drivers/pci/hotplug/cpcihp_zt5550.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * cpcihp_zt5550.c
  *
  * Intel/Ziatech ZT5550 CompactPCI Host Controller driver
  *
  * Copyright 2002 SOMA Networks, Inc.
  * Copyright 2001 Intel San Luis Obispo
  * Copyright 2000,2001 MontaVista Software Inc.
  *
  * Send feedback to <scottm@somanetworks.com>
  */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/signal.h>	/* IRQF_SHARED */
 #include "cpci_hotplug.h"
 #include "cpcihp_zt5550.h"

 #define DRIVER_VERSION	"0.2"
 #define DRIVER_AUTHOR	"Scott Murray <scottm@somanetworks.com>"
 #define DRIVER_DESC	"ZT5550 CompactPCI Hot Plug Driver"

 #define MY_NAME	"cpcihp_zt5550"

 #define dbg(format, arg...)					\
 	do {							\
 		if (debug)					\
 			printk(KERN_DEBUG "%s: " format "\n",	\
 				MY_NAME, ## arg);		\
 	} while (0)
 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME, ## arg)
 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME, ## arg)
 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME, ## arg)

 /* local variables */
 static bool debug;
 static bool poll;
 static struct cpci_hp_controller_ops zt5550_hpc_ops;
 static struct cpci_hp_controller zt5550_hpc;

 /* Primary cPCI bus bridge device */
 static struct pci_dev *bus0_dev;
 static struct pci_bus *bus0;

 /* Host controller device */
 static struct pci_dev *hc_dev;

 /* Host controller register addresses */
 static void __iomem *hc_registers;
 static void __iomem *csr_hc_index;
 static void __iomem *csr_hc_data;
 static void __iomem *csr_int_status;
 static void __iomem *csr_int_mask;


 static int zt5550_hc_config(struct pci_dev *pdev)
 {
 	int ret;

 	/* Since we know that no boards exist with two HC chips, treat it as an error */
 	if (hc_dev) {
 		err("too many host controller devices?");
 		return -EBUSY;
 	}

 	ret = pci_enable_device(pdev);
 	if (ret) {
 		err("cannot enable %s\n", pci_name(pdev));
 		return ret;
 	}

 	hc_dev = pdev;
 	dbg("hc_dev = %p", hc_dev);
 	dbg("pci resource start %llx", (unsigned long long)pci_resource_start(hc_dev, 1));
 	dbg("pci resource len %llx", (unsigned long long)pci_resource_len(hc_dev, 1));

 	if (!request_mem_region(pci_resource_start(hc_dev, 1),
 				pci_resource_len(hc_dev, 1), MY_NAME)) {
 		err("cannot reserve MMIO region");
 		ret = -ENOMEM;
 		goto exit_disable_device;
 	}

 	hc_registers =
 	    ioremap(pci_resource_start(hc_dev, 1), pci_resource_len(hc_dev, 1));
 	if (!hc_registers) {
 		err("cannot remap MMIO region %llx @ %llx",
 			(unsigned long long)pci_resource_len(hc_dev, 1),
 			(unsigned long long)pci_resource_start(hc_dev, 1));
 		ret = -ENODEV;
 		goto exit_release_region;
 	}

 	csr_hc_index = hc_registers + CSR_HCINDEX;
 	csr_hc_data = hc_registers + CSR_HCDATA;
 	csr_int_status = hc_registers + CSR_INTSTAT;
 	csr_int_mask = hc_registers + CSR_INTMASK;

 	/*
 	 * Disable host control, fault and serial interrupts
 	 */
 	dbg("disabling host control, fault and serial interrupts");
 	writeb((u8) HC_INT_MASK_REG, csr_hc_index);
 	writeb((u8) ALL_INDEXED_INTS_MASK, csr_hc_data);
 	dbg("disabled host control, fault and serial interrupts");

 	/*
 	 * Disable timer0, timer1 and ENUM interrupts
 	 */
 	dbg("disabling timer0, timer1 and ENUM interrupts");
 	writeb((u8) ALL_DIRECT_INTS_MASK, csr_int_mask);
 	dbg("disabled timer0, timer1 and ENUM interrupts");
 	return 0;

 exit_release_region:
 	release_mem_region(pci_resource_start(hc_dev, 1),
 			   pci_resource_len(hc_dev, 1));
 exit_disable_device:
 	pci_disable_device(hc_dev);
 	return ret;
 }

 static int zt5550_hc_cleanup(void)
 {
 	if (!hc_dev)
 		return -ENODEV;

 	iounmap(hc_registers);
 	release_mem_region(pci_resource_start(hc_dev, 1),
 			   pci_resource_len(hc_dev, 1));
 	pci_disable_device(hc_dev);
 	return 0;
 }

