Re: [PATCH 012/196 ver2] nozomi driver

[Frank Seidel]

From: Frank Seidel <fseidel@xxxxxxx>

This is a driver to control the cardbus wireless data card that works on
3g networks.

Greg Kroah-Hartman <gregkh@xxxxxxx> did the initial driver cleanup.
Thanks to Arnaud Patard <apatard@xxxxxxxxxxxx> for help with bugfixing.
Thanks to Alan Cox for a lot of tty fixes.
Thanks to Satyam Sharma <satyam@xxxxxxxxxxxxx> for fixing buildbreakage.
Thanks to Frank Seidel <fseidel@xxxxxxx> for a lot of bugfixes and
rewriting to make it a sane Linux driver
Thanks to Jiri Slaby <jirislaby@xxxxxxxxx> for a lot bugfixes, cleanups
and rewrites that make it much more readable.

Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Frank Seidel <fseidel@xxxxxxx>
Signed-off-by: Jiri Slaby <jirislaby@xxxxxxxxx>
---
 drivers/char/Kconfig  |   10 
 drivers/char/Makefile |    1 
 drivers/char/nozomi.c | 1943 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1954 insertions(+)

--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -373,6 +373,16 @@ config ISTALLION
 	  To compile this driver as a module, choose M here: the
 	  module will be called istallion.
 
+config NOZOMI
+	tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
+	depends on PCI && EXPERIMENTAL
+	help
+	  If you have a HSDPA driver Broadband Wireless Data Card -
+	  Globe Trotter PCMCIA card, say Y here.
+
+	  To compile this driver as a module, choose M here, the module
+	  will be called nozomi.
+
 config A2232
 	tristate "Commodore A2232 serial support (EXPERIMENTAL)"
 	depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_SERIAL167)		+= serial167.o
 obj-$(CONFIG_CYCLADES)		+= cyclades.o
 obj-$(CONFIG_STALLION)		+= stallion.o
 obj-$(CONFIG_ISTALLION)		+= istallion.o
+obj-$(CONFIG_NOZOMI)		+= nozomi.o
 obj-$(CONFIG_DIGIEPCA)		+= epca.o
 obj-$(CONFIG_SPECIALIX)		+= specialix.o
 obj-$(CONFIG_MOXA_INTELLIO)	+= moxa.o
--- /dev/null
+++ b/drivers/char/nozomi.c
@@ -0,0 +1,1943 @@
+/*
+ * nozomi.c  -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
+ *
+ * Written by: Ulf Jakobsson,
+ *             Jan Ãkerfeldt,
+ *             Stefan Thomasson,
+ *
+ * Maintained by: Paul Hardwick (p.hardwick@xxxxxxxxxx)
+ *
+ * Patches:
+ *          Locking code changes for Vodafone by Sphere Systems Ltd,
+ *                              Andrew Bird (ajb@xxxxxxxxxxxxxxxxxxx )
+ *                              & Phil Sanderson
+ *
+ * Source has been ported from an implementation made by Filip Aben @ Option
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Copyright (c) 2005,2006 Option Wireless Sweden AB
+ * Copyright (c) 2006 Sphere Systems Ltd
+ * Copyright (c) 2006 Option Wireless n/v
+ * All rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * --------------------------------------------------------------------------
+ */
+
+/* Enable this to have a lot of debug printouts */
+#define DEBUG
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/interrupt.h>
+#include <linux/kmod.h>
+#include <linux/init.h>
+#include <linux/kfifo.h>
+#include <linux/uaccess.h>
+#include <asm/byteorder.h>
+
+#include <linux/delay.h>
+
+
+#define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
+					__DATE__ " " __TIME__ ")"
+
+/*    Macros definitions */
+
+/* Default debug printout level */
+#define NOZOMI_DEBUG_LEVEL 0x00
+
+#define P_BUF_SIZE 128
+#define NFO(_err_flag_, args...)				\
+do {								\
+	char tmp[P_BUF_SIZE];					\
+	snprintf(tmp, sizeof(tmp), ##args);			\
+	printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,		\
+		__FUNCTION__, tmp);				\
+} while (0)
+
+#define DBG1(args...) D_(0x01, ##args)
+#define DBG2(args...) D_(0x02, ##args)
+#define DBG3(args...) D_(0x04, ##args)
+#define DBG4(args...) D_(0x08, ##args)
+#define DBG5(args...) D_(0x10, ##args)
+#define DBG6(args...) D_(0x20, ##args)
+#define DBG7(args...) D_(0x40, ##args)
+#define DBG8(args...) D_(0x80, ##args)
+
+#ifdef DEBUG
+/* Do we need this settable at runtime? */
+static int debug = NOZOMI_DEBUG_LEVEL;
+
+#define D(lvl, args...)  do \
+			{if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
+			while (0)
+#define D_(lvl, args...) D(lvl, ##args)
+
+/* These printouts are always printed */
+
+#else
+static int debug;
+#define D_(lvl, args...)
+#endif
+
+/* TODO: rewrite to optimize macros... */
+
+#define TMP_BUF_MAX 256
+
+#define DUMP(buf__,len__) \
+  do {  \
+    char tbuf[TMP_BUF_MAX] = {0};\
+    if (len__ > 1) {\
+	snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
+	if (tbuf[len__-2] == '\r') {\
+		tbuf[len__-2] = 'r';\
+	} \
+	DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
+    } else {\
+	DBG1("SENDING: '%s' (%d)", tbuf, len__);\
+    } \
+} while (0)
+
+/*    Defines */
+#define NOZOMI_NAME		"nozomi"
+#define NOZOMI_NAME_TTY		"nozomi_tty"
+#define DRIVER_DESC		"Nozomi driver"
+
+#define NTTY_TTY_MAXMINORS	256
+#define NTTY_FIFO_BUFFER_SIZE	8192
+
+/* Must be power of 2 */
+#define FIFO_BUFFER_SIZE_UL	8192
+
+/* Size of tmp send buffer to card */
+#define SEND_BUF_MAX		1024
+#define RECEIVE_BUF_MAX		4
+
+
+/* Define all types of vendors and devices to support */
+#define VENDOR1		0x1931	/* Vendor Option */
+#define DEVICE1		0x000c	/* HSDPA card */
+
+#define R_IIR		0x0000	/* Interrupt Identity Register */
+#define R_FCR		0x0000	/* Flow Control Register */
+#define R_IER		0x0004	/* Interrupt Enable Register */
+
+#define CONFIG_MAGIC	0xEFEFFEFE
+#define TOGGLE_VALID	0x0000
+
+/* Definition of interrupt tokens */
+#define MDM_DL1		0x0001
+#define MDM_UL1		0x0002
+#define MDM_DL2		0x0004
+#define MDM_UL2		0x0008
+#define DIAG_DL1	0x0010
+#define DIAG_DL2	0x0020
+#define DIAG_UL		0x0040
+#define APP1_DL		0x0080
+#define APP1_UL		0x0100
+#define APP2_DL		0x0200
+#define APP2_UL		0x0400
+#define CTRL_DL		0x0800
+#define CTRL_UL		0x1000
+#define RESET		0x8000
+
+#define MDM_DL		(MDM_DL1  | MDM_DL2)
+#define MDM_UL		(MDM_UL1  | MDM_UL2)
+#define DIAG_DL		(DIAG_DL1 | DIAG_DL2)
+
+/* modem signal definition */
+#define CTRL_DSR	0x0001
+#define CTRL_DCD	0x0002
+#define CTRL_RI		0x0004
+#define CTRL_CTS	0x0008
+
+#define CTRL_DTR	0x0001
+#define CTRL_RTS	0x0002
+
+#define MAX_PORT		4
+#define NOZOMI_MAX_PORTS	5
+#define NOZOMI_MAX_CARDS	(NTTY_TTY_MAXMINORS / MAX_PORT)
+
+/*    Type definitions */
+
+/*
+ * There are two types of nozomi cards,
+ * one with 2048 memory and with 8192 memory
+ */
+enum card_type {
+	F32_2 = 2048,	/* 512 bytes downlink + uplink * 2 -> 2048 */
+	F32_8 = 8192,	/* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
+};
+
+/* Two different toggle channels exist */
+enum channel_type {
+	CH_A = 0,
+	CH_B = 1,
+};
+
+/* Port definition for the card regarding flow control */
+enum ctrl_port_type {
+	CTRL_CMD	= 0,
+	CTRL_MDM	= 1,
+	CTRL_DIAG	= 2,
+	CTRL_APP1	= 3,
+	CTRL_APP2	= 4,
+	CTRL_ERROR	= -1,
+};
+
+/* Ports that the nozomi has */
+enum port_type {
+	PORT_MDM	= 0,
+	PORT_DIAG	= 1,
+	PORT_APP1	= 2,
+	PORT_APP2	= 3,
+	PORT_CTRL	= 4,
+	PORT_ERROR	= -1,
+};
+
+#ifdef __BIG_ENDIAN
+/* Big endian */
+
+struct toggles {
+	unsigned int enabled:5;	/*
+				 * Toggle fields are valid if enabled is 0,
+				 * else A-channels must always be used.
