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xhci.c
3367 lines (2921 loc) · 87.1 KB
/
xhci.c
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/*
* Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <byteswap.h>
#include <ipxe/malloc.h>
#include <ipxe/umalloc.h>
#include <ipxe/pci.h>
#include <ipxe/usb.h>
#include <ipxe/init.h>
#include <ipxe/profile.h>
#include "xhci.h"
/** @file
*
* USB eXtensible Host Controller Interface (xHCI) driver
*
*/
/** Message transfer profiler */
static struct profiler xhci_message_profiler __profiler =
{ .name = "xhci.message" };
/** Stream transfer profiler */
static struct profiler xhci_stream_profiler __profiler =
{ .name = "xhci.stream" };
/** Event ring profiler */
static struct profiler xhci_event_profiler __profiler =
{ .name = "xhci.event" };
/** Transfer event profiler */
static struct profiler xhci_transfer_profiler __profiler =
{ .name = "xhci.transfer" };
/* Disambiguate the various error causes */
#define EIO_DATA \
__einfo_error ( EINFO_EIO_DATA )
#define EINFO_EIO_DATA \
__einfo_uniqify ( EINFO_EIO, ( 2 - 0 ), \
"Data buffer error" )
#define EIO_BABBLE \
__einfo_error ( EINFO_EIO_BABBLE )
#define EINFO_EIO_BABBLE \
__einfo_uniqify ( EINFO_EIO, ( 3 - 0 ), \
"Babble detected" )
#define EIO_USB \
__einfo_error ( EINFO_EIO_USB )
#define EINFO_EIO_USB \
__einfo_uniqify ( EINFO_EIO, ( 4 - 0 ), \
"USB transaction error" )
#define EIO_TRB \
__einfo_error ( EINFO_EIO_TRB )
#define EINFO_EIO_TRB \
__einfo_uniqify ( EINFO_EIO, ( 5 - 0 ), \
"TRB error" )
#define EIO_STALL \
__einfo_error ( EINFO_EIO_STALL )
#define EINFO_EIO_STALL \
__einfo_uniqify ( EINFO_EIO, ( 6 - 0 ), \
"Stall error" )
#define EIO_RESOURCE \
__einfo_error ( EINFO_EIO_RESOURCE )
#define EINFO_EIO_RESOURCE \
__einfo_uniqify ( EINFO_EIO, ( 7 - 0 ), \
"Resource error" )
#define EIO_BANDWIDTH \
__einfo_error ( EINFO_EIO_BANDWIDTH )
#define EINFO_EIO_BANDWIDTH \
__einfo_uniqify ( EINFO_EIO, ( 8 - 0 ), \
"Bandwidth error" )
#define EIO_NO_SLOTS \
__einfo_error ( EINFO_EIO_NO_SLOTS )
#define EINFO_EIO_NO_SLOTS \
__einfo_uniqify ( EINFO_EIO, ( 9 - 0 ), \
"No slots available" )
#define EIO_STREAM_TYPE \
__einfo_error ( EINFO_EIO_STREAM_TYPE )
#define EINFO_EIO_STREAM_TYPE \
__einfo_uniqify ( EINFO_EIO, ( 10 - 0 ), \
"Invalid stream type" )
#define EIO_SLOT \
__einfo_error ( EINFO_EIO_SLOT )
#define EINFO_EIO_SLOT \
__einfo_uniqify ( EINFO_EIO, ( 11 - 0 ), \
"Slot not enabled" )
#define EIO_ENDPOINT \
__einfo_error ( EINFO_EIO_ENDPOINT )
#define EINFO_EIO_ENDPOINT \
__einfo_uniqify ( EINFO_EIO, ( 12 - 0 ), \
"Endpoint not enabled" )
#define EIO_SHORT \
__einfo_error ( EINFO_EIO_SHORT )
#define EINFO_EIO_SHORT \
__einfo_uniqify ( EINFO_EIO, ( 13 - 0 ), \
"Short packet" )
#define EIO_UNDERRUN \
__einfo_error ( EINFO_EIO_UNDERRUN )
#define EINFO_EIO_UNDERRUN \
__einfo_uniqify ( EINFO_EIO, ( 14 - 0 ), \
"Ring underrun" )
#define EIO_OVERRUN \
__einfo_error ( EINFO_EIO_OVERRUN )
#define EINFO_EIO_OVERRUN \
__einfo_uniqify ( EINFO_EIO, ( 15 - 0 ), \
"Ring overrun" )
#define EIO_VF_RING_FULL \
__einfo_error ( EINFO_EIO_VF_RING_FULL )
#define EINFO_EIO_VF_RING_FULL \
__einfo_uniqify ( EINFO_EIO, ( 16 - 0 ), \
"Virtual function event ring full" )
