[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pci / pcie / portdrv_pci.c

/*
 * File:	portdrv_pci.c
 * Purpose:	PCI Express Port Bus Driver
 *
 * Copyright (C) 2004 Intel
 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/pcieport_if.h>

#include "portdrv.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.0"
#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
#define DRIVER_DESC "PCIE Port Bus Driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/* global data */
static const char device_name[] = "pcieport-driver";

static void pci_save_msi_state(struct pci_dev *dev)
{
	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
	int i = 0, pos;
	u16 control;

   	if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
		return;

	pci_read_config_dword(dev, pos, &p_ext->saved_msi_config_space[i++]);
	control = p_ext->saved_msi_config_space[0] >> 16;
	pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
		&p_ext->saved_msi_config_space[i++]);
	if (control & PCI_MSI_FLAGS_64BIT) {
		pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
			&p_ext->saved_msi_config_space[i++]);
		pci_read_config_dword(dev, pos + PCI_MSI_DATA_64,
			&p_ext->saved_msi_config_space[i++]);
	} else
		pci_read_config_dword(dev, pos + PCI_MSI_DATA_32,
			&p_ext->saved_msi_config_space[i++]);
	if (control & PCI_MSI_FLAGS_MASKBIT)
		pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT,
			&p_ext->saved_msi_config_space[i++]);
}

static void pci_restore_msi_state(struct pci_dev *dev)
{
	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
	int i = 0, pos;
	u16 control;

   	if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
		return;

	control = p_ext->saved_msi_config_space[i++] >> 16;
	pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
	pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
		p_ext->saved_msi_config_space[i++]);
	if (control & PCI_MSI_FLAGS_64BIT) {
		pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
			p_ext->saved_msi_config_space[i++]);
		pci_write_config_dword(dev, pos + PCI_MSI_DATA_64,
			p_ext->saved_msi_config_space[i++]);
	} else
		pci_write_config_dword(dev, pos + PCI_MSI_DATA_32,
			p_ext->saved_msi_config_space[i++]);
	if (control & PCI_MSI_FLAGS_MASKBIT)
		pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT,
			p_ext->saved_msi_config_space[i++]);
}

static void pcie_portdrv_save_config(struct pci_dev *dev)
{
	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);

	pci_save_state(dev);
	if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
		pci_save_msi_state(dev);
}

static void pcie_portdrv_restore_config(struct pci_dev *dev)
{
	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);

	pci_restore_state(dev);
	if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
		pci_restore_msi_state(dev);
	pci_enable_device(dev);
	pci_set_master(dev);
}

/*
 * pcie_portdrv_probe - Probe PCI-Express port devices
 * @dev: PCI-Express port device being probed
 *
 * If detected invokes the pcie_port_device_register() method for 
 * this port device.
 *
 */
static int __devinit pcie_portdrv_probe (struct pci_dev *dev, 
				const struct pci_device_id *id )
{
	int			status;

	status = pcie_port_device_probe(dev);
	if (status)
		return status;

	if (pci_enable_device(dev) < 0) 
		return -ENODEV;
	
	pci_set_master(dev);
        if (!dev->irq) {
		printk(KERN_WARNING 
		"%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n", 
		__FUNCTION__, dev->device, dev->vendor);
	}
	if (pcie_port_device_register(dev)) 
		return -ENOMEM;

	return 0;
}

static void pcie_portdrv_remove (struct pci_dev *dev)
{
	pcie_port_device_remove(dev);
	kfree(pci_get_drvdata(dev));
}

#ifdef CONFIG_PM
static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
{
	int ret = pcie_port_device_suspend(dev, state);

	pcie_portdrv_save_config(dev);
	return ret;
}

static int pcie_portdrv_resume (struct pci_dev *dev)
{
	pcie_portdrv_restore_config(dev);
	return pcie_port_device_resume(dev);
}
#endif

/*
 * LINUX Device Driver Model
 */
static const struct pci_device_id port_pci_ids[] = { {
	/* handle any PCI-Express port */
	PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
	}, { /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, port_pci_ids);

static struct pci_driver pcie_portdrv = {
	.name		= (char *)device_name,
	.id_table	= &port_pci_ids[0],

	.probe		= pcie_portdrv_probe,
	.remove		= pcie_portdrv_remove,

#ifdef	CONFIG_PM
	.suspend	= pcie_portdrv_suspend,
	.resume		= pcie_portdrv_resume,
#endif	/* PM */
};

static int __init pcie_portdrv_init(void)
{
	int retval = 0;

	pcie_port_bus_register();
	retval = pci_register_driver(&pcie_portdrv);
	if (retval)
		pcie_port_bus_unregister();
	return retval;
}

static void __exit pcie_portdrv_exit(void) 
{
	pci_unregister_driver(&pcie_portdrv);
	pcie_port_bus_unregister();
}

