[linux.git] / drivers / mfd / lpc_sch.c

/*
 *  lpc_sch.c - LPC interface for Intel Poulsbo SCH
 *
 *  LPC bridge function of the Intel SCH contains many other
 *  functional units, such as Interrupt controllers, Timers,
 *  Power Management, System Management, GPIO, RTC, and LPC
 *  Configuration Registers.
 *
 *  Copyright (c) 2010 CompuLab Ltd
 *  Author: Denis Turischev <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License 2 as published
 *  by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; 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; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/mfd/core.h>

#define SMBASE		0x40
#define SMBUS_IO_SIZE	64

#define GPIOBASE	0x44
#define GPIO_IO_SIZE	64

#define WDTBASE		0x84
#define WDT_IO_SIZE	64

static struct resource smbus_sch_resource = {
		.flags = IORESOURCE_IO,
};


static struct resource gpio_sch_resource = {
		.flags = IORESOURCE_IO,
};

static struct mfd_cell lpc_sch_cells[] = {
	{
		.name = "isch_smbus",
		.num_resources = 1,
		.resources = &smbus_sch_resource,
	},
	{
		.name = "sch_gpio",
		.num_resources = 1,
		.resources = &gpio_sch_resource,
	},
};

static struct resource wdt_sch_resource = {
		.flags = IORESOURCE_IO,
};

static struct mfd_cell tunnelcreek_cells[] = {
	{
		.name = "tunnelcreek_wdt",
		.num_resources = 1,
		.resources = &wdt_sch_resource,
	},
};

static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, lpc_sch_ids);

static int __devinit lpc_sch_probe(struct pci_dev *dev,
				const struct pci_device_id *id)
{
	unsigned int base_addr_cfg;
	unsigned short base_addr;
	int i;
	int ret;

	pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
	if (!(base_addr_cfg & (1 << 31))) {
		dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
		return -ENODEV;
	}
	base_addr = (unsigned short)base_addr_cfg;
	if (base_addr == 0) {
		dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
		return -ENODEV;
	}

	smbus_sch_resource.start = base_addr;
	smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;

	pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
	if (!(base_addr_cfg & (1 << 31))) {
		dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
		return -ENODEV;
	}
	base_addr = (unsigned short)base_addr_cfg;
	if (base_addr == 0) {
		dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
		return -ENODEV;
	}

	gpio_sch_resource.start = base_addr;
	gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;

	for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
		lpc_sch_cells[i].id = id->device;

	ret = mfd_add_devices(&dev->dev, 0,
			lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
	if (ret)
		goto out_dev;

	if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC) {
		pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
		if (!(base_addr_cfg & (1 << 31))) {
			dev_err(&dev->dev, "Decode of the WDT I/O range disabled\n");
			ret = -ENODEV;
			goto out_dev;
		}
		base_addr = (unsigned short)base_addr_cfg;
		if (base_addr == 0) {
			dev_err(&dev->dev, "I/O space for WDT uninitialized\n");
			ret = -ENODEV;
			goto out_dev;
		}

		wdt_sch_resource.start = base_addr;
		wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;

		for (i = 0; i < ARRAY_SIZE(tunnelcreek_cells); i++)
			tunnelcreek_cells[i].id = id->device;

		ret = mfd_add_devices(&dev->dev, 0, tunnelcreek_cells,
			ARRAY_SIZE(tunnelcreek_cells), NULL, 0);
	}

	return ret;
out_dev:
	mfd_remove_devices(&dev->dev);
	return ret;
}

static void __devexit lpc_sch_remove(struct pci_dev *dev)
{
	mfd_remove_devices(&dev->dev);
}

static struct pci_driver lpc_sch_driver = {
	.name		= "lpc_sch",
	.id_table	= lpc_sch_ids,
	.probe		= lpc_sch_probe,
	.remove		= __devexit_p(lpc_sch_remove),
};

static int __init lpc_sch_init(void)
{
	return pci_register_driver(&lpc_sch_driver);
}

static void __exit lpc_sch_exit(void)
{
	pci_unregister_driver(&lpc_sch_driver);
}

module_init(lpc_sch_init);
module_exit(lpc_sch_exit);

