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https://github.com/edk2-porting/linux-next.git
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31fe990488
This patch is to implement following 2 places to avoid potential error when IFX6x60 port shutdown: 1) Clear Flag IFX_SPI_STATE_IO_AVAILABLE to disable data transfer when Modem port is shutdown; 2) Clear Flag IFX_SPI_STATE_IO_IN_PROGRESS and IFX_SPI_STATE_IO_READY when reopen port. This is because last port shutdown may happen when SPI/DMA transfer is in progress, if the last data transfer is not completed(for example due to modem reset), the Flag IFX_SPI_STATE_IO_IN_PROGRESS will be set forever, so when IFX port is activated again, IFX_SPI_STATE_IO_IN_PROGRESS will prevent transferring data forever. And if don't clear IFX_SPI_STATE_IO_READY, it may cause one more SPI frame transferring in spit there is not data need to be transfer. cc: liu chuansheng <chuansheng.liu@intel.com> cc: Chen Jun <jun.d.chen@intel.com> Signed-off-by: channing <chao.bi@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/****************************************************************************
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*
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* Driver for the IFX spi modem.
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*
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* Copyright (C) 2009, 2010 Intel Corp
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* Jim Stanley <jim.stanley@intel.com>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA
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*
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*
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*
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*****************************************************************************/
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#ifndef _IFX6X60_H
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#define _IFX6X60_H
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#define DRVNAME "ifx6x60"
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#define TTYNAME "ttyIFX"
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#define IFX_SPI_MAX_MINORS 1
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#define IFX_SPI_TRANSFER_SIZE 2048
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#define IFX_SPI_FIFO_SIZE 4096
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#define IFX_SPI_HEADER_OVERHEAD 4
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#define IFX_RESET_TIMEOUT msecs_to_jiffies(50)
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/* device flags bitfield definitions */
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#define IFX_SPI_STATE_PRESENT 0
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#define IFX_SPI_STATE_IO_IN_PROGRESS 1
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#define IFX_SPI_STATE_IO_READY 2
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#define IFX_SPI_STATE_TIMER_PENDING 3
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#define IFX_SPI_STATE_IO_AVAILABLE 4
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/* flow control bitfields */
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#define IFX_SPI_DCD 0
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#define IFX_SPI_CTS 1
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#define IFX_SPI_DSR 2
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#define IFX_SPI_RI 3
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#define IFX_SPI_DTR 4
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#define IFX_SPI_RTS 5
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#define IFX_SPI_TX_FC 6
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#define IFX_SPI_RX_FC 7
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#define IFX_SPI_UPDATE 8
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#define IFX_SPI_PAYLOAD_SIZE (IFX_SPI_TRANSFER_SIZE - \
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IFX_SPI_HEADER_OVERHEAD)
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#define IFX_SPI_IRQ_TYPE DETECT_EDGE_RISING
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#define IFX_SPI_GPIO_TARGET 0
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#define IFX_SPI_GPIO0 0x105
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#define IFX_SPI_STATUS_TIMEOUT (2000*HZ)
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/* values for bits in power status byte */
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#define IFX_SPI_POWER_DATA_PENDING 1
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#define IFX_SPI_POWER_SRDY 2
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struct ifx_spi_device {
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/* Our SPI device */
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struct spi_device *spi_dev;
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/* Port specific data */
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struct kfifo tx_fifo;
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spinlock_t fifo_lock;
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unsigned long signal_state;
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/* TTY Layer logic */
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struct tty_port tty_port;
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struct device *tty_dev;
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int minor;
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/* Low level I/O work */
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struct tasklet_struct io_work_tasklet;
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unsigned long flags;
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dma_addr_t rx_dma;
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dma_addr_t tx_dma;
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int modem; /* Modem type */
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int use_dma; /* provide dma-able addrs in SPI msg */
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long max_hz; /* max SPI frequency */
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spinlock_t write_lock;
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int write_pending;
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spinlock_t power_lock;
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unsigned char power_status;
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unsigned char *rx_buffer;
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unsigned char *tx_buffer;
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dma_addr_t rx_bus;
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dma_addr_t tx_bus;
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unsigned char spi_more;
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unsigned char spi_slave_cts;
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struct timer_list spi_timer;
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struct spi_message spi_msg;
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struct spi_transfer spi_xfer;
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struct {
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/* gpio lines */
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unsigned short srdy; /* slave-ready gpio */
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unsigned short mrdy; /* master-ready gpio */
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unsigned short reset; /* modem-reset gpio */
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unsigned short po; /* modem-on gpio */
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unsigned short reset_out; /* modem-in-reset gpio */
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/* state/stats */
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int unack_srdy_int_nb;
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} gpio;
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/* modem reset */
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unsigned long mdm_reset_state;
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#define MR_START 0
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#define MR_INPROGRESS 1
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#define MR_COMPLETE 2
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wait_queue_head_t mdm_reset_wait;
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void (*swap_buf)(unsigned char *buf, int len, void *end);
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};
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#endif /* _IFX6X60_H */
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