module_init(pcie_portdrv_init);
module_exit(pcie_portdrv_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* File: portdrv_pci.c
	3	* Purpose: PCI Express Port Bus Driver
	4	*
	5	* Copyright (C) 2004 Intel
	6	* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/pci.h>
	11	#include <linux/kernel.h>
	12	#include <linux/errno.h>
	13	#include <linux/pm.h>
	14	#include <linux/init.h>
	15	#include <linux/pcieport_if.h>
	16
	17	#include "portdrv.h"
	18
	19	/*
	20	* Version Information
	21	*/
	22	#define DRIVER_VERSION "v1.0"
	23	#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
	24	#define DRIVER_DESC "PCIE Port Bus Driver"
	25	MODULE_AUTHOR(DRIVER_AUTHOR);
	26	MODULE_DESCRIPTION(DRIVER_DESC);
	27	MODULE_LICENSE("GPL");
	28
	29	/* global data */
	30	static const char device_name[] = "pcieport-driver";
	31
5823d100	32	static void pci_save_msi_state(struct pci_dev *dev)
	33	{
	34	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
	35	int i = 0, pos;
	36	u16 control;
	37
	38	if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
	39	return;
	40
	41	pci_read_config_dword(dev, pos, &p_ext->saved_msi_config_space[i++]);
	42	control = p_ext->saved_msi_config_space[0] >> 16;
	43	pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
	44	&p_ext->saved_msi_config_space[i++]);
	45	if (control & PCI_MSI_FLAGS_64BIT) {
	46	pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
	47	&p_ext->saved_msi_config_space[i++]);
	48	pci_read_config_dword(dev, pos + PCI_MSI_DATA_64,
	49	&p_ext->saved_msi_config_space[i++]);
	50	} else
	51	pci_read_config_dword(dev, pos + PCI_MSI_DATA_32,
	52	&p_ext->saved_msi_config_space[i++]);
	53	if (control & PCI_MSI_FLAGS_MASKBIT)
	54	pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT,
	55	&p_ext->saved_msi_config_space[i++]);
	56	}
	57
	58	static void pci_restore_msi_state(struct pci_dev *dev)
	59	{
	60	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
	61	int i = 0, pos;
	62	u16 control;
	63
	64	if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
	65	return;
	66
	67	control = p_ext->saved_msi_config_space[i++] >> 16;
	68	pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
	69	pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
	70	p_ext->saved_msi_config_space[i++]);
	71	if (control & PCI_MSI_FLAGS_64BIT) {
	72	pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
	73	p_ext->saved_msi_config_space[i++]);
	74	pci_write_config_dword(dev, pos + PCI_MSI_DATA_64,
	75	p_ext->saved_msi_config_space[i++]);
	76	} else
	77	pci_write_config_dword(dev, pos + PCI_MSI_DATA_32,
	78	p_ext->saved_msi_config_space[i++]);
	79	if (control & PCI_MSI_FLAGS_MASKBIT)
	80	pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT,
	81	p_ext->saved_msi_config_space[i++]);
	82	}
	83
	84	static void pcie_portdrv_save_config(struct pci_dev *dev)
	85	{
	86	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
	87
	88	pci_save_state(dev);
	89	if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
	90	pci_save_msi_state(dev);
	91	}
	92
	93	static void pcie_portdrv_restore_config(struct pci_dev *dev)
	94	{
	95	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
96
97	pci_restore_state(dev);
98	if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
99	pci_restore_msi_state(dev);
100	pci_enable_device(dev);
101	pci_set_master(dev);
102	}
103
1da177e4 LT	104	/*
	105	* pcie_portdrv_probe - Probe PCI-Express port devices
	106	* @dev: PCI-Express port device being probed
	107	*
	108	* If detected invokes the pcie_port_device_register() method for
	109	* this port device.
	110	*
	111	*/
	112	static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
	113	const struct pci_device_id *id )
	114	{
	115	int status;
	116
	117	status = pcie_port_device_probe(dev);
	118	if (status)
	119	return status;
	120
	121	if (pci_enable_device(dev) < 0)
	122	return -ENODEV;
	123
	124	pci_set_master(dev);
	125	if (!dev->irq) {
	126	printk(KERN_WARNING
	127	"%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
	128	__FUNCTION__, dev->device, dev->vendor);
	129	}
	130	if (pcie_port_device_register(dev))
	131	return -ENOMEM;
	132
	133	return 0;
	134	}
	135
	136	static void pcie_portdrv_remove (struct pci_dev *dev)
	137	{
	138	pcie_port_device_remove(dev);
5823d100	139	kfree(pci_get_drvdata(dev));
1da177e4 LT	140	}
	141
	142	#ifdef CONFIG_PM
7f4927c1	143	static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
1da177e4	144	{
5823d100	145	int ret = pcie_port_device_suspend(dev, state);
	146
	147	pcie_portdrv_save_config(dev);
	148	return ret;
1da177e4 LT	149	}
	150
	151	static int pcie_portdrv_resume (struct pci_dev *dev)
	152	{
5823d100	153	pcie_portdrv_restore_config(dev);
1da177e4 LT	154	return pcie_port_device_resume(dev);
	155	}
	156	#endif
	157
	158	/*
	159	* LINUX Device Driver Model
	160	*/
	161	static const struct pci_device_id port_pci_ids[] = { {
	162	/* handle any PCI-Express port */
	163	PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) \| 0x00), ~0),
	164	}, { /* end: all zeroes */ }
	165	};
	166	MODULE_DEVICE_TABLE(pci, port_pci_ids);
	167
	168	static struct pci_driver pcie_portdrv = {
	169	.name = (char *)device_name,
	170	.id_table = &port_pci_ids[0],
	171
	172	.probe = pcie_portdrv_probe,
	173	.remove = pcie_portdrv_remove,
	174
	175	#ifdef CONFIG_PM
	176	.suspend = pcie_portdrv_suspend,
	177	.resume = pcie_portdrv_resume,
	178	#endif /* PM */
	179	};
	180
	181	static int __init pcie_portdrv_init(void)
	182	{
	183	int retval = 0;
	184
	185	pcie_port_bus_register();
	186	retval = pci_register_driver(&pcie_portdrv);
	187	if (retval)
	188	pcie_port_bus_unregister();
	189	return retval;
	190	}
	191
	192	static void __exit pcie_portdrv_exit(void)
	193	{
	194	pci_unregister_driver(&pcie_portdrv);
	195	pcie_port_bus_unregister();
	196	}
	197
	198	module_init(pcie_portdrv_init);
	199	module_exit(pcie_portdrv_exit);