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USB: EHCI: EHCI 1.1 addendum: preparation 

EHCI 1.1 addendum introduced several energy efficiency extensions for
EHCI USB host controllers:
1. LPM (link power management)
2. Per-port change
3. Shorter periodic frame list
4. Hardware prefetching

This patch is intended to define the HW bits and debug interface for
EHCI 1.1 addendum. The LPM and Per-port change patches will be sent out
after this patch.

Signed-off-by: Jacob Pan <jacob.jun.pan@intel.com>
Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alek Du 2010-06-04 15:47:54 +08:00 committed by Greg Kroah-Hartman
parent e644814a2c
commit aa4d834298
4 changed files with 162 additions and 7 deletions
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144
drivers/usb/host/ehci-dbg.c
View File

@ -98,13 +98,18 @@ static void dbg_hcc_params (struct ehci_hcd *ehci, char *label)
HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
} else {
ehci_dbg (ehci,
"%s hcc_params %04x thresh %d uframes %s%s%s\n",
"%s hcc_params %04x thresh %d uframes %s%s%s%s%s%s%s\n",
label,
params,
HCC_ISOC_THRES(params),
HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
HCC_CANPARK(params) ? " park" : "",
HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
HCC_64BIT_ADDR(params) ? " 64 bit addr" : "",
HCC_LPM(params) ? " LPM" : "",
HCC_PER_PORT_CHANGE_EVENT(params) ? " ppce" : "",
HCC_HW_PREFETCH(params) ? " hw prefetch" : "",
HCC_32FRAME_PERIODIC_LIST(params) ?
" 32 peridic list" : "");
}
}
#else
@ -191,8 +196,9 @@ 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",
"%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s%s",
label, label [0] ? " " : "", status,
(status & STS_PPCE_MASK) ? " PPCE" : "",
(status & STS_ASS) ? " Async" : "",
(status & STS_PSS) ? " Periodic" : "",
(status & STS_RECL) ? " Recl" : "",
@ -210,8 +216,9 @@ 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",
"%s%sintrenable %02x%s%s%s%s%s%s%s",
label, label [0] ? " " : "", enable,
(enable & STS_PPCE_MASK) ? " PPCE" : "",
(enable & STS_IAA) ? " IAA" : "",
(enable & STS_FATAL) ? " FATAL" : "",
(enable & STS_FLR) ? " FLR" : "",
@ -228,9 +235,15 @@ 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",
"%s%scommand %07x %s%s%s%s%s%s=%d ithresh=%d%s%s%s%s "
"period=%s%s %s",
label, label [0] ? " " : "", command,
(command & CMD_PARK) ? "park" : "(park)",
(command & CMD_HIRD) ? " HIRD" : "",
(command & CMD_PPCEE) ? " PPCEE" : "",
(command & CMD_FSP) ? " FSP" : "",
(command & CMD_ASPE) ? " ASPE" : "",
(command & CMD_PSPE) ? " PSPE" : "",
(command & CMD_PARK) ? " park" : "(park)",
CMD_PARK_CNT (command),
(command >> 16) & 0x3f,
(command & CMD_LRESET) ? " LReset" : "",
@ -257,11 +270,22 @@ dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
}
return scnprintf (buf, len,
"%s%sport %d status %06x%s%s sig=%s%s%s%s%s%s%s%s%s%s",
"%s%sport:%d status %06x %d %s%s%s%s%s%s "
"sig=%s%s%s%s%s%s%s%s%s%s%s",
label, label [0] ? " " : "", port, status,
status>>25,/*device address */
(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ACK ?
" ACK" : "",
(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_NYET ?
" NYET" : "",
(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_STALL ?
" STALL" : "",
(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ERR ?
" ERR" : "",
(status & PORT_POWER) ? " POWER" : "",
(status & PORT_OWNER) ? " OWNER" : "",
sig,
(status & PORT_LPM) ? " LPM" : "",
(status & PORT_RESET) ? " RESET" : "",
(status & PORT_SUSPEND) ? " SUSPEND" : "",
(status & PORT_RESUME) ? " RESUME" : "",