+				 */
+	unsigned int diag_dl:1;
+	unsigned int mdm_dl:1;
+	unsigned int mdm_ul:1;
+} __attribute__ ((packed));
+
+/* Configuration table to read at startup of card */
+/* Is for now only needed during initialization phase */
+struct config_table {
+	u32 signature;
+	u16 product_information;
+	u16 version;
+	u8 pad3[3];
+	struct toggles toggle;
+	u8 pad1[4];
+	u16 dl_mdm_len1;	/*
+				 * If this is 64, it can hold
+				 * 60 bytes + 4 that is length field
+				 */
+	u16 dl_start;
+
+	u16 dl_diag_len1;
+	u16 dl_mdm_len2;	/*
+				 * If this is 64, it can hold
+				 * 60 bytes + 4 that is length field
+				 */
+	u16 dl_app1_len;
+
+	u16 dl_diag_len2;
+	u16 dl_ctrl_len;
+	u16 dl_app2_len;
+	u8 pad2[16];
+	u16 ul_mdm_len1;
+	u16 ul_start;
+	u16 ul_diag_len;
+	u16 ul_mdm_len2;
+	u16 ul_app1_len;
+	u16 ul_app2_len;
+	u16 ul_ctrl_len;
+} __attribute__ ((packed));
+
+/* This stores all control downlink flags */
+struct ctrl_dl {
+	u8 port;
+	unsigned int reserved:4;
+	unsigned int CTS:1;
+	unsigned int RI:1;
+	unsigned int DCD:1;
+	unsigned int DSR:1;
+} __attribute__ ((packed));
+
+/* This stores all control uplink flags */
+struct ctrl_ul {
+	u8 port;
+	unsigned int reserved:6;
+	unsigned int RTS:1;
+	unsigned int DTR:1;
+} __attribute__ ((packed));
+
+#else
+/* Little endian */
+
+/* This represents the toggle information */
+struct toggles {
+	unsigned int mdm_ul:1;
+	unsigned int mdm_dl:1;
+	unsigned int diag_dl:1;
+	unsigned int enabled:5;	/*
+				 * Toggle fields are valid if enabled is 0,
+				 * else A-channels must always be used.
+				 */
+} __attribute__ ((packed));
+
+/* Configuration table to read at startup of card */
+struct config_table {
+	u32 signature;
+	u16 version;
+	u16 product_information;
+	struct toggles toggle;
+	u8 pad1[7];
+	u16 dl_start;
+	u16 dl_mdm_len1;	/*
+				 * If this is 64, it can hold
+				 * 60 bytes + 4 that is length field
+				 */
+	u16 dl_mdm_len2;
+	u16 dl_diag_len1;
+	u16 dl_diag_len2;
+	u16 dl_app1_len;
+	u16 dl_app2_len;
+	u16 dl_ctrl_len;
+	u8 pad2[16];
+	u16 ul_start;
+	u16 ul_mdm_len2;
+	u16 ul_mdm_len1;
+	u16 ul_diag_len;
+	u16 ul_app1_len;
+	u16 ul_app2_len;
+	u16 ul_ctrl_len;
+} __attribute__ ((packed));
+
+/* This stores all control downlink flags */
+struct ctrl_dl {
+	unsigned int DSR:1;
+	unsigned int DCD:1;
+	unsigned int RI:1;
+	unsigned int CTS:1;
+	unsigned int reserverd:4;
+	u8 port;
+} __attribute__ ((packed));
+
+/* This stores all control uplink flags */
+struct ctrl_ul {
+	unsigned int DTR:1;
+	unsigned int RTS:1;
+	unsigned int reserved:6;
+	u8 port;
+} __attribute__ ((packed));
+#endif
+
+/* This holds all information that is needed regarding a port */
+struct port {
+	u8 update_flow_control;
+	struct ctrl_ul ctrl_ul;
+	struct ctrl_dl ctrl_dl;
+	struct kfifo *fifo_ul;
+	void __iomem *dl_addr[2];
+	u32 dl_size[2];
+	u8 toggle_dl;
+	void __iomem *ul_addr[2];
+	u32 ul_size[2];
+	u8 toggle_ul;
+	u16 token_dl;
+
+	struct tty_struct *tty;
+	int tty_open_count;
+	/* mutex to ensure one access patch to this port */
+	struct mutex tty_sem;
+	wait_queue_head_t tty_wait;
+	struct async_icount tty_icount;
+};
+
+/* Private data one for each card in the system */
+struct nozomi {
+	void __iomem *base_addr;
+	unsigned long flip;
+
+	/* Pointers to registers */
+	void __iomem *reg_iir;
+	void __iomem *reg_fcr;
+	void __iomem *reg_ier;
+
+	u16 last_ier;
+	enum card_type card_type;
+	struct config_table config_table;	/* Configuration table */
+	struct pci_dev *pdev;
+	struct port port[NOZOMI_MAX_PORTS];
+	u8 *send_buf;
+
+	spinlock_t spin_mutex;	/* secures access to registers and tty */
+
+	unsigned int index_start;
+	u32 open_ttys;
+};
+
+/* This is a data packet that is read or written to/from card */
+struct buffer {
+	u32 size;		/* size is the length of the data buffer */
+	u8 *data;
+} __attribute__ ((packed));
+
+/*    Global variables */
+static struct pci_device_id nozomi_pci_tbl[] = {
+	{PCI_DEVICE(VENDOR1, DEVICE1)},
+	{},
+};
+
+MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
+
+static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
+static struct tty_driver *ntty_driver;
+
+/*
+ * find card by tty_index
+ */
+static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
+{
+	return tty ? ndevs[tty->index / MAX_PORT] : NULL;
+}
+
+static inline struct port *get_port_by_tty(const struct tty_struct *tty)
+{
+	struct nozomi *ndev = get_dc_by_tty(tty);
+	return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
+}
+
+/*
+ * TODO:
+ * -Optimize
+ * -Rewrite cleaner
+ */
+
+static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
+			u32 size_bytes)
+{
+	u32 i = 0;
+	const u32 *ptr = (__force u32 *) mem_addr_start;
+	u16 *buf16;
+
+	if (unlikely(!ptr || !buf))
+		goto out;
+
+	/* shortcut for extremely often used cases */
+	switch (size_bytes) {
+	case 2:	/* 2 bytes */
+		buf16 = (u16 *) buf;
+		*buf16 = __le16_to_cpu(readw((void __iomem *)ptr));
+		goto out;
+		break;
+	case 4:	/* 4 bytes */
+		*(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
+		goto out;
+		break;
+	}
+
+	while (i < size_bytes) {
+		if (size_bytes - i == 2) {
+			/* Handle 2 bytes in the end */
+			buf16 = (u16 *) buf;
+			*(buf16) = __le16_to_cpu(readw((void __iomem *)ptr));
+			i += 2;
+		} else {
+			/* Read 4 bytes */
+			*(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
+			i += 4;
+		}
+		buf++;
+		ptr++;
+	}
+out:
+	return;
+}
+
+/*
+ * TODO:
+ * -Optimize
+ * -Rewrite cleaner
+ */
+static u32 write_mem32(void __iomem *mem_addr_start, u32 *buf,
+			u32 size_bytes)
+{
+	u32 i = 0;
+	u32 *ptr = (__force u32 *) mem_addr_start;
+	u16 *buf16;
+
+	if (unlikely(!ptr || !buf))
+		return 0;
+
+	/* shortcut for extremely often used cases */
+	switch (size_bytes) {
+	case 2:	/* 2 bytes */
+		buf16 = (u16 *) buf;
+		writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
+		return 2;
+		break;
+	case 1: /*
+		 * also needs to write 4 bytes in this case
+		 * so falling through..
