ifx6x60: SPI protocol driver for Infineon 6x60 modem

Prototype driver for the IFX6x60 series of SPI attached modems by Jim
Stanley and Russ Gorby

Signed-off-by: Russ Gorby <richardx.r.gorby@intel.com>

[Some reworking and a major cleanup]

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 129 insertions, 0 deletions

diff --git a/drivers/serial/ifx6x60.h b/drivers/serial/ifx6x60.h
new file mode 100644
index 000000000000..deb7b8d977dc
--- /dev/null
+++ b/drivers/serial/ifx6x60.h
@@ -0,0 +1,129 @@
+/****************************************************************************
+ *
+ * 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_THROTTLE_CODE */
+
+#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
+
+/* 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 is_6160;                            /* Modem type */
+
+        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;
+};
+
+#endif /* _IFX6X60_H */