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linux-next/drivers/usb/gadget/imx_udc.h
Darius Augulis b633d28e2c USB: imx_udc: Fix IMX UDC gadget general irq handling 
Workaround of hw bug in IMX UDC.
This bug causes wrong handling of CFG_CHG interrupt.
Workaround is documented inline source code.

Signed-off-by: Darius Augulis <augulis.darius@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:29 -07:00

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/*
* Copyright (C) 2005 Mike Lee(eemike@gmail.com)
*
* This udc driver is now under testing and code is based on pxa2xx_udc.h
* Please use it with your own risk!
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __LINUX_USB_GADGET_IMX_H
#define __LINUX_USB_GADGET_IMX_H
#include <linux/types.h>
/* Helper macros */
#define EP_NO(ep) ((ep->bEndpointAddress) & ~USB_DIR_IN) /* IN:1, OUT:0 */
#define EP_DIR(ep) ((ep->bEndpointAddress) & USB_DIR_IN ? 1 : 0)
#define irq_to_ep(irq) (((irq) >= USBD_INT0) || ((irq) <= USBD_INT6) \
? ((irq) - USBD_INT0) : (USBD_INT6)) /*should not happen*/
#define ep_to_irq(ep) (EP_NO((ep)) + USBD_INT0)
#define IMX_USB_NB_EP 6
/* Driver structures */
struct imx_request {
struct usb_request req;
struct list_head queue;
unsigned int in_use;
};
enum ep0_state {
EP0_IDLE,
EP0_IN_DATA_PHASE,
EP0_OUT_DATA_PHASE,
EP0_CONFIG,
EP0_STALL,
};
struct imx_ep_struct {
struct usb_ep ep;
struct imx_udc_struct *imx_usb;
struct list_head queue;
unsigned char stopped;
unsigned char fifosize;
unsigned char bEndpointAddress;
unsigned char bmAttributes;
};
struct imx_udc_struct {
struct usb_gadget gadget;
struct usb_gadget_driver *driver;
struct device *dev;
struct imx_ep_struct imx_ep[IMX_USB_NB_EP];
struct clk *clk;
struct timer_list timer;
enum ep0_state ep0state;
struct resource *res;
void __iomem *base;
unsigned char set_config;
int cfg,
intf,
alt,
usbd_int[7];
};
/* USB registers */
#define USB_FRAME (0x00) /* USB frame */
#define USB_SPEC (0x04) /* USB Spec */
#define USB_STAT (0x08) /* USB Status */
#define USB_CTRL (0x0C) /* USB Control */
#define USB_DADR (0x10) /* USB Desc RAM addr */
#define USB_DDAT (0x14) /* USB Desc RAM/EP buffer data */
#define USB_INTR (0x18) /* USB interrupt */
#define USB_MASK (0x1C) /* USB Mask */
#define USB_ENAB (0x24) /* USB Enable */
#define USB_EP_STAT(x) (0x30 + (x*0x30)) /* USB status/control */
#define USB_EP_INTR(x) (0x34 + (x*0x30)) /* USB interrupt */
#define USB_EP_MASK(x) (0x38 + (x*0x30)) /* USB mask */
#define USB_EP_FDAT(x) (0x3C + (x*0x30)) /* USB FIFO data */
#define USB_EP_FDAT0(x) (0x3C + (x*0x30)) /* USB FIFO data */
#define USB_EP_FDAT1(x) (0x3D + (x*0x30)) /* USB FIFO data */
#define USB_EP_FDAT2(x) (0x3E + (x*0x30)) /* USB FIFO data */
#define USB_EP_FDAT3(x) (0x3F + (x*0x30)) /* USB FIFO data */
#define USB_EP_FSTAT(x) (0x40 + (x*0x30)) /* USB FIFO status */
#define USB_EP_FCTRL(x) (0x44 + (x*0x30)) /* USB FIFO control */
#define USB_EP_LRFP(x) (0x48 + (x*0x30)) /* USB last rd f. pointer */
