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android-kvm / linux / 87156d692afdc4c689e99380a263445217a4b76c / . / drivers / usb / host / isp1760-hcd.c
blob: 9f01293600b0559e9d30ca6a11ae2244e102189b [file] [log] [blame]
/*
* Driver for the NXP ISP1760 chip
*
* However, the code might contain some bugs. What doesn't work for sure is:
* - ISO
* - OTG
e The interrupt line is configured as active low, level.
*
* (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/usb.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <asm/unaligned.h>
#include <asm/cacheflush.h>
#include "../core/hcd.h"
#include "isp1760-hcd.h"
static struct kmem_cache *qtd_cachep;
static struct kmem_cache *qh_cachep;
struct isp1760_hcd {
u32 hcs_params;
spinlock_t lock;
struct inter_packet_info atl_ints[32];
struct inter_packet_info int_ints[32];
struct memory_chunk memory_pool[BLOCKS];
/* periodic schedule support */
#define DEFAULT_I_TDPS 1024
unsigned periodic_size;
unsigned i_thresh;
unsigned long reset_done;
unsigned long next_statechange;
unsigned int devflags;
};
static inline struct isp1760_hcd *hcd_to_priv(struct usb_hcd *hcd)
{
return (struct isp1760_hcd *) (hcd->hcd_priv);
}
static inline struct usb_hcd *priv_to_hcd(struct isp1760_hcd *priv)
{
return container_of((void *) priv, struct usb_hcd, hcd_priv);
}
/* Section 2.2 Host Controller Capability Registers */
#define HC_LENGTH(p) (((p)>>00)&0x00ff) /* bits 7:0 */
#define HC_VERSION(p) (((p)>>16)&0xffff) /* bits 31:16 */
#define HCS_INDICATOR(p) ((p)&(1 << 16)) /* true: has port indicators */
#define HCS_PPC(p) ((p)&(1 << 4)) /* true: port power control */
#define HCS_N_PORTS(p) (((p)>>0)&0xf) /* bits 3:0, ports on HC */
#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 */
/* Section 2.3 Host Controller Operational Registers */
#define CMD_LRESET (1<<7) /* partial reset (no ports, etc) */
#define CMD_RESET (1<<1) /* reset HC not bus */
#define CMD_RUN (1<<0) /* start/stop HC */
#define STS_PCD (1<<2) /* port change detect */
#define FLAG_CF (1<<0) /* true: we'll support "high speed" */
#define PORT_OWNER (1<<13) /* true: companion hc owns this port */
#define PORT_POWER (1<<12) /* true: has power (see PPC) */
#define PORT_USB11(x) (((x) & (3 << 10)) == (1 << 10)) /* USB 1.1 device */
#define PORT_RESET (1<<8) /* reset port */
#define PORT_SUSPEND (1<<7) /* suspend port */
#define PORT_RESUME (1<<6) /* resume it */
#define PORT_PE (1<<2) /* port enable */
#define PORT_CSC (1<<1) /* connect status change */
#define PORT_CONNECT (1<<0) /* device connected */
#define PORT_RWC_BITS (PORT_CSC)
struct isp1760_qtd {
struct isp1760_qtd *hw_next;
u8 packet_type;
u8 toggle;
void *data_buffer;
/* the rest is HCD-private */
struct list_head qtd_list;
struct urb *urb;
size_t length;
/* isp special*/
u32 status;
#define URB_COMPLETE_NOTIFY (1 << 0)
#define URB_ENQUEUED (1 << 1)
#define URB_TYPE_ATL (1 << 2)
#define URB_TYPE_INT (1 << 3)
};
struct isp1760_qh {
/* first part defined by EHCI spec */
struct list_head qtd_list;
struct isp1760_hcd *priv;
/* periodic schedule info */
unsigned short period; /* polling interval */
struct usb_device *dev;
u32 toggle;
u32 ping;
};
#define ehci_port_speed(priv, portsc) (1 << USB_PORT_FEAT_HIGHSPEED)
static unsigned int isp1760_readl(__u32 __iomem *regs)
{
return readl(regs);
}
static void isp1760_writel(const unsigned int val, __u32 __iomem *regs)
{
writel(val, regs);
}
/*
* The next two copy via MMIO data to/from the device. memcpy_{to|from}io()
* doesn't quite work because some people have to enforce 32-bit access
*/
static void priv_read_copy(struct isp1760_hcd *priv, u32 *src,
__u32 __iomem *dst, u32 len)
{
u32 val;
u8 *buff8;
if (!src) {
printk(KERN_ERR "ERROR: buffer: %p len: %d\n", src, len);
return;
}
while (len >= 4) {
*src = __raw_readl(dst);
len -= 4;
src++;
dst++;
}
if (!len)
return;
/* in case we have 3, 2 or 1 by left. The dst buffer may not be fully
* allocated.
*/
val = isp1760_readl(dst);
buff8 = (u8 *)src;
while (len) {
*buff8 = val;
val >>= 8;
len--;
buff8++;
}
}
static void priv_write_copy(const struct isp1760_hcd *priv, const u32 *src,
__u32 __iomem *dst, u32 len)
{
while (len >= 4) {
__raw_writel(*src, dst);
len -= 4;
src++;
dst++;
}
if (!len)
return;
/* in case we have 3, 2 or 1 by left. The buffer is allocated and the
* extra bytes should not be read by the HW
*/
__raw_writel(*src, dst);
}
/* memory management of the 60kb on the chip from 0x1000 to 0xffff */
static void init_memory(struct isp1760_hcd *priv)
{
int i;
u32 payload;
payload = 0x1000;
for (i = 0; i < BLOCK_1_NUM; i++) {
priv->memory_pool[i].start = payload;
priv->memory_pool[i].size = BLOCK_1_SIZE;
priv->memory_pool[i].free = 1;
payload += priv->memory_pool[i].size;
}
for (i = BLOCK_1_NUM; i < BLOCK_1_NUM + BLOCK_2_NUM; i++) {
priv->memory_pool[i].start = payload;
priv->memory_pool[i].size = BLOCK_2_SIZE;
priv->memory_pool[i].free = 1;
payload += priv->memory_pool[i].size;
}
for (i = BLOCK_1_NUM + BLOCK_2_NUM; i < BLOCKS; i++) {
priv->memory_pool[i].start = payload;
priv->memory_pool[i].size = BLOCK_3_SIZE;
priv->memory_pool[i].free = 1;
payload += priv->memory_pool[i].size;
}
BUG_ON(payload - priv->memory_pool[i - 1].size > PAYLOAD_SIZE);
}
static u32 alloc_mem(struct isp1760_hcd *priv, u32 size)
{
int i;
if (!size)
return ISP1760_NULL_POINTER;
for (i = 0; i < BLOCKS; i++) {
if (priv->memory_pool[i].size >= size &&
priv->memory_pool[i].free) {
priv->memory_pool[i].free = 0;
return priv->memory_pool[i].start;
}
}
printk(KERN_ERR "ISP1760 MEM: can not allocate %d bytes of memory\n",
size);
printk(KERN_ERR "Current memory map:\n");
for (i = 0; i < BLOCKS; i++) {
printk(KERN_ERR "Pool %2d size %4d status: %d\n",
i, priv->memory_pool[i].size,
priv->memory_pool[i].free);
}
/* XXX maybe -ENOMEM could be possible */
BUG();
return 0;
}
static void free_mem(struct isp1760_hcd *priv, u32 mem)
{
int i;
if (mem == ISP1760_NULL_POINTER)
return;
for (i = 0; i < BLOCKS; i++) {
if (priv->memory_pool[i].start == mem) {
BUG_ON(priv->memory_pool[i].free);
priv->memory_pool[i].free = 1;
return ;
}
}
printk(KERN_ERR "Trying to free not-here-allocated memory :%08x\n",
mem);
BUG();
}
static void isp1760_init_regs(struct usb_hcd *hcd)
{
isp1760_writel(0, hcd->regs + HC_BUFFER_STATUS_REG);
isp1760_writel(NO_TRANSFER_ACTIVE, hcd->regs +
HC_ATL_PTD_SKIPMAP_REG);
isp1760_writel(NO_TRANSFER_ACTIVE, hcd->regs +
HC_INT_PTD_SKIPMAP_REG);
isp1760_writel(NO_TRANSFER_ACTIVE, hcd->regs +
HC_ISO_PTD_SKIPMAP_REG);
isp1760_writel(~NO_TRANSFER_ACTIVE, hcd->regs +
HC_ATL_PTD_DONEMAP_REG);
isp1760_writel(~NO_TRANSFER_ACTIVE, hcd->regs +
HC_INT_PTD_DONEMAP_REG);
isp1760_writel(~NO_TRANSFER_ACTIVE, hcd->regs +
HC_ISO_PTD_DONEMAP_REG);
}
static int handshake(struct isp1760_hcd *priv, void __iomem *ptr,
u32 mask, u32 done, int usec)
{
u32 result;
do {
result = isp1760_readl(ptr);
if (result == ~0)
return -ENODEV;
result &= mask;
if (result == done)
return 0;
udelay(1);
usec--;
} while (usec > 0);
return -ETIMEDOUT;
}
/* reset a non-running (STS_HALT == 1) controller */
static int ehci_reset(struct isp1760_hcd *priv)
{
int retval;
struct usb_hcd *hcd = priv_to_hcd(priv);
u32 command = isp1760_readl(hcd->regs + HC_USBCMD);
command |= CMD_RESET;
isp1760_writel(command, hcd->regs + HC_USBCMD);
hcd->state = HC_STATE_HALT;
priv->next_statechange = jiffies;
retval = handshake(priv, hcd->regs + HC_USBCMD,
CMD_RESET, 0, 250 * 1000);
return retval;
}
static void qh_destroy(struct isp1760_qh *qh)
{
BUG_ON(!list_empty(&qh->qtd_list));
kmem_cache_free(qh_cachep, qh);
}
static struct isp1760_qh *isp1760_qh_alloc(struct isp1760_hcd *priv,
gfp_t flags)
{
struct isp1760_qh *qh;
qh = kmem_cache_zalloc(qh_cachep, flags);
if (!qh)
return qh;
INIT_LIST_HEAD(&qh->qtd_list);
qh->priv = priv;
return qh;
}
/* magic numbers that can affect system performance */
#define EHCI_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
#define EHCI_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
#define EHCI_TUNE_RL_TT 0
#define EHCI_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
#define EHCI_TUNE_MULT_TT 1
#define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */
/* one-time init, only for memory state */
static int priv_init(struct usb_hcd *hcd)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
u32 hcc_params;
spin_lock_init(&priv->lock);
/*
* hw default: 1K periodic list heads, one per frame.
