#define UHCI_NUMFRAMES 1024 /* in the frame list [array] */ #define UHCI_MAX_SOF_NUMBER 2047 /* in an SOF packet */ #define CAN_SCHEDULE_FRAMES 1000 /* how far in the future frames
* can be scheduled */ #define MAX_PHASE 32 /* Periodic scheduling length */
/* When no queues need Full-Speed Bandwidth Reclamation,
* delay this long before turning FSBR off */ #define FSBR_OFF_DELAY msecs_to_jiffies(10)
/* If a queue hasn't advanced after this much time, assume it is stuck */ #define QH_WAIT_TIMEOUT msecs_to_jiffies(200)
/* * __hc32 and __hc16 are "Host Controller" types, they may be equivalent to * __leXX (normally) or __beXX (given UHCI_BIG_ENDIAN_DESC), depending on * the host controller implementation. * * To facilitate the strongest possible byte-order checking from "sparse" * and so on, we use __leXX unless that's not practical.
*/ #ifdef CONFIG_USB_UHCI_BIG_ENDIAN_DESC typedef __u32 __bitwise __hc32; typedef __u16 __bitwise __hc16; #else #define __hc32 __le32 #define __hc16 __le16 #endif
/* * Queue Headers
*/
/* * One role of a QH is to hold a queue of TDs for some endpoint. One QH goes * with each endpoint, and qh->element (updated by the HC) is either: * - the next unprocessed TD in the endpoint's queue, or * - UHCI_PTR_TERM (when there's no more traffic for this endpoint). * * The other role of a QH is to serve as a "skeleton" framelist entry, so we * can easily splice a QH for some endpoint into the schedule at the right * place. Then qh->element is UHCI_PTR_TERM. * * In the schedule, qh->link maintains a list of QHs seen by the HC: * skel1 --> ep1-qh --> ep2-qh --> ... --> skel2 --> ... * * qh->node is the software equivalent of qh->link. The differences * are that the software list is doubly-linked and QHs in the UNLINKING * state are on the software list but not the hardware schedule. * * For bookkeeping purposes we maintain QHs even for Isochronous endpoints, * but they never get added to the hardware schedule.
*/ #define QH_STATE_IDLE 1 /* QH is not being used */ #define QH_STATE_UNLINKING 2 /* QH has been removed from the * schedule but the hardware may
* still be using it */ #define QH_STATE_ACTIVE 3 /* QH is on the schedule */
struct uhci_qh { /* Hardware fields */
__hc32 link; /* Next QH in the schedule */
__hc32 element; /* Queue element (TD) pointer */
/* Software fields */
dma_addr_t dma_handle;
struct list_head node; /* Node in the list of QHs */ struct usb_host_endpoint *hep; /* Endpoint information */ struct usb_device *udev; struct list_head queue; /* Queue of urbps for this QH */ struct uhci_td *dummy_td; /* Dummy TD to end the queue */ struct uhci_td *post_td; /* Last TD completed */
struct usb_iso_packet_descriptor *iso_packet_desc; /* Next urb->iso_frame_desc entry */ unsignedlong advance_jiffies; /* Time of last queue advance */ unsignedint unlink_frame; /* When the QH was unlinked */ unsignedint period; /* For Interrupt and Isochronous QHs */ short phase; /* Between 0 and period-1 */ short load; /* Periodic time requirement, in us */ unsignedint iso_frame; /* Frame # for iso_packet_desc */
int state; /* QH_STATE_xxx; see above */ int type; /* Queue type (control, bulk, etc) */ int skel; /* Skeleton queue number */
unsignedint initial_toggle:1; /* Endpoint's current toggle value */ unsignedint needs_fixup:1; /* Must fix the TD toggle values */ unsignedint is_stopped:1; /* Queue was stopped by error/unlink */ unsignedint wait_expired:1; /* QH_WAIT_TIMEOUT has expired */ unsignedint bandwidth_reserved:1; /* Periodic bandwidth has
* been allocated */
} __attribute__((aligned(16)));
/* * We need a special accessor for the element pointer because it is * subject to asynchronous updates by the controller.
