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ipxe/src/drivers/usb/ehci.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 <unistd.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <byteswap.h>
#include <ipxe/malloc.h>
#include <ipxe/pci.h>
#include <ipxe/usb.h>
#include <ipxe/init.h>
#include "ehci.h"
/** @file
*
* USB Enhanced Host Controller Interface (EHCI) driver
*
*/
/**
* Construct error code from transfer descriptor status
*
* @v status Transfer descriptor status
* @ret rc Error code
*
* Bits 2-5 of the status code provide some indication as to the root
* cause of the error. We incorporate these into the error code as
* reported to usb_complete_err().
*/
#define EIO_STATUS( status ) EUNIQ ( EINFO_EIO, ( ( (status) >> 2 ) & 0xf ) )
/******************************************************************************
*
* Register access
*
******************************************************************************
*/
/**
* Initialise device
*
* @v ehci EHCI device
* @v regs MMIO registers
*/
static void ehci_init ( struct ehci_device *ehci, void *regs ) {
uint32_t hcsparams;
uint32_t hccparams;
size_t caplength;
/* Locate capability and operational registers */
ehci->cap = regs;
caplength = readb ( ehci->cap + EHCI_CAP_CAPLENGTH );
ehci->op = ( ehci->cap + caplength );
DBGC2 ( ehci, "EHCI %s cap %08lx op %08lx\n", ehci->name,
virt_to_phys ( ehci->cap ), virt_to_phys ( ehci->op ) );
/* Read structural parameters */
hcsparams = readl ( ehci->cap + EHCI_CAP_HCSPARAMS );
ehci->ports = EHCI_HCSPARAMS_PORTS ( hcsparams );
DBGC ( ehci, "EHCI %s has %d ports\n", ehci->name, ehci->ports );
/* Read capability parameters 1 */
hccparams = readl ( ehci->cap + EHCI_CAP_HCCPARAMS );
ehci->addr64 = EHCI_HCCPARAMS_ADDR64 ( hccparams );
ehci->flsize = ( EHCI_HCCPARAMS_FLSIZE ( hccparams ) ?
EHCI_FLSIZE_SMALL : EHCI_FLSIZE_DEFAULT );
ehci->eecp = EHCI_HCCPARAMS_EECP ( hccparams );
DBGC2 ( ehci, "EHCI %s %d-bit flsize %d\n", ehci->name,
( ehci->addr64 ? 64 : 32 ), ehci->flsize );
}
/**
* Find extended capability
*
* @v ehci EHCI device
* @v pci PCI 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 ehci_extended_capability ( struct ehci_device *ehci,
struct pci_device *pci,
unsigned int id,
unsigned int offset ) {
uint32_t eecp;
/* Locate the extended capability */
while ( 1 ) {
/* Locate first or next capability as applicable */
if ( offset ) {
pci_read_config_dword ( pci, offset, &eecp );
offset = EHCI_EECP_NEXT ( eecp );
} else {
offset = ehci->eecp;
}
if ( ! offset )
return 0;
/* Check if this is the requested capability */
pci_read_config_dword ( pci, offset, &eecp );
if ( EHCI_EECP_ID ( eecp ) == id )
return offset;
}
}
/**
* Calculate buffer alignment
*
* @v len Length
* @ret align Buffer alignment
*
* Determine alignment required for a buffer which must be aligned to
* at least EHCI_MIN_ALIGN and which must not cross a page boundary.
*/
static inline size_t ehci_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 EHCI_MIN_ALIGN if needed */
if ( align < EHCI_MIN_ALIGN )
align = EHCI_MIN_ALIGN;
return align;
}
/**
* Check control data structure reachability
*
* @v ehci EHCI device
* @v ptr Data structure pointer
* @ret rc Return status code
*/
static int ehci_ctrl_reachable ( struct ehci_device *ehci, void *ptr ) {
physaddr_t phys = virt_to_phys ( ptr );
uint32_t segment;
/* Always reachable in a 32-bit build */
if ( sizeof ( physaddr_t ) <= sizeof ( uint32_t ) )
return 0;
/* Reachable only if control segment matches in a 64-bit build */
segment = ( ( ( uint64_t ) phys ) >> 32 );
if ( segment == ehci->ctrldssegment )
return 0;
return -ENOTSUP;
}
/******************************************************************************
*
* Diagnostics
*
******************************************************************************
*/
/**
* Dump host controller registers
*
* @v ehci EHCI device
*/
static __unused void ehci_dump ( struct ehci_device *ehci ) {
uint8_t caplength;
uint16_t hciversion;
uint32_t hcsparams;
uint32_t hccparams;
uint32_t usbcmd;
uint32_t usbsts;
uint32_t usbintr;
uint32_t frindex;
uint32_t ctrldssegment;
uint32_t periodiclistbase;
uint32_t asynclistaddr;
uint32_t configflag;
/* Do nothing unless debugging is enabled */
if ( ! DBG_LOG )
return;
/* Dump capability registers */
caplength = readb ( ehci->cap + EHCI_CAP_CAPLENGTH );
hciversion = readw ( ehci->cap + EHCI_CAP_HCIVERSION );
hcsparams = readl ( ehci->cap + EHCI_CAP_HCSPARAMS );
hccparams = readl ( ehci->cap + EHCI_CAP_HCCPARAMS );
DBGC ( ehci, "EHCI %s caplen %02x hciversion %04x hcsparams %08x "
"hccparams %08x\n", ehci->name, caplength, hciversion,
hcsparams, hccparams );
/* Dump operational registers */
usbcmd = readl ( ehci->op + EHCI_OP_USBCMD );
usbsts = readl ( ehci->op + EHCI_OP_USBSTS );
usbintr = readl ( ehci->op + EHCI_OP_USBINTR );
frindex = readl ( ehci->op + EHCI_OP_FRINDEX );
ctrldssegment = readl ( ehci->op + EHCI_OP_CTRLDSSEGMENT );
periodiclistbase = readl ( ehci->op + EHCI_OP_PERIODICLISTBASE );
asynclistaddr = readl ( ehci->op + EHCI_OP_ASYNCLISTADDR );
configflag = readl ( ehci->op + EHCI_OP_CONFIGFLAG );
DBGC ( ehci, "EHCI %s usbcmd %08x usbsts %08x usbint %08x frindx "
"%08x\n", ehci->name, usbcmd, usbsts, usbintr, frindex );
DBGC ( ehci, "EHCI %s ctrlds %08x period %08x asyncl %08x cfgflg "
"%08x\n", ehci->name, ctrldssegment, periodiclistbase,
asynclistaddr, configflag );
}
/******************************************************************************
*
* USB legacy support
*
******************************************************************************
*/
/** Prevent the release of ownership back to BIOS */
static int ehci_legacy_prevent_release;
/**
* Initialise USB legacy support
*
* @v ehci EHCI device
* @v pci PCI device
*/
static void ehci_legacy_init ( struct ehci_device *ehci,
struct pci_device *pci ) {
unsigned int legacy;
uint8_t bios;
/* Locate USB legacy support capability (if present) */
legacy = ehci_extended_capability ( ehci, pci, EHCI_EECP_ID_LEGACY, 0 );
if ( ! legacy ) {
/* Not an error; capability may not be present */
DBGC ( ehci, "EHCI %s has no USB legacy support capability\n",
ehci->name );
return;
}
/* Check if legacy USB support is enabled */
pci_read_config_byte ( pci, ( legacy + EHCI_USBLEGSUP_BIOS ), &bios );
if ( ! ( bios & EHCI_USBLEGSUP_BIOS_OWNED ) ) {
/* Not an error; already owned by OS */
DBGC ( ehci, "EHCI %s USB legacy support already disabled\n",
ehci->name );
return;
}
/* Record presence of USB legacy support capability */
ehci->legacy = legacy;
}
/**
* Claim ownership from BIOS
*
* @v ehci EHCI device
* @v pci PCI device
*/
static void ehci_legacy_claim ( struct ehci_device *ehci,
struct pci_device *pci ) {
unsigned int legacy = ehci->legacy;
uint32_t ctlsts;
uint8_t bios;
unsigned int i;
/* Do nothing unless legacy support capability is present */
if ( ! legacy )
return;
/* Dump original SMI usage */
pci_read_config_dword ( pci, ( legacy + EHCI_USBLEGSUP_CTLSTS ),
&ctlsts );
if ( ctlsts ) {
DBGC ( ehci, "EHCI %s BIOS using SMIs: %08x\n",
ehci->name, ctlsts );
}
/* Claim ownership */
pci_write_config_byte ( pci, ( legacy + EHCI_USBLEGSUP_OS ),
EHCI_USBLEGSUP_OS_OWNED );
/* Wait for BIOS to release ownership */
for ( i = 0 ; i < EHCI_USBLEGSUP_MAX_WAIT_MS ; i++ ) {
/* Check if BIOS has released ownership */
pci_read_config_byte ( pci, ( legacy + EHCI_USBLEGSUP_BIOS ),
&bios );
if ( ! ( bios & EHCI_USBLEGSUP_BIOS_OWNED ) ) {
DBGC ( ehci, "EHCI %s claimed ownership from BIOS\n",
ehci->name );
pci_read_config_dword ( pci, ( legacy +
EHCI_USBLEGSUP_CTLSTS ),
&ctlsts );
if ( ctlsts ) {
DBGC ( ehci, "EHCI %s warning: BIOS retained "
"SMIs: %08x\n", ehci->name, ctlsts );
}
return;
}
/* Delay */
mdelay ( 1 );
}
/* BIOS did not release ownership. Claim it forcibly by
* disabling all SMIs.