* periodic_size can shrink by USBCMD update if hcc_params allows.
*/
priv->periodic_size = DEFAULT_I_TDPS;
/* controllers may cache some of the periodic schedule ... */
hcc_params = isp1760_readl(hcd->regs + HC_HCCPARAMS);
/* full frame cache */
if (HCC_ISOC_CACHE(hcc_params))
priv->i_thresh = 8;
else /* N microframes cached */
priv->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
return 0;
}
static int isp1760_hc_setup(struct usb_hcd *hcd)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
int result;
u32 scratch, hwmode;
/* Setup HW Mode Control: This assumes a level active-low interrupt */
hwmode = HW_DATA_BUS_32BIT;
if (priv->devflags & ISP1760_FLAG_BUS_WIDTH_16)
hwmode &= ~HW_DATA_BUS_32BIT;
if (priv->devflags & ISP1760_FLAG_ANALOG_OC)
hwmode |= HW_ANA_DIGI_OC;
if (priv->devflags & ISP1760_FLAG_DACK_POL_HIGH)
hwmode |= HW_DACK_POL_HIGH;
if (priv->devflags & ISP1760_FLAG_DREQ_POL_HIGH)
hwmode |= HW_DREQ_POL_HIGH;
if (priv->devflags & ISP1760_FLAG_INTR_POL_HIGH)
hwmode |= HW_INTR_HIGH_ACT;
if (priv->devflags & ISP1760_FLAG_INTR_EDGE_TRIG)
hwmode |= HW_INTR_EDGE_TRIG;
/*
* We have to set this first in case we're in 16-bit mode.
* Write it twice to ensure correct upper bits if switching
* to 16-bit mode.
*/
isp1760_writel(hwmode, hcd->regs + HC_HW_MODE_CTRL);
isp1760_writel(hwmode, hcd->regs + HC_HW_MODE_CTRL);
isp1760_writel(0xdeadbabe, hcd->regs + HC_SCRATCH_REG);
/* Change bus pattern */
scratch = isp1760_readl(hcd->regs + HC_CHIP_ID_REG);
scratch = isp1760_readl(hcd->regs + HC_SCRATCH_REG);
if (scratch != 0xdeadbabe) {
printk(KERN_ERR "ISP1760: Scratch test failed.\n");
return -ENODEV;
}
/* pre reset */
isp1760_init_regs(hcd);
/* reset */
isp1760_writel(SW_RESET_RESET_ALL, hcd->regs + HC_RESET_REG);
mdelay(100);
isp1760_writel(SW_RESET_RESET_HC, hcd->regs + HC_RESET_REG);
mdelay(100);
result = ehci_reset(priv);
if (result)
return result;
/* Step 11 passed */
isp1760_info(priv, "bus width: %d, oc: %s\n",
(priv->devflags & ISP1760_FLAG_BUS_WIDTH_16) ?
16 : 32, (priv->devflags & ISP1760_FLAG_ANALOG_OC) ?
"analog" : "digital");
/* ATL reset */
isp1760_writel(hwmode | ALL_ATX_RESET, hcd->regs + HC_HW_MODE_CTRL);
mdelay(10);
isp1760_writel(hwmode, hcd->regs + HC_HW_MODE_CTRL);
isp1760_writel(INTERRUPT_ENABLE_MASK, hcd->regs + HC_INTERRUPT_REG);
isp1760_writel(INTERRUPT_ENABLE_MASK, hcd->regs + HC_INTERRUPT_ENABLE);
/*
* PORT 1 Control register of the ISP1760 is the OTG control
* register on ISP1761. Since there is no OTG or device controller
* support in this driver, we use port 1 as a "normal" USB host port on
* both chips.
*/
isp1760_writel(PORT1_POWER | PORT1_INIT2,
hcd->regs + HC_PORT1_CTRL);
mdelay(10);
priv->hcs_params = isp1760_readl(hcd->regs + HC_HCSPARAMS);
return priv_init(hcd);
}
static void isp1760_init_maps(struct usb_hcd *hcd)
{
/*set last maps, for iso its only 1, else 32 tds bitmap*/
isp1760_writel(0x80000000, hcd->regs + HC_ATL_PTD_LASTPTD_REG);
isp1760_writel(0x80000000, hcd->regs + HC_INT_PTD_LASTPTD_REG);
isp1760_writel(0x00000001, hcd->regs + HC_ISO_PTD_LASTPTD_REG);
}
static void isp1760_enable_interrupts(struct usb_hcd *hcd)
{
isp1760_writel(0, hcd->regs + HC_ATL_IRQ_MASK_AND_REG);
isp1760_writel(0, hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
isp1760_writel(0, hcd->regs + HC_INT_IRQ_MASK_AND_REG);
isp1760_writel(0, hcd->regs + HC_INT_IRQ_MASK_OR_REG);
isp1760_writel(0, hcd->regs + HC_ISO_IRQ_MASK_AND_REG);
isp1760_writel(0xffffffff, hcd->regs + HC_ISO_IRQ_MASK_OR_REG);
/* step 23 passed */
}
static int isp1760_run(struct usb_hcd *hcd)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
int retval;
u32 temp;
u32 command;
u32 chipid;
hcd->uses_new_polling = 1;
hcd->poll_rh = 0;
hcd->state = HC_STATE_RUNNING;
isp1760_enable_interrupts(hcd);
temp = isp1760_readl(hcd->regs + HC_HW_MODE_CTRL);
isp1760_writel(temp | HW_GLOBAL_INTR_EN, hcd->regs + HC_HW_MODE_CTRL);
command = isp1760_readl(hcd->regs + HC_USBCMD);
command &= ~(CMD_LRESET|CMD_RESET);
command |= CMD_RUN;
isp1760_writel(command, hcd->regs + HC_USBCMD);
retval = handshake(priv, hcd->regs + HC_USBCMD, CMD_RUN, CMD_RUN,
250 * 1000);
if (retval)
return retval;
/*
* XXX
* Spec says to write FLAG_CF as last config action, priv code grabs
* the semaphore while doing so.
*/
down_write(&ehci_cf_port_reset_rwsem);
isp1760_writel(FLAG_CF, hcd->regs + HC_CONFIGFLAG);
retval = handshake(priv, hcd->regs + HC_CONFIGFLAG, FLAG_CF, FLAG_CF,
250 * 1000);
up_write(&ehci_cf_port_reset_rwsem);
if (retval)
return retval;
chipid = isp1760_readl(hcd->regs + HC_CHIP_ID_REG);
isp1760_info(priv, "USB ISP %04x HW rev. %d started\n", chipid & 0xffff,
chipid >> 16);
/* PTD Register Init Part 2, Step 28 */
/* enable INTs */
isp1760_init_maps(hcd);
/* GRR this is run-once init(), being done every time the HC starts.
