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fotg210-hcd.c
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fotg210-hcd.c
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// SPDX-License-Identifier: GPL-2.0+
/* Faraday FOTG210 EHCI-like driver
*
* Copyright (c) 2013 Faraday Technology Corporation
*
* Author: Yuan-Hsin Chen <yhchen@faraday-tech.com>
* Feng-Hsin Chiang <john453@faraday-tech.com>
* Po-Yu Chuang <ratbert.chuang@gmail.com>
*
* Most of code borrowed from the Linux-3.7 EHCI driver
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/dmapool.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/hrtimer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/unaligned.h>
#define DRIVER_AUTHOR "Yuan-Hsin Chen"
#define DRIVER_DESC "FOTG210 Host Controller (EHCI) Driver"
static const char hcd_name[] = "fotg210_hcd";
#undef FOTG210_URB_TRACE
#define FOTG210_STATS
/* magic numbers that can affect system performance */
#define FOTG210_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
#define FOTG210_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
#define FOTG210_TUNE_RL_TT 0
#define FOTG210_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
#define FOTG210_TUNE_MULT_TT 1
/* Some drivers think it's safe to schedule isochronous transfers more than 256
* ms into the future (partly as a result of an old bug in the scheduling
* code). In an attempt to avoid trouble, we will use a minimum scheduling
* length of 512 frames instead of 256.
*/
#define FOTG210_TUNE_FLS 1 /* (medium) 512-frame schedule */
/* 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 link power management(LPM) feature */
static unsigned int hird;
module_param(hird, int, S_IRUGO);
MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");
#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
#include "fotg210.h"
#define fotg210_dbg(fotg210, fmt, args...) \
dev_dbg(fotg210_to_hcd(fotg210)->self.controller, fmt, ## args)
#define fotg210_err(fotg210, fmt, args...) \
dev_err(fotg210_to_hcd(fotg210)->self.controller, fmt, ## args)
#define fotg210_info(fotg210, fmt, args...) \
dev_info(fotg210_to_hcd(fotg210)->self.controller, fmt, ## args)
#define fotg210_warn(fotg210, fmt, args...) \
dev_warn(fotg210_to_hcd(fotg210)->self.controller, fmt, ## args)
/* check the values in the HCSPARAMS register (host controller _Structural_
* parameters) see EHCI spec, Table 2-4 for each value
*/
static void dbg_hcs_params(struct fotg210_hcd *fotg210, char *label)
{
u32 params = fotg210_readl(fotg210, &fotg210->caps->hcs_params);
fotg210_dbg(fotg210, "%s hcs_params 0x%x ports=%d\n", label, params,
HCS_N_PORTS(params));
}
/* check the values in the HCCPARAMS register (host controller _Capability_
* parameters) see EHCI Spec, Table 2-5 for each value
*/
static void dbg_hcc_params(struct fotg210_hcd *fotg210, char *label)
{
u32 params = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
fotg210_dbg(fotg210, "%s hcc_params %04x uframes %s%s\n", label,
params,
HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
HCC_CANPARK(params) ? " park" : "");
}
static void __maybe_unused
dbg_qtd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd)
{
fotg210_dbg(fotg210, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
hc32_to_cpup(fotg210, &qtd->hw_next),
hc32_to_cpup(fotg210, &qtd->hw_alt_next),
hc32_to_cpup(fotg210, &qtd->hw_token),
hc32_to_cpup(fotg210, &qtd->hw_buf[0]));
if (qtd->hw_buf[1])
fotg210_dbg(fotg210, " p1=%08x p2=%08x p3=%08x p4=%08x\n",
hc32_to_cpup(fotg210, &qtd->hw_buf[1]),
hc32_to_cpup(fotg210, &qtd->hw_buf[2]),
hc32_to_cpup(fotg210, &qtd->hw_buf[3]),