*/
DBGC ( ehci, "EHCI %s could not claim ownership from BIOS: forcibly "
"disabling SMIs\n", ehci->name );
pci_write_config_dword ( pci, ( legacy + EHCI_USBLEGSUP_CTLSTS ), 0 );
}
/**
* Release ownership back to BIOS
*
* @v ehci EHCI device
* @v pci PCI device
*/
static void ehci_legacy_release ( struct ehci_device *ehci,
struct pci_device *pci ) {
unsigned int legacy = ehci->legacy;
uint32_t ctlsts;
/* Do nothing unless legacy support capability is present */
if ( ! legacy )
return;
/* Do nothing if releasing ownership is prevented */
if ( ehci_legacy_prevent_release ) {
DBGC ( ehci, "EHCI %s not releasing ownership to BIOS\n",
ehci->name );
return;
}
/* Release ownership */
pci_write_config_byte ( pci, ( legacy + EHCI_USBLEGSUP_OS ), 0 );
DBGC ( ehci, "EHCI %s released ownership to BIOS\n", ehci->name );
/* Dump restored SMI usage */
pci_read_config_dword ( pci, ( legacy + EHCI_USBLEGSUP_CTLSTS ),
&ctlsts );
DBGC ( ehci, "EHCI %s BIOS reclaimed SMIs: %08x\n",
ehci->name, ctlsts );
}
/******************************************************************************
*
* Companion controllers
*
******************************************************************************
*/
/**
* Poll child companion controllers
*
* @v ehci EHCI device
*/
static void ehci_poll_companions ( struct ehci_device *ehci ) {
struct usb_bus *bus;
struct device_description *desc;
/* Poll any USB buses belonging to child companion controllers */
for_each_usb_bus ( bus ) {
/* Get underlying devices description */
desc = &bus->dev->desc;
/* Skip buses that are not PCI devices */
if ( desc->bus_type != BUS_TYPE_PCI )
continue;
/* Skip buses that are not part of the same PCI device */
if ( PCI_FIRST_FUNC ( desc->location ) !=
PCI_FIRST_FUNC ( ehci->bus->dev->desc.location ) )
continue;
/* Skip buses that are not UHCI or OHCI PCI devices */
if ( ( desc->class != PCI_CLASS ( PCI_CLASS_SERIAL,
PCI_CLASS_SERIAL_USB,
PCI_CLASS_SERIAL_USB_UHCI ))&&
( desc->class != PCI_CLASS ( PCI_CLASS_SERIAL,
PCI_CLASS_SERIAL_USB,
PCI_CLASS_SERIAL_USB_OHCI ) ))
continue;
/* Poll child companion controller bus */
DBGC2 ( ehci, "EHCI %s polling companion %s\n",
ehci->name, bus->name );
usb_poll ( bus );
}
}
/**
* Locate EHCI companion controller
*
* @v pci PCI device
* @ret busdevfn EHCI companion controller bus:dev.fn (if any)
*/
unsigned int ehci_companion ( struct pci_device *pci ) {
struct pci_device tmp;
unsigned int busdevfn;
int rc;
/* Look for an EHCI function on the same PCI device */
busdevfn = pci->busdevfn;
while ( ++busdevfn <= PCI_LAST_FUNC ( pci->busdevfn ) ) {
pci_init ( &tmp, busdevfn );
if ( ( rc = pci_read_config ( &tmp ) ) != 0 )
continue;
if ( tmp.class == PCI_CLASS ( PCI_CLASS_SERIAL,
PCI_CLASS_SERIAL_USB,
PCI_CLASS_SERIAL_USB_EHCI ) )
return busdevfn;
}
return 0;
}
/******************************************************************************
*
* Run / stop / reset
*
******************************************************************************
*/
/**
* Start EHCI device
*
* @v ehci EHCI device
*/
static void ehci_run ( struct ehci_device *ehci ) {
uint32_t usbcmd;
/* Set run/stop bit */
usbcmd = readl ( ehci->op + EHCI_OP_USBCMD );
usbcmd &= ~EHCI_USBCMD_FLSIZE_MASK;
usbcmd |= ( EHCI_USBCMD_RUN | EHCI_USBCMD_FLSIZE ( ehci->flsize ) |
EHCI_USBCMD_PERIODIC | EHCI_USBCMD_ASYNC );
writel ( usbcmd, ehci->op + EHCI_OP_USBCMD );
}
/**
* Stop EHCI device
*
* @v ehci EHCI device
* @ret rc Return status code
*/
static int ehci_stop ( struct ehci_device *ehci ) {
uint32_t usbcmd;
uint32_t usbsts;
unsigned int i;
/* Clear run/stop bit */
usbcmd = readl ( ehci->op + EHCI_OP_USBCMD );
usbcmd &= ~( EHCI_USBCMD_RUN | EHCI_USBCMD_PERIODIC |
EHCI_USBCMD_ASYNC );
writel ( usbcmd, ehci->op + EHCI_OP_USBCMD );
/* Wait for device to stop */
for ( i = 0 ; i < EHCI_STOP_MAX_WAIT_MS ; i++ ) {
/* Check if device is stopped */
usbsts = readl ( ehci->op + EHCI_OP_USBSTS );
if ( usbsts & EHCI_USBSTS_HCH )
return 0;
/* Delay */
mdelay ( 1 );
}
DBGC ( ehci, "EHCI %s timed out waiting for stop\n", ehci->name );
return -ETIMEDOUT;
}
/**
* Reset EHCI device
*
* @v ehci EHCI device
* @ret rc Return status code
*/
static int ehci_reset ( struct ehci_device *ehci ) {
uint32_t usbcmd;
unsigned int i;
int rc;
/* The EHCI specification states that resetting a running
* device may result in undefined behaviour, so try stopping
* it first.