*/ #define qh_element(qh) READ_ONCE((qh)->element)
/* * The documentation says "4 words for hardware, 4 words for software". * * That's silly, the hardware doesn't care. The hardware only cares that * the hardware words are 16-byte aligned, and we can have any amount of * sw space after the TD entry. * * td->link points to either another TD (not necessarily for the same urb or * even the same endpoint), or nothing (PTR_TERM), or a QH.
*/ struct uhci_td { /* Hardware fields */
__hc32 link;
__hc32 status;
__hc32 token;
__hc32 buffer;
/* Software fields */
dma_addr_t dma_handle;
struct list_head list;
int frame; /* for iso: what frame? */ struct list_head fl_list;
} __attribute__((aligned(16)));
/* * We need a special accessor for the control/status word because it is * subject to asynchronous updates by the controller.
*/ #define td_status(uhci, td) hc32_to_cpu((uhci), \
READ_ONCE((td)->status))
/* * The UHCI driver uses QHs with Interrupt, Control and Bulk URBs for * automatic queuing. To make it easy to insert entries into the schedule, * we have a skeleton of QHs for each predefined Interrupt latency. * Asynchronous QHs (low-speed control, full-speed control, and bulk) * go onto the period-1 interrupt list, since they all get accessed on * every frame. * * When we want to add a new QH, we add it to the list starting from the * appropriate skeleton QH. For instance, the schedule can look like this: * * skel int128 QH * dev 1 interrupt QH * dev 5 interrupt QH * skel int64 QH * skel int32 QH * ... * skel int1 + async QH * dev 5 low-speed control QH * dev 1 bulk QH * dev 2 bulk QH * * There is a special terminating QH used to keep full-speed bandwidth * reclamation active when no full-speed control or bulk QHs are linked * into the schedule. It has an inactive TD (to work around a PIIX bug, * see the Intel errata) and it points back to itself. * * There's a special skeleton QH for Isochronous QHs which never appears * on the schedule. Isochronous TDs go on the schedule before the * skeleton QHs. The hardware accesses them directly rather than * through their QH, which is used only for bookkeeping purposes. * While the UHCI spec doesn't forbid the use of QHs for Isochronous, * it doesn't use them either. And the spec says that queues never * advance on an error completion status, which makes them totally * unsuitable for Isochronous transfers. * * There's also a special skeleton QH used for QHs which are in the process * of unlinking and so may still be in use by the hardware. It too never * appears on the schedule.
*/
/* The following entries refer to sublists of skel_async_qh */ #define SKEL_LS_CONTROL 20 #define SKEL_FS_CONTROL 21 #define SKEL_FSBR SKEL_FS_CONTROL #define SKEL_BULK 22
/* * The UHCI controller and root hub
*/
/* * States for the root hub: * * To prevent "bouncing" in the presence of electrical noise, * when there are no devices attached we delay for 1 second in the * RUNNING_NODEVS state before switching to the AUTO_STOPPED state. * * (Note that the AUTO_STOPPED state won't be necessary once the hub * driver learns to autosuspend.)
*/ enum uhci_rh_state { /* In the following states the HC must be halted.
* These two must come first. */
UHCI_RH_RESET,
UHCI_RH_SUSPENDED,
UHCI_RH_AUTO_STOPPED,
UHCI_RH_RESUMING,
/* In this state the HC changes from running to halted,
* so it can legally appear either way. */
UHCI_RH_SUSPENDING,
/* In the following states it's an error if the HC is halted.
