2 * xHCI host controller driver
4 * Copyright (C) 2008 Intel Corp.
7 * Some code borrowed from the Linux EHCI driver.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #ifndef __LINUX_XHCI_HCD_H
24 #define __LINUX_XHCI_HCD_H
26 #include <linux/usb.h>
28 #include "../core/hcd.h"
29 /* Code sharing between pci-quirks and xhci hcd */
30 #include "xhci-ext-caps.h"
32 /* xHCI PCI Configuration Registers */
33 #define XHCI_SBRN_OFFSET (0x60)
36 * xHCI register interface.
37 * This corresponds to the eXtensible Host Controller Interface (xHCI)
38 * Revision 0.95 specification
40 * Registers should always be accessed with double word or quad word accesses.
42 * Some xHCI implementations may support 64-bit address pointers. Registers
43 * with 64-bit address pointers should be written to with dword accesses by
44 * writing the low dword first (ptr[0]), then the high dword (ptr[1]) second.
45 * xHCI implementations that do not support 64-bit address pointers will ignore
46 * the high dword, and write order is irrelevant.
50 * struct xhci_cap_regs - xHCI Host Controller Capability Registers.
51 * @hc_capbase: length of the capabilities register and HC version number
52 * @hcs_params1: HCSPARAMS1 - Structural Parameters 1
53 * @hcs_params2: HCSPARAMS2 - Structural Parameters 2
54 * @hcs_params3: HCSPARAMS3 - Structural Parameters 3
55 * @hcc_params: HCCPARAMS - Capability Parameters
56 * @db_off: DBOFF - Doorbell array offset
57 * @run_regs_off: RTSOFF - Runtime register space offset
59 struct xhci_cap_regs {
67 /* Reserved up to (CAPLENGTH - 0x1C) */
68 } __attribute__ ((packed));
70 /* hc_capbase bitmasks */
71 /* bits 7:0 - how long is the Capabilities register */
72 #define HC_LENGTH(p) XHCI_HC_LENGTH(p)
74 #define HC_VERSION(p) (((p) >> 16) & 0xffff)
76 /* HCSPARAMS1 - hcs_params1 - bitmasks */
77 /* bits 0:7, Max Device Slots */
78 #define HCS_MAX_SLOTS(p) (((p) >> 0) & 0xff)
79 #define HCS_SLOTS_MASK 0xff
80 /* bits 8:18, Max Interrupters */
81 #define HCS_MAX_INTRS(p) (((p) >> 8) & 0x7ff)
82 /* bits 24:31, Max Ports - max value is 0x7F = 127 ports */
83 #define HCS_MAX_PORTS(p) (((p) >> 24) & 0x7f)
85 /* HCSPARAMS2 - hcs_params2 - bitmasks */
86 /* bits 0:3, frames or uframes that SW needs to queue transactions
87 * ahead of the HW to meet periodic deadlines */
88 #define HCS_IST(p) (((p) >> 0) & 0xf)
89 /* bits 4:7, max number of Event Ring segments */
90 #define HCS_ERST_MAX(p) (((p) >> 4) & 0xf)
91 /* bit 26 Scratchpad restore - for save/restore HW state - not used yet */
92 /* bits 27:31 number of Scratchpad buffers SW must allocate for the HW */
94 /* HCSPARAMS3 - hcs_params3 - bitmasks */
95 /* bits 0:7, Max U1 to U0 latency for the roothub ports */
96 #define HCS_U1_LATENCY(p) (((p) >> 0) & 0xff)
97 /* bits 16:31, Max U2 to U0 latency for the roothub ports */
98 #define HCS_U2_LATENCY(p) (((p) >> 16) & 0xffff)
100 /* HCCPARAMS - hcc_params - bitmasks */
101 /* true: HC can use 64-bit address pointers */
102 #define HCC_64BIT_ADDR(p) ((p) & (1 << 0))
103 /* true: HC can do bandwidth negotiation */
104 #define HCC_BANDWIDTH_NEG(p) ((p) & (1 << 1))
105 /* true: HC uses 64-byte Device Context structures
106 * FIXME 64-byte context structures aren't supported yet.
