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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2003 Digi International (www.digi.com)
* Scott H Kilau <Scott_Kilau at digi dot com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include "dgnc_driver.h"
#include "dgnc_tty.h"
#include "dgnc_cls.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Digi International, http://www.digi.com");
MODULE_DESCRIPTION("Driver for the Digi International Neo and Classic PCI based product line");
MODULE_SUPPORTED_DEVICE("dgnc");
static unsigned int dgnc_num_boards;
struct dgnc_board *dgnc_board[MAXBOARDS];
static DEFINE_SPINLOCK(dgnc_poll_lock); /* Poll scheduling lock */
static int dgnc_poll_tick = 20; /* Poll interval - 20 ms */
static ulong dgnc_poll_time; /* Time of next poll */
static uint dgnc_poll_stop; /* Used to tell poller to stop */
static struct timer_list dgnc_poll_timer;
#define DIGI_VID 0x114F
#define PCI_DEVICE_CLASSIC_4_DID 0x0028
#define PCI_DEVICE_CLASSIC_8_DID 0x0029
#define PCI_DEVICE_CLASSIC_4_422_DID 0x00D0
#define PCI_DEVICE_CLASSIC_8_422_DID 0x00D1
#define PCI_DEVICE_CLASSIC_4_PCI_NAME "ClassicBoard 4 PCI"
#define PCI_DEVICE_CLASSIC_8_PCI_NAME "ClassicBoard 8 PCI"
#define PCI_DEVICE_CLASSIC_4_422_PCI_NAME "ClassicBoard 4 422 PCI"
#define PCI_DEVICE_CLASSIC_8_422_PCI_NAME "ClassicBoard 8 422 PCI"
static const struct pci_device_id dgnc_pci_tbl[] = {
{PCI_DEVICE(DIGI_VID, PCI_DEVICE_CLASSIC_4_DID), .driver_data = 0},
{PCI_DEVICE(DIGI_VID, PCI_DEVICE_CLASSIC_4_422_DID), .driver_data = 1},
{PCI_DEVICE(DIGI_VID, PCI_DEVICE_CLASSIC_8_DID), .driver_data = 2},
{PCI_DEVICE(DIGI_VID, PCI_DEVICE_CLASSIC_8_422_DID), .driver_data = 3},
{0,}
};
MODULE_DEVICE_TABLE(pci, dgnc_pci_tbl);
struct board_id {
unsigned char *name;
uint maxports;
unsigned int is_pci_express;
};
static const struct board_id dgnc_ids[] = {
{ PCI_DEVICE_CLASSIC_4_PCI_NAME, 4, 0 },
{ PCI_DEVICE_CLASSIC_4_422_PCI_NAME, 4, 0 },
{ PCI_DEVICE_CLASSIC_8_PCI_NAME, 8, 0 },
{ PCI_DEVICE_CLASSIC_8_422_PCI_NAME, 8, 0 },
{ NULL, 0, 0 }
};
/* Remap PCI memory. */
static int dgnc_do_remap(struct dgnc_board *brd)
{
brd->re_map_membase = ioremap(brd->membase, 0x1000);
if (!brd->re_map_membase)
return -ENOMEM;
return 0;
}
/* A board has been found, initialize it. */
static struct dgnc_board *dgnc_found_board(struct pci_dev *pdev, int id)
{
struct dgnc_board *brd;
unsigned int pci_irq;
int rc = 0;
brd = kzalloc(sizeof(*brd), GFP_KERNEL);
if (!brd)
return ERR_PTR(-ENOMEM);
/* store the info for the board we've found */
brd->boardnum = dgnc_num_boards;
brd->device = dgnc_pci_tbl[id].device;
brd->pdev = pdev;
brd->name = dgnc_ids[id].name;
brd->maxports = dgnc_ids[id].maxports;
init_waitqueue_head(&brd->state_wait);
spin_lock_init(&brd->bd_lock);
spin_lock_init(&brd->bd_intr_lock);
brd->state = BOARD_FOUND;
pci_irq = pdev->irq;
brd->irq = pci_irq;
switch (brd->device) {
case PCI_DEVICE_CLASSIC_4_DID:
case PCI_DEVICE_CLASSIC_8_DID:
case PCI_DEVICE_CLASSIC_4_422_DID:
case PCI_DEVICE_CLASSIC_8_422_DID:
/*
* For PCI ClassicBoards
* PCI Local Address (i.e. "resource" number) space
* 0 PLX Memory Mapped Config
* 1 PLX I/O Mapped Config
* 2 I/O Mapped UARTs and Status
* 3 Memory Mapped VPD
* 4 Memory Mapped UARTs and Status
*/
brd->membase = pci_resource_start(pdev, 4);
if (!brd->membase) {
dev_err(&brd->pdev->dev,
"Card has no PCI IO resources, failing.\n");
rc = -ENODEV;
goto failed;
}
brd->membase_end = pci_resource_end(pdev, 4);
if (brd->membase & 1)
brd->membase &= ~3;
else
brd->membase &= ~15;
brd->iobase = pci_resource_start(pdev, 1);
brd->iobase_end = pci_resource_end(pdev, 1);
brd->iobase = ((unsigned int)(brd->iobase)) & 0xFFFE;
brd->bd_ops = &dgnc_cls_ops;
brd->bd_uart_offset = 0x8;
brd->bd_dividend = 921600;
rc = dgnc_do_remap(brd);
if (rc < 0)
goto failed;
/* Get and store the board VPD, if it exists */
brd->bd_ops->vpd(brd);
/*
* Enable Local Interrupt 1 (0x1),
* Local Interrupt 1 Polarity Active high (0x2),
* Enable PCI interrupt (0x40)
*/
outb(0x43, brd->iobase + 0x4c);
break;
default:
dev_err(&brd->pdev->dev,
"Didn't find any compatible Neo/Classic PCI boards.\n");
rc = -ENXIO;
goto failed;
}
tasklet_init(&brd->helper_tasklet,
brd->bd_ops->tasklet,
(unsigned long)brd);
wake_up_interruptible(&brd->state_wait);
return brd;
failed:
kfree(brd);
return ERR_PTR(rc);
}
static int dgnc_request_irq(struct dgnc_board *brd)
{
if (brd->irq) {
int rc = request_irq(brd->irq, brd->bd_ops->intr,
IRQF_SHARED, "DGNC", brd);
if (rc) {
dev_err(&brd->pdev->dev,
"Failed to hook IRQ %d\n", brd->irq);
brd->state = BOARD_FAILED;
return -ENODEV;
}
}
return 0;
}
static void dgnc_free_irq(struct dgnc_board *brd)
{
if (brd->irq)
free_irq(brd->irq, brd);
}
/*
* As each timer expires, it determines (a) whether the "transmit"
* waiter needs to be woken up, and (b) whether the poller needs to
* be rescheduled.
*/
static void dgnc_poll_handler(struct timer_list *unused)
{
struct dgnc_board *brd;
unsigned long flags;
int i;
unsigned long new_time;
for (i = 0; i < dgnc_num_boards; i++) {
brd = dgnc_board[i];
spin_lock_irqsave(&brd->bd_lock, flags);
if (brd->state == BOARD_FAILED) {
spin_unlock_irqrestore(&brd->bd_lock, flags);
continue;
}
tasklet_schedule(&brd->helper_tasklet);
spin_unlock_irqrestore(&brd->bd_lock, flags);
}
/* Schedule ourself back at the nominal wakeup interval. */
spin_lock_irqsave(&dgnc_poll_lock, flags);
dgnc_poll_time += dgnc_jiffies_from_ms(dgnc_poll_tick);
new_time = dgnc_poll_time - jiffies;
if ((ulong)new_time >= 2 * dgnc_poll_tick)
dgnc_poll_time = jiffies + dgnc_jiffies_from_ms(dgnc_poll_tick);
timer_setup(&dgnc_poll_timer, dgnc_poll_handler, 0);
dgnc_poll_timer.expires = dgnc_poll_time;
spin_unlock_irqrestore(&dgnc_poll_lock, flags);
if (!dgnc_poll_stop)
add_timer(&dgnc_poll_timer);
}
/* returns count (>= 0), or negative on error */
static int dgnc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int rc;
