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ubuntu-linux-kernel/drivers/tty/serial/jsm/jsm_driver.c

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2024-04-01 15:06:58 +00:00
// SPDX-License-Identifier: GPL-2.0+
/************************************************************************
* Copyright 2003 Digi International (www.digi.com)
*
* Copyright (C) 2004 IBM Corporation. All rights reserved.
*
* Contact Information:
* Scott H Kilau <Scott_Kilau@digi.com>
* Wendy Xiong <wendyx@us.ibm.com>
*
*
***********************************************************************/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include "jsm.h"
MODULE_AUTHOR("Digi International, http://www.digi.com");
MODULE_DESCRIPTION("Driver for the Digi International Neo and Classic PCI based product line");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("jsm");
#define JSM_DRIVER_NAME "jsm"
#define NR_PORTS 32
#define JSM_MINOR_START 0
struct uart_driver jsm_uart_driver = {
.owner = THIS_MODULE,
.driver_name = JSM_DRIVER_NAME,
.dev_name = "ttyn",
.major = 0,
.minor = JSM_MINOR_START,
.nr = NR_PORTS,
};
static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
pci_channel_state_t state);
static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev);
static void jsm_io_resume(struct pci_dev *pdev);
static const struct pci_error_handlers jsm_err_handler = {
.error_detected = jsm_io_error_detected,
.slot_reset = jsm_io_slot_reset,
.resume = jsm_io_resume,
};
int jsm_debug;
module_param(jsm_debug, int, 0);
MODULE_PARM_DESC(jsm_debug, "Driver debugging level");
static int jsm_probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int rc = 0;
struct jsm_board *brd;
static int adapter_count;
rc = pci_enable_device(pdev);
if (rc) {
dev_err(&pdev->dev, "Device enable FAILED\n");
goto out;
}
rc = pci_request_regions(pdev, JSM_DRIVER_NAME);
if (rc) {
dev_err(&pdev->dev, "pci_request_region FAILED\n");
goto out_disable_device;
}
brd = kzalloc(sizeof(*brd), GFP_KERNEL);
if (!brd) {
rc = -ENOMEM;
goto out_release_regions;
}
/* store the info for the board we've found */
brd->boardnum = adapter_count++;
brd->pci_dev = pdev;
switch (pdev->device) {
case PCI_DEVICE_ID_NEO_2DB9:
case PCI_DEVICE_ID_NEO_2DB9PRI:
case PCI_DEVICE_ID_NEO_2RJ45:
case PCI_DEVICE_ID_NEO_2RJ45PRI:
case PCI_DEVICE_ID_NEO_2_422_485:
brd->maxports = 2;
break;
case PCI_DEVICE_ID_CLASSIC_4:
case PCI_DEVICE_ID_CLASSIC_4_422:
case PCI_DEVICE_ID_NEO_4:
case PCIE_DEVICE_ID_NEO_4:
case PCIE_DEVICE_ID_NEO_4RJ45:
case PCIE_DEVICE_ID_NEO_4_IBM:
brd->maxports = 4;
break;
case PCI_DEVICE_ID_CLASSIC_8:
case PCI_DEVICE_ID_CLASSIC_8_422:
case PCI_DEVICE_ID_DIGI_NEO_8:
case PCIE_DEVICE_ID_NEO_8:
case PCIE_DEVICE_ID_NEO_8RJ45:
brd->maxports = 8;
break;
default:
brd->maxports = 1;
break;
}
spin_lock_init(&brd->bd_intr_lock);
/* store which revision we have */
brd->rev = pdev->revision;
brd->irq = pdev->irq;
switch (pdev->device) {
case PCI_DEVICE_ID_CLASSIC_4:
case PCI_DEVICE_ID_CLASSIC_4_422:
case PCI_DEVICE_ID_CLASSIC_8:
case PCI_DEVICE_ID_CLASSIC_8_422:
jsm_dbg(INIT, &brd->pci_dev,
"jsm_found_board - Classic adapter\n");
/*
* 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
*/
/* Get the PCI Base Address Registers */
brd->membase = pci_resource_start(pdev, 4);
brd->membase_end = pci_resource_end(pdev, 4);
if (brd->membase & 0x1)
brd->membase &= ~0x3;
else
brd->membase &= ~0xF;
brd->iobase = pci_resource_start(pdev, 1);
brd->iobase_end = pci_resource_end(pdev, 1);
brd->iobase = ((unsigned int)(brd->iobase)) & 0xFFFE;
/* Assign the board_ops struct */
brd->bd_ops = &jsm_cls_ops;
brd->bd_uart_offset = 0x8;
brd->bd_dividend = 921600;
brd->re_map_membase = ioremap(brd->membase,
pci_resource_len(pdev, 4));
if (!brd->re_map_membase) {
dev_err(&pdev->dev,
"Card has no PCI Memory resources, failing board.\n");
rc = -ENOMEM;
goto out_kfree_brd;
}
/*
* Enable Local Interrupt 1 (0x1),
* Local Interrupt 1 Polarity Active high (0x2),
* Enable PCI interrupt (0x43)
*/
outb(0x43, brd->iobase + 0x4c);
break;
case PCI_DEVICE_ID_NEO_2DB9:
case PCI_DEVICE_ID_NEO_2DB9PRI:
case PCI_DEVICE_ID_NEO_2RJ45:
case PCI_DEVICE_ID_NEO_2RJ45PRI:
case PCI_DEVICE_ID_NEO_2_422_485:
case PCI_DEVICE_ID_NEO_4:
case PCIE_DEVICE_ID_NEO_4:
case PCIE_DEVICE_ID_NEO_4RJ45:
case PCIE_DEVICE_ID_NEO_4_IBM:
case PCI_DEVICE_ID_DIGI_NEO_8:
case PCIE_DEVICE_ID_NEO_8:
case PCIE_DEVICE_ID_NEO_8RJ45:
jsm_dbg(INIT, &brd->pci_dev, "jsm_found_board - NEO adapter\n");
/* get the PCI Base Address Registers */
brd->membase = pci_resource_start(pdev, 0);
brd->membase_end = pci_resource_end(pdev, 0);
if (brd->membase & 1)