+		 */
+	case 4: /* 4 bytes */
+		writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
+		return 4;
+		break;
+	}
+
+	while (i < size_bytes) {
+		if (size_bytes - i == 2) {
+			/* 2 bytes */
+			buf16 = (u16 *) buf;
+			writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
+			i += 2;
+		} else {
+			/* 4 bytes */
+			writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
+			i += 4;
+		}
+		buf++;
+		ptr++;
+	}
+	return i;
+}
+
+/* Setup pointers to different channels and also setup buffer sizes. */
+static void setup_memory(struct nozomi *dc)
+{
+	void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
+	/* The length reported is including the length field of 4 bytes,
+	 * hence subtract with 4.
+	 */
+	const u16 buff_offset = 4;
+
+	/* Modem port dl configuration */
+	dc->port[PORT_MDM].dl_addr[CH_A] = offset;
+	dc->port[PORT_MDM].dl_addr[CH_B] =
+				(offset += dc->config_table.dl_mdm_len1);
+	dc->port[PORT_MDM].dl_size[CH_A] =
+				dc->config_table.dl_mdm_len1 - buff_offset;
+	dc->port[PORT_MDM].dl_size[CH_B] =
+				dc->config_table.dl_mdm_len2 - buff_offset;
+
+	/* Diag port dl configuration */
+	dc->port[PORT_DIAG].dl_addr[CH_A] =
+				(offset += dc->config_table.dl_mdm_len2);
+	dc->port[PORT_DIAG].dl_size[CH_A] =
+				dc->config_table.dl_diag_len1 - buff_offset;
+	dc->port[PORT_DIAG].dl_addr[CH_B] =
+				(offset += dc->config_table.dl_diag_len1);
+	dc->port[PORT_DIAG].dl_size[CH_B] =
+				dc->config_table.dl_diag_len2 - buff_offset;
+
+	/* App1 port dl configuration */
+	dc->port[PORT_APP1].dl_addr[CH_A] =
+				(offset += dc->config_table.dl_diag_len2);
+	dc->port[PORT_APP1].dl_size[CH_A] =
+				dc->config_table.dl_app1_len - buff_offset;
+
+	/* App2 port dl configuration */
+	dc->port[PORT_APP2].dl_addr[CH_A] =
+				(offset += dc->config_table.dl_app1_len);
+	dc->port[PORT_APP2].dl_size[CH_A] =
+				dc->config_table.dl_app2_len - buff_offset;
+
+	/* Ctrl dl configuration */
+	dc->port[PORT_CTRL].dl_addr[CH_A] =
+				(offset += dc->config_table.dl_app2_len);
+	dc->port[PORT_CTRL].dl_size[CH_A] =
+				dc->config_table.dl_ctrl_len - buff_offset;
+
+	offset = dc->base_addr + dc->config_table.ul_start;
+
+	/* Modem Port ul configuration */
+	dc->port[PORT_MDM].ul_addr[CH_A] = offset;
+	dc->port[PORT_MDM].ul_size[CH_A] =
+				dc->config_table.ul_mdm_len1 - buff_offset;
+	dc->port[PORT_MDM].ul_addr[CH_B] =
+				(offset += dc->config_table.ul_mdm_len1);
+	dc->port[PORT_MDM].ul_size[CH_B] =
+				dc->config_table.ul_mdm_len2 - buff_offset;
+
+	/* Diag port ul configuration */
+	dc->port[PORT_DIAG].ul_addr[CH_A] =
+				(offset += dc->config_table.ul_mdm_len2);
+	dc->port[PORT_DIAG].ul_size[CH_A] =
+				dc->config_table.ul_diag_len - buff_offset;
+
+	/* App1 port ul configuration */
+	dc->port[PORT_APP1].ul_addr[CH_A] =
+				(offset += dc->config_table.ul_diag_len);
+	dc->port[PORT_APP1].ul_size[CH_A] =
+				dc->config_table.ul_app1_len - buff_offset;
+
+	/* App2 port ul configuration */
+	dc->port[PORT_APP2].ul_addr[CH_A] =
+				(offset += dc->config_table.ul_app1_len);
+	dc->port[PORT_APP2].ul_size[CH_A] =
+				dc->config_table.ul_app2_len - buff_offset;
+
+	/* Ctrl ul configuration */
+	dc->port[PORT_CTRL].ul_addr[CH_A] =
+				(offset += dc->config_table.ul_app2_len);
+	dc->port[PORT_CTRL].ul_size[CH_A] =
+				dc->config_table.ul_ctrl_len - buff_offset;
+}
+
+/* Dump config table under initalization phase */
+#ifdef DEBUG
+static void dump_table(const struct nozomi *dc)
+{
+	DBG3("signature: 0x%08X", dc->config_table.signature);
+	DBG3("version: 0x%04X", dc->config_table.version);
+	DBG3("product_information: 0x%04X", \
+				dc->config_table.product_information);
+	DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
+	DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
+	DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
+	DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
+
+	DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
+	DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
+	   dc->config_table.dl_mdm_len1);
+	DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
+	   dc->config_table.dl_mdm_len2);
+	DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
+	   dc->config_table.dl_diag_len1);
+	DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
+	   dc->config_table.dl_diag_len2);
+	DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
+	   dc->config_table.dl_app1_len);
+	DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
+	   dc->config_table.dl_app2_len);
+	DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
+	   dc->config_table.dl_ctrl_len);
+	DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
+	   dc->config_table.ul_start);
+	DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
+	   dc->config_table.ul_mdm_len1);
+	DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
+	   dc->config_table.ul_mdm_len2);
+	DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
+	   dc->config_table.ul_diag_len);
+	DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
+	   dc->config_table.ul_app1_len);
+	DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
+	   dc->config_table.ul_app2_len);
+	DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
+	   dc->config_table.ul_ctrl_len);
+}
+#else
+static inline void dump_table(const struct nozomi *dc) { }
+#endif
+
+/*
+ * Read configuration table from card under intalization phase
+ * Returns 1 if ok, else 0
+ */
+static int nozomi_read_config_table(struct nozomi *dc)
+{
+	read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
+						sizeof(struct config_table));
+
+	if (dc->config_table.signature != CONFIG_MAGIC) {
+		dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
+			dc->config_table.signature, CONFIG_MAGIC);
+		return 0;
+	}
+
+	if ((dc->config_table.version == 0)
+	    || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
+		int i;
+		DBG1("Second phase, configuring card");
+
+		setup_memory(dc);
+
+		dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
+		dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
+		dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
+		DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
+		   dc->port[PORT_MDM].toggle_ul,
+		   dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
+
+		dump_table(dc);
+