108 #define HCC_64BYTE_CONTEXT(p) ((p) & (1 << 2))
109 /* true: HC has port power switches */
110 #define HCC_PPC(p) ((p) & (1 << 3))
111 /* true: HC has port indicators */
112 #define HCS_INDICATOR(p) ((p) & (1 << 4))
113 /* true: HC has Light HC Reset Capability */
114 #define HCC_LIGHT_RESET(p) ((p) & (1 << 5))
115 /* true: HC supports latency tolerance messaging */
116 #define HCC_LTC(p) ((p) & (1 << 6))
117 /* true: no secondary Stream ID Support */
118 #define HCC_NSS(p) ((p) & (1 << 7))
119 /* Max size for Primary Stream Arrays - 2^(n+1), where n is bits 12:15 */
120 #define HCC_MAX_PSA (1 << ((((p) >> 12) & 0xf) + 1))
121 /* Extended Capabilities pointer from PCI base - section 5.3.6 */
122 #define HCC_EXT_CAPS(p) XHCI_HCC_EXT_CAPS(p)
124 /* db_off bitmask - bits 0:1 reserved */
125 #define DBOFF_MASK (~0x3)
127 /* run_regs_off bitmask - bits 0:4 reserved */
128 #define RTSOFF_MASK (~0x1f)
131 /* Number of registers per port */
132 #define NUM_PORT_REGS 4
135 * struct xhci_op_regs - xHCI Host Controller Operational Registers.
136 * @command: USBCMD - xHC command register
137 * @status: USBSTS - xHC status register
138 * @page_size: This indicates the page size that the host controller
139 * supports. If bit n is set, the HC supports a page size
140 * of 2^(n+12), up to a 128MB page size.
141 * 4K is the minimum page size.
142 * @cmd_ring: CRP - 64-bit Command Ring Pointer
143 * @dcbaa_ptr: DCBAAP - 64-bit Device Context Base Address Array Pointer
144 * @config_reg: CONFIG - Configure Register
145 * @port_status_base: PORTSCn - base address for Port Status and Control
146 * Each port has a Port Status and Control register,
147 * followed by a Port Power Management Status and Control
148 * register, a Port Link Info register, and a reserved
150 * @port_power_base: PORTPMSCn - base address for
151 * Port Power Management Status and Control
152 * @port_link_base: PORTLIn - base address for Port Link Info (current
153 * Link PM state and control) for USB 2.1 and USB 3.0
156 struct xhci_op_regs {
162 u32 dev_notification;
164 /* rsvd: offset 0x20-2F */
168 /* rsvd: offset 0x3C-3FF */
170 /* port 1 registers, which serve as a base address for other ports */
171 u32 port_status_base;
175 /* registers for ports 2-255 */
176 u32 reserved6[NUM_PORT_REGS*254];
177 } __attribute__ ((packed));
179 /* USBCMD - USB command - command bitmasks */
180 /* start/stop HC execution - do not write unless HC is halted*/
181 #define CMD_RUN XHCI_CMD_RUN
182 /* Reset HC - resets internal HC state machine and all registers (except
183 * PCI config regs). HC does NOT drive a USB reset on the downstream ports.
184 * The xHCI driver must reinitialize the xHC after setting this bit.
186 #define CMD_RESET (1 << 1)
187 /* Event Interrupt Enable - a '1' allows interrupts from the host controller */
188 #define CMD_EIE XHCI_CMD_EIE
189 /* Host System Error Interrupt Enable - get out-of-band signal for HC errors */
190 #define CMD_HSEIE XHCI_CMD_HSEIE
191 /* bits 4:6 are reserved (and should be preserved on writes). */
192 /* light reset (port status stays unchanged) - reset completed when this is 0 */
193 #define CMD_LRESET (1 << 7)
194 /* FIXME: ignoring host controller save/restore state for now. */
195 #define CMD_CSS (1 << 8)
196 #define CMD_CRS (1 << 9)
197 /* Enable Wrap Event - '1' means xHC generates an event when MFINDEX wraps. */
198 #define CMD_EWE XHCI_CMD_EWE
199 /* MFINDEX power management - '1' means xHC can stop MFINDEX counter if all root
200 * hubs are in U3 (selective suspend), disconnect, disabled, or powered-off.
201 * '0' means the xHC can power it off if all ports are in the disconnect,
202 * disabled, or powered-off state.