 static int zt5550_hc_query_enum(void)
 {
 	u8 value;

 	value = inb_p(ENUM_PORT);
 	return ((value & ENUM_MASK) == ENUM_MASK);
 }

 static int zt5550_hc_check_irq(void *dev_id)
 {
 	int ret;
 	u8 reg;

 	ret = 0;
 	if (dev_id == zt5550_hpc.dev_id) {
 		reg = readb(csr_int_status);
 		if (reg)
 			ret = 1;
 	}
 	return ret;
 }

 static int zt5550_hc_enable_irq(void)
 {
 	u8 reg;

 	if (hc_dev == NULL)
 		return -ENODEV;

 	reg = readb(csr_int_mask);
 	reg = reg & ~ENUM_INT_MASK;
 	writeb(reg, csr_int_mask);
 	return 0;
 }

 static int zt5550_hc_disable_irq(void)
 {
 	u8 reg;

 	if (hc_dev == NULL)
 		return -ENODEV;

 	reg = readb(csr_int_mask);
 	reg = reg | ENUM_INT_MASK;
 	writeb(reg, csr_int_mask);
 	return 0;
 }

 static int zt5550_hc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	int status;

 	status = zt5550_hc_config(pdev);
 	if (status != 0)
 		return status;

 	dbg("returned from zt5550_hc_config");

 	memset(&zt5550_hpc, 0, sizeof(struct cpci_hp_controller));
 	zt5550_hpc_ops.query_enum = zt5550_hc_query_enum;
 	zt5550_hpc.ops = &zt5550_hpc_ops;
 	if (!poll) {
 		zt5550_hpc.irq = hc_dev->irq;
 		zt5550_hpc.irq_flags = IRQF_SHARED;
 		zt5550_hpc.dev_id = hc_dev;

 		zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq;
 		zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq;
 		zt5550_hpc_ops.check_irq = zt5550_hc_check_irq;
 	} else {
 		info("using ENUM# polling mode");
 	}

 	status = cpci_hp_register_controller(&zt5550_hpc);
 	if (status != 0) {
 		err("could not register cPCI hotplug controller");
 		goto init_hc_error;
 	}
 	dbg("registered controller");

 	/* Look for first device matching cPCI bus's bridge vendor and device IDs */
 	bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
 				  PCI_DEVICE_ID_DEC_21154, NULL);
 	if (!bus0_dev) {
 		status = -ENODEV;
 		goto init_register_error;
 	}
 	bus0 = bus0_dev->subordinate;
 	pci_dev_put(bus0_dev);

 	status = cpci_hp_register_bus(bus0, 0x0a, 0x0f);
 	if (status != 0) {
 		err("could not register cPCI hotplug bus");
 		goto init_register_error;
 	}
 	dbg("registered bus");

 	status = cpci_hp_start();
 	if (status != 0) {
 		err("could not started cPCI hotplug system");
 		cpci_hp_unregister_bus(bus0);
 		goto init_register_error;
 	}
 	dbg("started cpci hp system");

 	return 0;
 init_register_error:
 	cpci_hp_unregister_controller(&zt5550_hpc);
 init_hc_error:
 	err("status = %d", status);
 	zt5550_hc_cleanup();
 	return status;

 }

 static void zt5550_hc_remove_one(struct pci_dev *pdev)
 {
 	cpci_hp_stop();
 	cpci_hp_unregister_bus(bus0);
 	cpci_hp_unregister_controller(&zt5550_hpc);
 	zt5550_hc_cleanup();
 }


 static const struct pci_device_id zt5550_hc_pci_tbl[] = {
 	{ PCI_VENDOR_ID_ZIATECH, PCI_DEVICE_ID_ZIATECH_5550_HC, PCI_ANY_ID, PCI_ANY_ID, },
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl);

 static struct pci_driver zt5550_hc_driver = {
 	.name		= "zt5550_hc",
 	.id_table	= zt5550_hc_pci_tbl,
 	.probe		= zt5550_hc_init_one,
 	.remove		= zt5550_hc_remove_one,
 };

 static int __init zt5550_init(void)
 {
 	struct resource *r;
 	int rc;

 	info(DRIVER_DESC " version: " DRIVER_VERSION);
 	r = request_region(ENUM_PORT, 1, "#ENUM hotswap signal register");
 	if (!r)
 		return -EBUSY;

 	rc = pci_register_driver(&zt5550_hc_driver);
 	if (rc < 0)
 		release_region(ENUM_PORT, 1);
 	return rc;
 }

 static void __exit
 zt5550_exit(void)
 {
 	pci_unregister_driver(&zt5550_hc_driver);
 	release_region(ENUM_PORT, 1);
 }

 module_init(zt5550_init);
 module_exit(zt5550_exit);

