2 * nozomi.c -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
4 * Written by: Ulf Jakobsson,
8 * Maintained by: Paul Hardwick (p.hardwick@option.com)
11 * Locking code changes for Vodafone by Sphere Systems Ltd,
12 * Andrew Bird (ajb@spheresystems.co.uk )
15 * Source has been ported from an implementation made by Filip Aben @ Option
17 * --------------------------------------------------------------------------
19 * Copyright (c) 2005,2006 Option Wireless Sweden AB
20 * Copyright (c) 2006 Sphere Systems Ltd
21 * Copyright (c) 2006 Option Wireless n/v
22 * All rights Reserved.
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2 of the License, or
27 * (at your option) any later version.
29 * This program is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
32 * GNU General Public License for more details.
34 * You should have received a copy of the GNU General Public License
35 * along with this program; if not, write to the Free Software
36 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
38 * --------------------------------------------------------------------------
41 /* Enable this to have a lot of debug printouts */
44 #include <linux/kernel.h>
45 #include <linux/module.h>
46 #include <linux/pci.h>
47 #include <linux/ioport.h>
48 #include <linux/tty.h>
49 #include <linux/tty_driver.h>
50 #include <linux/tty_flip.h>
51 #include <linux/serial.h>
52 #include <linux/interrupt.h>
53 #include <linux/kmod.h>
54 #include <linux/init.h>
55 #include <linux/kfifo.h>
56 #include <linux/uaccess.h>
57 #include <asm/byteorder.h>
59 #include <linux/delay.h>
62 #define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
63 __DATE__ " " __TIME__ ")"
65 /* Macros definitions */
67 /* Default debug printout level */
68 #define NOZOMI_DEBUG_LEVEL 0x00
70 #define P_BUF_SIZE 128
71 #define NFO(_err_flag_, args...) \
73 char tmp[P_BUF_SIZE]; \
74 snprintf(tmp, sizeof(tmp), ##args); \
75 printk(_err_flag_ "[%d] %s(): %s\n", __LINE__, \
79 #define DBG1(args...) D_(0x01, ##args)
80 #define DBG2(args...) D_(0x02, ##args)
81 #define DBG3(args...) D_(0x04, ##args)
82 #define DBG4(args...) D_(0x08, ##args)
83 #define DBG5(args...) D_(0x10, ##args)
84 #define DBG6(args...) D_(0x20, ##args)
85 #define DBG7(args...) D_(0x40, ##args)
86 #define DBG8(args...) D_(0x80, ##args)
89 /* Do we need this settable at runtime? */
90 static int debug = NOZOMI_DEBUG_LEVEL;
92 #define D(lvl, args...) do \
93 {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
95 #define D_(lvl, args...) D(lvl, ##args)
97 /* These printouts are always printed */
101 #define D_(lvl, args...)
104 /* TODO: rewrite to optimize macros... */
106 #define TMP_BUF_MAX 256
108 #define DUMP(buf__,len__) \
110 char tbuf[TMP_BUF_MAX] = {0};\
112 snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
113 if (tbuf[len__-2] == '\r') {\
114 tbuf[len__-2] = 'r';\
116 DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
118 DBG1("SENDING: '%s' (%d)", tbuf, len__);\
123 #define NOZOMI_NAME "nozomi"
124 #define NOZOMI_NAME_TTY "nozomi_tty"
125 #define DRIVER_DESC "Nozomi driver"
127 #define NTTY_TTY_MAXMINORS 256
128 #define NTTY_FIFO_BUFFER_SIZE 8192
130 /* Must be power of 2 */
131 #define FIFO_BUFFER_SIZE_UL 8192
133 /* Size of tmp send buffer to card */
134 #define SEND_BUF_MAX 1024
135 #define RECEIVE_BUF_MAX 4
138 /* Define all types of vendors and devices to support */
139 #define VENDOR1 0x1931 /* Vendor Option */
140 #define DEVICE1 0x000c /* HSDPA card */
142 #define R_IIR 0x0000 /* Interrupt Identity Register */
143 #define R_FCR 0x0000 /* Flow Control Register */
144 #define R_IER 0x0004 /* Interrupt Enable Register */
146 #define CONFIG_MAGIC 0xEFEFFEFE
147 #define TOGGLE_VALID 0x0000
149 /* Definition of interrupt tokens */
150 #define MDM_DL1 0x0001
151 #define MDM_UL1 0x0002
152 #define MDM_DL2 0x0004
153 #define MDM_UL2 0x0008
154 #define DIAG_DL1 0x0010
155 #define DIAG_DL2 0x0020
156 #define DIAG_UL 0x0040
157 #define APP1_DL 0x0080
158 #define APP1_UL 0x0100
159 #define APP2_DL 0x0200
160 #define APP2_UL 0x0400
161 #define CTRL_DL 0x0800
162 #define CTRL_UL 0x1000
165 #define MDM_DL (MDM_DL1 | MDM_DL2)
166 #define MDM_UL (MDM_UL1 | MDM_UL2)
167 #define DIAG_DL (DIAG_DL1 | DIAG_DL2)
169 /* modem signal definition */
170 #define CTRL_DSR 0x0001
171 #define CTRL_DCD 0x0002
172 #define CTRL_RI 0x0004
173 #define CTRL_CTS 0x0008
175 #define CTRL_DTR 0x0001
176 #define CTRL_RTS 0x0002
179 #define NOZOMI_MAX_PORTS 5
180 #define NOZOMI_MAX_CARDS (NTTY_TTY_MAXMINORS / MAX_PORT)
182 /* Type definitions */
185 * There are two types of nozomi cards,
186 * one with 2048 memory and with 8192 memory
189 F32_2 = 2048, /* 512 bytes downlink + uplink * 2 -> 2048 */
190 F32_8 = 8192, /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
193 /* Two different toggle channels exist */
199 /* Port definition for the card regarding flow control */
200 enum ctrl_port_type {
209 /* Ports that the nozomi has */
223 unsigned int enabled:5; /*
224 * Toggle fields are valid if enabled is 0,
225 * else A-channels must always be used.