brd->membase &= ~0x3;
else
brd->membase &= ~0xF;
/* Assign the board_ops struct */
brd->bd_ops = &jsm_neo_ops;
brd->bd_uart_offset = 0x200;
brd->bd_dividend = 921600;
brd->re_map_membase = ioremap(brd->membase,
pci_resource_len(pdev, 0));
if (!brd->re_map_membase) {
dev_err(&pdev->dev,
"Card has no PCI Memory resources, failing board.\n");
rc = -ENOMEM;
goto out_kfree_brd;
}
break;
default:
return -ENXIO;
}
rc = request_irq(brd->irq, brd->bd_ops->intr, IRQF_SHARED, "JSM", brd);
if (rc) {
dev_warn(&pdev->dev, "Failed to hook IRQ %d\n", brd->irq);
goto out_iounmap;
}
rc = jsm_tty_init(brd);
if (rc < 0) {
dev_err(&pdev->dev, "Can't init tty devices (%d)\n", rc);
rc = -ENXIO;
goto out_free_irq;
}
rc = jsm_uart_port_init(brd);
if (rc < 0) {
/* XXX: leaking all resources from jsm_tty_init here! */
dev_err(&pdev->dev, "Can't init uart port (%d)\n", rc);
rc = -ENXIO;
goto out_free_irq;
}
/* Log the information about the board */
dev_info(&pdev->dev, "board %d: Digi Classic/Neo (rev %d), irq %d\n",
adapter_count, brd->rev, brd->irq);
pci_set_drvdata(pdev, brd);
pci_save_state(pdev);
return 0;
out_free_irq:
jsm_remove_uart_port(brd);
free_irq(brd->irq, brd);
out_iounmap:
iounmap(brd->re_map_membase);
out_kfree_brd:
kfree(brd);
out_release_regions:
pci_release_regions(pdev);
out_disable_device:
pci_disable_device(pdev);
out:
return rc;
}
static void jsm_remove_one(struct pci_dev *pdev)
{
struct jsm_board *brd = pci_get_drvdata(pdev);
int i = 0;
switch (pdev->device) {
case PCI_DEVICE_ID_CLASSIC_4:
case PCI_DEVICE_ID_CLASSIC_4_422:
case PCI_DEVICE_ID_CLASSIC_8:
case PCI_DEVICE_ID_CLASSIC_8_422:
/* Tell card not to interrupt anymore. */
outb(0x0, brd->iobase + 0x4c);
break;
default:
break;
}
jsm_remove_uart_port(brd);
free_irq(brd->irq, brd);
iounmap(brd->re_map_membase);
/* Free all allocated channels structs */
for (i = 0; i < brd->maxports; i++) {
if (brd->channels[i]) {
kfree(brd->channels[i]->ch_rqueue);
kfree(brd->channels[i]->ch_equeue);
kfree(brd->channels[i]);
}
}
pci_release_regions(pdev);
pci_disable_device(pdev);
kfree(brd);
}
static const struct pci_device_id jsm_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9), 0, 0, 0 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI), 0, 0, 1 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45), 0, 0, 2 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45PRI), 0, 0, 3 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4_IBM), 0, 0, 4 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_DIGI_NEO_8), 0, 0, 5 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_4), 0, 0, 6 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_1_422), 0, 0, 7 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_1_422_485), 0, 0, 8 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2_422_485), 0, 0, 9 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_8), 0, 0, 10 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4), 0, 0, 11 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4RJ45), 0, 0, 12 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_8RJ45), 0, 0, 13 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_CLASSIC_4), 0, 0, 14 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_CLASSIC_4_422), 0, 0, 15 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_CLASSIC_8), 0, 0, 16 },
{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_CLASSIC_8_422), 0, 0, 17 },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);
static struct pci_driver jsm_driver = {
.name = JSM_DRIVER_NAME,
.id_table = jsm_pci_tbl,
.probe = jsm_probe_one,
.remove = jsm_remove_one,
.err_handler = &jsm_err_handler,
};
static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
pci_channel_state_t state)
{
struct jsm_board *brd = pci_get_drvdata(pdev);
jsm_remove_uart_port(brd);
return PCI_ERS_RESULT_NEED_RESET;
}
static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
{
int rc;
rc = pci_enable_device(pdev);
if (rc)
return PCI_ERS_RESULT_DISCONNECT;
pci_set_master(pdev);
return PCI_ERS_RESULT_RECOVERED;
}
static void jsm_io_resume(struct pci_dev *pdev)
{
struct jsm_board *brd = pci_get_drvdata(pdev);
pci_restore_state(pdev);
pci_save_state(pdev);
jsm_uart_port_init(brd);
}
static int __init jsm_init_module(void)
{
int rc;
rc = uart_register_driver(&jsm_uart_driver);
if (!rc) {
rc = pci_register_driver(&jsm_driver);
if (rc)
uart_unregister_driver(&jsm_uart_driver);
}
return rc;
}
static void __exit jsm_exit_module(void)
{
pci_unregister_driver(&jsm_driver);
uart_unregister_driver(&jsm_uart_driver);
}
module_init(jsm_init_module);
module_exit(jsm_exit_module);