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Subject[PATCH 2/5] mei: add gsc driver
Date
From: Tomas Winkler <tomas.winkler@intel.com>

GSC is a graphics system controller, based on CSE, it provides
a chassis controller for graphics discrete cards, as well as it
supports media protection (HDCP 2.2) on selected devices.

mei_gsc binds to a platform devices exposed by Intel discrete
driver i915 via MFD framework.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/Kconfig | 12 +++
drivers/misc/mei/Makefile | 3 +
drivers/misc/mei/gsc-me.c | 214 ++++++++++++++++++++++++++++++++++++++
drivers/misc/mei/hw-me.c | 27 ++++-
drivers/misc/mei/hw-me.h | 2 +
5 files changed, 256 insertions(+), 2 deletions(-)
create mode 100644 drivers/misc/mei/gsc-me.c

diff --git a/drivers/misc/mei/Kconfig b/drivers/misc/mei/Kconfig
index 0e0bcd0da852..712d72e25138 100644
--- a/drivers/misc/mei/Kconfig
+++ b/drivers/misc/mei/Kconfig
@@ -49,3 +49,15 @@ config INTEL_MEI_TXE
source "drivers/misc/mei/hdcp/Kconfig"
source "drivers/misc/mei/pxp/Kconfig"

+config INTEL_MEI_GSC
+ tristate "Intel MEI GSC embedded device"
+ select INTEL_MEI
+ select INTEL_MEI_ME
+ depends on X86 && PCI
+ depends on DRM_I915
+ help
+ Intel platform driver for MEI devices embedded in a graphics device.
+
+ MEI device can be embedded in a standalone Intel graphics devices,
+ to support range of security tasks.
+ Currently supported device is DG1.
diff --git a/drivers/misc/mei/Makefile b/drivers/misc/mei/Makefile
index d8e5165917f2..fb740d754900 100644
--- a/drivers/misc/mei/Makefile
+++ b/drivers/misc/mei/Makefile
@@ -18,6 +18,9 @@ obj-$(CONFIG_INTEL_MEI_ME) += mei-me.o
mei-me-objs := pci-me.o
mei-me-objs += hw-me.o

