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-rw-r--r--MAINTAINERS6
-rw-r--r--drivers/platform/x86/Kconfig12
-rw-r--r--drivers/platform/x86/Makefile1
-rw-r--r--drivers/platform/x86/intel_atomisp2_pm.c119
4 files changed, 138 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index 0112e977eec0..08bddcf43314 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7296,6 +7296,12 @@ L: alsa-devel@alsa-project.org (moderated for non-subscribers)
S: Supported
F: sound/soc/intel/
+INTEL ATOMISP2 DUMMY / POWER-MANAGEMENT DRIVER
+M: Hans de Goede <hdegoede@redhat.com>
+L: platform-driver-x86@vger.kernel.org
+S: Maintained
+F: drivers/platform/x86/intel_atomisp2_pm.c
+
INTEL C600 SERIES SAS CONTROLLER DRIVER
M: Intel SCU Linux support <intel-linux-scu@intel.com>
M: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 1991608549d5..27a27fca3be1 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1274,6 +1274,18 @@ config I2C_MULTI_INSTANTIATE
To compile this driver as a module, choose M here: the module
will be called i2c-multi-instantiate.
+config INTEL_ATOMISP2_PM
+ tristate "Intel AtomISP2 dummy / power-management driver"
+ depends on PCI && IOSF_MBI && PM
+ help
+ Power-management driver for Intel's Image Signal Processor found on
+ Bay and Cherry Trail devices. This dummy driver's sole purpose is to
+ turn the ISP off (put it in D3) to save power and to allow entering
+ of S0ix modes.
+
+ To compile this driver as a module, choose M here: the module
+ will be called intel_atomisp2_pm.
+
endif # X86_PLATFORM_DEVICES
config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 395c8ff12bd1..39ae94135406 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -95,3 +95,4 @@ obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o
obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
obj-$(CONFIG_INTEL_CHTDC_TI_PWRBTN) += intel_chtdc_ti_pwrbtn.o
obj-$(CONFIG_I2C_MULTI_INSTANTIATE) += i2c-multi-instantiate.o
+obj-$(CONFIG_INTEL_ATOMISP2_PM) += intel_atomisp2_pm.o
diff --git a/drivers/platform/x86/intel_atomisp2_pm.c b/drivers/platform/x86/intel_atomisp2_pm.c
new file mode 100644
index 000000000000..9371603a0ac9
--- /dev/null
+++ b/drivers/platform/x86/intel_atomisp2_pm.c
@@ -0,0 +1,119 @@
+// 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_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ unsigned long timeout;
+ u32 val;
+
+ pci_write_config_dword(dev, 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(dev, PCI_CSI_CONTROL, &val);
+ val |= PCI_CSI_CONTROL_PORTS_OFF_MASK;
+ pci_write_config_dword(dev, PCI_CSI_CONTROL, val);
+
+ /* Write 0x3 to ISPSSPM0 bit[1:0] to power off the IUNIT */
+ iosf_mbi_modify(BT_MBI_UNIT_PMC, MBI_REG_READ, ISPSSPM0,
+ ISPSSPM0_IUNIT_POWER_OFF, 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.
+ */
+ timeout = jiffies + msecs_to_jiffies(50);
+ while (1) {
+ /* Wait until ISPSSPM0 bit[25:24] shows 0x3 */
+ iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ, ISPSSPM0, &val);
+ val = (val & ISPSSPM0_ISPSSS_MASK) >> ISPSSPM0_ISPSSS_OFFSET;
+ if (val == ISPSSPM0_IUNIT_POWER_OFF)
+ break;
+
+ if (time_after(jiffies, timeout)) {
+ dev_err(&dev->dev, "IUNIT power-off timeout.\n");
+ return -EBUSY;
+ }
+ usleep_range(1000, 2000);
+ }
+
+ 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)
+{
+ return 0;
+}
+
+static int isp_pci_resume(struct device *dev)
+{
+ 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, 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");