 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
 module_param(debug, bool, 0644);
 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
 module_param(poll, bool, 0644);
 MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* cpcihp_zt5550.c
	*
	* Intel/Ziatech ZT5550 CompactPCI Host Controller driver
	*
	* Copyright 2002 SOMA Networks, Inc.
	* Copyright 2001 Intel San Luis Obispo
	* Copyright 2000,2001 MontaVista Software Inc.
	*
	* Send feedback to <scottm@somanetworks.com>
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#include <linux/errno.h>
	#include <linux/pci.h>
	#include <linux/interrupt.h>
	#include <linux/signal.h> /* IRQF_SHARED */
	#include "cpci_hotplug.h"
	#include "cpcihp_zt5550.h"

	#define DRIVER_VERSION "0.2"
	#define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
	#define DRIVER_DESC "ZT5550 CompactPCI Hot Plug Driver"

	#define MY_NAME "cpcihp_zt5550"

	#define dbg(format, arg...) \
	do { \
	if (debug) \
	printk(KERN_DEBUG "%s: " format "\n", \
	MY_NAME, ## arg); \
	} while (0)
	#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME, ## arg)
	#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME, ## arg)
	#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME, ## arg)

	/* local variables */
	static bool debug;
	static bool poll;
	static struct cpci_hp_controller_ops zt5550_hpc_ops;
	static struct cpci_hp_controller zt5550_hpc;

	/* Primary cPCI bus bridge device */
	static struct pci_dev *bus0_dev;
	static struct pci_bus *bus0;

	/* Host controller device */
	static struct pci_dev *hc_dev;

	/* Host controller register addresses */
	static void __iomem *hc_registers;
	static void __iomem *csr_hc_index;
	static void __iomem *csr_hc_data;
	static void __iomem *csr_int_status;
	static void __iomem *csr_int_mask;


	static int zt5550_hc_config(struct pci_dev *pdev)
	{
	int ret;

	/* Since we know that no boards exist with two HC chips, treat it as an error */
	if (hc_dev) {
	err("too many host controller devices?");
	return -EBUSY;
	}

	ret = pci_enable_device(pdev);
	if (ret) {
	err("cannot enable %s\n", pci_name(pdev));
	return ret;
	}

	hc_dev = pdev;
	dbg("hc_dev = %p", hc_dev);
	dbg("pci resource start %llx", (unsigned long long)pci_resource_start(hc_dev, 1));
	dbg("pci resource len %llx", (unsigned long long)pci_resource_len(hc_dev, 1));

	if (!request_mem_region(pci_resource_start(hc_dev, 1),
	pci_resource_len(hc_dev, 1), MY_NAME)) {
	err("cannot reserve MMIO region");
	ret = -ENOMEM;
	goto exit_disable_device;
	}

	hc_registers =
	ioremap(pci_resource_start(hc_dev, 1), pci_resource_len(hc_dev, 1));
	if (!hc_registers) {
	err("cannot remap MMIO region %llx @ %llx",
	(unsigned long long)pci_resource_len(hc_dev, 1),
	(unsigned long long)pci_resource_start(hc_dev, 1));
	ret = -ENODEV;
	goto exit_release_region;
	}

	csr_hc_index = hc_registers + CSR_HCINDEX;
	csr_hc_data = hc_registers + CSR_HCDATA;
	csr_int_status = hc_registers + CSR_INTSTAT;
	csr_int_mask = hc_registers + CSR_INTMASK;

	/*
	* Disable host control, fault and serial interrupts
	*/
	dbg("disabling host control, fault and serial interrupts");
	writeb((u8) HC_INT_MASK_REG, csr_hc_index);
	writeb((u8) ALL_INDEXED_INTS_MASK, csr_hc_data);
	dbg("disabled host control, fault and serial interrupts");

	/*
	* Disable timer0, timer1 and ENUM interrupts
	*/
	dbg("disabling timer0, timer1 and ENUM interrupts");
	writeb((u8) ALL_DIRECT_INTS_MASK, csr_int_mask);
	dbg("disabled timer0, timer1 and ENUM interrupts");
	return 0;

	exit_release_region:
	release_mem_region(pci_resource_start(hc_dev, 1),
	pci_resource_len(hc_dev, 1));
	exit_disable_device:
	pci_disable_device(hc_dev);
	return ret;
	}

	static int zt5550_hc_cleanup(void)
	{
	if (!hc_dev)
	return -ENODEV;

	iounmap(hc_registers);
	release_mem_region(pci_resource_start(hc_dev, 1),
	pci_resource_len(hc_dev, 1));
	pci_disable_device(hc_dev);
	return 0;
	}

	static int zt5550_hc_query_enum(void)
	{
	u8 value;

