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OpenCloudOS-Kernel/drivers/usb/host/oxu210hp-hcd.c

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/*
* Copyright (c) 2008 Rodolfo Giometti <giometti@linux.it>
* Copyright (c) 2008 Eurotech S.p.A. <info@eurtech.it>
*
* This code is *strongly* based on EHCI-HCD code by David Brownell since
* the chip is a quasi-EHCI compatible.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/dmapool.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/usb.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include "../core/hcd.h"
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/unaligned.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include "oxu210hp.h"
#define DRIVER_VERSION "0.0.50"
/*
* Main defines
*/
#define oxu_dbg(oxu, fmt, args...) \
dev_dbg(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
#define oxu_err(oxu, fmt, args...) \
dev_err(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
#define oxu_info(oxu, fmt, args...) \
dev_info(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
static inline struct usb_hcd *oxu_to_hcd(struct oxu_hcd *oxu)
{
return container_of((void *) oxu, struct usb_hcd, hcd_priv);
}
static inline struct oxu_hcd *hcd_to_oxu(struct usb_hcd *hcd)
{
return (struct oxu_hcd *) (hcd->hcd_priv);
}
/*
* Debug stuff
*/
#undef OXU_URB_TRACE
#undef OXU_VERBOSE_DEBUG
#ifdef OXU_VERBOSE_DEBUG
#define oxu_vdbg oxu_dbg
#else
#define oxu_vdbg(oxu, fmt, args...) /* Nop */
#endif
#ifdef DEBUG
static int __attribute__((__unused__))
dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
{
return scnprintf(buf, len, "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
label, label[0] ? " " : "", status,
(status & STS_ASS) ? " Async" : "",
(status & STS_PSS) ? " Periodic" : "",
(status & STS_RECL) ? " Recl" : "",
(status & STS_HALT) ? " Halt" : "",
(status & STS_IAA) ? " IAA" : "",
(status & STS_FATAL) ? " FATAL" : "",
(status & STS_FLR) ? " FLR" : "",
(status & STS_PCD) ? " PCD" : "",
(status & STS_ERR) ? " ERR" : "",
(status & STS_INT) ? " INT" : ""
);
}
static int __attribute__((__unused__))
dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
{
return scnprintf(buf, len, "%s%sintrenable %02x%s%s%s%s%s%s",
label, label[0] ? " " : "", enable,
(enable & STS_IAA) ? " IAA" : "",
(enable & STS_FATAL) ? " FATAL" : "",
(enable & STS_FLR) ? " FLR" : "",
(enable & STS_PCD) ? " PCD" : "",
(enable & STS_ERR) ? " ERR" : "",
(enable & STS_INT) ? " INT" : ""
);
}
static const char *const fls_strings[] =
{ "1024", "512", "256", "??" };
static int dbg_command_buf(char *buf, unsigned len,
const char *label, u32 command)
{
return scnprintf(buf, len,
"%s%scommand %06x %s=%d ithresh=%d%s%s%s%s period=%s%s %s",
label, label[0] ? " " : "", command,
(command & CMD_PARK) ? "park" : "(park)",
CMD_PARK_CNT(command),
(command >> 16) & 0x3f,
(command & CMD_LRESET) ? " LReset" : "",
(command & CMD_IAAD) ? " IAAD" : "",
(command & CMD_ASE) ? " Async" : "",
(command & CMD_PSE) ? " Periodic" : "",
fls_strings[(command >> 2) & 0x3],
(command & CMD_RESET) ? " Reset" : "",
(command & CMD_RUN) ? "RUN" : "HALT"
);
}
static int dbg_port_buf(char *buf, unsigned len, const char *label,
int port, u32 status)
{
char *sig;
/* signaling state */
switch (status & (3 << 10)) {
case 0 << 10:
sig = "se0";
break;
case 1 << 10:
sig = "k"; /* low speed */
break;
case 2 << 10:
sig = "j";
break;
default:
sig = "?";
break;
}
return scnprintf(buf, len,
"%s%sport %d status %06x%s%s sig=%s%s%s%s%s%s%s%s%s%s",
label, label[0] ? " " : "", port, status,
(status & PORT_POWER) ? " POWER" : "",
(status & PORT_OWNER) ? " OWNER" : "",
sig,
(status & PORT_RESET) ? " RESET" : "",
(status & PORT_SUSPEND) ? " SUSPEND" : "",
(status & PORT_RESUME) ? " RESUME" : "",
(status & PORT_OCC) ? " OCC" : "",
(status & PORT_OC) ? " OC" : "",
(status & PORT_PEC) ? " PEC" : "",
(status & PORT_PE) ? " PE" : "",
(status & PORT_CSC) ? " CSC" : "",
(status & PORT_CONNECT) ? " CONNECT" : ""
);
}
#else
static inline int __attribute__((__unused__))
dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
{ return 0; }
static inline int __attribute__((__unused__))
dbg_command_buf(char *buf, unsigned len, const char *label, u32 command)
{ return 0; }
static inline int __attribute__((__unused__))
dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
{ return 0; }
static inline int __attribute__((__unused__))
dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status)
{ return 0; }
#endif /* DEBUG */
/* functions have the "wrong" filename when they're output... */
#define dbg_status(oxu, label, status) { \
char _buf[80]; \
dbg_status_buf(_buf, sizeof _buf, label, status); \
oxu_dbg(oxu, "%s\n", _buf); \
}
#define dbg_cmd(oxu, label, command) { \
char _buf[80]; \
dbg_command_buf(_buf, sizeof _buf, label, command); \
oxu_dbg(oxu, "%s\n", _buf); \
}
#define dbg_port(oxu, label, port, status) { \
char _buf[80]; \
dbg_port_buf(_buf, sizeof _buf, label, port, status); \
oxu_dbg(oxu, "%s\n", _buf); \
}
/*
* Module parameters
*/
/* Initial IRQ latency: faster than hw default */
static int log2_irq_thresh; /* 0 to 6 */
module_param(log2_irq_thresh, int, S_IRUGO);
MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
/* Initial park setting: slower than hw default */
static unsigned park;
module_param(park, uint, S_IRUGO);
MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets");
/* For flakey hardware, ignore overcurrent indicators */
static int ignore_oc;
module_param(ignore_oc, bool, S_IRUGO);
MODULE_PARM_DESC(ignore_oc, "ignore bogus hardware overcurrent indications");
static void ehci_work(struct oxu_hcd *oxu);
static int oxu_hub_control(struct usb_hcd *hcd,
u16 typeReq, u16 wValue, u16 wIndex,
char *buf, u16 wLength);
/*
* Local functions
*/
/* Low level read/write registers functions */
static inline u32 oxu_readl(void *base, u32 reg)
{
return readl(base + reg);
}
static inline void oxu_writel(void *base, u32 reg, u32 val)
{
writel(val, base + reg);
}
static inline void timer_action_done(struct oxu_hcd *oxu,
enum ehci_timer_action action)
{
clear_bit(action, &oxu->actions);
}
static inline void timer_action(struct oxu_hcd *oxu,
enum ehci_timer_action action)
{
if (!test_and_set_bit(action, &oxu->actions)) {
unsigned long t;
switch (action) {
case TIMER_IAA_WATCHDOG:
t = EHCI_IAA_JIFFIES;
break;
case TIMER_IO_WATCHDOG:
t = EHCI_IO_JIFFIES;
break;
case TIMER_ASYNC_OFF:
t = EHCI_ASYNC_JIFFIES;
break;
case TIMER_ASYNC_SHRINK:
default:
t = EHCI_SHRINK_JIFFIES;
break;
}
t += jiffies;
/* all timings except IAA watchdog can be overridden.
* async queue SHRINK often precedes IAA. while it's ready
* to go OFF neither can matter, and afterwards the IO
* watchdog stops unless there's still periodic traffic.
*/
if (action != TIMER_IAA_WATCHDOG
&& t > oxu->watchdog.expires
&& timer_pending(&oxu->watchdog))
return;
mod_timer(&oxu->watchdog, t);
}
}
/*
* handshake - spin reading hc until handshake completes or fails
* @ptr: address of hc register to be read
* @mask: bits to look at in result of read
* @done: value of those bits when handshake succeeds
* @usec: timeout in microseconds
*
* Returns negative errno, or zero on success
*
* Success happens when the "mask" bits have the specified value (hardware
* handshake done). There are two failure modes: "usec" have passed (major
* hardware flakeout), or the register reads as all-ones (hardware removed).
*
* That last failure should_only happen in cases like physical cardbus eject
* before driver shutdown. But it also seems to be caused by bugs in cardbus
* bridge shutdown: shutting down the bridge before the devices using it.
*/
static int handshake(struct oxu_hcd *oxu, void __iomem *ptr,
u32 mask, u32 done, int usec)
{
u32 result;
do {
result = readl(ptr);
if (result == ~(u32)0) /* card removed */
return -ENODEV;
result &= mask;
if (result == done)
return 0;
udelay(1);
usec--;
} while (usec > 0);
return -ETIMEDOUT;
}
/* Force HC to halt state from unknown (EHCI spec section 2.3) */
static int ehci_halt(struct oxu_hcd *oxu)
{
u32 temp = readl(&oxu->regs->status);
/* disable any irqs left enabled by previous code */
writel(0, &oxu->regs->intr_enable);
if ((temp & STS_HALT) != 0)
return 0;
temp = readl(&oxu->regs->command);
temp &= ~CMD_RUN;
writel(temp, &oxu->regs->command);
return handshake(oxu, &oxu->regs->status,
STS_HALT, STS_HALT, 16 * 125);
}
/* Put TDI/ARC silicon into EHCI mode */
static void tdi_reset(struct oxu_hcd *oxu)
{
u32 __iomem *reg_ptr;
u32 tmp;
reg_ptr = (u32 __iomem *)(((u8 __iomem *)oxu->regs) + 0x68);
tmp = readl(reg_ptr);
tmp |= 0x3;
writel(tmp, reg_ptr);
}
/* Reset a non-running (STS_HALT == 1) controller */
static int ehci_reset(struct oxu_hcd *oxu)
{
int retval;
u32 command = readl(&oxu->regs->command);
command |= CMD_RESET;
dbg_cmd(oxu, "reset", command);
writel(command, &oxu->regs->command);
oxu_to_hcd(oxu)->state = HC_STATE_HALT;
oxu->next_statechange = jiffies;
retval = handshake(oxu, &oxu->regs->command,
CMD_RESET, 0, 250 * 1000);
if (retval)
return retval;
tdi_reset(oxu);
return retval;
}
/* Idle the controller (from running) */
static void ehci_quiesce(struct oxu_hcd *oxu)
{
u32 temp;
#ifdef DEBUG
if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
BUG();
#endif
/* wait for any schedule enables/disables to take effect */
temp = readl(&oxu->regs->command) << 10;
temp &= STS_ASS | STS_PSS;
if (handshake(oxu, &oxu->regs->status, STS_ASS | STS_PSS,
temp, 16 * 125) != 0) {
oxu_to_hcd(oxu)->state = HC_STATE_HALT;
return;
}
/* then disable anything that's still active */
temp = readl(&oxu->regs->command);
temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
writel(temp, &oxu->regs->command);
/* hardware can take 16 microframes to turn off ... */
if (handshake(oxu, &oxu->regs->status, STS_ASS | STS_PSS,
0, 16 * 125) != 0) {
oxu_to_hcd(oxu)->state = HC_STATE_HALT;
return;
}
}
static int check_reset_complete(struct oxu_hcd *oxu, int index,
u32 __iomem *status_reg, int port_status)
{
if (!(port_status & PORT_CONNECT)) {
oxu->reset_done[index] = 0;
return port_status;
}
/* if reset finished and it's still not enabled -- handoff */
if (!(port_status & PORT_PE)) {
oxu_dbg(oxu, "Failed to enable port %d on root hub TT\n",
index+1);
return port_status;
} else
oxu_dbg(oxu, "port %d high speed\n", index + 1);
return port_status;
}
static void ehci_hub_descriptor(struct oxu_hcd *oxu,
struct usb_hub_descriptor *desc)
{
int ports = HCS_N_PORTS(oxu->hcs_params);
u16 temp;
desc->bDescriptorType = 0x29;
desc->bPwrOn2PwrGood = 10; /* oxu 1.0, 2.3.9 says 20ms max */
desc->bHubContrCurrent = 0;
desc->bNbrPorts = ports;
temp = 1 + (ports / 8);
desc->bDescLength = 7 + 2 * temp;
/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
memset(&desc->bitmap[0], 0, temp);
memset(&desc->bitmap[temp], 0xff, temp);
temp = 0x0008; /* per-port overcurrent reporting */
if (HCS_PPC(oxu->hcs_params))
temp |= 0x0001; /* per-port power control */
else
temp |= 0x0002; /* no power switching */
desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
}
/* Allocate an OXU210HP on-chip memory data buffer
*
* An on-chip memory data buffer is required for each OXU210HP USB transfer.
* Each transfer descriptor has one or more on-chip memory data buffers.
*
* Data buffers are allocated from a fix sized pool of data blocks.
* To minimise fragmentation and give reasonable memory utlisation,
* data buffers are allocated with sizes the power of 2 multiples of
* the block size, starting on an address a multiple of the allocated size.
*
* FIXME: callers of this function require a buffer to be allocated for
* len=0. This is a waste of on-chip memory and should be fix. Then this
* function should be changed to not allocate a buffer for len=0.
