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authorAlek Du <alek.du@intel.com>2010-06-04 15:47:54 +0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-10 14:35:35 -0700
commitaa4d8342988d0c1a79ff19b2ede1e81dfbb16ea5 (patch)
tree7139abaa1f63af9a70405cec91dcd1b8a30bf0d0 /drivers/usb
parente644814a2ccbfe171d2fd2b9bca491ead1ae1a96 (diff)
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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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/ehci-dbg.c144
-rw-r--r--drivers/usb/host/ehci-hcd.c1
-rw-r--r--drivers/usb/host/ehci.h1
3 files changed, 139 insertions, 7 deletions
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index 874d2000bf9..df5546bb836 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -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;
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index a3ef2a9d9dc..20ca6a9ff21 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -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>
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 650a687f285..bfaac164636 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -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
};