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>
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/****************************************************************************
|
|
*
|
|
* Driver for the IFX spi modem.
|
|
*
|
|
* Copyright (C) 2009, 2010 Intel Corp
|
|
* Jim Stanley <jim.stanley@intel.com>
|
|
*
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
|
|
* USA
|
|
*
|
|
*
|
|
*
|
|
*****************************************************************************/
|
|
#ifndef _IFX6X60_H
|
|
#define _IFX6X60_H
|
|
|
|
#define DRVNAME "ifx6x60"
|
|
#define TTYNAME "ttyIFX"
|
|
|
|
#define IFX_SPI_MAX_MINORS 1
|
|
#define IFX_SPI_TRANSFER_SIZE 2048
|
|
#define IFX_SPI_FIFO_SIZE 4096
|
|
|
|
#define IFX_SPI_HEADER_OVERHEAD 4
|
|
#define IFX_RESET_TIMEOUT msecs_to_jiffies(50)
|
|
|
|
/* device flags bitfield definitions */
|
|
#define IFX_SPI_STATE_PRESENT 0
|
|
#define IFX_SPI_STATE_IO_IN_PROGRESS 1
|
|
#define IFX_SPI_STATE_IO_READY 2
|
|
#define IFX_SPI_STATE_TIMER_PENDING 3
|
|
#define IFX_SPI_STATE_IO_AVAILABLE 4
|
|
|
|
/* flow control bitfields */
|
|
#define IFX_SPI_DCD 0
|
|
#define IFX_SPI_CTS 1
|
|
#define IFX_SPI_DSR 2
|
|
#define IFX_SPI_RI 3
|
|
#define IFX_SPI_DTR 4
|
|
#define IFX_SPI_RTS 5
|
|
#define IFX_SPI_TX_FC 6
|
|
#define IFX_SPI_RX_FC 7
|
|
#define IFX_SPI_UPDATE 8
|
|
|
|
#define IFX_SPI_PAYLOAD_SIZE (IFX_SPI_TRANSFER_SIZE - \
|
|
IFX_SPI_HEADER_OVERHEAD)
|
|
|
|
#define IFX_SPI_IRQ_TYPE DETECT_EDGE_RISING
|
|
#define IFX_SPI_GPIO_TARGET 0
|
|
#define IFX_SPI_GPIO0 0x105
|
|
|
|
#define IFX_SPI_STATUS_TIMEOUT (2000*HZ)
|
|
|
|
/* values for bits in power status byte */
|
|
#define IFX_SPI_POWER_DATA_PENDING 1
|
|
#define IFX_SPI_POWER_SRDY 2
|
|
|
|
struct ifx_spi_device {
|
|
/* Our SPI device */
|
|
struct spi_device *spi_dev;
|
|
|
|
/* Port specific data */
|
|
struct kfifo tx_fifo;
|
|
spinlock_t fifo_lock;
|
|
unsigned long signal_state;
|
|
|
|
/* TTY Layer logic */
|
|
struct tty_port tty_port;
|
|
struct device *tty_dev;
|
|
int minor;
|
|
|
|
/* Low level I/O work */
|
|
struct tasklet_struct io_work_tasklet;
|
|
unsigned long flags;
|
|
dma_addr_t rx_dma;
|
|
dma_addr_t tx_dma;
|
|
|
|
int modem; /* Modem type */
|
|
int use_dma; /* provide dma-able addrs in SPI msg */
|
|
long max_hz; /* max SPI frequency */
|
|
|
|
spinlock_t write_lock;
|
|
int write_pending;
|
|
spinlock_t power_lock;
|
|
unsigned char power_status;
|
|
|
|
unsigned char *rx_buffer;
|
|
unsigned char *tx_buffer;
|
|
dma_addr_t rx_bus;
|
|
dma_addr_t tx_bus;
|
|
unsigned char spi_more;
|
|
unsigned char spi_slave_cts;
|
|
|
|
struct timer_list spi_timer;
|
|
|
|
struct spi_message spi_msg;
|
|
struct spi_transfer spi_xfer;
|
|
|
|
struct {
|
|
/* gpio lines */
|
|
unsigned short srdy; /* slave-ready gpio */
|
|
unsigned short mrdy; /* master-ready gpio */
|
|
unsigned short reset; /* modem-reset gpio */
|
|
unsigned short po; /* modem-on gpio */
|
|
unsigned short reset_out; /* modem-in-reset gpio */
|
|
/* state/stats */
|
|
int unack_srdy_int_nb;
|
|
} gpio;
|
|
|
|
/* modem reset */
|
|
unsigned long mdm_reset_state;
|
|
#define MR_START 0
|
|
#define MR_INPROGRESS 1
|
|
#define MR_COMPLETE 2
|
|
wait_queue_head_t mdm_reset_wait;
|
|
void (*swap_buf)(unsigned char *buf, int len, void *end);
|
|
};
|
|
|
|
#endif /* _IFX6X60_H */
|