struct dgnc_board *brd;
rc = pci_enable_device(pdev);
if (rc)
return -EIO;
brd = dgnc_found_board(pdev, ent->driver_data);
if (IS_ERR(brd))
return PTR_ERR(brd);
rc = dgnc_tty_register(brd);
if (rc < 0) {
pr_err(DRVSTR ": Can't register tty devices (%d)\n", rc);
goto failed;
}
rc = dgnc_request_irq(brd);
if (rc < 0) {
pr_err(DRVSTR ": Can't finalize board init (%d)\n", rc);
goto unregister_tty;
}
rc = dgnc_tty_init(brd);
if (rc < 0) {
pr_err(DRVSTR ": Can't init tty devices (%d)\n", rc);
goto free_irq;
}
brd->state = BOARD_READY;
dgnc_board[dgnc_num_boards++] = brd;
return 0;
free_irq:
dgnc_free_irq(brd);
unregister_tty:
dgnc_tty_unregister(brd);
failed:
kfree(brd);
return rc;
}
static struct pci_driver dgnc_driver = {
.name = "dgnc",
.probe = dgnc_init_one,
.id_table = dgnc_pci_tbl,
};
static int dgnc_start(void)
{
unsigned long flags;
/* Start the poller */
spin_lock_irqsave(&dgnc_poll_lock, flags);
timer_setup(&dgnc_poll_timer, dgnc_poll_handler, 0);
dgnc_poll_time = jiffies + dgnc_jiffies_from_ms(dgnc_poll_tick);
dgnc_poll_timer.expires = dgnc_poll_time;
spin_unlock_irqrestore(&dgnc_poll_lock, flags);
add_timer(&dgnc_poll_timer);
return 0;
}
/* Free all the memory associated with a board */
static void dgnc_cleanup_board(struct dgnc_board *brd)
{
int i = 0;
if (!brd)
return;
switch (brd->device) {
case PCI_DEVICE_CLASSIC_4_DID:
case PCI_DEVICE_CLASSIC_8_DID:
case PCI_DEVICE_CLASSIC_4_422_DID:
case PCI_DEVICE_CLASSIC_8_422_DID:
/* Tell card not to interrupt anymore. */
outb(0, brd->iobase + 0x4c);
break;
default:
break;
}
if (brd->irq)
free_irq(brd->irq, brd);
tasklet_kill(&brd->helper_tasklet);
if (brd->re_map_membase) {
iounmap(brd->re_map_membase);
brd->re_map_membase = NULL;
}
for (i = 0; i < MAXPORTS ; i++) {
if (brd->channels[i]) {
kfree(brd->channels[i]->ch_rqueue);
kfree(brd->channels[i]->ch_equeue);
kfree(brd->channels[i]->ch_wqueue);
kfree(brd->channels[i]);
brd->channels[i] = NULL;
}
}
dgnc_board[brd->boardnum] = NULL;
kfree(brd);
}
/* Driver load/unload functions */
static void cleanup(void)
{
int i;
unsigned long flags;
spin_lock_irqsave(&dgnc_poll_lock, flags);
dgnc_poll_stop = 1;
spin_unlock_irqrestore(&dgnc_poll_lock, flags);
/* Turn off poller right away. */
del_timer_sync(&dgnc_poll_timer);
for (i = 0; i < dgnc_num_boards; ++i) {
dgnc_cleanup_tty(dgnc_board[i]);
dgnc_cleanup_board(dgnc_board[i]);
}
}
static void __exit dgnc_cleanup_module(void)
{
cleanup();
pci_unregister_driver(&dgnc_driver);
}
static int __init dgnc_init_module(void)
{
int rc;
/* Initialize global stuff */
rc = dgnc_start();
if (rc < 0)
return rc;
/* Find and configure all the cards */
rc = pci_register_driver(&dgnc_driver);
if (rc) {
pr_warn("WARNING: dgnc driver load failed. No Digi Neo or Classic boards found.\n");
cleanup();
return rc;
}
return 0;
}
module_init(dgnc_init_module);
module_exit(dgnc_cleanup_module);
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