[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mfd / vx855.c

/*
 * Linux multi-function-device driver (MFD) for the integrated peripherals
 * of the VIA VX855 chipset
 *
 * Copyright (C) 2009 VIA Technologies, Inc.
 * Copyright (C) 2010 One Laptop per Child
 * Author: Harald Welte <HaraldWelte@viatech.com>
 * 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 of
 * the License, or (at your option) any later version.
 *
 * 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; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <linux/mfd/core.h>

/* offset into pci config space indicating the 16bit register containing
 * the power management IO space base */
#define VX855_CFG_PMIO_OFFSET	0x88

/* ACPI I/O Space registers */
#define VX855_PMIO_ACPI		0x00
#define VX855_PMIO_ACPI_LEN	0x0b

/* Processor Power Management */
#define VX855_PMIO_PPM		0x10
#define VX855_PMIO_PPM_LEN	0x08

/* General Purpose Power Management */
#define VX855_PMIO_GPPM		0x20
#define VX855_PMIO_R_GPI	0x48
#define VX855_PMIO_R_GPO	0x4c
#define VX855_PMIO_GPPM_LEN	0x33

#define VSPIC_MMIO_SIZE	0x1000

static struct resource vx855_gpio_resources[] = {
	{
		.flags = IORESOURCE_IO,
	},
	{
		.flags = IORESOURCE_IO,
	},
};

static struct mfd_cell vx855_cells[] = {
	{
		.name = "vx855_gpio",
		.num_resources = ARRAY_SIZE(vx855_gpio_resources),
		.resources = vx855_gpio_resources,

		/* we must ignore resource conflicts, for reasons outlined in
		 * the vx855_gpio driver */
		.ignore_resource_conflicts = true,
	},
};

static int vx855_probe(struct pci_dev *pdev,
				 const struct pci_device_id *id)
{
	int ret;
	u16 gpio_io_offset;

	ret = pci_enable_device(pdev);
	if (ret)
		return -ENODEV;

	pci_read_config_word(pdev, VX855_CFG_PMIO_OFFSET, &gpio_io_offset);
	if (!gpio_io_offset) {
		dev_warn(&pdev->dev,
			"BIOS did not assign PMIO base offset?!?\n");
		ret = -ENODEV;
		goto out;
	}

	/* mask out the lowest seven bits, as they are always zero, but
	 * hardware returns them as 0x01 */
	gpio_io_offset &= 0xff80;

	/* As the region identified here includes many non-GPIO things, we
	 * only work with the specific registers that concern us. */
	vx855_gpio_resources[0].start = gpio_io_offset + VX855_PMIO_R_GPI;
	vx855_gpio_resources[0].end = vx855_gpio_resources[0].start + 3;
	vx855_gpio_resources[1].start = gpio_io_offset + VX855_PMIO_R_GPO;
	vx855_gpio_resources[1].end = vx855_gpio_resources[1].start + 3;

	ret = mfd_add_devices(&pdev->dev, -1, vx855_cells, ARRAY_SIZE(vx855_cells),
			NULL, 0, NULL);

	/* we always return -ENODEV here in order to enable other
	 * drivers like old, not-yet-platform_device ported i2c-viapro */
	return -ENODEV;
out:
	pci_disable_device(pdev);
	return ret;
}

static void vx855_remove(struct pci_dev *pdev)
{
	mfd_remove_devices(&pdev->dev);
	pci_disable_device(pdev);
}

static DEFINE_PCI_DEVICE_TABLE(vx855_pci_tbl) = {
	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, vx855_pci_tbl);

static struct pci_driver vx855_pci_driver = {
	.name		= "vx855",
	.id_table	= vx855_pci_tbl,
	.probe		= vx855_probe,
	.remove		= vx855_remove,
};