*/
if ( ( rc = ehci_stop ( ehci ) ) != 0 ) {
/* Ignore errors and attempt to reset the device anyway */
}
/* Reset device */
writel ( EHCI_USBCMD_HCRST, ehci->op + EHCI_OP_USBCMD );
/* Wait for reset to complete */
for ( i = 0 ; i < EHCI_RESET_MAX_WAIT_MS ; i++ ) {
/* Check if reset is complete */
usbcmd = readl ( ehci->op + EHCI_OP_USBCMD );
if ( ! ( usbcmd & EHCI_USBCMD_HCRST ) )
return 0;
/* Delay */
mdelay ( 1 );
}
DBGC ( ehci, "EHCI %s timed out waiting for reset\n", ehci->name );
return -ETIMEDOUT;
}
/******************************************************************************
*
* Transfer descriptor rings
*
******************************************************************************
*/
/**
* Allocate transfer descriptor ring
*
* @v ehci EHCI device
* @v ring Transfer descriptor ring
* @ret rc Return status code
*/
static int ehci_ring_alloc ( struct ehci_device *ehci,
struct ehci_ring *ring ) {
struct ehci_transfer_descriptor *desc;
struct ehci_transfer_descriptor *next;
unsigned int i;
size_t len;
uint32_t link;
int rc;
/* Initialise structure */
memset ( ring, 0, sizeof ( *ring ) );
/* Allocate I/O buffers */
ring->iobuf = zalloc ( EHCI_RING_COUNT * sizeof ( ring->iobuf[0] ) );
if ( ! ring->iobuf ) {
rc = -ENOMEM;
goto err_alloc_iobuf;
}
/* Allocate queue head */
ring->head = malloc_dma ( sizeof ( *ring->head ),
ehci_align ( sizeof ( *ring->head ) ) );
if ( ! ring->head ) {
rc = -ENOMEM;
goto err_alloc_queue;
}
if ( ( rc = ehci_ctrl_reachable ( ehci, ring->head ) ) != 0 ) {
DBGC ( ehci, "EHCI %s queue head unreachable\n", ehci->name );
goto err_unreachable_queue;
}
memset ( ring->head, 0, sizeof ( *ring->head ) );
/* Allocate transfer descriptors */
len = ( EHCI_RING_COUNT * sizeof ( ring->desc[0] ) );
ring->desc = malloc_dma ( len, sizeof ( ring->desc[0] ) );
if ( ! ring->desc ) {
rc = -ENOMEM;
goto err_alloc_desc;
}
memset ( ring->desc, 0, len );
/* Initialise transfer descriptors */
for ( i = 0 ; i < EHCI_RING_COUNT ; i++ ) {
desc = &ring->desc[i];
if ( ( rc = ehci_ctrl_reachable ( ehci, desc ) ) != 0 ) {
DBGC ( ehci, "EHCI %s descriptor unreachable\n",
ehci->name );
goto err_unreachable_desc;
}
next = &ring->desc[ ( i + 1 ) % EHCI_RING_COUNT ];
link = virt_to_phys ( next );
desc->next = cpu_to_le32 ( link );
desc->alt = cpu_to_le32 ( link );
}
/* Initialise queue head */
link = virt_to_phys ( &ring->desc[0] );
ring->head->cache.next = cpu_to_le32 ( link );
return 0;
err_unreachable_desc:
free_dma ( ring->desc, len );
err_alloc_desc:
err_unreachable_queue:
free_dma ( ring->head, sizeof ( *ring->head ) );
err_alloc_queue:
free ( ring->iobuf );
err_alloc_iobuf:
return rc;
}
/**
* Free transfer descriptor ring
*
* @v ring Transfer descriptor ring
*/
static void ehci_ring_free ( struct ehci_ring *ring ) {
unsigned int i;
/* Sanity checks */
assert ( ehci_ring_fill ( ring ) == 0 );
for ( i = 0 ; i < EHCI_RING_COUNT ; i++ )
assert ( ring->iobuf[i] == NULL );
/* Free transfer descriptors */
free_dma ( ring->desc, ( EHCI_RING_COUNT * sizeof ( ring->desc[0] ) ) );
/* Free queue head */
free_dma ( ring->head, sizeof ( *ring->head ) );
/* Free I/O buffers */
free ( ring->iobuf );
}
/**
* Enqueue transfer descriptors
*
* @v ehci EHCI device
* @v ring Transfer descriptor ring
* @v iobuf I/O buffer
* @v xfers Transfers
* @v count Number of transfers
* @ret rc Return status code
*/
static int ehci_enqueue ( struct ehci_device *ehci, struct ehci_ring *ring,
struct io_buffer *iobuf,
const struct ehci_transfer *xfer,
unsigned int count ) {
struct ehci_transfer_descriptor *desc;
physaddr_t phys;
void *data;
size_t len;
size_t offset;
size_t frag_len;
unsigned int toggle;
unsigned int index;
unsigned int i;
/* Sanity check */
assert ( iobuf != NULL );
assert ( count > 0 );
/* Fail if ring does not have sufficient space */
if ( ehci_ring_remaining ( ring ) < count )
return -ENOBUFS;
/* Fail if any portion is unreachable */
for ( i = 0 ; i < count ; i++ ) {
if ( ! xfer[i].len )
continue;
phys = ( virt_to_phys ( xfer[i].data ) + xfer[i].len - 1 );
if ( ( phys > 0xffffffffUL ) && ( ! ehci->addr64 ) )
return -ENOTSUP;
}
/* Enqueue each transfer, recording the I/O buffer with the last */
for ( ; count ; ring->prod++, xfer++ ) {
/* Populate descriptor header */
index = ( ring->prod % EHCI_RING_COUNT );
desc = &ring->desc[index];
toggle = ( xfer->flags & EHCI_FL_TOGGLE );
assert ( xfer->len <= EHCI_LEN_MASK );
assert ( EHCI_FL_TOGGLE == EHCI_LEN_TOGGLE );
desc->len = cpu_to_le16 ( xfer->len | toggle );
desc->flags = ( xfer->flags | EHCI_FL_CERR_MAX );
/* Populate buffer pointers */
data = xfer->data;
len = xfer->len;
for ( i = 0 ; len ; i++ ) {
/* Calculate length of this fragment */
phys = virt_to_phys ( data );
offset = ( phys & ( EHCI_PAGE_ALIGN - 1 ) );
frag_len = ( EHCI_PAGE_ALIGN - offset );
if ( frag_len > len )
frag_len = len;
/* Sanity checks */
assert ( ( i == 0 ) || ( offset == 0 ) );
assert ( i < ( sizeof ( desc->low ) /
sizeof ( desc->low[0] ) ) );
/* Populate buffer pointer */
desc->low[i] = cpu_to_le32 ( phys );
if ( sizeof ( physaddr_t ) > sizeof ( uint32_t ) ) {
desc->high[i] =
cpu_to_le32 ( ((uint64_t) phys) >> 32 );
}
/* Move to next fragment */
data += frag_len;
len -= frag_len;
}
/* Ensure everything is valid before activating descriptor */
wmb();
desc->status = EHCI_STATUS_ACTIVE;
/* Record I/O buffer against last ring index */
if ( --count == 0 )
ring->iobuf[index] = iobuf;
}
return 0;
}
/**
* Dequeue a transfer descriptor
*
* @v ring Transfer descriptor ring
* @ret iobuf I/O buffer (or NULL)
*/
static struct io_buffer * ehci_dequeue ( struct ehci_ring *ring ) {
struct ehci_transfer_descriptor *desc;
struct io_buffer *iobuf;
unsigned int index = ( ring->cons % EHCI_RING_COUNT );
/* Sanity check */
assert ( ehci_ring_fill ( ring ) > 0 );
/* Mark descriptor as inactive (and not halted) */
desc = &ring->desc[index];
desc->status = 0;
/* Retrieve I/O buffer */
iobuf = ring->iobuf[index];
ring->iobuf[index] = NULL;
/* Update consumer counter */
ring->cons++;
return iobuf;
}
/******************************************************************************
*
* Schedule management
*
******************************************************************************
*/
/**
* Get link value for a queue head
*
* @v queue Queue head
* @ret link Link value
*/
static inline uint32_t ehci_link_qh ( struct ehci_queue_head *queue ) {
return ( virt_to_phys ( queue ) | EHCI_LINK_TYPE_QH );
}
/**
* (Re)build asynchronous schedule
*
* @v ehci EHCI device
*/
static void ehci_async_schedule ( struct ehci_device *ehci ) {
struct ehci_endpoint *endpoint;
struct ehci_queue_head *queue;
uint32_t link;
/* Build schedule in reverse order of execution. Provided
* that we only ever add or remove single endpoints, this can
* safely run concurrently with hardware execution of the
* schedule.