#define EIO_PARAMETER \
__einfo_error ( EINFO_EIO_PARAMETER )
#define EINFO_EIO_PARAMETER \
__einfo_uniqify ( EINFO_EIO, ( 17 - 0 ), \
"Parameter error" )
#define EIO_BANDWIDTH_OVERRUN \
__einfo_error ( EINFO_EIO_BANDWIDTH_OVERRUN )
#define EINFO_EIO_BANDWIDTH_OVERRUN \
__einfo_uniqify ( EINFO_EIO, ( 18 - 0 ), \
"Bandwidth overrun" )
#define EIO_CONTEXT \
__einfo_error ( EINFO_EIO_CONTEXT )
#define EINFO_EIO_CONTEXT \
__einfo_uniqify ( EINFO_EIO, ( 19 - 0 ), \
"Context state error" )
#define EIO_NO_PING \
__einfo_error ( EINFO_EIO_NO_PING )
#define EINFO_EIO_NO_PING \
__einfo_uniqify ( EINFO_EIO, ( 20 - 0 ), \
"No ping response" )
#define EIO_RING_FULL \
__einfo_error ( EINFO_EIO_RING_FULL )
#define EINFO_EIO_RING_FULL \
__einfo_uniqify ( EINFO_EIO, ( 21 - 0 ), \
"Event ring full" )
#define EIO_INCOMPATIBLE \
__einfo_error ( EINFO_EIO_INCOMPATIBLE )
#define EINFO_EIO_INCOMPATIBLE \
__einfo_uniqify ( EINFO_EIO, ( 22 - 0 ), \
"Incompatible device" )
#define EIO_MISSED \
__einfo_error ( EINFO_EIO_MISSED )
#define EINFO_EIO_MISSED \
__einfo_uniqify ( EINFO_EIO, ( 23 - 0 ), \
"Missed service error" )
#define EIO_CMD_STOPPED \
__einfo_error ( EINFO_EIO_CMD_STOPPED )
#define EINFO_EIO_CMD_STOPPED \
__einfo_uniqify ( EINFO_EIO, ( 24 - 0 ), \
"Command ring stopped" )
#define EIO_CMD_ABORTED \
__einfo_error ( EINFO_EIO_CMD_ABORTED )
#define EINFO_EIO_CMD_ABORTED \
__einfo_uniqify ( EINFO_EIO, ( 25 - 0 ), \
"Command aborted" )
#define EIO_STOP \
__einfo_error ( EINFO_EIO_STOP )
#define EINFO_EIO_STOP \
__einfo_uniqify ( EINFO_EIO, ( 26 - 0 ), \
"Stopped" )
#define EIO_STOP_LEN \
__einfo_error ( EINFO_EIO_STOP_LEN )
#define EINFO_EIO_STOP_LEN \
__einfo_uniqify ( EINFO_EIO, ( 27 - 0 ), \
"Stopped - length invalid" )
#define EIO_STOP_SHORT \
__einfo_error ( EINFO_EIO_STOP_SHORT )
#define EINFO_EIO_STOP_SHORT \
__einfo_uniqify ( EINFO_EIO, ( 28 - 0 ), \
"Stopped - short packet" )
#define EIO_LATENCY \
__einfo_error ( EINFO_EIO_LATENCY )
#define EINFO_EIO_LATENCY \
__einfo_uniqify ( EINFO_EIO, ( 29 - 0 ), \
"Maximum exit latency too large" )
#define EIO_ISOCH \
__einfo_error ( EINFO_EIO_ISOCH )
#define EINFO_EIO_ISOCH \
__einfo_uniqify ( EINFO_EIO, ( 31 - 0 ), \
"Isochronous buffer overrun" )
#define EPROTO_LOST \
__einfo_error ( EINFO_EPROTO_LOST )
#define EINFO_EPROTO_LOST \
__einfo_uniqify ( EINFO_EPROTO, ( 32 - 32 ), \
"Event lost" )
#define EPROTO_UNDEFINED \
__einfo_error ( EINFO_EPROTO_UNDEFINED )
#define EINFO_EPROTO_UNDEFINED \
__einfo_uniqify ( EINFO_EPROTO, ( 33 - 32 ), \
"Undefined error" )
#define EPROTO_STREAM_ID \
__einfo_error ( EINFO_EPROTO_STREAM_ID )
#define EINFO_EPROTO_STREAM_ID \
__einfo_uniqify ( EINFO_EPROTO, ( 34 - 32 ), \
"Invalid stream ID" )
#define EPROTO_SECONDARY \
__einfo_error ( EINFO_EPROTO_SECONDARY )
#define EINFO_EPROTO_SECONDARY \
__einfo_uniqify ( EINFO_EPROTO, ( 35 - 32 ), \
"Secondary bandwidth error" )
#define EPROTO_SPLIT \
__einfo_error ( EINFO_EPROTO_SPLIT )
#define EINFO_EPROTO_SPLIT \
__einfo_uniqify ( EINFO_EPROTO, ( 36 - 32 ), \
"Split transaction error" )
#define ECODE(code) \
( ( (code) < 32 ) ? \
EUNIQ ( EINFO_EIO, ( (code) & 31 ), EIO_DATA, EIO_BABBLE, \
EIO_USB, EIO_TRB, EIO_STALL, EIO_RESOURCE, \
