3C2410
default y if PXA27x
+ default y if ARCH_EP93XX
# PPC:
default y if STB03xxx
default y if PPC_MPC52xx
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