hc32_to_cpup(fotg210, &qtd->hw_buf[4]));
}
static void __maybe_unused
dbg_qh(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
{
struct fotg210_qh_hw *hw = qh->hw;
fotg210_dbg(fotg210, "%s qh %p n%08x info %x %x qtd %x\n", label, qh,
hw->hw_next, hw->hw_info1, hw->hw_info2,
hw->hw_current);
dbg_qtd("overlay", fotg210, (struct fotg210_qtd *) &hw->hw_qtd_next);
}
static void __maybe_unused
dbg_itd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_itd *itd)
{
fotg210_dbg(fotg210, "%s[%d] itd %p, next %08x, urb %p\n", label,
itd->frame, itd, hc32_to_cpu(fotg210, itd->hw_next),
itd->urb);
fotg210_dbg(fotg210,
" trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
hc32_to_cpu(fotg210, itd->hw_transaction[0]),
hc32_to_cpu(fotg210, itd->hw_transaction[1]),
hc32_to_cpu(fotg210, itd->hw_transaction[2]),
hc32_to_cpu(fotg210, itd->hw_transaction[3]),
hc32_to_cpu(fotg210, itd->hw_transaction[4]),
hc32_to_cpu(fotg210, itd->hw_transaction[5]),
hc32_to_cpu(fotg210, itd->hw_transaction[6]),
hc32_to_cpu(fotg210, itd->hw_transaction[7]));
fotg210_dbg(fotg210,
" buf: %08x %08x %08x %08x %08x %08x %08x\n",
hc32_to_cpu(fotg210, itd->hw_bufp[0]),
hc32_to_cpu(fotg210, itd->hw_bufp[1]),
hc32_to_cpu(fotg210, itd->hw_bufp[2]),
hc32_to_cpu(fotg210, itd->hw_bufp[3]),
hc32_to_cpu(fotg210, itd->hw_bufp[4]),
hc32_to_cpu(fotg210, itd->hw_bufp[5]),
hc32_to_cpu(fotg210, itd->hw_bufp[6]));
fotg210_dbg(fotg210, " index: %d %d %d %d %d %d %d %d\n",
itd->index[0], itd->index[1], itd->index[2],
itd->index[3], itd->index[4], itd->index[5],
itd->index[6], itd->index[7]);
}
static int __maybe_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 __maybe_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 %07x %s=%d ithresh=%d%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_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 char *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";
break; /* low speed */
case 2 << 10:
sig = "j";
break;
default:
sig = "?";
break;
}
scnprintf(buf, len, "%s%sport:%d status %06x %d sig=%s%s%s%s%s%s%s%s",
label, label[0] ? " " : "", port, status,
status >> 25, /*device address */
sig,
(status & PORT_RESET) ? " RESET" : "",
(status & PORT_SUSPEND) ? " SUSPEND" : "",
(status & PORT_RESUME) ? " RESUME" : "",
(status & PORT_PEC) ? " PEC" : "",
(status & PORT_PE) ? " PE" : "",
(status & PORT_CSC) ? " CSC" : "",
(status & PORT_CONNECT) ? " CONNECT" : "");
return buf;
}
/* functions have the "wrong" filename when they're output... */
#define dbg_status(fotg210, label, status) { \
char _buf[80]; \
dbg_status_buf(_buf, sizeof(_buf), label, status); \
fotg210_dbg(fotg210, "%s\n", _buf); \
}
#define dbg_cmd(fotg210, label, command) { \
char _buf[80]; \
dbg_command_buf(_buf, sizeof(_buf), label, command); \
fotg210_dbg(fotg210, "%s\n", _buf); \
}
#define dbg_port(fotg210, label, port, status) { \
char _buf[80]; \
fotg210_dbg(fotg210, "%s\n", \
dbg_port_buf(_buf, sizeof(_buf), label, port, status));\
}
/* troubleshooting help: expose state in debugfs */
static int debug_async_open(struct inode *, struct file *);
static int debug_periodic_open(struct inode *, struct file *);
static int debug_registers_open(struct inode *, struct file *);
static int debug_async_open(struct inode *, struct file *);
static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
static int debug_close(struct inode *, struct file *);
static const struct file_operations debug_async_fops = {
.owner = THIS_MODULE,
.open = debug_async_open,
.read = debug_output,
.release = debug_close,
.llseek = default_llseek,
};
static const struct file_operations debug_periodic_fops = {
