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0848c94fb4
Currently the MFD core supports remapping MFD cell interrupts using an irqdomain but only if the MFD is being instantiated using device tree and only if the device tree bindings use the pattern of registering IPs in the device tree with compatible properties. This will be actively harmful for drivers which support non-DT platforms and use this pattern for their DT bindings as it will mean that the core will silently change remapping behaviour and it is also limiting for drivers which don't do DT with this particular pattern. There is also a potential fragility if there are interrupts not associated with MFD cells and all the cells are omitted from the device tree for some reason. Instead change the code to take an IRQ domain as an optional argument, allowing drivers to take the decision about the parent domain for their interrupts. The one current user of this feature is ab8500-core, it has the domain lookup pushed out into the driver. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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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 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 __devinit 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 __devexit 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 DEFINE_PCI_DEVICE_TABLE(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 = __devexit_p(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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