227 unsigned int diag_dl:1;
228 unsigned int mdm_dl:1;
229 unsigned int mdm_ul:1;
230 } __attribute__ ((packed));
232 /* Configuration table to read at startup of card */
233 /* Is for now only needed during initialization phase */
234 struct config_table {
236 u16 product_information;
239 struct toggles toggle;
242 * If this is 64, it can hold
243 * 60 bytes + 4 that is length field
249 * If this is 64, it can hold
250 * 60 bytes + 4 that is length field
265 } __attribute__ ((packed));
267 /* This stores all control downlink flags */
270 unsigned int reserved:4;
275 } __attribute__ ((packed));
277 /* This stores all control uplink flags */
280 unsigned int reserved:6;
283 } __attribute__ ((packed));
288 /* This represents the toggle information */
290 unsigned int mdm_ul:1;
291 unsigned int mdm_dl:1;
292 unsigned int diag_dl:1;
293 unsigned int enabled:5; /*
294 * Toggle fields are valid if enabled is 0,
295 * else A-channels must always be used.
297 } __attribute__ ((packed));
299 /* Configuration table to read at startup of card */
300 struct config_table {
303 u16 product_information;
304 struct toggles toggle;
308 * If this is 64, it can hold
309 * 60 bytes + 4 that is length field
325 } __attribute__ ((packed));
327 /* This stores all control downlink flags */
333 unsigned int reserverd:4;
335 } __attribute__ ((packed));
337 /* This stores all control uplink flags */
341 unsigned int reserved:6;
343 } __attribute__ ((packed));
346 /* This holds all information that is needed regarding a port */
348 u8 update_flow_control;
349 struct ctrl_ul ctrl_ul;
350 struct ctrl_dl ctrl_dl;
351 struct kfifo *fifo_ul;
352 void __iomem *dl_addr[2];
355 void __iomem *ul_addr[2];
360 struct tty_struct *tty;
362 /* mutex to ensure one access patch to this port */
363 struct mutex tty_sem;
364 wait_queue_head_t tty_wait;
365 struct async_icount tty_icount;
368 /* Private data one for each card in the system */
370 void __iomem *base_addr;
373 /* Pointers to registers */
374 void __iomem *reg_iir;
375 void __iomem *reg_fcr;
376 void __iomem *reg_ier;
379 enum card_type card_type;
380 struct config_table config_table; /* Configuration table */
381 struct pci_dev *pdev;
382 struct port port[NOZOMI_MAX_PORTS];
385 spinlock_t spin_mutex; /* secures access to registers and tty */
387 unsigned int index_start;
391 /* This is a data packet that is read or written to/from card */
393 u32 size; /* size is the length of the data buffer */
395 } __attribute__ ((packed));
397 /* Global variables */
398 static struct pci_device_id nozomi_pci_tbl[] = {
399 {PCI_DEVICE(VENDOR1, DEVICE1)},
403 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
405 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
406 static struct tty_driver *ntty_driver;
409 * find card by tty_index
411 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
413 return tty ? ndevs[tty->index / MAX_PORT] : NULL;
416 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
418 struct nozomi *ndev = get_dc_by_tty(tty);
419 return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
428 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
432 const u32 *ptr = (__force u32 *) mem_addr_start;
435 if (unlikely(!ptr || !buf))
438 /* shortcut for extremely often used cases */
439 switch (size_bytes) {
440 case 2: /* 2 bytes */
442 *buf16 = __le16_to_cpu(readw((void __iomem *)ptr));
445 case 4: /* 4 bytes */
446 *(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
451 while (i < size_bytes) {
452 if (size_bytes - i == 2) {
453 /* Handle 2 bytes in the end */
455 *(buf16) = __le16_to_cpu(readw((void __iomem *)ptr));
459 *(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
474 static u32 write_mem32(void __iomem *mem_addr_start, u32 *buf,
478 u32 *ptr = (__force u32 *) mem_addr_start;
481 if (unlikely(!ptr || !buf))
484 /* shortcut for extremely often used cases */
485 switch (size_bytes) {
486 case 2: /* 2 bytes */
488 writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
492 * also needs to write 4 bytes in this case
493 * so falling through..
495 case 4: /* 4 bytes */
496 writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
501 while (i < size_bytes) {
502 if (size_bytes - i == 2) {
505 writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
509 writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
518 /* Setup pointers to different channels and also setup buffer sizes. */
519 static void setup_memory(struct nozomi *dc)
521 void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
522 /* The length reported is including the length field of 4 bytes,
523 * hence subtract with 4.