.owner = THIS_MODULE,
.open = debug_periodic_open,
.read = debug_output,
.release = debug_close,
.llseek = default_llseek,
};
static const struct file_operations debug_registers_fops = {
.owner = THIS_MODULE,
.open = debug_registers_open,
.read = debug_output,
.release = debug_close,
.llseek = default_llseek,
};
static struct dentry *fotg210_debug_root;
struct debug_buffer {
ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
struct usb_bus *bus;
struct mutex mutex; /* protect filling of buffer */
size_t count; /* number of characters filled into buffer */
char *output_buf;
size_t alloc_size;
};
static inline char speed_char(u32 scratch)
{
switch (scratch & (3 << 12)) {
case QH_FULL_SPEED:
return 'f';
case QH_LOW_SPEED:
return 'l';
case QH_HIGH_SPEED:
return 'h';
default:
return '?';
}
}
static inline char token_mark(struct fotg210_hcd *fotg210, __hc32 token)
{
__u32 v = hc32_to_cpu(fotg210, token);
if (v & QTD_STS_ACTIVE)
return '*';
if (v & QTD_STS_HALT)
return '-';
if (!IS_SHORT_READ(v))
return ' ';
/* tries to advance through hw_alt_next */
return '/';
}
static void qh_lines(struct fotg210_hcd *fotg210, struct fotg210_qh *qh,
char **nextp, unsigned *sizep)
{
u32 scratch;
u32 hw_curr;
struct fotg210_qtd *td;
unsigned temp;
unsigned size = *sizep;
char *next = *nextp;
char mark;
__le32 list_end = FOTG210_LIST_END(fotg210);
struct fotg210_qh_hw *hw = qh->hw;
if (hw->hw_qtd_next == list_end) /* NEC does this */
mark = '@';
else
mark = token_mark(fotg210, hw->hw_token);
if (mark == '/') { /* qh_alt_next controls qh advance? */
if ((hw->hw_alt_next & QTD_MASK(fotg210)) ==
fotg210->async->hw->hw_alt_next)
mark = '#'; /* blocked */
else if (hw->hw_alt_next == list_end)
mark = '.'; /* use hw_qtd_next */
/* else alt_next points to some other qtd */
}
scratch = hc32_to_cpup(fotg210, &hw->hw_info1);
hw_curr = (mark == '*') ? hc32_to_cpup(fotg210, &hw->hw_current) : 0;
temp = scnprintf(next, size,
"qh/%p dev%d %cs ep%d %08x %08x(%08x%c %s nak%d)",
qh, scratch & 0x007f,
speed_char(scratch),
(scratch >> 8) & 0x000f,
scratch, hc32_to_cpup(fotg210, &hw->hw_info2),
hc32_to_cpup(fotg210, &hw->hw_token), mark,
(cpu_to_hc32(fotg210, QTD_TOGGLE) & hw->hw_token)
? "data1" : "data0",
(hc32_to_cpup(fotg210, &hw->hw_alt_next) >> 1) & 0x0f);
size -= temp;
next += temp;
/* hc may be modifying the list as we read it ... */
list_for_each_entry(td, &qh->qtd_list, qtd_list) {
scratch = hc32_to_cpup(fotg210, &td->hw_token);
mark = ' ';
if (hw_curr == td->qtd_dma)
mark = '*';
else if (hw->hw_qtd_next == cpu_to_hc32(fotg210, td->qtd_dma))
mark = '+';
else if (QTD_LENGTH(scratch)) {
if (td->hw_alt_next == fotg210->async->hw->hw_alt_next)
mark = '#';
else if (td->hw_alt_next != list_end)
mark = '/';
}
temp = snprintf(next, size,
"\n\t%p%c%s len=%d %08x urb %p",
td, mark, ({ char *tmp;
switch ((scratch>>8)&0x03) {
case 0:
tmp = "out";
break;
case 1:
tmp = "in";
break;
case 2:
tmp = "setup";
break;
default:
tmp = "?";
break;
} tmp; }),
(scratch >> 16) & 0x7fff,
scratch,
td->urb);
if (size < temp)
temp = size;
size -= temp;
next += temp;
if (temp == size)
goto done;
}
temp = snprintf(next, size, "\n");
if (size < temp)
temp = size;
size -= temp;
next += temp;
done:
*sizep = size;
*nextp = next;
}
static ssize_t fill_async_buffer(struct debug_buffer *buf)
{
struct usb_hcd *hcd;
struct fotg210_hcd *fotg210;
unsigned long flags;
unsigned temp, size;
char *next;
struct fotg210_qh *qh;
hcd = bus_to_hcd(buf->bus);
fotg210 = hcd_to_fotg210(hcd);
next = buf->output_buf;
size = buf->alloc_size;
*next = 0;
/* dumps a snapshot of the async schedule.
