forked from Minki/linux
026b907d58
Interferences on the SPI line could distort the response of available buffer space. So at least we should check that the response doesn't exceed the maximum available buffer space. In error case increase a new error counter and retry it later. This behavior avoids buffer errors in the QCA7000, which results in an unnecessary chip reset including packet loss. Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: David S. Miller <davem@davemloft.net>
109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
/*
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* Copyright (c) 2011, 2012, Qualcomm Atheros Communications Inc.
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* Copyright (c) 2014, I2SE GmbH
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*
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* Permission to use, copy, modify, and/or distribute this software
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* for any purpose with or without fee is hereby granted, provided
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* that the above copyright notice and this permission notice appear
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* in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Qualcomm Atheros SPI register definition.
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*
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* This module is designed to define the Qualcomm Atheros SPI register
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* placeholders;
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*/
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#ifndef _QCA_SPI_H
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#define _QCA_SPI_H
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#include <linux/netdevice.h>
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#include <linux/sched.h>
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#include <linux/skbuff.h>
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#include <linux/spi/spi.h>
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#include <linux/types.h>
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#include "qca_7k_common.h"
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#define QCASPI_DRV_VERSION "0.2.7-i"
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#define QCASPI_DRV_NAME "qcaspi"
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#define QCASPI_GOOD_SIGNATURE 0xAA55
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#define TX_RING_MAX_LEN 10
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#define TX_RING_MIN_LEN 2
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/* sync related constants */
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#define QCASPI_SYNC_UNKNOWN 0
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#define QCASPI_SYNC_RESET 1
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#define QCASPI_SYNC_READY 2
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#define QCASPI_RESET_TIMEOUT 10
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/* sync events */
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#define QCASPI_EVENT_UPDATE 0
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#define QCASPI_EVENT_CPUON 1
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struct tx_ring {
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struct sk_buff *skb[TX_RING_MAX_LEN];
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u16 head;
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u16 tail;
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u16 size;
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u16 count;
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};
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struct qcaspi_stats {
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u64 trig_reset;
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u64 device_reset;
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u64 reset_timeout;
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u64 read_err;
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u64 write_err;
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u64 read_buf_err;
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u64 write_buf_err;
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u64 out_of_mem;
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u64 write_buf_miss;
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u64 ring_full;
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u64 spi_err;
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u64 write_verify_failed;
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u64 buf_avail_err;
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};
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struct qcaspi {
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struct net_device *net_dev;
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struct spi_device *spi_dev;
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struct task_struct *spi_thread;
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struct tx_ring txr;
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struct qcaspi_stats stats;
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u8 *rx_buffer;
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u32 buffer_size;
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u8 sync;
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struct qcafrm_handle frm_handle;
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struct sk_buff *rx_skb;
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unsigned int intr_req;
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unsigned int intr_svc;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *device_root;
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#endif
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/* user configurable options */
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u32 clkspeed;
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u8 legacy_mode;
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u16 burst_len;
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};
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#endif /* _QCA_SPI_H */
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