525 const u16 buff_offset = 4;
527 /* Modem port dl configuration */
528 dc->port[PORT_MDM].dl_addr[CH_A] = offset;
529 dc->port[PORT_MDM].dl_addr[CH_B] =
530 (offset += dc->config_table.dl_mdm_len1);
531 dc->port[PORT_MDM].dl_size[CH_A] =
532 dc->config_table.dl_mdm_len1 - buff_offset;
533 dc->port[PORT_MDM].dl_size[CH_B] =
534 dc->config_table.dl_mdm_len2 - buff_offset;
536 /* Diag port dl configuration */
537 dc->port[PORT_DIAG].dl_addr[CH_A] =
538 (offset += dc->config_table.dl_mdm_len2);
539 dc->port[PORT_DIAG].dl_size[CH_A] =
540 dc->config_table.dl_diag_len1 - buff_offset;
541 dc->port[PORT_DIAG].dl_addr[CH_B] =
542 (offset += dc->config_table.dl_diag_len1);
543 dc->port[PORT_DIAG].dl_size[CH_B] =
544 dc->config_table.dl_diag_len2 - buff_offset;
546 /* App1 port dl configuration */
547 dc->port[PORT_APP1].dl_addr[CH_A] =
548 (offset += dc->config_table.dl_diag_len2);
549 dc->port[PORT_APP1].dl_size[CH_A] =
550 dc->config_table.dl_app1_len - buff_offset;
552 /* App2 port dl configuration */
553 dc->port[PORT_APP2].dl_addr[CH_A] =
554 (offset += dc->config_table.dl_app1_len);
555 dc->port[PORT_APP2].dl_size[CH_A] =
556 dc->config_table.dl_app2_len - buff_offset;
558 /* Ctrl dl configuration */
559 dc->port[PORT_CTRL].dl_addr[CH_A] =
560 (offset += dc->config_table.dl_app2_len);
561 dc->port[PORT_CTRL].dl_size[CH_A] =
562 dc->config_table.dl_ctrl_len - buff_offset;
564 offset = dc->base_addr + dc->config_table.ul_start;
566 /* Modem Port ul configuration */
567 dc->port[PORT_MDM].ul_addr[CH_A] = offset;
568 dc->port[PORT_MDM].ul_size[CH_A] =
569 dc->config_table.ul_mdm_len1 - buff_offset;
570 dc->port[PORT_MDM].ul_addr[CH_B] =
571 (offset += dc->config_table.ul_mdm_len1);
572 dc->port[PORT_MDM].ul_size[CH_B] =
573 dc->config_table.ul_mdm_len2 - buff_offset;
575 /* Diag port ul configuration */
576 dc->port[PORT_DIAG].ul_addr[CH_A] =
577 (offset += dc->config_table.ul_mdm_len2);
578 dc->port[PORT_DIAG].ul_size[CH_A] =
579 dc->config_table.ul_diag_len - buff_offset;
581 /* App1 port ul configuration */
582 dc->port[PORT_APP1].ul_addr[CH_A] =
583 (offset += dc->config_table.ul_diag_len);
584 dc->port[PORT_APP1].ul_size[CH_A] =
585 dc->config_table.ul_app1_len - buff_offset;
587 /* App2 port ul configuration */
588 dc->port[PORT_APP2].ul_addr[CH_A] =
589 (offset += dc->config_table.ul_app1_len);
590 dc->port[PORT_APP2].ul_size[CH_A] =
591 dc->config_table.ul_app2_len - buff_offset;
593 /* Ctrl ul configuration */
594 dc->port[PORT_CTRL].ul_addr[CH_A] =
595 (offset += dc->config_table.ul_app2_len);
596 dc->port[PORT_CTRL].ul_size[CH_A] =
597 dc->config_table.ul_ctrl_len - buff_offset;
600 /* Dump config table under initalization phase */
602 static void dump_table(const struct nozomi *dc)
604 DBG3("signature: 0x%08X", dc->config_table.signature);
605 DBG3("version: 0x%04X", dc->config_table.version);
606 DBG3("product_information: 0x%04X", \
607 dc->config_table.product_information);
608 DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
609 DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
610 DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
611 DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
613 DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
614 DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
615 dc->config_table.dl_mdm_len1);
616 DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
617 dc->config_table.dl_mdm_len2);
618 DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
619 dc->config_table.dl_diag_len1);
620 DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
621 dc->config_table.dl_diag_len2);
622 DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
623 dc->config_table.dl_app1_len);
624 DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
625 dc->config_table.dl_app2_len);
626 DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
627 dc->config_table.dl_ctrl_len);
628 DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
629 dc->config_table.ul_start);
630 DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
631 dc->config_table.ul_mdm_len1);
632 DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
633 dc->config_table.ul_mdm_len2);
634 DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
635 dc->config_table.ul_diag_len);
636 DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
637 dc->config_table.ul_app1_len);
638 DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
639 dc->config_table.ul_app2_len);
640 DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
641 dc->config_table.ul_ctrl_len);
644 static inline void dump_table(const struct nozomi *dc) { }
648 * Read configuration table from card under intalization phase
649 * Returns 1 if ok, else 0
651 static int nozomi_read_config_table(struct nozomi *dc)
653 read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
654 sizeof(struct config_table));
656 if (dc->config_table.signature != CONFIG_MAGIC) {
657 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
658 dc->config_table.signature, CONFIG_MAGIC);
662 if ((dc->config_table.version == 0)
663 || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
665 DBG1("Second phase, configuring card");
669 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
670 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
671 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
672 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
673 dc->port[PORT_MDM].toggle_ul,
674 dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
678 for (i = PORT_MDM; i < MAX_PORT; i++) {
679 dc->port[i].fifo_ul =
680 kfifo_alloc(FIFO_BUFFER_SIZE_UL, GFP_ATOMIC, NULL);
681 memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
682 memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
685 /* Enable control channel */
686 dc->last_ier = dc->last_ier | CTRL_DL;
687 writew(dc->last_ier, dc->reg_ier);
689 dev_info(&dc->pdev->dev, "Initialization OK!\n");
693 if ((dc->config_table.version > 0)
694 && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
696 DBG1("First phase: pushing upload buffers, clearing download");
698 dev_info(&dc->pdev->dev, "Version of card: %d\n",
699 dc->config_table.version);
701 /* Here we should disable all I/O over F32. */
705 * We should send ALL channel pair tokens back along
709 /* push upload modem buffers */
710 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
712 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
715 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
717 DBG1("First phase done");
723 /* Enable uplink interrupts */
724 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
726 u16 mask[NOZOMI_MAX_PORTS] = \
727 {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
729 if (port < NOZOMI_MAX_PORTS) {
730 dc->last_ier |= mask[port];
731 writew(dc->last_ier, dc->reg_ier);
733 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
737 /* Disable uplink interrupts */
738 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
740 u16 mask[NOZOMI_MAX_PORTS] = \
741 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
743 if (port < NOZOMI_MAX_PORTS) {
744 dc->last_ier &= mask[port];
745 writew(dc->last_ier, dc->reg_ier);
747 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
751 /* Enable downlink interrupts */
752 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
754 u16 mask[NOZOMI_MAX_PORTS] = \
755 {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
757 if (port < NOZOMI_MAX_PORTS) {
758 dc->last_ier |= mask[port];
759 writew(dc->last_ier, dc->reg_ier);
761 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
765 /* Disable downlink interrupts */
766 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
768 u16 mask[NOZOMI_MAX_PORTS] = \
769 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
771 if (port < NOZOMI_MAX_PORTS) {
772 dc->last_ier &= mask[port];
773 writew(dc->last_ier, dc->reg_ier);
775 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
780 * Return 1 - send buffer to card and ack.