	value = inb_p(ENUM_PORT);
	return ((value & ENUM_MASK) == ENUM_MASK);
	}

	static int zt5550_hc_check_irq(void *dev_id)
	{
	int ret;
	u8 reg;

	ret = 0;
	if (dev_id == zt5550_hpc.dev_id) {
	reg = readb(csr_int_status);
	if (reg)
	ret = 1;
	}
	return ret;
	}

	static int zt5550_hc_enable_irq(void)
	{
	u8 reg;

	if (hc_dev == NULL)
	return -ENODEV;

	reg = readb(csr_int_mask);
	reg = reg & ~ENUM_INT_MASK;
	writeb(reg, csr_int_mask);
	return 0;
	}

	static int zt5550_hc_disable_irq(void)
	{
	u8 reg;

	if (hc_dev == NULL)
	return -ENODEV;

	reg = readb(csr_int_mask);
	reg = reg \| ENUM_INT_MASK;
	writeb(reg, csr_int_mask);
	return 0;
	}

	static int zt5550_hc_init_one(struct pci_dev pdev, const struct pci_device_id ent)
	{
	int status;

	status = zt5550_hc_config(pdev);
	if (status != 0)
	return status;

	dbg("returned from zt5550_hc_config");

	memset(&zt5550_hpc, 0, sizeof(struct cpci_hp_controller));
	zt5550_hpc_ops.query_enum = zt5550_hc_query_enum;
	zt5550_hpc.ops = &zt5550_hpc_ops;
	if (!poll) {
	zt5550_hpc.irq = hc_dev->irq;
	zt5550_hpc.irq_flags = IRQF_SHARED;
	zt5550_hpc.dev_id = hc_dev;

	zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq;
	zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq;
	zt5550_hpc_ops.check_irq = zt5550_hc_check_irq;
	} else {
	info("using ENUM# polling mode");
	}

	status = cpci_hp_register_controller(&zt5550_hpc);
	if (status != 0) {
	err("could not register cPCI hotplug controller");
	goto init_hc_error;
	}
	dbg("registered controller");

	/* Look for first device matching cPCI bus's bridge vendor and device IDs */
	bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
	PCI_DEVICE_ID_DEC_21154, NULL);
	if (!bus0_dev) {
	status = -ENODEV;
	goto init_register_error;
	}
	bus0 = bus0_dev->subordinate;
	pci_dev_put(bus0_dev);

	status = cpci_hp_register_bus(bus0, 0x0a, 0x0f);
	if (status != 0) {
	err("could not register cPCI hotplug bus");
	goto init_register_error;
	}
	dbg("registered bus");

	status = cpci_hp_start();
	if (status != 0) {
	err("could not started cPCI hotplug system");
	cpci_hp_unregister_bus(bus0);
	goto init_register_error;
	}
	dbg("started cpci hp system");

	return 0;
	init_register_error:
	cpci_hp_unregister_controller(&zt5550_hpc);
	init_hc_error:
	err("status = %d", status);
	zt5550_hc_cleanup();
	return status;

	}

	static void zt5550_hc_remove_one(struct pci_dev *pdev)
	{
	cpci_hp_stop();
	cpci_hp_unregister_bus(bus0);
	cpci_hp_unregister_controller(&zt5550_hpc);
	zt5550_hc_cleanup();
	}


	static const struct pci_device_id zt5550_hc_pci_tbl[] = {
	{ PCI_VENDOR_ID_ZIATECH, PCI_DEVICE_ID_ZIATECH_5550_HC, PCI_ANY_ID, PCI_ANY_ID, },
	{ 0, }
	};
	MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl);

	static struct pci_driver zt5550_hc_driver = {
	.name = "zt5550_hc",
	.id_table = zt5550_hc_pci_tbl,
	.probe = zt5550_hc_init_one,
	.remove = zt5550_hc_remove_one,
	};

	static int __init zt5550_init(void)
	{
	struct resource *r;
	int rc;

	info(DRIVER_DESC " version: " DRIVER_VERSION);
	r = request_region(ENUM_PORT, 1, "#ENUM hotswap signal register");
	if (!r)
	return -EBUSY;

	rc = pci_register_driver(&zt5550_hc_driver);
	if (rc < 0)
	release_region(ENUM_PORT, 1);
	return rc;
	}

	static void __exit
	zt5550_exit(void)
	{
	pci_unregister_driver(&zt5550_hc_driver);
	release_region(ENUM_PORT, 1);
	}

	module_init(zt5550_init);
	module_exit(zt5550_exit);

	MODULE_AUTHOR(DRIVER_AUTHOR);
	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_LICENSE("GPL");
	module_param(debug, bool, 0644);
	MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
	module_param(poll, bool, 0644);
	MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not");