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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Dummy driver for Intel's Image Signal Processor found on Bay Trail
- * and Cherry Trail devices. The sole purpose of this driver is to allow
- * the ISP to be put in D3.
- *
- * Copyright (C) 2018 Hans de Goede <hdegoede@redhat.com>
- *
- * Based on various non upstream patches for ISP support:
- * Copyright (C) 2010-2017 Intel Corporation. All rights reserved.
- * Copyright (c) 2010 Silicon Hive www.siliconhive.com.
- */
- #include <linux/delay.h>
- #include <linux/module.h>
- #include <linux/mod_devicetable.h>
- #include <linux/pci.h>
- #include <linux/pm_runtime.h>
- #include <asm/iosf_mbi.h>
- /* PCI configuration regs */
- #define PCI_INTERRUPT_CTRL 0x9c
- #define PCI_CSI_CONTROL 0xe8
- #define PCI_CSI_CONTROL_PORTS_OFF_MASK 0x7
- /* IOSF BT_MBI_UNIT_PMC regs */
- #define ISPSSPM0 0x39
- #define ISPSSPM0_ISPSSC_OFFSET 0
- #define ISPSSPM0_ISPSSC_MASK 0x00000003
- #define ISPSSPM0_ISPSSS_OFFSET 24
- #define ISPSSPM0_ISPSSS_MASK 0x03000000
- #define ISPSSPM0_IUNIT_POWER_ON 0x0
- #define ISPSSPM0_IUNIT_POWER_OFF 0x3
- static int isp_set_power(struct pci_dev *dev, bool enable)
- {
- unsigned long timeout;
- u32 val = enable ? ISPSSPM0_IUNIT_POWER_ON : ISPSSPM0_IUNIT_POWER_OFF;
- /* Write to ISPSSPM0 bit[1:0] to power on/off the IUNIT */
- iosf_mbi_modify(BT_MBI_UNIT_PMC, MBI_REG_READ, ISPSSPM0,
- val, ISPSSPM0_ISPSSC_MASK);
- /*
- * There should be no IUNIT access while power-down is
- * in progress. HW sighting: 4567865.
- * Wait up to 50 ms for the IUNIT to shut down.
- * And we do the same for power on.
- */
- timeout = jiffies + msecs_to_jiffies(50);
- do {
- u32 tmp;
- /* Wait until ISPSSPM0 bit[25:24] shows the right value */
- iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ, ISPSSPM0, &tmp);
- tmp = (tmp & ISPSSPM0_ISPSSS_MASK) >> ISPSSPM0_ISPSSS_OFFSET;
- if (tmp == val)
- return 0;
- usleep_range(1000, 2000);
- } while (time_before(jiffies, timeout));
- dev_err(&dev->dev, "IUNIT power-%s timeout.\n", enable ? "on" : "off");
- return -EBUSY;
- }
- static int isp_probe(struct pci_dev *dev, const struct pci_device_id *id)
- {
- pm_runtime_allow(&dev->dev);
- pm_runtime_put_sync_suspend(&dev->dev);
- return 0;
- }
- static void isp_remove(struct pci_dev *dev)
- {
- pm_runtime_get_sync(&dev->dev);
- pm_runtime_forbid(&dev->dev);
- }
- static int isp_pci_suspend(struct device *dev)
- {
- struct pci_dev *pdev = to_pci_dev(dev);
- u32 val;
- pci_write_config_dword(pdev, PCI_INTERRUPT_CTRL, 0);
- /*
- * MRFLD IUNIT DPHY is located in an always-power-on island
- * MRFLD HW design need all CSI ports are disabled before
- * powering down the IUNIT.
- */
- pci_read_config_dword(pdev, PCI_CSI_CONTROL, &val);
- val |= PCI_CSI_CONTROL_PORTS_OFF_MASK;
- pci_write_config_dword(pdev, PCI_CSI_CONTROL, val);
- /*
- * We lose config space access when punit power gates
- * the ISP. Can't use pci_set_power_state() because
- * pmcsr won't actually change when we write to it.
- */
- pci_save_state(pdev);
- pdev->current_state = PCI_D3cold;
- isp_set_power(pdev, false);
- return 0;
- }
- static int isp_pci_resume(struct device *dev)
- {
- struct pci_dev *pdev = to_pci_dev(dev);
- isp_set_power(pdev, true);
- pdev->current_state = PCI_D0;
- pci_restore_state(pdev);
- return 0;
- }
- static UNIVERSAL_DEV_PM_OPS(isp_pm_ops, isp_pci_suspend,
- isp_pci_resume, NULL);
- static const struct pci_device_id isp_id_table[] = {
- { PCI_VDEVICE(INTEL, 0x0f38), },
- { PCI_VDEVICE(INTEL, 0x22b8), },
- { 0, }
- };
- MODULE_DEVICE_TABLE(pci, isp_id_table);
- static struct pci_driver isp_pci_driver = {
- .name = "intel_atomisp2_pm",
- .id_table = isp_id_table,
- .probe = isp_probe,
- .remove = isp_remove,
- .driver.pm = &isp_pm_ops,
- };
- module_pci_driver(isp_pci_driver);
- MODULE_DESCRIPTION("Intel AtomISP2 dummy / power-management drv (for suspend)");
- MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
- MODULE_LICENSE("GPL v2");
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