* usually empty except for long-term bulk reads, or head.
* one QH per line, and TDs we know about
*/
spin_lock_irqsave(&fotg210->lock, flags);
for (qh = fotg210->async->qh_next.qh; size > 0 && qh;
qh = qh->qh_next.qh)
qh_lines(fotg210, qh, &next, &size);
if (fotg210->async_unlink && size > 0) {
temp = scnprintf(next, size, "\nunlink =\n");
size -= temp;
next += temp;
for (qh = fotg210->async_unlink; size > 0 && qh;
qh = qh->unlink_next)
qh_lines(fotg210, qh, &next, &size);
}
spin_unlock_irqrestore(&fotg210->lock, flags);
return strlen(buf->output_buf);
}
/* count tds, get ep direction */
static unsigned output_buf_tds_dir(char *buf, struct fotg210_hcd *fotg210,
struct fotg210_qh_hw *hw, struct fotg210_qh *qh, unsigned size)
{
u32 scratch = hc32_to_cpup(fotg210, &hw->hw_info1);
struct fotg210_qtd *qtd;
char *type = "";
unsigned temp = 0;
/* count tds, get ep direction */
list_for_each_entry(qtd, &qh->qtd_list, qtd_list) {
temp++;
switch ((hc32_to_cpu(fotg210, qtd->hw_token) >> 8) & 0x03) {
case 0:
type = "out";
continue;
case 1:
type = "in";
continue;
}
}
return scnprintf(buf, size, "(%c%d ep%d%s [%d/%d] q%d p%d)",
speed_char(scratch), scratch & 0x007f,
(scratch >> 8) & 0x000f, type, qh->usecs,
qh->c_usecs, temp, (scratch >> 16) & 0x7ff);
}
#define DBG_SCHED_LIMIT 64
static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
{
struct usb_hcd *hcd;
struct fotg210_hcd *fotg210;
unsigned long flags;
union fotg210_shadow p, *seen;
unsigned temp, size, seen_count;
char *next;
unsigned i;
__hc32 tag;
seen = kmalloc_array(DBG_SCHED_LIMIT, sizeof(*seen), GFP_ATOMIC);
if (!seen)
return 0;
seen_count = 0;
hcd = bus_to_hcd(buf->bus);
fotg210 = hcd_to_fotg210(hcd);
next = buf->output_buf;
size = buf->alloc_size;
temp = scnprintf(next, size, "size = %d\n", fotg210->periodic_size);
size -= temp;
next += temp;
/* dump a snapshot of the periodic schedule.
* iso changes, interrupt usually doesn't.
