include/linux/intel_vsec.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _INTEL_VSEC_H
#define _INTEL_VSEC_H

#include <linux/auxiliary_bus.h>
#include <linux/bits.h>

#define VSEC_CAP_TELEMETRY	BIT(0)
#define VSEC_CAP_WATCHER	BIT(1)
#define VSEC_CAP_CRASHLOG	BIT(2)
#define VSEC_CAP_SDSI		BIT(3)
#define VSEC_CAP_TPMI		BIT(4)

/* Intel DVSEC offsets */
#define INTEL_DVSEC_ENTRIES		0xA
#define INTEL_DVSEC_SIZE		0xB
#define INTEL_DVSEC_TABLE		0xC
#define INTEL_DVSEC_TABLE_BAR(x)	((x) & GENMASK(2, 0))
#define INTEL_DVSEC_TABLE_OFFSET(x)	((x) & GENMASK(31, 3))
#define TABLE_OFFSET_SHIFT		3

struct pci_dev;
struct resource;

enum intel_vsec_id {
	VSEC_ID_TELEMETRY	= 2,
	VSEC_ID_WATCHER		= 3,
	VSEC_ID_CRASHLOG	= 4,
	VSEC_ID_SDSI		= 65,
	VSEC_ID_TPMI		= 66,
};

/**
 * struct intel_vsec_header - Common fields of Intel VSEC and DVSEC registers.
 * @rev:         Revision ID of the VSEC/DVSEC register space
 * @length:      Length of the VSEC/DVSEC register space
 * @id:          ID of the feature
 * @num_entries: Number of instances of the feature
 * @entry_size:  Size of the discovery table for each feature
 * @tbir:        BAR containing the discovery tables
 * @offset:      BAR offset of start of the first discovery table
 */
struct intel_vsec_header {
	u8	rev;
	u16	length;
	u16	id;
	u8	num_entries;
	u8	entry_size;
	u8	tbir;
	u32	offset;
};

enum intel_vsec_quirks {
	/* Watcher feature not supported */
	VSEC_QUIRK_NO_WATCHER	= BIT(0),

	/* Crashlog feature not supported */
	VSEC_QUIRK_NO_CRASHLOG	= BIT(1),

	/* Use shift instead of mask to read discovery table offset */
	VSEC_QUIRK_TABLE_SHIFT	= BIT(2),

	/* DVSEC not present (provided in driver data) */
	VSEC_QUIRK_NO_DVSEC	= BIT(3),

	/* Platforms requiring quirk in the auxiliary driver */
	VSEC_QUIRK_EARLY_HW     = BIT(4),
};

/**
 * struct pmt_callbacks - Callback infrastructure for PMT devices
 * ->read_telem() when specified, called by client driver to access PMT data (instead
 * of direct copy).
 * @pdev:  PCI device reference for the callback's use
 * @guid:  ID of data to acccss
 * @data:  buffer for the data to be copied
 * @off:   offset into the requested buffer
 * @count: size of buffer
 */
struct pmt_callbacks {
	int (*read_telem)(struct pci_dev *pdev, u32 guid, u64 *data, loff_t off, u32 count);
};

/**
 * struct intel_vsec_platform_info - Platform specific data
 * @parent:    parent device in the auxbus chain
 * @headers:   list of headers to define the PMT client devices to create
 * @priv_data: private data, usable by parent devices, currently a callback
 * @caps:      bitmask of PMT capabilities for the given headers
 * @quirks:    bitmask of VSEC device quirks
 * @base_addr: allow a base address to be specified (rather than derived)
 */
struct intel_vsec_platform_info {
	struct device *parent;
	struct intel_vsec_header **headers;
	void *priv_data;
	unsigned long caps;
	unsigned long quirks;
	u64 base_addr;
};

/**
 * struct intel_sec_device - Auxbus specific device information
 * @auxdev:        auxbus device struct for auxbus access
 * @pcidev:        pci device associated with the device
 * @resource:      any resources shared by the parent
 * @ida:           id reference
 * @num_resources: number of resources
 * @id:            xarray id
 * @priv_data:     any private data needed
 * @quirks:        specified quirks
 * @base_addr:     base address of entries (if specified)
 */
struct intel_vsec_device {
	struct auxiliary_device auxdev;
	struct pci_dev *pcidev;
	struct resource *resource;
	struct ida *ida;
	int num_resources;
	int id; /* xa */
	void *priv_data;
	size_t priv_data_size;
	unsigned long quirks;
	u64 base_addr;
};

int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
		       struct intel_vsec_device *intel_vsec_dev,
		       const char *name);

static inline struct intel_vsec_device *dev_to_ivdev(struct device *dev)
{
	return container_of(dev, struct intel_vsec_device, auxdev.dev);
}

static inline struct intel_vsec_device *auxdev_to_ivdev(struct auxiliary_device *auxdev)
{
	return container_of(auxdev, struct intel_vsec_device, auxdev);
}

#if IS_ENABLED(CONFIG_INTEL_VSEC)
void intel_vsec_register(struct pci_dev *pdev,
			 struct intel_vsec_platform_info *info);
#else
static inline void intel_vsec_register(struct pci_dev *pdev,
				       struct intel_vsec_platform_info *info)
{
}
#endif
#endif