MODULE_AUTHOR("Denis Turischev <[email protected]>");
MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
MODULE_LICENSE("GPL");
Commit	Line	Data
e82c60ae DT	1	/*
	2	* lpc_sch.c - LPC interface for Intel Poulsbo SCH
	3	*
	4	* LPC bridge function of the Intel SCH contains many other
	5	* functional units, such as Interrupt controllers, Timers,
	6	* Power Management, System Management, GPIO, RTC, and LPC
	7	* Configuration Registers.
	8	*
	9	* Copyright (c) 2010 CompuLab Ltd
	10	* Author: Denis Turischev <[email protected]>
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License 2 as published
	14	* by the Free Software Foundation.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; see the file COPYING. If not, write to
	23	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
	26	#include <linux/init.h>
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
	29	#include <linux/errno.h>
	30	#include <linux/acpi.h>
	31	#include <linux/pci.h>
	32	#include <linux/mfd/core.h>
	33
	34	#define SMBASE 0x40
	35	#define SMBUS_IO_SIZE 64
	36
	37	#define GPIOBASE 0x44
	38	#define GPIO_IO_SIZE 64
	39
19921ef6 AS	40	#define WDTBASE 0x84
	41	#define WDT_IO_SIZE 64
	42
e82c60ae DT	43	static struct resource smbus_sch_resource = {
	44	.flags = IORESOURCE_IO,
	45	};
	46
	47
	48	static struct resource gpio_sch_resource = {
	49	.flags = IORESOURCE_IO,
	50	};
	51
	52	static struct mfd_cell lpc_sch_cells[] = {
	53	{
	54	.name = "isch_smbus",
	55	.num_resources = 1,
	56	.resources = &smbus_sch_resource,
	57	},
	58	{
	59	.name = "sch_gpio",
	60	.num_resources = 1,
	61	.resources = &gpio_sch_resource,
	62	},
	63	};
	64
19921ef6 AS	65	static struct resource wdt_sch_resource = {
	66	.flags = IORESOURCE_IO,
	67	};
	68
	69	static struct mfd_cell tunnelcreek_cells[] = {
	70	{
	71	.name = "tunnelcreek_wdt",
	72	.num_resources = 1,
	73	.resources = &wdt_sch_resource,
	74	},
	75	};
	76
61485c63	77	static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
e82c60ae	78	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
e967f77d	79	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
e82c60ae DT	80	{ 0, }
	81	};
	82	MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
	83
	84	static int __devinit lpc_sch_probe(struct pci_dev *dev,
	85	const struct pci_device_id *id)
	86	{
	87	unsigned int base_addr_cfg;
	88	unsigned short base_addr;
e967f77d	89	int i;
19921ef6	90	int ret;
e82c60ae DT	91
	92	pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
	93	if (!(base_addr_cfg & (1 << 31))) {
	94	dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
	95	return -ENODEV;
	96	}
	97	base_addr = (unsigned short)base_addr_cfg;
	98	if (base_addr == 0) {
	99	dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
	100	return -ENODEV;
	101	}
	102
	103	smbus_sch_resource.start = base_addr;
	104	smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
	105
	106	pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
	107	if (!(base_addr_cfg & (1 << 31))) {
	108	dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
	109	return -ENODEV;
	110	}
	111	base_addr = (unsigned short)base_addr_cfg;
	112	if (base_addr == 0) {
	113	dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
	114	return -ENODEV;
	115	}
	116
	117	gpio_sch_resource.start = base_addr;
	118	gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
	119
e967f77d DT	120	for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
	121	lpc_sch_cells[i].id = id->device;
	122
19921ef6	123	ret = mfd_add_devices(&dev->dev, 0,
e82c60ae	124	lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
19921ef6 AS	125	if (ret)
	126	goto out_dev;
	127
	128	if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC) {
	129	pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
	130	if (!(base_addr_cfg & (1 << 31))) {
	131	dev_err(&dev->dev, "Decode of the WDT I/O range disabled\n");
	132	ret = -ENODEV;
	133	goto out_dev;
	134	}
	135	base_addr = (unsigned short)base_addr_cfg;
	136	if (base_addr == 0) {
	137	dev_err(&dev->dev, "I/O space for WDT uninitialized\n");
	138	ret = -ENODEV;
	139	goto out_dev;
	140	}
	141
	142	wdt_sch_resource.start = base_addr;
	143	wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
	144
	145	for (i = 0; i < ARRAY_SIZE(tunnelcreek_cells); i++)
	146	tunnelcreek_cells[i].id = id->device;
	147
	148	ret = mfd_add_devices(&dev->dev, 0, tunnelcreek_cells,
	149	ARRAY_SIZE(tunnelcreek_cells), NULL, 0);
	150	}
	151
	152	return ret;
	153	out_dev:
	154	mfd_remove_devices(&dev->dev);
	155	return ret;
e82c60ae DT	156	}
	157
	158	static void __devexit lpc_sch_remove(struct pci_dev *dev)
	159	{
	160	mfd_remove_devices(&dev->dev);
	161	}
	162
	163	static struct pci_driver lpc_sch_driver = {
	164	.name = "lpc_sch",
	165	.id_table = lpc_sch_ids,
	166	.probe = lpc_sch_probe,
	167	.remove = __devexit_p(lpc_sch_remove),
	168	};
	169
	170	static int __init lpc_sch_init(void)
	171	{
	172	return pci_register_driver(&lpc_sch_driver);
	173	}
	174
	175	static void __exit lpc_sch_exit(void)
	176	{
	177	pci_unregister_driver(&lpc_sch_driver);
	178	}
	179
	180	module_init(lpc_sch_init);
	181	module_exit(lpc_sch_exit);
	182
	183	MODULE_AUTHOR("Denis Turischev <[email protected]>");
	184	MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
	185	MODULE_LICENSE("GPL");