* So long as they're part of class devices, we can't do it init()
* since the class device isn't created that early.
*/
return 0;
}
static u32 base_to_chip(u32 base)
{
return ((base - 0x400) >> 3);
}
static void transform_into_atl(struct isp1760_hcd *priv, struct isp1760_qh *qh,
struct isp1760_qtd *qtd, struct urb *urb,
u32 payload, struct ptd *ptd)
{
u32 dw0;
u32 dw1;
u32 dw2;
u32 dw3;
u32 maxpacket;
u32 multi;
u32 pid_code;
u32 rl = RL_COUNTER;
u32 nak = NAK_COUNTER;
/* according to 3.6.2, max packet len can not be > 0x400 */
maxpacket = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
multi = 1 + ((maxpacket >> 11) & 0x3);
maxpacket &= 0x7ff;
/* DW0 */
dw0 = PTD_VALID;
dw0 |= PTD_LENGTH(qtd->length);
dw0 |= PTD_MAXPACKET(maxpacket);
dw0 |= PTD_ENDPOINT(usb_pipeendpoint(urb->pipe));
dw1 = usb_pipeendpoint(urb->pipe) >> 1;
/* DW1 */
dw1 |= PTD_DEVICE_ADDR(usb_pipedevice(urb->pipe));
pid_code = qtd->packet_type;
dw1 |= PTD_PID_TOKEN(pid_code);
if (usb_pipebulk(urb->pipe))
dw1 |= PTD_TRANS_BULK;
else if (usb_pipeint(urb->pipe))
dw1 |= PTD_TRANS_INT;
if (urb->dev->speed != USB_SPEED_HIGH) {
/* split transaction */
dw1 |= PTD_TRANS_SPLIT;
if (urb->dev->speed == USB_SPEED_LOW)
dw1 |= PTD_SE_USB_LOSPEED;
dw1 |= PTD_PORT_NUM(urb->dev->ttport);
dw1 |= PTD_HUB_NUM(urb->dev->tt->hub->devnum);
/* SE bit for Split INT transfers */
if (usb_pipeint(urb->pipe) &&
(urb->dev->speed == USB_SPEED_LOW))
dw1 |= 2 << 16;
dw3 = 0;
rl = 0;
nak = 0;
} else {
dw0 |= PTD_MULTI(multi);
if (usb_pipecontrol(urb->pipe) || usb_pipebulk(urb->pipe))
dw3 = qh->ping;
else
dw3 = 0;
}
/* DW2 */
dw2 = 0;
dw2 |= PTD_DATA_START_ADDR(base_to_chip(payload));
dw2 |= PTD_RL_CNT(rl);
dw3 |= PTD_NAC_CNT(nak);
/* DW3 */
if (usb_pipecontrol(urb->pipe))
dw3 |= PTD_DATA_TOGGLE(qtd->toggle);
else
dw3 |= qh->toggle;
dw3 |= PTD_ACTIVE;
/* Cerr */
dw3 |= PTD_CERR(ERR_COUNTER);
memset(ptd, 0, sizeof(*ptd));
ptd->dw0 = cpu_to_le32(dw0);
ptd->dw1 = cpu_to_le32(dw1);
ptd->dw2 = cpu_to_le32(dw2);
ptd->dw3 = cpu_to_le32(dw3);
}
static void transform_add_int(struct isp1760_hcd *priv, struct isp1760_qh *qh,
struct isp1760_qtd *qtd, struct urb *urb,
u32 payload, struct ptd *ptd)
{
u32 maxpacket;
u32 multi;
u32 numberofusofs;
u32 i;
u32 usofmask, usof;
u32 period;
maxpacket = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
multi = 1 + ((maxpacket >> 11) & 0x3);
maxpacket &= 0x7ff;
/* length of the data per uframe */
maxpacket = multi * maxpacket;
numberofusofs = urb->transfer_buffer_length / maxpacket;
if (urb->transfer_buffer_length % maxpacket)
numberofusofs += 1;
usofmask = 1;
usof = 0;
for (i = 0; i < numberofusofs; i++) {
usof |= usofmask;
usofmask <<= 1;
}
if (urb->dev->speed != USB_SPEED_HIGH) {
/* split */
ptd->dw5 = cpu_to_le32(0x1c);
if (qh->period >= 32)
period = qh->period / 2;
else
period = qh->period;
} else {
if (qh->period >= 8)
period = qh->period/8;
else
period = qh->period;
if (period >= 32)
period = 16;
if (qh->period >= 8) {
/* millisecond period */
period = (period << 3);
} else {
/* usof based tranmsfers */
/* minimum 4 usofs */
usof = 0x11;
}
}
ptd->dw2 |= cpu_to_le32(period);
ptd->dw4 = cpu_to_le32(usof);
}
static void transform_into_int(struct isp1760_hcd *priv, struct isp1760_qh *qh,
struct isp1760_qtd *qtd, struct urb *urb,
u32 payload, struct ptd *ptd)
{
transform_into_atl(priv, qh, qtd, urb, payload, ptd);
transform_add_int(priv, qh, qtd, urb, payload, ptd);
}
static int qtd_fill(struct isp1760_qtd *qtd, void *databuffer, size_t len,
u32 token)
{
int count;
qtd->data_buffer = databuffer;
qtd->packet_type = GET_QTD_TOKEN_TYPE(token);
qtd->toggle = GET_DATA_TOGGLE(token);
if (len > HC_ATL_PL_SIZE)
count = HC_ATL_PL_SIZE;
else
count = len;
qtd->length = count;
return count;
}
static int check_error(struct ptd *ptd)
{
int error = 0;
u32 dw3;
dw3 = le32_to_cpu(ptd->dw3);
if (dw3 & DW3_HALT_BIT)
error = -EPIPE;
if (dw3 & DW3_ERROR_BIT) {
printk(KERN_ERR "error bit is set in DW3\n");
error = -EPIPE;
}
if (dw3 & DW3_QTD_ACTIVE) {
printk(KERN_ERR "transfer active bit is set DW3\n");
printk(KERN_ERR "nak counter: %d, rl: %d\n", (dw3 >> 19) & 0xf,
(le32_to_cpu(ptd->dw2) >> 25) & 0xf);
}
return error;
}
static void check_int_err_status(u32 dw4)
{
u32 i;
dw4 >>= 8;
for (i = 0; i < 8; i++) {
switch (dw4 & 0x7) {
case INT_UNDERRUN:
printk(KERN_ERR "ERROR: under run , %d\n", i);
break;
case INT_EXACT:
printk(KERN_ERR "ERROR: transaction error, %d\n", i);
break;
case INT_BABBLE:
printk(KERN_ERR "ERROR: babble error, %d\n", i);
break;
}
dw4 >>= 3;
}
}
static void enqueue_one_qtd(struct isp1760_qtd *qtd, struct isp1760_hcd *priv,
u32 payload)
{
u32 token;
struct usb_hcd *hcd = priv_to_hcd(priv);
token = qtd->packet_type;
if (qtd->length && (qtd->length <= HC_ATL_PL_SIZE)) {
switch (token) {
case IN_PID:
break;
case OUT_PID:
case SETUP_PID:
priv_write_copy(priv, qtd->data_buffer,
hcd->regs + payload,
qtd->length);
}
}
}
static void enqueue_one_atl_qtd(u32 atl_regs, u32 payload,
struct isp1760_hcd *priv, struct isp1760_qh *qh,
struct urb *urb, u32 slot, struct isp1760_qtd *qtd)
{
struct ptd ptd;
struct usb_hcd *hcd = priv_to_hcd(priv);
transform_into_atl(priv, qh, qtd, urb, payload, &ptd);
priv_write_copy(priv, (u32 *)&ptd, hcd->regs + atl_regs, sizeof(ptd));
enqueue_one_qtd(qtd, priv, payload);
priv->atl_ints[slot].urb = urb;
priv->atl_ints[slot].qh = qh;
priv->atl_ints[slot].qtd = qtd;
priv->atl_ints[slot].data_buffer = qtd->data_buffer;
priv->atl_ints[slot].payload = payload;
qtd->status |= URB_ENQUEUED | URB_TYPE_ATL;
qtd->status |= slot << 16;
}
static void enqueue_one_int_qtd(u32 int_regs, u32 payload,
struct isp1760_hcd *priv, struct isp1760_qh *qh,
struct urb *urb, u32 slot, struct isp1760_qtd *qtd)
{
struct ptd ptd;
struct usb_hcd *hcd = priv_to_hcd(priv);
transform_into_int(priv, qh, qtd, urb, payload, &ptd);
priv_write_copy(priv, (u32 *)&ptd, hcd->regs + int_regs, sizeof(ptd));
enqueue_one_qtd(qtd, priv, payload);
priv->int_ints[slot].urb = urb;
priv->int_ints[slot].qh = qh;
priv->int_ints[slot].qtd = qtd;
priv->int_ints[slot].data_buffer = qtd->data_buffer;
priv->int_ints[slot].payload = payload;
qtd->status |= URB_ENQUEUED | URB_TYPE_INT;
qtd->status |= slot << 16;
}
static void enqueue_an_ATL_packet(struct usb_hcd *hcd, struct isp1760_qh *qh,
struct isp1760_qtd *qtd)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
u32 skip_map, or_map;
u32 queue_entry;
u32 slot;
u32 atl_regs, payload;
u32 buffstatus;
/*
* When this function is called from the interrupt handler to enqueue
* a follow-up packet, the SKIP register gets written and read back
* almost immediately. With ISP1761, this register requires a delay of
* 195ns between a write and subsequent read (see section 15.1.1.3).
