diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/host/sl811-hcd.c | 1796 |
1 files changed, 1796 insertions, 0 deletions
diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c new file mode 100644 index 000000000..b8b90eec9 --- /dev/null +++ b/drivers/usb/host/sl811-hcd.c @@ -0,0 +1,1796 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SL811HS HCD (Host Controller Driver) for USB. + * + * Copyright (C) 2004 Psion Teklogix (for NetBook PRO) + * Copyright (C) 2004-2005 David Brownell + * + * Periodic scheduling is based on Roman's OHCI code + * Copyright (C) 1999 Roman Weissgaerber + * + * The SL811HS controller handles host side USB (like the SL11H, but with + * another register set and SOF generation) as well as peripheral side USB + * (like the SL811S). This driver version doesn't implement the Gadget API + * for the peripheral role; or OTG (that'd need much external circuitry). + * + * For documentation, see the SL811HS spec and the "SL811HS Embedded Host" + * document (providing significant pieces missing from that spec); plus + * the SL811S spec if you want peripheral side info. + */ + +/* + * Status: Passed basic stress testing, works with hubs, mice, keyboards, + * and usb-storage. + * + * TODO: + * - usb suspend/resume triggered by sl811 + * - various issues noted in the code + * - performance work; use both register banks; ... + * - use urb->iso_frame_desc[] with ISO transfers + */ + +#undef VERBOSE +#undef PACKET_TRACE + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/timer.h> +#include <linux/list.h> +#include <linux/interrupt.h> +#include <linux/usb.h> +#include <linux/usb/sl811.h> +#include <linux/usb/hcd.h> +#include <linux/platform_device.h> +#include <linux/prefetch.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/byteorder.h> +#include <asm/unaligned.h> + +#include "sl811.h" + + +MODULE_DESCRIPTION("SL811HS USB Host Controller Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:sl811-hcd"); + +#define DRIVER_VERSION "19 May 2005" + +/* for now, use only one transfer register bank */ +#undef USE_B + +// #define QUIRK2 +#define QUIRK3 + +static const char hcd_name[] = "sl811-hcd"; + +/*-------------------------------------------------------------------------*/ + +static void port_power(struct sl811 *sl811, int is_on) +{ + struct usb_hcd *hcd = sl811_to_hcd(sl811); + + /* hub is inactive unless the port is powered */ + if (is_on) { + if (sl811->port1 & USB_PORT_STAT_POWER) + return; + + sl811->port1 = USB_PORT_STAT_POWER; + sl811->irq_enable = SL11H_INTMASK_INSRMV; + } else { + sl811->port1 = 0; + sl811->irq_enable = 0; + hcd->state = HC_STATE_HALT; + } + sl811->ctrl1 = 0; + sl811_write(sl811, SL11H_IRQ_ENABLE, 0); + sl811_write(sl811, SL11H_IRQ_STATUS, ~0); + + if (sl811->board && sl811->board->port_power) { + /* switch VBUS, at 500mA unless hub power budget gets set */ + dev_dbg(hcd->self.controller, "power %s\n", + is_on ? "on" : "off"); + sl811->board->port_power(hcd->self.controller, is_on); + } + + /* reset as thoroughly as we can */ + if (sl811->board && sl811->board->reset) + sl811->board->reset(hcd->self.controller); + else { + sl811_write(sl811, SL11H_CTLREG1, SL11H_CTL1MASK_SE0); + mdelay(20); + } + + sl811_write(sl811, SL11H_IRQ_ENABLE, 0); + sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1); + sl811_write(sl811, SL811HS_CTLREG2, SL811HS_CTL2_INIT); + sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable); + + // if !is_on, put into lowpower mode now +} + +/*-------------------------------------------------------------------------*/ + +/* This is a PIO-only HCD. Queueing appends URBs to the endpoint's queue, + * and may start I/O. Endpoint queues are scanned during completion irq + * handlers (one per packet: ACK, NAK, faults, etc) and urb cancellation. + * + * Using an external DMA engine to copy a packet at a time could work, + * though setup/teardown costs may be too big to make it worthwhile. + */ + +/* SETUP starts a new control request. Devices are not allowed to + * STALL or NAK these; they must cancel any pending control requests. + */ +static void setup_packet( + struct sl811 *sl811, + struct sl811h_ep *ep, + struct urb *urb, + u8 bank, + u8 control +) +{ + u8 addr; + u8 len; + void __iomem *data_reg; + + addr = SL811HS_PACKET_BUF(bank == 0); + len = sizeof(struct usb_ctrlrequest); + data_reg = sl811->data_reg; + sl811_write_buf(sl811, addr, urb->setup_packet, len); + + /* autoincrementing */ + sl811_write(sl811, bank + SL11H_BUFADDRREG, addr); + writeb(len, data_reg); + writeb(SL_SETUP /* | ep->epnum */, data_reg); + writeb(usb_pipedevice(urb->pipe), data_reg); + + /* always OUT/data0 */ + sl811_write(sl811, bank + SL11H_HOSTCTLREG, + control | SL11H_HCTLMASK_OUT); + ep->length = 0; + PACKET("SETUP qh%p\n", ep); +} + +/* STATUS finishes control requests, often after IN or OUT data packets */ +static void status_packet( + struct sl811 *sl811, + struct sl811h_ep *ep, + struct urb *urb, + u8 bank, + u8 control +) +{ + int do_out; + void __iomem *data_reg; + + do_out = urb->transfer_buffer_length && usb_pipein(urb->pipe); + data_reg = sl811->data_reg; + + /* autoincrementing */ + sl811_write(sl811, bank + SL11H_BUFADDRREG, 0); + writeb(0, data_reg); + writeb((do_out ? SL_OUT : SL_IN) /* | ep->epnum */, data_reg); + writeb(usb_pipedevice(urb->pipe), data_reg); + + /* always data1; sometimes IN */ + control |= SL11H_HCTLMASK_TOGGLE; + if (do_out) + control |= SL11H_HCTLMASK_OUT; + sl811_write(sl811, bank + SL11H_HOSTCTLREG, control); + ep->length = 0; + PACKET("STATUS%s/%s qh%p\n", ep->nak_count ? "/retry" : "", + do_out ? "out" : "in", ep); +} + +/* IN packets can be used with any type of endpoint. here we just + * start the transfer, data from the peripheral may arrive later. + * urb->iso_frame_desc is currently ignored here... + */ +static void in_packet( + struct sl811 *sl811, + struct sl811h_ep *ep, + struct urb *urb, + u8 bank, + u8 control +) +{ + u8 addr; + u8 len; + void __iomem *data_reg; + + /* avoid losing data on overflow */ + len = ep->maxpacket; + addr = SL811HS_PACKET_BUF(bank == 0); + if (!