EIO_BANDWIDTH, EIO_NO_SLOTS, EIO_STREAM_TYPE, \
EIO_SLOT, EIO_ENDPOINT, EIO_SHORT, EIO_UNDERRUN, \
EIO_OVERRUN, EIO_VF_RING_FULL, EIO_PARAMETER, \
EIO_BANDWIDTH_OVERRUN, EIO_CONTEXT, EIO_NO_PING, \
EIO_RING_FULL, EIO_INCOMPATIBLE, EIO_MISSED, \
EIO_CMD_STOPPED, EIO_CMD_ABORTED, EIO_STOP, \
EIO_STOP_LEN, EIO_STOP_SHORT, EIO_LATENCY, \
EIO_ISOCH ) : \
( (code) < 64 ) ? \
EUNIQ ( EINFO_EPROTO, ( (code) & 31 ), EPROTO_LOST, \
EPROTO_UNDEFINED, EPROTO_STREAM_ID, \
EPROTO_SECONDARY, EPROTO_SPLIT ) : \
EFAULT )
/******************************************************************************
*
* Register access
*
******************************************************************************
*/
/**
* Initialise device
*
* @v xhci xHCI device
* @v regs MMIO registers
*/
static void xhci_init ( struct xhci_device *xhci, void *regs ) {
uint32_t hcsparams1;
uint32_t hcsparams2;
uint32_t hccparams1;
uint32_t pagesize;
size_t caplength;
size_t rtsoff;
size_t dboff;
/* Locate capability, operational, runtime, and doorbell registers */
xhci->cap = regs;
caplength = readb ( xhci->cap + XHCI_CAP_CAPLENGTH );
rtsoff = readl ( xhci->cap + XHCI_CAP_RTSOFF );
dboff = readl ( xhci->cap + XHCI_CAP_DBOFF );
xhci->op = ( xhci->cap + caplength );
xhci->run = ( xhci->cap + rtsoff );
xhci->db = ( xhci->cap + dboff );
DBGC2 ( xhci, "XHCI %s cap %08lx op %08lx run %08lx db %08lx\n",
xhci->name, virt_to_phys ( xhci->cap ),
virt_to_phys ( xhci->op ), virt_to_phys ( xhci->run ),
virt_to_phys ( xhci->db ) );
/* Read structural parameters 1 */
hcsparams1 = readl ( xhci->cap + XHCI_CAP_HCSPARAMS1 );
xhci->slots = XHCI_HCSPARAMS1_SLOTS ( hcsparams1 );
xhci->intrs = XHCI_HCSPARAMS1_INTRS ( hcsparams1 );
xhci->ports = XHCI_HCSPARAMS1_PORTS ( hcsparams1 );
DBGC ( xhci, "XHCI %s has %d slots %d intrs %d ports\n",
xhci->name, xhci->slots, xhci->intrs, xhci->ports );
/* Read structural parameters 2 */
hcsparams2 = readl ( xhci->cap + XHCI_CAP_HCSPARAMS2 );
xhci->scratchpads = XHCI_HCSPARAMS2_SCRATCHPADS ( hcsparams2 );
DBGC2 ( xhci, "XHCI %s needs %d scratchpads\n",
xhci->name, xhci->scratchpads );
/* Read capability parameters 1 */
hccparams1 = readl ( xhci->cap + XHCI_CAP_HCCPARAMS1 );
xhci->addr64 = XHCI_HCCPARAMS1_ADDR64 ( hccparams1 );
xhci->csz_shift = XHCI_HCCPARAMS1_CSZ_SHIFT ( hccparams1 );
xhci->xecp = XHCI_HCCPARAMS1_XECP ( hccparams1 );
/* Read page size */
pagesize = readl ( xhci->op + XHCI_OP_PAGESIZE );
xhci->pagesize = XHCI_PAGESIZE ( pagesize );
assert ( xhci->pagesize != 0 );
assert ( ( ( xhci->pagesize ) & ( xhci->pagesize - 1 ) ) == 0 );
DBGC2 ( xhci, "XHCI %s page size %zd bytes\n",
xhci->name, xhci->pagesize );
}
/**
* Find extended capability
*
* @v xhci xHCI device
* @v id Capability ID
* @v offset Offset to previous extended capability instance, or zero
* @ret offset Offset to extended capability, or zero if not found
*/
static unsigned int xhci_extended_capability ( struct xhci_device *xhci,
unsigned int id,
unsigned int offset ) {
uint32_t xecp;
unsigned int next;
/* Locate the extended capability */
while ( 1 ) {
/* Locate first or next capability as applicable */
if ( offset ) {
xecp = readl ( xhci->cap + offset );
next = XHCI_XECP_NEXT ( xecp );
} else {
next = xhci->xecp;
}
if ( ! next )