*/
ndelay(195);
skip_map = isp1760_readl(hcd->regs + HC_ATL_PTD_SKIPMAP_REG);
BUG_ON(!skip_map);
slot = __ffs(skip_map);
queue_entry = 1 << slot;
atl_regs = ATL_REGS_OFFSET + slot * sizeof(struct ptd);
payload = alloc_mem(priv, qtd->length);
enqueue_one_atl_qtd(atl_regs, payload, priv, qh, qtd->urb, slot, qtd);
or_map = isp1760_readl(hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
or_map |= queue_entry;
isp1760_writel(or_map, hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
skip_map &= ~queue_entry;
isp1760_writel(skip_map, hcd->regs + HC_ATL_PTD_SKIPMAP_REG);
buffstatus = isp1760_readl(hcd->regs + HC_BUFFER_STATUS_REG);
buffstatus |= ATL_BUFFER;
isp1760_writel(buffstatus, hcd->regs + HC_BUFFER_STATUS_REG);
}
static void enqueue_an_INT_packet(struct usb_hcd *hcd, struct isp1760_qh *qh,
struct isp1760_qtd *qtd)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
u32 skip_map, or_map;
u32 queue_entry;
u32 slot;
u32 int_regs, payload;
u32 buffstatus;
/*
* When this function is called from the interrupt handler to enqueue
* a follow-up packet, the SKIP register gets written and read back
* almost immediately. With ISP1761, this register requires a delay of
* 195ns between a write and subsequent read (see section 15.1.1.3).
*/
ndelay(195);
skip_map = isp1760_readl(hcd->regs + HC_INT_PTD_SKIPMAP_REG);
BUG_ON(!skip_map);
slot = __ffs(skip_map);
queue_entry = 1 << slot;
int_regs = INT_REGS_OFFSET + slot * sizeof(struct ptd);
payload = alloc_mem(priv, qtd->length);
enqueue_one_int_qtd(int_regs, payload, priv, qh, qtd->urb, slot, qtd);
or_map = isp1760_readl(hcd->regs + HC_INT_IRQ_MASK_OR_REG);
or_map |= queue_entry;
isp1760_writel(or_map, hcd->regs + HC_INT_IRQ_MASK_OR_REG);
skip_map &= ~queue_entry;
isp1760_writel(skip_map, hcd->regs + HC_INT_PTD_SKIPMAP_REG);
buffstatus = isp1760_readl(hcd->regs + HC_BUFFER_STATUS_REG);
buffstatus |= INT_BUFFER;
isp1760_writel(buffstatus, hcd->regs + HC_BUFFER_STATUS_REG);
}
static void isp1760_urb_done(struct isp1760_hcd *priv, struct urb *urb, int status)
__releases(priv->lock)
__acquires(priv->lock)
{
if (!urb->unlinked) {
if (status == -EINPROGRESS)
status = 0;
}
if (usb_pipein(urb->pipe) && usb_pipetype(urb->pipe) != PIPE_CONTROL) {
void *ptr;
for (ptr = urb->transfer_buffer;
ptr < urb->transfer_buffer + urb->transfer_buffer_length;
ptr += PAGE_SIZE)
flush_dcache_page(virt_to_page(ptr));
}
/* complete() can reenter this HCD */
usb_hcd_unlink_urb_from_ep(priv_to_hcd(priv), urb);
spin_unlock(&priv->lock);
usb_hcd_giveback_urb(priv_to_hcd(priv), urb, status);
spin_lock(&priv->lock);
}
static void isp1760_qtd_free(struct isp1760_qtd *qtd)
{
kmem_cache_free(qtd_cachep, qtd);
}
static struct isp1760_qtd *clean_this_qtd(struct isp1760_qtd *qtd)
{
struct isp1760_qtd *tmp_qtd;
tmp_qtd = qtd->hw_next;
list_del(&qtd->qtd_list);
isp1760_qtd_free(qtd);
return tmp_qtd;
}
/*
* Remove this QTD from the QH list and free its memory. If this QTD
* isn't the last one than remove also his successor(s).
* Returns the QTD which is part of an new URB and should be enqueued.
*/
static struct isp1760_qtd *clean_up_qtdlist(struct isp1760_qtd *qtd)
{
struct isp1760_qtd *tmp_qtd;
int last_one;
do {
tmp_qtd = qtd->hw_next;
last_one = qtd->status & URB_COMPLETE_NOTIFY;
list_del(&qtd->qtd_list);
isp1760_qtd_free(qtd);
qtd = tmp_qtd;
} while (!last_one && qtd);
return qtd;
}
static void do_atl_int(struct usb_hcd *usb_hcd)
{
struct isp1760_hcd *priv = hcd_to_priv(usb_hcd);
u32 done_map, skip_map;
struct ptd ptd;
struct urb *urb = NULL;
u32 atl_regs_base;
u32 atl_regs;
u32 queue_entry;
u32 payload;
u32 length;
u32 or_map;
u32 status = -EINVAL;
int error;
struct isp1760_qtd *qtd;
struct isp1760_qh *qh;
u32 rl;
u32 nakcount;
done_map = isp1760_readl(usb_hcd->regs +
HC_ATL_PTD_DONEMAP_REG);
skip_map = isp1760_readl(usb_hcd->regs +
HC_ATL_PTD_SKIPMAP_REG);
or_map = isp1760_readl(usb_hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
or_map &= ~done_map;
isp1760_writel(or_map, usb_hcd->regs + HC_ATL_IRQ_MASK_OR_REG);
atl_regs_base = ATL_REGS_OFFSET;
while (done_map) {
u32 dw1;
u32 dw2;
u32 dw3;
status = 0;
queue_entry = __ffs(done_map);
done_map &= ~(1 << queue_entry);
skip_map |= 1 << queue_entry;
atl_regs = atl_regs_base + queue_entry * sizeof(struct ptd);
urb = priv->atl_ints[queue_entry].urb;
qtd = priv->atl_ints[queue_entry].qtd;
qh = priv->atl_ints[queue_entry].qh;
payload = priv->atl_ints[queue_entry].payload;
if (!qh) {
printk(KERN_ERR "qh is 0\n");
continue;
}
isp1760_writel(atl_regs + ISP_BANK(0), usb_hcd->regs +
HC_MEMORY_REG);
isp1760_writel(payload + ISP_BANK(1), usb_hcd->regs +
HC_MEMORY_REG);
/*
* write bank1 address twice to ensure the 90ns delay (time
* between BANK0 write and the priv_read_copy() call is at
* least 3*t_WHWL + 2*t_w11 = 3*25ns + 2*17ns = 109ns)
*/
isp1760_writel(payload + ISP_BANK(1), usb_hcd->regs +
HC_MEMORY_REG);
priv_read_copy(priv, (u32 *)&ptd, usb_hcd->regs + atl_regs +
ISP_BANK(0), sizeof(ptd));
dw1 = le32_to_cpu(ptd.dw1);
dw2 = le32_to_cpu(ptd.dw2);
dw3 = le32_to_cpu(ptd.dw3);
rl = (dw2 >> 25) & 0x0f;
nakcount = (dw3 >> 19) & 0xf;
/* Transfer Error, *but* active and no HALT -> reload */
if ((dw3 & DW3_ERROR_BIT) && (dw3 & DW3_QTD_ACTIVE) &&
!(dw3 & DW3_HALT_BIT)) {
/* according to ppriv code, we have to
* reload this one if trasfered bytes != requested bytes
* else act like everything went smooth..
