diff options
Diffstat (limited to 'drivers/usb/host/uhci-hcd.h')
| -rw-r--r-- | drivers/usb/host/uhci-hcd.h | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h new file mode 100644 index 00000000000..02255d69e1f --- /dev/null +++ b/drivers/usb/host/uhci-hcd.h @@ -0,0 +1,454 @@ +#ifndef __LINUX_UHCI_HCD_H +#define __LINUX_UHCI_HCD_H + +#include <linux/list.h> +#include <linux/usb.h> + +#define usb_packetid(pipe) (usb_pipein(pipe) ? USB_PID_IN : USB_PID_OUT) +#define PIPE_DEVEP_MASK 0x0007ff00 + +/* + * Universal Host Controller Interface data structures and defines + */ + +/* Command register */ +#define USBCMD 0 +#define USBCMD_RS 0x0001 /* Run/Stop */ +#define USBCMD_HCRESET 0x0002 /* Host reset */ +#define USBCMD_GRESET 0x0004 /* Global reset */ +#define USBCMD_EGSM 0x0008 /* Global Suspend Mode */ +#define USBCMD_FGR 0x0010 /* Force Global Resume */ +#define USBCMD_SWDBG 0x0020 /* SW Debug mode */ +#define USBCMD_CF 0x0040 /* Config Flag (sw only) */ +#define USBCMD_MAXP 0x0080 /* Max Packet (0 = 32, 1 = 64) */ + +/* Status register */ +#define USBSTS 2 +#define USBSTS_USBINT 0x0001 /* Interrupt due to IOC */ +#define USBSTS_ERROR 0x0002 /* Interrupt due to error */ +#define USBSTS_RD 0x0004 /* Resume Detect */ +#define USBSTS_HSE 0x0008 /* Host System Error - basically PCI problems */ +#define USBSTS_HCPE 0x0010 /* Host Controller Process Error - the scripts were buggy */ +#define USBSTS_HCH 0x0020 /* HC Halted */ + +/* Interrupt enable register */ +#define USBINTR 4 +#define USBINTR_TIMEOUT 0x0001 /* Timeout/CRC error enable */ +#define USBINTR_RESUME 0x0002 /* Resume interrupt enable */ +#define USBINTR_IOC 0x0004 /* Interrupt On Complete enable */ +#define USBINTR_SP 0x0008 /* Short packet interrupt enable */ + +#define USBFRNUM 6 +#define USBFLBASEADD 8 +#define USBSOF 12 + +/* USB port status and control registers */ +#define USBPORTSC1 16 +#define USBPORTSC2 18 +#define USBPORTSC_CCS 0x0001 /* Current Connect Status ("device present") */ +#define USBPORTSC_CSC 0x0002 /* Connect Status Change */ +#define USBPORTSC_PE 0x0004 /* Port Enable */ +#define USBPORTSC_PEC 0x0008 /* Port Enable Change */ +#define USBPORTSC_DPLUS 0x0010 /* D+ high (line status) */ +#define USBPORTSC_DMINUS 0x0020 /* D- high (line status) */ +#define USBPORTSC_RD 0x0040 /* Resume Detect */ +#define USBPORTSC_RES1 0x0080 /* reserved, always 1 */ +#define USBPORTSC_LSDA 0x0100 /* Low Speed Device Attached */ +#define USBPORTSC_PR 0x0200 /* Port Reset */ +/* OC and OCC from Intel 430TX and later (not UHCI 1.1d spec) */ +#define USBPORTSC_OC 0x0400 /* Over Current condition */ +#define USBPORTSC_OCC 0x0800 /* Over Current Change R/WC */ +#define USBPORTSC_SUSP 0x1000 /* Suspend */ +#define USBPORTSC_RES2 0x2000 /* reserved, write zeroes */ +#define USBPORTSC_RES3 0x4000 /* reserved, write zeroes */ +#define USBPORTSC_RES4 0x8000 /* reserved, write zeroes */ + +/* Legacy support register */ +#define USBLEGSUP 0xc0 +#define USBLEGSUP_DEFAULT 0x2000 /* only PIRQ enable set */ + +#define UHCI_NULL_DATA_SIZE 0x7FF /* for UHCI controller TD */ + +#define UHCI_PTR_BITS cpu_to_le32(0x000F) +#define UHCI_PTR_TERM cpu_to_le32(0x0001) +#define UHCI_PTR_QH cpu_to_le32(0x0002) +#define UHCI_PTR_DEPTH cpu_to_le32(0x0004) +#define UHCI_PTR_BREADTH cpu_to_le32(0x0000) + +#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 future frames can be scheduled */ + +struct uhci_frame_list { + __le32 frame[UHCI_NUMFRAMES]; + + void *frame_cpu[UHCI_NUMFRAMES]; + + dma_addr_t dma_handle; +}; + +struct urb_priv; + +/* + * One role of a QH is to hold a queue of TDs for some endpoint. Each QH is + * used with one URB, and qh->element (updated by the HC) is either: + * - the next unprocessed TD for the URB, or + * - UHCI_PTR_TERM (when there's no more