drivers/usb/musb/blackfin.h

   1 /*
   2  * Copyright (C) 2007 by Analog Devices, Inc.
   3  *
   4  * The Inventra Controller Driver for Linux is free software; you
   5  * can redistribute it and/or modify it under the terms of the GNU
   6  * General Public License version 2 as published by the Free Software
   7  * Foundation.
   8  */
   9
  10 #ifndef __MUSB_BLACKFIN_H__
  11 #define __MUSB_BLACKFIN_H__
  12
  13 /*
  14  * Blackfin specific definitions
  15  */
  16
  17 /* Anomalies notes:
  18  *
  19  *  05000450 - USB DMA Mode 1 Short Packet Data Corruption:
  20  *             MUSB driver is designed to transfer buffer of N * maxpacket size
  21  *             in DMA mode 1 and leave the rest of the data to the next
  22  *             transfer in DMA mode 0, so we never transmit a short packet in
  23  *             DMA mode 1.
  24  *
  25  *  05000463 - This anomaly doesn't affect this driver since it
  26  *             never uses L1 or L2 memory as data destination.
  27  *
  28  *  05000464 - This anomaly doesn't affect this driver since it
  29  *             never uses L1 or L2 memory as data source.
  30  *
  31  *  05000465 - The anomaly can be seen when SCLK is over 100 MHz, and there is
  32  *             no way to workaround for bulk endpoints.  Since the wMaxPackSize
  33  *             of bulk is less than or equal to 512, while the fifo size of
  34  *             endpoint 5, 6, 7 is 1024, the double buffer mode is enabled
  35  *             automatically when these endpoints are used for bulk OUT.
  36  *
  37  *  05000466 - This anomaly doesn't affect this driver since it never mixes
  38  *             concurrent DMA and core accesses to the TX endpoint FIFOs.
  39  *
  40  *  05000467 - The workaround for this anomaly will introduce another
  41  *             anomaly - 05000465.
  42  */
  43
  44 /* The Mentor USB DMA engine on BF52x (silicon v0.0 and v0.1) seems to be
  45  * unstable in host mode.  This may be caused by Anomaly 05000380.  After
  46  * digging out the root cause, we will change this number accordingly.
  47  * So, need to either use silicon v0.2+ or disable DMA mode in MUSB.
  48  */
  49 #if ANOMALY_05000380 && defined(CONFIG_BF52x) && \
  50     defined(CONFIG_USB_MUSB_HDRC) && !defined(CONFIG_MUSB_PIO_ONLY)
  51 # error "Please use PIO mode in MUSB driver on bf52x chip v0.0 and v0.1"
  52 #endif
  53
  54 #undef DUMP_FIFO_DATA
  55 #ifdef DUMP_FIFO_DATA
  56 static void dump_fifo_data(u8 *buf, u16 len)
  57 {
  58         u8 *tmp = buf;
  59         int i;
  60
  61         for (i = 0; i < len; i++) {
  62                 if (!(i % 16) && i)
  63                         pr_debug("\n");
  64                 pr_debug("%02x ", *tmp++);
  65         }
  66         pr_debug("\n");
  67 }
  68 #else
  69 #define dump_fifo_data(buf, len)        do {} while (0)
  70 #endif
  71
  72
  73 #define USB_DMA_BASE            USB_DMA_INTERRUPT
  74 #define USB_DMAx_CTRL           0x04
  75 #define USB_DMAx_ADDR_LOW       0x08
  76 #define USB_DMAx_ADDR_HIGH      0x0C
  77 #define USB_DMAx_COUNT_LOW      0x10
  78 #define USB_DMAx_COUNT_HIGH     0x14
  79
  80 #define USB_DMA_REG(ep, reg)    (USB_DMA_BASE + 0x20 * ep + reg)
  81
  82 /* Almost 1 second */
  83 #define TIMER_DELAY     (1 * HZ)
  84
  85 static struct timer_list musb_conn_timer;
  86
  87 #endif  /* __MUSB_BLACKFIN_H__ */