* XXX This just doesn't feel right and hasn't
* triggered so far.
*/
length = PTD_XFERRED_LENGTH(dw3);
printk(KERN_ERR "Should reload now.... transfered %d "
"of %zu\n", length, qtd->length);
BUG();
}
if (!nakcount && (dw3 & DW3_QTD_ACTIVE)) {
u32 buffstatus;
/*
* NAKs are handled in HW by the chip. Usually if the
* device is not able to send data fast enough.
* This happens mostly on slower hardware.
*/
printk(KERN_NOTICE "Reloading ptd %p/%p... qh %p read: "
"%d of %zu done: %08x cur: %08x\n", qtd,
urb, qh, PTD_XFERRED_LENGTH(dw3),
qtd->length, done_map,
(1 << queue_entry));
/* RL counter = ERR counter */
dw3 &= ~(0xf << 19);
dw3 |= rl << 19;
dw3 &= ~(3 << (55 - 32));
dw3 |= ERR_COUNTER << (55 - 32);
/*
* It is not needed to write skip map back because it
* is unchanged. Just make sure that this entry is
* unskipped once it gets written to the HW.
*/
skip_map &= ~(1 << queue_entry);
or_map = isp1760_readl(usb_hcd->regs +
HC_ATL_IRQ_MASK_OR_REG);
or_map |= 1 << queue_entry;
isp1760_writel(or_map, usb_hcd->regs +
HC_ATL_IRQ_MASK_OR_REG);
ptd.dw3 = cpu_to_le32(dw3);
priv_write_copy(priv, (u32 *)&ptd, usb_hcd->regs +
atl_regs, sizeof(ptd));
ptd.dw0 |= cpu_to_le32(PTD_VALID);
priv_write_copy(priv, (u32 *)&ptd, usb_hcd->regs +
atl_regs, sizeof(ptd));
buffstatus = isp1760_readl(usb_hcd->regs +
HC_BUFFER_STATUS_REG);
buffstatus |= ATL_BUFFER;
isp1760_writel(buffstatus, usb_hcd->regs +
HC_BUFFER_STATUS_REG);
continue;
}
error = check_error(&ptd);
if (error) {
status = error;
priv->atl_ints[queue_entry].qh->toggle = 0;
priv->atl_ints[queue_entry].qh->ping = 0;
urb->status = -EPIPE;
#if 0
printk(KERN_ERR "Error in %s().\n", __func__);
printk(KERN_ERR "IN dw0: %08x dw1: %08x dw2: %08x "
"dw3: %08x dw4: %08x dw5: %08x dw6: "
"%08x dw7: %08x\n",
ptd.dw0, ptd.dw1, ptd.dw2, ptd.dw3,
ptd.dw4, ptd.dw5, ptd.dw6, ptd.dw7);
#endif
} else {
if (usb_pipetype(urb->pipe) == PIPE_BULK) {
priv->atl_ints[queue_entry].qh->toggle = dw3 &
(1 << 25);
priv->atl_ints[queue_entry].qh->ping = dw3 &
(1 << 26);
}
}
length = PTD_XFERRED_LENGTH(dw3);
if (length) {
switch (DW1_GET_PID(dw1)) {
case IN_PID:
priv_read_copy(priv,
priv->atl_ints[queue_entry].data_buffer,
usb_hcd->regs + payload + ISP_BANK(1),
length);
case OUT_PID:
urb->actual_length += length;
case SETUP_PID:
break;
}
}
priv->atl_ints[queue_entry].data_buffer = NULL;
priv->atl_ints[queue_entry].urb = NULL;
priv->atl_ints[queue_entry].qtd = NULL;
priv->atl_ints[queue_entry].qh = NULL;
free_mem(priv, payload);
isp1760_writel(skip_map, usb_hcd->regs +
HC_ATL_PTD_SKIPMAP_REG);
if (urb->status == -EPIPE) {
/* HALT was received */
qtd = clean_up_qtdlist(qtd);
isp1760_urb_done(priv, urb, urb->status);
} else if (usb_pipebulk(urb->pipe) && (length < qtd->length)) {
/* short BULK received */
if (urb->transfer_flags & URB_SHORT_NOT_OK) {
urb->status = -EREMOTEIO;
isp1760_dbg(priv, "short bulk, %d instead %zu "
"with URB_SHORT_NOT_OK flag.\n",
length, qtd->length);
}
if (urb->status == -EINPROGRESS)
urb->status = 0;
qtd = clean_up_qtdlist(qtd);
isp1760_urb_done(priv, urb, urb->status);
} else if (qtd->status & URB_COMPLETE_NOTIFY) {
/* that was the last qtd of that URB */
if (urb->status == -EINPROGRESS)
urb->status = 0;
qtd = clean_this_qtd(qtd);
isp1760_urb_done(priv, urb, urb->status);
} else {
/* next QTD of this URB */
qtd = clean_this_qtd(qtd);
BUG_ON(!qtd);
}
if (qtd)
enqueue_an_ATL_packet(usb_hcd, qh, qtd);
skip_map = isp1760_readl(usb_hcd->regs +
HC_ATL_PTD_SKIPMAP_REG);
}
}
static void do_intl_int(struct usb_hcd *usb_hcd)
{
struct isp1760_hcd *priv = hcd_to_priv(usb_hcd);
u32 done_map, skip_map;
struct ptd ptd;
struct urb *urb = NULL;
u32 int_regs;
u32 int_regs_base;
u32 payload;
u32 length;
u32 or_map;
int error;
u32 queue_entry;
struct isp1760_qtd *qtd;
struct isp1760_qh *qh;
done_map = isp1760_readl(usb_hcd->regs +
HC_INT_PTD_DONEMAP_REG);
skip_map = isp1760_readl(usb_hcd->regs +
HC_INT_PTD_SKIPMAP_REG);
or_map = isp1760_readl(usb_hcd->regs + HC_INT_IRQ_MASK_OR_REG);
or_map &= ~done_map;
isp1760_writel(or_map, usb_hcd->regs + HC_INT_IRQ_MASK_OR_REG);
int_regs_base = INT_REGS_OFFSET;
while (done_map) {
u32 dw1;
u32 dw3;
queue_entry = __ffs(done_map);
done_map &= ~(1 << queue_entry);
skip_map |= 1 << queue_entry;
int_regs = int_regs_base + queue_entry * sizeof(struct ptd);
urb = priv->int_ints[queue_entry].urb;
qtd = priv->int_ints[queue_entry].qtd;
qh = priv->int_ints[queue_entry].qh;
payload = priv->int_ints[queue_entry].payload;
if (!qh) {
printk(KERN_ERR "(INT) qh is 0\n");
continue;
}
isp1760_writel(int_regs + ISP_BANK(0), usb_hcd->regs +
HC_MEMORY_REG);
isp1760_writel(payload + ISP_BANK(1), usb_hcd->regs +
HC_MEMORY_REG);
/*
* write bank1 address twice to ensure the 90ns delay (time
* between BANK0 write and the priv_read_copy() call is at
* least 3*t_WHWL + 2*t_w11 = 3*25ns + 2*17ns = 92ns)
*/
isp1760_writel(payload + ISP_BANK(1), usb_hcd->regs +
HC_MEMORY_REG);
priv_read_copy(priv, (u32 *)&ptd, usb_hcd->regs + int_regs +
ISP_BANK(0), sizeof(ptd));
dw1 = le32_to_cpu(ptd.dw1);
dw3 = le32_to_cpu(ptd.dw3);
check_int_err_status(le32_to_cpu(ptd.dw4));
error = check_error(&ptd);
if (error) {
#if 0
printk(KERN_ERR "Error in %s().\n", __func__);
printk(KERN_ERR "IN dw0: %08x dw1: %08x dw2: %08x "
"dw3: %08x dw4: %08x dw5: %08x dw6: "
"%08x dw7: %08x\n",
ptd.dw0, ptd.dw1, ptd.dw2, ptd.dw3,
ptd.dw4, ptd.dw5, ptd.dw6, ptd.dw7);
#endif
urb->status = -EPIPE;
priv->int_ints[queue_entry].qh->toggle = 0;
priv->int_ints[queue_entry].qh->ping = 0;
} else {
priv->int_ints[queue_entry].qh->toggle =
dw3 & (1 << 25);
priv->int_ints[queue_entry].qh->ping = dw3 & (1 << 26);
}
if (urb->dev->speed != USB_SPEED_HIGH)
length = PTD_XFERRED_LENGTH_LO(dw3);
else
length = PTD_XFERRED_LENGTH(dw3);
if (length) {
switch (DW1_GET_PID(dw1)) {
case IN_PID:
priv_read_copy(priv,
priv->int_ints[queue_entry].data_buffer,
usb_hcd->regs + payload + ISP_BANK(1),
length);
case OUT_PID:
urb->actual_length += length;
case SETUP_PID:
break;
}
}
priv->int_ints[queue_entry].data_buffer = NULL;
priv->int_ints[queue_entry].urb = NULL;
priv->int_ints[queue_entry].qtd = NULL;
priv->int_ints[queue_entry].qh = NULL;
isp1760_writel(skip_map, usb_hcd->regs +
HC_INT_PTD_SKIPMAP_REG);
free_mem(priv, payload);
if (urb->status == -EPIPE) {
/* HALT received */
qtd = clean_up_qtdlist(qtd);
isp1760_urb_done(priv, urb, urb->status);
} else if (qtd->status & URB_COMPLETE_NOTIFY) {
if (urb->status == -EINPROGRESS)
urb->status = 0;
qtd = clean_this_qtd(qtd);
isp1760_urb_done(priv, urb, urb->status);
} else {
/* next QTD of this URB */
qtd = clean_this_qtd(qtd);
BUG_ON(!qtd);
}
if (qtd)
enqueue_an_INT_packet(usb_hcd, qh, qtd);
skip_map = isp1760_readl(usb_hcd->regs +
HC_INT_PTD_SKIPMAP_REG);
}
}
#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
static struct isp1760_qh *qh_make(struct isp1760_hcd *priv, struct urb *urb,
gfp_t flags)
{
struct isp1760_qh *qh;
int is_input, type;
qh = isp1760_qh_alloc(priv, flags);
if (!qh)
return qh;
/*
* init endpoint/device data for this QH
*/
is_input = usb_pipein(urb->pipe);
type = usb_pipetype(urb->pipe);
if (type == PIPE_INTERRUPT) {
if (urb->dev->speed == USB_SPEED_HIGH) {
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.