781 * Return 0 - don't ack, don't send buffer to card.
783 static int send_data(enum port_type index, struct nozomi *dc)
786 struct port *port = &dc->port[index];
787 u8 toggle = port->toggle_ul;
788 void __iomem *addr = port->ul_addr[toggle];
789 u32 ul_size = port->ul_size[toggle];
790 struct tty_struct *tty = port->tty;
792 /* Get data from tty and place in buf for now */
793 size = __kfifo_get(port->fifo_ul, dc->send_buf,
794 ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
797 DBG4("No more data to send, disable link:");
801 /* DUMP(buf, size); */
803 /* Write length + data */
804 write_mem32(addr, (u32 *) &size, 4);
805 write_mem32(addr + 4, (u32 *) dc->send_buf, size);
813 /* If all data has been read, return 1, else 0 */
814 static int receive_data(enum port_type index, struct nozomi *dc)
816 u8 buf[RECEIVE_BUF_MAX] = { 0 };
819 struct port *port = &dc->port[index];
820 void __iomem *addr = port->dl_addr[port->toggle_dl];
821 struct tty_struct *tty = port->tty;
824 if (unlikely(!tty)) {
825 DBG1("tty not open for port: %d?", index);
829 read_mem32((u32 *) &size, addr, 4);
830 /* DBG1( "%d bytes port: %d", size, index); */
832 if (test_bit(TTY_THROTTLED, &tty->flags)) {
833 DBG1("No room in tty, don't read data, don't ack interrupt, "
834 "disable interrupt");
836 /* disable interrupt in downlink... */
837 disable_transmit_dl(index, dc);
841 if (unlikely(size == 0)) {
842 dev_err(&dc->pdev->dev, "size == 0?\n");
846 tty_buffer_request_room(tty, size);
849 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
852 tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
854 } else if (size < RECEIVE_BUF_MAX) {
855 size -= tty_insert_flip_string(tty, (char *) buf, size);
857 i = tty_insert_flip_string(tty, \
858 (char *) buf, RECEIVE_BUF_MAX);
864 set_bit(index, &dc->flip);
869 /* Debug for interrupts */
871 static char *interrupt2str(u16 interrupt)
873 static char buf[TMP_BUF_MAX];
876 interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
877 interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
880 interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
882 interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
885 interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
887 interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
890 interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
893 interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
895 interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
898 interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
900 interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
903 interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
905 interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
908 interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
916 * Receive flow control
917 * Return 1 - If ok, else 0
919 static int receive_flow_control(struct nozomi *dc)
921 enum port_type port = PORT_MDM;
922 struct ctrl_dl ctrl_dl;
923 struct ctrl_dl old_ctrl;
926 read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
928 switch (ctrl_dl.port) {
930 DBG1("The Base Band sends this value as a response to a "
931 "request for IMSI detach sent over the control "
932 "channel uplink (see section 7.6.1).");
940 enable_ier = DIAG_DL;
944 enable_ier = APP1_DL;
948 enable_ier = APP2_DL;
951 dev_err(&dc->pdev->dev,
952 "ERROR: flow control received for non-existing port\n");
956 DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
959 old_ctrl = dc->port[port].ctrl_dl;
960 dc->port[port].ctrl_dl = ctrl_dl;
962 if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
963 DBG1("Disable interrupt (0x%04X) on port: %d",
965 disable_transmit_ul(port, dc);
967 } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
969 if (__kfifo_len(dc->port[port].fifo_ul)) {
970 DBG1("Enable interrupt (0x%04X) on port: %d",
972 DBG1("Data in buffer [%d], enable transmit! ",
973 __kfifo_len(dc->port[port].fifo_ul));
974 enable_transmit_ul(port, dc);
976 DBG1("No data in buffer...");
980 if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
981 DBG1(" No change in mctrl");
984 /* Update statistics */
985 if (old_ctrl.CTS != ctrl_dl.CTS)
986 dc->port[port].tty_icount.cts++;
987 if (old_ctrl.DSR != ctrl_dl.DSR)
988 dc->port[port].tty_icount.dsr++;
989 if (old_ctrl.RI != ctrl_dl.RI)
990 dc->port[port].tty_icount.rng++;
991 if (old_ctrl.DCD != ctrl_dl.DCD)
992 dc->port[port].tty_icount.dcd++;
994 wake_up_interruptible(&dc->port[port].tty_wait);
996 DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
998 dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
999 dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1004 static enum ctrl_port_type port2ctrl(enum port_type port,
1005 const struct nozomi *dc)
1017 dev_err(&dc->pdev->dev,
1018 "ERROR: send flow control " \
1019 "received for non-existing port\n");