(control & SL11H_HCTLMASK_ISOCH) + && usb_gettoggle(urb->dev, ep->epnum, 0)) + control |= SL11H_HCTLMASK_TOGGLE; + data_reg = sl811->data_reg; + + /* autoincrementing */ + sl811_write(sl811, bank + SL11H_BUFADDRREG, addr); + writeb(len, data_reg); + writeb(SL_IN | ep->epnum, data_reg); + writeb(usb_pipedevice(urb->pipe), data_reg); + + sl811_write(sl811, bank + SL11H_HOSTCTLREG, control); + ep->length = min_t(u32, len, + urb->transfer_buffer_length - urb->actual_length); + PACKET("IN%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "", + !!usb_gettoggle(urb->dev, ep->epnum, 0), ep, len); +} + +/* OUT packets can be used with any type of endpoint. + * urb->iso_frame_desc is currently ignored here... + */ +static void out_packet( + struct sl811 *sl811, + struct sl811h_ep *ep, + struct urb *urb, + u8 bank, + u8 control +) +{ + void *buf; + u8 addr; + u8 len; + void __iomem *data_reg; + + buf = urb->transfer_buffer + urb->actual_length; + prefetch(buf); + + len = min_t(u32, ep->maxpacket, + urb->transfer_buffer_length - urb->actual_length); + + if (!(control & SL11H_HCTLMASK_ISOCH) + && usb_gettoggle(urb->dev, ep->epnum, 1)) + control |= SL11H_HCTLMASK_TOGGLE; + addr = SL811HS_PACKET_BUF(bank == 0); + data_reg = sl811->data_reg; + + sl811_write_buf(sl811, addr, buf, len); + + /* autoincrementing */ + sl811_write(sl811, bank + SL11H_BUFADDRREG, addr); + writeb(len, data_reg); + writeb(SL_OUT | ep->epnum, data_reg); + writeb(usb_pipedevice(urb->pipe), data_reg); + + sl811_write(sl811, bank + SL11H_HOSTCTLREG, + control | SL11H_HCTLMASK_OUT); + ep->length = len; + PACKET("OUT%s/%d qh%p len%d\n", ep->nak_count ? "/retry" : "", + !!usb_gettoggle(urb->dev, ep->epnum, 1), ep, len); +} + +/*-------------------------------------------------------------------------*/ + +/* caller updates on-chip enables later */ + +static inline void sofirq_on(struct sl811 *sl811) +{ + if (sl811->irq_enable & SL11H_INTMASK_SOFINTR) + return; + dev_dbg(sl811_to_hcd(sl811)->self.controller, "sof irq on\n"); + sl811->irq_enable |= SL11H_INTMASK_SOFINTR; +} + +static inline void sofirq_off(struct sl811 *sl811) +{ + if (!(sl811->irq_enable & SL11H_INTMASK_SOFINTR)) + return; + dev_dbg(sl811_to_hcd(sl811)->self.controller, "sof irq off\n"); + sl811->irq_enable &= ~SL11H_INTMASK_SOFINTR; +} + +/*-------------------------------------------------------------------------*/ + +/* pick the next endpoint for a transaction, and issue it. + * frames start with periodic transfers (after whatever is pending + * from the previous frame), and the rest of the time is async + * transfers, scheduled round-robin. + */ +static struct sl811h_ep *start(struct sl811 *sl811, u8 bank) +{ + struct sl811h_ep *ep; + struct urb *urb; + int fclock; + u8 control; + + /* use endpoint at schedule head */ + if (sl811->next_periodic) { + ep = sl811->next_periodic; + sl811->next_periodic = ep->next; + } else { + if (sl811->next_async) + ep = sl811->next_async; + else if (!list_empty(&sl811->async)) + ep = container_of(sl811->async.next, + struct sl811h_ep, schedule); + else { + /* could set up the first fullspeed periodic + * transfer for the next frame ... + */ + return NULL; + } + +#ifdef USE_B + if ((bank && sl811->active_b == ep) || sl811->active_a == ep) + return NULL; +#endif + + if (ep->schedule.next == &sl811->async) + sl811->next_async = NULL; + else + sl811->next_async = container_of(ep->schedule.next, + struct sl811h_ep, schedule); + } + + if (unlikely(list_empty(&ep->hep->urb_list))) { + dev_dbg(sl811_to_hcd(sl811)->self.controller, + "empty %p queue?\n", ep); + return NULL; + } + + urb = container_of(ep->hep->urb_list.next, struct urb, urb_list); + control = ep->defctrl; + + /* if this frame doesn't have enough time left to transfer this + * packet, wait till the next frame. too-simple algorithm... + */ + fclock = sl811_read(sl811, SL11H_SOFTMRREG) << 6; + fclock -= 100; /* setup takes not much time */ + if (urb->dev->speed == USB_SPEED_LOW) { + if (control & SL11H_HCTLMASK_PREAMBLE) { + /* also note erratum 1: some hubs won't work */ + fclock -= 800; + } + fclock -= ep->maxpacket << 8; + + /* erratum 2: AFTERSOF only works for fullspeed */ + if (fclock < 0) { + if (ep->period) + sl811->stat_overrun++; + sofirq_on(sl811); + return NULL; + } + } else { + fclock -= 12000 / 19; /* 19 64byte packets/msec */ + if (fclock < 0) { + if (ep->period) + sl811->stat_overrun++; + control |= SL11H_HCTLMASK_AFTERSOF; + + /* throttle bulk/control irq noise */ + } else if (ep->nak_count) + control |= SL11H_HCTLMASK_AFTERSOF; + } + + + switch (ep->nextpid) { + case USB_PID_IN: + in_packet(sl811, ep, urb, bank, control); + break; + case USB_PID_OUT: + out_packet(sl811, ep, urb, bank, control); + break; + case USB_PID_SETUP: + setup_packet(sl811, ep, urb, bank, control); + break; + case USB_PID_ACK: /* for control status */ + status_packet(sl811, ep, urb, bank, control); + break; + default: + dev_dbg(sl811_to_hcd(sl811)->self.controller, + "bad ep%p pid %02x\n", ep, ep->nextpid); + ep = NULL; + } + return ep; +} + +#define MIN_JIFFIES ((msecs_to_jiffies(2) > 1) ? msecs_to_jiffies(2) : 2) + +static inline void start_transfer(struct sl811 *sl811) +{ + if (sl811->port1 & USB_PORT_STAT_SUSPEND) + return; + if (sl811->active_a == NULL) { + sl811->active_a = start(sl811, SL811_EP_A(SL811_HOST_BUF)); + if (sl811->active_a != NULL) + sl811->jiffies_a = jiffies + MIN_JIFFIES; + } +#ifdef USE_B + if (sl811->active_b == NULL) { + sl811->active_b = start(sl811, SL811_EP_B(SL811_HOST_BUF)); + if (sl811->active_b != NULL) + sl811->jiffies_b = jiffies + MIN_JIFFIES; + } +#endif +} + +static void finish_request( + struct