*/
spin_lock_irqsave(&fotg210->lock, flags);
for (i = 0; i < fotg210->periodic_size; i++) {
p = fotg210->pshadow[i];
if (likely(!p.ptr))
continue;
tag = Q_NEXT_TYPE(fotg210, fotg210->periodic[i]);
temp = scnprintf(next, size, "%4d: ", i);
size -= temp;
next += temp;
do {
struct fotg210_qh_hw *hw;
switch (hc32_to_cpu(fotg210, tag)) {
case Q_TYPE_QH:
hw = p.qh->hw;
temp = scnprintf(next, size, " qh%d-%04x/%p",
p.qh->period,
hc32_to_cpup(fotg210,
&hw->hw_info2)
/* uframe masks */
& (QH_CMASK | QH_SMASK),
p.qh);
size -= temp;
next += temp;
/* don't repeat what follows this qh */
for (temp = 0; temp < seen_count; temp++) {
if (seen[temp].ptr != p.ptr)
continue;
if (p.qh->qh_next.ptr) {
temp = scnprintf(next, size,
" ...");
size -= temp;
next += temp;
}
break;
}
/* show more info the first time around */
if (temp == seen_count) {
temp = output_buf_tds_dir(next,
fotg210, hw,
p.qh, size);
if (seen_count < DBG_SCHED_LIMIT)
seen[seen_count++].qh = p.qh;
} else
temp = 0;
tag = Q_NEXT_TYPE(fotg210, hw->hw_next);
p = p.qh->qh_next;
break;
case Q_TYPE_FSTN:
temp = scnprintf(next, size,
" fstn-%8x/%p",
p.fstn->hw_prev, p.fstn);
tag = Q_NEXT_TYPE(fotg210, p.fstn->hw_next);
p = p.fstn->fstn_next;
break;
case Q_TYPE_ITD:
temp = scnprintf(next, size,
" itd/%p", p.itd);
tag = Q_NEXT_TYPE(fotg210, p.itd->hw_next);
p = p.itd->itd_next;
break;
}
size -= temp;
next += temp;
} while (p.ptr);
temp = scnprintf(next, size, "\n");
size -= temp;
next += temp;
}
spin_unlock_irqrestore(&fotg210->lock, flags);
kfree(seen);
return buf->alloc_size - size;
}
#undef DBG_SCHED_LIMIT
static const char *rh_state_string(struct fotg210_hcd *fotg210)
{
switch (fotg210->rh_state) {
case FOTG210_RH_HALTED:
return "halted";
case FOTG210_RH_SUSPENDED:
return "suspended";
case FOTG210_RH_RUNNING:
return "running";
case FOTG210_RH_STOPPING:
return "stopping";
}
return "?";
}
static ssize_t fill_registers_buffer(struct debug_buffer *buf)
{
struct usb_hcd *hcd;
struct fotg210_hcd *fotg210;
unsigned long flags;
unsigned temp, size, i;
char *next, scratch[80];
static const char fmt[] = "%*s\n";
static const char label[] = "";
hcd = bus_to_hcd(buf->bus);
fotg210 = hcd_to_fotg210(hcd);
next = buf->output_buf;
size = buf->alloc_size;
spin_lock_irqsave(&fotg210->lock, flags);
if (!HCD_HW_ACCESSIBLE(hcd)) {
size = scnprintf(next, size,
"bus %s, device %s\n"
"%s\n"
"SUSPENDED(no register access)\n",
hcd->self.controller->bus->name,
dev_name(hcd->self.controller),
hcd->product_desc);
goto done;
}
/* Capability Registers */
i = HC_VERSION(fotg210, fotg210_readl(fotg210,
&fotg210->caps->hc_capbase));
temp = scnprintf(next, size,
"bus %s, device %s\n"
"%s\n"
"EHCI %x.%02x, rh state %s\n",
hcd->self.controller->bus->name,
dev_name(hcd->self.controller),
hcd->product_desc,
i >> 8, i & 0x0ff, rh_state_string(fotg210));
size -= temp;
next += temp;
/* FIXME interpret both types of params */
i = fotg210_readl(fotg210, &fotg210->caps->hcs_params);
temp = scnprintf(next, size, "structural params 0x%08x\n", i);
size -= temp;
next += temp;
i = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
temp = scnprintf(next, size, "capability params 0x%08x\n", i);
size -= temp;
next += temp;
/* Operational Registers */
temp = dbg_status_buf(scratch, sizeof(scratch), label,
fotg210_readl(fotg210, &fotg210->regs->status));
temp = scnprintf(next, size, fmt, temp, scratch);
size -= temp;
next += temp;
temp = dbg_command_buf(scratch, sizeof(scratch), label,
fotg210_readl(fotg210, &fotg210->regs->command));
temp = scnprintf(next, size, fmt, temp, scratch);