*/
static int oxu_buf_alloc(struct oxu_hcd *oxu, struct ehci_qtd *qtd, int len)
{
int n_blocks; /* minium blocks needed to hold len */
int a_blocks; /* blocks allocated */
int i, j;
/* Don't allocte bigger than supported */
if (len > BUFFER_SIZE * BUFFER_NUM) {
oxu_err(oxu, "buffer too big (%d)\n", len);
return -ENOMEM;
}
spin_lock(&oxu->mem_lock);
/* Number of blocks needed to hold len */
n_blocks = (len + BUFFER_SIZE - 1) / BUFFER_SIZE;
/* Round the number of blocks up to the power of 2 */
for (a_blocks = 1; a_blocks < n_blocks; a_blocks <<= 1)
;
/* Find a suitable available data buffer */
for (i = 0; i < BUFFER_NUM;
i += max(a_blocks, (int)oxu->db_used[i])) {
/* Check all the required blocks are available */
for (j = 0; j < a_blocks; j++)
if (oxu->db_used[i + j])
break;
if (j != a_blocks)
continue;
/* Allocate blocks found! */
qtd->buffer = (void *) &oxu->mem->db_pool[i];
qtd->buffer_dma = virt_to_phys(qtd->buffer);
qtd->qtd_buffer_len = BUFFER_SIZE * a_blocks;
oxu->db_used[i] = a_blocks;
spin_unlock(&oxu->mem_lock);
return 0;
}
/* Failed */
spin_unlock(&oxu->mem_lock);
return -ENOMEM;
}
static void oxu_buf_free(struct oxu_hcd *oxu, struct ehci_qtd *qtd)
{
int index;
spin_lock(&oxu->mem_lock);
index = (qtd->buffer - (void *) &oxu->mem->db_pool[0])
/ BUFFER_SIZE;
oxu->db_used[index] = 0;
qtd->qtd_buffer_len = 0;
qtd->buffer_dma = 0;
qtd->buffer = NULL;
spin_unlock(&oxu->mem_lock);
return;
}
static inline void ehci_qtd_init(struct ehci_qtd *qtd, dma_addr_t dma)
{
memset(qtd, 0, sizeof *qtd);
qtd->qtd_dma = dma;
qtd->hw_token = cpu_to_le32(QTD_STS_HALT);
qtd->hw_next = EHCI_LIST_END;
qtd->hw_alt_next = EHCI_LIST_END;
INIT_LIST_HEAD(&qtd->qtd_list);
}
static inline void oxu_qtd_free(struct oxu_hcd *oxu, struct ehci_qtd *qtd)
{
int index;
if (qtd->buffer)
oxu_buf_free(oxu, qtd);
spin_lock(&oxu->mem_lock);
index = qtd - &oxu->mem->qtd_pool[0];
oxu->qtd_used[index] = 0;
spin_unlock(&oxu->mem_lock);
return;
}
static struct ehci_qtd *ehci_qtd_alloc(struct oxu_hcd *oxu)
{
int i;
struct ehci_qtd *qtd = NULL;
spin_lock(&oxu->mem_lock);
for (i = 0; i < QTD_NUM; i++)
if (!oxu->qtd_used[i])
break;
if (i < QTD_NUM) {
qtd = (struct ehci_qtd *) &oxu->mem->qtd_pool[i];
memset(qtd, 0, sizeof *qtd);
qtd->hw_token = cpu_to_le32(QTD_STS_HALT);
qtd->hw_next = EHCI_LIST_END;
qtd->hw_alt_next = EHCI_LIST_END;
INIT_LIST_HEAD(&qtd->qtd_list);
qtd->qtd_dma = virt_to_phys(qtd);
oxu->qtd_used[i] = 1;
}
spin_unlock(&oxu->mem_lock);
return qtd;
}
static void oxu_qh_free(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
int index;
spin_lock(&oxu->mem_lock);
index = qh - &oxu->mem->qh_pool[0];
oxu->qh_used[index] = 0;
spin_unlock(&oxu->mem_lock);
return;
}
static void qh_destroy(struct kref *kref)
{
struct ehci_qh *qh = container_of(kref, struct ehci_qh, kref);
struct oxu_hcd *oxu = qh->oxu;
/* clean qtds first, and know this is not linked */
if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) {
oxu_dbg(oxu, "unused qh not empty!\n");
BUG();
}
if (qh->dummy)
oxu_qtd_free(oxu, qh->dummy);
oxu_qh_free(oxu, qh);
}
static struct ehci_qh *oxu_qh_alloc(struct oxu_hcd *oxu)
{
int i;
struct ehci_qh *qh = NULL;
spin_lock(&oxu->mem_lock);
for (i = 0; i < QHEAD_NUM; i++)
if (!oxu->qh_used[i])
break;
if (i < QHEAD_NUM) {
qh = (struct ehci_qh *) &oxu->mem->qh_pool[i];
memset(qh, 0, sizeof *qh);
kref_init(&qh->kref);
qh->oxu = oxu;
qh->qh_dma = virt_to_phys(qh);
INIT_LIST_HEAD(&qh->qtd_list);
/* dummy td enables safe urb queuing */
qh->dummy = ehci_qtd_alloc(oxu);
if (qh->dummy == NULL) {
oxu_dbg(oxu, "no dummy td\n");
oxu->qh_used[i] = 0;
return NULL;
}
oxu->qh_used[i] = 1;
}
spin_unlock(&oxu->mem_lock);
return qh;
}
/* to share a qh (cpu threads, or hc) */
static inline struct ehci_qh *qh_get(struct ehci_qh *qh)
{
kref_get(&qh->kref);
return qh;
}
static inline void qh_put(struct ehci_qh *qh)
{
kref_put(&qh->kref, qh_destroy);
}
static void oxu_murb_free(struct oxu_hcd *oxu, struct oxu_murb *murb)
{
int index;
spin_lock(&oxu->mem_lock);
index = murb - &oxu->murb_pool[0];
oxu->murb_used[index] = 0;
spin_unlock(&oxu->mem_lock);
return;
}
static struct oxu_murb *oxu_murb_alloc(struct oxu_hcd *oxu)
{
int i;
struct oxu_murb *murb = NULL;
spin_lock(&oxu->mem_lock);
for (i = 0; i < MURB_NUM; i++)
if (!oxu->murb_used[i])
break;
if (i < MURB_NUM) {
murb = &(oxu->murb_pool)[i];
oxu->murb_used[i] = 1;
}
spin_unlock(&oxu->mem_lock);
return murb;
}
/* The queue heads and transfer descriptors are managed from pools tied
* to each of the "per device" structures.
* This is the initialisation and cleanup code.
*/
static void ehci_mem_cleanup(struct oxu_hcd *oxu)
{
kfree(oxu->murb_pool);
oxu->murb_pool = NULL;
if (oxu->async)
qh_put(oxu->async);
oxu->async = NULL;
del_timer(&oxu->urb_timer);
oxu->periodic = NULL;
/* shadow periodic table */
kfree(oxu->pshadow);
oxu->pshadow = NULL;
}
/* Remember to add cleanup code (above) if you add anything here.
*/
static int ehci_mem_init(struct oxu_hcd *oxu, gfp_t flags)
{
int i;
for (i = 0; i < oxu->periodic_size; i++)
oxu->mem->frame_list[i] = EHCI_LIST_END;
for (i = 0; i < QHEAD_NUM; i++)
oxu->qh_used[i] = 0;
for (i = 0; i < QTD_NUM; i++)
oxu->qtd_used[i] = 0;
oxu->murb_pool = kcalloc(MURB_NUM, sizeof(struct oxu_murb), flags);
if (!oxu->murb_pool)
goto fail;
for (i = 0; i < MURB_NUM; i++)
oxu->murb_used[i] = 0;
oxu->async = oxu_qh_alloc(oxu);
if (!oxu->async)
goto fail;
oxu->periodic = (__le32 *) &oxu->mem->frame_list;
oxu->periodic_dma = virt_to_phys(oxu->periodic);
for (i = 0; i < oxu->periodic_size; i++)
oxu->periodic[i] = EHCI_LIST_END;
/* software shadow of hardware table */
oxu->pshadow = kcalloc(oxu->periodic_size, sizeof(void *), flags);
if (oxu->pshadow != NULL)
return 0;
fail:
oxu_dbg(oxu, "couldn't init memory\n");
ehci_mem_cleanup(oxu);
return -ENOMEM;
}
/* Fill a qtd, returning how much of the buffer we were able to queue up.
*/
static int qtd_fill(struct ehci_qtd *qtd, dma_addr_t buf, size_t len,
int token, int maxpacket)
{
int i, count;
u64 addr = buf;
/* one buffer entry per 4K ... first might be short or unaligned */
qtd->hw_buf[0] = cpu_to_le32((u32)addr);
qtd->hw_buf_hi[0] = cpu_to_le32((u32)(addr >> 32));
count = 0x1000 - (buf & 0x0fff); /* rest of that page */
if (likely(len < count)) /* ... iff needed */
count = len;
else {
buf += 0x1000;
buf &= ~0x0fff;
/* per-qtd limit: from 16K to 20K (best alignment) */
for (i = 1; count < len && i < 5; i++) {
addr = buf;
qtd->hw_buf[i] = cpu_to_le32((u32)addr);
qtd->hw_buf_hi[i] = cpu_to_le32((u32)(addr >> 32));
buf += 0x1000;
if ((count + 0x1000) < len)
count += 0x1000;
else
count = len;
}
/* short packets may only terminate transfers */
if (count != len)
count -= (count % maxpacket);
}
qtd->hw_token = cpu_to_le32((count << 16) | token);
qtd->length = count;
return count;
}
static inline void qh_update(struct oxu_hcd *oxu,
struct ehci_qh *qh, struct ehci_qtd *qtd)
{
/* writes to an active overlay are unsafe */
BUG_ON(qh->qh_state != QH_STATE_IDLE);
qh->hw_qtd_next = QTD_NEXT(qtd->qtd_dma);
qh->hw_alt_next = EHCI_LIST_END;
/* Except for control endpoints, we make hardware maintain data
* toggle (like OHCI) ... here (re)initialize the toggle in the QH,
* and set the pseudo-toggle in udev. Only usb_clear_halt() will
* ever clear it.
*/
if (!(qh->hw_info1 & cpu_to_le32(1 << 14))) {
unsigned is_out, epnum;
is_out = !(qtd->hw_token & cpu_to_le32(1 << 8));
epnum = (le32_to_cpup(&qh->hw_info1) >> 8) & 0x0f;
if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) {
qh->hw_token &= ~__constant_cpu_to_le32(QTD_TOGGLE);
usb_settoggle(qh->dev, epnum, is_out, 1);
}
}
/* HC must see latest qtd and qh data before we clear ACTIVE+HALT */
wmb();
qh->hw_token &= __constant_cpu_to_le32(QTD_TOGGLE | QTD_STS_PING);
}
/* If it weren't for a common silicon quirk (writing the dummy into the qh
* overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
* recovery (including urb dequeue) would need software changes to a QH...
*/
static void qh_refresh(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
struct ehci_qtd *qtd;
if (list_empty(&qh->qtd_list))
qtd = qh->dummy;
else {
qtd = list_entry(qh->qtd_list.next,
struct ehci_qtd, qtd_list);
/* first qtd may already be partially processed */
if (cpu_to_le32(qtd->qtd_dma) == qh->hw_current)
qtd = NULL;
}
if (qtd)
qh_update(oxu, qh, qtd);
}
static void qtd_copy_status(struct oxu_hcd *oxu, struct urb *urb,
size_t length, u32 token)
{
/* count IN/OUT bytes, not SETUP (even short packets) */
if (likely(QTD_PID(token) != 2))
urb->actual_length += length - QTD_LENGTH(token);
/* don't modify error codes */
if (unlikely(urb->status != -EINPROGRESS))
return;
/* force cleanup after short read; not always an error */
if (unlikely(IS_SHORT_READ(token)))
urb->status = -EREMOTEIO;
/* serious "can't proceed" faults reported by the hardware */
if (token & QTD_STS_HALT) {
if (token & QTD_STS_BABBLE) {
/* FIXME "must" disable babbling device's port too */
urb->status = -EOVERFLOW;
} else if (token & QTD_STS_MMF) {
/* fs/ls interrupt xfer missed the complete-split */
urb->status = -EPROTO;
} else if (token & QTD_STS_DBE) {
urb->status = (QTD_PID(token) == 1) /* IN ? */
? -ENOSR /* hc couldn't read data */
: -ECOMM; /* hc couldn't write data */
} else if (token & QTD_STS_XACT) {
/* timeout, bad crc, wrong PID, etc; retried */
if (QTD_CERR(token))
urb->status = -EPIPE;
else {
oxu_dbg(oxu, "devpath %s ep%d%s 3strikes\n",
urb->dev->devpath,
usb_pipeendpoint(urb->pipe),
usb_pipein(urb->pipe) ? "in" : "out");
urb->status = -EPROTO;
}
/* CERR nonzero + no errors + halt --> stall */
} else if (QTD_CERR(token))
urb->status = -EPIPE;
else /* unknown */
urb->status = -EPROTO;
oxu_vdbg(oxu, "dev%d ep%d%s qtd token %08x --> status %d\n",
usb_pipedevice(urb->pipe),
usb_pipeendpoint(urb->pipe),
usb_pipein(urb->pipe) ? "in" : "out",
token, urb->status);
}
}
static void ehci_urb_done(struct oxu_hcd *oxu, struct urb *urb)
__releases(oxu->lock)
__acquires(oxu->lock)
{
if (likely(urb->hcpriv != NULL)) {
struct ehci_qh *qh = (struct ehci_qh *) urb->hcpriv;
/* S-mask in a QH means it's an interrupt urb */
if ((qh->hw_info2 & __constant_cpu_to_le32(QH_SMASK)) != 0) {
/* ... update hc-wide periodic stats (for usbfs) */
oxu_to_hcd(oxu)->self.bandwidth_int_reqs--;
}
qh_put(qh);
}
urb->hcpriv = NULL;
switch (urb->status) {
case -EINPROGRESS: /* success */
urb->status = 0;
default: /* fault */
break;
case -EREMOTEIO: /* fault or normal */
if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
urb->status = 0;
break;
case -ECONNRESET: /* canceled */
case -ENOENT:
break;
}
#ifdef OXU_URB_TRACE
oxu_dbg(oxu, "%s %s urb %p ep%d%s status %d len %d/%d\n",
__func__, urb->dev->devpath, urb,
usb_pipeendpoint(urb->pipe),
usb_pipein(urb->pipe) ? "in" : "out",
urb->status,
urb->actual_length, urb->transfer_buffer_length);
#endif
/* complete() can reenter this HCD */
spin_unlock(&oxu->lock);
usb_hcd_giveback_urb(oxu_to_hcd(oxu), urb, urb->status);
spin_lock(&oxu->lock);
}
static void start_unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh);
static void unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh);
static void intr_deschedule(struct oxu_hcd *oxu, struct ehci_qh *qh);
static int qh_schedule(struct oxu_hcd *oxu, struct ehci_qh *qh);
#define HALT_BIT __constant_cpu_to_le32(QTD_STS_HALT)
/* Process and free completed qtds for a qh, returning URBs to drivers.
* Chases up to qh->hw_current. Returns number of completions called,
* indicating how much "real" work we did.
*/
static unsigned qh_completions(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
struct ehci_qtd *last = NULL, *end = qh->dummy;
struct list_head *entry, *tmp;
int stopped;
unsigned count = 0;
int do_status = 0;
u8 state;
struct oxu_murb *murb = NULL;
if (unlikely(list_empty(&qh->qtd_list)))
return count;
/* completions (or tasks on other cpus) must never clobber HALT
* till we've gone through and cleaned everything up, even when
* they add urbs to this qh's queue or mark them for unlinking.
*
* NOTE: unlinking expects to be done in queue order.