@ -330,6 +354,13 @@ 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 int debug_lpm_open(struct inode *, struct file *);
static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos);
static ssize_t debug_lpm_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos);
static int debug_lpm_close(struct inode *inode, struct file *file);
static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
static int debug_close(struct inode *, struct file *);
@ -351,6 +382,13 @@ static const struct file_operations debug_registers_fops = {
.read = debug_output,
.release = debug_close,
};
static const struct file_operations debug_lpm_fops = {
.owner = THIS_MODULE,
.open = debug_lpm_open,
.read = debug_lpm_read,
.write = debug_lpm_write,
.release = debug_lpm_close,
};
static struct dentry *ehci_debug_root;
@ -917,6 +955,94 @@ static int debug_registers_open(struct inode *inode, struct file *file)
return file->private_data ? 0 : -ENOMEM;
}
static int debug_lpm_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static int debug_lpm_close(struct inode *inode, struct file *file)
{
return 0;
}
static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
/* TODO: show lpm stats */
return 0;
}
static ssize_t debug_lpm_write(struct file *file, const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
char buf[50];
size_t len;
u32 temp;
unsigned long port;
u32 __iomem *portsc ;
u32 params;
hcd = bus_to_hcd(file->private_data);
ehci = hcd_to_ehci(hcd);
len = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, len))
return -EFAULT;
buf[len] = '\0';
if (len > 0 && buf[len - 1] == '\n')
buf[len - 1] = '\0';
if (strncmp(buf, "enable", 5) == 0) {
if (strict_strtoul(buf + 7, 10, &port))
return -EINVAL;
params = ehci_readl(ehci, &ehci->caps->hcs_params);
if (port > HCS_N_PORTS(params)) {
ehci_dbg(ehci, "ERR: LPM on bad port %lu\n", port);
return -ENODEV;
}
portsc = &ehci->regs->port_status[port-1];
temp = ehci_readl(ehci, portsc);
if (!(temp & PORT_DEV_ADDR)) {
ehci_dbg(ehci, "LPM: no device attached\n");
return -ENODEV;
}
temp |= PORT_LPM;
ehci_writel(ehci, temp, portsc);
printk(KERN_INFO "force enable LPM for port %lu\n", port);
} else if (strncmp(buf, "hird=", 5) == 0) {
unsigned long hird;
if (strict_strtoul(buf + 5, 16, &hird))
return -EINVAL;
printk(KERN_INFO "setting hird %s %lu\n", buf + 6, hird);
temp = ehci_readl(ehci, &ehci->regs->command);
temp &= ~CMD_HIRD;
temp |= hird << 24;
ehci_writel(ehci, temp, &ehci->regs->command);
} else if (strncmp(buf, "disable", 7) == 0) {
if (strict_strtoul(buf + 8, 10, &port))
return -EINVAL;
params = ehci_readl(ehci, &ehci->caps->hcs_params);
if (port > HCS_N_PORTS(params)) {
ehci_dbg(ehci, "ERR: LPM off bad port %lu\n", port);
return -ENODEV;
}
portsc = &ehci->regs->port_status[port-1];
temp = ehci_readl(ehci, portsc);
if (!(temp & PORT_DEV_ADDR)) {
ehci_dbg(ehci, "ERR: no device attached\n");
return -ENODEV;
}
temp &= ~PORT_LPM;
ehci_writel(ehci, temp, portsc);
printk(KERN_INFO "disabled LPM for port %lu\n", port);
} else
return -EOPNOTSUPP;
return count;
}
static inline void create_debug_files (struct ehci_hcd *ehci)
{
struct usb_bus *bus = &ehci_to_hcd(ehci)->self;
@ -940,6 +1066,10 @@ static inline void create_debug_files (struct ehci_hcd *ehci)
ehci->debug_registers = debugfs_create_file("registers", S_IRUGO,
ehci->debug_dir, bus,
&debug_registers_fops);
ehci->debug_registers = debugfs_create_file("lpm", S_IRUGO|S_IWUGO,
ehci->debug_dir, bus,
&debug_lpm_fops);
if (!ehci->debug_registers)
goto registers_error;
return;

