// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Linux multi-function-device driver (MFD) for the integrated peripherals
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* of the VIA VX855 chipset
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*
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* Copyright (C) 2009 VIA Technologies, Inc.
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* Copyright (C) 2010 One Laptop per Child
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* Author: Harald Welte <HaraldWelte@viatech.com>
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* All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/pci.h>
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#include <linux/mfd/core.h>
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/* offset into pci config space indicating the 16bit register containing
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* the power management IO space base */
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#define VX855_CFG_PMIO_OFFSET 0x88
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/* ACPI I/O Space registers */
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#define VX855_PMIO_ACPI 0x00
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#define VX855_PMIO_ACPI_LEN 0x0b
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/* Processor Power Management */
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#define VX855_PMIO_PPM 0x10
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#define VX855_PMIO_PPM_LEN 0x08
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/* General Purpose Power Management */
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#define VX855_PMIO_GPPM 0x20
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#define VX855_PMIO_R_GPI 0x48
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#define VX855_PMIO_R_GPO 0x4c
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#define VX855_PMIO_GPPM_LEN 0x33
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#define VSPIC_MMIO_SIZE 0x1000
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static struct resource vx855_gpio_resources[] = {
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{
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.flags = IORESOURCE_IO,
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},
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{
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.flags = IORESOURCE_IO,
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},
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};
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static const struct mfd_cell vx855_cells[] = {
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{
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.name = "vx855_gpio",
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.num_resources = ARRAY_SIZE(vx855_gpio_resources),
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.resources = vx855_gpio_resources,
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/* we must ignore resource conflicts, for reasons outlined in
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* the vx855_gpio driver */
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.ignore_resource_conflicts = true,
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},
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};
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static int vx855_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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int ret;
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u16 gpio_io_offset;
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ret = pci_enable_device(pdev);
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if (ret)
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return -ENODEV;
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pci_read_config_word(pdev, VX855_CFG_PMIO_OFFSET, &gpio_io_offset);
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if (!gpio_io_offset) {
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dev_warn(&pdev->dev,
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"BIOS did not assign PMIO base offset?!?\n");
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ret = -ENODEV;
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goto out;
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}
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/* mask out the lowest seven bits, as they are always zero, but
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* hardware returns them as 0x01 */
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gpio_io_offset &= 0xff80;
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/* As the region identified here includes many non-GPIO things, we
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* only work with the specific registers that concern us. */
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vx855_gpio_resources[0].start = gpio_io_offset + VX855_PMIO_R_GPI;
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vx855_gpio_resources[0].end = vx855_gpio_resources[0].start + 3;
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vx855_gpio_resources[1].start = gpio_io_offset + VX855_PMIO_R_GPO;
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vx855_gpio_resources[1].end = vx855_gpio_resources[1].start + 3;
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ret = mfd_add_devices(&pdev->dev, -1, vx855_cells, ARRAY_SIZE(vx855_cells),
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NULL, 0, NULL);
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/* we always return -ENODEV here in order to enable other
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* drivers like old, not-yet-platform_device ported i2c-viapro */
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return -ENODEV;
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out:
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pci_disable_device(pdev);
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return ret;
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}
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static void vx855_remove(struct pci_dev *pdev)
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{
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mfd_remove_devices(&pdev->dev);
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pci_disable_device(pdev);
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}
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static const struct pci_device_id vx855_pci_tbl[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) },
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, vx855_pci_tbl);
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static struct pci_driver vx855_pci_driver = {
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.name = "vx855",
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.id_table = vx855_pci_tbl,
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.probe = vx855_probe,
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.remove = vx855_remove,
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};
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module_pci_driver(vx855_pci_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
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MODULE_DESCRIPTION("Driver for the VIA VX855 chipset");
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