*/
link = ehci_link_qh ( ehci->head );
list_for_each_entry_reverse ( endpoint, &ehci->async, schedule ) {
queue = endpoint->ring.head;
queue->link = cpu_to_le32 ( link );
wmb();
link = ehci_link_qh ( queue );
}
ehci->head->link = cpu_to_le32 ( link );
wmb();
}
/**
* Add endpoint to asynchronous schedule
*
* @v endpoint Endpoint
*/
static void ehci_async_add ( struct ehci_endpoint *endpoint ) {
struct ehci_device *ehci = endpoint->ehci;
/* Add to end of schedule */
list_add_tail ( &endpoint->schedule, &ehci->async );
/* Rebuild schedule */
ehci_async_schedule ( ehci );
}
/**
* Remove endpoint from asynchronous schedule
*
* @v endpoint Endpoint
* @ret rc Return status code
*/
static int ehci_async_del ( struct ehci_endpoint *endpoint ) {
struct ehci_device *ehci = endpoint->ehci;
uint32_t usbcmd;
uint32_t usbsts;
unsigned int i;
/* Remove from schedule */
list_check_contains_entry ( endpoint, &ehci->async, schedule );
list_del ( &endpoint->schedule );
/* Rebuild schedule */
ehci_async_schedule ( ehci );
/* Request notification when asynchronous schedule advances */
usbcmd = readl ( ehci->op + EHCI_OP_USBCMD );
usbcmd |= EHCI_USBCMD_ASYNC_ADVANCE;
writel ( usbcmd, ehci->op + EHCI_OP_USBCMD );
/* Wait for asynchronous schedule to advance */
for ( i = 0 ; i < EHCI_ASYNC_ADVANCE_MAX_WAIT_MS ; i++ ) {
/* Check for asynchronous schedule advancing */
usbsts = readl ( ehci->op + EHCI_OP_USBSTS );
if ( usbsts & EHCI_USBSTS_ASYNC_ADVANCE ) {
usbsts &= ~EHCI_USBSTS_CHANGE;
usbsts |= EHCI_USBSTS_ASYNC_ADVANCE;
writel ( usbsts, ehci->op + EHCI_OP_USBSTS );
return 0;
}
/* Delay */
mdelay ( 1 );
}
/* Bad things will probably happen now */
DBGC ( ehci, "EHCI %s timed out waiting for asynchronous schedule "
"to advance\n", ehci->name );
return -ETIMEDOUT;
}
/**
* (Re)build periodic schedule
*
* @v ehci EHCI device
*/
static void ehci_periodic_schedule ( struct ehci_device *ehci ) {
struct ehci_endpoint *endpoint;
struct ehci_queue_head *queue;
uint32_t link;
unsigned int frames;
unsigned int max_interval;
unsigned int i;
/* Build schedule in reverse order of execution. Provided
* that we only ever add or remove single endpoints, this can
* safely run concurrently with hardware execution of the
* schedule.
*/
DBGCP ( ehci, "EHCI %s periodic schedule: ", ehci->name );
link = EHCI_LINK_TERMINATE;
list_for_each_entry_reverse ( endpoint, &ehci->periodic, schedule ) {
queue = endpoint->ring.head;
queue->link = cpu_to_le32 ( link );
wmb();
DBGCP ( ehci, "%s%d",
( ( link == EHCI_LINK_TERMINATE ) ? "" : "<-" ),
endpoint->ep->interval );
link = ehci_link_qh ( queue );
}
DBGCP ( ehci, "\n" );
/* Populate periodic frame list */
DBGCP ( ehci, "EHCI %s periodic frame list:", ehci->name );
frames = EHCI_PERIODIC_FRAMES ( ehci->flsize );
for ( i = 0 ; i < frames ; i++ ) {
/* Calculate maximum interval (in microframes) which
* may appear as part of this frame list.
*/
if ( i == 0 ) {
/* Start of list: include all endpoints */
max_interval = -1U;
} else {
/* Calculate highest power-of-two frame interval */
max_interval = ( 1 << ( ffs ( i ) - 1 ) );
/* Convert to microframes */
max_interval <<= 3;
/* Round up to nearest 2^n-1 */
max_interval = ( ( max_interval << 1 ) - 1 );
}
/* Find first endpoint in schedule satisfying this
* maximum interval constraint.
*/
link = EHCI_LINK_TERMINATE;
list_for_each_entry ( endpoint, &ehci->periodic, schedule ) {
if ( endpoint->ep->interval <= max_interval ) {
queue = endpoint->ring.head;
link = ehci_link_qh ( queue );
DBGCP ( ehci, " %d:%d",
i, endpoint->ep->interval );
break;
}
}
ehci->frame[i].link = cpu_to_le32 ( link );
}
wmb();
DBGCP ( ehci, "\n" );
}
/**
* Add endpoint to periodic schedule
*
* @v endpoint Endpoint
*/
static void ehci_periodic_add ( struct ehci_endpoint *endpoint ) {
struct ehci_device *ehci = endpoint->ehci;
struct ehci_endpoint *before;
unsigned int interval = endpoint->ep->interval;
/* Find first endpoint with a smaller interval */
list_for_each_entry ( before, &ehci->periodic, schedule ) {
if ( before->ep->interval < interval )
break;
}
list_add_tail ( &endpoint->schedule, &before->schedule );
/* Rebuild schedule */
ehci_periodic_schedule ( ehci );
}
/**
* Remove endpoint from periodic schedule
*
* @v endpoint Endpoint
* @ret rc Return status code
*/
static int ehci_periodic_del ( struct ehci_endpoint *endpoint ) {
struct ehci_device *ehci = endpoint->ehci;
/* Remove from schedule */
list_check_contains_entry ( endpoint, &ehci->periodic, schedule );
list_del ( &endpoint->schedule );
/* Rebuild schedule */
ehci_periodic_schedule ( ehci );
/* Delay for a whole USB frame (with a 100% safety margin) */
mdelay ( 2 );
return 0;
}
/**
* Add endpoint to appropriate schedule
*
* @v endpoint Endpoint
*/
static void ehci_schedule_add ( struct ehci_endpoint *endpoint ) {
struct usb_endpoint *ep = endpoint->ep;
unsigned int attr = ( ep->attributes & USB_ENDPOINT_ATTR_TYPE_MASK );
if ( attr == USB_ENDPOINT_ATTR_INTERRUPT ) {
ehci_periodic_add ( endpoint );
} else {
ehci_async_add ( endpoint );
}
}
/**
* Remove endpoint from appropriate schedule
*
* @v endpoint Endpoint
* @ret rc Return status code
*/
static int ehci_schedule_del ( struct ehci_endpoint *endpoint ) {
struct usb_endpoint *ep = endpoint->ep;
unsigned int attr = ( ep->attributes & USB_ENDPOINT_ATTR_TYPE_MASK );
if ( attr == USB_ENDPOINT_ATTR_INTERRUPT ) {
return ehci_periodic_del ( endpoint );
} else {
return ehci_async_del ( endpoint );
}
}
/******************************************************************************
*
* Endpoint operations
*
******************************************************************************
*/
/**
* Determine endpoint characteristics
*
* @v ep USB endpoint
* @ret chr Endpoint characteristics
*/
static uint32_t ehci_endpoint_characteristics ( struct usb_endpoint *ep ) {
struct usb_device *usb = ep->usb;
unsigned int attr = ( ep->attributes & USB_ENDPOINT_ATTR_TYPE_MASK );
uint32_t chr;
/* Determine basic characteristics */
chr = ( EHCI_CHR_ADDRESS ( usb->address ) |
EHCI_CHR_ENDPOINT ( ep->address ) |
EHCI_CHR_MAX_LEN ( ep->mtu ) );
/* Control endpoints require manual control of the data toggle */
if ( attr == USB_ENDPOINT_ATTR_CONTROL )
chr |= EHCI_CHR_TOGGLE;
/* Determine endpoint speed */
if ( usb->speed == USB_SPEED_HIGH ) {
