diff options
Diffstat (limited to 'drivers/platform/x86/intel_atomisp2_pm.c')
| -rw-r--r-- | drivers/platform/x86/intel_atomisp2_pm.c | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/drivers/platform/x86/intel_atomisp2_pm.c b/drivers/platform/x86/intel_atomisp2_pm.c deleted file mode 100644 index b0f421fea2a5..000000000000 --- a/drivers/platform/x86/intel_atomisp2_pm.c +++ /dev/null @@ -1,148 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Dummy driver for Intel's Image Signal Processor found on Bay 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); - while (1) { - 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) - break; - - if (time_after(jiffies, timeout)) { - dev_err(&dev->dev, "IUNIT power-%s timeout.\n", - enable ? "on" : "off"); - return -EBUSY; - } - usleep_range(1000, 2000); - } - - return 0; -} - -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"); |