1
drivers/usb/host/ehci-hcd.c
View File

@ -36,6 +36,7 @@
#include <linux/dma-mapping.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>
#include <asm/io.h>

1
drivers/usb/host/ehci.h
View File

@ -157,6 +157,7 @@ struct ehci_hcd { /* one per controller */
struct dentry *debug_async;
struct dentry *debug_periodic;
struct dentry *debug_registers;
struct dentry *debug_lpm;
#endif
};

23
include/linux/usb/ehci_def.h
View File

@ -39,6 +39,12 @@ struct ehci_caps {
#define HCS_N_PORTS(p) (((p)>>0)&0xf) /* bits 3:0, ports on HC */
u32 hcc_params; /* HCCPARAMS - offset 0x8 */
/* EHCI 1.1 addendum */
#define HCC_32FRAME_PERIODIC_LIST(p) ((p)&(1 << 19))
#define HCC_PER_PORT_CHANGE_EVENT(p) ((p)&(1 << 18))
#define HCC_LPM(p) ((p)&(1 << 17))
#define HCC_HW_PREFETCH(p) ((p)&(1 << 16))
#define HCC_EXT_CAPS(p) (((p)>>8)&0xff) /* for pci extended caps */
#define HCC_ISOC_CACHE(p) ((p)&(1 << 7)) /* true: can cache isoc frame */
#define HCC_ISOC_THRES(p) (((p)>>4)&0x7) /* bits 6:4, uframes cached */
@ -54,6 +60,13 @@ struct ehci_regs {
/* USBCMD: offset 0x00 */
u32 command;
/* EHCI 1.1 addendum */
#define CMD_HIRD (0xf<<24) /* host initiated resume duration */
#define CMD_PPCEE (1<<15) /* per port change event enable */
#define CMD_FSP (1<<14) /* fully synchronized prefetch */
#define CMD_ASPE (1<<13) /* async schedule prefetch enable */
#define CMD_PSPE (1<<12) /* periodic schedule prefetch enable */
/* 23:16 is r/w intr rate, in microframes; default "8" == 1/msec */
#define CMD_PARK (1<<11) /* enable "park" on async qh */
#define CMD_PARK_CNT(c) (((c)>>8)&3) /* how many transfers to park for */
@ -67,6 +80,7 @@ struct ehci_regs {
/* USBSTS: offset 0x04 */
u32 status;
#define STS_PPCE_MASK (0xff<<16) /* Per-Port change event 1-16 */
#define STS_ASS (1<<15) /* Async Schedule Status */
#define STS_PSS (1<<14) /* Periodic Schedule Status */
#define STS_RECL (1<<13) /* Reclamation */
@ -100,6 +114,14 @@ struct ehci_regs {
/* PORTSC: offset 0x44 */
u32 port_status[0]; /* up to N_PORTS */
/* EHCI 1.1 addendum */
#define PORTSC_SUSPEND_STS_ACK 0
#define PORTSC_SUSPEND_STS_NYET 1
#define PORTSC_SUSPEND_STS_STALL 2
#define PORTSC_SUSPEND_STS_ERR 3
#define PORT_DEV_ADDR (0x7f<<25) /* device address */
#define PORT_SSTS (0x3<<23) /* suspend status */
/* 31:23 reserved */
#define PORT_WKOC_E (1<<22) /* wake on overcurrent (enable) */
#define PORT_WKDISC_E (1<<21) /* wake on disconnect (enable) */
@ -115,6 +137,7 @@ struct ehci_regs {
#define PORT_USB11(x) (((x)&(3<<10)) == (1<<10)) /* USB 1.1 device */
/* 11:10 for detecting lowspeed devices (reset vs release ownership) */
/* 9 reserved */
#define PORT_LPM (1<<9) /* LPM transaction */
#define PORT_RESET (1<<8) /* reset port */
#define PORT_SUSPEND (1<<7) /* suspend port */
#define PORT_RESUME (1<<6) /* resume it */