return 0;
offset += next;
/* Check if this is the requested capability */
xecp = readl ( xhci->cap + offset );
if ( XHCI_XECP_ID ( xecp ) == id )
return offset;
}
}
/**
* Write potentially 64-bit register
*
* @v xhci xHCI device
* @v value Value
* @v reg Register address
* @ret rc Return status code
*/
static inline __attribute__ (( always_inline )) int
xhci_writeq ( struct xhci_device *xhci, physaddr_t value, void *reg ) {
/* If this is a 32-bit build, then this can never fail
* (allowing the compiler to optimise out the error path).
*/
if ( sizeof ( value ) <= sizeof ( uint32_t ) ) {
writel ( value, reg );
writel ( 0, ( reg + sizeof ( uint32_t ) ) );
return 0;
}
/* If the device does not support 64-bit addresses and this
* address is outside the 32-bit address space, then fail.
*/
if ( ( value & ~0xffffffffULL ) && ! xhci->addr64 ) {
DBGC ( xhci, "XHCI %s cannot access address %lx\n",
xhci->name, value );
return -ENOTSUP;
}
/* If this is a 64-bit build, then writeq() is available */
writeq ( value, reg );
return 0;
}
/**
* Calculate buffer alignment
*
* @v len Length
* @ret align Buffer alignment
*
* Determine alignment required for a buffer which must be aligned to
* at least XHCI_MIN_ALIGN and which must not cross a page boundary.
*/
static inline size_t xhci_align ( size_t len ) {
size_t align;
/* Align to own length (rounded up to a power of two) */
align = ( 1 << fls ( len - 1 ) );
/* Round up to XHCI_MIN_ALIGN if needed */
if ( align < XHCI_MIN_ALIGN )
align = XHCI_MIN_ALIGN;
return align;
}
/**
* Calculate device context offset
*
* @v xhci xHCI device
* @v ctx Context index
*/
static inline size_t xhci_device_context_offset ( struct xhci_device *xhci,
unsigned int ctx ) {
return ( XHCI_DCI ( ctx ) << xhci->csz_shift );
}
/**
* Calculate input context offset
*
* @v xhci xHCI device
* @v ctx Context index
*/
static inline size_t xhci_input_context_offset ( struct xhci_device *xhci,
unsigned int ctx ) {
return ( XHCI_ICI ( ctx ) << xhci->csz_shift );
}
/******************************************************************************
*
* Diagnostics
*
******************************************************************************
*/
/**
* Dump host controller registers
*
* @v xhci xHCI device
*/
static inline void xhci_dump ( struct xhci_device *xhci ) {
uint32_t usbcmd;
uint32_t usbsts;
uint32_t pagesize;
uint32_t dnctrl;
uint32_t config;
/* Do nothing unless debugging is enabled */
if ( ! DBG_LOG )
return;
/* Dump USBCMD */
usbcmd = readl ( xhci->op + XHCI_OP_USBCMD );
DBGC ( xhci, "XHCI %s USBCMD %08x%s%s\n", xhci->name, usbcmd,
( ( usbcmd & XHCI_USBCMD_RUN ) ? " run" : "" ),
( ( usbcmd & XHCI_USBCMD_HCRST ) ? " hcrst" : "" ) );
/* Dump USBSTS */
usbsts = readl ( xhci->op + XHCI_OP_USBSTS );
DBGC ( xhci, "XHCI %s USBSTS %08x%s\n", xhci->name, usbsts,
( ( usbsts & XHCI_USBSTS_HCH ) ? " hch" : "" ) );
/* Dump PAGESIZE */
pagesize = readl ( xhci->op + XHCI_OP_PAGESIZE );
DBGC ( xhci, "XHCI %s PAGESIZE %08x\n", xhci->name, pagesize );
/* Dump DNCTRL */
dnctrl = readl ( xhci->op + XHCI_OP_DNCTRL );
DBGC ( xhci, "XHCI %s DNCTRL %08x\n", xhci->name, dnctrl );
/* Dump CONFIG */
config = readl ( xhci->op + XHCI_OP_CONFIG );