204 #define CMD_PM_INDEX (1 << 11)
205 /* bits 12:31 are reserved (and should be preserved on writes). */
207 /* USBSTS - USB status - status bitmasks */
208 /* HC not running - set to 1 when run/stop bit is cleared. */
209 #define STS_HALT XHCI_STS_HALT
210 /* serious error, e.g. PCI parity error. The HC will clear the run/stop bit. */
211 #define STS_FATAL (1 << 2)
212 /* event interrupt - clear this prior to clearing any IP flags in IR set*/
213 #define STS_EINT (1 << 3)
214 /* port change detect */
215 #define STS_PORT (1 << 4)
216 /* bits 5:7 reserved and zeroed */
217 /* save state status - '1' means xHC is saving state */
218 #define STS_SAVE (1 << 8)
219 /* restore state status - '1' means xHC is restoring state */
220 #define STS_RESTORE (1 << 9)
221 /* true: save or restore error */
222 #define STS_SRE (1 << 10)
223 /* true: Controller Not Ready to accept doorbell or op reg writes after reset */
224 #define STS_CNR XHCI_STS_CNR
225 /* true: internal Host Controller Error - SW needs to reset and reinitialize */
226 #define STS_HCE (1 << 12)
227 /* bits 13:31 reserved and should be preserved */
230 * DNCTRL - Device Notification Control Register - dev_notification bitmasks
231 * Generate a device notification event when the HC sees a transaction with a
232 * notification type that matches a bit set in this bit field.
234 #define DEV_NOTE_MASK (0xffff)
235 #define ENABLE_DEV_NOTE(x) (1 << x)
236 /* Most of the device notification types should only be used for debug.
237 * SW does need to pay attention to function wake notifications.
239 #define DEV_NOTE_FWAKE ENABLE_DEV_NOTE(1)
241 /* CONFIG - Configure Register - config_reg bitmasks */
242 /* bits 0:7 - maximum number of device slots enabled (NumSlotsEn) */
243 #define MAX_DEVS(p) ((p) & 0xff)
244 /* bits 8:31 - reserved and should be preserved */
246 /* PORTSC - Port Status and Control Register - port_status_base bitmasks */
247 /* true: device connected */
248 #define PORT_CONNECT (1 << 0)
249 /* true: port enabled */
250 #define PORT_PE (1 << 1)
251 /* bit 2 reserved and zeroed */
252 /* true: port has an over-current condition */
253 #define PORT_OC (1 << 3)
254 /* true: port reset signaling asserted */
255 #define PORT_RESET (1 << 4)
256 /* Port Link State - bits 5:8
257 * A read gives the current link PM state of the port,
258 * a write with Link State Write Strobe set sets the link state.
260 /* true: port has power (see HCC_PPC) */
261 #define PORT_POWER (1 << 9)
262 /* bits 10:13 indicate device speed:
263 * 0 - undefined speed - port hasn't be initialized by a reset yet
270 #define DEV_SPEED_MASK (0xf<<10)
271 #define DEV_UNDEFSPEED(p) (((p) & DEV_SPEED_MASK) == (0x0<<10))
272 #define DEV_FULLSPEED(p) (((p) & DEV_SPEED_MASK) == (0x1<<10))
273 #define DEV_LOWSPEED(p) (((p) & DEV_SPEED_MASK) == (0x2<<10))
274 #define DEV_HIGHSPEED(p) (((p) & DEV_SPEED_MASK) == (0x3<<10))
275 #define DEV_SUPERSPEED(p) (((p) & DEV_SPEED_MASK) == (0x4<<10))
276 /* Port Indicator Control */
277 #define PORT_LED_OFF (0 << 14)
278 #define PORT_LED_AMBER (1 << 14)
279 #define PORT_LED_GREEN (2 << 14)
280 #define PORT_LED_MASK (3 << 14)
281 /* Port Link State Write Strobe - set this when changing link state */
282 #define PORT_LINK_STROBE (1 << 16)
283 /* true: connect status change */
284 #define PORT_CSC (1 << 17)
285 /* true: port enable change */
286 #define PORT_PEC (1 << 18)
287 /* true: warm reset for a USB 3.0 device is done. A "hot" reset puts the port
288 * into an enabled state, and the device into the default state. A "warm" reset
289 * also resets the link, forcing the device through the link training sequence.
290 * SW can also look at the Port Reset register to see when warm reset is done.
292 #define PORT_WRC (1 << 19)
293 /* true: over-current change */
294 #define PORT_OCC (1 << 20)
295 /* true: reset change - 1 to 0 transition of PORT_RESET */
296 #define PORT_RC (1 << 21)
297 /* port link status change - set on some port link state transitions:
299 * ------------------------------------------------------------------------------
300 * - U3 to Resume Wakeup signaling from a device
301 * - Resume to Recovery to U0 USB 3.0 device resume
302 * - Resume to U0 USB 2.0 device resume
303 * - U3 to Recovery to U0 Software resume of USB 3.0 device complete
304 * - U3 to U0 Software resume of USB 2.0 device complete
305 * - U2 to U0 L1 resume of USB 2.1 device complete
306 * - U0 to U0 (???) L1 entry rejection by USB 2.1 device
307 * - U0 to disabled L1 entry error with USB 2.1 device
308 * - Any state to inactive Error on USB 3.0 port
310 #define PORT_PLC (1 << 22)
311 /* port configure error change - port failed to configure its link partner */
312 #define PORT_CEC (1 << 23)
313 /* bit 24 reserved */
314 /* wake on connect (enable) */
315 #define PORT_WKCONN_E (1 << 25)
316 /* wake on disconnect (enable) */
317 #define PORT_WKDISC_E (1 << 26)
318 /* wake on over-current (enable) */
319 #define PORT_WKOC_E (1 << 27)
320 /* bits 28:29 reserved */
321 /* true: device is removable - for USB 3.0 roothub emulation */
322 #define PORT_DEV_REMOVE (1 << 30)
323 /* Initiate a warm port reset - complete when PORT_WRC is '1' */
324 #define PORT_WR (1 << 31)
326 /* Port Power Management Status and Control - port_power_base bitmasks */
327 /* Inactivity timer value for transitions into U1, in microseconds.