1025 * Send flow control, can only update one channel at a time
1026 * Return 0 - If we have updated all flow control
1027 * Return 1 - If we need to update more flow control, ack current enable more
1029 static int send_flow_control(struct nozomi *dc)
1031 u32 i, more_flow_control_to_be_updated = 0;
1034 for (i = PORT_MDM; i < MAX_PORT; i++) {
1035 if (dc->port[i].update_flow_control) {
1036 if (more_flow_control_to_be_updated) {
1037 /* We have more flow control to be updated */
1040 dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1041 ctrl = (u16 *)&dc->port[i].ctrl_ul;
1042 write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1044 dc->port[i].update_flow_control = 0;
1045 more_flow_control_to_be_updated = 1;
1052 * Handle downlink data, ports that are handled are modem and diagnostics
1054 * Return 0 - toggle fields are out of sync
1056 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1057 u16 read_iir, u16 mask1, u16 mask2)
1059 if (*toggle == 0 && read_iir & mask1) {
1060 if (receive_data(port, dc)) {
1061 writew(mask1, dc->reg_fcr);
1062 *toggle = !(*toggle);
1065 if (read_iir & mask2) {
1066 if (receive_data(port, dc)) {
1067 writew(mask2, dc->reg_fcr);
1068 *toggle = !(*toggle);
1071 } else if (*toggle == 1 && read_iir & mask2) {
1072 if (receive_data(port, dc)) {
1073 writew(mask2, dc->reg_fcr);
1074 *toggle = !(*toggle);
1077 if (read_iir & mask1) {
1078 if (receive_data(port, dc)) {
1079 writew(mask1, dc->reg_fcr);
1080 *toggle = !(*toggle);
1084 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1092 * Handle uplink data, this is currently for the modem port
1094 * Return 0 - toggle field are out of sync
1096 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1098 u8 *toggle = &(dc->port[port].toggle_ul);
1100 if (*toggle == 0 && read_iir & MDM_UL1) {
1101 dc->last_ier &= ~MDM_UL;
1102 writew(dc->last_ier, dc->reg_ier);
1103 if (send_data(port, dc)) {
1104 writew(MDM_UL1, dc->reg_fcr);
1105 dc->last_ier = dc->last_ier | MDM_UL;
1106 writew(dc->last_ier, dc->reg_ier);
1110 if (read_iir & MDM_UL2) {
1111 dc->last_ier &= ~MDM_UL;
1112 writew(dc->last_ier, dc->reg_ier);
1113 if (send_data(port, dc)) {
1114 writew(MDM_UL2, dc->reg_fcr);
1115 dc->last_ier = dc->last_ier | MDM_UL;
1116 writew(dc->last_ier, dc->reg_ier);
1121 } else if (*toggle == 1 && read_iir & MDM_UL2) {
1122 dc->last_ier &= ~MDM_UL;
1123 writew(dc->last_ier, dc->reg_ier);
1124 if (send_data(port, dc)) {
1125 writew(MDM_UL2, dc->reg_fcr);
1126 dc->last_ier = dc->last_ier | MDM_UL;
1127 writew(dc->last_ier, dc->reg_ier);
1131 if (read_iir & MDM_UL1) {
1132 dc->last_ier &= ~MDM_UL;
1133 writew(dc->last_ier, dc->reg_ier);
1134 if (send_data(port, dc)) {
1135 writew(MDM_UL1, dc->reg_fcr);
1136 dc->last_ier = dc->last_ier | MDM_UL;
1137 writew(dc->last_ier, dc->reg_ier);
1142 writew(read_iir & MDM_UL, dc->reg_fcr);
1143 dev_err(&dc->pdev->dev, "port out of sync!\n");
1149 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1151 struct nozomi *dc = dev_id;
1158 spin_lock(&dc->spin_mutex);
1159 read_iir = readw(dc->reg_iir);
1162 if (read_iir == (u16)-1)
1165 * Just handle interrupt enabled in IER
1166 * (by masking with dc->last_ier)
1168 read_iir &= dc->last_ier;
1174 DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1177 if (read_iir & RESET) {
1178 if (unlikely(!nozomi_read_config_table(dc))) {
1180 writew(dc->last_ier, dc->reg_ier);
1181 dev_err(&dc->pdev->dev, "Could not read status from "
1182 "card, we should disable interface\n");
1184 writew(RESET, dc->reg_fcr);
1186 /* No more useful info if this was the reset interrupt. */
1189 if (read_iir & CTRL_UL) {
1191 dc->last_ier &= ~CTRL_UL;
1192 writew(dc->last_ier, dc->reg_ier);
1193 if (send_flow_control(dc)) {
1194 writew(CTRL_UL, dc->reg_fcr);
1195 dc->last_ier = dc->last_ier | CTRL_UL;
1196 writew(dc->last_ier, dc->reg_ier);
1199 if (read_iir & CTRL_DL) {
1200 receive_flow_control(dc);
1201 writew(CTRL_DL, dc->reg_fcr);
1203 if (read_iir & MDM_DL) {
1204 if (!handle_data_dl(dc, PORT_MDM,
1205 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1206 MDM_DL1, MDM_DL2)) {
1207 dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1211 if (read_iir & MDM_UL) {
1212 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1213 dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1217 if (read_iir & DIAG_DL) {
1218 if (!handle_data_dl(dc, PORT_DIAG,
1219 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1220 DIAG_DL1, DIAG_DL2)) {
1221 dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1225 if (read_iir & DIAG_UL) {
1226 dc->last_ier &= ~DIAG_UL;
1227 writew(dc->last_ier, dc->reg_ier);
1228 if (send_data(PORT_DIAG, dc)) {
1229 writew(DIAG_UL, dc->reg_fcr);
1230 dc->last_ier = dc->last_ier | DIAG_UL;
1231 writew(dc->last_ier, dc->reg_ier);
1234 if (read_iir & APP1_DL) {
1235 if (receive_data(PORT_APP1, dc))
1236 writew(APP1_DL, dc->reg_fcr);
1238 if (read_iir & APP1_UL) {
