drivers/serial/jsm/jsm_driver.c - kernel/skids - Git at Google

 /************************************************************************
  * Copyright 2003 Digi International (www.digi.com)
  *
  * Copyright (C) 2004 IBM Corporation. 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, or (at your option)
  * any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; 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., 59 * Temple Place - Suite 330, Boston,
  * MA  02111-1307, USA.
  *
  * Contact Information:
  * Scott H Kilau <Scott_Kilau@digi.com>
  * Wendy Xiong   <wendyx@us.ibm.com>
  *
  *
  ***********************************************************************/
 #include <linux/moduleparam.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 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 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 __devinit jsm_probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	int rc = 0;
 	struct jsm_board *brd;
 	static int adapter_count = 0;

 	rc = pci_enable_device(pdev);
 	if (rc) {
 		dev_err(&pdev->dev, "Device enable FAILED\n");
 		goto out;
 	}

 	rc = pci_request_regions(pdev, "jsm");
 	if (rc) {
 		dev_err(&pdev->dev, "pci_request_region FAILED\n");
 		goto out_disable_device;
 	}

 	brd = kzalloc(sizeof(struct jsm_board), GFP_KERNEL);
 	if (!brd) {
 		dev_err(&pdev->dev,
 			"memory allocation for board structure failed\n");
 		rc = -ENOMEM;
 		goto out_release_regions;
 	}

 	/* store the info for the board we've found */
 	brd->boardnum = adapter_count++;
 	brd->pci_dev = pdev;
 	if (pdev->device == PCIE_DEVICE_ID_NEO_4_IBM)
 		brd->maxports = 4;
 	else if (pdev->device == PCI_DEVICE_ID_DIGI_NEO_8)
 		brd->maxports = 8;
 	else
 		brd->maxports = 2;

 	spin_lock_init(&brd->bd_intr_lock);

 	/* store which revision we have */
 	brd->rev = pdev->revision;

 	brd->irq = pdev->irq;

 	jsm_printk(INIT, INFO, &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 &= ~3;
 	else
 		brd->membase &= ~15;

 	/* 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, 0x1000);
 	if (!brd->re_map_membase) {
 		dev_err(&pdev->dev,
 			"card has no PCI Memory resources, "
 			"failing board.\n");
 		rc = -ENOMEM;
 		goto out_kfree_brd;
 	}

 	rc = request_irq(brd->irq, brd->bd_ops->intr,
 			IRQF_SHARED, "JSM", brd);
 	if (rc) {
 		printk(KERN_WARNING "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 Neo (rev %d), irq %d\n",
 			adapter_count, brd->rev, brd->irq);

 	/*
 	 * allocate flip buffer for board.
 	 *
 	 * Okay to malloc with GFP_KERNEL, we are not at interrupt
 	 * context, and there are no locks held.
 	 */
 	brd->flipbuf = kzalloc(MYFLIPLEN, GFP_KERNEL);
 	if (!brd->flipbuf) {
 		/* XXX: leaking all resources from jsm_tty_init and
 		 	jsm_uart_port_init here! */
 		dev_err(&pdev->dev, "memory allocation for flipbuf failed\n");
 		rc = -ENOMEM;
 		goto out_free_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 __devexit jsm_remove_one(struct pci_dev *pdev)
 {
 	struct jsm_board *brd = pci_get_drvdata(pdev);
 	int i = 0;

 	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]->ch_wqueue);
 			kfree(brd->channels[i]);
 		}
 	}

 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
 	kfree(brd->flipbuf);
 	kfree(brd);
 }

 static 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 },
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);

 static struct pci_driver jsm_driver = {
 	.name		= "jsm",
 	.id_table	= jsm_pci_tbl,
 	.probe		= jsm_probe_one,
 	.remove		= __devexit_p(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);

 	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);
	/************************************************************************
	* Copyright 2003 Digi International (www.digi.com)
	*
	* Copyright (C) 2004 IBM Corporation. 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, or (at your option)
	* any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; 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., 59 * Temple Place - Suite 330, Boston,
	* MA 02111-1307, USA.
	*
	* Contact Information:
	* Scott H Kilau <Scott_Kilau@digi.com>
	* Wendy Xiong <wendyx@us.ibm.com>
	*
	*
	***********************************************************************/
	#include <linux/moduleparam.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 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 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 __devinit jsm_probe_one(struct pci_dev pdev, const struct pci_device_id ent)
	{
	int rc = 0;
	struct jsm_board *brd;
	static int adapter_count = 0;

	rc = pci_enable_device(pdev);
	if (rc) {
	dev_err(&pdev->dev, "Device enable FAILED\n");
	goto out;
	}

	rc = pci_request_regions(pdev, "jsm");
	if (rc) {
	dev_err(&pdev->dev, "pci_request_region FAILED\n");
	goto out_disable_device;
	}

	brd = kzalloc(sizeof(struct jsm_board), GFP_KERNEL);
	if (!brd) {
	dev_err(&pdev->dev,
	"memory allocation for board structure failed\n");
	rc = -ENOMEM;
	goto out_release_regions;
	}

	/* store the info for the board we've found */
	brd->boardnum = adapter_count++;
	brd->pci_dev = pdev;
	if (pdev->device == PCIE_DEVICE_ID_NEO_4_IBM)
	brd->maxports = 4;
	else if (pdev->device == PCI_DEVICE_ID_DIGI_NEO_8)
	brd->maxports = 8;
	else
	brd->maxports = 2;

	spin_lock_init(&brd->bd_intr_lock);

	/* store which revision we have */
	brd->rev = pdev->revision;

	brd->irq = pdev->irq;

	jsm_printk(INIT, INFO, &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 &= ~3;
	else
	brd->membase &= ~15;

	/* 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, 0x1000);
	if (!brd->re_map_membase) {
	dev_err(&pdev->dev,
	"card has no PCI Memory resources, "
	"failing board.\n");
	rc = -ENOMEM;
	goto out_kfree_brd;
	}

	rc = request_irq(brd->irq, brd->bd_ops->intr,
	IRQF_SHARED, "JSM", brd);
	if (rc) {
	printk(KERN_WARNING "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 Neo (rev %d), irq %d\n",
	adapter_count, brd->rev, brd->irq);

	/*
	* allocate flip buffer for board.
	*
	* Okay to malloc with GFP_KERNEL, we are not at interrupt
	* context, and there are no locks held.
	*/
	brd->flipbuf = kzalloc(MYFLIPLEN, GFP_KERNEL);
	if (!brd->flipbuf) {
	/* XXX: leaking all resources from jsm_tty_init and
	jsm_uart_port_init here! */
	dev_err(&pdev->dev, "memory allocation for flipbuf failed\n");
	rc = -ENOMEM;
	goto out_free_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 __devexit jsm_remove_one(struct pci_dev *pdev)
	{
	struct jsm_board *brd = pci_get_drvdata(pdev);
	int i = 0;

	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]->ch_wqueue);
	kfree(brd->channels[i]);
	}
	}

	pci_release_regions(pdev);
	pci_disable_device(pdev);
	kfree(brd->flipbuf);
	kfree(brd);
	}

	static 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 },
	{ 0, }
	};
	MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);

	static struct pci_driver jsm_driver = {
	.name = "jsm",
	.id_table = jsm_pci_tbl,
	.probe = jsm_probe_one,
	.remove = __devexit_p(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);

	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);