*/
state = qh->qh_state;
qh->qh_state = QH_STATE_COMPLETING;
stopped = (state == QH_STATE_IDLE);
/* remove de-activated QTDs from front of queue.
* after faults (including short reads), cleanup this urb
* then let the queue advance.
* if queue is stopped, handles unlinks.
*/
list_for_each_safe(entry, tmp, &qh->qtd_list) {
struct ehci_qtd *qtd;
struct urb *urb;
u32 token = 0;
qtd = list_entry(entry, struct ehci_qtd, qtd_list);
urb = qtd->urb;
/* Clean up any state from previous QTD ...*/
if (last) {
if (likely(last->urb != urb)) {
if (last->urb->complete == NULL) {
murb = (struct oxu_murb *) last->urb;
last->urb = murb->main;
if (murb->last) {
ehci_urb_done(oxu, last->urb);
count++;
}
oxu_murb_free(oxu, murb);
} else {
ehci_urb_done(oxu, last->urb);
count++;
}
}
oxu_qtd_free(oxu, last);
last = NULL;
}
/* ignore urbs submitted during completions we reported */
if (qtd == end)
break;
/* hardware copies qtd out of qh overlay */
rmb();
token = le32_to_cpu(qtd->hw_token);
/* always clean up qtds the hc de-activated */
if ((token & QTD_STS_ACTIVE) == 0) {
if ((token & QTD_STS_HALT) != 0) {
stopped = 1;
/* magic dummy for some short reads; qh won't advance.
* that silicon quirk can kick in with this dummy too.
*/
} else if (IS_SHORT_READ(token) &&
!(qtd->hw_alt_next & EHCI_LIST_END)) {
stopped = 1;
goto halt;
}
/* stop scanning when we reach qtds the hc is using */
} else if (likely(!stopped &&
HC_IS_RUNNING(oxu_to_hcd(oxu)->state))) {
break;
} else {
stopped = 1;
if (unlikely(!HC_IS_RUNNING(oxu_to_hcd(oxu)->state)))
urb->status = -ESHUTDOWN;
/* ignore active urbs unless some previous qtd
* for the urb faulted (including short read) or
* its urb was canceled. we may patch qh or qtds.
*/
if (likely(urb->status == -EINPROGRESS))
continue;
/* issue status after short control reads */
if (unlikely(do_status != 0)
&& QTD_PID(token) == 0 /* OUT */) {
do_status = 0;
continue;
}
/* token in overlay may be most current */
if (state == QH_STATE_IDLE
&& cpu_to_le32(qtd->qtd_dma)
== qh->hw_current)
token = le32_to_cpu(qh->hw_token);
/* force halt for unlinked or blocked qh, so we'll
* patch the qh later and so that completions can't
* activate it while we "know" it's stopped.
*/
if ((HALT_BIT & qh->hw_token) == 0) {
halt:
qh->hw_token |= HALT_BIT;
wmb();
}
}
/* Remove it from the queue */
qtd_copy_status(oxu, urb->complete ?
urb : ((struct oxu_murb *) urb)->main,
qtd->length, token);
if ((usb_pipein(qtd->urb->pipe)) &&
(NULL != qtd->transfer_buffer))
memcpy(qtd->transfer_buffer, qtd->buffer, qtd->length);
do_status = (urb->status == -EREMOTEIO)
&& usb_pipecontrol(urb->pipe);
if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
last = list_entry(qtd->qtd_list.prev,
struct ehci_qtd, qtd_list);
last->hw_next = qtd->hw_next;
}
list_del(&qtd->qtd_list);
last = qtd;
}
/* last urb's completion might still need calling */
if (likely(last != NULL)) {
if (last->urb->complete == NULL) {
murb = (struct oxu_murb *) last->urb;
last->urb = murb->main;
if (murb->last) {
ehci_urb_done(oxu, last->urb);
count++;
}
oxu_murb_free(oxu, murb);
} else {
ehci_urb_done(oxu, last->urb);
count++;
}
oxu_qtd_free(oxu, last);
}
/* restore original state; caller must unlink or relink */
qh->qh_state = state;
/* be sure the hardware's done with the qh before refreshing
* it after fault cleanup, or recovering from silicon wrongly
* overlaying the dummy qtd (which reduces DMA chatter).
*/
if (stopped != 0 || qh->hw_qtd_next == EHCI_LIST_END) {
switch (state) {
case QH_STATE_IDLE:
qh_refresh(oxu, qh);
break;
case QH_STATE_LINKED:
/* should be rare for periodic transfers,
* except maybe high bandwidth ...
*/
if ((__constant_cpu_to_le32(QH_SMASK)
& qh->hw_info2) != 0) {
intr_deschedule(oxu, qh);
(void) qh_schedule(oxu, qh);
} else
unlink_async(oxu, qh);
break;
/* otherwise, unlink already started */
}
}
return count;
}
/* High bandwidth multiplier, as encoded in highspeed endpoint descriptors */
#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
/* ... and packet size, for any kind of endpoint descriptor */
#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
/* Reverse of qh_urb_transaction: free a list of TDs.
* used for cleanup after errors, before HC sees an URB's TDs.
*/
static void qtd_list_free(struct oxu_hcd *oxu,
struct urb *urb, struct list_head *qtd_list)
{
struct list_head *entry, *temp;
list_for_each_safe(entry, temp, qtd_list) {
struct ehci_qtd *qtd;
qtd = list_entry(entry, struct ehci_qtd, qtd_list);
list_del(&qtd->qtd_list);
oxu_qtd_free(oxu, qtd);
}
}
/* Create a list of filled qtds for this URB; won't link into qh.
*/
static struct list_head *qh_urb_transaction(struct oxu_hcd *oxu,
struct urb *urb,
struct list_head *head,
gfp_t flags)
{
struct ehci_qtd *qtd, *qtd_prev;
dma_addr_t buf;
int len, maxpacket;
int is_input;
u32 token;
void *transfer_buf = NULL;
int ret;
/*
* URBs map to sequences of QTDs: one logical transaction
*/
qtd = ehci_qtd_alloc(oxu);
if (unlikely(!qtd))
return NULL;
list_add_tail(&qtd->qtd_list, head);
qtd->urb = urb;
token = QTD_STS_ACTIVE;
token |= (EHCI_TUNE_CERR << 10);
/* for split transactions, SplitXState initialized to zero */
len = urb->transfer_buffer_length;
is_input = usb_pipein(urb->pipe);
if (!urb->transfer_buffer && urb->transfer_buffer_length && is_input)
urb->transfer_buffer = phys_to_virt(urb->transfer_dma);
if (usb_pipecontrol(urb->pipe)) {
/* SETUP pid */
ret = oxu_buf_alloc(oxu, qtd, sizeof(struct usb_ctrlrequest));
if (ret)
goto cleanup;
qtd_fill(qtd, qtd->buffer_dma, sizeof(struct usb_ctrlrequest),
token | (2 /* "setup" */ << 8), 8);
memcpy(qtd->buffer, qtd->urb->setup_packet,
sizeof(struct usb_ctrlrequest));
/* ... and always at least one more pid */
token ^= QTD_TOGGLE;
qtd_prev = qtd;
qtd = ehci_qtd_alloc(oxu);
if (unlikely(!qtd))
goto cleanup;
qtd->urb = urb;
qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
list_add_tail(&qtd->qtd_list, head);
/* for zero length DATA stages, STATUS is always IN */
if (len == 0)
token |= (1 /* "in" */ << 8);
}
/*
* Data transfer stage: buffer setup
*/
ret = oxu_buf_alloc(oxu, qtd, len);
if (ret)
goto cleanup;
buf = qtd->buffer_dma;
transfer_buf = urb->transfer_buffer;
if (!is_input)
memcpy(qtd->buffer, qtd->urb->transfer_buffer, len);
if (is_input)
token |= (1 /* "in" */ << 8);
/* else it's already initted to "out" pid (0 << 8) */
maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
/*
* buffer gets wrapped in one or more qtds;
* last one may be "short" (including zero len)
* and may serve as a control status ack
*/
for (;;) {
int this_qtd_len;
this_qtd_len = qtd_fill(qtd, buf, len, token, maxpacket);
qtd->transfer_buffer = transfer_buf;
len -= this_qtd_len;
buf += this_qtd_len;
transfer_buf += this_qtd_len;
if (is_input)
qtd->hw_alt_next = oxu->async->hw_alt_next;
/* qh makes control packets use qtd toggle; maybe switch it */
if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
token ^= QTD_TOGGLE;
if (likely(len <= 0))
break;
qtd_prev = qtd;
qtd = ehci_qtd_alloc(oxu);
if (unlikely(!qtd))
goto cleanup;
if (likely(len > 0)) {
ret = oxu_buf_alloc(oxu, qtd, len);
if (ret)
goto cleanup;
}
qtd->urb = urb;
qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
list_add_tail(&qtd->qtd_list, head);
}
/* unless the bulk/interrupt caller wants a chance to clean
* up after short reads, hc should advance qh past this urb
*/
if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
|| usb_pipecontrol(urb->pipe)))
qtd->hw_alt_next = EHCI_LIST_END;
/*
* control requests may need a terminating data "status" ack;
* bulk ones may need a terminating short packet (zero length).
*/
if (likely(urb->transfer_buffer_length != 0)) {
int one_more = 0;
if (usb_pipecontrol(urb->pipe)) {
one_more = 1;
token ^= 0x0100; /* "in" <--> "out" */
token |= QTD_TOGGLE; /* force DATA1 */
} else if (usb_pipebulk(urb->pipe)
&& (urb->transfer_flags & URB_ZERO_PACKET)
&& !(urb->transfer_buffer_length % maxpacket)) {
one_more = 1;
}
if (one_more) {
qtd_prev = qtd;
qtd = ehci_qtd_alloc(oxu);
if (unlikely(!qtd))
goto cleanup;
qtd->urb = urb;
qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
list_add_tail(&qtd->qtd_list, head);
/* never any data in such packets */
qtd_fill(qtd, 0, 0, token, 0);
}
}
/* by default, enable interrupt on urb completion */
qtd->hw_token |= __constant_cpu_to_le32(QTD_IOC);
return head;
cleanup:
qtd_list_free(oxu, urb, head);
return NULL;
}
/* Each QH holds a qtd list; a QH is used for everything except iso.
*
* For interrupt urbs, the scheduler must set the microframe scheduling
* mask(s) each time the QH gets scheduled. For highspeed, that's
* just one microframe in the s-mask. For split interrupt transactions
* there are additional complications: c-mask, maybe FSTNs.
*/
static struct ehci_qh *qh_make(struct oxu_hcd *oxu,
struct urb *urb, gfp_t flags)
{
struct ehci_qh *qh = oxu_qh_alloc(oxu);
u32 info1 = 0, info2 = 0;
int is_input, type;
int maxp = 0;
if (!qh)
return qh;
/*
* init endpoint/device data for this QH
*/
info1 |= usb_pipeendpoint(urb->pipe) << 8;
info1 |= usb_pipedevice(urb->pipe) << 0;
is_input = usb_pipein(urb->pipe);
type = usb_pipetype(urb->pipe);
maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input);
/* Compute interrupt scheduling parameters just once, and save.
* - allowing for high bandwidth, how many nsec/uframe are used?
* - split transactions need a second CSPLIT uframe; same question
* - splits also need a schedule gap (for full/low speed I/O)
* - qh has a polling interval
*
* For control/bulk requests, the HC or TT handles these.
*/
if (type == PIPE_INTERRUPT) {
qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
is_input, 0,
hb_mult(maxp) * max_packet(maxp)));
qh->start = NO_FRAME;
if (urb->dev->speed == USB_SPEED_HIGH) {
qh->c_usecs = 0;
qh->gap_uf = 0;
qh->period = urb->interval >> 3;
if (qh->period == 0 && urb->interval != 1) {
/* NOTE interval 2 or 4 uframes could work.
* But interval 1 scheduling is simpler, and
* includes high bandwidth.
*/
dbg("intr period %d uframes, NYET!",
urb->interval);
goto done;
}
} else {
struct usb_tt *tt = urb->dev->tt;
int think_time;
/* gap is f(FS/LS transfer times) */
qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed,
is_input, 0, maxp) / (125 * 1000);
/* FIXME this just approximates SPLIT/CSPLIT times */
if (is_input) { /* SPLIT, gap, CSPLIT+DATA */
qh->c_usecs = qh->usecs + HS_USECS(0);
qh->usecs = HS_USECS(1);
} else { /* SPLIT+DATA, gap, CSPLIT */
qh->usecs += HS_USECS(1);
qh->c_usecs = HS_USECS(0);
}
think_time = tt ? tt->think_time : 0;
qh->tt_usecs = NS_TO_US(think_time +
usb_calc_bus_time(urb->dev->speed,
is_input, 0, max_packet(maxp)));
qh->period = urb->interval;
}
}
/* support for tt scheduling, and access to toggles */
qh->dev = urb->dev;
/* using TT? */
switch (urb->dev->speed) {
case USB_SPEED_LOW:
info1 |= (1 << 12); /* EPS "low" */
/* FALL THROUGH */
case USB_SPEED_FULL:
/* EPS 0 means "full" */
if (type != PIPE_INTERRUPT)
info1 |= (EHCI_TUNE_RL_TT << 28);
if (type == PIPE_CONTROL) {
info1 |= (1 << 27); /* for TT */
info1 |= 1 << 14; /* toggle from qtd */
}
info1 |= maxp << 16;
info2 |= (EHCI_TUNE_MULT_TT << 30);
info2 |= urb->dev->ttport << 23;
/* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */
break;
case USB_SPEED_HIGH: /* no TT involved */
info1 |= (2 << 12); /* EPS "high" */
if (type == PIPE_CONTROL) {
info1 |= (EHCI_TUNE_RL_HS << 28);
info1 |= 64 << 16; /* usb2 fixed maxpacket */
info1 |= 1 << 14; /* toggle from qtd */
info2 |= (EHCI_TUNE_MULT_HS << 30);
} else if (type == PIPE_BULK) {
info1 |= (EHCI_TUNE_RL_HS << 28);
info1 |= 512 << 16; /* usb2 fixed maxpacket */
info2 |= (EHCI_TUNE_MULT_HS << 30);
} else { /* PIPE_INTERRUPT */
info1 |= max_packet(maxp) << 16;
info2 |= hb_mult(maxp) << 30;
}
break;
default:
dbg("bogus dev %p speed %d", urb->dev, urb->dev->speed);
done:
qh_put(qh);
return NULL;
}
/* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */
/* init as live, toggle clear, advance to dummy */
qh->qh_state = QH_STATE_IDLE;
qh->hw_info1 = cpu_to_le32(info1);
qh->hw_info2 = cpu_to_le32(info2);
usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1);
qh_refresh(oxu, qh);
return qh;
}
/* Move qh (and its qtds) onto async queue; maybe enable queue.
