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>

drivers/serial/Kconfig

@@ -1632,4 +1632,10 @@ config SERIAL_ALTERA_UART_CONSOLE
 	help
 	  Enable a Altera UART port to be the system console.
 
+config SERIAL_IFX6X60
+        tristate "SPI protocol driver for Infineon 6x60 modem (EXPERIMENTAL)"
+	depends on GPIOLIB && EXPERIMENTAL
+	help
+	  Support for the IFX6x60 modem devices on Intel MID platforms.
+
 endmenu

drivers/serial/Makefile

@@ -89,3 +89,4 @@ obj-$(CONFIG_SERIAL_ALTERA_UART) += altera_uart.o
 obj-$(CONFIG_SERIAL_MRST_MAX3110)	+= mrst_max3110.o
 obj-$(CONFIG_SERIAL_MFD_HSU)	+= mfd.o
 obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
+obj-$(CONFIG_SERIAL_IFX6X60)  	+= ifx6x60.o

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 */

include/linux/spi/ifx_modem.h

@@ -0,0 +1,14 @@
+#ifndef LINUX_IFX_MODEM_H
+#define LINUX_IFX_MODEM_H
+
+struct ifx_modem_platform_data {
+	unsigned short rst_out; /* modem reset out */
+	unsigned short pwr_on;  /* power on */
+	unsigned short rst_pmu; /* reset modem */
+	unsigned short tx_pwr;  /* modem power threshold */
+	unsigned short srdy;    /* SRDY */
+	unsigned short mrdy;    /* MRDY */
+	unsigned short is_6160;	/* Modem type */
+};
+
+#endif