sl811 *sl811, + struct sl811h_ep *ep, + struct urb *urb, + int status +) __releases(sl811->lock) __acquires(sl811->lock) +{ + unsigned i; + + if (usb_pipecontrol(urb->pipe)) + ep->nextpid = USB_PID_SETUP; + + usb_hcd_unlink_urb_from_ep(sl811_to_hcd(sl811), urb); + spin_unlock(&sl811->lock); + usb_hcd_giveback_urb(sl811_to_hcd(sl811), urb, status); + spin_lock(&sl811->lock); + + /* leave active endpoints in the schedule */ + if (!list_empty(&ep->hep->urb_list)) + return; + + /* async deschedule? */ + if (!list_empty(&ep->schedule)) { + list_del_init(&ep->schedule); + if (ep == sl811->next_async) + sl811->next_async = NULL; + return; + } + + /* periodic deschedule */ + dev_dbg(sl811_to_hcd(sl811)->self.controller, + "deschedule qh%d/%p branch %d\n", ep->period, ep, ep->branch); + for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) { + struct sl811h_ep *temp; + struct sl811h_ep **prev = &sl811->periodic[i]; + + while (*prev && ((temp = *prev) != ep)) + prev = &temp->next; + if (*prev) + *prev = ep->next; + sl811->load[i] -= ep->load; + } + ep->branch = PERIODIC_SIZE; + sl811->periodic_count--; + sl811_to_hcd(sl811)->self.bandwidth_allocated + -= ep->load / ep->period; + if (ep == sl811->next_periodic) + sl811->next_periodic = ep->next; + + /* we might turn SOFs back on again for the async schedule */ + if (sl811->periodic_count == 0) + sofirq_off(sl811); +} + +static void +done(struct sl811 *sl811, struct sl811h_ep *ep, u8 bank) +{ + u8 status; + struct urb *urb; + int urbstat = -EINPROGRESS; + + if (unlikely(!ep)) + return; + + status = sl811_read(sl811, bank + SL11H_PKTSTATREG); + + urb = container_of(ep->hep->urb_list.next, struct urb, urb_list); + + /* we can safely ignore NAKs */ + if (status & SL11H_STATMASK_NAK) { + // PACKET("...NAK_%02x qh%p\n", bank, ep); + if (!ep->period) + ep->nak_count++; + ep->error_count = 0; + + /* ACK advances transfer, toggle, and maybe queue */ + } else if (status & SL11H_STATMASK_ACK) { + struct usb_device *udev = urb->dev; + int len; + unsigned char *buf; + + /* urb->iso_frame_desc is currently ignored here... */ + + ep->nak_count = ep->error_count = 0; + switch (ep->nextpid) { + case USB_PID_OUT: + // PACKET("...ACK/out_%02x qh%p\n", bank, ep); + urb->actual_length += ep->length; + usb_dotoggle(udev, ep->epnum, 1); + if (urb->actual_length + == urb->transfer_buffer_length) { + if (usb_pipecontrol(urb->pipe)) + ep->nextpid = USB_PID_ACK; + + /* some bulk protocols terminate OUT transfers + * by a short packet, using ZLPs not padding. + */ + else if (ep->length < ep->maxpacket + || !(urb->transfer_flags + & URB_ZERO_PACKET)) + urbstat = 0; + } + break; + case USB_PID_IN: + // PACKET("...ACK/in_%02x qh%p\n", bank, ep); + buf = urb->transfer_buffer + urb->actual_length; + prefetchw(buf); + len = ep->maxpacket - sl811_read(sl811, + bank + SL11H_XFERCNTREG); + if (len > ep->length) { + len = ep->length; + urbstat = -EOVERFLOW; + } + urb->actual_length += len; + sl811_read_buf(sl811, SL811HS_PACKET_BUF(bank == 0), + buf, len); + usb_dotoggle(udev, ep->epnum, 0); + if (urbstat == -EINPROGRESS && + (len < ep->maxpacket || + urb->actual_length == + urb->transfer_buffer_length)) { + if (usb_pipecontrol(urb->pipe)) + ep->nextpid = USB_PID_ACK; + else + urbstat = 0; + } + break; + case USB_PID_SETUP: + // PACKET("...ACK/setup_%02x qh%p\n", bank, ep); + if (urb->transfer_buffer_length == urb->actual_length) + ep->nextpid = USB_PID_ACK; + else if (usb_pipeout(urb->pipe)) { + usb_settoggle(udev, 0, 1, 1); + ep->nextpid = USB_PID_OUT; + } else { + usb_settoggle(udev, 0, 0, 1); + ep->nextpid = USB_PID_IN; + } + break; + case USB_PID_ACK: + // PACKET("...ACK/status_%02x qh%p\n", bank, ep); + urbstat = 0; + break; + } + + /* STALL stops all transfers */ + } else if (status & SL11H_STATMASK_STALL) { + PACKET("...STALL_%02x qh%p\n", bank, ep); + ep->nak_count = ep->error_count = 0; + urbstat = -EPIPE; + + /* error? retry, until "3 strikes" */ + } else if (++ep->error_count >= 3) { + if (status & SL11H_STATMASK_TMOUT) + urbstat = -ETIME; + else if (status & SL11H_STATMASK_OVF) + urbstat = -EOVERFLOW; + else + urbstat = -EPROTO; + ep->error_count = 0; + PACKET("...3STRIKES_%02x %02x qh%p stat %d\n", + bank, status, ep, urbstat); + } + + if (urbstat != -EINPROGRESS || urb->unlinked) + finish_request(sl811, ep, urb, urbstat); +} + +static inline u8 checkdone(struct sl811 *sl811) +{ + u8 ctl; + u8 irqstat = 0; + + if (sl811->active_a && time_before_eq(sl811->jiffies_a, jiffies)) { + ctl = sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)); + if (ctl & SL11H_HCTLMASK_ARM) + sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0); + dev_dbg(sl811_to_hcd(sl811)->self.controller, + "%s DONE_A: ctrl %02x sts %02x\n", + (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost", + ctl, + sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG))); + irqstat |= SL11H_INTMASK_DONE_A; + } +#ifdef USE_B + if (sl811->active_b && time_before_eq(sl811->jiffies_b, jiffies)) { + ctl = sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)); + if (ctl & SL11H_HCTLMASK_ARM) + sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0); + dev_dbg(sl811_to_hcd(sl811)->self.controller, + "%s DONE_B: ctrl %02x sts %02x\n", + (ctl & SL11H_HCTLMASK_ARM) ? "timeout" : "lost", + ctl, + sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG))); + irqstat |= SL11H_INTMASK_DONE_A; + } +#endif + return irqstat; +} + +static irqreturn_t sl811h_irq(struct usb_hcd *hcd) +{ + struct sl811 *sl811 = hcd_to_sl811(hcd); + u8 irqstat; + irqreturn_t ret = IRQ_NONE; + unsigned retries = 5; + + spin_lock(&sl811->lock); + +retry: + irqstat = sl811_read(sl811, SL11H_IRQ_STATUS) & ~SL11H_INTMASK_DP; + if (irqstat) { + sl811_write(sl811, SL11H_IRQ_STATUS, irqstat); + irqstat &= sl811->irq_enable; + } + +#ifdef QUIRK2 + /* this may no longer be necessary ... */ + if (irqstat == 0) { + irqstat = checkdone(sl811); + if (irqstat) + sl811->stat_lost++; + } +#endif + + /* USB packets, not necessarily handled in the order they're + * issued ... that's fine if they're different endpoints. + */ + if (irqstat & SL11H_INTMASK_DONE_A) { + done(sl811, sl811->active_a, SL811_EP_A(SL811_HOST_BUF)); + sl811->active_a = NULL; + sl811->stat_a++; + } +#ifdef USE_B + if (irqstat & SL11H_INTMASK_DONE_B) { + done(sl811, sl811->active_b, SL811_EP_B(SL811_HOST_BUF)); + sl811->active_b = NULL; + sl811->stat_b++; + } +#endif + if (irqstat & SL11H_INTMASK_SOFINTR) { + unsigned index; + + index = sl811->frame++ % (PERIODIC_SIZE - 1); + sl811->stat_sof++; + + /* be graceful about almost-inevitable periodic schedule + * overruns: continue the previous frame's transfers iff + * this one has nothing scheduled. + */ + if (sl811->next_periodic) { + // dev_err(hcd->self.controller, "overrun to slot %d\n", index); + sl811->stat_overrun++; + } + if (sl811->periodic[index]) + sl811->next_periodic = sl811->periodic[index]; + } + + /* hub_wq manages debouncing and wakeup */ + if (irqstat & SL11H_INTMASK_INSRMV) { + sl811->stat_insrmv++; + + /* most stats are reset for each VBUS session */ + sl811->stat_wake = 0; + sl811->stat_sof = 0; + sl811->stat_a = 0; + sl811->stat_b = 0; + sl811->stat_lost = 0; + + sl811->ctrl1 = 0; + sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1); + + sl811->irq_enable = SL11H_INTMASK_INSRMV; + sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable); + + /* usbcore nukes other pending transactions on disconnect */ + if (sl811->active_a) { + sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), 0); + finish_request(sl811, sl811->active_a, + container_of(sl811->active_a + ->hep->urb_list.next, + struct urb, urb_list), + -ESHUTDOWN); + sl811->active_a = NULL; + } +#ifdef USE_B + if (sl811->active_b) { + sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), 0); + finish_request(sl811, sl811->active_b, + container_of(sl811->active_b + ->hep->urb_list.next, + struct urb, urb_list), + NULL, -ESHUTDOWN); + sl811->active_b = NULL; + } +#endif + + /* port status seems weird until after reset, so + * force the reset and make hub_wq clean up later. + */ + if (irqstat & SL11H_INTMASK_RD) + sl811->port1 &= ~USB_PORT_STAT_CONNECTION; + else + sl811->port1 |= USB_PORT_STAT_CONNECTION; + + sl811->port1 |= USB_PORT_STAT_C_CONNECTION << 16; + + } else if (irqstat & SL11H_INTMASK_RD) { + if (sl811->port1 & USB_PORT_STAT_SUSPEND) { + dev_dbg(hcd->self.controller, "wakeup\n"); + sl811->port1 |= USB_PORT_STAT_C_SUSPEND << 16; + sl811->stat_wake++; + } else + irqstat &= ~SL11H_INTMASK_RD; + } + + if (irqstat) { + if (sl811->port1 & USB_PORT_STAT_ENABLE) + start_transfer(sl811); + ret = IRQ_HANDLED; + if (retries--) + goto retry; + } + + if (sl811->periodic_count == 0 && list_empty(&sl811->async)) + sofirq_off(sl811); + sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable); + + spin_unlock(&sl811->lock); + + return ret; +} + +/*-------------------------------------------------------------------------*/ + +/* usb 1.1 says max 90% of a frame is available for periodic transfers. + * this driver doesn't promise that much since it's got to handle an + * IRQ per packet; irq handling latencies also use up that time. + * + * NOTE: the periodic schedule is a sparse tree, with the load for + * each branch minimized. see fig 3.5 in the OHCI spec for example. + */ +#define MAX_PERIODIC_LOAD 500 /* out of 1000 usec */ + +static int balance(struct sl811 *sl811, u16 period, u16 load) +{ + int i, branch = -ENOSPC; + + /* search for the least loaded schedule branch of that period + * which has enough bandwidth left unreserved. + */ + for (i = 0; i < period ; i++) { + if (branch < 0 || sl811->load[branch] > sl811->load[i]) { + int j; + + for (j = i; j < PERIODIC_SIZE; j += period) { + if ((sl811->load[j] + load) + > MAX_PERIODIC_LOAD) + break; + } + if (j < PERIODIC_SIZE) + continue; + branch = i; + } + } + return branch; +} + +/*-------------------------------------------------------------------------*/ + +static int sl811h_urb_enqueue( + struct usb_hcd *hcd, + struct urb *urb, + gfp_t mem_flags +) { + struct sl811 *sl811 = hcd_to_sl811(hcd); + struct usb_device *udev = urb->dev; + unsigned int pipe = urb->pipe; + int is_out = !usb_pipein(pipe); + int type = usb_pipetype(pipe); + int epnum = usb_pipeendpoint(pipe); + struct sl811h_ep *ep = NULL; + unsigned long flags; + int i; + int retval; + struct usb_host_endpoint *hep = urb->ep; + +#ifndef CONFIG_USB_SL811_HCD_ISO + if (type == PIPE_ISOCHRONOUS) + return -ENOSPC; +#endif + + /* avoid all allocations within spinlocks */ + if (!hep->hcpriv) { + ep = kzalloc(sizeof *ep, mem_flags); + if (ep == NULL) + return -ENOMEM; + } + + spin_lock_irqsave(&sl811->lock, flags); + + /* don't submit to a dead or disabled port */ + if (!(sl811->port1 & USB_PORT_STAT_ENABLE) + || !HC_IS_RUNNING(hcd->state)) { + retval = -ENODEV; + kfree(ep); + goto fail_not_linked; + } + retval = usb_hcd_link_urb_to_ep(hcd, urb); + if (retval) { + kfree(ep); + goto fail_not_linked; + } + + if (hep->hcpriv) { + kfree(ep); + ep = hep->hcpriv; + } else if (!ep) { + retval = -ENOMEM; + goto fail; + + } else { + INIT_LIST_HEAD(&ep->schedule); + ep->udev = udev; + ep->epnum = epnum; + ep->maxpacket = usb_maxpacket(udev, urb->pipe); + ep->defctrl = SL11H_HCTLMASK_ARM | SL11H_HCTLMASK_ENABLE; + usb_settoggle(udev, epnum, is_out, 0); + + if (type == PIPE_CONTROL) + ep->nextpid = USB_PID_SETUP; + else if (is_out) + ep->nextpid = USB_PID_OUT; + else + ep->nextpid = USB_PID_IN; + + if (ep->maxpacket > H_MAXPACKET) { + /* iso packets up to 240 bytes could work... */ + dev_dbg(hcd->self.controller, + "dev %d ep%d maxpacket %d\n", udev->devnum, + epnum, ep->maxpacket); + retval = -EINVAL; + kfree(ep); + goto fail; + } + + if (udev->speed == USB_SPEED_LOW) { + /* send preamble for external hub? */ + if (!