328 * Timeout can be up to 127us. 0xFF means an infinite timeout.
330 #define PORT_U1_TIMEOUT(p) ((p) & 0xff)
331 /* Inactivity timer value for transitions into U2 */
332 #define PORT_U2_TIMEOUT(p) (((p) & 0xff) << 8)
333 /* Bits 24:31 for port testing */
337 * struct intr_reg - Interrupt Register Set
338 * @irq_pending: IMAN - Interrupt Management Register. Used to enable
339 * interrupts and check for pending interrupts.
340 * @irq_control: IMOD - Interrupt Moderation Register.
341 * Used to throttle interrupts.
342 * @erst_size: Number of segments in the Event Ring Segment Table (ERST).
343 * @erst_base: ERST base address.
344 * @erst_dequeue: Event ring dequeue pointer.
346 * Each interrupter (defined by a MSI-X vector) has an event ring and an Event
347 * Ring Segment Table (ERST) associated with it. The event ring is comprised of
348 * multiple segments of the same size. The HC places events on the ring and
349 * "updates the Cycle bit in the TRBs to indicate to software the current
350 * position of the Enqueue Pointer." The HCD (Linux) processes those events and
351 * updates the dequeue pointer.
360 } __attribute__ ((packed));
362 #define ER_IRQ_PENDING(p) ((p) & 0x1)
363 #define ER_IRQ_ENABLE(p) ((p) | 0x2)
364 /* Preserve bits 16:31 of erst_size */
365 #define ERST_SIZE_MASK (0xffff<<16)
368 * struct xhci_run_regs
370 * MFINDEX - current microframe number
372 * Section 5.5 Host Controller Runtime Registers:
373 * "Software should read and write these registers using only Dword (32 bit)
374 * or larger accesses"
376 struct xhci_run_regs {
377 u32 microframe_index;
379 struct intr_reg ir_set[128];
380 } __attribute__ ((packed));
383 /* There is one ehci_hci structure per controller */
385 /* glue to PCI and HCD framework */
386 struct xhci_cap_regs __iomem *cap_regs;
387 struct xhci_op_regs __iomem *op_regs;
388 struct xhci_run_regs __iomem *run_regs;
390 /* Cached register copies of read-only HC data */
398 /* packed release number */
410 /* convert between an HCD pointer and the corresponding EHCI_HCD */
411 static inline struct xhci_hcd *hcd_to_xhci(struct usb_hcd *hcd)
413 return (struct xhci_hcd *) (hcd->hcd_priv);
416 static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci)
418 return container_of((void *) xhci, struct usb_hcd, hcd_priv);
421 #ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
427 #define xhci_dbg(xhci, fmt, args...) \
428 do { if (XHCI_DEBUG) dev_dbg(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
429 #define xhci_info(xhci, fmt, args...) \
430 do { if (XHCI_DEBUG) dev_info(xhci_to_hcd(xhci)->self.controller , fmt , ## args); } while (0)
431 #define xhci_err(xhci, fmt, args...) \
432 dev_err(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
433 #define xhci_warn(xhci, fmt, args...) \
434 dev_warn(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
436 /* TODO: copied from ehci.h - can be refactored? */
437 /* xHCI spec says all registers are little endian */
438 static inline unsigned int xhci_readl(const struct xhci_hcd *xhci,
443 static inline void xhci_writel(const struct xhci_hcd *xhci,
444 const unsigned int val, __u32 __iomem *regs)
447 xhci_dbg(xhci, "`MEM_WRITE_DWORD(3'b000, 32'h%0x, 32'h%0x, 4'hf);\n",
448 (unsigned int) regs, val);
452 #endif /* __LINUX_XHCI_HCD_H */