chr |= EHCI_CHR_EPS_HIGH;
} else {
if ( usb->speed == USB_SPEED_FULL ) {
chr |= EHCI_CHR_EPS_FULL;
} else {
chr |= EHCI_CHR_EPS_LOW;
}
if ( attr == USB_ENDPOINT_ATTR_CONTROL )
chr |= EHCI_CHR_CONTROL;
}
return chr;
}
/**
* Determine endpoint capabilities
*
* @v ep USB endpoint
* @ret cap Endpoint capabilities
*/
static uint32_t ehci_endpoint_capabilities ( struct usb_endpoint *ep ) {
struct usb_device *usb = ep->usb;
struct usb_port *tt = usb_transaction_translator ( usb );
unsigned int attr = ( ep->attributes & USB_ENDPOINT_ATTR_TYPE_MASK );
uint32_t cap;
unsigned int i;
/* Determine basic capabilities */
cap = EHCI_CAP_MULT ( ep->burst + 1 );
/* Determine interrupt schedule mask, if applicable */
if ( ( attr == USB_ENDPOINT_ATTR_INTERRUPT ) &&
( ( ep->interval != 0 ) /* avoid infinite loop */ ) ) {
for ( i = 0 ; i < 8 /* microframes per frame */ ;
i += ep->interval ) {
cap |= EHCI_CAP_INTR_SCHED ( i );
}
}
/* Set transaction translator hub address and port, if applicable */
if ( tt ) {
assert ( tt->hub->usb );
cap |= ( EHCI_CAP_TT_HUB ( tt->hub->usb->address ) |
EHCI_CAP_TT_PORT ( tt->address ) );
if ( attr == USB_ENDPOINT_ATTR_INTERRUPT )
cap |= EHCI_CAP_SPLIT_SCHED_DEFAULT;
}
return cap;
}
/**
* Update endpoint characteristics and capabilities
*
* @v ep USB endpoint
*/
static void ehci_endpoint_update ( struct usb_endpoint *ep ) {
struct ehci_endpoint *endpoint = usb_endpoint_get_hostdata ( ep );
struct ehci_queue_head *head;
/* Update queue characteristics and capabilities */
head = endpoint->ring.head;
head->chr = cpu_to_le32 ( ehci_endpoint_characteristics ( ep ) );
head->cap = cpu_to_le32 ( ehci_endpoint_capabilities ( ep ) );
}
/**
* Open endpoint
*
* @v ep USB endpoint
* @ret rc Return status code
*/
static int ehci_endpoint_open ( struct usb_endpoint *ep ) {
struct usb_device *usb = ep->usb;
struct ehci_device *ehci = usb_get_hostdata ( usb );
struct ehci_endpoint *endpoint;
int rc;
/* Allocate and initialise structure */
endpoint = zalloc ( sizeof ( *endpoint ) );
if ( ! endpoint ) {
rc = -ENOMEM;
goto err_alloc;
}
endpoint->ehci = ehci;
endpoint->ep = ep;
usb_endpoint_set_hostdata ( ep, endpoint );
/* Initialise descriptor ring */
if ( ( rc = ehci_ring_alloc ( ehci, &endpoint->ring ) ) != 0 )
goto err_ring_alloc;
/* Update queue characteristics and capabilities */
ehci_endpoint_update ( ep );
/* Add to list of endpoints */
list_add_tail ( &endpoint->list, &ehci->endpoints );
/* Add to schedule */
ehci_schedule_add ( endpoint );
return 0;
ehci_ring_free ( &endpoint->ring );
err_ring_alloc:
free ( endpoint );
err_alloc:
return rc;
}
/**
* Close endpoint
*
* @v ep USB endpoint
*/
static void ehci_endpoint_close ( struct usb_endpoint *ep ) {
struct ehci_endpoint *endpoint = usb_endpoint_get_hostdata ( ep );
struct ehci_device *ehci = endpoint->ehci;
struct usb_device *usb = ep->usb;
struct io_buffer *iobuf;
int rc;
/* Remove from schedule */
if ( ( rc = ehci_schedule_del ( endpoint ) ) != 0 ) {
/* No way to prevent hardware from continuing to
* access the memory, so leak it.
*/
DBGC ( ehci, "EHCI %s %s could not unschedule: %s\n",
usb->name, usb_endpoint_name ( ep ), strerror ( rc ) );
return;
}
/* Cancel any incomplete transfers */
while ( ehci_ring_fill ( &endpoint->ring ) ) {
iobuf = ehci_dequeue ( &endpoint->ring );
if ( iobuf )
usb_complete_err ( ep, iobuf, -ECANCELED );
}
/* Remove from list of endpoints */
list_del ( &endpoint->list );
/* Free descriptor ring */
ehci_ring_free ( &endpoint->ring );
/* Free endpoint */
free ( endpoint );
}
/**
* Reset endpoint
*
* @v ep USB endpoint
* @ret rc Return status code
*/
static int ehci_endpoint_reset ( struct usb_endpoint *ep ) {
struct ehci_endpoint *endpoint = usb_endpoint_get_hostdata ( ep );
struct ehci_ring *ring = &endpoint->ring;
struct ehci_transfer_descriptor *cache = &ring->head->cache;
uint32_t link;
/* Sanity checks */
assert ( ! ( cache->status & EHCI_STATUS_ACTIVE ) );
assert ( cache->status & EHCI_STATUS_HALTED );
/* Reset residual count */
ring->residual = 0;
/* Reset data toggle */
cache->len = 0;
/* Prepare to restart at next unconsumed descriptor */
link = virt_to_phys ( &ring->desc[ ring->cons % EHCI_RING_COUNT ] );
cache->next = cpu_to_le32 ( link );
/* Restart ring */
wmb();
cache->status = 0;
return 0;
}
/**
* Update MTU
*
* @v ep USB endpoint
* @ret rc Return status code
*/
static int ehci_endpoint_mtu ( struct usb_endpoint *ep ) {
/* Update endpoint characteristics and capabilities */
ehci_endpoint_update ( ep );
return 0;
}
/**
* Enqueue message transfer
*
* @v ep USB endpoint
* @v iobuf I/O buffer
* @ret rc Return status code
*/
static int ehci_endpoint_message ( struct usb_endpoint *ep,
struct io_buffer *iobuf ) {
struct ehci_endpoint *endpoint = usb_endpoint_get_hostdata ( ep );
struct ehci_device *ehci = endpoint->ehci;
struct usb_setup_packet *packet;
unsigned int input;
struct ehci_transfer xfers[3];
struct ehci_transfer *xfer = xfers;
size_t len;
int rc;
/* Construct setup stage */
assert ( iob_len ( iobuf ) >= sizeof ( *packet ) );
packet = iobuf->data;
iob_pull ( iobuf, sizeof ( *packet ) );
xfer->data = packet;
xfer->len = sizeof ( *packet );
xfer->flags = EHCI_FL_PID_SETUP;
xfer++;
/* Construct data stage, if applicable */
len = iob_len ( iobuf );
input = ( packet->request & cpu_to_le16 ( USB_DIR_IN ) );
if ( len ) {
xfer->data = iobuf->data;
xfer->len = len;
xfer->flags = ( EHCI_FL_TOGGLE |
( input ? EHCI_FL_PID_IN : EHCI_FL_PID_OUT ) );
xfer++;
}
/* Construct status stage */
xfer->data = NULL;
xfer->len = 0;
xfer->flags = ( EHCI_FL_TOGGLE | EHCI_FL_IOC |
( ( len && input ) ? EHCI_FL_PID_OUT : EHCI_FL_PID_IN));
xfer++;
/* Enqueue transfer */
if ( ( rc = ehci_enqueue ( ehci, &endpoint->ring, iobuf, xfers,
( xfer - xfers ) ) ) != 0 )
return rc;
return 0;
}
/**
* Calculate number of transfer descriptors
*
* @v len Length of data
* @v zlp Append a zero-length packet
* @ret count Number of transfer descriptors
*/
static unsigned int ehci_endpoint_count ( size_t len, int zlp ) {
unsigned int count;
/* Split into 16kB transfers. A single transfer can handle up
* to 20kB if it happens to be page-aligned, or up to 16kB
* with arbitrary alignment. We simplify the code by assuming
* that we can fit only 16kB into each transfer.