+		for (i = PORT_MDM; i < MAX_PORT; i++) {
+			dc->port[i].fifo_ul =
+			    kfifo_alloc(FIFO_BUFFER_SIZE_UL, GFP_ATOMIC, NULL);
+			memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
+			memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
+		}
+
+		/* Enable control channel */
+		dc->last_ier = dc->last_ier | CTRL_DL;
+		writew(dc->last_ier, dc->reg_ier);
+
+		dev_info(&dc->pdev->dev, "Initialization OK!\n");
+		return 1;
+	}
+
+	if ((dc->config_table.version > 0)
+	    && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
+		u32 offset = 0;
+		DBG1("First phase: pushing upload buffers, clearing download");
+
+		dev_info(&dc->pdev->dev, "Version of card: %d\n",
+			 dc->config_table.version);
+
+		/* Here we should disable all I/O over F32. */
+		setup_memory(dc);
+
+		/*
+		 * We should send ALL channel pair tokens back along
+		 * with reset token
+		 */
+
+		/* push upload modem buffers */
+		write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
+			(u32 *) &offset, 4);
+		write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
+			(u32 *) &offset, 4);
+
+		writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
+
+		DBG1("First phase done");
+	}
+
+	return 1;
+}
+
+/* Enable uplink interrupts  */
+static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
+{
+	u16 mask[NOZOMI_MAX_PORTS] = \
+			{MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
+
+	if (port < NOZOMI_MAX_PORTS) {
+		dc->last_ier |= mask[port];
+		writew(dc->last_ier, dc->reg_ier);
+	} else {
+		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
+	}
+}
+
+/* Disable uplink interrupts  */
+static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
+{
+	u16 mask[NOZOMI_MAX_PORTS] = \
+			{~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
+
+	if (port < NOZOMI_MAX_PORTS) {
+		dc->last_ier &= mask[port];
+		writew(dc->last_ier, dc->reg_ier);
+	} else {
+		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
+	}
+}
+
+/* Enable downlink interrupts */
+static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
+{
+	u16 mask[NOZOMI_MAX_PORTS] = \
+			{MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
+
+	if (port < NOZOMI_MAX_PORTS) {
+		dc->last_ier |= mask[port];
+		writew(dc->last_ier, dc->reg_ier);
+	} else {
+		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
+	}
+}
+
+/* Disable downlink interrupts */
+static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
+{
+	u16 mask[NOZOMI_MAX_PORTS] = \
+			{~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
+
+	if (port < NOZOMI_MAX_PORTS) {
+		dc->last_ier &= mask[port];
+		writew(dc->last_ier, dc->reg_ier);
+	} else {
+		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
+	}
+}
+
+/*
+ * Return 1 - send buffer to card and ack.
+ * Return 0 - don't ack, don't send buffer to card.
+ */
+static int send_data(enum port_type index, struct nozomi *dc)
+{
+	u32 size = 0;
+	struct port *port = &dc->port[index];
+	u8 toggle = port->toggle_ul;
+	void __iomem *addr = port->ul_addr[toggle];
+	u32 ul_size = port->ul_size[toggle];
+	struct tty_struct *tty = port->tty;
+
+	/* Get data from tty and place in buf for now */
+	size = __kfifo_get(port->fifo_ul, dc->send_buf,
+			   ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
+
+	if (size == 0) {
+		DBG4("No more data to send, disable link:");
+		return 0;
+	}
+
+	/* DUMP(buf, size); */
+
+	/* Write length + data */
+	write_mem32(addr, (u32 *) &size, 4);
+	write_mem32(addr + 4, (u32 *) dc->send_buf, size);
+
+	if (tty)
+		tty_wakeup(tty);
+
+	return 1;
+}
+
+/* If all data has been read, return 1, else 0 */
+static int receive_data(enum port_type index, struct nozomi *dc)
+{
+	u8 buf[RECEIVE_BUF_MAX] = { 0 };
+	int size;
+	u32 offset = 4;
+	struct port *port = &dc->port[index];
+	void __iomem *addr = port->dl_addr[port->toggle_dl];
+	struct tty_struct *tty = port->tty;
+	int i;
+
+	if (unlikely(!tty)) {
+		DBG1("tty not open for port: %d?", index);
+		return 1;
+	}
+
+	read_mem32((u32 *) &size, addr, 4);
+	/*  DBG1( "%d bytes port: %d", size, index); */
+
+	if (test_bit(TTY_THROTTLED, &tty->flags)) {
+		DBG1("No room in tty, don't read data, don't ack interrupt, "
+			"disable interrupt");
+
+		/* disable interrupt in downlink... */
+		disable_transmit_dl(index, dc);
+		return 0;
+	}
+
+	if (unlikely(size == 0)) {
+		dev_err(&dc->pdev->dev, "size == 0?\n");
+		return 1;
+	}
+
+	tty_buffer_request_room(tty, size);
+
+	while (size > 0) {
+		read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
+
+		if (size == 1) {
+			tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
+			size = 0;
+		} else if (size < RECEIVE_BUF_MAX) {
+			size -= tty_insert_flip_string(tty, (char *) buf, size);
+		} else {
+			i = tty_insert_flip_string(tty, \
+						(char *) buf, RECEIVE_BUF_MAX);
+			size -= i;
+			offset += i;
+		}
+	}
+
+	set_bit(index, &dc->flip);
+
+	return 1;
+}
+
+/* Debug for interrupts */
+#ifdef DEBUG
+static char *interrupt2str(u16 interrupt)
+{
+	static char buf[TMP_BUF_MAX];
+	char *p = buf;
+
+	interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
+	interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"MDM_DL2 ") : NULL;
+
+	interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"MDM_UL1 ") : NULL;
+	interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"MDM_UL2 ") : NULL;
+
+	interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"DIAG_DL1 ") : NULL;
+	interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"DIAG_DL2 ") : NULL;
+
+	interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"DIAG_UL ") : NULL;
+
+	interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"APP1_DL ") : NULL;
+	interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"APP2_DL ") : NULL;
+
+	interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"APP1_UL ") : NULL;
+	interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"APP2_UL ") : NULL;
+
+	interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"CTRL_DL ") : NULL;
+	interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"CTRL_UL ") : NULL;
+
+	interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+					"RESET ") : NULL;
+
+	return buf;
+}
+#endif
+
+/*
+ * Receive flow control
+ * Return 1 - If ok, else 0
+ */
+static int receive_flow_control(struct nozomi *dc)
+{