*/
static void qh_link_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
__le32 dma = QH_NEXT(qh->qh_dma);
struct ehci_qh *head;
/* (re)start the async schedule? */
head = oxu->async;
timer_action_done(oxu, TIMER_ASYNC_OFF);
if (!head->qh_next.qh) {
u32 cmd = readl(&oxu->regs->command);
if (!(cmd & CMD_ASE)) {
/* in case a clear of CMD_ASE didn't take yet */
(void)handshake(oxu, &oxu->regs->status,
STS_ASS, 0, 150);
cmd |= CMD_ASE | CMD_RUN;
writel(cmd, &oxu->regs->command);
oxu_to_hcd(oxu)->state = HC_STATE_RUNNING;
/* posted write need not be known to HC yet ... */
}
}
/* clear halt and/or toggle; and maybe recover from silicon quirk */
if (qh->qh_state == QH_STATE_IDLE)
qh_refresh(oxu, qh);
/* splice right after start */
qh->qh_next = head->qh_next;
qh->hw_next = head->hw_next;
wmb();
head->qh_next.qh = qh;
head->hw_next = dma;
qh->qh_state = QH_STATE_LINKED;
/* qtd completions reported later by interrupt */
}
#define QH_ADDR_MASK __constant_cpu_to_le32(0x7f)
/*
* For control/bulk/interrupt, return QH with these TDs appended.
* Allocates and initializes the QH if necessary.
* Returns null if it can't allocate a QH it needs to.
* If the QH has TDs (urbs) already, that's great.
*/
static struct ehci_qh *qh_append_tds(struct oxu_hcd *oxu,
struct urb *urb, struct list_head *qtd_list,
int epnum, void **ptr)
{
struct ehci_qh *qh = NULL;
qh = (struct ehci_qh *) *ptr;
if (unlikely(qh == NULL)) {
/* can't sleep here, we have oxu->lock... */
qh = qh_make(oxu, urb, GFP_ATOMIC);
*ptr = qh;
}
if (likely(qh != NULL)) {
struct ehci_qtd *qtd;
if (unlikely(list_empty(qtd_list)))
qtd = NULL;
else
qtd = list_entry(qtd_list->next, struct ehci_qtd,
qtd_list);
/* control qh may need patching ... */
if (unlikely(epnum == 0)) {
/* usb_reset_device() briefly reverts to address 0 */
if (usb_pipedevice(urb->pipe) == 0)
qh->hw_info1 &= ~QH_ADDR_MASK;
}
/* just one way to queue requests: swap with the dummy qtd.
* only hc or qh_refresh() ever modify the overlay.
*/
if (likely(qtd != NULL)) {
struct ehci_qtd *dummy;
dma_addr_t dma;
__le32 token;
/* to avoid racing the HC, use the dummy td instead of
* the first td of our list (becomes new dummy). both
* tds stay deactivated until we're done, when the
* HC is allowed to fetch the old dummy (4.10.2).
*/
token = qtd->hw_token;
qtd->hw_token = HALT_BIT;
wmb();
dummy = qh->dummy;
dma = dummy->qtd_dma;
*dummy = *qtd;
dummy->qtd_dma = dma;
list_del(&qtd->qtd_list);
list_add(&dummy->qtd_list, qtd_list);
list_splice(qtd_list, qh->qtd_list.prev);
ehci_qtd_init(qtd, qtd->qtd_dma);
qh->dummy = qtd;
/* hc must see the new dummy at list end */
dma = qtd->qtd_dma;
qtd = list_entry(qh->qtd_list.prev,
struct ehci_qtd, qtd_list);
qtd->hw_next = QTD_NEXT(dma);
/* let the hc process these next qtds */
dummy->hw_token = (token & ~(0x80));
wmb();
dummy->hw_token = token;
urb->hcpriv = qh_get(qh);
}
}
return qh;
}
static int submit_async(struct oxu_hcd *oxu, struct urb *urb,
struct list_head *qtd_list, gfp_t mem_flags)
{
struct ehci_qtd *qtd;
int epnum;
unsigned long flags;
struct ehci_qh *qh = NULL;
int rc = 0;
qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list);
epnum = urb->ep->desc.bEndpointAddress;
#ifdef OXU_URB_TRACE
oxu_dbg(oxu, "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
__func__, urb->dev->devpath, urb,
epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
urb->transfer_buffer_length,
qtd, urb->ep->hcpriv);
#endif
spin_lock_irqsave(&oxu->lock, flags);
if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
&oxu_to_hcd(oxu)->flags))) {
rc = -ESHUTDOWN;
goto done;
}
qh = qh_append_tds(oxu, urb, qtd_list, epnum, &urb->ep->hcpriv);
if (unlikely(qh == NULL)) {
rc = -ENOMEM;
goto done;
}
/* Control/bulk operations through TTs don't need scheduling,
* the HC and TT handle it when the TT has a buffer ready.
*/
if (likely(qh->qh_state == QH_STATE_IDLE))
qh_link_async(oxu, qh_get(qh));
done:
spin_unlock_irqrestore(&oxu->lock, flags);
if (unlikely(qh == NULL))
qtd_list_free(oxu, urb, qtd_list);
return rc;
}
/* The async qh for the qtds being reclaimed are now unlinked from the HC */
static void end_unlink_async(struct oxu_hcd *oxu)
{
struct ehci_qh *qh = oxu->reclaim;
struct ehci_qh *next;
timer_action_done(oxu, TIMER_IAA_WATCHDOG);
qh->qh_state = QH_STATE_IDLE;
qh->qh_next.qh = NULL;
qh_put(qh); /* refcount from reclaim */
/* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */
next = qh->reclaim;
oxu->reclaim = next;
oxu->reclaim_ready = 0;
qh->reclaim = NULL;
qh_completions(oxu, qh);
if (!list_empty(&qh->qtd_list)
&& HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
qh_link_async(oxu, qh);
else {
qh_put(qh); /* refcount from async list */
/* it's not free to turn the async schedule on/off; leave it
* active but idle for a while once it empties.
*/
if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state)
&& oxu->async->qh_next.qh == NULL)
timer_action(oxu, TIMER_ASYNC_OFF);
}
if (next) {
oxu->reclaim = NULL;
start_unlink_async(oxu, next);
}
}
/* makes sure the async qh will become idle */
/* caller must own oxu->lock */
static void start_unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
int cmd = readl(&oxu->regs->command);
struct ehci_qh *prev;
#ifdef DEBUG
assert_spin_locked(&oxu->lock);
if (oxu->reclaim || (qh->qh_state != QH_STATE_LINKED
&& qh->qh_state != QH_STATE_UNLINK_WAIT))
BUG();
#endif
/* stop async schedule right now? */
if (unlikely(qh == oxu->async)) {
/* can't get here without STS_ASS set */
if (oxu_to_hcd(oxu)->state != HC_STATE_HALT
&& !oxu->reclaim) {
/* ... and CMD_IAAD clear */
writel(cmd & ~CMD_ASE, &oxu->regs->command);
wmb();
/* handshake later, if we need to */
timer_action_done(oxu, TIMER_ASYNC_OFF);
}
return;
}
qh->qh_state = QH_STATE_UNLINK;
oxu->reclaim = qh = qh_get(qh);
prev = oxu->async;
while (prev->qh_next.qh != qh)
prev = prev->qh_next.qh;
prev->hw_next = qh->hw_next;
prev->qh_next = qh->qh_next;
wmb();
if (unlikely(oxu_to_hcd(oxu)->state == HC_STATE_HALT)) {
/* if (unlikely(qh->reclaim != 0))
* this will recurse, probably not much
*/
end_unlink_async(oxu);
return;
}
oxu->reclaim_ready = 0;
cmd |= CMD_IAAD;
writel(cmd, &oxu->regs->command);
(void) readl(&oxu->regs->command);
timer_action(oxu, TIMER_IAA_WATCHDOG);
}
static void scan_async(struct oxu_hcd *oxu)
{
struct ehci_qh *qh;
enum ehci_timer_action action = TIMER_IO_WATCHDOG;
if (!++(oxu->stamp))
oxu->stamp++;
timer_action_done(oxu, TIMER_ASYNC_SHRINK);
rescan:
qh = oxu->async->qh_next.qh;
if (likely(qh != NULL)) {
do {
/* clean any finished work for this qh */
if (!list_empty(&qh->qtd_list)
&& qh->stamp != oxu->stamp) {
int temp;
/* unlinks could happen here; completion
* reporting drops the lock. rescan using
* the latest schedule, but don't rescan
* qhs we already finished (no looping).
*/
qh = qh_get(qh);
qh->stamp = oxu->stamp;
temp = qh_completions(oxu, qh);
qh_put(qh);
if (temp != 0)
goto rescan;
}
/* unlink idle entries, reducing HC PCI usage as well
* as HCD schedule-scanning costs. delay for any qh
* we just scanned, there's a not-unusual case that it
* doesn't stay idle for long.
* (plus, avoids some kind of re-activation race.)
*/
if (list_empty(&qh->qtd_list)) {
if (qh->stamp == oxu->stamp)
action = TIMER_ASYNC_SHRINK;
else if (!oxu->reclaim
&& qh->qh_state == QH_STATE_LINKED)
start_unlink_async(oxu, qh);
}
qh = qh->qh_next.qh;
} while (qh);
}
if (action == TIMER_ASYNC_SHRINK)
timer_action(oxu, TIMER_ASYNC_SHRINK);
}
/*
* periodic_next_shadow - return "next" pointer on shadow list
* @periodic: host pointer to qh/itd/sitd
* @tag: hardware tag for type of this record
*/
static union ehci_shadow *periodic_next_shadow(union ehci_shadow *periodic,
__le32 tag)
{
switch (tag) {
default:
case Q_TYPE_QH:
return &periodic->qh->qh_next;
}
}
/* caller must hold oxu->lock */
static void periodic_unlink(struct oxu_hcd *oxu, unsigned frame, void *ptr)
{
union ehci_shadow *prev_p = &oxu->pshadow[frame];
__le32 *hw_p = &oxu->periodic[frame];
union ehci_shadow here = *prev_p;
/* find predecessor of "ptr"; hw and shadow lists are in sync */
while (here.ptr && here.ptr != ptr) {
prev_p = periodic_next_shadow(prev_p, Q_NEXT_TYPE(*hw_p));
hw_p = here.hw_next;
here = *prev_p;
}
/* an interrupt entry (at list end) could have been shared */
if (!here.ptr)
return;
/* update shadow and hardware lists ... the old "next" pointers
* from ptr may still be in use, the caller updates them.
*/
*prev_p = *periodic_next_shadow(&here, Q_NEXT_TYPE(*hw_p));
*hw_p = *here.hw_next;
}
/* how many of the uframe's 125 usecs are allocated? */
static unsigned short periodic_usecs(struct oxu_hcd *oxu,
unsigned frame, unsigned uframe)
{
__le32 *hw_p = &oxu->periodic[frame];
union ehci_shadow *q = &oxu->pshadow[frame];
unsigned usecs = 0;
while (q->ptr) {
switch (Q_NEXT_TYPE(*hw_p)) {
case Q_TYPE_QH:
default:
/* is it in the S-mask? */
if (q->qh->hw_info2 & cpu_to_le32(1 << uframe))
usecs += q->qh->usecs;
/* ... or C-mask? */
if (q->qh->hw_info2 & cpu_to_le32(1 << (8 + uframe)))
usecs += q->qh->c_usecs;
hw_p = &q->qh->hw_next;
q = &q->qh->qh_next;
break;
}
}
#ifdef DEBUG
if (usecs > 100)
oxu_err(oxu, "uframe %d sched overrun: %d usecs\n",
frame * 8 + uframe, usecs);
#endif
return usecs;
}
static int enable_periodic(struct oxu_hcd *oxu)
{
u32 cmd;
int status;
/* did clearing PSE did take effect yet?
* takes effect only at frame boundaries...
*/
status = handshake(oxu, &oxu->regs->status, STS_PSS, 0, 9 * 125);
if (status != 0) {
oxu_to_hcd(oxu)->state = HC_STATE_HALT;
return status;
}
cmd = readl(&oxu->regs->command) | CMD_PSE;
writel(cmd, &oxu->regs->command);
/* posted write ... PSS happens later */
oxu_to_hcd(oxu)->state = HC_STATE_RUNNING;
/* make sure ehci_work scans these */
oxu->next_uframe = readl(&oxu->regs->frame_index)
% (oxu->periodic_size << 3);
return 0;
}
static int disable_periodic(struct oxu_hcd *oxu)
{
u32 cmd;
int status;
/* did setting PSE not take effect yet?
* takes effect only at frame boundaries...
*/
status = handshake(oxu, &oxu->regs->status, STS_PSS, STS_PSS, 9 * 125);
if (status != 0) {
oxu_to_hcd(oxu)->state = HC_STATE_HALT;
return status;
}
cmd = readl(&oxu->regs->command) & ~CMD_PSE;
writel(cmd, &oxu->regs->command);
/* posted write ... */
oxu->next_uframe = -1;
return 0;
}
/* periodic schedule slots have iso tds (normal or split) first, then a
* sparse tree for active interrupt transfers.
*
* this just links in a qh; caller guarantees uframe masks are set right.
* no FSTN support (yet; oxu 0.96+)
*/
static int qh_link_periodic(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
unsigned i;
unsigned period = qh->period;
dev_dbg(&qh->dev->dev,
"link qh%d-%04x/%p start %d [%d/%d us]\n",
period, le32_to_cpup(&qh->hw_info2) & (QH_CMASK | QH_SMASK),
qh, qh->start, qh->usecs, qh->c_usecs);
/* high bandwidth, or otherwise every microframe */
if (period == 0)
period = 1;
for (i = qh->start; i < oxu->periodic_size; i += period) {
union ehci_shadow *prev = &oxu->pshadow[i];
__le32 *hw_p = &oxu->periodic[i];
union ehci_shadow here = *prev;
__le32 type = 0;
/* skip the iso nodes at list head */
while (here.ptr) {
type = Q_NEXT_TYPE(*hw_p);
if (type == Q_TYPE_QH)
break;
prev = periodic_next_shadow(prev, type);
hw_p = &here.qh->hw_next;
here = *prev;
}
/* sorting each branch by period (slow-->fast)
* enables sharing interior tree nodes
*/
while (here.ptr && qh != here.qh) {
if (qh->period > here.qh->period)
break;
prev = &here.qh->qh_next;
hw_p = &here.qh->hw_next;
here = *prev;
}
/* link in this qh, unless some earlier pass did that */
if (qh != here.qh) {
qh->qh_next = here;
if (here.qh)
qh->hw_next = *hw_p;
wmb();
prev->qh = qh;
*hw_p = QH_NEXT(qh->qh_dma);
}
}
qh->qh_state = QH_STATE_LINKED;
qh_get(qh);
/* update per-qh bandwidth for usbfs */
oxu_to_hcd(oxu)->self.bandwidth_allocated += qh->period
? ((qh->usecs + qh->c_usecs) / qh->period)
: (qh->usecs * 8);
/* maybe enable periodic schedule processing */
if (!oxu->periodic_sched++)
return enable_periodic(oxu);
return 0;
}
static void qh_unlink_periodic(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
unsigned i;
unsigned period;
/* FIXME:
* IF this isn't high speed
* and this qh is active in the current uframe
* (and overlay token SplitXstate is false?)