DBGC ( xhci, "XHCI %s CONFIG %08x\n", xhci->name, config );
}
/**
* Dump port registers
*
* @v xhci xHCI device
* @v port Port number
*/
static inline void xhci_dump_port ( struct xhci_device *xhci,
unsigned int port ) {
uint32_t portsc;
uint32_t portpmsc;
uint32_t portli;
uint32_t porthlpmc;
/* Do nothing unless debugging is enabled */
if ( ! DBG_LOG )
return;
/* Dump PORTSC */
portsc = readl ( xhci->op + XHCI_OP_PORTSC ( port ) );
DBGC ( xhci, "XHCI %s-%d PORTSC %08x%s%s%s%s psiv=%d\n",
xhci->name, port, portsc,
( ( portsc & XHCI_PORTSC_CCS ) ? " ccs" : "" ),
( ( portsc & XHCI_PORTSC_PED ) ? " ped" : "" ),
( ( portsc & XHCI_PORTSC_PR ) ? " pr" : "" ),
( ( portsc & XHCI_PORTSC_PP ) ? " pp" : "" ),
XHCI_PORTSC_PSIV ( portsc ) );
/* Dump PORTPMSC */
portpmsc = readl ( xhci->op + XHCI_OP_PORTPMSC ( port ) );
DBGC ( xhci, "XHCI %s-%d PORTPMSC %08x\n", xhci->name, port, portpmsc );
/* Dump PORTLI */
portli = readl ( xhci->op + XHCI_OP_PORTLI ( port ) );
DBGC ( xhci, "XHCI %s-%d PORTLI %08x\n", xhci->name, port, portli );
/* Dump PORTHLPMC */
porthlpmc = readl ( xhci->op + XHCI_OP_PORTHLPMC ( port ) );
DBGC ( xhci, "XHCI %s-%d PORTHLPMC %08x\n",
xhci->name, port, porthlpmc );
}
/******************************************************************************
*
* USB legacy support
*
******************************************************************************
*/
/** Prevent the release of ownership back to BIOS */
static int xhci_legacy_prevent_release;
/**
* Initialise USB legacy support
*
* @v xhci xHCI device
*/
static void xhci_legacy_init ( struct xhci_device *xhci ) {
unsigned int legacy;
uint8_t bios;
/* Locate USB legacy support capability (if present) */
legacy = xhci_extended_capability ( xhci, XHCI_XECP_ID_LEGACY, 0 );
if ( ! legacy ) {
/* Not an error; capability may not be present */
DBGC ( xhci, "XHCI %s has no USB legacy support capability\n",
xhci->name );
return;
}
/* Check if legacy USB support is enabled */
bios = readb ( xhci->cap + legacy + XHCI_USBLEGSUP_BIOS );
if ( ! ( bios & XHCI_USBLEGSUP_BIOS_OWNED ) ) {
/* Not an error; already owned by OS */
DBGC ( xhci, "XHCI %s USB legacy support already disabled\n",
xhci->name );
return;
}
/* Record presence of USB legacy support capability */
xhci->legacy = legacy;
}
/**
* Claim ownership from BIOS
*
* @v xhci xHCI device
*/
static void xhci_legacy_claim ( struct xhci_device *xhci ) {
uint32_t ctlsts;
uint8_t bios;
unsigned int i;
/* Do nothing unless legacy support capability is present */
if ( ! xhci->legacy )
return;
/* Claim ownership */
writeb ( XHCI_USBLEGSUP_OS_OWNED,
xhci->cap + xhci->legacy + XHCI_USBLEGSUP_OS );
/* Wait for BIOS to release ownership */
for ( i = 0 ; i < XHCI_USBLEGSUP_MAX_WAIT_MS ; i++ ) {
/* Check if BIOS has released ownership */
bios = readb ( xhci->cap + xhci->legacy + XHCI_USBLEGSUP_BIOS );
if ( ! ( bios & XHCI_USBLEGSUP_BIOS_OWNED ) ) {
DBGC ( xhci, "XHCI %s claimed ownership from BIOS\n",
xhci->name );
ctlsts = readl ( xhci->cap + xhci->legacy +
XHCI_USBLEGSUP_CTLSTS );
if ( ctlsts ) {
DBGC ( xhci, "XHCI %s warning: BIOS retained "
"SMIs: %08x\n", xhci->name, ctlsts );
}
return;
}
/* Delay */
mdelay ( 1 );
}
/* BIOS did not release ownership. Claim it forcibly by
* disabling all SMIs.