+obj-$(CONFIG_INTEL_MEI_GSC) += mei-gsc.o
+mei-gsc-objs := gsc-me.o
+
obj-$(CONFIG_INTEL_MEI_TXE) += mei-txe.o
mei-txe-objs := pci-txe.o
mei-txe-objs += hw-txe.o
diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c
new file mode 100644
index 000000000000..901d6e0ce6cd
--- /dev/null
+++ b/drivers/misc/mei/gsc-me.c
@@ -0,0 +1,214 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright(c) 2019-2020, Intel Corporation. All rights reserved.
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/irqreturn.h>
+#include <linux/jiffies.h>
+#include <linux/ktime.h>
+#include <linux/delay.h>
+#include <linux/pm_runtime.h>
+
+#include "mei_dev.h"
+#include "hw-me.h"
+#include "hw-me-regs.h"
+
+#include "mei-trace.h"
+
+#define MEI_GSC_RPM_TIMEOUT 500
+
+static int mei_gsc_read_hfs(const struct mei_device *dev, int where, u32 *val)
+{
+ struct mei_me_hw *hw = to_me_hw(dev);
+
+ *val = ioread32(hw->mem_addr + where + 0xC00);
+
+ return 0;
+}
+
+static int mei_gsc_probe(struct platform_device *platdev)
+{
+ struct mei_device *dev;
+ struct mei_me_hw *hw;
+ struct resource *bar;
+ struct device *device;
+ const struct platform_device_id *ent;
+ const struct mei_cfg *cfg;
+ int ret;
+
+ ent = platform_get_device_id(platdev);
+ cfg = mei_me_get_cfg(ent->driver_data);
+ if (!cfg)
+ return -ENODEV;
+
+ device = &platdev->dev;
+
+ dev = mei_me_dev_init(device, cfg);
+ if (IS_ERR(dev)) {
+ ret = PTR_ERR(dev);
+ goto err;
+ }
+
+ bar = platform_get_resource(platdev, IORESOURCE_MEM, 0);
+
+ hw = to_me_hw(dev);
+ hw->mem_addr = devm_ioremap_resource(device, bar);
+ if (IS_ERR(hw->mem_addr)) {
+ dev_err(device, "mmio not mapped\n");
+ ret = PTR_ERR(hw->mem_addr);
+ goto err;
+ }
+
+ hw->irq = platform_get_irq(platdev, 0);
+ if (hw->irq < 0) {
+ ret = hw->irq;
+ goto err;
+ }
+ hw->read_fws = mei_gsc_read_hfs;
+
+ platform_set_drvdata(platdev, dev);
+
+ ret = devm_request_threaded_irq(device, hw->irq,
+ mei_me_irq_quick_handler,
+ mei_me_irq_thread_handler,
+ IRQF_ONESHOT, KBUILD_MODNAME, dev);
+ if (ret) {
+ dev_err(device, "irq register failed %d\n", ret);
+ goto err;
+ }
+
+ pm_runtime_get_noresume(device);
+ pm_runtime_set_active(device);
+ pm_runtime_enable(device);
+
+ if (mei_start(dev)) {
+ dev_err(device, "init hw failure.\n");
+ ret = -ENODEV;
+ goto err;
+ }
+
+ pm_runtime_set_autosuspend_delay(device, MEI_GSC_RPM_TIMEOUT);
+ pm_runtime_use_autosuspend(device);
+
+ ret = mei_register(dev, device);
+ if (ret)
+ goto register_err;
+
+ pm_runtime_put_noidle(device);
+ return 0;
+
+register_err:
+ mei_stop(dev);
+
+err:
+ dev_err(device, "probe failed: %d\n", ret);
+ platform_set_drvdata(platdev, NULL);
+ return ret;
+}
+
+static int mei_gsc_remove(struct platform_device *platdev)
+{
+ struct mei_device *dev;
+
+ dev = platform_get_drvdata(platdev);
+ if (!dev)
+ return -ENODEV;
+
+ mei_stop(dev);
+
+ mei_deregister(dev);
+
+ pm_runtime_disable(&platdev->dev);
+
+ return 0;
+}
+
+static int __maybe_unused mei_gsc_pm_suspend(struct device *device)
+{
+ struct mei_device *dev;
+
+ dev_dbg(device, "suspend\n");
+
+ dev = dev_get_drvdata(device);
+ if (!dev)
+ return -ENODEV;
+
+ mei_stop(dev);
+
+ mei_disable_interrupts(dev);
+
+ return 0;
+}
+
+static int __maybe_unused mei_gsc_pm_resume(struct device *device)
+{
+ struct mei_device *dev;
+ int err;
+
+ dev_dbg(device, "resume\n");
+
+ dev = dev_get_drvdata(device);
+ if (!dev)
+ return -ENODEV;
+
+ err = mei_restart(dev);
+ if (err)
+ return err;
+
+ /* Start timer if stopped in suspend */
+ schedule_delayed_work(&dev->timer_work, HZ);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(mei_gsc_pm_ops, mei_gsc_pm_suspend, mei_gsc_pm_resume);
+
+static const struct platform_device_id gsc_devtypes[] = {
+ {
+ .name = "mei-gsc",
+ .driver_data = MEI_ME_GSC_CFG,
+ },
+ {
+ .name = "mei-gscfi",
+ .driver_data = MEI_ME_GSCFI_CFG,
+ },
+ {
+ /* sentinel */
+ }
+};
+
+static struct platform_driver mei_gsc_driver = {
+ .probe = mei_gsc_probe,
+ .remove = mei_gsc_remove,
+ .driver = {
+ .name = "mei-gsc",
+ .pm = &mei_gsc_pm_ops,
+ },
+ .id_table = gsc_devtypes,
+};
+
+static int __init mei_gsc_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&mei_gsc_driver);
+
+ return ret;
+}
+module_init(mei_gsc_init);
+
+static void __exit mei_gsc_exit(void)
+{
+ platform_driver_unregister(&mei_gsc_driver);
+}
+module_exit(mei_gsc_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_ALIAS("platform:mei-gsc");
+MODULE_ALIAS("platform:mei-gscfi");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index d3a6c0728645..9748d14849a1 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -1226,6 +1226,7 @@ irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id)
me_intr_disable(dev, hcsr);
return IRQ_WAKE_THREAD;
}
+EXPORT_SYMBOL_GPL(mei_me_irq_quick_handler);