* THEN
* qh->hw_info1 |= __constant_cpu_to_le32(1 << 7 "ignore");
*/
/* high bandwidth, or otherwise part of every microframe */
period = qh->period;
if (period == 0)
period = 1;
for (i = qh->start; i < oxu->periodic_size; i += period)
periodic_unlink(oxu, i, qh);
/* update per-qh bandwidth for usbfs */
oxu_to_hcd(oxu)->self.bandwidth_allocated -= qh->period
? ((qh->usecs + qh->c_usecs) / qh->period)
: (qh->usecs * 8);
dev_dbg(&qh->dev->dev,
"unlink qh%d-%04x/%p start %d [%d/%d us]\n",
qh->period,
le32_to_cpup(&qh->hw_info2) & (QH_CMASK | QH_SMASK),
qh, qh->start, qh->usecs, qh->c_usecs);
/* qh->qh_next still "live" to HC */
qh->qh_state = QH_STATE_UNLINK;
qh->qh_next.ptr = NULL;
qh_put(qh);
/* maybe turn off periodic schedule */
oxu->periodic_sched--;
if (!oxu->periodic_sched)
(void) disable_periodic(oxu);
}
static void intr_deschedule(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
unsigned wait;
qh_unlink_periodic(oxu, qh);
/* simple/paranoid: always delay, expecting the HC needs to read
* qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and
* expect khubd to clean up after any CSPLITs we won't issue.
* active high speed queues may need bigger delays...
*/
if (list_empty(&qh->qtd_list)
|| (__constant_cpu_to_le32(QH_CMASK) & qh->hw_info2) != 0)
wait = 2;
else
wait = 55; /* worst case: 3 * 1024 */
udelay(wait);
qh->qh_state = QH_STATE_IDLE;
qh->hw_next = EHCI_LIST_END;
wmb();
}
static int check_period(struct oxu_hcd *oxu,
unsigned frame, unsigned uframe,
unsigned period, unsigned usecs)
{
int claimed;
/* complete split running into next frame?
* given FSTN support, we could sometimes check...
*/
if (uframe >= 8)
return 0;
/*
* 80% periodic == 100 usec/uframe available
* convert "usecs we need" to "max already claimed"
*/
usecs = 100 - usecs;
/* we "know" 2 and 4 uframe intervals were rejected; so
* for period 0, check _every_ microframe in the schedule.
*/
if (unlikely(period == 0)) {
do {
for (uframe = 0; uframe < 7; uframe++) {
claimed = periodic_usecs(oxu, frame, uframe);
if (claimed > usecs)
return 0;
}
} while ((frame += 1) < oxu->periodic_size);
/* just check the specified uframe, at that period */
} else {
do {
claimed = periodic_usecs(oxu, frame, uframe);
if (claimed > usecs)
return 0;
} while ((frame += period) < oxu->periodic_size);
}
return 1;
}
static int check_intr_schedule(struct oxu_hcd *oxu,
unsigned frame, unsigned uframe,
const struct ehci_qh *qh, __le32 *c_maskp)
{
int retval = -ENOSPC;
if (qh->c_usecs && uframe >= 6) /* FSTN territory? */
goto done;
if (!check_period(oxu, frame, uframe, qh->period, qh->usecs))
goto done;
if (!qh->c_usecs) {
retval = 0;
*c_maskp = 0;
goto done;
}
done:
return retval;
}
/* "first fit" scheduling policy used the first time through,
* or when the previous schedule slot can't be re-used.
*/
static int qh_schedule(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
int status;
unsigned uframe;
__le32 c_mask;
unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */
qh_refresh(oxu, qh);
qh->hw_next = EHCI_LIST_END;
frame = qh->start;
/* reuse the previous schedule slots, if we can */
if (frame < qh->period) {
uframe = ffs(le32_to_cpup(&qh->hw_info2) & QH_SMASK);
status = check_intr_schedule(oxu, frame, --uframe,
qh, &c_mask);
} else {
uframe = 0;
c_mask = 0;
status = -ENOSPC;
}
/* else scan the schedule to find a group of slots such that all
* uframes have enough periodic bandwidth available.
*/
if (status) {
/* "normal" case, uframing flexible except with splits */
if (qh->period) {
frame = qh->period - 1;
do {
for (uframe = 0; uframe < 8; uframe++) {
status = check_intr_schedule(oxu,
frame, uframe, qh,
&c_mask);
if (status == 0)
break;
}
} while (status && frame--);
/* qh->period == 0 means every uframe */
} else {
frame = 0;
status = check_intr_schedule(oxu, 0, 0, qh, &c_mask);
}
if (status)
goto done;
qh->start = frame;
/* reset S-frame and (maybe) C-frame masks */
qh->hw_info2 &= __constant_cpu_to_le32(~(QH_CMASK | QH_SMASK));
qh->hw_info2 |= qh->period
? cpu_to_le32(1 << uframe)
: __constant_cpu_to_le32(QH_SMASK);
qh->hw_info2 |= c_mask;
} else
oxu_dbg(oxu, "reused qh %p schedule\n", qh);
/* stuff into the periodic schedule */
status = qh_link_periodic(oxu, qh);
done:
return status;
}
static int intr_submit(struct oxu_hcd *oxu, struct urb *urb,
struct list_head *qtd_list, gfp_t mem_flags)
{
unsigned epnum;
unsigned long flags;
struct ehci_qh *qh;
int status = 0;
struct list_head empty;
/* get endpoint and transfer/schedule data */
epnum = urb->ep->desc.bEndpointAddress;
spin_lock_irqsave(&oxu->lock, flags);
if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
&oxu_to_hcd(oxu)->flags))) {
status = -ESHUTDOWN;
goto done;
}
/* get qh and force any scheduling errors */
INIT_LIST_HEAD(&empty);
qh = qh_append_tds(oxu, urb, &empty, epnum, &urb->ep->hcpriv);
if (qh == NULL) {
status = -ENOMEM;
goto done;
}
if (qh->qh_state == QH_STATE_IDLE) {
status = qh_schedule(oxu, qh);
if (status != 0)
goto done;
}
/* then queue the urb's tds to the qh */
qh = qh_append_tds(oxu, urb, qtd_list, epnum, &urb->ep->hcpriv);
BUG_ON(qh == NULL);
/* ... update usbfs periodic stats */
oxu_to_hcd(oxu)->self.bandwidth_int_reqs++;
done:
spin_unlock_irqrestore(&oxu->lock, flags);
if (status)
qtd_list_free(oxu, urb, qtd_list);
return status;
}
static inline int itd_submit(struct oxu_hcd *oxu, struct urb *urb,
gfp_t mem_flags)
{
oxu_dbg(oxu, "iso support is missing!\n");
return -ENOSYS;
}
static inline int sitd_submit(struct oxu_hcd *oxu, struct urb *urb,
gfp_t mem_flags)
{
oxu_dbg(oxu, "split iso support is missing!\n");
return -ENOSYS;
}
static void scan_periodic(struct oxu_hcd *oxu)
{
unsigned frame, clock, now_uframe, mod;
unsigned modified;
mod = oxu->periodic_size << 3;
/*
* When running, scan from last scan point up to "now"
* else clean up by scanning everything that's left.
* Touches as few pages as possible: cache-friendly.
*/
now_uframe = oxu->next_uframe;
if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
clock = readl(&oxu->regs->frame_index);
else
clock = now_uframe + mod - 1;
clock %= mod;
for (;;) {
union ehci_shadow q, *q_p;
__le32 type, *hw_p;
unsigned uframes;
/* don't scan past the live uframe */
frame = now_uframe >> 3;
if (frame == (clock >> 3))
uframes = now_uframe & 0x07;
else {
/* safe to scan the whole frame at once */
now_uframe |= 0x07;
uframes = 8;
}
restart:
/* scan each element in frame's queue for completions */
q_p = &oxu->pshadow[frame];
hw_p = &oxu->periodic[frame];
q.ptr = q_p->ptr;
type = Q_NEXT_TYPE(*hw_p);
modified = 0;
while (q.ptr != NULL) {
union ehci_shadow temp;
int live;
live = HC_IS_RUNNING(oxu_to_hcd(oxu)->state);
switch (type) {
case Q_TYPE_QH:
/* handle any completions */
temp.qh = qh_get(q.qh);
type = Q_NEXT_TYPE(q.qh->hw_next);
q = q.qh->qh_next;
modified = qh_completions(oxu, temp.qh);
if (unlikely(list_empty(&temp.qh->qtd_list)))
intr_deschedule(oxu, temp.qh);
qh_put(temp.qh);
break;
default:
dbg("corrupt type %d frame %d shadow %p",
type, frame, q.ptr);
q.ptr = NULL;
}
/* assume completion callbacks modify the queue */
if (unlikely(modified))
goto restart;
}
/* Stop when we catch up to the HC */
/* FIXME: this assumes we won't get lapped when
* latencies climb; that should be rare, but...
* detect it, and just go all the way around.
* FLR might help detect this case, so long as latencies
* don't exceed periodic_size msec (default 1.024 sec).
*/
/* FIXME: likewise assumes HC doesn't halt mid-scan */
if (now_uframe == clock) {
unsigned now;
if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
break;
oxu->next_uframe = now_uframe;
now = readl(&oxu->regs->frame_index) % mod;
if (now_uframe == now)
break;
/* rescan the rest of this frame, then ... */
clock = now;
} else {
now_uframe++;
now_uframe %= mod;
}
}
}
/* On some systems, leaving remote wakeup enabled prevents system shutdown.
* The firmware seems to think that powering off is a wakeup event!
* This routine turns off remote wakeup and everything else, on all ports.
*/
static void ehci_turn_off_all_ports(struct oxu_hcd *oxu)
{
int port = HCS_N_PORTS(oxu->hcs_params);
while (port--)
writel(PORT_RWC_BITS, &oxu->regs->port_status[port]);
}
static void ehci_port_power(struct oxu_hcd *oxu, int is_on)
{
unsigned port;
if (!HCS_PPC(oxu->hcs_params))
return;
oxu_dbg(oxu, "...power%s ports...\n", is_on ? "up" : "down");
for (port = HCS_N_PORTS(oxu->hcs_params); port > 0; )
(void) oxu_hub_control(oxu_to_hcd(oxu),
is_on ? SetPortFeature : ClearPortFeature,
USB_PORT_FEAT_POWER,
port--, NULL, 0);
msleep(20);
}
/* Called from some interrupts, timers, and so on.
* It calls driver completion functions, after dropping oxu->lock.
*/
static void ehci_work(struct oxu_hcd *oxu)
{
timer_action_done(oxu, TIMER_IO_WATCHDOG);
if (oxu->reclaim_ready)
end_unlink_async(oxu);
/* another CPU may drop oxu->lock during a schedule scan while
* it reports urb completions. this flag guards against bogus
* attempts at re-entrant schedule scanning.
*/
if (oxu->scanning)
return;
oxu->scanning = 1;
scan_async(oxu);
if (oxu->next_uframe != -1)
scan_periodic(oxu);
oxu->scanning = 0;
/* the IO watchdog guards against hardware or driver bugs that
* misplace IRQs, and should let us run completely without IRQs.
* such lossage has been observed on both VT6202 and VT8235.
*/
if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state) &&
(oxu->async->qh_next.ptr != NULL ||
oxu->periodic_sched != 0))
timer_action(oxu, TIMER_IO_WATCHDOG);
}
static void unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
{
/* if we need to use IAA and it's busy, defer */
if (qh->qh_state == QH_STATE_LINKED
&& oxu->reclaim
&& HC_IS_RUNNING(oxu_to_hcd(oxu)->state)) {
struct ehci_qh *last;
for (last = oxu->reclaim;
last->reclaim;
last = last->reclaim)
continue;
qh->qh_state = QH_STATE_UNLINK_WAIT;
last->reclaim = qh;
/* bypass IAA if the hc can't care */
} else if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state) && oxu->reclaim)
end_unlink_async(oxu);
/* something else might have unlinked the qh by now */
if (qh->qh_state == QH_STATE_LINKED)
start_unlink_async(oxu, qh);
}
/*
* USB host controller methods
*/
static irqreturn_t oxu210_hcd_irq(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
u32 status, pcd_status = 0;
int bh;
spin_lock(&oxu->lock);
status = readl(&oxu->regs->status);
/* e.g. cardbus physical eject */
if (status == ~(u32) 0) {
oxu_dbg(oxu, "device removed\n");
goto dead;
}
status &= INTR_MASK;
if (!status) { /* irq sharing? */
spin_unlock(&oxu->lock);
return IRQ_NONE;
}
/* clear (just) interrupts */
writel(status, &oxu->regs->status);
readl(&oxu->regs->command); /* unblock posted write */
bh = 0;
#ifdef OXU_VERBOSE_DEBUG
/* unrequested/ignored: Frame List Rollover */
dbg_status(oxu, "irq", status);
#endif
/* INT, ERR, and IAA interrupt rates can be throttled */
/* normal [4.15.1.2] or error [4.15.1.1] completion */
if (likely((status & (STS_INT|STS_ERR)) != 0))
bh = 1;
/* complete the unlinking of some qh [4.15.2.3] */
if (status & STS_IAA) {
oxu->reclaim_ready = 1;
bh = 1;
}
/* remote wakeup [4.3.1] */
if (status & STS_PCD) {
unsigned i = HCS_N_PORTS(oxu->hcs_params);
pcd_status = status;
/* resume root hub? */
if (!(readl(&oxu->regs->command) & CMD_RUN))
usb_hcd_resume_root_hub(hcd);
while (i--) {
int pstatus = readl(&oxu->regs->port_status[i]);
if (pstatus & PORT_OWNER)
continue;
if (!(pstatus & PORT_RESUME)
|| oxu->reset_done[i] != 0)
continue;
/* start 20 msec resume signaling from this port,
* and make khubd collect PORT_STAT_C_SUSPEND to
* stop that signaling.
