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123 lines
3.2 KiB
123 lines
3.2 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Driver for the VIA VX855 chipset");
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