From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/power/reset/piix4-poweroff.c | 109 +++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 drivers/power/reset/piix4-poweroff.c (limited to 'drivers/power/reset/piix4-poweroff.c') diff --git a/drivers/power/reset/piix4-poweroff.c b/drivers/power/reset/piix4-poweroff.c new file mode 100644 index 000000000..7f308292d --- /dev/null +++ b/drivers/power/reset/piix4-poweroff.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2016 Imagination Technologies + * Author: Paul Burton + */ + +#include +#include +#include +#include +#include + +static struct pci_dev *pm_dev; +static resource_size_t io_offset; + +enum piix4_pm_io_reg { + PIIX4_FUNC3IO_PMSTS = 0x00, +#define PIIX4_FUNC3IO_PMSTS_PWRBTN_STS BIT(8) + PIIX4_FUNC3IO_PMCNTRL = 0x04, +#define PIIX4_FUNC3IO_PMCNTRL_SUS_EN BIT(13) +#define PIIX4_FUNC3IO_PMCNTRL_SUS_TYP_SOFF (0x0 << 10) +}; + +#define PIIX4_SUSPEND_MAGIC 0x00120002 + +static const int piix4_pm_io_region = PCI_BRIDGE_RESOURCES; + +static void piix4_poweroff(void) +{ + int spec_devid; + u16 sts; + + /* Ensure the power button status is clear */ + while (1) { + sts = inw(io_offset + PIIX4_FUNC3IO_PMSTS); + if (!(sts & PIIX4_FUNC3IO_PMSTS_PWRBTN_STS)) + break; + outw(sts, io_offset + PIIX4_FUNC3IO_PMSTS); + } + + /* Enable entry to suspend */ + outw(PIIX4_FUNC3IO_PMCNTRL_SUS_TYP_SOFF | PIIX4_FUNC3IO_PMCNTRL_SUS_EN, + io_offset + PIIX4_FUNC3IO_PMCNTRL); + + /* If the special cycle occurs too soon this doesn't work... */ + mdelay(10); + + /* + * The PIIX4 will enter the suspend state only after seeing a special + * cycle with the correct magic data on the PCI bus. Generate that + * cycle now. + */ + spec_devid = PCI_DEVID(0, PCI_DEVFN(0x1f, 0x7)); + pci_bus_write_config_dword(pm_dev->bus, spec_devid, 0, + PIIX4_SUSPEND_MAGIC); + + /* Give the system some time to power down, then error */ + mdelay(1000); + pr_emerg("Unable to poweroff system\n"); +} + +static int piix4_poweroff_probe(struct pci_dev *dev, + const struct pci_device_id *id) +{ + int res; + + if (pm_dev) + return -EINVAL; + + /* Request access to the PIIX4 PM IO registers */ + res = pci_request_region(dev, piix4_pm_io_region, + "PIIX4 PM IO registers"); + if (res) { + dev_err(&dev->dev, "failed to request PM IO registers: %d\n", + res); + return res; + } + + pm_dev = dev; + io_offset = pci_resource_start(dev, piix4_pm_io_region); + pm_power_off = piix4_poweroff; + + return 0; +} + +static void piix4_poweroff_remove(struct pci_dev *dev) +{ + if (pm_power_off == piix4_poweroff) + pm_power_off = NULL; + + pci_release_region(dev, piix4_pm_io_region); + pm_dev = NULL; +} + +static const struct pci_device_id piix4_poweroff_ids[] = { + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) }, + { 0 }, +}; + +static struct pci_driver piix4_poweroff_driver = { + .name = "piix4-poweroff", + .id_table = piix4_poweroff_ids, + .probe = piix4_poweroff_probe, + .remove = piix4_poweroff_remove, +}; + +module_pci_driver(piix4_poweroff_driver); +MODULE_AUTHOR("Paul Burton "); +MODULE_LICENSE("GPL"); -- cgit v1.2.3