module_pci_driver(vx855_pci_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
MODULE_DESCRIPTION("Driver for the VIA VX855 chipset");
Commit	Line	Data
375fc77b DD	1	/*
	2	* Linux multi-function-device driver (MFD) for the integrated peripherals
	3	* of the VIA VX855 chipset
	4	*
	5	* Copyright (C) 2009 VIA Technologies, Inc.
	6	* Copyright (C) 2010 One Laptop per Child
	7	* Author: Harald Welte <HaraldWelte@viatech.com>
	8	* All rights reserved.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation; either version 2 of
	13	* the License, or (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	23	* MA 02111-1307 USA
	24	*
	25	*/
	26
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
	29	#include <linux/device.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/pci.h>
	32	#include <linux/mfd/core.h>
	33
	34	/* offset into pci config space indicating the 16bit register containing
	35	* the power management IO space base */
	36	#define VX855_CFG_PMIO_OFFSET 0x88
	37
	38	/* ACPI I/O Space registers */
	39	#define VX855_PMIO_ACPI 0x00
	40	#define VX855_PMIO_ACPI_LEN 0x0b
	41
	42	/* Processor Power Management */
	43	#define VX855_PMIO_PPM 0x10
	44	#define VX855_PMIO_PPM_LEN 0x08
	45
	46	/* General Purpose Power Management */
	47	#define VX855_PMIO_GPPM 0x20
	48	#define VX855_PMIO_R_GPI 0x48
	49	#define VX855_PMIO_R_GPO 0x4c
	50	#define VX855_PMIO_GPPM_LEN 0x33
	51
	52	#define VSPIC_MMIO_SIZE 0x1000
	53
	54	static struct resource vx855_gpio_resources[] = {
	55	{
	56	.flags = IORESOURCE_IO,
	57	},
	58	{
	59	.flags = IORESOURCE_IO,
	60	},
	61	};
	62
	63	static struct mfd_cell vx855_cells[] = {
	64	{
65	.name = "vx855_gpio",
66	.num_resources = ARRAY_SIZE(vx855_gpio_resources),
67	.resources = vx855_gpio_resources,
68
69	/* we must ignore resource conflicts, for reasons outlined in
70	* the vx855_gpio driver */
71	.ignore_resource_conflicts = true,
72	},
73	};
74
f791be49	75	static int vx855_probe(struct pci_dev *pdev,
375fc77b DD	76	const struct pci_device_id *id)
	77	{
	78	int ret;
	79	u16 gpio_io_offset;
	80
	81	ret = pci_enable_device(pdev);
	82	if (ret)
	83	return -ENODEV;
	84
	85	pci_read_config_word(pdev, VX855_CFG_PMIO_OFFSET, &gpio_io_offset);
	86	if (!gpio_io_offset) {
	87	dev_warn(&pdev->dev,
	88	"BIOS did not assign PMIO base offset?!?\n");
	89	ret = -ENODEV;
	90	goto out;
	91	}
	92
	93	/* mask out the lowest seven bits, as they are always zero, but
	94	* hardware returns them as 0x01 */
	95	gpio_io_offset &= 0xff80;
	96
	97	/* As the region identified here includes many non-GPIO things, we
	98	* only work with the specific registers that concern us. */
	99	vx855_gpio_resources[0].start = gpio_io_offset + VX855_PMIO_R_GPI;
	100	vx855_gpio_resources[0].end = vx855_gpio_resources[0].start + 3;
	101	vx855_gpio_resources[1].start = gpio_io_offset + VX855_PMIO_R_GPO;
	102	vx855_gpio_resources[1].end = vx855_gpio_resources[1].start + 3;
	103
	104	ret = mfd_add_devices(&pdev->dev, -1, vx855_cells, ARRAY_SIZE(vx855_cells),
0848c94f	105	NULL, 0, NULL);
375fc77b DD	106
	107	/* we always return -ENODEV here in order to enable other
	108	* drivers like old, not-yet-platform_device ported i2c-viapro */
	109	return -ENODEV;
	110	out:
	111	pci_disable_device(pdev);
	112	return ret;
	113	}
	114
4740f73f	115	static void vx855_remove(struct pci_dev *pdev)
375fc77b DD	116	{
	117	mfd_remove_devices(&pdev->dev);
	118	pci_disable_device(pdev);
	119	}
	120
61485c63	121	static DEFINE_PCI_DEVICE_TABLE(vx855_pci_tbl) = {
375fc77b DD	122	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) },
	123	{ 0, }
	124	};
bcd2f639	125	MODULE_DEVICE_TABLE(pci, vx855_pci_tbl);
375fc77b DD	126
	127	static struct pci_driver vx855_pci_driver = {
	128	.name = "vx855",
	129	.id_table = vx855_pci_tbl,
	130	.probe = vx855_probe,
84449216	131	.remove = vx855_remove,
375fc77b DD	132	};
375fc77b DD	133
38a36f5a	134	module_pci_driver(vx855_pci_driver);
375fc77b DD	135
	136	MODULE_LICENSE("GPL");
	137	MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
	138	MODULE_DESCRIPTION("Driver for the VIA VX855 chipset");