(sl811->ctrl1 & SL11H_CTL1MASK_LSPD)) + ep->defctrl |= SL11H_HCTLMASK_PREAMBLE; + } + switch (type) { + case PIPE_ISOCHRONOUS: + case PIPE_INTERRUPT: + if (urb->interval > PERIODIC_SIZE) + urb->interval = PERIODIC_SIZE; + ep->period = urb->interval; + ep->branch = PERIODIC_SIZE; + if (type == PIPE_ISOCHRONOUS) + ep->defctrl |= SL11H_HCTLMASK_ISOCH; + ep->load = usb_calc_bus_time(udev->speed, !is_out, + type == PIPE_ISOCHRONOUS, + usb_maxpacket(udev, pipe)) + / 1000; + break; + } + + ep->hep = hep; + hep->hcpriv = ep; + } + + /* maybe put endpoint into schedule */ + switch (type) { + case PIPE_CONTROL: + case PIPE_BULK: + if (list_empty(&ep->schedule)) + list_add_tail(&ep->schedule, &sl811->async); + break; + case PIPE_ISOCHRONOUS: + case PIPE_INTERRUPT: + urb->interval = ep->period; + if (ep->branch < PERIODIC_SIZE) { + /* NOTE: the phase is correct here, but the value + * needs offsetting by the transfer queue depth. + * All current drivers ignore start_frame, so this + * is unlikely to ever matter... + */ + urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1)) + + ep->branch; + break; + } + + retval = balance(sl811, ep->period, ep->load); + if (retval < 0) + goto fail; + ep->branch = retval; + retval = 0; + urb->start_frame = (sl811->frame & (PERIODIC_SIZE - 1)) + + ep->branch; + + /* sort each schedule branch by period (slow before fast) + * to share the faster parts of the tree without needing + * dummy/placeholder nodes + */ + dev_dbg(hcd->self.controller, "schedule qh%d/%p branch %d\n", + ep->period, ep, ep->branch); + for (i = ep->branch; i < PERIODIC_SIZE; i += ep->period) { + struct sl811h_ep **prev = &sl811->periodic[i]; + struct sl811h_ep *here = *prev; + + while (here && ep != here) { + if (ep->period > here->period) + break; + prev = &here->next; + here = *prev; + } + if (ep != here) { + ep->next = here; + *prev = ep; + } + sl811->load[i] += ep->load; + } + sl811->periodic_count++; + hcd->self.bandwidth_allocated += ep->load / ep->period; + sofirq_on(sl811); + } + + urb->hcpriv = hep; + start_transfer(sl811); + sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable); +fail: + if (retval) + usb_hcd_unlink_urb_from_ep(hcd, urb); +fail_not_linked: + spin_unlock_irqrestore(&sl811->lock, flags); + return retval; +} + +static int sl811h_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) +{ + struct sl811 *sl811 = hcd_to_sl811(hcd); + struct usb_host_endpoint *hep; + unsigned long flags; + struct sl811h_ep *ep; + int retval; + + spin_lock_irqsave(&sl811->lock, flags); + retval = usb_hcd_check_unlink_urb(hcd, urb, status); + if (retval) + goto fail; + + hep = urb->hcpriv; + ep = hep->hcpriv; + if (ep) { + /* finish right away if this urb can't be active ... + * note that some drivers wrongly expect delays + */ + if (ep->hep->urb_list.next != &urb->urb_list) { + /* not front of queue? never active */ + + /* for active transfers, we expect an IRQ */ + } else if (sl811->active_a == ep) { + if (time_before_eq(sl811->jiffies_a, jiffies)) { + /* happens a lot with lowspeed?? */ + dev_dbg(hcd->self.controller, + "giveup on DONE_A: ctrl %02x sts %02x\n", + sl811_read(sl811, + SL811_EP_A(SL11H_HOSTCTLREG)), + sl811_read(sl811, + SL811_EP_A(SL11H_PKTSTATREG))); + sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), + 0); + sl811->active_a = NULL; + } else + urb = NULL; +#ifdef USE_B + } else if (sl811->active_b == ep) { + if (time_before_eq(sl811->jiffies_a, jiffies)) { + /* happens a lot with lowspeed?? */ + dev_dbg(hcd->self.controller, + "giveup on DONE_B: ctrl %02x sts %02x\n", + sl811_read(sl811, + SL811_EP_B(SL11H_HOSTCTLREG)), + sl811_read(sl811, + SL811_EP_B(SL11H_PKTSTATREG))); + sl811_write(sl811, SL811_EP_B(SL11H_HOSTCTLREG), + 0); + sl811->active_b = NULL; + } else + urb = NULL; +#endif + } else { + /* front of queue for inactive endpoint */ + } + + if (urb) + finish_request(sl811, ep, urb, 0); + else + dev_dbg(sl811_to_hcd(sl811)->self.controller, + "dequeue, urb %p active %s; wait4irq\n", urb, + (sl811->active_a == ep) ? "A" : "B"); + } else + retval = -EINVAL; + fail: + spin_unlock_irqrestore(&sl811->lock, flags); + return retval; +} + +static void +sl811h_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep) +{ + struct sl811h_ep *ep = hep->hcpriv; + + if (!ep) + return; + + /* assume we'd just wait for the irq */ + if (!list_empty(&hep->urb_list)) + msleep(3); + if (!list_empty(&hep->urb_list)) + dev_warn(hcd->self.controller, "ep %p not empty?\n", ep); + + kfree(ep); + hep->hcpriv = NULL; +} + +static int +sl811h_get_frame(struct usb_hcd *hcd) +{ + struct sl811 *sl811 = hcd_to_sl811(hcd); + + /* wrong except while periodic transfers are scheduled; + * never matches the on-the-wire frame; + * subject to overruns. + */ + return sl811->frame; +} + + +/*-------------------------------------------------------------------------*/ + +/* the virtual root hub timer IRQ checks for hub status */ +static int +sl811h_hub_status_data(struct usb_hcd *hcd, char *buf) +{ + struct sl811 *sl811 = hcd_to_sl811(hcd); +#ifdef QUIRK3 + unsigned long flags; + + /* non-SMP HACK: use root hub timer as i/o watchdog + * this seems essential when SOF IRQs aren't in use... + */ + local_irq_save(flags); + if (!timer_pending(&sl811->timer)) { + if (sl811h_irq( /* ~0, */ hcd) != IRQ_NONE) + sl811->stat_lost++; + } + local_irq_restore(flags); +#endif + + if (!