/**
* mei_me_irq_thread_handler - function called after ISR to handle the interrupt
@@ -1320,6 +1321,7 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
mutex_unlock(&dev->device_lock);
return IRQ_HANDLED;
}
+EXPORT_SYMBOL_GPL(mei_me_irq_thread_handler);

static const struct mei_hw_ops mei_me_hw_ops = {

@@ -1433,6 +1435,12 @@ static bool mei_me_fw_type_sps(const struct pci_dev *pdev)
#define MEI_CFG_KIND_ITOUCH \
.kind = "itouch"

+#define MEI_CFG_TYPE_GSC \
+ .kind = "gsc"
+
+#define MEI_CFG_TYPE_GSCFI \
+ .kind = "gscfi"
+
#define MEI_CFG_FW_SPS \
.quirk_probe = mei_me_fw_type_sps

@@ -1565,6 +1573,18 @@ static const struct mei_cfg mei_me_pch15_sps_cfg = {
MEI_CFG_FW_SPS,
};

+/* Graphics System Controller */
+static const struct mei_cfg mei_me_gsc_cfg = {
+ MEI_CFG_TYPE_GSC,
+ MEI_CFG_PCH8_HFS,
+};
+
+/* Graphics System Controller Firmware Interface */
+static const struct mei_cfg mei_me_gscfi_cfg = {
+ MEI_CFG_TYPE_GSCFI,
+ MEI_CFG_PCH8_HFS,
+};
+
/*
* mei_cfg_list - A list of platform platform specific configurations.
* Note: has to be synchronized with enum mei_cfg_idx.
@@ -1585,6 +1605,8 @@ static const struct mei_cfg *const mei_cfg_list[] = {
[MEI_ME_PCH12_SPS_ITOUCH_CFG] = &mei_me_pch12_itouch_sps_cfg,
[MEI_ME_PCH15_CFG] = &mei_me_pch15_cfg,
[MEI_ME_PCH15_SPS_CFG] = &mei_me_pch15_sps_cfg,
+ [MEI_ME_GSC_CFG] = &mei_me_gsc_cfg,
+ [MEI_ME_GSCFI_CFG] = &mei_me_gscfi_cfg,
};

const struct mei_cfg *mei_me_get_cfg(kernel_ulong_t idx)
@@ -1595,7 +1617,8 @@ const struct mei_cfg *mei_me_get_cfg(kernel_ulong_t idx)
return NULL;

return mei_cfg_list[idx];
-};
+}
+EXPORT_SYMBOL_GPL(mei_me_get_cfg);

/**
* mei_me_dev_init - allocates and initializes the mei device structure
@@ -1630,4 +1653,4 @@ struct mei_device *mei_me_dev_init(struct device *parent,

return dev;
}
-
+EXPORT_SYMBOL_GPL(mei_me_dev_init);
diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h
index 00a7132ac7a2..a071c645e905 100644
--- a/drivers/misc/mei/hw-me.h
+++ b/drivers/misc/mei/hw-me.h
@@ -112,6 +112,8 @@ enum mei_cfg_idx {
MEI_ME_PCH12_SPS_ITOUCH_CFG,
MEI_ME_PCH15_CFG,
MEI_ME_PCH15_SPS_CFG,
+ MEI_ME_GSC_CFG,
+ MEI_ME_GSCFI_CFG,
MEI_ME_NUM_CFG,
};

--
2.32.0
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