*/
printk(KERN_ERR "intr period %d uframes, NYET!",
urb->interval);
qh_destroy(qh);
return NULL;
}
} else {
qh->period = urb->interval;
}
}
/* support for tt scheduling, and access to toggles */
qh->dev = urb->dev;
if (!usb_pipecontrol(urb->pipe))
usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input,
1);
return qh;
}
/*
* 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 isp1760_qh *qh_append_tds(struct isp1760_hcd *priv,
struct urb *urb, struct list_head *qtd_list, int epnum,
void **ptr)
{
struct isp1760_qh *qh;
struct isp1760_qtd *qtd;
struct isp1760_qtd *prev_qtd;
qh = (struct isp1760_qh *)*ptr;
if (!qh) {
/* can't sleep here, we have priv->lock... */
qh = qh_make(priv, urb, GFP_ATOMIC);
if (!qh)
return qh;
*ptr = qh;
}
qtd = list_entry(qtd_list->next, struct isp1760_qtd,
qtd_list);
if (!list_empty(&qh->qtd_list))
prev_qtd = list_entry(qh->qtd_list.prev,
struct isp1760_qtd, qtd_list);
else
prev_qtd = NULL;
list_splice(qtd_list, qh->qtd_list.prev);
if (prev_qtd) {
BUG_ON(prev_qtd->hw_next);
prev_qtd->hw_next = qtd;
}
urb->hcpriv = qh;
return qh;
}
static void qtd_list_free(struct isp1760_hcd *priv, struct urb *urb,
struct list_head *qtd_list)
{
struct list_head *entry, *temp;
list_for_each_safe(entry, temp, qtd_list) {
struct isp1760_qtd *qtd;
qtd = list_entry(entry, struct isp1760_qtd, qtd_list);
list_del(&qtd->qtd_list);
isp1760_qtd_free(qtd);
}
}
static int isp1760_prepare_enqueue(struct isp1760_hcd *priv, struct urb *urb,
struct list_head *qtd_list, gfp_t mem_flags, packet_enqueue *p)
{
struct isp1760_qtd *qtd;
int epnum;
unsigned long flags;
struct isp1760_qh *qh = NULL;
int rc;
int qh_busy;
qtd = list_entry(qtd_list->next, struct isp1760_qtd, qtd_list);
epnum = urb->ep->desc.bEndpointAddress;
spin_lock_irqsave(&priv->lock, flags);
if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &priv_to_hcd(priv)->flags)) {
rc = -ESHUTDOWN;
goto done;
}
rc = usb_hcd_link_urb_to_ep(priv_to_hcd(priv), urb);
if (rc)
goto done;
qh = urb->ep->hcpriv;
if (qh)
qh_busy = !list_empty(&qh->qtd_list);
else
qh_busy = 0;
qh = qh_append_tds(priv, urb, qtd_list, epnum, &urb->ep->hcpriv);
if (!qh) {
usb_hcd_unlink_urb_from_ep(priv_to_hcd(priv), urb);
rc = -ENOMEM;
goto done;
}
if (!qh_busy)
p(priv_to_hcd(priv), qh, qtd);
done:
spin_unlock_irqrestore(&priv->lock, flags);
if (!qh)
qtd_list_free(priv, urb, qtd_list);
return rc;
}
static struct isp1760_qtd *isp1760_qtd_alloc(struct isp1760_hcd *priv,
gfp_t flags)
{
struct isp1760_qtd *qtd;
qtd = kmem_cache_zalloc(qtd_cachep, flags);
if (qtd)
INIT_LIST_HEAD(&qtd->qtd_list);
return qtd;
}
/*
* create a list of filled qtds for this URB; won't link into qh.
*/
static struct list_head *qh_urb_transaction(struct isp1760_hcd *priv,
struct urb *urb, struct list_head *head, gfp_t flags)
{
struct isp1760_qtd *qtd, *qtd_prev;
void *buf;
int len, maxpacket;
int is_input;
u32 token;
/*
* URBs map to sequences of QTDs: one logical transaction
*/
qtd = isp1760_qtd_alloc(priv, flags);
if (!qtd)
return NULL;
list_add_tail(&qtd->qtd_list, head);
qtd->urb = urb;
urb->status = -EINPROGRESS;
token = 0;
/* for split transactions, SplitXState initialized to zero */
len = urb->transfer_buffer_length;
is_input = usb_pipein(urb->pipe);
if (usb_pipecontrol(urb->pipe)) {
/* SETUP pid */
qtd_fill(qtd, urb->setup_packet,
sizeof(struct usb_ctrlrequest),
token | SETUP_PID);
/* ... and always at least one more pid */
token ^= DATA_TOGGLE;
qtd_prev = qtd;
qtd = isp1760_qtd_alloc(priv, flags);
if (!qtd)
goto cleanup;
qtd->urb = urb;
qtd_prev->hw_next = qtd;
list_add_tail(&qtd->qtd_list, head);
/* for zero length DATA stages, STATUS is always IN */
if (len == 0)
token |= IN_PID;
}
/*
* data transfer stage: buffer setup
*/
buf = urb->transfer_buffer;
if (is_input)
token |= IN_PID;
else
token |= OUT_PID;
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;
if (!buf && len) {
/* XXX This looks like usb storage / SCSI bug */
printk(KERN_ERR "buf is null, dma is %08lx len is %d\n",
(long unsigned)urb->transfer_dma, len);
WARN_ON(1);
}
this_qtd_len = qtd_fill(qtd, buf, len, token);
len -= this_qtd_len;
buf += this_qtd_len;
/* qh makes control packets use qtd toggle; maybe switch it */
if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
token ^= DATA_TOGGLE;
if (len <= 0)
break;
qtd_prev = qtd;
qtd = isp1760_qtd_alloc(priv, flags);
if (!qtd)
goto cleanup;
qtd->urb = urb;
qtd_prev->hw_next = qtd;
list_add_tail(&qtd->qtd_list, head);
}
/*
* control requests may need a terminating data "status" ack;
* bulk ones may need a terminating short packet (zero length).
