148 строки
4.0 KiB
C
148 строки
4.0 KiB
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 __devinit 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);
|
|
|
|
/* 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 struct pci_device_id vx855_pci_tbl[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) },
|
|
{ 0, }
|
|
};
|
|
|
|
static struct pci_driver vx855_pci_driver = {
|
|
.name = "vx855",
|
|
.id_table = vx855_pci_tbl,
|
|
.probe = vx855_probe,
|
|
.remove = __devexit_p(vx855_remove),
|
|
};
|
|
|
|
static int vx855_init(void)
|
|
{
|
|
return pci_register_driver(&vx855_pci_driver);
|
|
}
|
|
module_init(vx855_init);
|
|
|
|
static void vx855_exit(void)
|
|
{
|
|
pci_unregister_driver(&vx855_pci_driver);
|
|
}
|
|
module_exit(vx855_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
|
|
MODULE_DESCRIPTION("Driver for the VIA VX855 chipset");
|