*/
oxu->reset_done[i] = jiffies + msecs_to_jiffies(20);
oxu_dbg(oxu, "port %d remote wakeup\n", i + 1);
mod_timer(&hcd->rh_timer, oxu->reset_done[i]);
}
}
/* PCI errors [4.15.2.4] */
if (unlikely((status & STS_FATAL) != 0)) {
/* bogus "fatal" IRQs appear on some chips... why? */
status = readl(&oxu->regs->status);
dbg_cmd(oxu, "fatal", readl(&oxu->regs->command));
dbg_status(oxu, "fatal", status);
if (status & STS_HALT) {
oxu_err(oxu, "fatal error\n");
dead:
ehci_reset(oxu);
writel(0, &oxu->regs->configured_flag);
/* generic layer kills/unlinks all urbs, then
* uses oxu_stop to clean up the rest
*/
bh = 1;
}
}
if (bh)
ehci_work(oxu);
spin_unlock(&oxu->lock);
if (pcd_status & STS_PCD)
usb_hcd_poll_rh_status(hcd);
return IRQ_HANDLED;
}
static irqreturn_t oxu_irq(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
int ret = IRQ_HANDLED;
u32 status = oxu_readl(hcd->regs, OXU_CHIPIRQSTATUS);
u32 enable = oxu_readl(hcd->regs, OXU_CHIPIRQEN_SET);
/* Disable all interrupt */
oxu_writel(hcd->regs, OXU_CHIPIRQEN_CLR, enable);
if ((oxu->is_otg && (status & OXU_USBOTGI)) ||
(!oxu->is_otg && (status & OXU_USBSPHI)))
oxu210_hcd_irq(hcd);
else
ret = IRQ_NONE;
/* Enable all interrupt back */
oxu_writel(hcd->regs, OXU_CHIPIRQEN_SET, enable);
return ret;
}
static void oxu_watchdog(unsigned long param)
{
struct oxu_hcd *oxu = (struct oxu_hcd *) param;
unsigned long flags;
spin_lock_irqsave(&oxu->lock, flags);
/* lost IAA irqs wedge things badly; seen with a vt8235 */
if (oxu->reclaim) {
u32 status = readl(&oxu->regs->status);
if (status & STS_IAA) {
oxu_vdbg(oxu, "lost IAA\n");
writel(STS_IAA, &oxu->regs->status);
oxu->reclaim_ready = 1;
}
}
/* stop async processing after it's idled a bit */
if (test_bit(TIMER_ASYNC_OFF, &oxu->actions))
start_unlink_async(oxu, oxu->async);
/* oxu could run by timer, without IRQs ... */
ehci_work(oxu);
spin_unlock_irqrestore(&oxu->lock, flags);
}
/* One-time init, only for memory state.
*/
static int oxu_hcd_init(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
u32 temp;
int retval;
u32 hcc_params;
spin_lock_init(&oxu->lock);
init_timer(&oxu->watchdog);
oxu->watchdog.function = oxu_watchdog;
oxu->watchdog.data = (unsigned long) oxu;
/*
* hw default: 1K periodic list heads, one per frame.
* periodic_size can shrink by USBCMD update if hcc_params allows.
*/
oxu->periodic_size = DEFAULT_I_TDPS;
retval = ehci_mem_init(oxu, GFP_KERNEL);
if (retval < 0)
return retval;
/* controllers may cache some of the periodic schedule ... */
hcc_params = readl(&oxu->caps->hcc_params);
if (HCC_ISOC_CACHE(hcc_params)) /* full frame cache */
oxu->i_thresh = 8;
else /* N microframes cached */
oxu->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
oxu->reclaim = NULL;
oxu->reclaim_ready = 0;
oxu->next_uframe = -1;
/*
* dedicate a qh for the async ring head, since we couldn't unlink
* a 'real' qh without stopping the async schedule [4.8]. use it
* as the 'reclamation list head' too.
* its dummy is used in hw_alt_next of many tds, to prevent the qh
* from automatically advancing to the next td after short reads.
*/
oxu->async->qh_next.qh = NULL;
oxu->async->hw_next = QH_NEXT(oxu->async->qh_dma);
oxu->async->hw_info1 = cpu_to_le32(QH_HEAD);
oxu->async->hw_token = cpu_to_le32(QTD_STS_HALT);
oxu->async->hw_qtd_next = EHCI_LIST_END;
oxu->async->qh_state = QH_STATE_LINKED;
oxu->async->hw_alt_next = QTD_NEXT(oxu->async->dummy->qtd_dma);
/* clear interrupt enables, set irq latency */
if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
log2_irq_thresh = 0;
temp = 1 << (16 + log2_irq_thresh);
if (HCC_CANPARK(hcc_params)) {
/* HW default park == 3, on hardware that supports it (like
* NVidia and ALI silicon), maximizes throughput on the async
* schedule by avoiding QH fetches between transfers.
*
* With fast usb storage devices and NForce2, "park" seems to
* make problems: throughput reduction (!), data errors...
*/
if (park) {
park = min(park, (unsigned) 3);
temp |= CMD_PARK;
temp |= park << 8;
}
oxu_dbg(oxu, "park %d\n", park);
}
if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
/* periodic schedule size can be smaller than default */
temp &= ~(3 << 2);
temp |= (EHCI_TUNE_FLS << 2);
}
oxu->command = temp;
return 0;
}
/* Called during probe() after chip reset completes.
*/
static int oxu_reset(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
int ret;
spin_lock_init(&oxu->mem_lock);
INIT_LIST_HEAD(&oxu->urb_list);
oxu->urb_len = 0;
/* FIMXE */
hcd->self.controller->dma_mask = 0UL;
if (oxu->is_otg) {
oxu->caps = hcd->regs + OXU_OTG_CAP_OFFSET;
oxu->regs = hcd->regs + OXU_OTG_CAP_OFFSET + \
HC_LENGTH(readl(&oxu->caps->hc_capbase));
oxu->mem = hcd->regs + OXU_SPH_MEM;
} else {
oxu->caps = hcd->regs + OXU_SPH_CAP_OFFSET;
oxu->regs = hcd->regs + OXU_SPH_CAP_OFFSET + \
HC_LENGTH(readl(&oxu->caps->hc_capbase));
oxu->mem = hcd->regs + OXU_OTG_MEM;
}
oxu->hcs_params = readl(&oxu->caps->hcs_params);
oxu->sbrn = 0x20;
ret = oxu_hcd_init(hcd);
if (ret)
return ret;
return 0;
}
static int oxu_run(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
int retval;
u32 temp, hcc_params;
hcd->uses_new_polling = 1;
hcd->poll_rh = 0;
/* EHCI spec section 4.1 */
retval = ehci_reset(oxu);
if (retval != 0) {
ehci_mem_cleanup(oxu);
return retval;
}
writel(oxu->periodic_dma, &oxu->regs->frame_list);
writel((u32) oxu->async->qh_dma, &oxu->regs->async_next);
/* hcc_params controls whether oxu->regs->segment must (!!!)
* be used; it constrains QH/ITD/SITD and QTD locations.
* pci_pool consistent memory always uses segment zero.
* streaming mappings for I/O buffers, like pci_map_single(),
* can return segments above 4GB, if the device allows.
*
* NOTE: the dma mask is visible through dma_supported(), so
* drivers can pass this info along ... like NETIF_F_HIGHDMA,
* Scsi_Host.highmem_io, and so forth. It's readonly to all
* host side drivers though.
*/
hcc_params = readl(&oxu->caps->hcc_params);
if (HCC_64BIT_ADDR(hcc_params))
writel(0, &oxu->regs->segment);
oxu->command &= ~(CMD_LRESET | CMD_IAAD | CMD_PSE |
CMD_ASE | CMD_RESET);
oxu->command |= CMD_RUN;
writel(oxu->command, &oxu->regs->command);
dbg_cmd(oxu, "init", oxu->command);
/*
* Start, enabling full USB 2.0 functionality ... usb 1.1 devices
* are explicitly handed to companion controller(s), so no TT is
* involved with the root hub. (Except where one is integrated,
* and there's no companion controller unless maybe for USB OTG.)
*/
hcd->state = HC_STATE_RUNNING;
writel(FLAG_CF, &oxu->regs->configured_flag);
readl(&oxu->regs->command); /* unblock posted writes */
temp = HC_VERSION(readl(&oxu->caps->hc_capbase));
oxu_info(oxu, "USB %x.%x started, quasi-EHCI %x.%02x, driver %s%s\n",
((oxu->sbrn & 0xf0)>>4), (oxu->sbrn & 0x0f),
temp >> 8, temp & 0xff, DRIVER_VERSION,
ignore_oc ? ", overcurrent ignored" : "");
writel(INTR_MASK, &oxu->regs->intr_enable); /* Turn On Interrupts */
return 0;
}
static void oxu_stop(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
/* Turn off port power on all root hub ports. */
ehci_port_power(oxu, 0);
/* no more interrupts ... */
del_timer_sync(&oxu->watchdog);
spin_lock_irq(&oxu->lock);
if (HC_IS_RUNNING(hcd->state))
ehci_quiesce(oxu);
ehci_reset(oxu);
writel(0, &oxu->regs->intr_enable);
spin_unlock_irq(&oxu->lock);
/* let companion controllers work when we aren't */
writel(0, &oxu->regs->configured_flag);
/* root hub is shut down separately (first, when possible) */
spin_lock_irq(&oxu->lock);
if (oxu->async)
ehci_work(oxu);
spin_unlock_irq(&oxu->lock);
ehci_mem_cleanup(oxu);
dbg_status(oxu, "oxu_stop completed", readl(&oxu->regs->status));
}
/* Kick in for silicon on any bus (not just pci, etc).
* This forcibly disables dma and IRQs, helping kexec and other cases
* where the next system software may expect clean state.
*/
static void oxu_shutdown(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
(void) ehci_halt(oxu);
ehci_turn_off_all_ports(oxu);
/* make BIOS/etc use companion controller during reboot */
writel(0, &oxu->regs->configured_flag);
/* unblock posted writes */
readl(&oxu->regs->configured_flag);
}
/* Non-error returns are a promise to giveback() the urb later
* we drop ownership so next owner (or urb unlink) can get it
*
* urb + dev is in hcd.self.controller.urb_list
* we're queueing TDs onto software and hardware lists
*
* hcd-specific init for hcpriv hasn't been done yet
*
* NOTE: control, bulk, and interrupt share the same code to append TDs
* to a (possibly active) QH, and the same QH scanning code.
*/
static int __oxu_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
gfp_t mem_flags)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
struct list_head qtd_list;
INIT_LIST_HEAD(&qtd_list);
switch (usb_pipetype(urb->pipe)) {
case PIPE_CONTROL:
case PIPE_BULK:
default:
if (!qh_urb_transaction(oxu, urb, &qtd_list, mem_flags))
return -ENOMEM;
return submit_async(oxu, urb, &qtd_list, mem_flags);
case PIPE_INTERRUPT:
if (!qh_urb_transaction(oxu, urb, &qtd_list, mem_flags))
return -ENOMEM;
return intr_submit(oxu, urb, &qtd_list, mem_flags);
case PIPE_ISOCHRONOUS:
if (urb->dev->speed == USB_SPEED_HIGH)
return itd_submit(oxu, urb, mem_flags);
else
return sitd_submit(oxu, urb, mem_flags);
}
}
/* This function is responsible for breaking URBs with big data size
* into smaller size and processing small urbs in sequence.
*/
static int oxu_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
gfp_t mem_flags)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
int num, rem;
int transfer_buffer_length;
void *transfer_buffer;
struct urb *murb;
int i, ret;
/* If not bulk pipe just enqueue the URB */
if (!usb_pipebulk(urb->pipe))
return __oxu_urb_enqueue(hcd, urb, mem_flags);
/* Otherwise we should verify the USB transfer buffer size! */
transfer_buffer = urb->transfer_buffer;
transfer_buffer_length = urb->transfer_buffer_length;
num = urb->transfer_buffer_length / 4096;
rem = urb->transfer_buffer_length % 4096;
if (rem != 0)
num++;
/* If URB is smaller than 4096 bytes just enqueue it! */
if (num == 1)
return __oxu_urb_enqueue(hcd, urb, mem_flags);
/* Ok, we have more job to do! :) */
for (i = 0; i < num - 1; i++) {
/* Get free micro URB poll till a free urb is recieved */
do {
murb = (struct urb *) oxu_murb_alloc(oxu);
if (!murb)
schedule();
} while (!murb);
/* Coping the urb */
memcpy(murb, urb, sizeof(struct urb));
murb->transfer_buffer_length = 4096;
murb->transfer_buffer = transfer_buffer + i * 4096;
/* Null pointer for the encodes that this is a micro urb */
murb->complete = NULL;
((struct oxu_murb *) murb)->main = urb;
((struct oxu_murb *) murb)->last = 0;
/* This loop is to guarantee urb to be processed when there's
* not enough resources at a particular time by retrying.
*/
do {
ret = __oxu_urb_enqueue(hcd, murb, mem_flags);
if (ret)
schedule();
} while (ret);
}
/* Last urb requires special handling */
/* Get free micro URB poll till a free urb is recieved */
do {
murb = (struct urb *) oxu_murb_alloc(oxu);
if (!murb)
schedule();
} while (!murb);
/* Coping the urb */
memcpy(murb, urb, sizeof(struct urb));
murb->transfer_buffer_length = rem > 0 ? rem : 4096;
murb->transfer_buffer = transfer_buffer + (num - 1) * 4096;
/* Null pointer for the encodes that this is a micro urb */
murb->complete = NULL;
((struct oxu_murb *) murb)->main = urb;
((struct oxu_murb *) murb)->last = 1;
do {
ret = __oxu_urb_enqueue(hcd, murb, mem_flags);
if (ret)
schedule();
} while (ret);
return ret;
}
/* Remove from hardware lists.