*/
if (urb->transfer_buffer_length != 0) {
int one_more = 0;
if (usb_pipecontrol(urb->pipe)) {
one_more = 1;
/* "in" <--> "out" */
token ^= IN_PID;
/* force DATA1 */
token |= DATA_TOGGLE;
} 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 = isp1760_qtd_alloc(priv, flags);
if (!qtd)
goto cleanup;
qtd->urb = urb;
qtd_prev->hw_next = qtd;
list_add_tail(&qtd->qtd_list, head);
/* never any data in such packets */
qtd_fill(qtd, NULL, 0, token);
}
}
qtd->status = URB_COMPLETE_NOTIFY;
return head;
cleanup:
qtd_list_free(priv, urb, head);
return NULL;
}
static int isp1760_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
gfp_t mem_flags)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
struct list_head qtd_list;
packet_enqueue *pe;
INIT_LIST_HEAD(&qtd_list);
switch (usb_pipetype(urb->pipe)) {
case PIPE_CONTROL:
case PIPE_BULK:
if (!qh_urb_transaction(priv, urb, &qtd_list, mem_flags))
return -ENOMEM;
pe = enqueue_an_ATL_packet;
break;
case PIPE_INTERRUPT:
if (!qh_urb_transaction(priv, urb, &qtd_list, mem_flags))
return -ENOMEM;
pe = enqueue_an_INT_packet;
break;
case PIPE_ISOCHRONOUS:
printk(KERN_ERR "PIPE_ISOCHRONOUS ain't supported\n");
default:
return -EPIPE;
}
return isp1760_prepare_enqueue(priv, urb, &qtd_list, mem_flags, pe);
}
static int isp1760_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
int status)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
struct inter_packet_info *ints;
u32 i;
u32 reg_base, or_reg, skip_reg;
unsigned long flags;
struct ptd ptd;
packet_enqueue *pe;
switch (usb_pipetype(urb->pipe)) {
case PIPE_ISOCHRONOUS:
return -EPIPE;
break;
case PIPE_INTERRUPT:
ints = priv->int_ints;
reg_base = INT_REGS_OFFSET;
or_reg = HC_INT_IRQ_MASK_OR_REG;
skip_reg = HC_INT_PTD_SKIPMAP_REG;
pe = enqueue_an_INT_packet;
break;
default:
ints = priv->atl_ints;
reg_base = ATL_REGS_OFFSET;
or_reg = HC_ATL_IRQ_MASK_OR_REG;
skip_reg = HC_ATL_PTD_SKIPMAP_REG;
pe = enqueue_an_ATL_packet;
break;
}
memset(&ptd, 0, sizeof(ptd));
spin_lock_irqsave(&priv->lock, flags);
for (i = 0; i < 32; i++) {
if (ints->urb == urb) {
u32 skip_map;
u32 or_map;
struct isp1760_qtd *qtd;
struct isp1760_qh *qh = ints->qh;
skip_map = isp1760_readl(hcd->regs + skip_reg);
skip_map |= 1 << i;
isp1760_writel(skip_map, hcd->regs + skip_reg);
or_map = isp1760_readl(hcd->regs + or_reg);
or_map &= ~(1 << i);
isp1760_writel(or_map, hcd->regs + or_reg);
priv_write_copy(priv, (u32 *)&ptd, hcd->regs + reg_base
+ i * sizeof(ptd), sizeof(ptd));
qtd = ints->qtd;
qtd = clean_up_qtdlist(qtd);
free_mem(priv, ints->payload);
ints->urb = NULL;
ints->qh = NULL;
ints->qtd = NULL;
ints->data_buffer = NULL;
ints->payload = 0;
isp1760_urb_done(priv, urb, status);
if (qtd)
pe(hcd, qh, qtd);
break;
} else if (ints->qtd) {
struct isp1760_qtd *qtd, *prev_qtd = ints->qtd;
for (qtd = ints->qtd->hw_next; qtd; qtd = qtd->hw_next) {
if (qtd->urb == urb) {
prev_qtd->hw_next = clean_up_qtdlist(qtd);
isp1760_urb_done(priv, urb, status);
break;
}
prev_qtd = qtd;
}
/* we found the urb before the end of the list */
if (qtd)
break;
}
ints++;
}
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
static irqreturn_t isp1760_irq(struct usb_hcd *usb_hcd)
{
struct isp1760_hcd *priv = hcd_to_priv(usb_hcd);
u32 imask;
irqreturn_t irqret = IRQ_NONE;
spin_lock(&priv->lock);
if (!(usb_hcd->state & HC_STATE_RUNNING))
goto leave;
imask = isp1760_readl(usb_hcd->regs + HC_INTERRUPT_REG);
if (unlikely(!imask))
goto leave;
isp1760_writel(imask, usb_hcd->regs + HC_INTERRUPT_REG);
if (imask & HC_ATL_INT)
do_atl_int(usb_hcd);
if (imask & HC_INTL_INT)
do_intl_int(usb_hcd);
irqret = IRQ_HANDLED;
leave:
spin_unlock(&priv->lock);
return irqret;
}
static int isp1760_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
u32 temp, status = 0;
u32 mask;
int 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;
mask = PORT_CSC;
spin_lock_irqsave(&priv->lock, flags);
temp = isp1760_readl(hcd->regs + HC_PORTSC1);
if (temp & PORT_OWNER) {
if (temp & PORT_CSC) {
temp &= ~PORT_CSC;
isp1760_writel(temp, hcd->regs + HC_PORTSC1);
goto done;
}
}
/*
* 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 & mask) != 0
|| ((temp & PORT_RESUME) != 0
&& time_after_eq(jiffies,
priv->reset_done))) {
buf [0] |= 1 << (0 + 1);
status = STS_PCD;
}
/* FIXME autosuspend idle root hubs */
done:
spin_unlock_irqrestore(&priv->lock, flags);
return status ? retval : 0;
}
static void isp1760_hub_descriptor(struct isp1760_hcd *priv,
struct usb_hub_descriptor *desc)
{
int ports = HCS_N_PORTS(priv->hcs_params);
u16 temp;
desc->bDescriptorType = 0x29;
/* priv 1.0, 2.3.9 says 20ms max */
desc->bPwrOn2PwrGood = 10;
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);
/* per-port overcurrent reporting */
temp = 0x0008;
if (HCS_PPC(priv->hcs_params))
/* per-port power control */
temp |= 0x0001;
else
/* no power switching */
temp |= 0x0002;
desc->wHubCharacteristics = cpu_to_le16(temp);
}
#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
static int check_reset_complete(struct isp1760_hcd *priv, int index,
u32 __iomem *status_reg, int port_status)
{
if (!(port_status & PORT_CONNECT))
return port_status;
/* if reset finished and it's still not enabled -- handoff */
if (!(port_status & PORT_PE)) {
printk(KERN_ERR "port %d full speed --> companion\n",
index + 1);
port_status |= PORT_OWNER;
port_status &= ~PORT_RWC_BITS;
isp1760_writel(port_status, status_reg);
} else
printk(KERN_ERR "port %d high speed\n", index + 1);
return port_status;
}
static int isp1760_hub_control(struct usb_hcd *hcd, u16 typeReq,
u16 wValue, u16 wIndex, char *buf, u16 wLength)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
int ports = HCS_N_PORTS(priv->hcs_params);
u32 __iomem *status_reg = hcd->regs + HC_PORTSC1;
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(&priv->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 = isp1760_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:
isp1760_writel(temp & ~PORT_PE, status_reg);
break;
case USB_PORT_FEAT_C_ENABLE:
/* XXX error? */
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);
isp1760_writel(temp | PORT_RESUME,
status_reg);
priv->reset_done = 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(priv->hcs_params))
isp1760_writel(temp & ~PORT_POWER, status_reg);
break;
case USB_PORT_FEAT_C_CONNECTION:
isp1760_writel(temp | PORT_CSC,
status_reg);
break;
case USB_PORT_FEAT_C_OVER_CURRENT:
/* XXX error ?*/
break;
case USB_PORT_FEAT_C_RESET:
/* GetPortStatus clears reset */
break;
default:
goto error;
}
isp1760_readl(hcd->regs + HC_USBCMD);
break;
case GetHubDescriptor:
isp1760_hub_descriptor(priv, (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 = isp1760_readl(status_reg);
/* wPortChange bits */
if (temp & PORT_CSC)
status |= 1 << USB_PORT_FEAT_C_CONNECTION;
/* whoever resumes must GetPortStatus to complete it!! */
if (temp & PORT_RESUME) {
printk(KERN_ERR "Port resume should be skipped.\n");
/* Remote Wakeup received? */
if (!priv->reset_done) {
/* resume signaling for 20 msec */
priv->reset_done = jiffies
+ msecs_to_jiffies(20);
/* check the port again */
mod_timer(&priv_to_hcd(priv)->rh_timer,
priv->reset_done);
}
/* resume completed? */
else if (time_after_eq(jiffies,
priv->reset_done)) {
status |= 1 << USB_PORT_FEAT_C_SUSPEND;
priv->reset_done = 0;
/* stop resume signaling */
temp = isp1760_readl(status_reg);
isp1760_writel(
temp & ~(PORT_RWC_BITS | PORT_RESUME),
status_reg);
retval = handshake(priv, status_reg,
PORT_RESUME, 0, 2000 /* 2msec */);
if (retval != 0) {
isp1760_err(priv,
"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,
priv->reset_done)) {
status |= 1 << USB_PORT_FEAT_C_RESET;
priv->reset_done = 0;
/* force reset to complete */
isp1760_writel(temp & ~PORT_RESET,
status_reg);
/* REVISIT: some hardware needs 550+ usec to clear
* this bit; seems too long to spin routinely...