1239 dc->last_ier &= ~APP1_UL;
1240 writew(dc->last_ier, dc->reg_ier);
1241 if (send_data(PORT_APP1, dc)) {
1242 writew(APP1_UL, dc->reg_fcr);
1243 dc->last_ier = dc->last_ier | APP1_UL;
1244 writew(dc->last_ier, dc->reg_ier);
1247 if (read_iir & APP2_DL) {
1248 if (receive_data(PORT_APP2, dc))
1249 writew(APP2_DL, dc->reg_fcr);
1251 if (read_iir & APP2_UL) {
1252 dc->last_ier &= ~APP2_UL;
1253 writew(dc->last_ier, dc->reg_ier);
1254 if (send_data(PORT_APP2, dc)) {
1255 writew(APP2_UL, dc->reg_fcr);
1256 dc->last_ier = dc->last_ier | APP2_UL;
1257 writew(dc->last_ier, dc->reg_ier);
1262 spin_unlock(&dc->spin_mutex);
1263 for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1264 if (test_and_clear_bit(a, &dc->flip))
1265 tty_flip_buffer_push(dc->port[a].tty);
1268 spin_unlock(&dc->spin_mutex);
1272 static void nozomi_get_card_type(struct nozomi *dc)
1277 for (i = 0; i < 6; i++)
1278 size += pci_resource_len(dc->pdev, i);
1280 /* Assume card type F32_8 if no match */
1281 dc->card_type = size == 2048 ? F32_2 : F32_8;
1283 dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1286 static void nozomi_setup_private_data(struct nozomi *dc)
1288 void __iomem *offset = dc->base_addr + dc->card_type / 2;
1291 dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1292 dc->reg_iir = (void __iomem *)(offset + R_IIR);
1293 dc->reg_ier = (void __iomem *)(offset + R_IER);
1297 dc->port[PORT_MDM].token_dl = MDM_DL;
1298 dc->port[PORT_DIAG].token_dl = DIAG_DL;
1299 dc->port[PORT_APP1].token_dl = APP1_DL;
1300 dc->port[PORT_APP2].token_dl = APP2_DL;
1302 for (i = 0; i < MAX_PORT; i++)
1303 init_waitqueue_head(&dc->port[i].tty_wait);
1306 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1309 struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1311 return sprintf(buf, "%d\n", dc->card_type);
1313 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1315 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1318 struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1320 return sprintf(buf, "%u\n", dc->open_ttys);
1322 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1324 static void make_sysfs_files(struct nozomi *dc)
1326 if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1327 dev_err(&dc->pdev->dev,
1328 "Could not create sysfs file for card_type\n");
1329 if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1330 dev_err(&dc->pdev->dev,
1331 "Could not create sysfs file for open_ttys\n");
1334 static void remove_sysfs_files(struct nozomi *dc)
1336 device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1337 device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1340 /* Allocate memory for one device */
1341 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1342 const struct pci_device_id *ent)
1344 resource_size_t start;
1346 struct nozomi *dc = NULL;
1350 dev_dbg(&pdev->dev, "Init, new card found\n");
1352 for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1353 if (!ndevs[ndev_idx])
1356 if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1357 dev_err(&pdev->dev, "no free tty range for this card left\n");
1362 dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1363 if (unlikely(!dc)) {
1364 dev_err(&pdev->dev, "Could not allocate memory\n");
1371 /* Find out what card type it is */
1372 nozomi_get_card_type(dc);
1374 ret = pci_enable_device(dc->pdev);
1376 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1380 start = pci_resource_start(dc->pdev, 0);
1382 dev_err(&pdev->dev, "No I/O address for card detected\n");
1384 goto err_disable_device;
1387 ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1389 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1390 (int) /* nozomi_private.io_addr */ 0);
1391 goto err_disable_device;
1394 dc->base_addr = ioremap(start, dc->card_type);
1395 if (!dc->base_addr) {
1396 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1401 dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1402 if (!dc->send_buf) {
1403 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1408 spin_lock_init(&dc->spin_mutex);
1410 nozomi_setup_private_data(dc);
1412 /* Disable all interrupts */
1414 writew(dc->last_ier, dc->reg_ier);
1416 ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1418 if (unlikely(ret)) {
1419 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1423 DBG1("base_addr: %p", dc->base_addr);
1425 make_sysfs_files(dc);
1427 dc->index_start = ndev_idx * MAX_PORT;
1428 ndevs[ndev_idx] = dc;
1430 for (i = 0; i < MAX_PORT; i++) {
1431 mutex_init(&dc->port[i].tty_sem);
1432 dc->port[i].tty_open_count = 0;
1433 dc->port[i].tty = NULL;
1434 tty_register_device(ntty_driver, dc->index_start + i,
1438 /* Enable RESET interrupt. */
1439 dc->last_ier = RESET;
1440 writew(dc->last_ier, dc->reg_ier);
1442 pci_set_drvdata(pdev, dc);
1447 kfree(dc->send_buf);
1448 iounmap(dc->base_addr);
1450 pci_release_regions(pdev);
1452 pci_disable_device(pdev);