#define USB_EP_LWFP(x) (0x4C + (x*0x30)) /* USB last wr f. pointer */
#define USB_EP_FALRM(x) (0x50 + (x*0x30)) /* USB FIFO alarm */
#define USB_EP_FRDP(x) (0x54 + (x*0x30)) /* USB FIFO read pointer */
#define USB_EP_FWRP(x) (0x58 + (x*0x30)) /* USB FIFO write pointer */
/* USB Control Register Bit Fields.*/
#define CTRL_CMDOVER (1<<6) /* UDC status */
#define CTRL_CMDERROR (1<<5) /* UDC status */
#define CTRL_FE_ENA (1<<3) /* Enable Font End logic */
#define CTRL_UDC_RST (1<<2) /* UDC reset */
#define CTRL_AFE_ENA (1<<1) /* Analog Font end enable */
#define CTRL_RESUME (1<<0) /* UDC resume */
/* USB Status Register Bit Fields.*/
#define STAT_RST (1<<8)
#define STAT_SUSP (1<<7)
#define STAT_CFG (3<<5)
#define STAT_INTF (3<<3)
#define STAT_ALTSET (7<<0)
/* USB Interrupt Status/Mask Registers Bit fields */
#define INTR_WAKEUP (1<<31) /* Wake up Interrupt */
#define INTR_MSOF (1<<7) /* Missed Start of Frame */
#define INTR_SOF (1<<6) /* Start of Frame */
#define INTR_RESET_STOP (1<<5) /* Reset Signaling stop */
#define INTR_RESET_START (1<<4) /* Reset Signaling start */
#define INTR_RESUME (1<<3) /* Suspend to resume */
#define INTR_SUSPEND (1<<2) /* Active to suspend */
#define INTR_FRAME_MATCH (1<<1) /* Frame matched */
#define INTR_CFG_CHG (1<<0) /* Configuration change occurred */
/* USB Enable Register Bit Fields.*/
#define ENAB_RST (1<<31) /* Reset USB modules */
#define ENAB_ENAB (1<<30) /* Enable USB modules*/
#define ENAB_SUSPEND (1<<29) /* Suspend USB modules */
#define ENAB_ENDIAN (1<<28) /* Endian of USB modules */
#define ENAB_PWRMD (1<<0) /* Power mode of USB modules */
/* USB Descriptor Ram Address Register bit fields */
#define DADR_CFG (1<<31) /* Configuration */
#define DADR_BSY (1<<30) /* Busy status */
#define DADR_DADR (0x1FF) /* Descriptor Ram Address */
/* USB Descriptor RAM/Endpoint Buffer Data Register bit fields */
#define DDAT_DDAT (0xFF) /* Descriptor Endpoint Buffer */
/* USB Endpoint Status Register bit fields */
#define EPSTAT_BCOUNT (0x7F<<16) /* Endpoint FIFO byte count */
#define EPSTAT_SIP (1<<8) /* Endpoint setup in progress */
#define EPSTAT_DIR (1<<7) /* Endpoint transfer direction */
#define EPSTAT_MAX (3<<5) /* Endpoint Max packet size */
#define EPSTAT_TYP (3<<3) /* Endpoint type */
#define EPSTAT_ZLPS (1<<2) /* Send zero length packet */
#define EPSTAT_FLUSH (1<<1) /* Endpoint FIFO Flush */
#define EPSTAT_STALL (1<<0) /* Force stall */
/* USB Endpoint FIFO Status Register bit fields */
#define FSTAT_FRAME_STAT (0xF<<24) /* Frame status bit [0-3] */
#define FSTAT_ERR (1<<22) /* FIFO error */
#define FSTAT_UF (1<<21) /* FIFO underflow */
#define FSTAT_OF (1<<20) /* FIFO overflow */
#define FSTAT_FR (1<<19) /* FIFO frame ready */
#define FSTAT_FULL (1<<18) /* FIFO full */
#define FSTAT_ALRM (1<<17) /* FIFO alarm */
#define FSTAT_EMPTY (1<<16) /* FIFO empty */
/* USB Endpoint FIFO Control Register bit fields */