(sl811->port1 & (0xffff << 16))) + return 0; + + /* tell hub_wq port 1 changed */ + *buf = (1 << 1); + return 1; +} + +static void +sl811h_hub_descriptor ( + struct sl811 *sl811, + struct usb_hub_descriptor *desc +) { + u16 temp = 0; + + desc->bDescriptorType = USB_DT_HUB; + desc->bHubContrCurrent = 0; + + desc->bNbrPorts = 1; + desc->bDescLength = 9; + + /* per-port power switching (gang of one!), or none */ + desc->bPwrOn2PwrGood = 0; + if (sl811->board && sl811->board->port_power) { + desc->bPwrOn2PwrGood = sl811->board->potpg; + if (!desc->bPwrOn2PwrGood) + desc->bPwrOn2PwrGood = 10; + temp = HUB_CHAR_INDV_PORT_LPSM; + } else + temp = HUB_CHAR_NO_LPSM; + + /* no overcurrent errors detection/handling */ + temp |= HUB_CHAR_NO_OCPM; + + desc->wHubCharacteristics = cpu_to_le16(temp); + + /* ports removable, and legacy PortPwrCtrlMask */ + desc->u.hs.DeviceRemovable[0] = 0 << 1; + desc->u.hs.DeviceRemovable[1] = ~0; +} + +static void +sl811h_timer(struct timer_list *t) +{ + struct sl811 *sl811 = from_timer(sl811, t, timer); + unsigned long flags; + u8 irqstat; + u8 signaling = sl811->ctrl1 & SL11H_CTL1MASK_FORCE; + const u32 mask = USB_PORT_STAT_CONNECTION + | USB_PORT_STAT_ENABLE + | USB_PORT_STAT_LOW_SPEED; + + spin_lock_irqsave(&sl811->lock, flags); + + /* stop special signaling */ + sl811->ctrl1 &= ~SL11H_CTL1MASK_FORCE; + sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1); + udelay(3); + + irqstat = sl811_read(sl811, SL11H_IRQ_STATUS); + + switch (signaling) { + case SL11H_CTL1MASK_SE0: + dev_dbg(sl811_to_hcd(sl811)->self.controller, "end reset\n"); + sl811->port1 = (USB_PORT_STAT_C_RESET << 16) + | USB_PORT_STAT_POWER; + sl811->ctrl1 = 0; + /* don't wrongly ack RD */ + if (irqstat & SL11H_INTMASK_INSRMV) + irqstat &= ~SL11H_INTMASK_RD; + break; + case SL11H_CTL1MASK_K: + dev_dbg(sl811_to_hcd(sl811)->self.controller, "end resume\n"); + sl811->port1 &= ~USB_PORT_STAT_SUSPEND; + break; + default: + dev_dbg(sl811_to_hcd(sl811)->self.controller, + "odd timer signaling: %02x\n", signaling); + break; + } + sl811_write(sl811, SL11H_IRQ_STATUS, irqstat); + + if (irqstat & SL11H_INTMASK_RD) { + /* usbcore nukes all pending transactions on disconnect */ + if (sl811->port1 & USB_PORT_STAT_CONNECTION) + sl811->port1 |= (USB_PORT_STAT_C_CONNECTION << 16) + | (USB_PORT_STAT_C_ENABLE << 16); + sl811->port1 &= ~mask; + sl811->irq_enable = SL11H_INTMASK_INSRMV; + } else { + sl811->port1 |= mask; + if (irqstat & SL11H_INTMASK_DP) + sl811->port1 &= ~USB_PORT_STAT_LOW_SPEED; + sl811->irq_enable = SL11H_INTMASK_INSRMV | SL11H_INTMASK_RD; + } + + if (sl811->port1 & USB_PORT_STAT_CONNECTION) { + u8 ctrl2 = SL811HS_CTL2_INIT; + + sl811->irq_enable |= SL11H_INTMASK_DONE_A; +#ifdef USE_B + sl811->irq_enable |= SL11H_INTMASK_DONE_B; +#endif + if (sl811->port1 & USB_PORT_STAT_LOW_SPEED) { + sl811->ctrl1 |= SL11H_CTL1MASK_LSPD; + ctrl2 |= SL811HS_CTL2MASK_DSWAP; + } + + /* start SOFs flowing, kickstarting with A registers */ + sl811->ctrl1 |= SL11H_CTL1MASK_SOF_ENA; + sl811_write(sl811, SL11H_SOFLOWREG, 0xe0); + sl811_write(sl811, SL811HS_CTLREG2, ctrl2); + + /* autoincrementing */ + sl811_write(sl811, SL811_EP_A(SL11H_BUFLNTHREG), 0); + writeb(SL_SOF, sl811->data_reg); + writeb(0, sl811->data_reg); + sl811_write(sl811, SL811_EP_A(SL11H_HOSTCTLREG), + SL11H_HCTLMASK_ARM); + + /* hub_wq provides debounce delay */ + } else { + sl811->ctrl1 = 0; + } + sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1); + + /* reenable irqs */ + sl811_write(sl811, SL11H_IRQ_ENABLE, sl811->irq_enable); + spin_unlock_irqrestore(&sl811->lock, flags); +} + +static int +sl811h_hub_control( + struct usb_hcd *hcd, + u16 typeReq, + u16 wValue, + u16 wIndex, + char *buf, + u16 wLength +) { + struct sl811 *sl811 = hcd_to_sl811(hcd); + int retval = 0; + unsigned long flags; + + spin_lock_irqsave(&sl811->lock, flags); + + switch (typeReq) { + case ClearHubFeature: + case SetHubFeature: + switch (wValue) { + case C_HUB_OVER_CURRENT: + case C_HUB_LOCAL_POWER: + break; + default: + goto error; + } + break; + case ClearPortFeature: + if (wIndex != 1 || wLength != 0) + goto error; + + switch (wValue) { + case USB_PORT_FEAT_ENABLE: + sl811->port1 &= USB_PORT_STAT_POWER; + sl811->ctrl1 = 0; + sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1); + sl811->irq_enable = SL11H_INTMASK_INSRMV; + sl811_write(sl811, SL11H_IRQ_ENABLE, + sl811->irq_enable); + break; + case USB_PORT_FEAT_SUSPEND: + if (!(sl811->port1 & USB_PORT_STAT_SUSPEND)) + break; + + /* 20 msec of resume/K signaling, other irqs blocked */ + dev_dbg(hcd->self.controller, "start resume...\n"); + sl811->irq_enable = 0; + sl811_write(sl811, SL11H_IRQ_ENABLE, + sl811->irq_enable); + sl811->ctrl1 |= SL11H_CTL1MASK_K; + sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1); + + mod_timer(&sl811->timer, jiffies + + msecs_to_jiffies(USB_RESUME_TIMEOUT)); + break; + case USB_PORT_FEAT_POWER: + port_power(sl811, 0); + break; + case USB_PORT_FEAT_C_ENABLE: + case USB_PORT_FEAT_C_SUSPEND: + case USB_PORT_FEAT_C_CONNECTION: + case USB_PORT_FEAT_C_OVER_CURRENT: + case USB_PORT_FEAT_C_RESET: + break; + default: + goto error; + } + sl811->port1 &= ~(1 << wValue); + break; + case GetHubDescriptor: + sl811h_hub_descriptor(sl811, (struct usb_hub_descriptor *) buf); + break; + case GetHubStatus: + put_unaligned_le32(0, buf); + break; + case GetPortStatus: + if (wIndex != 1) + goto error; + put_unaligned_le32(sl811->port1, buf); + + if (__is_defined(VERBOSE) || + *(u16*)(buf+2)) /* only if wPortChange is interesting */ + dev_dbg(hcd->self.controller, "GetPortStatus %08x\n", + sl811->port1); + break; + case SetPortFeature: + if (wIndex != 1 || wLength != 0) + goto error; + switch (wValue) { + case USB_PORT_FEAT_SUSPEND: + if (sl811->port1 & USB_PORT_STAT_RESET) + goto error; + if (!(sl811->port1 & USB_PORT_STAT_ENABLE)) + goto error; + + dev_dbg(hcd->self.controller,"suspend...\n"); + sl811->ctrl1 &= ~SL11H_CTL1MASK_SOF_ENA; + sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1); + break; + case USB_PORT_FEAT_POWER: + port_power(sl811, 1); + break; + case USB_PORT_FEAT_RESET: + if (sl811->port1 & USB_PORT_STAT_SUSPEND) + goto error; + if (!