+	enum port_type port = PORT_MDM;
+	struct ctrl_dl ctrl_dl;
+	struct ctrl_dl old_ctrl;
+	u16 enable_ier = 0;
+
+	read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
+
+	switch (ctrl_dl.port) {
+	case CTRL_CMD:
+		DBG1("The Base Band sends this value as a response to a "
+			"request for IMSI detach sent over the control "
+			"channel uplink (see section 7.6.1).");
+		break;
+	case CTRL_MDM:
+		port = PORT_MDM;
+		enable_ier = MDM_DL;
+		break;
+	case CTRL_DIAG:
+		port = PORT_DIAG;
+		enable_ier = DIAG_DL;
+		break;
+	case CTRL_APP1:
+		port = PORT_APP1;
+		enable_ier = APP1_DL;
+		break;
+	case CTRL_APP2:
+		port = PORT_APP2;
+		enable_ier = APP2_DL;
+		break;
+	default:
+		dev_err(&dc->pdev->dev,
+			"ERROR: flow control received for non-existing port\n");
+		return 0;
+	};
+
+	DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
+	   *((u16 *)&ctrl_dl));
+
+	old_ctrl = dc->port[port].ctrl_dl;
+	dc->port[port].ctrl_dl = ctrl_dl;
+
+	if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
+		DBG1("Disable interrupt (0x%04X) on port: %d",
+			enable_ier, port);
+		disable_transmit_ul(port, dc);
+
+	} else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
+
+		if (__kfifo_len(dc->port[port].fifo_ul)) {
+			DBG1("Enable interrupt (0x%04X) on port: %d",
+				enable_ier, port);
+			DBG1("Data in buffer [%d], enable transmit! ",
+				__kfifo_len(dc->port[port].fifo_ul));
+			enable_transmit_ul(port, dc);
+		} else {
+			DBG1("No data in buffer...");
+		}
+	}
+
+	if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
+		DBG1(" No change in mctrl");
+		return 1;
+	}
+	/* Update statistics */
+	if (old_ctrl.CTS != ctrl_dl.CTS)
+		dc->port[port].tty_icount.cts++;
+	if (old_ctrl.DSR != ctrl_dl.DSR)
+		dc->port[port].tty_icount.dsr++;
+	if (old_ctrl.RI != ctrl_dl.RI)
+		dc->port[port].tty_icount.rng++;
+	if (old_ctrl.DCD != ctrl_dl.DCD)
+		dc->port[port].tty_icount.dcd++;
+
+	wake_up_interruptible(&dc->port[port].tty_wait);
+
+	DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
+	   port,
+	   dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
+	   dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
+
+	return 1;
+}
+
+static enum ctrl_port_type port2ctrl(enum port_type port,
+					const struct nozomi *dc)
+{
+	switch (port) {
+	case PORT_MDM:
+		return CTRL_MDM;
+	case PORT_DIAG:
+		return CTRL_DIAG;
+	case PORT_APP1:
+		return CTRL_APP1;
+	case PORT_APP2:
+		return CTRL_APP2;
+	default:
+		dev_err(&dc->pdev->dev,
+			"ERROR: send flow control " \
+			"received for non-existing port\n");
+	};
+	return CTRL_ERROR;
+}
+
+/*
+ * Send flow control, can only update one channel at a time
+ * Return 0 - If we have updated all flow control
+ * Return 1 - If we need to update more flow control, ack current enable more
+ */
+static int send_flow_control(struct nozomi *dc)
+{
+	u32 i, more_flow_control_to_be_updated = 0;
+	u16 *ctrl;
+
+	for (i = PORT_MDM; i < MAX_PORT; i++) {
+		if (dc->port[i].update_flow_control) {
+			if (more_flow_control_to_be_updated) {
+				/* We have more flow control to be updated */
+				return 1;
+			}
+			dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
+			ctrl = (u16 *)&dc->port[i].ctrl_ul;
+			write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
+				(u32 *) ctrl, 2);
+			dc->port[i].update_flow_control = 0;
+			more_flow_control_to_be_updated = 1;
+		}
+	}
+	return 0;
+}
+
+/*
+ * Handle downlink data, ports that are handled are modem and diagnostics
+ * Return 1 - ok
+ * Return 0 - toggle fields are out of sync
+ */
+static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
+			u16 read_iir, u16 mask1, u16 mask2)
+{
+	if (*toggle == 0 && read_iir & mask1) {
+		if (receive_data(port, dc)) {
+			writew(mask1, dc->reg_fcr);
+			*toggle = !(*toggle);
+		}
+
+		if (read_iir & mask2) {
+			if (receive_data(port, dc)) {
+				writew(mask2, dc->reg_fcr);
+				*toggle = !(*toggle);
+			}
+		}
+	} else if (*toggle == 1 && read_iir & mask2) {
+		if (receive_data(port, dc)) {
+			writew(mask2, dc->reg_fcr);
+			*toggle = !(*toggle);
+		}
+
+		if (read_iir & mask1) {
+			if (receive_data(port, dc)) {
+				writew(mask1, dc->reg_fcr);
+				*toggle = !(*toggle);
+			}
+		}
+	} else {
+		dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
+			*toggle);
+		return 0;
+	}
+	return 1;
+}
+
+/*
+ * Handle uplink data, this is currently for the modem port
+ * Return 1 - ok
+ * Return 0 - toggle field are out of sync
+ */
+static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
+{
+	u8 *toggle = &(dc->port[port].toggle_ul);
+
+	if (*toggle == 0 && read_iir & MDM_UL1) {
+		dc->last_ier &= ~MDM_UL;
+		writew(dc->last_ier, dc->reg_ier);
+		if (send_data(port, dc)) {
+			writew(MDM_UL1, dc->reg_fcr);
+			dc->last_ier = dc->last_ier | MDM_UL;
+			writew(dc->last_ier, dc->reg_ier);
+			*toggle = !*toggle;
+		}
+
+		if (read_iir & MDM_UL2) {
+			dc->last_ier &= ~MDM_UL;
+			writew(dc->last_ier, dc->reg_ier);
+			if (send_data(port, dc)) {
+				writew(MDM_UL2, dc->reg_fcr);
+				dc->last_ier = dc->last_ier | MDM_UL;
+				writew(dc->last_ier, dc->reg_ier);
+				*toggle = !*toggle;
+			}
+		}
+
+	} else if (*toggle == 1 && read_iir & MDM_UL2) {
+		dc->last_ier &= ~MDM_UL;
+		writew(dc->last_ier, dc->reg_ier);
+		if (send_data(port, dc)) {
+			writew(MDM_UL2, dc->reg_fcr);
+			dc->last_ier = dc->last_ier | MDM_UL;
+			writew(dc->last_ier, dc->reg_ier);
+			*toggle = !*toggle;
+		}
+
+		if (read_iir & MDM_UL1) {
+			dc->last_ier &= ~MDM_UL;
+			writew(dc->last_ier, dc->reg_ier);
+			if (send_data(port, dc)) {
+				writew(MDM_UL1, dc->reg_fcr);
+				dc->last_ier = dc->last_ier | MDM_UL;
+				writew(dc->last_ier, dc->reg_ier);
+				*toggle = !*toggle;
+			}
+		}
+	} else {
+		writew(read_iir & MDM_UL, dc->reg_fcr);
+		dev_err(&dc->pdev->dev, "port out of sync!\n");
+		return 0;
+	}
+	return 1;
+}
+
+static irqreturn_t interrupt_handler(int irq, void *dev_id)
+{
+	struct nozomi *dc = dev_id;
+	unsigned int a;
+	u16 read_iir;
+
+	if (!dc)
+		return IRQ_NONE;
+
+	spin_lock(&dc->spin_mutex);
+	read_iir = readw(dc->reg_iir);
+
+	/* Card removed */
+	if (read_iir == (u16)-1)
+		goto none;
+	/*
+	 * Just handle interrupt enabled in IER
+	 * (by masking with dc->last_ier)
+	 */
+	read_iir &= dc->last_ier;
+
+	if (read_iir == 0)
+		goto none;
+
+