size -= temp;
next += temp;
temp = dbg_intr_buf(scratch, sizeof(scratch), label,
fotg210_readl(fotg210, &fotg210->regs->intr_enable));
temp = scnprintf(next, size, fmt, temp, scratch);
size -= temp;
next += temp;
temp = scnprintf(next, size, "uframe %04x\n",
fotg210_read_frame_index(fotg210));
size -= temp;
next += temp;
if (fotg210->async_unlink) {
temp = scnprintf(next, size, "async unlink qh %p\n",
fotg210->async_unlink);
size -= temp;
next += temp;
}
#ifdef FOTG210_STATS
temp = scnprintf(next, size,
"irq normal %ld err %ld iaa %ld(lost %ld)\n",
fotg210->stats.normal, fotg210->stats.error,
fotg210->stats.iaa, fotg210->stats.lost_iaa);
size -= temp;
next += temp;
temp = scnprintf(next, size, "complete %ld unlink %ld\n",
fotg210->stats.complete, fotg210->stats.unlink);
size -= temp;
next += temp;
#endif
done:
spin_unlock_irqrestore(&fotg210->lock, flags);
return buf->alloc_size - size;
}
static struct debug_buffer
*alloc_buffer(struct usb_bus *bus, ssize_t (*fill_func)(struct debug_buffer *))
{
struct debug_buffer *buf;
buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
if (buf) {
buf->bus = bus;
buf->fill_func = fill_func;
mutex_init(&buf->mutex);
buf->alloc_size = PAGE_SIZE;
}
return buf;
}
static int fill_buffer(struct debug_buffer *buf)
{
int ret = 0;
if (!buf->output_buf)
buf->output_buf = vmalloc(buf->alloc_size);
if (!buf->output_buf) {
ret = -ENOMEM;
goto out;
}
ret = buf->fill_func(buf);
if (ret >= 0) {
buf->count = ret;
ret = 0;
}
out:
return ret;
}
static ssize_t debug_output(struct file *file, char __user *user_buf,
size_t len, loff_t *offset)
{
struct debug_buffer *buf = file->private_data;
int ret = 0;
mutex_lock(&buf->mutex);
if (buf->count == 0) {
ret = fill_buffer(buf);
if (ret != 0) {
mutex_unlock(&buf->mutex);
goto out;
}
}
mutex_unlock(&buf->mutex);
ret = simple_read_from_buffer(user_buf, len, offset,
buf->output_buf, buf->count);
out:
return ret;
}
static int debug_close(struct inode *inode, struct file *file)
{
struct debug_buffer *buf = file->private_data;
if (buf) {
vfree(buf->output_buf);
kfree(buf);
}
return 0;
}
static int debug_async_open(struct inode *inode, struct file *file)
{
file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
return file->private_data ? 0 : -ENOMEM;
}
static int debug_periodic_open(struct inode *inode, struct file *file)
{
struct debug_buffer *buf;
buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
if (!buf)
return -ENOMEM;
buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
file->private_data = buf;
return 0;
}
static int debug_registers_open(struct inode *inode, struct file *file)
{
file->private_data = alloc_buffer(inode->i_private,
fill_registers_buffer);
return file->private_data ? 0 : -ENOMEM;
}
static inline void create_debug_files(struct fotg210_hcd *fotg210)
{
struct usb_bus *bus = &fotg210_to_hcd(fotg210)->self;
struct dentry *root;
root = debugfs_create_dir(bus->bus_name, fotg210_debug_root);
fotg210->debug_dir = root;
debugfs_create_file("async", S_IRUGO, root, bus, &debug_async_fops);
debugfs_create_file("periodic", S_IRUGO, root, bus,
&debug_periodic_fops);
debugfs_create_file("registers", S_IRUGO, root, bus,
&debug_registers_fops);
}
static inline void remove_debug_files(struct fotg210_hcd *fotg210)
{
debugfs_remove_recursive(fotg210->debug_dir);
}
/* 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 fotg210_hcd *fotg210, void __iomem *ptr,
u32 mask, u32 done, int usec)
{
u32 result;
do {
result = fotg210_readl(fotg210, 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).