* Completions normally happen asynchronously
*/
static int oxu_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
struct ehci_qh *qh;
unsigned long flags;
spin_lock_irqsave(&oxu->lock, flags);
switch (usb_pipetype(urb->pipe)) {
case PIPE_CONTROL:
case PIPE_BULK:
default:
qh = (struct ehci_qh *) urb->hcpriv;
if (!qh)
break;
unlink_async(oxu, qh);
break;
case PIPE_INTERRUPT:
qh = (struct ehci_qh *) urb->hcpriv;
if (!qh)
break;
switch (qh->qh_state) {
case QH_STATE_LINKED:
intr_deschedule(oxu, qh);
/* FALL THROUGH */
case QH_STATE_IDLE:
qh_completions(oxu, qh);
break;
default:
oxu_dbg(oxu, "bogus qh %p state %d\n",
qh, qh->qh_state);
goto done;
}
/* reschedule QH iff another request is queued */
if (!list_empty(&qh->qtd_list)
&& HC_IS_RUNNING(hcd->state)) {
int status;
status = qh_schedule(oxu, qh);
spin_unlock_irqrestore(&oxu->lock, flags);
if (status != 0) {
/* shouldn't happen often, but ...
* FIXME kill those tds' urbs
*/
err("can't reschedule qh %p, err %d",
qh, status);
}
return status;
}
break;
}
done:
spin_unlock_irqrestore(&oxu->lock, flags);
return 0;
}
/* Bulk qh holds the data toggle */
static void oxu_endpoint_disable(struct usb_hcd *hcd,
struct usb_host_endpoint *ep)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
unsigned long flags;
struct ehci_qh *qh, *tmp;
/* ASSERT: any requests/urbs are being unlinked */
/* ASSERT: nobody can be submitting urbs for this any more */
rescan:
spin_lock_irqsave(&oxu->lock, flags);
qh = ep->hcpriv;
if (!qh)
goto done;
/* endpoints can be iso streams. for now, we don't
* accelerate iso completions ... so spin a while.
*/
if (qh->hw_info1 == 0) {
oxu_vdbg(oxu, "iso delay\n");
goto idle_timeout;
}
if (!HC_IS_RUNNING(hcd->state))
qh->qh_state = QH_STATE_IDLE;
switch (qh->qh_state) {
case QH_STATE_LINKED:
for (tmp = oxu->async->qh_next.qh;
tmp && tmp != qh;
tmp = tmp->qh_next.qh)
continue;
/* periodic qh self-unlinks on empty */
if (!tmp)
goto nogood;
unlink_async(oxu, qh);
/* FALL THROUGH */
case QH_STATE_UNLINK: /* wait for hw to finish? */
idle_timeout:
spin_unlock_irqrestore(&oxu->lock, flags);
schedule_timeout_uninterruptible(1);
goto rescan;
case QH_STATE_IDLE: /* fully unlinked */
if (list_empty(&qh->qtd_list)) {
qh_put(qh);
break;
}
/* else FALL THROUGH */
default:
nogood:
/* caller was supposed to have unlinked any requests;
* that's not our job. just leak this memory.
*/
oxu_err(oxu, "qh %p (#%02x) state %d%s\n",
qh, ep->desc.bEndpointAddress, qh->qh_state,
list_empty(&qh->qtd_list) ? "" : "(has tds)");
break;
}
ep->hcpriv = NULL;
done:
spin_unlock_irqrestore(&oxu->lock, flags);
return;
}
static int oxu_get_frame(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
return (readl(&oxu->regs->frame_index) >> 3) %
oxu->periodic_size;
}
/* Build "status change" packet (one or two bytes) from HC registers */
static int oxu_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
u32 temp, mask, status = 0;
int ports, i, retval = 1;
unsigned long flags;
/* if !USB_SUSPEND, root hub timers won't get shut down ... */
if (!HC_IS_RUNNING(hcd->state))
return 0;
/* init status to no-changes */
buf[0] = 0;
ports = HCS_N_PORTS(oxu->hcs_params);
if (ports > 7) {
buf[1] = 0;
retval++;
}
/* Some boards (mostly VIA?) report bogus overcurrent indications,
* causing massive log spam unless we completely ignore them. It
* may be relevant that VIA VT8235 controlers, where PORT_POWER is
* always set, seem to clear PORT_OCC and PORT_CSC when writing to
* PORT_POWER; that's surprising, but maybe within-spec.
*/
if (!ignore_oc)
mask = PORT_CSC | PORT_PEC | PORT_OCC;
else
mask = PORT_CSC | PORT_PEC;
/* no hub change reports (bit 0) for now (power, ...) */
/* port N changes (bit N)? */
spin_lock_irqsave(&oxu->lock, flags);
for (i = 0; i < ports; i++) {
temp = readl(&oxu->regs->port_status[i]);
/*
* Return status information even for ports with OWNER set.
* Otherwise khubd wouldn't see the disconnect event when a
* high-speed device is switched over to the companion
* controller by the user.
*/
if (!(temp & PORT_CONNECT))
oxu->reset_done[i] = 0;
if ((temp & mask) != 0 || ((temp & PORT_RESUME) != 0 &&
time_after_eq(jiffies, oxu->reset_done[i]))) {
if (i < 7)
buf[0] |= 1 << (i + 1);
else
buf[1] |= 1 << (i - 7);
status = STS_PCD;
}
}
/* FIXME autosuspend idle root hubs */
spin_unlock_irqrestore(&oxu->lock, flags);
return status ? retval : 0;
}
/* Returns the speed of a device attached to a port on the root hub. */
static inline unsigned int oxu_port_speed(struct oxu_hcd *oxu,
unsigned int portsc)
{
switch ((portsc >> 26) & 3) {
case 0:
return 0;
case 1:
return 1 << USB_PORT_FEAT_LOWSPEED;
case 2:
default:
return 1 << USB_PORT_FEAT_HIGHSPEED;
}
}
#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
static int oxu_hub_control(struct usb_hcd *hcd, u16 typeReq,
u16 wValue, u16 wIndex, char *buf, u16 wLength)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
int ports = HCS_N_PORTS(oxu->hcs_params);
u32 __iomem *status_reg = &oxu->regs->port_status[wIndex - 1];
u32 temp, status;
unsigned long flags;
int retval = 0;
unsigned selector;
/*
* FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
* HCS_INDICATOR may say we can change LEDs to off/amber/green.
* (track current state ourselves) ... blink for diagnostics,
* power, "this is the one", etc. EHCI spec supports this.
*/
spin_lock_irqsave(&oxu->lock, flags);
switch (typeReq) {
case ClearHubFeature:
switch (wValue) {
case C_HUB_LOCAL_POWER:
case C_HUB_OVER_CURRENT:
/* no hub-wide feature/status flags */
break;
default:
goto error;
}
break;
case ClearPortFeature:
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
temp = readl(status_reg);
/*
* Even if OWNER is set, so the port is owned by the
* companion controller, khubd needs to be able to clear
* the port-change status bits (especially
* USB_PORT_FEAT_C_CONNECTION).
*/
switch (wValue) {
case USB_PORT_FEAT_ENABLE:
writel(temp & ~PORT_PE, status_reg);
break;
case USB_PORT_FEAT_C_ENABLE:
writel((temp & ~PORT_RWC_BITS) | PORT_PEC, status_reg);
break;
case USB_PORT_FEAT_SUSPEND:
if (temp & PORT_RESET)
goto error;
if (temp & PORT_SUSPEND) {
if ((temp & PORT_PE) == 0)
goto error;
/* resume signaling for 20 msec */
temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
writel(temp | PORT_RESUME, status_reg);
oxu->reset_done[wIndex] = jiffies
+ msecs_to_jiffies(20);
}
break;
case USB_PORT_FEAT_C_SUSPEND:
/* we auto-clear this feature */
break;
case USB_PORT_FEAT_POWER:
if (HCS_PPC(oxu->hcs_params))
writel(temp & ~(PORT_RWC_BITS | PORT_POWER),
status_reg);
break;
case USB_PORT_FEAT_C_CONNECTION:
writel((temp & ~PORT_RWC_BITS) | PORT_CSC, status_reg);
break;
case USB_PORT_FEAT_C_OVER_CURRENT:
writel((temp & ~PORT_RWC_BITS) | PORT_OCC, status_reg);
break;
case USB_PORT_FEAT_C_RESET:
/* GetPortStatus clears reset */
break;
default:
goto error;
}
readl(&oxu->regs->command); /* unblock posted write */
break;
case GetHubDescriptor:
ehci_hub_descriptor(oxu, (struct usb_hub_descriptor *)
buf);
break;
case GetHubStatus:
/* no hub-wide feature/status flags */
memset(buf, 0, 4);
break;
case GetPortStatus:
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
status = 0;
temp = readl(status_reg);
/* wPortChange bits */
if (temp & PORT_CSC)
status |= 1 << USB_PORT_FEAT_C_CONNECTION;
if (temp & PORT_PEC)
status |= 1 << USB_PORT_FEAT_C_ENABLE;
if ((temp & PORT_OCC) && !ignore_oc)
status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
/* whoever resumes must GetPortStatus to complete it!! */
if (temp & PORT_RESUME) {
/* Remote Wakeup received? */
if (!oxu->reset_done[wIndex]) {
/* resume signaling for 20 msec */
oxu->reset_done[wIndex] = jiffies
+ msecs_to_jiffies(20);
/* check the port again */
mod_timer(&oxu_to_hcd(oxu)->rh_timer,
oxu->reset_done[wIndex]);
}
/* resume completed? */
else if (time_after_eq(jiffies,
oxu->reset_done[wIndex])) {
status |= 1 << USB_PORT_FEAT_C_SUSPEND;
oxu->reset_done[wIndex] = 0;
/* stop resume signaling */
temp = readl(status_reg);
writel(temp & ~(PORT_RWC_BITS | PORT_RESUME),
status_reg);
retval = handshake(oxu, status_reg,
PORT_RESUME, 0, 2000 /* 2msec */);
if (retval != 0) {
oxu_err(oxu,
"port %d resume error %d\n",
wIndex + 1, retval);
goto error;
}
temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
}
}
/* whoever resets must GetPortStatus to complete it!! */
if ((temp & PORT_RESET)
&& time_after_eq(jiffies,
oxu->reset_done[wIndex])) {
status |= 1 << USB_PORT_FEAT_C_RESET;
oxu->reset_done[wIndex] = 0;
/* force reset to complete */
writel(temp & ~(PORT_RWC_BITS | PORT_RESET),
status_reg);
/* REVISIT: some hardware needs 550+ usec to clear
* this bit; seems too long to spin routinely...
*/
retval = handshake(oxu, status_reg,
PORT_RESET, 0, 750);
if (retval != 0) {
oxu_err(oxu, "port %d reset error %d\n",
wIndex + 1, retval);
goto error;
}
/* see what we found out */
temp = check_reset_complete(oxu, wIndex, status_reg,
readl(status_reg));
}
/* transfer dedicated ports to the companion hc */
if ((temp & PORT_CONNECT) &&
test_bit(wIndex, &oxu->companion_ports)) {
temp &= ~PORT_RWC_BITS;
temp |= PORT_OWNER;
writel(temp, status_reg);
oxu_dbg(oxu, "port %d --> companion\n", wIndex + 1);
temp = readl(status_reg);
}
/*
* Even if OWNER is set, there's no harm letting khubd
* see the wPortStatus values (they should all be 0 except
* for PORT_POWER anyway).
*/
if (temp & PORT_CONNECT) {
status |= 1 << USB_PORT_FEAT_CONNECTION;
/* status may be from integrated TT */
status |= oxu_port_speed(oxu, temp);
}
if (temp & PORT_PE)
status |= 1 << USB_PORT_FEAT_ENABLE;
if (temp & (PORT_SUSPEND|PORT_RESUME))
status |= 1 << USB_PORT_FEAT_SUSPEND;
if (temp & PORT_OC)
status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
if (temp & PORT_RESET)
status |= 1 << USB_PORT_FEAT_RESET;
if (temp & PORT_POWER)
status |= 1 << USB_PORT_FEAT_POWER;
#ifndef OXU_VERBOSE_DEBUG
if (status & ~0xffff) /* only if wPortChange is interesting */
#endif
dbg_port(oxu, "GetStatus", wIndex + 1, temp);
put_unaligned(cpu_to_le32(status), (__le32 *) buf);
break;
case SetHubFeature:
switch (wValue) {
case C_HUB_LOCAL_POWER:
case C_HUB_OVER_CURRENT:
/* no hub-wide feature/status flags */
break;
default:
goto error;
}
break;
case SetPortFeature:
selector = wIndex >> 8;
wIndex &= 0xff;
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
temp = readl(status_reg);
if (temp & PORT_OWNER)
break;
temp &= ~PORT_RWC_BITS;
switch (wValue) {
case USB_PORT_FEAT_SUSPEND:
if ((temp & PORT_PE) == 0
|| (temp & PORT_RESET) != 0)
goto error;
if (device_may_wakeup(&hcd->self.root_hub->dev))
temp |= PORT_WAKE_BITS;
writel(temp | PORT_SUSPEND, status_reg);
break;
case USB_PORT_FEAT_POWER:
if (HCS_PPC(oxu->hcs_params))
writel(temp | PORT_POWER, status_reg);
break;
case USB_PORT_FEAT_RESET:
if (temp & PORT_RESUME)
goto error;
/* line status bits may report this as low speed,
* which can be fine if this root hub has a
* transaction translator built in.
*/
oxu_vdbg(oxu, "port %d reset\n", wIndex + 1);
temp |= PORT_RESET;
temp &= ~PORT_PE;
/*
* caller must wait, then call GetPortStatus
* usb 2.0 spec says 50 ms resets on root
*/
oxu->reset_done[wIndex] = jiffies
+ msecs_to_jiffies(50);
writel(temp, status_reg);
break;
/* For downstream facing ports (these): one hub port is put
* into test mode according to USB2 11.24.2.13, then the hub
* must be reset (which for root hub now means rmmod+modprobe,
* or else system reboot). See EHCI 2.3.9 and 4.14 for info
* about the EHCI-specific stuff.
*/
case USB_PORT_FEAT_TEST:
if (!selector || selector > 5)
goto error;
ehci_quiesce(oxu);
ehci_halt(oxu);
temp |= selector << 16;
writel(temp, status_reg);
break;
default:
goto error;
}
readl(&oxu->regs->command); /* unblock posted writes */
break;
default:
error:
/* "stall" on error */
retval = -EPIPE;
}
spin_unlock_irqrestore(&oxu->lock, flags);
return retval;
}
#ifdef CONFIG_PM
static int oxu_bus_suspend(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
int port;
int mask;
oxu_dbg(oxu, "suspend root hub\n");
if (time_before(jiffies, oxu->next_statechange))
msleep(5);
port = HCS_N_PORTS(oxu->hcs_params);
spin_lock_irq(&oxu->lock);
/* stop schedules, clean any completed work */
if (HC_IS_RUNNING(hcd->state)) {
ehci_quiesce(oxu);
hcd->state = HC_STATE_QUIESCING;
}
oxu->command = readl(&oxu->regs->command);
if (oxu->reclaim)
oxu->reclaim_ready = 1;
ehci_work(oxu);
/* Unlike other USB host controller types, EHCI doesn't have
* any notion of "global" or bus-wide suspend. The driver has
* to manually suspend all the active unsuspended ports, and
* then manually resume them in the bus_resume() routine.