*/
DBGC ( xhci, "XHCI %s could not claim ownership from BIOS: forcibly "
"disabling SMIs\n", xhci->name );
writel ( 0, xhci->cap + xhci->legacy + XHCI_USBLEGSUP_CTLSTS );
}
/**
* Release ownership back to BIOS
*
* @v xhci xHCI device
*/
static void xhci_legacy_release ( struct xhci_device *xhci ) {
/* Do nothing unless legacy support capability is present */
if ( ! xhci->legacy )
return;
/* Do nothing if releasing ownership is prevented */
if ( xhci_legacy_prevent_release ) {
DBGC ( xhci, "XHCI %s not releasing ownership to BIOS\n",
xhci->name );
return;
}
/* Release ownership */
writeb ( 0, xhci->cap + xhci->legacy + XHCI_USBLEGSUP_OS );
DBGC ( xhci, "XHCI %s released ownership to BIOS\n", xhci->name );
}
/******************************************************************************
*
* Supported protocols
*
******************************************************************************
*/
/**
* Transcribe port speed (for debugging)
*
* @v psi Protocol speed ID
* @ret speed Transcribed speed
*/
static inline const char * xhci_speed_name ( uint32_t psi ) {
static const char *exponents[4] = { "", "k", "M", "G" };
static char buf[ 10 /* "xxxxxXbps" + NUL */ ];
unsigned int mantissa;
unsigned int exponent;
/* Extract mantissa and exponent */
mantissa = XHCI_SUPPORTED_PSI_MANTISSA ( psi );
exponent = XHCI_SUPPORTED_PSI_EXPONENT ( psi );
/* Transcribe speed */
snprintf ( buf, sizeof ( buf ), "%d%sbps",
mantissa, exponents[exponent] );
return buf;
}
/**
* Find supported protocol extended capability for a port
*
* @v xhci xHCI device
* @v port Port number
* @ret supported Offset to extended capability, or zero if not found
*/
static unsigned int xhci_supported_protocol ( struct xhci_device *xhci,
unsigned int port ) {
unsigned int supported = 0;
unsigned int offset;
unsigned int count;
uint32_t ports;
/* Iterate over all supported protocol structures */
while ( ( supported = xhci_extended_capability ( xhci,
XHCI_XECP_ID_SUPPORTED,
supported ) ) ) {
/* Determine port range */
ports = readl ( xhci->cap + supported + XHCI_SUPPORTED_PORTS );
offset = XHCI_SUPPORTED_PORTS_OFFSET ( ports );
count = XHCI_SUPPORTED_PORTS_COUNT ( ports );
/* Check if port lies within this range */
if ( ( port - offset ) < count )
return supported;
}
DBGC ( xhci, "XHCI %s-%d has no supported protocol\n",
xhci->name, port );
return 0;
}
/**
* Find port protocol
*
* @v xhci xHCI device
* @v port Port number
* @ret protocol USB protocol, or zero if not found
*/
static unsigned int xhci_port_protocol ( struct xhci_device *xhci,
unsigned int port ) {
unsigned int supported = xhci_supported_protocol ( xhci, port );
union {
uint32_t raw;
char text[5];
} name;
unsigned int protocol;
unsigned int type;
unsigned int psic;
unsigned int psiv;
unsigned int i;
uint32_t revision;
uint32_t ports;
uint32_t slot;
uint32_t psi;
/* Fail if there is no supported protocol */
if ( ! supported )
return 0;
/* Determine protocol version */
revision = readl ( xhci->cap + supported + XHCI_SUPPORTED_REVISION );
protocol = XHCI_SUPPORTED_REVISION_VER ( revision );
/* Describe port protocol */
if ( DBG_EXTRA ) {
name.raw = cpu_to_le32 ( readl ( xhci->cap + supported +
XHCI_SUPPORTED_NAME ) );
name.text[4] = '\0';
slot = readl ( xhci->cap + supported + XHCI_SUPPORTED_SLOT );
type = XHCI_SUPPORTED_SLOT_TYPE ( slot );
DBGC2 ( xhci, "XHCI %s-%d %sv%04x type %d",