1459 static void __devexit tty_exit(struct nozomi *dc)
1465 flush_scheduled_work();
1467 for (i = 0; i < MAX_PORT; ++i)
1468 if (dc->port[i].tty && \
1469 list_empty(&dc->port[i].tty->hangup_work.entry))
1470 tty_hangup(dc->port[i].tty);
1472 while (dc->open_ttys)
1475 for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1476 tty_unregister_device(ntty_driver, i);
1479 /* Deallocate memory for one device */
1480 static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1483 struct ctrl_ul ctrl;
1484 struct nozomi *dc = pci_get_drvdata(pdev);
1486 /* Disable all interrupts */
1488 writew(dc->last_ier, dc->reg_ier);
1492 /* Send 0x0001, command card to resend the reset token. */
1493 /* This is to get the reset when the module is reloaded. */
1498 DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1500 /* Setup dc->reg addresses to we can use defines here */
1501 write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1502 writew(CTRL_UL, dc->reg_fcr); /* push the token to the card. */
1504 remove_sysfs_files(dc);
1506 free_irq(pdev->irq, dc);
1508 for (i = 0; i < MAX_PORT; i++)
1509 if (dc->port[i].fifo_ul)
1510 kfifo_free(dc->port[i].fifo_ul);
1512 kfree(dc->send_buf);
1514 iounmap(dc->base_addr);
1516 pci_release_regions(pdev);
1518 pci_disable_device(pdev);
1520 ndevs[dc->index_start / MAX_PORT] = NULL;
1525 static void set_rts(const struct tty_struct *tty, int rts)
1527 struct port *port = get_port_by_tty(tty);
1529 port->ctrl_ul.RTS = rts;
1530 port->update_flow_control = 1;
1531 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1534 static void set_dtr(const struct tty_struct *tty, int dtr)
1536 struct port *port = get_port_by_tty(tty);
1538 DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1540 port->ctrl_ul.DTR = dtr;
1541 port->update_flow_control = 1;
1542 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1546 * ----------------------------------------------------------------------------
1548 * ----------------------------------------------------------------------------
1551 /* Called when the userspace process opens the tty, /dev/noz*. */
1552 static int ntty_open(struct tty_struct *tty, struct file *file)
1554 struct port *port = get_port_by_tty(tty);
1555 struct nozomi *dc = get_dc_by_tty(tty);
1556 unsigned long flags;
1561 if (mutex_lock_interruptible(&port->tty_sem))
1562 return -ERESTARTSYS;
1564 port->tty_open_count++;
1567 /* Enable interrupt downlink for channel */
1568 if (port->tty_open_count == 1) {
1569 tty->low_latency = 1;
1570 tty->driver_data = port;
1572 DBG1("open: %d", port->token_dl);
1573 spin_lock_irqsave(&dc->spin_mutex, flags);
1574 dc->last_ier = dc->last_ier | port->token_dl;
1575 writew(dc->last_ier, dc->reg_ier);
1576 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1579 mutex_unlock(&port->tty_sem);
1584 /* Called when the userspace process close the tty, /dev/noz*. */
1585 static void ntty_close(struct tty_struct *tty, struct file *file)
1587 struct nozomi *dc = get_dc_by_tty(tty);
1588 struct port *port = tty->driver_data;
1589 unsigned long flags;
1594 if (mutex_lock_interruptible(&port->tty_sem))
1597 if (!port->tty_open_count)
1601 port->tty_open_count--;
1603 if (port->tty_open_count == 0) {
1604 DBG1("close: %d", port->token_dl);
1605 spin_lock_irqsave(&dc->spin_mutex, flags);
1606 dc->last_ier &= ~(port->token_dl);
1607 writew(dc->last_ier, dc->reg_ier);
1608 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1612 mutex_unlock(&port->tty_sem);
1616 * called when the userspace process writes to the tty (/dev/noz*).
1617 * Data is inserted into a fifo, which is then read and transfered to the modem.
1619 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1623 struct nozomi *dc = get_dc_by_tty(tty);
1624 struct port *port = tty->driver_data;
1625 unsigned long flags;
1627 /* DBG1( "WRITEx: %d, index = %d", count, index); */
1632 if (unlikely(!mutex_trylock(&port->tty_sem))) {
1634 * must test lock as tty layer wraps calls
1635 * to this function with BKL
1637 dev_err(&dc->pdev->dev, "Would have deadlocked - "
1642 if (unlikely(!port->tty_open_count)) {
1647 rval = __kfifo_put(port->fifo_ul, (unsigned char *)buffer, count);
1650 if (unlikely(dc == NULL)) {
1651 DBG1("No device context?");
1655 spin_lock_irqsave(&dc->spin_mutex, flags);
1656 /* CTS is only valid on the modem channel */
1657 if (port == &(dc->port[PORT_MDM])) {
1658 if (port->ctrl_dl.CTS) {
1659 DBG4("Enable interrupt");
1660 enable_transmit_ul(tty->index % MAX_PORT, dc);
1662 dev_err(&dc->pdev->dev,
1663 "CTS not active on modem port?\n");
1666 enable_transmit_ul(tty->index % MAX_PORT, dc);
1668 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1671 mutex_unlock(&port->tty_sem);
1676 * Calculate how much is left in device
1677 * This method is called by the upper tty layer.
1678 * #according to sources N_TTY.c it expects a value >= 0 and
1679 * does not check for negative values.
