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1c4bdc01b8
Some of these workarounds are already in place, but labeled as affecting all BF52x parts. Since we have official anomaly numbers now, use those defines. And since writing to the FIFO has a similar hang issue as reading from the FIFO, implement the workaround there too when necessary. Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Cliff Cai <cliff.cai@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Cc: Felipe Balbi <felipe.balbi@nokia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/*
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* Copyright (C) 2007 by Analog Devices, Inc.
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*
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* The Inventra Controller Driver for Linux is free software; you
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* can redistribute it and/or modify it under the terms of the GNU
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* General Public License version 2 as published by the Free Software
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* Foundation.
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*/
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#ifndef __MUSB_BLACKFIN_H__
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#define __MUSB_BLACKFIN_H__
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/*
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* Blackfin specific definitions
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*/
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/* Anomalies notes:
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*
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* 05000450 - USB DMA Mode 1 Short Packet Data Corruption:
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* MUSB driver is designed to transfer buffer of N * maxpacket size
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* in DMA mode 1 and leave the rest of the data to the next
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* transfer in DMA mode 0, so we never transmit a short packet in
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* DMA mode 1.
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*
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* 05000463 - This anomaly doesn't affect this driver since it
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* never uses L1 or L2 memory as data destination.
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*
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* 05000464 - This anomaly doesn't affect this driver since it
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* never uses L1 or L2 memory as data source.
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*
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* 05000465 - The anomaly can be seen when SCLK is over 100 MHz, and there is
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* no way to workaround for bulk endpoints. Since the wMaxPackSize
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* of bulk is less than or equal to 512, while the fifo size of
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* endpoint 5, 6, 7 is 1024, the double buffer mode is enabled
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* automatically when these endpoints are used for bulk OUT.
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*
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* 05000466 - This anomaly doesn't affect this driver since it never mixes
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* concurrent DMA and core accesses to the TX endpoint FIFOs.
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*
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* 05000467 - The workaround for this anomaly will introduce another
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* anomaly - 05000465.
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*/
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/* The Mentor USB DMA engine on BF52x (silicon v0.0 and v0.1) seems to be
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* unstable in host mode. This may be caused by Anomaly 05000380. After
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* digging out the root cause, we will change this number accordingly.
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* So, need to either use silicon v0.2+ or disable DMA mode in MUSB.
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*/
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#if ANOMALY_05000380 && defined(CONFIG_BF52x) && \
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defined(CONFIG_USB_MUSB_HDRC) && !defined(CONFIG_MUSB_PIO_ONLY)
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# error "Please use PIO mode in MUSB driver on bf52x chip v0.0 and v0.1"
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#endif
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#undef DUMP_FIFO_DATA
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#ifdef DUMP_FIFO_DATA
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static void dump_fifo_data(u8 *buf, u16 len)
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{
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u8 *tmp = buf;
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int i;
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for (i = 0; i < len; i++) {
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if (!(i % 16) && i)
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pr_debug("\n");
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pr_debug("%02x ", *tmp++);
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}
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pr_debug("\n");
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}
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#else
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#define dump_fifo_data(buf, len) do {} while (0)
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#endif
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#define USB_DMA_BASE USB_DMA_INTERRUPT
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#define USB_DMAx_CTRL 0x04
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#define USB_DMAx_ADDR_LOW 0x08
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#define USB_DMAx_ADDR_HIGH 0x0C
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#define USB_DMAx_COUNT_LOW 0x10
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#define USB_DMAx_COUNT_HIGH 0x14
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#define USB_DMA_REG(ep, reg) (USB_DMA_BASE + 0x20 * ep + reg)
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/* Almost 1 second */
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#define TIMER_DELAY (1 * HZ)
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static struct timer_list musb_conn_timer;
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#endif /* __MUSB_BLACKFIN_H__ */
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