xhci->name, port, name.text, protocol, type );
ports = readl ( xhci->cap + supported + XHCI_SUPPORTED_PORTS );
psic = XHCI_SUPPORTED_PORTS_PSIC ( ports );
if ( psic ) {
DBGC2 ( xhci, " speeds" );
for ( i = 0 ; i < psic ; i++ ) {
psi = readl ( xhci->cap + supported +
XHCI_SUPPORTED_PSI ( i ) );
psiv = XHCI_SUPPORTED_PSI_VALUE ( psi );
DBGC2 ( xhci, " %d:%s", psiv,
xhci_speed_name ( psi ) );
}
}
if ( xhci->quirks & XHCI_BAD_PSIV )
DBGC2 ( xhci, " (ignored)" );
DBGC2 ( xhci, "\n" );
}
return protocol;
}
/**
* Find port slot type
*
* @v xhci xHCI device
* @v port Port number
* @ret type Slot type, or negative error
*/
static int xhci_port_slot_type ( struct xhci_device *xhci, unsigned int port ) {
unsigned int supported = xhci_supported_protocol ( xhci, port );
unsigned int type;
uint32_t slot;
/* Fail if there is no supported protocol */
if ( ! supported )
return -ENOTSUP;
/* Get slot type */
slot = readl ( xhci->cap + supported + XHCI_SUPPORTED_SLOT );
type = XHCI_SUPPORTED_SLOT_TYPE ( slot );
return type;
}
/**
* Find port speed
*
* @v xhci xHCI device
* @v port Port number
* @v psiv Protocol speed ID value
* @ret speed Port speed, or negative error
*/
static int xhci_port_speed ( struct xhci_device *xhci, unsigned int port,
unsigned int psiv ) {
unsigned int supported = xhci_supported_protocol ( xhci, port );
unsigned int psic;
unsigned int mantissa;
unsigned int exponent;
unsigned int speed;
unsigned int i;
uint32_t ports;
uint32_t psi;
/* Fail if there is no supported protocol */
if ( ! supported )
return -ENOTSUP;
/* Get protocol speed ID count */
ports = readl ( xhci->cap + supported + XHCI_SUPPORTED_PORTS );
psic = XHCI_SUPPORTED_PORTS_PSIC ( ports );
/* Use protocol speed ID table unless device is known to be faulty */
if ( ! ( xhci->quirks & XHCI_BAD_PSIV ) ) {
/* Iterate over PSI dwords looking for a match */
for ( i = 0 ; i < psic ; i++ ) {
psi = readl ( xhci->cap + supported +
XHCI_SUPPORTED_PSI ( i ) );
if ( psiv == XHCI_SUPPORTED_PSI_VALUE ( psi ) ) {
mantissa = XHCI_SUPPORTED_PSI_MANTISSA ( psi );
exponent = XHCI_SUPPORTED_PSI_EXPONENT ( psi );
speed = USB_SPEED ( mantissa, exponent );
return speed;
}
}
/* Record device as faulty if no match is found */
if ( psic != 0 ) {
DBGC ( xhci, "XHCI %s-%d spurious PSI value %d: "
"assuming PSI table is invalid\n",
xhci->name, port, psiv );
xhci->quirks |= XHCI_BAD_PSIV;
}
}
/* Use the default mappings */
switch ( psiv ) {
case XHCI_SPEED_LOW : return USB_SPEED_LOW;
case XHCI_SPEED_FULL : return USB_SPEED_FULL;
case XHCI_SPEED_HIGH : return USB_SPEED_HIGH;
case XHCI_SPEED_SUPER : return USB_SPEED_SUPER;
default:
DBGC ( xhci, "XHCI %s-%d unrecognised PSI value %d\n",
xhci->name, port, psiv );
return -ENOTSUP;
}
}
/**
* Find protocol speed ID value
*
* @v xhci xHCI device
* @v port Port number
* @v speed USB speed
* @ret psiv Protocol speed ID value, or negative error
*/
static int xhci_port_psiv ( struct xhci_device *xhci, unsigned int port,
unsigned int speed ) {
unsigned int supported = xhci_supported_protocol ( xhci, port );
unsigned int psic;
unsigned int mantissa;
unsigned int exponent;
unsigned int psiv;
unsigned int i;
uint32_t ports;
uint32_t psi;
/* Fail if there is no supported protocol */
if ( ! supported )
return -ENOTSUP;
/* Get protocol speed ID count */
ports = readl ( xhci->cap + supported + XHCI_SUPPORTED_PORTS );