traffic for this endpoint), or + * - the QH for the next URB queued to the same 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 frame list, qh->link maintains a list of QHs seen by the HC: + * skel1 --> ep1-qh --> ep2-qh --> ... --> skel2 --> ... + */ +struct uhci_qh { + /* Hardware fields */ + __le32 link; /* Next queue */ + __le32 element; /* Queue element pointer */ + + /* Software fields */ + dma_addr_t dma_handle; + + struct usb_device *dev; + struct urb_priv *urbp; + + struct list_head list; /* P: uhci->frame_list_lock */ + struct list_head remove_list; /* P: uhci->remove_list_lock */ +} __attribute__((aligned(16))); + +/* + * We need a special accessor for the element pointer because it is + * subject to asynchronous updates by the controller + */ +static __le32 inline qh_element(struct uhci_qh *qh) { + __le32 element = qh->element; + + barrier(); + return element; +} + +/* + * for TD <status>: + */ +#define TD_CTRL_SPD (1 << 29) /* Short Packet Detect */ +#define TD_CTRL_C_ERR_MASK (3 << 27) /* Error Counter bits */ +#define TD_CTRL_C_ERR_SHIFT 27 +#define TD_CTRL_LS (1 << 26) /* Low Speed Device */ +#define TD_CTRL_IOS (1 << 25) /* Isochronous Select */ +#define TD_CTRL_IOC (1 << 24) /* Interrupt on Complete */ +#define TD_CTRL_ACTIVE (1 << 23) /* TD Active */ +#define TD_CTRL_STALLED (1 << 22) /* TD Stalled */ +#define TD_CTRL_DBUFERR (1 << 21) /* Data Buffer Error */ +#define TD_CTRL_BABBLE (1 << 20) /* Babble Detected */ +#define TD_CTRL_NAK (1 << 19) /* NAK Received */ +#define TD_CTRL_CRCTIMEO (1 << 18) /* CRC/Time Out Error */ +#define TD_CTRL_BITSTUFF (1 << 17) /* Bit Stuff Error */ +#define TD_CTRL_ACTLEN_MASK 0x7FF /* actual length, encoded as n - 1 */ + +#define TD_CTRL_ANY_ERROR (TD_CTRL_STALLED | TD_CTRL_DBUFERR | \ + TD_CTRL_BABBLE | TD_CTRL_CRCTIME | TD_CTRL_BITSTUFF) + +#define uhci_maxerr(err) ((err) << TD_CTRL_C_ERR_SHIFT) +#define uhci_status_bits(ctrl_sts) ((ctrl_sts) & 0xF60000) +#define uhci_actual_length(ctrl_sts) (((ctrl_sts) + 1) & TD_CTRL_ACTLEN_MASK) /* 1-based */ + +/* + * for TD <info>: (a.k.a. Token) + */ +#define td_token(td) le32_to_cpu((td)->token) +#define TD_TOKEN_DEVADDR_SHIFT 8 +#define TD_TOKEN_TOGGLE_SHIFT 19 +#define TD_TOKEN_TOGGLE (1 << 19) +#define TD_TOKEN_EXPLEN_SHIFT 21 +#define TD_TOKEN_EXPLEN_MASK 0x7FF /* expected length, encoded as n - 1 */ +#define TD_TOKEN_PID_MASK 0xFF + +#define uhci_explen(len) ((len) << TD_TOKEN_EXPLEN_SHIFT) + +#define uhci_expected_length(token) ((((token) >> 21) + 1) & TD_TOKEN_EXPLEN_MASK) +#define uhci_toggle(token) (((token) >> TD_TOKEN_TOGGLE_SHIFT) & 1) +#define uhci_endpoint(token) (((token) >> 15) & 0xf) +#define uhci_devaddr(token) (((token) >> TD_TOKEN_DEVADDR_SHIFT) & 0x7f) +#define uhci_devep(token) (((token) >> TD_TOKEN_DEVADDR_SHIFT) & 0x7ff) +#define uhci_packetid(token) ((token) & TD_TOKEN_PID_MASK) +#define uhci_packetout(token) (uhci_packetid(token) != USB_PID_IN) +#define uhci_packetin(token) (uhci_packetid(token) == USB_PID_IN) + +/* + * 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 as far as I can tell. + * + * But let's just go with the documentation, at least for 32-bit machines. + * On 64-bit machines we probably want to take advantage of the fact that + * hw doesn't really care about the size of the sw-only area. + * + * Alas, not anymore, we have more than 4 words for software, woops. + * Everything still works tho, surprise! -jerdfelt + * + * 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 (for queued urbs) + */ +struct uhci_td { + /* Hardware fields */ + __le32 link; + __le32 status; + __le32 token; + __le32 buffer; + + /* Software fields */ + dma_addr_t dma_handle; + + struct usb_device *dev; + struct urb *urb; + + struct list_head list; /* P: urb->lock */ + struct list_head