// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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.
*/
#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 const 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 const struct pci_device_id 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");