+	DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
+		dc->last_ier);
+
+	if (read_iir & RESET) {
+		if (unlikely(!nozomi_read_config_table(dc))) {
+			dc->last_ier = 0x0;
+			writew(dc->last_ier, dc->reg_ier);
+			dev_err(&dc->pdev->dev, "Could not read status from "
+				"card, we should disable interface\n");
+		} else {
+			writew(RESET, dc->reg_fcr);
+		}
+		/* No more useful info if this was the reset interrupt. */
+		goto exit_handler;
+	}
+	if (read_iir & CTRL_UL) {
+		DBG1("CTRL_UL");
+		dc->last_ier &= ~CTRL_UL;
+		writew(dc->last_ier, dc->reg_ier);
+		if (send_flow_control(dc)) {
+			writew(CTRL_UL, dc->reg_fcr);
+			dc->last_ier = dc->last_ier | CTRL_UL;
+			writew(dc->last_ier, dc->reg_ier);
+		}
+	}
+	if (read_iir & CTRL_DL) {
+		receive_flow_control(dc);
+		writew(CTRL_DL, dc->reg_fcr);
+	}
+	if (read_iir & MDM_DL) {
+		if (!handle_data_dl(dc, PORT_MDM,
+				&(dc->port[PORT_MDM].toggle_dl), read_iir,
+				MDM_DL1, MDM_DL2)) {
+			dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
+			goto exit_handler;
+		}
+	}
+	if (read_iir & MDM_UL) {
+		if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
+			dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
+			goto exit_handler;
+		}
+	}
+	if (read_iir & DIAG_DL) {
+		if (!handle_data_dl(dc, PORT_DIAG,
+				&(dc->port[PORT_DIAG].toggle_dl), read_iir,
+				DIAG_DL1, DIAG_DL2)) {
+			dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
+			goto exit_handler;
+		}
+	}
+	if (read_iir & DIAG_UL) {
+		dc->last_ier &= ~DIAG_UL;
+		writew(dc->last_ier, dc->reg_ier);
+		if (send_data(PORT_DIAG, dc)) {
+			writew(DIAG_UL, dc->reg_fcr);
+			dc->last_ier = dc->last_ier | DIAG_UL;
+			writew(dc->last_ier, dc->reg_ier);
+		}
+	}
+	if (read_iir & APP1_DL) {
+		if (receive_data(PORT_APP1, dc))
+			writew(APP1_DL, dc->reg_fcr);
+	}
+	if (read_iir & APP1_UL) {
+		dc->last_ier &= ~APP1_UL;
+		writew(dc->last_ier, dc->reg_ier);
+		if (send_data(PORT_APP1, dc)) {
+			writew(APP1_UL, dc->reg_fcr);
+			dc->last_ier = dc->last_ier | APP1_UL;
+			writew(dc->last_ier, dc->reg_ier);
+		}
+	}
+	if (read_iir & APP2_DL) {
+		if (receive_data(PORT_APP2, dc))
+			writew(APP2_DL, dc->reg_fcr);
+	}
+	if (read_iir & APP2_UL) {
+		dc->last_ier &= ~APP2_UL;
+		writew(dc->last_ier, dc->reg_ier);
+		if (send_data(PORT_APP2, dc)) {
+			writew(APP2_UL, dc->reg_fcr);
+			dc->last_ier = dc->last_ier | APP2_UL;
+			writew(dc->last_ier, dc->reg_ier);
+		}
+	}
+
+exit_handler:
+	spin_unlock(&dc->spin_mutex);
+	for (a = 0; a < NOZOMI_MAX_PORTS; a++)
+		if (test_and_clear_bit(a, &dc->flip))
+			tty_flip_buffer_push(dc->port[a].tty);
+	return IRQ_HANDLED;
+none:
+	spin_unlock(&dc->spin_mutex);
+	return IRQ_NONE;
+}
+
+static void nozomi_get_card_type(struct nozomi *dc)
+{
+	int i;
+	u32 size = 0;
+
+	for (i = 0; i < 6; i++)
+		size += pci_resource_len(dc->pdev, i);
+
+	/* Assume card type F32_8 if no match */
+	dc->card_type = size == 2048 ? F32_2 : F32_8;
+
+	dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
+}
+
+static void nozomi_setup_private_data(struct nozomi *dc)
+{
+	void __iomem *offset = dc->base_addr + dc->card_type / 2;
+	unsigned int i;
+
+	dc->reg_fcr = (void __iomem *)(offset + R_FCR);
+	dc->reg_iir = (void __iomem *)(offset + R_IIR);
+	dc->reg_ier = (void __iomem *)(offset + R_IER);
+	dc->last_ier = 0;
+	dc->flip = 0;
+
+	dc->port[PORT_MDM].token_dl = MDM_DL;
+	dc->port[PORT_DIAG].token_dl = DIAG_DL;
+	dc->port[PORT_APP1].token_dl = APP1_DL;
+	dc->port[PORT_APP2].token_dl = APP2_DL;
+
+	for (i = 0; i < MAX_PORT; i++)
+		init_waitqueue_head(&dc->port[i].tty_wait);
+}
+
+static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
+
+	return sprintf(buf, "%d\n", dc->card_type);
+}
+static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
+
+static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
+
+	return sprintf(buf, "%u\n", dc->open_ttys);
+}
+static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
+
+static void make_sysfs_files(struct nozomi *dc)
+{
+	if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
+		dev_err(&dc->pdev->dev,
+			"Could not create sysfs file for card_type\n");
+	if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
+		dev_err(&dc->pdev->dev,
+			"Could not create sysfs file for open_ttys\n");
+}
+
+static void remove_sysfs_files(struct nozomi *dc)
+{
+	device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
+	device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
+}
+
+/* Allocate memory for one device */
+static int __devinit nozomi_card_init(struct pci_dev *pdev,
+				      const struct pci_device_id *ent)
+{
+	resource_size_t start;
+	int ret;
+	struct nozomi *dc = NULL;
+	int ndev_idx;
+	int i;
+
+	dev_dbg(&pdev->dev, "Init, new card found\n");
+
+	for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
+		if (!ndevs[ndev_idx])
+			break;
+
+	if (ndev_idx >= ARRAY_SIZE(ndevs)) {
+		dev_err(&pdev->dev, "no free tty range for this card left\n");
+		ret = -EIO;
+		goto err;
+	}
+
+	dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
+	if (unlikely(!dc)) {
+		dev_err(&pdev->dev, "Could not allocate memory\n");
+		ret = -ENOMEM;
+		goto err_free;
+	}
+
+	dc->pdev = pdev;
+
+	/* Find out what card type it is */
+	nozomi_get_card_type(dc);
+
+	ret = pci_enable_device(dc->pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to enable PCI Device\n");
+		goto err_free;
+	}
+
+	start = pci_resource_start(dc->pdev, 0);
+	if (start == 0) {
+		dev_err(&pdev->dev, "No I/O address for card detected\n");
+		ret = -ENODEV;
+		goto err_disable_device;
+	}
+
+	ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
+	if (ret) {
+		dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
+			(int) /* nozomi_private.io_addr */ 0);
+		goto err_disable_device;
+	}
+
+	dc->base_addr = ioremap(start, dc->card_type);
+	if (!dc->base_addr) {
+		dev_err(&pdev->dev, "Unable to map card MMIO\n");
+		ret = -ENODEV;
+		goto err_rel_regs;
+	}
+
+	dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
+	if (!dc->send_buf) {
+		dev_err(&pdev->dev, "Could not allocate send buffer?\n");
+		ret = -ENOMEM;
+		goto err_free_sbuf;
+	}
+
+	spin_lock_init(&dc->spin_mutex);
+
+	nozomi_setup_private_data(dc);
+
+	/* Disable all interrupts */
+	dc->last_ier = 0;
+	writew(dc->last_ier, dc->reg_ier);
+
+	ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