psic = XHCI_SUPPORTED_PORTS_PSIC ( ports );
/* Use the default mappings if applicable */
if ( ( psic == 0 ) || ( xhci->quirks & XHCI_BAD_PSIV ) ) {
switch ( speed ) {
case USB_SPEED_LOW : return XHCI_SPEED_LOW;
case USB_SPEED_FULL : return XHCI_SPEED_FULL;
case USB_SPEED_HIGH : return XHCI_SPEED_HIGH;
case USB_SPEED_SUPER : return XHCI_SPEED_SUPER;
default:
DBGC ( xhci, "XHCI %s-%d non-standard speed %d\n",
xhci->name, port, speed );
return -ENOTSUP;
}
}
/* Iterate over PSI dwords looking for a match */
for ( i = 0 ; i < psic ; i++ ) {
psi = readl ( xhci->cap + supported + XHCI_SUPPORTED_PSI ( i ));
mantissa = XHCI_SUPPORTED_PSI_MANTISSA ( psi );
exponent = XHCI_SUPPORTED_PSI_EXPONENT ( psi );
if ( speed == USB_SPEED ( mantissa, exponent ) ) {
psiv = XHCI_SUPPORTED_PSI_VALUE ( psi );
return psiv;
}
}
DBGC ( xhci, "XHCI %s-%d unrepresentable speed %#x\n",
xhci->name, port, speed );
return -ENOENT;
}
/******************************************************************************
*
* Device context base address array
*
******************************************************************************
*/
/**
* Allocate device context base address array
*
* @v xhci xHCI device
* @ret rc Return status code
*/
static int xhci_dcbaa_alloc ( struct xhci_device *xhci ) {
size_t len;
physaddr_t dcbaap;
int rc;
/* Allocate and initialise structure. Must be at least
* 64-byte aligned and must not cross a page boundary, so
* align on its own size (rounded up to a power of two and
* with a minimum of 64 bytes).
*/
len = ( ( xhci->slots + 1 ) * sizeof ( xhci->dcbaa[0] ) );
xhci->dcbaa = malloc_dma ( len, xhci_align ( len ) );
if ( ! xhci->dcbaa ) {
DBGC ( xhci, "XHCI %s could not allocate DCBAA\n", xhci->name );
rc = -ENOMEM;
goto err_alloc;
}
memset ( xhci->dcbaa, 0, len );
/* Program DCBAA pointer */
dcbaap = virt_to_phys ( xhci->dcbaa );
if ( ( rc = xhci_writeq ( xhci, dcbaap,
xhci->op + XHCI_OP_DCBAAP ) ) != 0 )
goto err_writeq;
DBGC2 ( xhci, "XHCI %s DCBAA at [%08lx,%08lx)\n",
xhci->name, dcbaap, ( dcbaap + len ) );
return 0;
err_writeq:
free_dma ( xhci->dcbaa, len );
err_alloc:
return rc;
}
/**
* Free device context base address array
*
* @v xhci xHCI device
*/
static void xhci_dcbaa_free ( struct xhci_device *xhci ) {
size_t len;
unsigned int i;
/* Sanity check */
for ( i = 0 ; i <= xhci->slots ; i++ )
assert ( xhci->dcbaa[i] == 0 );
/* Clear DCBAA pointer */
xhci_writeq ( xhci, 0, xhci->op + XHCI_OP_DCBAAP );
/* Free DCBAA */
len = ( ( xhci->slots + 1 ) * sizeof ( xhci->dcbaa[0] ) );
free_dma ( xhci->dcbaa, len );
}
/******************************************************************************
*
* Scratchpad buffers
*
******************************************************************************
*/
/**
* Allocate scratchpad buffers
*
* @v xhci xHCI device
* @ret rc Return status code
*/
static int xhci_scratchpad_alloc ( struct xhci_device *xhci ) {
size_t array_len;
size_t len;
physaddr_t phys;
unsigned int i;
int rc;
/* Do nothing if no scratchpad buffers are used */
if ( ! xhci->scratchpads )
return 0;
/* Allocate scratchpads */
len = ( xhci->scratchpads * xhci->pagesize );
xhci->scratchpad = umalloc ( len );
if ( ! xhci->scratchpad ) {
DBGC ( xhci, "XHCI %s could not allocate scratchpad buffers\n",
xhci->name );
rc = -ENOMEM;
goto err_alloc;
}
memset_user ( xhci->scratchpad, 0, 0, len );