#define FCTRL_WFR (1<<29) /* Write frame end */
/* USB Endpoint Interrupt Status Regsiter bit fields */
#define EPINTR_FIFO_FULL (1<<8) /* fifo full */
#define EPINTR_FIFO_EMPTY (1<<7) /* fifo empty */
#define EPINTR_FIFO_ERROR (1<<6) /* fifo error */
#define EPINTR_FIFO_HIGH (1<<5) /* fifo high */
#define EPINTR_FIFO_LOW (1<<4) /* fifo low */
#define EPINTR_MDEVREQ (1<<3) /* multi Device request */
#define EPINTR_EOT (1<<2) /* fifo end of transfer */
#define EPINTR_DEVREQ (1<<1) /* Device request */
#define EPINTR_EOF (1<<0) /* fifo end of frame */
/* Debug macros */
#ifdef DEBUG
/* #define DEBUG_REQ */
/* #define DEBUG_TRX */
/* #define DEBUG_INIT */
/* #define DEBUG_EP0 */
/* #define DEBUG_EPX */
/* #define DEBUG_IRQ */
/* #define DEBUG_EPIRQ */
/* #define DEBUG_DUMP */
/* #define DEBUG_ERR */
#ifdef DEBUG_REQ
#define D_REQ(dev, args...) dev_dbg(dev, ## args)
#else
#define D_REQ(dev, args...) do {} while (0)
#endif /* DEBUG_REQ */
#ifdef DEBUG_TRX
#define D_TRX(dev, args...) dev_dbg(dev, ## args)
#else
#define D_TRX(dev, args...) do {} while (0)
#endif /* DEBUG_TRX */
#ifdef DEBUG_INIT
#define D_INI(dev, args...) dev_dbg(dev, ## args)
#else
#define D_INI(dev, args...) do {} while (0)
#endif /* DEBUG_INIT */
#ifdef DEBUG_EP0
static const char *state_name[] = {
"EP0_IDLE",
"EP0_IN_DATA_PHASE",
"EP0_OUT_DATA_PHASE",
"EP0_CONFIG",
"EP0_STALL"
};
#define D_EP0(dev, args...) dev_dbg(dev, ## args)
#else
#define D_EP0(dev, args...) do {} while (0)
#endif /* DEBUG_EP0 */
#ifdef DEBUG_EPX
#define D_EPX(dev, args...) dev_dbg(dev, ## args)
#else
#define D_EPX(dev, args...) do {} while (0)
#endif /* DEBUG_EP0 */
#ifdef DEBUG_IRQ
static void dump_intr(const char *label, int irqreg, struct device *dev)
{
dev_dbg(dev, "<%s> USB_INTR=[%s%s%s%s%s%s%s%s%s]\n", label,
(irqreg & INTR_WAKEUP) ? " wake" : "",
(irqreg & INTR_MSOF) ? " msof" : "",
(irqreg & INTR_SOF) ? " sof" : "",
(irqreg & INTR_RESUME) ? " resume" : "",
(irqreg & INTR_SUSPEND) ? " suspend" : "",
(irqreg & INTR_RESET_STOP) ? " noreset" : "",
(irqreg & INTR_RESET_START) ? " reset" : "",
(irqreg & INTR_FRAME_MATCH) ? " fmatch" : "",
(irqreg & INTR_CFG_CHG) ? " config" : "");
}
#else
#define dump_intr(x, y, z) do {} while (0)
#endif /* DEBUG_IRQ */
#ifdef DEBUG_EPIRQ
static void dump_ep_intr(const char *label, int nr, int irqreg,
struct device *dev)
{
dev_dbg(dev, "<%s> EP%d_INTR=[%s%s%s%s%s%s%s%s%s]\n", label, nr,
(irqreg & EPINTR_FIFO_FULL) ? " full" : "",
(irqreg & EPINTR_FIFO_EMPTY) ? " fempty" : "",
(irqreg & EPINTR_FIFO_ERROR) ? " ferr" : "",
(irqreg & EPINTR_FIFO_HIGH) ? " fhigh" : "",
(irqreg & EPINTR_FIFO_LOW) ? " flow" : "",
(irqreg & EPINTR_MDEVREQ) ? " mreq" : "",
(irqreg & EPINTR_EOF) ? " eof" : "",
(irqreg & EPINTR_DEVREQ) ? " devreq" : "",
(irqreg & EPINTR_EOT) ? " eot" : "");
}
#else
#define dump_ep_intr(x, y, z, i) do {} while (0)
#endif /* DEBUG_IRQ */
#ifdef DEBUG_DUMP
static void dump_usb_stat(const char *label,
struct imx_udc_struct *imx_usb)