*/
count = ( ( len + EHCI_MTU - 1 ) / EHCI_MTU );
/* Append a zero-length transfer if applicable */
if ( zlp || ( count == 0 ) )
count++;
return count;
}
/**
* Enqueue stream transfer
*
* @v ep USB endpoint
* @v iobuf I/O buffer
* @v zlp Append a zero-length packet
* @ret rc Return status code
*/
static int ehci_endpoint_stream ( struct usb_endpoint *ep,
struct io_buffer *iobuf, int zlp ) {
struct ehci_endpoint *endpoint = usb_endpoint_get_hostdata ( ep );
struct ehci_device *ehci = endpoint->ehci;
void *data = iobuf->data;
size_t len = iob_len ( iobuf );
unsigned int count = ehci_endpoint_count ( len, zlp );
unsigned int input = ( ep->address & USB_DIR_IN );
unsigned int flags = ( input ? EHCI_FL_PID_IN : EHCI_FL_PID_OUT );
struct ehci_transfer xfers[count];
struct ehci_transfer *xfer = xfers;
size_t xfer_len;
unsigned int i;
int rc;
/* Create transfers */
for ( i = 0 ; i < count ; i++ ) {
/* Calculate transfer length */
xfer_len = EHCI_MTU;
if ( xfer_len > len )
xfer_len = len;
/* Create transfer */
xfer->data = data;
xfer->len = xfer_len;
xfer->flags = flags;
/* Move to next transfer */
data += xfer_len;
len -= xfer_len;
xfer++;
}
xfer[-1].flags |= EHCI_FL_IOC;
/* Enqueue transfer */
if ( ( rc = ehci_enqueue ( ehci, &endpoint->ring, iobuf, xfers,
count ) ) != 0 )
return rc;
return 0;
}
/**
* Poll for completions
*
* @v endpoint Endpoint
*/
static void ehci_endpoint_poll ( struct ehci_endpoint *endpoint ) {
struct ehci_device *ehci = endpoint->ehci;
struct ehci_ring *ring = &endpoint->ring;
struct ehci_transfer_descriptor *desc;
struct usb_endpoint *ep = endpoint->ep;
struct usb_device *usb = ep->usb;
struct io_buffer *iobuf;
unsigned int index;
unsigned int status;
int rc;
/* Consume all completed descriptors */
while ( ehci_ring_fill ( &endpoint->ring ) ) {
/* Stop if we reach an uncompleted descriptor */
rmb();
index = ( ring->cons % EHCI_RING_COUNT );
desc = &ring->desc[index];
status = desc->status;
if ( status & EHCI_STATUS_ACTIVE )
break;
/* Consume this descriptor */
iobuf = ehci_dequeue ( ring );
/* If we have encountered an error, then consume all
* remaining descriptors in this transaction, report
* the error to the USB core, and stop further
* processing.
*/
if ( status & EHCI_STATUS_HALTED ) {
rc = -EIO_STATUS ( status );
DBGC ( ehci, "EHCI %s %s completion %d failed (status "
"%02x): %s\n", usb->name,
usb_endpoint_name ( ep ), index, status,
strerror ( rc ) );
while ( ! iobuf )
iobuf = ehci_dequeue ( ring );
usb_complete_err ( endpoint->ep, iobuf, rc );
return;
}
/* Accumulate residual data count */
ring->residual += ( le16_to_cpu ( desc->len ) & EHCI_LEN_MASK );
/* If this is not the end of a transaction (i.e. has
* no I/O buffer), then continue to next descriptor.
*/
if ( ! iobuf )
continue;
/* Update I/O buffer length */
iob_unput ( iobuf, ring->residual );
ring->residual = 0;
/* Report completion to USB core */
usb_complete ( endpoint->ep, iobuf );
}
}
/******************************************************************************
*
* Device operations
*
******************************************************************************
*/
/**
* Open device
*
* @v usb USB device
* @ret rc Return status code
*/
static int ehci_device_open ( struct usb_device *usb ) {
struct ehci_device *ehci = usb_bus_get_hostdata ( usb->port->hub->bus );
usb_set_hostdata ( usb, ehci );
return 0;
}
/**
* Close device
*
* @v usb USB device
*/
static void ehci_device_close ( struct usb_device *usb ) {
struct ehci_device *ehci = usb_get_hostdata ( usb );
struct usb_bus *bus = ehci->bus;
/* Free device address, if assigned */
if ( usb->address )
usb_free_address ( bus, usb->address );
}
/**
* Assign device address
*
* @v usb USB device
* @ret rc Return status code
*/
static int ehci_device_address ( struct usb_device *usb ) {
struct ehci_device *ehci = usb_get_hostdata ( usb );
struct usb_bus *bus = ehci->bus;
struct usb_endpoint *ep0 = usb_endpoint ( usb, USB_EP0_ADDRESS );
int address;
int rc;
/* Sanity checks */
assert ( usb->address == 0 );
assert ( ep0 != NULL );
/* Allocate device address */
address = usb_alloc_address ( bus );
if ( address < 0 ) {
rc = address;
DBGC ( ehci, "EHCI %s could not allocate address: %s\n",
usb->name, strerror ( rc ) );
goto err_alloc_address;
}
/* Set address */
if ( ( rc = usb_set_address ( usb, address ) ) != 0 )
goto err_set_address;
/* Update device address */
usb->address = address;
/* Update control endpoint characteristics and capabilities */
ehci_endpoint_update ( ep0 );
return 0;
err_set_address:
usb_free_address ( bus, address );
err_alloc_address:
return rc;
}
/******************************************************************************
*
* Hub operations
*
******************************************************************************
*/
/**
* Open hub
*
* @v hub USB hub
* @ret rc Return status code
*/
static int ehci_hub_open ( struct usb_hub *hub __unused ) {
/* Nothing to do */
return 0;
}
/**
* Close hub
*
* @v hub USB hub
*/
static void ehci_hub_close ( struct usb_hub *hub __unused ) {
/* Nothing to do */
}
/******************************************************************************
*
* Root hub operations
*
******************************************************************************
*/
/**
* Open root hub
*
* @v hub USB hub
* @ret rc Return status code
*/
static int ehci_root_open ( struct usb_hub *hub ) {
struct usb_bus *bus = hub->bus;
struct ehci_device *ehci = usb_bus_get_hostdata ( bus );
uint32_t portsc;
unsigned int i;
/* Route all ports to EHCI controller */
writel ( EHCI_CONFIGFLAG_CF, ehci->op + EHCI_OP_CONFIGFLAG );
/* Enable power to all ports */
for ( i = 1 ; i <= ehci->ports ; i++ ) {
portsc = readl ( ehci->op + EHCI_OP_PORTSC ( i ) );
portsc &= ~EHCI_PORTSC_CHANGE;
portsc |= EHCI_PORTSC_PP;
writel ( portsc, ehci->op + EHCI_OP_PORTSC ( i ) );
}
/* Wait 20ms after potentially enabling power to a port */
mdelay ( EHCI_PORT_POWER_DELAY_MS );
/* Record hub driver private data */
usb_hub_set_drvdata ( hub, ehci );
return 0;
}
/**
* Close root hub
*
* @v hub USB hub
*/
static void ehci_root_close ( struct usb_hub *hub ) {
struct ehci_device *ehci = usb_hub_get_drvdata ( hub );
/* Route all ports back to companion controllers */
writel ( 0, ehci->op + EHCI_OP_CONFIGFLAG );
/* Clear hub driver private data */
usb_hub_set_drvdata ( hub, NULL );
}
/**
* Enable port
*
* @v hub USB hub
* @v port USB port
* @ret rc Return status code
*/
static int ehci_root_enable ( struct usb_hub *hub, struct usb_port *port ) {
struct ehci_device *ehci = usb_hub_get_drvdata ( hub );
uint32_t portsc;
unsigned int line;
unsigned int i;
/* Check for a low-speed device */
portsc = readl ( ehci->op + EHCI_OP_PORTSC ( port->address ) );
line = EHCI_PORTSC_LINE_STATUS ( portsc );
if ( line == EHCI_PORTSC_LINE_STATUS_LOW ) {
DBGC ( ehci, "EHCI %s-%d detected low-speed device: "
"disowning\n", ehci->name, port->address );
goto disown;
}
/* Reset port */
portsc &= ~( EHCI_PORTSC_PED | EHCI_PORTSC_CHANGE );
portsc |= EHCI_PORTSC_PR;
writel ( portsc, ehci->op + EHCI_OP_PORTSC ( port->address ) );
mdelay ( USB_RESET_DELAY_MS );
portsc &= ~EHCI_PORTSC_PR;
writel ( portsc, ehci->op + EHCI_OP_PORTSC ( port->address ) );
/* Wait for reset to complete */