* Must be called with interrupts enabled and the lock not held.
*/
static int fotg210_halt(struct fotg210_hcd *fotg210)
{
u32 temp;
spin_lock_irq(&fotg210->lock);
/* disable any irqs left enabled by previous code */
fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);
/*
* This routine gets called during probe before fotg210->command
* has been initialized, so we can't rely on its value.
*/
fotg210->command &= ~CMD_RUN;
temp = fotg210_readl(fotg210, &fotg210->regs->command);
temp &= ~(CMD_RUN | CMD_IAAD);
fotg210_writel(fotg210, temp, &fotg210->regs->command);
spin_unlock_irq(&fotg210->lock);
synchronize_irq(fotg210_to_hcd(fotg210)->irq);
return handshake(fotg210, &fotg210->regs->status,
STS_HALT, STS_HALT, 16 * 125);
}
/* Reset a non-running (STS_HALT == 1) controller.
* Must be called with interrupts enabled and the lock not held.
*/
static int fotg210_reset(struct fotg210_hcd *fotg210)
{
int retval;
u32 command = fotg210_readl(fotg210, &fotg210->regs->command);
/* If the EHCI debug controller is active, special care must be
* taken before and after a host controller reset
*/
if (fotg210->debug && !dbgp_reset_prep(fotg210_to_hcd(fotg210)))
fotg210->debug = NULL;
command |= CMD_RESET;
dbg_cmd(fotg210, "reset", command);
fotg210_writel(fotg210, command, &fotg210->regs->command);
fotg210->rh_state = FOTG210_RH_HALTED;
fotg210->next_statechange = jiffies;
retval = handshake(fotg210, &fotg210->regs->command,
CMD_RESET, 0, 250 * 1000);
if (retval)
return retval;
if (fotg210->debug)
dbgp_external_startup(fotg210_to_hcd(fotg210));
fotg210->port_c_suspend = fotg210->suspended_ports =
fotg210->resuming_ports = 0;
return retval;
}
/* Idle the controller (turn off the schedules).
* Must be called with interrupts enabled and the lock not held.
*/
static void fotg210_quiesce(struct fotg210_hcd *fotg210)
{
u32 temp;
if (fotg210->rh_state != FOTG210_RH_RUNNING)
return;
/* wait for any schedule enables/disables to take effect */
temp = (fotg210->command << 10) & (STS_ASS | STS_PSS);
handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, temp,
16 * 125);
/* then disable anything that's still active */
spin_lock_irq(&fotg210->lock);
fotg210->command &= ~(CMD_ASE | CMD_PSE);
fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
spin_unlock_irq(&fotg210->lock);
/* hardware can take 16 microframes to turn off ... */
handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, 0,
16 * 125);
}
static void end_unlink_async(struct fotg210_hcd *fotg210);
static void unlink_empty_async(struct fotg210_hcd *fotg210);
static void fotg210_work(struct fotg210_hcd *fotg210);
static void start_unlink_intr(struct fotg210_hcd *fotg210,
struct fotg210_qh *qh);
static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);
/* Set a bit in the USBCMD register */
static void fotg210_set_command_bit(struct fotg210_hcd *fotg210, u32 bit)
{
fotg210->command |= bit;
fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
/* unblock posted write */
fotg210_readl(fotg210, &fotg210->regs->command);