diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/usb/host/ohci-sa1111.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-sa1111.c b/drivers/usb/host/ohci-sa1111.c new file mode 100644 index 000000000..75c2b28b3 --- /dev/null +++ b/drivers/usb/host/ohci-sa1111.c @@ -0,0 +1,294 @@ +// SPDX-License-Identifier: GPL-1.0+ +/* + * OHCI HCD (Host Controller Driver) for USB. + * + * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> + * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> + * (C) Copyright 2002 Hewlett-Packard Company + * + * SA1111 Bus Glue + * + * Written by Christopher Hoover <ch@hpl.hp.com> + * Based on fragments of previous driver by Russell King et al. + * + * This file is licenced under the GPL. + */ + +#include <asm/mach-types.h> +#include <asm/hardware/sa1111.h> + +#ifndef CONFIG_SA1111 +#error "This file is SA-1111 bus glue. CONFIG_SA1111 must be defined." +#endif + +#define USB_STATUS 0x0118 +#define USB_RESET 0x011c +#define USB_IRQTEST 0x0120 + +#define USB_RESET_FORCEIFRESET (1 << 0) +#define USB_RESET_FORCEHCRESET (1 << 1) +#define USB_RESET_CLKGENRESET (1 << 2) +#define USB_RESET_SIMSCALEDOWN (1 << 3) +#define USB_RESET_USBINTTEST (1 << 4) +#define USB_RESET_SLEEPSTBYEN (1 << 5) +#define USB_RESET_PWRSENSELOW (1 << 6) +#define USB_RESET_PWRCTRLLOW (1 << 7) + +#define USB_STATUS_IRQHCIRMTWKUP (1 << 7) +#define USB_STATUS_IRQHCIBUFFACC (1 << 8) +#define USB_STATUS_NIRQHCIM (1 << 9) +#define USB_STATUS_NHCIMFCLR (1 << 10) +#define USB_STATUS_USBPWRSENSE (1 << 11) + +#if 0 +static void dump_hci_status(struct usb_hcd *hcd, const char *label) +{ + unsigned long status = readl_relaxed(hcd->regs + USB_STATUS); + + printk(KERN_DEBUG "%s USB_STATUS = { %s%s%s%s%s}\n", label, + ((status & USB_STATUS_IRQHCIRMTWKUP) ? "IRQHCIRMTWKUP " : ""), + ((status & USB_STATUS_IRQHCIBUFFACC) ? "IRQHCIBUFFACC " : ""), + ((status & USB_STATUS_NIRQHCIM) ? "" : "IRQHCIM "), + ((status & USB_STATUS_NHCIMFCLR) ? "" : "HCIMFCLR "), + ((status & USB_STATUS_USBPWRSENSE) ? "USBPWRSENSE " : "")); +} +#endif + +static int ohci_sa1111_reset(struct usb_hcd *hcd) +{ + struct ohci_hcd *ohci = hcd_to_ohci(hcd); + + ohci_hcd_init(ohci); + return ohci_init(ohci); +} + +static int ohci_sa1111_start(struct usb_hcd *hcd) +{ + struct ohci_hcd *ohci = hcd_to_ohci(hcd); + int ret; + + ret = ohci_run(ohci); + if (ret < 0) { + ohci_err(ohci, "can't start\n"); + ohci_stop(hcd); + } + return ret; +} + +static const struct hc_driver ohci_sa1111_hc_driver = { + .description = hcd_name, + .product_desc = "SA-1111 OHCI", + .hcd_priv_size = sizeof(struct ohci_hcd), + + /* + * generic hardware linkage + */ + .irq = ohci_irq, + .flags = HCD_USB11 | HCD_DMA | HCD_MEMORY, + + /* + * basic lifecycle operations + */ + .reset = ohci_sa1111_reset, + .start = ohci_sa1111_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, +#ifdef CONFIG_PM + .bus_suspend = ohci_bus_suspend, + .bus_resume = ohci_bus_resume, +#endif + .start_port_reset = ohci_start_port_reset, +}; + +static int sa1111_start_hc(struct sa1111_dev *dev) +{ + unsigned int usb_rst = 0; + int ret; + + dev_dbg(&dev->dev, "starting SA-1111 OHCI USB Controller\n"); + + if (machine_is_xp860() || + machine_is_assabet() || + machine_is_pfs168() || + machine_is_badge4()) + usb_rst = USB_RESET_PWRSENSELOW | USB_RESET_PWRCTRLLOW; + + /* + * Configure the power sense and control lines. Place the USB + * host controller in reset. + */ + writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET, + dev->mapbase + USB_RESET); + + /* + * Now, carefully enable the USB clock, and take + * the USB host controller out of reset. + */ + ret = sa1111_enable_device(dev); + if (ret == 0) { + udelay(11); + writel_relaxed(usb_rst, dev->mapbase + USB_RESET); + } + + return ret; +} + +static void sa1111_stop_hc(struct sa1111_dev *dev) +{ + unsigned int usb_rst; + + dev_dbg(&dev->dev, "stopping SA-1111 OHCI USB Controller\n"); + + /* + * Put the USB host controller into reset. + */ + usb_rst = readl_relaxed(dev->mapbase + USB_RESET); + writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET, + dev->mapbase + USB_RESET); + + /* + * Stop the USB clock. + */ + sa1111_disable_device(dev); +} + +/** + * ohci_hcd_sa1111_probe - initialize SA-1111-based HCDs + * + * Allocates basic resources for this USB host controller, and + * then invokes the start() method for the HCD associated with it. + */ +static int ohci_hcd_sa1111_probe(struct sa1111_dev *dev) +{ + struct usb_hcd *hcd; + int ret, irq; + + if (usb_disabled()) + return -ENODEV; + + /* + * We don't call dma_set_mask_and_coherent() here because the + * DMA mask has already been appropraitely setup by the core + * SA-1111 bus code (which includes bug workarounds.) + */ + + hcd = usb_create_hcd(&ohci_sa1111_hc_driver, &dev->dev, "sa1111"); + if (!hcd) + return -ENOMEM; + + hcd->rsrc_start = dev->res.start; + hcd->rsrc_len = resource_size(&dev->res); + + irq = sa1111_get_irq(dev, 1); + if (irq <= 0) { + ret = irq ? : -ENXIO; + goto err1; + } + + /* + * According to the "Intel StrongARM SA-1111 Microprocessor Companion + * Chip Specification Update" (June 2000), erratum #7, there is a + * significant bug in the SA1111 SDRAM shared memory controller. If + * an access to a region of memory above 1MB relative to the bank base, + * it is important that address bit 10 _NOT_ be asserted. Depending + * on the configuration of the RAM, bit 10 may correspond to one + * of several different (processor-relative) address bits. + * + * Section 4.6 of the "Intel StrongARM SA-1111 Development Module + * User's Guide" mentions that jumpers R51 and R52 control the + * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or + * SDRAM bank 1 on Neponset). The default configuration selects + * Assabet, so any address in bank 1 is necessarily invalid. + * + * As a workaround, use a bounce buffer in addressable memory + * as local_mem, relying on ZONE_DMA to provide an area that + * fits within the above constraints. + * + * SZ_64K is an estimate for what size this might need. + */ + ret = usb_hcd_setup_local_mem(hcd, 0, 0, SZ_64K); + if (ret) + goto err1; + + if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { + dev_dbg(&dev->dev, "request_mem_region failed\n"); + ret = -EBUSY; + goto err1; + } + + hcd->regs = dev->mapbase; + + ret = sa1111_start_hc(dev); + if (ret) + goto err2; + + ret = usb_add_hcd(hcd, irq, 0); + if (ret == 0) { + device_wakeup_enable(hcd->self.controller); + return ret; + } + + sa1111_stop_hc(dev); + err2: + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); + err1: + usb_put_hcd(hcd); + return ret; +} + +/** + * ohci_hcd_sa1111_remove - shutdown processing for SA-1111-based HCDs + * @dev: USB Host Controller being removed + * + * Reverses the effect of ohci_hcd_sa1111_probe(), first invoking + * the HCD's stop() method. + */ +static void ohci_hcd_sa1111_remove(struct sa1111_dev *dev) +{ + struct usb_hcd *hcd = sa1111_get_drvdata(dev); + + usb_remove_hcd(hcd); + sa1111_stop_hc(dev); + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); + usb_put_hcd(hcd); +} + +static void ohci_hcd_sa1111_shutdown(struct device *_dev) +{ + struct sa1111_dev *dev = to_sa1111_device(_dev); + struct usb_hcd *hcd = sa1111_get_drvdata(dev); + + if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) { + hcd->driver->shutdown(hcd); + sa1111_stop_hc(dev); + } +} + +static struct sa1111_driver ohci_hcd_sa1111_driver = { + .drv = { + .name = "sa1111-ohci", + .owner = THIS_MODULE, + .shutdown = ohci_hcd_sa1111_shutdown, + }, + .devid = SA1111_DEVID_USB, + .probe = ohci_hcd_sa1111_probe, + .remove = ohci_hcd_sa1111_remove, +}; |