*/
retval = handshake(priv, status_reg,
PORT_RESET, 0, 750);
if (retval != 0) {
isp1760_err(priv, "port %d reset error %d\n",
wIndex + 1, retval);
goto error;
}
/* see what we found out */
temp = check_reset_complete(priv, wIndex, status_reg,
isp1760_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_OWNER)
printk(KERN_ERR "Warning: PORT_OWNER is set\n");
if (temp & PORT_CONNECT) {
status |= 1 << USB_PORT_FEAT_CONNECTION;
/* status may be from integrated TT */
status |= ehci_port_speed(priv, 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_RESET)
status |= 1 << USB_PORT_FEAT_RESET;
if (temp & PORT_POWER)
status |= 1 << USB_PORT_FEAT_POWER;
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 = isp1760_readl(status_reg);
if (temp & PORT_OWNER)
break;
/* temp &= ~PORT_RWC_BITS; */
switch (wValue) {
case USB_PORT_FEAT_ENABLE:
isp1760_writel(temp | PORT_PE, status_reg);
break;
case USB_PORT_FEAT_SUSPEND:
if ((temp & PORT_PE) == 0
|| (temp & PORT_RESET) != 0)
goto error;
isp1760_writel(temp | PORT_SUSPEND, status_reg);
break;
case USB_PORT_FEAT_POWER:
if (HCS_PPC(priv->hcs_params))
isp1760_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.
*/
if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
&& PORT_USB11(temp)) {
temp |= PORT_OWNER;
} else {
temp |= PORT_RESET;
temp &= ~PORT_PE;
/*
* caller must wait, then call GetPortStatus
* usb 2.0 spec says 50 ms resets on root
*/
priv->reset_done = jiffies +
msecs_to_jiffies(50);
}
isp1760_writel(temp, status_reg);
break;
default:
goto error;
}
isp1760_readl(hcd->regs + HC_USBCMD);
break;
default:
error:
/* "stall" on error */
retval = -EPIPE;
}
spin_unlock_irqrestore(&priv->lock, flags);
return retval;
}
static void isp1760_endpoint_disable(struct usb_hcd *usb_hcd,
struct usb_host_endpoint *ep)
{
struct isp1760_hcd *priv = hcd_to_priv(usb_hcd);
struct isp1760_qh *qh;
struct isp1760_qtd *qtd;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
qh = ep->hcpriv;
if (!qh)
goto out;
ep->hcpriv = NULL;
do {
/* more than entry might get removed */
if (list_empty(&qh->qtd_list))
break;
qtd = list_first_entry(&qh->qtd_list, struct isp1760_qtd,
qtd_list);
if (qtd->status & URB_ENQUEUED) {
spin_unlock_irqrestore(&priv->lock, flags);
isp1760_urb_dequeue(usb_hcd, qtd->urb, -ECONNRESET);
spin_lock_irqsave(&priv->lock, flags);
} else {
struct urb *urb;
urb = qtd->urb;
clean_up_qtdlist(qtd);
isp1760_urb_done(priv, urb, -ECONNRESET);
}
} while (1);
qh_destroy(qh);
/* remove requests and leak them.
* ATL are pretty fast done, INT could take a while...
* The latter shoule be removed
*/
out:
spin_unlock_irqrestore(&priv->lock, flags);
}
static int isp1760_get_frame(struct usb_hcd *hcd)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
u32 fr;
fr = isp1760_readl(hcd->regs + HC_FRINDEX);
return (fr >> 3) % priv->periodic_size;
}
static void isp1760_stop(struct usb_hcd *hcd)
{
struct isp1760_hcd *priv = hcd_to_priv(hcd);
u32 temp;
isp1760_hub_control(hcd, ClearPortFeature, USB_PORT_FEAT_POWER, 1,
NULL, 0);
mdelay(20);
spin_lock_irq(&priv->lock);
ehci_reset(priv);
/* Disable IRQ */
temp = isp1760_readl(hcd->regs + HC_HW_MODE_CTRL);
isp1760_writel(temp &= ~HW_GLOBAL_INTR_EN, hcd->regs + HC_HW_MODE_CTRL);
spin_unlock_irq(&priv->lock);
isp1760_writel(0, hcd->regs + HC_CONFIGFLAG);
}
static void isp1760_shutdown(struct usb_hcd *hcd)
{
u32 command, temp;
isp1760_stop(hcd);
temp = isp1760_readl(hcd->regs + HC_HW_MODE_CTRL);
isp1760_writel(temp &= ~HW_GLOBAL_INTR_EN, hcd->regs + HC_HW_MODE_CTRL);
command = isp1760_readl(hcd->regs + HC_USBCMD);
command &= ~CMD_RUN;
isp1760_writel(command, hcd->regs + HC_USBCMD);
}
static const struct hc_driver isp1760_hc_driver = {
.description = "isp1760-hcd",
.product_desc = "NXP ISP1760 USB Host Controller",
.hcd_priv_size = sizeof(struct isp1760_hcd),
.irq = isp1760_irq,
.flags = HCD_MEMORY | HCD_USB2,
.reset = isp1760_hc_setup,
.start = isp1760_run,
.stop = isp1760_stop,
.shutdown = isp1760_shutdown,
.urb_enqueue = isp1760_urb_enqueue,
.urb_dequeue = isp1760_urb_dequeue,
.endpoint_disable = isp1760_endpoint_disable,
.get_frame_number = isp1760_get_frame,
.hub_status_data = isp1760_hub_status_data,
.hub_control = isp1760_hub_control,
};
int __init init_kmem_once(void)
{
qtd_cachep = kmem_cache_create("isp1760_qtd",
sizeof(struct isp1760_qtd), 0, SLAB_TEMPORARY |
SLAB_MEM_SPREAD, NULL);
if (!qtd_cachep)
return -ENOMEM;
qh_cachep = kmem_cache_create("isp1760_qh", sizeof(struct isp1760_qh),
0, SLAB_TEMPORARY | SLAB_MEM_SPREAD, NULL);
if (!qh_cachep) {
kmem_cache_destroy(qtd_cachep);
return -ENOMEM;
}
return 0;
}
void deinit_kmem_cache(void)
{
kmem_cache_destroy(qtd_cachep);
kmem_cache_destroy(qh_cachep);
}
struct usb_hcd *isp1760_register(phys_addr_t res_start, resource_size_t res_len,
int irq, unsigned long irqflags,
struct device *dev, const char *busname,
unsigned int devflags)
{
struct usb_hcd *hcd;
struct isp1760_hcd *priv;
int ret;
if (usb_disabled())
return ERR_PTR(-ENODEV);
/* prevent usb-core allocating DMA pages */
dev->dma_mask = NULL;
hcd = usb_create_hcd(&isp1760_hc_driver, dev, dev_name(dev));
if (!hcd)
return ERR_PTR(-ENOMEM);
priv = hcd_to_priv(hcd);
priv->devflags = devflags;
init_memory(priv);
hcd->regs = ioremap(res_start, res_len);
if (!hcd->regs) {
ret = -EIO;
goto err_put;
}
hcd->irq = irq;
hcd->rsrc_start = res_start;
hcd->rsrc_len = res_len;
ret = usb_add_hcd(hcd, irq, irqflags);
if (ret)
goto err_unmap;
return hcd;
err_unmap:
iounmap(hcd->regs);
err_put:
usb_put_hcd(hcd);
return ERR_PTR(ret);
}
MODULE_DESCRIPTION("Driver for the ISP1760 USB-controller from NXP");
MODULE_AUTHOR("Sebastian Siewior <bigeasy@linuxtronix.de>");
MODULE_LICENSE("GPL v2");