(sl811->port1 & USB_PORT_STAT_POWER)) + break; + + /* 50 msec of reset/SE0 signaling, irqs blocked */ + sl811->irq_enable = 0; + sl811_write(sl811, SL11H_IRQ_ENABLE, + sl811->irq_enable); + sl811->ctrl1 = SL11H_CTL1MASK_SE0; + sl811_write(sl811, SL11H_CTLREG1, sl811->ctrl1); + sl811->port1 |= USB_PORT_STAT_RESET; + mod_timer(&sl811->timer, jiffies + + msecs_to_jiffies(50)); + break; + default: + goto error; + } + sl811->port1 |= 1 << wValue; + break; + + default: +error: + /* "protocol stall" on error */ + retval = -EPIPE; + } + + spin_unlock_irqrestore(&sl811->lock, flags); + return retval; +} + +#ifdef CONFIG_PM + +static int +sl811h_bus_suspend(struct usb_hcd *hcd) +{ + // SOFs off + dev_dbg(hcd->self.controller, "%s\n", __func__); + return 0; +} + +static int +sl811h_bus_resume(struct usb_hcd *hcd) +{ + // SOFs on + dev_dbg(hcd->self.controller, "%s\n", __func__); + return 0; +} + +#else + +#define sl811h_bus_suspend NULL +#define sl811h_bus_resume NULL + +#endif + + +/*-------------------------------------------------------------------------*/ + +static void dump_irq(struct seq_file *s, char *label, u8 mask) +{ + seq_printf(s, "%s %02x%s%s%s%s%s%s\n", label, mask, + (mask & SL11H_INTMASK_DONE_A) ? " done_a" : "", + (mask & SL11H_INTMASK_DONE_B) ? " done_b" : "", + (mask & SL11H_INTMASK_SOFINTR) ? " sof" : "", + (mask & SL11H_INTMASK_INSRMV) ? " ins/rmv" : "", + (mask & SL11H_INTMASK_RD) ? " rd" : "", + (mask & SL11H_INTMASK_DP) ? " dp" : ""); +} + +static int sl811h_debug_show(struct seq_file *s, void *unused) +{ + struct sl811 *sl811 = s->private; + struct sl811h_ep *ep; + unsigned i; + + seq_printf(s, "%s\n%s version %s\nportstatus[1] = %08x\n", + sl811_to_hcd(sl811)->product_desc, + hcd_name, DRIVER_VERSION, + sl811->port1); + + seq_printf(s, "insert/remove: %ld\n", sl811->stat_insrmv); + seq_printf(s, "current session: done_a %ld done_b %ld " + "wake %ld sof %ld overrun %ld lost %ld\n\n", + sl811->stat_a, sl811->stat_b, + sl811->stat_wake, sl811->stat_sof, + sl811->stat_overrun, sl811->stat_lost); + + spin_lock_irq(&sl811->lock); + + if (sl811->ctrl1 & SL11H_CTL1MASK_SUSPEND) + seq_printf(s, "(suspended)\n\n"); + else { + u8 t = sl811_read(sl811, SL11H_CTLREG1); + + seq_printf(s, "ctrl1 %02x%s%s%s%s\n", t, + (t & SL11H_CTL1MASK_SOF_ENA) ? " sofgen" : "", + ({char *s; switch (t & SL11H_CTL1MASK_FORCE) { + case SL11H_CTL1MASK_NORMAL: s = ""; break; + case SL11H_CTL1MASK_SE0: s = " se0/reset"; break; + case SL11H_CTL1MASK_K: s = " k/resume"; break; + default: s = "j"; break; + } s; }), + (t & SL11H_CTL1MASK_LSPD) ? " lowspeed" : "", + (t & SL11H_CTL1MASK_SUSPEND) ? " suspend" : ""); + + dump_irq(s, "irq_enable", + sl811_read(sl811, SL11H_IRQ_ENABLE)); + dump_irq(s, "irq_status", + sl811_read(sl811, SL11H_IRQ_STATUS)); + seq_printf(s, "frame clocks remaining: %d\n", + sl811_read(sl811, SL11H_SOFTMRREG) << 6); + } + + seq_printf(s, "A: qh%p ctl %02x sts %02x\n", sl811->active_a, + sl811_read(sl811, SL811_EP_A(SL11H_HOSTCTLREG)), + sl811_read(sl811, SL811_EP_A(SL11H_PKTSTATREG))); + seq_printf(s, "B: qh%p ctl %02x sts %02x\n", sl811->active_b, + sl811_read(sl811, SL811_EP_B(SL11H_HOSTCTLREG)), + sl811_read(sl811, SL811_EP_B(SL11H_PKTSTATREG))); + seq_printf(s, "\n"); + list_for_each_entry (ep, &sl811->async, schedule) { + struct urb *urb; + + seq_printf(s, "%s%sqh%p, ep%d%s, maxpacket %d" + " nak %d err %d\n", + (ep == sl811->active_a) ? "(A) " : "", + (ep == sl811->active_b) ? "(B) " : "", + ep, ep->epnum, + ({ char *s; switch (ep->nextpid) { + case USB_PID_IN: s = "in"; break; + case USB_PID_OUT: s = "out"; break; + case USB_PID_SETUP: s = "setup"; break; + case USB_PID_ACK: s = "status"; break; + default: s = "?"; break; + } s;}), + ep->maxpacket, + ep->nak_count, ep->error_count); + list_for_each_entry (urb, &ep->hep->urb_list, urb_list) { + seq_printf(s, " urb%p, %d/%d\n", urb, + urb->actual_length, + urb->transfer_buffer_length); + } + } + if (!list_empty(&sl811->async)) + seq_printf(s, "\n"); + + seq_printf(s, "periodic size= %d\n", PERIODIC_SIZE); + + for (i = 0; i < PERIODIC_SIZE; i++) { + ep = sl811->periodic[i]; + if (!ep) + continue; + seq_printf(s, "%2d [%3d]:\n", i, sl811->load[i]); + + /* DUMB: prints shared entries multiple times */ + do { + seq_printf(s, + " %s%sqh%d/%p (%sdev%d ep%d%s max %d) " + "err %d\n", + (ep == sl811->active_a) ? "(A) " : "", + (ep == sl811->active_b) ? "(B) " : "", + ep->period, ep, + (ep->udev->speed == USB_SPEED_FULL) + ? "" : "ls ", + ep->udev->devnum, ep->epnum, + (ep->epnum == 0) ? "" + : ((ep->nextpid == USB_PID_IN) + ? "in" + : "out"), + ep->maxpacket, ep->error_count); + ep = ep->next; + } while (ep); + } + + spin_unlock_irq(&sl811->lock); + seq_printf(s, "\n"); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(sl811h_debug); + +/* expect just one sl811 per system */ +static void create_debug_file(struct sl811 *sl811) +{ + debugfs_create_file("sl811h", S_IRUGO, usb_debug_root, sl811, + &sl811h_debug_fops); +} + +static void remove_debug_file(struct sl811 *sl811) +{ + debugfs_lookup_and_remove("sl811h", usb_debug_root); +} + +/*-------------------------------------------------------------------------*/ + +static void +sl811h_stop(struct usb_hcd *hcd) +{ + struct sl811 *sl811 = hcd_to_sl811(hcd); + unsigned long flags; + + del_timer_sync(&hcd->rh_timer); + + spin_lock_irqsave(&sl811->lock, flags); + port_power(sl811, 0); + spin_unlock_irqrestore(&sl811->lock, flags); +} + +static int +sl811h_start(struct usb_hcd *hcd) +{ + struct sl811 *sl811 = hcd_to_sl811(hcd); + + /* chip has been reset, VBUS power is off */ + hcd->state = HC_STATE_RUNNING; + + if (sl811->board) { + if (!device_can_wakeup(hcd->self.controller)) + device_init_wakeup(hcd->self.controller, + sl811->board->can_wakeup); + hcd->power_budget = sl811->board->power * 2; + } + + /* enable power and interrupts */ + port_power(sl811, 1); + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static const struct hc_driver sl811h_hc_driver = { + .description = hcd_name, + .hcd_priv_size = sizeof(struct