+			NOZOMI_NAME, dc);
+	if (unlikely(ret)) {
+		dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
+		goto err_free_sbuf;
+	}
+
+	DBG1("base_addr: %p", dc->base_addr);
+
+	make_sysfs_files(dc);
+
+	dc->index_start = ndev_idx * MAX_PORT;
+	ndevs[ndev_idx] = dc;
+
+	for (i = 0; i < MAX_PORT; i++) {
+		mutex_init(&dc->port[i].tty_sem);
+		dc->port[i].tty_open_count = 0;
+		dc->port[i].tty = NULL;
+		tty_register_device(ntty_driver, dc->index_start + i,
+							&pdev->dev);
+	}
+
+	/* Enable  RESET interrupt. */
+	dc->last_ier = RESET;
+	writew(dc->last_ier, dc->reg_ier);
+
+	pci_set_drvdata(pdev, dc);
+
+	return 0;
+
+err_free_sbuf:
+	kfree(dc->send_buf);
+	iounmap(dc->base_addr);
+err_rel_regs:
+	pci_release_regions(pdev);
+err_disable_device:
+	pci_disable_device(pdev);
+err_free:
+	kfree(dc);
+err:
+	return ret;
+}
+
+static void __devexit tty_exit(struct nozomi *dc)
+{
+	unsigned int i;
+
+	DBG1(" ");
+
+	flush_scheduled_work();
+
+	for (i = 0; i < MAX_PORT; ++i)
+		if (dc->port[i].tty && \
+				list_empty(&dc->port[i].tty->hangup_work.entry))
+			tty_hangup(dc->port[i].tty);
+
+	while (dc->open_ttys)
+		msleep(1);
+
+	for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
+		tty_unregister_device(ntty_driver, i);
+}
+
+/* Deallocate memory for one device */
+static void __devexit nozomi_card_exit(struct pci_dev *pdev)
+{
+	int i;
+	struct ctrl_ul ctrl;
+	struct nozomi *dc = pci_get_drvdata(pdev);
+
+	/* Disable all interrupts */
+	dc->last_ier = 0;
+	writew(dc->last_ier, dc->reg_ier);
+
+	tty_exit(dc);
+
+	/* Send 0x0001, command card to resend the reset token.  */
+	/* This is to get the reset when the module is reloaded. */
+	ctrl.port = 0x00;
+	ctrl.reserved = 0;
+	ctrl.RTS = 0;
+	ctrl.DTR = 1;
+	DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
+
+	/* Setup dc->reg addresses to we can use defines here */
+	write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
+	writew(CTRL_UL, dc->reg_fcr);	/* push the token to the card. */
+
+	remove_sysfs_files(dc);
+
+	free_irq(pdev->irq, dc);
+
+	for (i = 0; i < MAX_PORT; i++)
+		if (dc->port[i].fifo_ul)
+			kfifo_free(dc->port[i].fifo_ul);
+
+	kfree(dc->send_buf);
+
+	iounmap(dc->base_addr);
+
+	pci_release_regions(pdev);
+
+	pci_disable_device(pdev);
+
+	ndevs[dc->index_start / MAX_PORT] = NULL;
+
+	kfree(dc);
+}
+
+static void set_rts(const struct tty_struct *tty, int rts)
+{
+	struct port *port = get_port_by_tty(tty);
+
+	port->ctrl_ul.RTS = rts;
+	port->update_flow_control = 1;
+	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
+}
+
+static void set_dtr(const struct tty_struct *tty, int dtr)
+{
+	struct port *port = get_port_by_tty(tty);
+
+	DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
+
+	port->ctrl_ul.DTR = dtr;
+	port->update_flow_control = 1;
+	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
+}
+
+/*
+ * ----------------------------------------------------------------------------
+ * TTY code
+ * ----------------------------------------------------------------------------
+ */
+
+/* Called when the userspace process opens the tty, /dev/noz*.  */
+static int ntty_open(struct tty_struct *tty, struct file *file)
+{
+	struct port *port = get_port_by_tty(tty);
+	struct nozomi *dc = get_dc_by_tty(tty);
+	unsigned long flags;
+
+	if (!port || !dc)
+		return -ENODEV;
+
+	if (mutex_lock_interruptible(&port->tty_sem))
+		return -ERESTARTSYS;
+
+	port->tty_open_count++;
+	dc->open_ttys++;
+
+	/* Enable interrupt downlink for channel */
+	if (port->tty_open_count == 1) {
+		tty->low_latency = 1;
+		tty->driver_data = port;
+		port->tty = tty;
+		DBG1("open: %d", port->token_dl);
+		spin_lock_irqsave(&dc->spin_mutex, flags);
+		dc->last_ier = dc->last_ier | port->token_dl;
+		writew(dc->last_ier, dc->reg_ier);
+		spin_unlock_irqrestore(&dc->spin_mutex, flags);
+	}
+
+	mutex_unlock(&port->tty_sem);
+
+	return 0;
+}
+
+/* Called when the userspace process close the tty, /dev/noz*. */
+static void ntty_close(struct tty_struct *tty, struct file *file)
+{
+	struct nozomi *dc = get_dc_by_tty(tty);
+	struct port *port = tty->driver_data;
+	unsigned long flags;
+
+	if (!dc || !port)
+		return;
+
+	if (mutex_lock_interruptible(&port->tty_sem))
+		return;
+
+	if (!port->tty_open_count)
+		goto exit;
+
+	dc->open_ttys--;
+	port->tty_open_count--;
+
+	if (port->tty_open_count == 0) {
+		DBG1("close: %d", port->token_dl);
+		spin_lock_irqsave(&dc->spin_mutex, flags);
+		dc->last_ier &= ~(port->token_dl);
+		writew(dc->last_ier, dc->reg_ier);
+		spin_unlock_irqrestore(&dc->spin_mutex, flags);
+	}
+
+exit:
+	mutex_unlock(&port->tty_sem);
+}
+
+/*
+ * called when the userspace process writes to the tty (/dev/noz*).
+ * Data is inserted into a fifo, which is then read and transfered to the modem.
+ */
+static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
+		      int count)
+{
+	int rval = -EINVAL;
+	struct nozomi *dc = get_dc_by_tty(tty);
+	struct port *port = tty->driver_data;
+	unsigned long flags;
+
+	/* DBG1( "WRITEx: %d, index = %d", count, index); */
+
+	if (!dc || !port)
+		return -ENODEV;
+
+	if (unlikely(!mutex_trylock(&port->tty_sem))) {
+		/*
+		 * must test lock as tty layer wraps calls
+		 * to this function with BKL
+		 */
+		dev_err(&dc->pdev->dev, "Would have deadlocked - "
+			"return EAGAIN\n");
+		return -EAGAIN;
+	}
+
+	if (unlikely(!port->tty_open_count)) {
+		DBG1(" ");
+		goto exit;
+	}
+
+	rval = __kfifo_put(port->fifo_ul, (unsigned char *)buffer, count);
+
+	/* notify card */
+	if (unlikely(dc == NULL)) {
+		DBG1("No device context?");
+		goto exit;
+	}
+
+	spin_lock_irqsave(&dc->spin_mutex, flags);
+	/* CTS is only valid on the modem channel */
+	if (port == &(dc->port[PORT_MDM])) {
+		if (port->ctrl_dl.CTS) {
+			DBG4("Enable interrupt");
+			enable_transmit_ul(tty->index % MAX_PORT, dc);
+		} else {
+			dev_err(&dc->pdev->dev,
+				"CTS not active on modem port?\n");
+		}
+	} else {
+		enable_transmit_ul(tty->index % MAX_PORT, dc);
+	}
+	spin_unlock_irqrestore(&dc->spin_mutex, flags);
+
+exit:
+	mutex_unlock(&port->tty_sem);
+	return rval;
+}
+
+/*
+ * Calculate how much is left in device
+ * This method is called by the upper tty layer.
+ *   #according to sources N_TTY.c it expects a value >= 0 and
+ *    does not check for negative values.