for ( i = 0 ; i < EHCI_PORT_RESET_MAX_WAIT_MS ; i++ ) {
/* Check port status */
portsc = readl ( ehci->op + EHCI_OP_PORTSC ( port->address ) );
if ( ! ( portsc & EHCI_PORTSC_PR ) ) {
if ( portsc & EHCI_PORTSC_PED )
return 0;
DBGC ( ehci, "EHCI %s-%d not enabled after reset: "
"disowning\n", ehci->name, port->address );
goto disown;
}
/* Delay */
mdelay ( 1 );
}
DBGC ( ehci, "EHCI %s-%d timed out waiting for port to reset\n",
ehci->name, port->address );
return -ETIMEDOUT;
disown:
/* Disown port */
portsc &= ~EHCI_PORTSC_CHANGE;
portsc |= EHCI_PORTSC_OWNER;
writel ( portsc, ehci->op + EHCI_OP_PORTSC ( port->address ) );
/* Delay to allow child companion controllers to settle */
mdelay ( EHCI_DISOWN_DELAY_MS );
/* Poll child companion controllers */
ehci_poll_companions ( ehci );
return -ENODEV;
}
/**
* Disable port
*
* @v hub USB hub
* @v port USB port
* @ret rc Return status code
*/
static int ehci_root_disable ( struct usb_hub *hub, struct usb_port *port ) {
struct ehci_device *ehci = usb_hub_get_drvdata ( hub );
uint32_t portsc;
/* Disable port */
portsc = readl ( ehci->op + EHCI_OP_PORTSC ( port->address ) );
portsc &= ~( EHCI_PORTSC_PED | EHCI_PORTSC_CHANGE );
writel ( portsc, ehci->op + EHCI_OP_PORTSC ( port->address ) );
return 0;
}
/**
* Update root hub port speed
*
* @v hub USB hub
* @v port USB port
* @ret rc Return status code
*/
static int ehci_root_speed ( struct usb_hub *hub, struct usb_port *port ) {
struct ehci_device *ehci = usb_hub_get_drvdata ( hub );
uint32_t portsc;
unsigned int speed;
unsigned int line;
int ccs;
int csc;
int ped;
/* Read port status */
portsc = readl ( ehci->op + EHCI_OP_PORTSC ( port->address ) );
DBGC2 ( ehci, "EHCI %s-%d status is %08x\n",
ehci->name, port->address, portsc );
ccs = ( portsc & EHCI_PORTSC_CCS );
csc = ( portsc & EHCI_PORTSC_CSC );
ped = ( portsc & EHCI_PORTSC_PED );
line = EHCI_PORTSC_LINE_STATUS ( portsc );
/* Record disconnections and clear changes */
port->disconnected |= csc;
writel ( portsc, ehci->op + EHCI_OP_PORTSC ( port->address ) );
/* Determine port speed */
if ( ! ccs ) {
/* Port not connected */
speed = USB_SPEED_NONE;
} else if ( line == EHCI_PORTSC_LINE_STATUS_LOW ) {
/* Detected as low-speed */
speed = USB_SPEED_LOW;
} else if ( ped ) {
/* Port already enabled: must be high-speed */
speed = USB_SPEED_HIGH;
} else {
/* Not low-speed and not yet enabled. Could be either
* full-speed or high-speed; we can't yet tell.
*/
speed = USB_SPEED_FULL;
}
port->speed = speed;
return 0;
}
/**
* Clear transaction translator buffer
*
* @v hub USB hub
* @v port USB port
* @v ep USB endpoint
* @ret rc Return status code
*/
static int ehci_root_clear_tt ( struct usb_hub *hub, struct usb_port *port,
struct usb_endpoint *ep ) {
struct ehci_device *ehci = usb_hub_get_drvdata ( hub );
/* Should never be called; this is a root hub */
DBGC ( ehci, "EHCI %s-%d nonsensical CLEAR_TT for %s %s\n", ehci->name,
port->address, ep->usb->name, usb_endpoint_name ( ep ) );
return -ENOTSUP;
}
/**
* Poll for port status changes
*
* @v hub USB hub
* @v port USB port
*/
static void ehci_root_poll ( struct usb_hub *hub, struct usb_port *port ) {
struct ehci_device *ehci = usb_hub_get_drvdata ( hub );
uint32_t portsc;
uint32_t change;
/* Do nothing unless something has changed */
portsc = readl ( ehci->op + EHCI_OP_PORTSC ( port->address ) );
change = ( portsc & EHCI_PORTSC_CHANGE );
if ( ! change )
return;
/* Record disconnections and clear changes */
port->disconnected |= ( portsc & EHCI_PORTSC_CSC );
writel ( portsc, ehci->op + EHCI_OP_PORTSC ( port->address ) );
/* Report port status change */
usb_port_changed ( port );
}
/******************************************************************************
*
* Bus operations
*
******************************************************************************
*/
/**
* Open USB bus
*
* @v bus USB bus
* @ret rc Return status code
*/
static int ehci_bus_open ( struct usb_bus *bus ) {
struct ehci_device *ehci = usb_bus_get_hostdata ( bus );
unsigned int frames;
size_t len;
int rc;
/* Sanity checks */
assert ( list_empty ( &ehci->async ) );
assert ( list_empty ( &ehci->periodic ) );
/* Allocate and initialise asynchronous queue head */
ehci->head = malloc_dma ( sizeof ( *ehci->head ),
ehci_align ( sizeof ( *ehci->head ) ) );
if ( ! ehci->head ) {
rc = -ENOMEM;
goto err_alloc_head;
}
memset ( ehci->head, 0, sizeof ( *ehci->head ) );
ehci->head->chr = cpu_to_le32 ( EHCI_CHR_HEAD );
ehci->head->cache.next = cpu_to_le32 ( EHCI_LINK_TERMINATE );
ehci->head->cache.status = EHCI_STATUS_HALTED;
ehci_async_schedule ( ehci );
writel ( virt_to_phys ( ehci->head ),
ehci->op + EHCI_OP_ASYNCLISTADDR );
/* Use async queue head to determine control data structure segment */
ehci->ctrldssegment =
( ( ( uint64_t ) virt_to_phys ( ehci->head ) ) >> 32 );
if ( ehci->addr64 ) {
writel ( ehci->ctrldssegment, ehci->op + EHCI_OP_CTRLDSSEGMENT);
} else if ( ehci->ctrldssegment ) {
DBGC ( ehci, "EHCI %s CTRLDSSEGMENT not supported\n",
ehci->name );
rc = -ENOTSUP;
goto err_ctrldssegment;
}
/* Allocate periodic frame list */
frames = EHCI_PERIODIC_FRAMES ( ehci->flsize );
len = ( frames * sizeof ( ehci->frame[0] ) );
ehci->frame = malloc_dma ( len, EHCI_PAGE_ALIGN );
if ( ! ehci->frame ) {
rc = -ENOMEM;
goto err_alloc_frame;
}
if ( ( rc = ehci_ctrl_reachable ( ehci, ehci->frame ) ) != 0 ) {
DBGC ( ehci, "EHCI %s frame list unreachable\n", ehci->name );
goto err_unreachable_frame;
}
ehci_periodic_schedule ( ehci );
writel ( virt_to_phys ( ehci->frame ),
ehci->op + EHCI_OP_PERIODICLISTBASE );
/* Start controller */
ehci_run ( ehci );
return 0;
ehci_stop ( ehci );
err_unreachable_frame:
free_dma ( ehci->frame, len );
err_alloc_frame:
err_ctrldssegment:
free_dma ( ehci->head, sizeof ( *ehci->head ) );
err_alloc_head:
return rc;
}
/**
* Close USB bus
*
* @v bus USB bus
*/
static void ehci_bus_close ( struct usb_bus *bus ) {
struct ehci_device *ehci = usb_bus_get_hostdata ( bus );
unsigned int frames = EHCI_PERIODIC_FRAMES ( ehci->flsize );
/* Sanity checks */
assert ( list_empty ( &ehci->async ) );
assert ( list_empty ( &ehci->periodic ) );
/* Stop controller */
ehci_stop ( ehci );
/* Free periodic frame list */
free_dma ( ehci->frame, ( frames * sizeof ( ehci->frame[0] ) ) );
/* Free asynchronous schedule */
free_dma ( ehci->head, sizeof ( *ehci->head ) );
}
/**
* Poll USB bus
*
* @v bus USB bus
*/
static void ehci_bus_poll ( struct usb_bus *bus ) {
struct ehci_device *ehci = usb_bus_get_hostdata ( bus );
struct usb_hub *hub = bus->hub;
struct ehci_endpoint *endpoint;
unsigned int i;
uint32_t usbsts;
uint32_t change;
/* Do nothing unless something has changed */
usbsts = readl ( ehci->op + EHCI_OP_USBSTS );
assert ( usbsts & EHCI_USBSTS_ASYNC );
assert ( usbsts & EHCI_USBSTS_PERIODIC );
assert ( ! ( usbsts & EHCI_USBSTS_HCH ) );
change = ( usbsts & EHCI_USBSTS_CHANGE );
if ( ! change )
return;
/* Acknowledge changes */
writel ( usbsts, ehci->op + EHCI_OP_USBSTS );
/* Process completions, if applicable */
if ( change & ( EHCI_USBSTS_USBINT | EHCI_USBSTS_USBERRINT ) ) {
/* Iterate over all endpoints looking for completed
* descriptors. We trust that completion handlers are
* minimal and will not do anything that could
* plausibly affect the endpoint list itself.