*/
oxu->bus_suspended = 0;
while (port--) {
u32 __iomem *reg = &oxu->regs->port_status[port];
u32 t1 = readl(reg) & ~PORT_RWC_BITS;
u32 t2 = t1;
/* keep track of which ports we suspend */
if ((t1 & PORT_PE) && !(t1 & PORT_OWNER) &&
!(t1 & PORT_SUSPEND)) {
t2 |= PORT_SUSPEND;
set_bit(port, &oxu->bus_suspended);
}
/* enable remote wakeup on all ports */
if (device_may_wakeup(&hcd->self.root_hub->dev))
t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
else
t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
if (t1 != t2) {
oxu_vdbg(oxu, "port %d, %08x -> %08x\n",
port + 1, t1, t2);
writel(t2, reg);
}
}
/* turn off now-idle HC */
del_timer_sync(&oxu->watchdog);
ehci_halt(oxu);
hcd->state = HC_STATE_SUSPENDED;
/* allow remote wakeup */
mask = INTR_MASK;
if (!device_may_wakeup(&hcd->self.root_hub->dev))
mask &= ~STS_PCD;
writel(mask, &oxu->regs->intr_enable);
readl(&oxu->regs->intr_enable);
oxu->next_statechange = jiffies + msecs_to_jiffies(10);
spin_unlock_irq(&oxu->lock);
return 0;
}
/* Caller has locked the root hub, and should reset/reinit on error */
static int oxu_bus_resume(struct usb_hcd *hcd)
{
struct oxu_hcd *oxu = hcd_to_oxu(hcd);
u32 temp;
int i;
if (time_before(jiffies, oxu->next_statechange))
msleep(5);
spin_lock_irq(&oxu->lock);
/* Ideally and we've got a real resume here, and no port's power
* was lost. (For PCI, that means Vaux was maintained.) But we
* could instead be restoring a swsusp snapshot -- so that BIOS was
* the last user of the controller, not reset/pm hardware keeping
* state we gave to it.
*/
temp = readl(&oxu->regs->intr_enable);
oxu_dbg(oxu, "resume root hub%s\n", temp ? "" : " after power loss");
/* at least some APM implementations will try to deliver
* IRQs right away, so delay them until we're ready.
*/
writel(0, &oxu->regs->intr_enable);
/* re-init operational registers */
writel(0, &oxu->regs->segment);
writel(oxu->periodic_dma, &oxu->regs->frame_list);
writel((u32) oxu->async->qh_dma, &oxu->regs->async_next);
/* restore CMD_RUN, framelist size, and irq threshold */
writel(oxu->command, &oxu->regs->command);
/* Some controller/firmware combinations need a delay during which
* they set up the port statuses. See Bugzilla #8190. */
mdelay(8);
/* manually resume the ports we suspended during bus_suspend() */
i = HCS_N_PORTS(oxu->hcs_params);
while (i--) {
temp = readl(&oxu->regs->port_status[i]);
temp &= ~(PORT_RWC_BITS
| PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
if (test_bit(i, &oxu->bus_suspended) && (temp & PORT_SUSPEND)) {
oxu->reset_done[i] = jiffies + msecs_to_jiffies(20);
temp |= PORT_RESUME;
}
writel(temp, &oxu->regs->port_status[i]);
}
i = HCS_N_PORTS(oxu->hcs_params);
mdelay(20);
while (i--) {
temp = readl(&oxu->regs->port_status[i]);
if (test_bit(i, &oxu->bus_suspended) && (temp & PORT_SUSPEND)) {
temp &= ~(PORT_RWC_BITS | PORT_RESUME);
writel(temp, &oxu->regs->port_status[i]);
oxu_vdbg(oxu, "resumed port %d\n", i + 1);
}
}
(void) readl(&oxu->regs->command);
/* maybe re-activate the schedule(s) */
temp = 0;
if (oxu->async->qh_next.qh)
temp |= CMD_ASE;
if (oxu->periodic_sched)
temp |= CMD_PSE;
if (temp) {
oxu->command |= temp;
writel(oxu->command, &oxu->regs->command);
}
oxu->next_statechange = jiffies + msecs_to_jiffies(5);
hcd->state = HC_STATE_RUNNING;
/* Now we can safely re-enable irqs */
writel(INTR_MASK, &oxu->regs->intr_enable);
spin_unlock_irq(&oxu->lock);
return 0;
}
#else
static int oxu_bus_suspend(struct usb_hcd *hcd)
{
return 0;
}
static int oxu_bus_resume(struct usb_hcd *hcd)
{
return 0;
}
#endif /* CONFIG_PM */
static const struct hc_driver oxu_hc_driver = {
.description = "oxu210hp_hcd",
.product_desc = "oxu210hp HCD",
.hcd_priv_size = sizeof(struct oxu_hcd),
/*
* Generic hardware linkage
*/
.irq = oxu_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* Basic lifecycle operations
*/
.reset = oxu_reset,
.start = oxu_run,
.stop = oxu_stop,
.shutdown = oxu_shutdown,
/*
* Managing i/o requests and associated device resources
*/
.urb_enqueue = oxu_urb_enqueue,
.urb_dequeue = oxu_urb_dequeue,
.endpoint_disable = oxu_endpoint_disable,
/*
* Scheduling support
*/
.get_frame_number = oxu_get_frame,
/*
* Root hub support
*/
.hub_status_data = oxu_hub_status_data,
.hub_control = oxu_hub_control,
.bus_suspend = oxu_bus_suspend,
.bus_resume = oxu_bus_resume,
};
/*
* Module stuff
*/
static void oxu_configuration(struct platform_device *pdev, void *base)
{
u32 tmp;
/* Initialize top level registers.
* First write ever
*/
oxu_writel(base, OXU_HOSTIFCONFIG, 0x0000037D);
oxu_writel(base, OXU_SOFTRESET, OXU_SRESET);
oxu_writel(base, OXU_HOSTIFCONFIG, 0x0000037D);
tmp = oxu_readl(base, OXU_PIOBURSTREADCTRL);
oxu_writel(base, OXU_PIOBURSTREADCTRL, tmp | 0x0040);
oxu_writel(base, OXU_ASO, OXU_SPHPOEN | OXU_OVRCCURPUPDEN |
OXU_COMPARATOR | OXU_ASO_OP);
tmp = oxu_readl(base, OXU_CLKCTRL_SET);
oxu_writel(base, OXU_CLKCTRL_SET, tmp | OXU_SYSCLKEN | OXU_USBOTGCLKEN);
/* Clear all top interrupt enable */
oxu_writel(base, OXU_CHIPIRQEN_CLR, 0xff);
/* Clear all top interrupt status */
oxu_writel(base, OXU_CHIPIRQSTATUS, 0xff);
/* Enable all needed top interrupt except OTG SPH core */
oxu_writel(base, OXU_CHIPIRQEN_SET, OXU_USBSPHLPWUI | OXU_USBOTGLPWUI);
}
static int oxu_verify_id(struct platform_device *pdev, void *base)
{
u32 id;
char *bo[] = {
"reserved",
"128-pin LQFP",
"84-pin TFBGA",
"reserved",
};
/* Read controller signature register to find a match */
id = oxu_readl(base, OXU_DEVICEID);
dev_info(&pdev->dev, "device ID %x\n", id);
if ((id & OXU_REV_MASK) != (OXU_REV_2100 << OXU_REV_SHIFT))
return -1;
dev_info(&pdev->dev, "found device %x %s (%04x:%04x)\n",
id >> OXU_REV_SHIFT,
bo[(id & OXU_BO_MASK) >> OXU_BO_SHIFT],
(id & OXU_MAJ_REV_MASK) >> OXU_MAJ_REV_SHIFT,
(id & OXU_MIN_REV_MASK) >> OXU_MIN_REV_SHIFT);
return 0;
}
static const struct hc_driver oxu_hc_driver;
static struct usb_hcd *oxu_create(struct platform_device *pdev,
unsigned long memstart, unsigned long memlen,
void *base, int irq, int otg)
{
struct device *dev = &pdev->dev;
struct usb_hcd *hcd;
struct oxu_hcd *oxu;
int ret;
/* Set endian mode and host mode */
oxu_writel(base + (otg ? OXU_OTG_CORE_OFFSET : OXU_SPH_CORE_OFFSET),
OXU_USBMODE,
OXU_CM_HOST_ONLY | OXU_ES_LITTLE | OXU_VBPS);
hcd = usb_create_hcd(&oxu_hc_driver, dev,
otg ? "oxu210hp_otg" : "oxu210hp_sph");
if (!hcd)
return ERR_PTR(-ENOMEM);
hcd->rsrc_start = memstart;
hcd->rsrc_len = memlen;
hcd->regs = base;
hcd->irq = irq;
hcd->state = HC_STATE_HALT;
oxu = hcd_to_oxu(hcd);
oxu->is_otg = otg;
ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (ret < 0)
return ERR_PTR(ret);
return hcd;
}
static int oxu_init(struct platform_device *pdev,
unsigned long memstart, unsigned long memlen,
void *base, int irq)
{
struct oxu_info *info = platform_get_drvdata(pdev);
struct usb_hcd *hcd;
int ret;
/* First time configuration at start up */
oxu_configuration(pdev, base);
ret = oxu_verify_id(pdev, base);
if (ret) {
dev_err(&pdev->dev, "no devices found!\n");
return -ENODEV;
}
/* Create the OTG controller */
hcd = oxu_create(pdev, memstart, memlen, base, irq, 1);
if (IS_ERR(hcd)) {
dev_err(&pdev->dev, "cannot create OTG controller!\n");
ret = PTR_ERR(hcd);
goto error_create_otg;
}
info->hcd[0] = hcd;
/* Create the SPH host controller */
hcd = oxu_create(pdev, memstart, memlen, base, irq, 0);
if (IS_ERR(hcd)) {
dev_err(&pdev->dev, "cannot create SPH controller!\n");
ret = PTR_ERR(hcd);
goto error_create_sph;
}
info->hcd[1] = hcd;
oxu_writel(base, OXU_CHIPIRQEN_SET,
oxu_readl(base, OXU_CHIPIRQEN_SET) | 3);
return 0;
error_create_sph:
usb_remove_hcd(info->hcd[0]);
usb_put_hcd(info->hcd[0]);
error_create_otg:
return ret;
}
static int oxu_drv_probe(struct platform_device *pdev)
{
struct resource *res;
void *base;
unsigned long memstart, memlen;
int irq, ret;
struct oxu_info *info;
if (usb_disabled())
return -ENODEV;
/*
* Get the platform resources
*/
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res) {
dev_err(&pdev->dev,
"no IRQ! Check %s setup!\n", dev_name(&pdev->dev));
return -ENODEV;
}
irq = res->start;
dev_dbg(&pdev->dev, "IRQ resource %d\n", irq);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "no registers address! Check %s setup!\n",
dev_name(&pdev->dev));
return -ENODEV;
}
memstart = res->start;
memlen = res->end - res->start + 1;
dev_dbg(&pdev->dev, "MEM resource %lx-%lx\n", memstart, memlen);
if (!request_mem_region(memstart, memlen,
oxu_hc_driver.description)) {
dev_dbg(&pdev->dev, "memory area already in use\n");
return -EBUSY;
}
ret = set_irq_type(irq, IRQF_TRIGGER_FALLING);
if (ret) {
dev_err(&pdev->dev, "error setting irq type\n");
ret = -EFAULT;
goto error_set_irq_type;
}
base = ioremap(memstart, memlen);
if (!base) {
dev_dbg(&pdev->dev, "error mapping memory\n");
ret = -EFAULT;
goto error_ioremap;
}
/* Allocate a driver data struct to hold useful info for both
* SPH & OTG devices
*/
info = kzalloc(sizeof(struct oxu_info), GFP_KERNEL);
if (!info) {
dev_dbg(&pdev->dev, "error allocating memory\n");
ret = -EFAULT;
goto error_alloc;
}
platform_set_drvdata(pdev, info);
ret = oxu_init(pdev, memstart, memlen, base, irq);
if (ret < 0) {
dev_dbg(&pdev->dev, "cannot init USB devices\n");
goto error_init;
}
dev_info(&pdev->dev, "devices enabled and running\n");
platform_set_drvdata(pdev, info);
return 0;
error_init:
kfree(info);
platform_set_drvdata(pdev, NULL);
error_alloc:
iounmap(base);
error_set_irq_type:
error_ioremap:
release_mem_region(memstart, memlen);
dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
return ret;
}
static void oxu_remove(struct platform_device *pdev, struct usb_hcd *hcd)
{
usb_remove_hcd(hcd);
usb_put_hcd(hcd);
}
static int oxu_drv_remove(struct platform_device *pdev)
{
struct oxu_info *info = platform_get_drvdata(pdev);
unsigned long memstart = info->hcd[0]->rsrc_start,
memlen = info->hcd[0]->rsrc_len;
void *base = info->hcd[0]->regs;
oxu_remove(pdev, info->hcd[0]);
oxu_remove(pdev, info->hcd[1]);
iounmap(base);
release_mem_region(memstart, memlen);
kfree(info);
platform_set_drvdata(pdev, NULL);
return 0;
}
static void oxu_drv_shutdown(struct platform_device *pdev)
{
oxu_drv_remove(pdev);
}
#if 0
/* FIXME: TODO */
static int oxu_drv_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct usb_hcd *hcd = dev_get_drvdata(dev);
return 0;
}
static int oxu_drv_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct usb_hcd *hcd = dev_get_drvdata(dev);
return 0;
}
#else
#define oxu_drv_suspend NULL
#define oxu_drv_resume NULL
#endif
static struct platform_driver oxu_driver = {
.probe = oxu_drv_probe,
.remove = oxu_drv_remove,
.shutdown = oxu_drv_shutdown,
.suspend = oxu_drv_suspend,
.resume = oxu_drv_resume,
.driver = {
.name = "oxu210hp-hcd",
.bus = &platform_bus_type
}
};
static int __init oxu_module_init(void)
{
int retval = 0;
retval = platform_driver_register(&oxu_driver);
if (retval < 0)
return retval;
return retval;
}
static void __exit oxu_module_cleanup(void)
{
platform_driver_unregister(&oxu_driver);
}
module_init(oxu_module_init);
module_exit(oxu_module_cleanup);
MODULE_DESCRIPTION("Oxford OXU210HP HCD driver - ver. " DRIVER_VERSION);
MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_LICENSE("GPL");
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