sl811), + + /* + * generic hardware linkage + */ + .irq = sl811h_irq, + .flags = HCD_USB11 | HCD_MEMORY, + + /* Basic lifecycle operations */ + .start = sl811h_start, + .stop = sl811h_stop, + + /* + * managing i/o requests and associated device resources + */ + .urb_enqueue = sl811h_urb_enqueue, + .urb_dequeue = sl811h_urb_dequeue, + .endpoint_disable = sl811h_endpoint_disable, + + /* + * periodic schedule support + */ + .get_frame_number = sl811h_get_frame, + + /* + * root hub support + */ + .hub_status_data = sl811h_hub_status_data, + .hub_control = sl811h_hub_control, + .bus_suspend = sl811h_bus_suspend, + .bus_resume = sl811h_bus_resume, +}; + +/*-------------------------------------------------------------------------*/ + +static int +sl811h_remove(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct sl811 *sl811 = hcd_to_sl811(hcd); + struct resource *res; + + remove_debug_file(sl811); + usb_remove_hcd(hcd); + + /* some platforms may use IORESOURCE_IO */ + res = platform_get_resource(dev, IORESOURCE_MEM, 1); + if (res) + iounmap(sl811->data_reg); + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (res) + iounmap(sl811->addr_reg); + + usb_put_hcd(hcd); + return 0; +} + +static int +sl811h_probe(struct platform_device *dev) +{ + struct usb_hcd *hcd; + struct sl811 *sl811; + struct resource *addr, *data, *ires; + int irq; + void __iomem *addr_reg; + void __iomem *data_reg; + int retval; + u8 tmp, ioaddr; + unsigned long irqflags; + + if (usb_disabled()) + return -ENODEV; + + /* the chip may be wired for either kind of addressing */ + addr = platform_get_mem_or_io(dev, 0); + data = platform_get_mem_or_io(dev, 1); + if (!addr || !data || resource_type(addr) != resource_type(data)) + return -ENODEV; + + /* basic sanity checks first. board-specific init logic should + * have initialized these three resources and probably board + * specific platform_data. we don't probe for IRQs, and do only + * minimal sanity checking. + */ + ires = platform_get_resource(dev, IORESOURCE_IRQ, 0); + if (dev->num_resources < 3 || !ires) + return -ENODEV; + + irq = ires->start; + irqflags = ires->flags & IRQF_TRIGGER_MASK; + + ioaddr = resource_type(addr) == IORESOURCE_IO; + if (ioaddr) { + /* + * NOTE: 64-bit resource->start is getting truncated + * to avoid compiler warning, assuming that ->start + * is always 32-bit for this case + */ + addr_reg = (void __iomem *) (unsigned long) addr->start; + data_reg = (void __iomem *) (unsigned long) data->start; + } else { + addr_reg = ioremap(addr->start, 1); + if (addr_reg == NULL) { + retval = -ENOMEM; + goto err2; + } + + data_reg = ioremap(data->start, 1); + if (data_reg == NULL) { + retval = -ENOMEM; + goto err4; + } + } + + /* allocate and initialize hcd */ + hcd = usb_create_hcd(&sl811h_hc_driver, &dev->dev, dev_name(&dev->dev)); + if (!hcd) { + retval = -ENOMEM; + goto err5; + } + hcd->rsrc_start = addr->start; + sl811 = hcd_to_sl811(hcd); + + spin_lock_init(&sl811->lock); + INIT_LIST_HEAD(&sl811->async); + sl811->board = dev_get_platdata(&dev->dev); + timer_setup(&sl811->timer, sl811h_timer, 0); + sl811->addr_reg = addr_reg; + sl811->data_reg = data_reg; + + spin_lock_irq(&sl811->lock); + port_power(sl811, 0); + spin_unlock_irq(&sl811->lock); + msleep(200); + + tmp = sl811_read(sl811, SL11H_HWREVREG); + switch (tmp >> 4) { + case 1: + hcd->product_desc = "SL811HS v1.2"; + break; + case 2: + hcd->product_desc = "SL811HS v1.5"; + break; + default: + /* reject case 0, SL11S is less functional */ + dev_dbg(&dev->dev, "chiprev %02x\n", tmp); + retval = -ENXIO; + goto err6; + } + + /* The chip's IRQ is level triggered, active high. A requirement + * for platform device setup is to cope with things like signal + * inverters (e.g. CF is active low) or working only with edge + * triggers (e.g. most ARM CPUs). Initial driver stress testing + * was on a system with single edge triggering, so most sorts of + * triggering arrangement should work. + * + * Use resource IRQ flags if set by platform device setup. + */ + irqflags |= IRQF_SHARED; + retval = usb_add_hcd(hcd, irq, irqflags); + if (retval != 0) + goto err6; + + device_wakeup_enable(hcd->self.controller); + + create_debug_file(sl811); + return retval; + + err6: + usb_put_hcd(hcd); + err5: + if (!ioaddr) + iounmap(data_reg); + err4: + if (!ioaddr) + iounmap(addr_reg); + err2: + dev_dbg(&dev->dev, "init error, %d\n", retval); + return retval; +} + +#ifdef CONFIG_PM + +/* for this device there's no useful distinction between the controller + * and its root hub. + */ + +static int +sl811h_suspend(struct platform_device *dev, pm_message_t state) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct sl811 *sl811 = hcd_to_sl811(hcd); + int retval = 0; + + switch (state.event) { + case PM_EVENT_FREEZE: + retval = sl811h_bus_suspend(hcd); + break; + case PM_EVENT_SUSPEND: + case PM_EVENT_HIBERNATE: + case PM_EVENT_PRETHAW: /* explicitly discard hw state */ + port_power(sl811, 0); + break; + } + return retval; +} + +static int +sl811h_resume(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct sl811 *sl811 = hcd_to_sl811(hcd); + + /* with no "check to see if VBUS is still powered" board hook, + * let's assume it'd only be powered to enable remote wakeup. + */ + if (!sl811->port1 || !device_can_wakeup(&hcd->self.root_hub->dev)) { + sl811->port1 = 0; + port_power(sl811, 1); + usb_root_hub_lost_power(hcd->self.root_hub); + return 0; + } + + return sl811h_bus_resume(hcd); +} + +#else + +#define sl811h_suspend NULL +#define sl811h_resume NULL + +#endif + + +/* this driver is exported so sl811_cs can depend on it */ +struct platform_driver sl811h_driver = { + .probe = sl811h_probe, + .remove = sl811h_remove, + + .suspend = sl811h_suspend, + .resume = sl811h_resume, + .driver = { + .name = hcd_name, + }, +}; +EXPORT_SYMBOL(sl811h_driver); + +module_platform_driver(sl811h_driver); |