+ */
+static int ntty_write_room(struct tty_struct *tty)
+{
+	struct port *port = tty->driver_data;
+	int room = 0;
+	struct nozomi *dc = get_dc_by_tty(tty);
+
+	if (!dc || !port)
+		return 0;
+	if (!mutex_trylock(&port->tty_sem))
+		return 0;
+
+	if (!port->tty_open_count)
+		goto exit;
+
+	room = port->fifo_ul->size - __kfifo_len(port->fifo_ul);
+
+exit:
+	mutex_unlock(&port->tty_sem);
+	return room;
+}
+
+/* Gets io control parameters */
+static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
+{
+	struct port *port = tty->driver_data;
+	struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
+	struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
+
+	return	(ctrl_ul->RTS ? TIOCM_RTS : 0) |
+		(ctrl_ul->DTR ? TIOCM_DTR : 0) |
+		(ctrl_dl->DCD ? TIOCM_CAR : 0) |
+		(ctrl_dl->RI  ? TIOCM_RNG : 0) |
+		(ctrl_dl->DSR ? TIOCM_DSR : 0) |
+		(ctrl_dl->CTS ? TIOCM_CTS : 0);
+}
+
+/* Sets io controls parameters */
+static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
+	unsigned int set, unsigned int clear)
+{
+	if (set & TIOCM_RTS)
+		set_rts(tty, 1);
+	else if (clear & TIOCM_RTS)
+		set_rts(tty, 0);
+
+	if (set & TIOCM_DTR)
+		set_dtr(tty, 1);
+	else if (clear & TIOCM_DTR)
+		set_dtr(tty, 0);
+
+	return 0;
+}
+
+static int ntty_cflags_changed(struct port *port, unsigned long flags,
+		struct async_icount *cprev)
+{
+	struct async_icount cnow = port->tty_icount;
+	int ret;
+
+	ret =	((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
+		((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
+		((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
+		((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
+
+	*cprev = cnow;
+
+	return ret;
+}
+
+static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
+{
+	struct async_icount cnow = port->tty_icount;
+	struct serial_icounter_struct icount;
+
+	icount.cts = cnow.cts;
+	icount.dsr = cnow.dsr;
+	icount.rng = cnow.rng;
+	icount.dcd = cnow.dcd;
+	icount.rx = cnow.rx;
+	icount.tx = cnow.tx;
+	icount.frame = cnow.frame;
+	icount.overrun = cnow.overrun;
+	icount.parity = cnow.parity;
+	icount.brk = cnow.brk;
+	icount.buf_overrun = cnow.buf_overrun;
+
+	return copy_to_user(argp, &icount, sizeof(icount));
+}
+
+static int ntty_ioctl(struct tty_struct *tty, struct file *file,
+		      unsigned int cmd, unsigned long arg)
+{
+	struct port *port = tty->driver_data;
+	void __user *argp = (void __user *)arg;
+	int rval = -ENOIOCTLCMD;
+
+	DBG1("******** IOCTL, cmd: %d", cmd);
+
+	switch (cmd) {
+	case TIOCMIWAIT: {
+		struct async_icount cprev = port->tty_icount;
+
+		rval = wait_event_interruptible(port->tty_wait,
+				ntty_cflags_changed(port, arg, &cprev));
+		break;
+	} case TIOCGICOUNT:
+		rval = ntty_ioctl_tiocgicount(port, argp);
+		break;
+	default:
+		DBG1("ERR: 0x%08X, %d", cmd, cmd);
+		break;
+	};
+
+	return rval;
+}
+
+/*
+ * Called by the upper tty layer when tty buffers are ready
+ * to receive data again after a call to throttle.
+ */
+static void ntty_unthrottle(struct tty_struct *tty)
+{
+	struct nozomi *dc = get_dc_by_tty(tty);
+	unsigned long flags;
+
+	DBG1("UNTHROTTLE");
+	spin_lock_irqsave(&dc->spin_mutex, flags);
+	enable_transmit_dl(tty->index % MAX_PORT, dc);
+	set_rts(tty, 1);
+
+	spin_unlock_irqrestore(&dc->spin_mutex, flags);
+}
+
+/*
+ * Called by the upper tty layer when the tty buffers are almost full.
+ * The driver should stop send more data.
+ */
+static void ntty_throttle(struct tty_struct *tty)
+{
+	struct nozomi *dc = get_dc_by_tty(tty);
+	unsigned long flags;
+
+	DBG1("THROTTLE");
+	spin_lock_irqsave(&dc->spin_mutex, flags);
+	set_rts(tty, 0);
+	spin_unlock_irqrestore(&dc->spin_mutex, flags);
+}
+
+/* just to discard single character writes */
+static void ntty_put_char(struct tty_struct *tty, unsigned char c)
+{
+	/*
+	 * card does not react correct when we write single chars
+	 * to the card, so we discard them
+	 */
+	DBG2("PUT CHAR Function: %c", c);
+}
+
+/* Returns number of chars in buffer, called by tty layer */
+static s32 ntty_chars_in_buffer(struct tty_struct *tty)
+{
+	struct port *port = tty->driver_data;
+	struct nozomi *dc = get_dc_by_tty(tty);
+	s32 rval;
+
+	if (unlikely(!dc || !port)) {
+		rval = -ENODEV;
+		goto exit_in_buffer;
+	}
+
+	if (unlikely(!port->tty_open_count)) {
+		dev_err(&dc->pdev->dev, "No tty open?\n");
+		rval = -ENODEV;
+		goto exit_in_buffer;
+	}
+
+	rval = __kfifo_len(port->fifo_ul);
+
+exit_in_buffer:
+	return rval;
+}
+
+static struct tty_operations tty_ops = {
+	.ioctl = ntty_ioctl,
+	.open = ntty_open,
+	.close = ntty_close,
+	.write = ntty_write,
+	.write_room = ntty_write_room,
+	.unthrottle = ntty_unthrottle,
+	.throttle = ntty_throttle,
+	.chars_in_buffer = ntty_chars_in_buffer,
+	.put_char = ntty_put_char,
+	.tiocmget = ntty_tiocmget,
+	.tiocmset = ntty_tiocmset,
+};
+
+/* Module initialization */
+static struct pci_driver nozomi_driver = {
+	.name = NOZOMI_NAME,
+	.id_table = nozomi_pci_tbl,
+	.probe = nozomi_card_init,
+	.remove = __devexit_p(nozomi_card_exit),
+};
+
+static __init int nozomi_init(void)
+{
+	int ret;
+
+	printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
+
+	ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
+	if (!ntty_driver)
+		return -ENOMEM;
+
+	ntty_driver->owner = THIS_MODULE;
+	ntty_driver->driver_name = NOZOMI_NAME_TTY;
+	ntty_driver->name = "noz";
+	ntty_driver->major = 0;
+	ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+	ntty_driver->subtype = SERIAL_TYPE_NORMAL;
+	ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+	ntty_driver->init_termios = tty_std_termios;
+	ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
+						HUPCL | CLOCAL;
+	ntty_driver->init_termios.c_ispeed = 115200;
+	ntty_driver->init_termios.c_ospeed = 115200;
+	tty_set_operations(ntty_driver, &tty_ops);
+
+	ret = tty_register_driver(ntty_driver);
+	if (ret) {
+		printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
+		goto free_tty;
+	}
+
+	ret = pci_register_driver(&nozomi_driver);
+	if (ret) {
+		printk(KERN_ERR "Nozomi: can't register pci driver\n");
+		goto unr_tty;
+	}
+
+	return 0;
+unr_tty:
+	tty_unregister_driver(ntty_driver);
+free_tty:
+	put_tty_driver(ntty_driver);
+	return ret;
+}
+
+static __exit void nozomi_exit(void)
+{
+	printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
+	pci_unregister_driver(&nozomi_driver);
+	tty_unregister_driver(ntty_driver);
+	put_tty_driver(ntty_driver);
+}
+
+module_init(nozomi_init);
+module_exit(nozomi_exit);
+
+module_param(debug, int, S_IRUGO | S_IWUSR);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/