remove_list; /* P: uhci->td_remove_list_lock */ + + int frame; /* for iso: what frame? */ + struct list_head fl_list; /* P: uhci->frame_list_lock */ +} __attribute__((aligned(16))); + +/* + * We need a special accessor for the control/status word because it is + * subject to asynchronous updates by the controller + */ +static u32 inline td_status(struct uhci_td *td) { + __le32 status = td->status; + + barrier(); + return le32_to_cpu(status); +} + + +/* + * The UHCI driver places Interrupt, Control and Bulk into QH's both + * to group together TD's for one transfer, and also to faciliate queuing + * of URB's. To make it easy to insert entries into the schedule, we have + * a skeleton of QH's for each predefined Interrupt latency, low-speed + * control, full-speed control and terminating QH (see explanation for + * the terminating QH below). + * + * When we want to add a new QH, we add it to the end of the list for the + * skeleton QH. + * + * For instance, the queue can look like this: + * + * skel int128 QH + * dev 1 interrupt QH + * dev 5 interrupt QH + * skel int64 QH + * skel int32 QH + * ... + * skel int1 QH + * skel low-speed control QH + * dev 5 control QH + * skel full-speed control QH + * skel bulk QH + * dev 1 bulk QH + * dev 2 bulk QH + * skel terminating QH + * + * The terminating QH is used for 2 reasons: + * - To place a terminating TD which is used to workaround a PIIX bug + * (see Intel errata for explanation) + * - To loop back to the full-speed control queue for full-speed bandwidth + * reclamation + * + * Isochronous transfers are stored before the start of the skeleton + * schedule and don't use QH's. While the UHCI spec doesn't forbid the + * use of QH's for Isochronous, it doesn't use them either. Since we don't + * need to use them either, we follow the spec diagrams in hope that it'll + * be more compatible with future UHCI implementations. + */ + +#define UHCI_NUM_SKELQH 12 +#define skel_int128_qh skelqh[0] +#define skel_int64_qh skelqh[1] +#define skel_int32_qh skelqh[2] +#define skel_int16_qh skelqh[3] +#define skel_int8_qh skelqh[4] +#define skel_int4_qh skelqh[5] +#define skel_int2_qh skelqh[6] +#define skel_int1_qh skelqh[7] +#define skel_ls_control_qh skelqh[8] +#define skel_fs_control_qh skelqh[9] +#define skel_bulk_qh skelqh[10] +#define skel_term_qh skelqh[11] + +/* + * Search tree for determining where <interval> fits in the skelqh[] + * skeleton. + * + * An interrupt request should be placed into the slowest skelqh[] + * which meets the interval/period/frequency requirement. + * An interrupt request is allowed to be faster than <interval> but not slower. + * + * For a given <interval>, this function returns the appropriate/matching + * skelqh[] index value. + */ +static inline int __interval_to_skel(int interval) +{ + if (interval < 16) { + if (interval < 4) { + if (interval < 2) + return 7; /* int1 for 0-1 ms */ + return 6; /* int2 for 2-3 ms */ + } + if (interval < 8) + return 5; /* int4 for 4-7 ms */ + return 4; /* int8 for 8-15 ms */ + } + if (interval < 64) { + if (interval < 32) + return 3; /* int16 for 16-31 ms */ + return 2; /* int32 for 32-63 ms */ + } + if (interval < 128) + return 1; /* int64 for 64-127 ms */ + return 0; /* int128 for 128-255 ms (Max.) */ +} + +/* + * Device states for the host controller. + * + * To prevent "bouncing" in the presence of electrical noise, + * we insist on a 1-second "grace" period, before switching to + * the RUNNING or SUSPENDED states, during which the state is + * not allowed to change. + * + * The resume process is divided into substates in order to avoid + * potentially length delays during the timer handler. + * + * States in which the host controller is halted must have values <= 0. + */ +enum uhci_state { + UHCI_RESET, + UHCI_RUNNING_GRACE, /* Before RUNNING */ + UHCI_RUNNING, /* The normal state */ + UHCI_SUSPENDING_GRACE, /* Before SUSPENDED */ + UHCI_SUSPENDED = -10, /* When no devices are attached */ + UHCI_RESUMING_1, + UHCI_RESUMING_2 +}; + +/* + * This describes the full uhci information. + * + * Note how the "proper" USB information is just + * a subset of what the full implementation needs. + */ +struct uhci_hcd { + + /* debugfs */ + struct dentry *dentry; + + /* Grabbed from PCI */ + unsigned long io_addr; + + struct dma_pool *qh_pool; + struct dma_pool *td_pool; + + struct usb_bus *bus; + + struct uhci_td *term_td; /* Terminating TD, see UHCI bug */ + struct uhci_qh *skelqh[UHCI_NUM_SKELQH]; /* Skeleton QH's */ + + spinlock_t lock; + struct uhci_frame_list *fl; /* P: uhci->lock */ + int fsbr; /* Full-speed bandwidth reclamation */ + unsigned long fsbrtimeout; /* FSBR delay */ + + enum uhci_state state; /* FIXME: needs a spinlock */ + unsigned long state_end; /* Time of next transition */ + unsigned int frame_number; /* As of last check */ + unsigned int is_stopped; +#define UHCI_IS_STOPPED 9999 /* Larger than a frame # */ + + unsigned int scan_in_progress:1; /* Schedule scan is running */ + unsigned int need_rescan:1; /* Redo the schedule scan */ + unsigned int resume_detect:1; /* Need a Global Resume */ + + /* Support for port suspend/resume/reset */ + unsigned long port_c_suspend; /* Bit-arrays of ports */ + unsigned long suspended_ports; + unsigned long resuming_ports; + unsigned long ports_timeout; /* Time to stop signalling */ + + /* Main list of URB's currently controlled by this HC */ + struct list_head urb_list; /* P: uhci->lock */ + + /* List of QH's that are done, but waiting to be unlinked (race) */ + struct list_head qh_remove_list; /* P: uhci->lock */ + unsigned int qh_remove_age; /* Age in frames */ + + /* List of TD's that are done, but waiting to be freed (race) */ + struct list_head td_remove_list; /* P: uhci->lock */ + unsigned int td_remove_age; /* Age in frames */ + + /* List of asynchronously unlinked URB's */ + struct list_head urb_remove_list; /* P: uhci->lock */ + unsigned int urb_remove_age; /* Age in frames */ + + /* List of URB's awaiting completion callback */ + struct list_head complete_list; /* P: uhci->lock */ + + int rh_numports; + + struct timer_list stall_timer; + + wait_queue_head_t waitqh; /* endpoint_disable waiters */ +}; + +/* Convert between a usb_hcd pointer and the corresponding uhci_hcd */ +static inline struct uhci_hcd *hcd_to_uhci(struct usb_hcd *hcd) +{ + return (struct uhci_hcd *) (hcd->hcd_priv); +} +static inline struct usb_hcd *uhci_to_hcd(struct uhci_hcd *uhci) +{ + return container_of((void *) uhci, struct usb_hcd, hcd_priv); +} + +#define uhci_dev(u) (uhci_to_hcd(u)->self.controller) + +struct urb_priv { + struct list_head urb_list; + + struct urb *urb; + + struct uhci_qh *qh; /* QH for this URB */ + struct list_head td_list; /* P: urb->lock */ + + unsigned fsbr : 1; /* URB turned on FSBR */ + unsigned fsbr_timeout : 1; /* URB timed out on FSBR */ + unsigned queued : 1; /* QH was queued (not linked in) */ + unsigned short_control_packet : 1; /* If we get a short packet during */ + /* a control transfer, retrigger */ + /* the status phase */ + + unsigned long inserttime; /* In jiffies */ + unsigned long fsbrtime; /* In jiffies */ + + struct list_head queue_list; /* P: uhci->frame_list_lock */ +}; + +/* + * Locking in uhci.c + * + * Almost everything relating to the hardware schedule and processing + * of URBs is protected by uhci->lock. urb->status is protected by + * urb->lock; that's the one exception. + * + * To prevent deadlocks, never lock uhci->lock while holding urb->lock. + * The safe order of locking is: + * + * #1 uhci->lock + * #2 urb->lock + */ + +#endif |