*/
list_for_each_entry ( endpoint, &ehci->endpoints, list )
ehci_endpoint_poll ( endpoint );
}
/* Process port status changes, if applicable */
if ( change & EHCI_USBSTS_PORT ) {
/* Iterate over all ports looking for status changes */
for ( i = 1 ; i <= ehci->ports ; i++ )
ehci_root_poll ( hub, usb_port ( hub, i ) );
}
/* Report fatal errors */
if ( change & EHCI_USBSTS_SYSERR )
DBGC ( ehci, "EHCI %s host system error\n", ehci->name );
}
/******************************************************************************
*
* PCI interface
*
******************************************************************************
*/
/** USB host controller operations */
static struct usb_host_operations ehci_operations = {
.endpoint = {
.open = ehci_endpoint_open,
.close = ehci_endpoint_close,
.reset = ehci_endpoint_reset,
.mtu = ehci_endpoint_mtu,
.message = ehci_endpoint_message,
.stream = ehci_endpoint_stream,
},
.device = {
.open = ehci_device_open,
.close = ehci_device_close,
.address = ehci_device_address,
},
.bus = {
.open = ehci_bus_open,
.close = ehci_bus_close,
.poll = ehci_bus_poll,
},
.hub = {
.open = ehci_hub_open,
.close = ehci_hub_close,
},
.root = {
.open = ehci_root_open,
.close = ehci_root_close,
.enable = ehci_root_enable,
.disable = ehci_root_disable,
.speed = ehci_root_speed,
.clear_tt = ehci_root_clear_tt,
},
};
/**
* Probe PCI device
*
* @v pci PCI device
* @ret rc Return status code
*/
static int ehci_probe ( struct pci_device *pci ) {
struct ehci_device *ehci;
struct usb_port *port;
unsigned long bar_start;
size_t bar_size;
unsigned int i;
int rc;
/* Allocate and initialise structure */
ehci = zalloc ( sizeof ( *ehci ) );
if ( ! ehci ) {
rc = -ENOMEM;
goto err_alloc;
}
ehci->name = pci->dev.name;
INIT_LIST_HEAD ( &ehci->endpoints );
INIT_LIST_HEAD ( &ehci->async );
INIT_LIST_HEAD ( &ehci->periodic );
/* Fix up PCI device */
adjust_pci_device ( pci );
/* Map registers */
bar_start = pci_bar_start ( pci, EHCI_BAR );
bar_size = pci_bar_size ( pci, EHCI_BAR );
ehci->regs = ioremap ( bar_start, bar_size );
if ( ! ehci->regs ) {
rc = -ENODEV;
goto err_ioremap;
}
/* Initialise EHCI device */
ehci_init ( ehci, ehci->regs );
/* Initialise USB legacy support and claim ownership */
ehci_legacy_init ( ehci, pci );
ehci_legacy_claim ( ehci, pci );
/* Reset device */
if ( ( rc = ehci_reset ( ehci ) ) != 0 )
goto err_reset;
/* Allocate USB bus */
ehci->bus = alloc_usb_bus ( &pci->dev, ehci->ports, EHCI_MTU,
&ehci_operations );
if ( ! ehci->bus ) {
rc = -ENOMEM;
goto err_alloc_bus;
}
usb_bus_set_hostdata ( ehci->bus, ehci );
usb_hub_set_drvdata ( ehci->bus->hub, ehci );
/* Set port protocols */
for ( i = 1 ; i <= ehci->ports ; i++ ) {
port = usb_port ( ehci->bus->hub, i );
port->protocol = USB_PROTO_2_0;
}
/* Register USB bus */
if ( ( rc = register_usb_bus ( ehci->bus ) ) != 0 )
goto err_register;
pci_set_drvdata ( pci, ehci );
return 0;
unregister_usb_bus ( ehci->bus );
err_register:
free_usb_bus ( ehci->bus );
err_alloc_bus:
ehci_reset ( ehci );
err_reset:
ehci_legacy_release ( ehci, pci );
iounmap ( ehci->regs );
err_ioremap:
free ( ehci );
err_alloc:
return rc;
}
/**
* Remove PCI device
*
* @v pci PCI device
*/
static void ehci_remove ( struct pci_device *pci ) {
struct ehci_device *ehci = pci_get_drvdata ( pci );
struct usb_bus *bus = ehci->bus;
unregister_usb_bus ( bus );
assert ( list_empty ( &ehci->async ) );
assert ( list_empty ( &ehci->periodic ) );
free_usb_bus ( bus );
ehci_reset ( ehci );
ehci_legacy_release ( ehci, pci );
iounmap ( ehci->regs );
free ( ehci );
}
/** EHCI PCI device IDs */
static struct pci_device_id ehci_ids[] = {
PCI_ROM ( 0xffff, 0xffff, "ehci", "EHCI", 0 ),
};
/** EHCI PCI driver */
struct pci_driver ehci_driver __pci_driver = {
.ids = ehci_ids,
.id_count = ( sizeof ( ehci_ids ) / sizeof ( ehci_ids[0] ) ),
.class = PCI_CLASS_ID ( PCI_CLASS_SERIAL, PCI_CLASS_SERIAL_USB,
PCI_CLASS_SERIAL_USB_EHCI ),
.probe = ehci_probe,
.remove = ehci_remove,
};
/**
* Prepare for exit
*
* @v booting System is shutting down for OS boot
*/
static void ehci_shutdown ( int booting ) {
/* If we are shutting down to boot an OS, then prevent the
* release of ownership back to BIOS.
*/
ehci_legacy_prevent_release = booting;
}
/** Startup/shutdown function */
struct startup_fn ehci_startup __startup_fn ( STARTUP_LATE ) = {
.shutdown = ehci_shutdown,
};
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