{
int temp = __raw_readl(imx_usb->base + USB_STAT);
dev_dbg(imx_usb->dev,
"<%s> USB_STAT=[%s%s CFG=%d, INTF=%d, ALTR=%d]\n", label,
(temp & STAT_RST) ? " reset" : "",
(temp & STAT_SUSP) ? " suspend" : "",
(temp & STAT_CFG) >> 5,
(temp & STAT_INTF) >> 3,
(temp & STAT_ALTSET));
}
static void dump_ep_stat(const char *label,
struct imx_ep_struct *imx_ep)
{
int temp = __raw_readl(imx_ep->imx_usb->base
+ USB_EP_INTR(EP_NO(imx_ep)));
dev_dbg(imx_ep->imx_usb->dev,
"<%s> EP%d_INTR=[%s%s%s%s%s%s%s%s%s]\n",
label, EP_NO(imx_ep),
(temp & EPINTR_FIFO_FULL) ? " full" : "",
(temp & EPINTR_FIFO_EMPTY) ? " fempty" : "",
(temp & EPINTR_FIFO_ERROR) ? " ferr" : "",
(temp & EPINTR_FIFO_HIGH) ? " fhigh" : "",
(temp & EPINTR_FIFO_LOW) ? " flow" : "",
(temp & EPINTR_MDEVREQ) ? " mreq" : "",
(temp & EPINTR_EOF) ? " eof" : "",
(temp & EPINTR_DEVREQ) ? " devreq" : "",
(temp & EPINTR_EOT) ? " eot" : "");
temp = __raw_readl(imx_ep->imx_usb->base
+ USB_EP_STAT(EP_NO(imx_ep)));
dev_dbg(imx_ep->imx_usb->dev,
"<%s> EP%d_STAT=[%s%s bcount=%d]\n",
label, EP_NO(imx_ep),
(temp & EPSTAT_SIP) ? " sip" : "",
(temp & EPSTAT_STALL) ? " stall" : "",
(temp & EPSTAT_BCOUNT) >> 16);
temp = __raw_readl(imx_ep->imx_usb->base
+ USB_EP_FSTAT(EP_NO(imx_ep)));
dev_dbg(imx_ep->imx_usb->dev,
"<%s> EP%d_FSTAT=[%s%s%s%s%s%s%s]\n",
label, EP_NO(imx_ep),
(temp & FSTAT_ERR) ? " ferr" : "",
(temp & FSTAT_UF) ? " funder" : "",
(temp & FSTAT_OF) ? " fover" : "",
(temp & FSTAT_FR) ? " fready" : "",
(temp & FSTAT_FULL) ? " ffull" : "",
(temp & FSTAT_ALRM) ? " falarm" : "",
(temp & FSTAT_EMPTY) ? " fempty" : "");
}
static void dump_req(const char *label, struct imx_ep_struct *imx_ep,
struct usb_request *req)
{
int i;
if (!req || !req->buf) {
dev_dbg(imx_ep->imx_usb->dev,
"<%s> req or req buf is free\n", label);
return;
}
if ((!EP_NO(imx_ep) && imx_ep->imx_usb->ep0state
== EP0_IN_DATA_PHASE)
|| (EP_NO(imx_ep) && EP_DIR(imx_ep))) {
dev_dbg(imx_ep->imx_usb->dev,
"<%s> request dump <", label);
for (i = 0; i < req->length; i++)
printk("%02x-", *((u8 *)req->buf + i));
printk(">\n");
}
}
#else
#define dump_ep_stat(x, y) do {} while (0)
#define dump_usb_stat(x, y) do {} while (0)
#define dump_req(x, y, z) do {} while (0)
#endif /* DEBUG_DUMP */
#ifdef DEBUG_ERR
#define D_ERR(dev, args...) dev_dbg(dev, ## args)
#else
#define D_ERR(dev, args...) do {} while (0)
#endif
#else
#define D_REQ(dev, args...) do {} while (0)
#define D_TRX(dev, args...) do {} while (0)
#define D_INI(dev, args...) do {} while (0)
#define D_EP0(dev, args...) do {} while (0)
#define D_EPX(dev, args...) do {} while (0)
#define dump_ep_intr(x, y, z, i) do {} while (0)
#define dump_intr(x, y, z) do {} while (0)
#define dump_ep_stat(x, y) do {} while (0)
#define dump_usb_stat(x, y) do {} while (0)
#define dump_req(x, y, z) do {} while (0)
#define D_ERR(dev, args...) do {} while (0)
#endif /* DEBUG */
#endif /* __LINUX_USB_GADGET_IMX_H */
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