* These two must come last. */
UHCI_RH_RUNNING, /* The normal state */
UHCI_RH_RUNNING_NODEVS, /* Running with no devices attached */
};
/* * The full UHCI controller information:
*/ struct uhci_hcd { /* Grabbed from PCI */ unsignedlong io_addr;
/* Used when registers are memory mapped */ void __iomem *regs;
struct uhci_td *term_td; /* Terminating TD, see UHCI bug */ struct uhci_qh *skelqh[UHCI_NUM_SKELQH]; /* Skeleton QHs */ struct uhci_qh *next_qh; /* Next QH to scan */
spinlock_t lock;
dma_addr_t frame_dma_handle; /* Hardware frame list */
__hc32 *frame; void **frame_cpu; /* CPU's frame list */
enum uhci_rh_state rh_state; unsignedlong auto_stop_time; /* When to AUTO_STOP */
unsignedint frame_number; /* As of last check */ unsignedint is_stopped; #define UHCI_IS_STOPPED 9999 /* Larger than a frame # */ unsignedint last_iso_frame; /* Frame of last scan */ unsignedint cur_iso_frame; /* Frame for current scan */
unsignedint scan_in_progress:1; /* Schedule scan is running */ unsignedint need_rescan:1; /* Redo the schedule scan */ unsignedint dead:1; /* Controller has died */ unsignedint RD_enable:1; /* Suspended root hub with Resume-Detect interrupts
enabled */ unsignedint is_initialized:1; /* Data structure is usable */ unsignedint fsbr_is_on:1; /* FSBR is turned on */ unsignedint fsbr_is_wanted:1; /* Does any URB want FSBR? */ unsignedint fsbr_expiring:1; /* FSBR is timing out */
struct timer_list fsbr_timer; /* For turning off FBSR */
/* Silicon quirks */ unsignedint oc_low:1; /* OverCurrent bit active low */ unsignedint wait_for_hp:1; /* Wait for HP port reset */ unsignedint big_endian_mmio:1; /* Big endian registers */ unsignedint big_endian_desc:1; /* Big endian descriptors */ unsignedint is_aspeed:1; /* Aspeed impl. workarounds */
/* Support for port suspend/resume/reset */ unsignedlong port_c_suspend; /* Bit-arrays of ports */ unsignedlong resuming_ports; unsignedlong ports_timeout; /* Time to stop signalling */
struct list_head idle_qh_list; /* Where the idle QHs live */
int rh_numports; /* Number of root-hub ports */
wait_queue_head_t waitqh; /* endpoint_disable waiters */ int num_waiting; /* Number of waiters */
int total_load; /* Sum of array values */ short load[MAX_PHASE]; /* Periodic allocations */
struct clk *clk; /* (optional) clock source */
/* Reset host controller */ void (*reset_hc) (struct uhci_hcd *uhci); int (*check_and_reset_hc) (struct uhci_hcd *uhci); /* configure_hc should perform arch specific settings, if needed */ void (*configure_hc) (struct uhci_hcd *uhci); /* Check for broken resume detect interrupts */ int (*resume_detect_interrupts_are_broken) (struct uhci_hcd *uhci); /* Check for broken global suspend */ int (*global_suspend_mode_is_broken) (struct uhci_hcd *uhci);
};
/* Convert between a usb_hcd pointer and the corresponding uhci_hcd */ staticinlinestruct uhci_hcd *hcd_to_uhci(struct usb_hcd *hcd)
{ return (struct uhci_hcd *) (hcd->hcd_priv);
} staticinlinestruct usb_hcd *uhci_to_hcd(struct uhci_hcd *uhci)
{ return container_of((void *) uhci, struct usb_hcd, hcd_priv);
}
/* * Functions used to access controller registers. The UCHI spec says that host * controller I/O registers are mapped into PCI I/O space. For non-PCI hosts * we use memory mapped registers.
*/
#ifdef CONFIG_HAS_IOPORT #define UHCI_IN(x) x #define UHCI_OUT(x) x #else #define UHCI_IN(x) 0 #define UHCI_OUT(x) do { } while (0) #endif
#ifndef CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC /* Support PCI only */ staticinline u32 uhci_readl(conststruct uhci_hcd *uhci, int reg)
{ return inl(uhci->io_addr + reg);
}
/* * The GRLIB GRUSBHC controller can use big endian format for its descriptors. * * UHCI controllers accessed through PCI work normally (little-endian * everywhere), so we don't bother supporting a BE-only mode.
*/ #ifdef CONFIG_USB_UHCI_BIG_ENDIAN_DESC #define uhci_big_endian_desc(u) ((u)->big_endian_desc)
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