1681 static int ntty_write_room(struct tty_struct *tty)
1683 struct port *port = tty->driver_data;
1685 struct nozomi *dc = get_dc_by_tty(tty);
1689 if (!mutex_trylock(&port->tty_sem))
1692 if (!port->tty_open_count)
1695 room = port->fifo_ul->size - __kfifo_len(port->fifo_ul);
1698 mutex_unlock(&port->tty_sem);
1702 /* Gets io control parameters */
1703 static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
1705 struct port *port = tty->driver_data;
1706 struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1707 struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1709 return (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1710 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1711 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1712 (ctrl_dl->RI ? TIOCM_RNG : 0) |
1713 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1714 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1717 /* Sets io controls parameters */
1718 static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
1719 unsigned int set, unsigned int clear)
1721 if (set & TIOCM_RTS)
1723 else if (clear & TIOCM_RTS)
1726 if (set & TIOCM_DTR)
1728 else if (clear & TIOCM_DTR)
1734 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1735 struct async_icount *cprev)
1737 struct async_icount cnow = port->tty_icount;
1740 ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1741 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1742 ((flags & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1743 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1750 static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
1752 struct async_icount cnow = port->tty_icount;
1753 struct serial_icounter_struct icount;
1755 icount.cts = cnow.cts;
1756 icount.dsr = cnow.dsr;
1757 icount.rng = cnow.rng;
1758 icount.dcd = cnow.dcd;
1759 icount.rx = cnow.rx;
1760 icount.tx = cnow.tx;
1761 icount.frame = cnow.frame;
1762 icount.overrun = cnow.overrun;
1763 icount.parity = cnow.parity;
1764 icount.brk = cnow.brk;
1765 icount.buf_overrun = cnow.buf_overrun;
1767 return copy_to_user(argp, &icount, sizeof(icount));
1770 static int ntty_ioctl(struct tty_struct *tty, struct file *file,
1771 unsigned int cmd, unsigned long arg)
1773 struct port *port = tty->driver_data;
1774 void __user *argp = (void __user *)arg;
1775 int rval = -ENOIOCTLCMD;
1777 DBG1("******** IOCTL, cmd: %d", cmd);
1781 struct async_icount cprev = port->tty_icount;
1783 rval = wait_event_interruptible(port->tty_wait,
1784 ntty_cflags_changed(port, arg, &cprev));
1787 rval = ntty_ioctl_tiocgicount(port, argp);
1790 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1798 * Called by the upper tty layer when tty buffers are ready
1799 * to receive data again after a call to throttle.
1801 static void ntty_unthrottle(struct tty_struct *tty)
1803 struct nozomi *dc = get_dc_by_tty(tty);
1804 unsigned long flags;
1807 spin_lock_irqsave(&dc->spin_mutex, flags);
1808 enable_transmit_dl(tty->index % MAX_PORT, dc);
1811 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1815 * Called by the upper tty layer when the tty buffers are almost full.
1816 * The driver should stop send more data.
1818 static void ntty_throttle(struct tty_struct *tty)
1820 struct nozomi *dc = get_dc_by_tty(tty);
1821 unsigned long flags;
1824 spin_lock_irqsave(&dc->spin_mutex, flags);
1826 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1829 /* just to discard single character writes */
1830 static void ntty_put_char(struct tty_struct *tty, unsigned char c)
1833 * card does not react correct when we write single chars
1834 * to the card, so we discard them
1836 DBG2("PUT CHAR Function: %c", c);
1839 /* Returns number of chars in buffer, called by tty layer */
1840 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1842 struct port *port = tty->driver_data;
1843 struct nozomi *dc = get_dc_by_tty(tty);
1846 if (unlikely(!dc || !port)) {
1848 goto exit_in_buffer;
1851 if (unlikely(!port->tty_open_count)) {
1852 dev_err(&dc->pdev->dev, "No tty open?\n");
1854 goto exit_in_buffer;
1857 rval = __kfifo_len(port->fifo_ul);
1863 static struct tty_operations tty_ops = {
1864 .ioctl = ntty_ioctl,
1866 .close = ntty_close,
1867 .write = ntty_write,
1868 .write_room = ntty_write_room,
1869 .unthrottle = ntty_unthrottle,
1870 .throttle = ntty_throttle,
1871 .chars_in_buffer = ntty_chars_in_buffer,
1872 .put_char = ntty_put_char,
1873 .tiocmget = ntty_tiocmget,
1874 .tiocmset = ntty_tiocmset,
1877 /* Module initialization */
1878 static struct pci_driver nozomi_driver = {
1879 .name = NOZOMI_NAME,
1880 .id_table = nozomi_pci_tbl,
1881 .probe = nozomi_card_init,
1882 .remove = __devexit_p(nozomi_card_exit),
1885 static __init int nozomi_init(void)
1889 printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1891 ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1895 ntty_driver->owner = THIS_MODULE;
1896 ntty_driver->driver_name = NOZOMI_NAME_TTY;
1897 ntty_driver->name = "noz";
1898 ntty_driver->major = 0;
1899 ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1900 ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1901 ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1902 ntty_driver->init_termios = tty_std_termios;
1903 ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1905 ntty_driver->init_termios.c_ispeed = 115200;
1906 ntty_driver->init_termios.c_ospeed = 115200;
1907 tty_set_operations(ntty_driver, &tty_ops);
1909 ret = tty_register_driver(ntty_driver);
1911 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1915 ret = pci_register_driver(&nozomi_driver);
1917 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1923 tty_unregister_driver(ntty_driver);
1925 put_tty_driver(ntty_driver);
1929 static __exit void nozomi_exit(void)
1931 printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1932 pci_unregister_driver(&nozomi_driver);
1933 tty_unregister_driver(ntty_driver);
1934 put_tty_driver(ntty_driver);
1937 module_init(nozomi_init);
1938 module_exit(nozomi_exit);
1940 module_param(debug, int, S_IRUGO | S_IWUSR);
1942 MODULE_LICENSE("Dual BSD/GPL");
1943 MODULE_DESCRIPTION(DRIVER_DESC);