/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 *
 * (C) COPYRIGHT 2010-2017, 2019-2022 ARM Limited. All rights reserved.
 *
 * This program is free software and is provided to you under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation, and any use by you of this program is subject to the terms
 * of such GNU license.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you can access it online at
 * http://www.gnu.org/licenses/gpl-2.0.html.
 *
 */

/**
 * DOC: Configuration API and Attributes for KBase
 */

#ifndef _KBASE_CONFIG_H_
#define _KBASE_CONFIG_H_

#include <linux/mm.h>
#include <mali_malisw.h>
#include <backend/gpu/mali_kbase_backend_config.h>
#include <linux/rbtree.h>

/* Forward declaration of struct kbase_device */
struct kbase_device;

#if !MALI_USE_CSF
/* Forward declaration of struct kbase_context */
struct kbase_context;

/* Forward declaration of struct kbase_atom */
struct kbase_jd_atom;
#endif

/**
 * struct kbase_platform_funcs_conf - Specifies platform integration function
 * pointers for DDK events such as device init and term.
 *
 * Specifies the functions pointers for platform specific initialization and
 * termination as well as other events. By default no functions are required.
 * No additional platform specific control is necessary.
 */
struct kbase_platform_funcs_conf {
	/**
	 * @platform_init_func: platform specific init function pointer
	 * @kbdev - kbase_device pointer
	 *
	 * Returns 0 on success, negative error code otherwise.
	 *
	 * Function pointer for platform specific initialization or NULL if no
	 * initialization function is required. At the point this the GPU is
	 * not active and its power and clocks are in unknown (platform specific
	 * state) as kbase doesn't yet have control of power and clocks.
	 *
	 * The platform specific private pointer kbase_device::platform_context
	 * can be accessed (and possibly initialized) in here.
	 */
	int (*platform_init_func)(struct kbase_device *kbdev);
	/**
	 * @platform_term_func: platform specific termination function pointer
	 * @kbdev - kbase_device pointer
	 *
	 * Function pointer for platform specific termination or NULL if no
	 * termination function is required. At the point this the GPU will be
	 * idle but still powered and clocked.
	 *
	 * The platform specific private pointer kbase_device::platform_context
	 * can be accessed (and possibly terminated) in here.
	 */
	void (*platform_term_func)(struct kbase_device *kbdev);

	/**
	 * @platform_late_init_func: platform specific late init function pointer
	 * @kbdev - kbase_device pointer
	 *
	 * Function pointer to inform that the kbase driver initialization completed
	 * or NULL if no such function is required. At this point the GPU driver will be
	 * fully initialized.
	 *
	 * The platform specific private pointer kbase_device::platform_context
	 * can be accessed (and possibly terminated) in here.
	 */
	int (*platform_late_init_func)(struct kbase_device *kbdev);

	/**
	 * @platform_late_term_func: platform specific late termination function pointer
	 * @kbdev - kbase_device pointer
	 *
	 * Function pointer for platform specific termination or NULL if no
	 * termination function is required. At this point the GPU driver will complete
	 * termination process
	 *
	 * The platform specific private pointer kbase_device::platform_context
	 * can be accessed (and possibly terminated) in here.
	 */
	void (*platform_late_term_func)(struct kbase_device *kbdev);

#if !MALI_USE_CSF
	/**
	 * @platform_handler_context_init_func: platform specific handler for
	 * when a new kbase_context is created.
	 * @kctx - kbase_context pointer
	 *
	 * Returns 0 on success, negative error code otherwise.
	 *
	 * Function pointer for platform specific initialization of a kernel
	 * context or NULL if not required. Called at the last stage of kernel
	 * context initialization.
	 */
	int (*platform_handler_context_init_func)(struct kbase_context *kctx);
	/**
	 * @platform_handler_context_term_func: platform specific handler for
	 * when a kbase_context is terminated.
	 * @kctx - kbase_context pointer
	 *
	 * Function pointer for platform specific termination of a kernel
	 * context or NULL if not required. Called at the first stage of kernel
	 * context termination.
	 */
	void (*platform_handler_context_term_func)(struct kbase_context *kctx);
	/**
	 * @platform_handler_atom_submit_func: platform specific handler for
	 * when a kbase_jd_atom is submitted.
	 * @katom - kbase_jd_atom pointer
	 *
	 * Function pointer for platform specific handling at the point when an
	 * atom is submitted to the GPU or set to NULL if not required. The
	 * function cannot assume that it is running in a process context.
	 *
	 * Context: The caller must hold the hwaccess_lock. Function must be
	 *          runnable in an interrupt context.
	 */
	void (*platform_handler_atom_submit_func)(struct kbase_jd_atom *katom);
	/**
	 * @platform_handler_atom_complete_func: platform specific handler for
	 * when a kbase_jd_atom completes.
	 * @katom - kbase_jd_atom pointer
	 *
	 * Function pointer for platform specific handling at the point when an
	 * atom stops running on the GPU or set to NULL if not required. The
	 * function cannot assume that it is running in a process context.
	 *
	 * Context: The caller must hold the hwaccess_lock. Function must be
	 *          runnable in an interrupt context.
	 */
	void (*platform_handler_atom_complete_func)(
		struct kbase_jd_atom *katom);
#endif
};

/*
 * @brief Specifies the callbacks for power management
 *
 * By default no callbacks will be made and the GPU must not be powered off.
 */
struct kbase_pm_callback_conf {
	/** Callback for when the GPU is idle and the power to it can be switched off.
	 *
	 * The system integrator can decide whether to either do nothing, just switch off
	 * the clocks to the GPU, or to completely power down the GPU.
	 * The platform specific private pointer kbase_device::platform_context can be accessed and modified in here. It is the
	 * platform \em callbacks responsibility to initialize and terminate this pointer if used (see @ref kbase_platform_funcs_conf).
	 *
	 * If runtime PM is enabled and @power_runtime_gpu_idle_callback is used
	 * then this callback should power off the GPU (or switch off the clocks
	 * to GPU) immediately. If @power_runtime_gpu_idle_callback is not used,
	 * then this callback can set the autosuspend timeout (if desired) and
	 * let the GPU be powered down later.
	 */
	void (*power_off_callback)(struct kbase_device *kbdev);

	/** Callback for when the GPU is about to become active and power must be supplied.
	 *
	 * This function must not return until the GPU is powered and clocked sufficiently for register access to
	 * succeed.  The return value specifies whether the GPU was powered down since the call to power_off_callback.
	 * If the GPU state has been lost then this function must return 1, otherwise it should return 0.
	 * The platform specific private pointer kbase_device::platform_context can be accessed and modified in here. It is the
	 * platform \em callbacks responsibility to initialize and terminate this pointer if used (see @ref kbase_platform_funcs_conf).
	 *
	 * The return value of the first call to this function is ignored.
	 *
	 * @return 1 if the GPU state may have been lost, 0 otherwise.
	 */
	int (*power_on_callback)(struct kbase_device *kbdev);

	/** Callback for when the system is requesting a suspend and GPU power
	 * must be switched off.
	 *
	 * Note that if this callback is present, then this may be called
	 * without a preceding call to power_off_callback. Therefore this
	 * callback must be able to take any action that might otherwise happen
	 * in power_off_callback.
	 *
	 * The platform specific private pointer kbase_device::platform_context
	 * can be accessed and modified in here. It is the platform \em
	 * callbacks responsibility to initialize and terminate this pointer if
	 * used (see @ref kbase_platform_funcs_conf).
	 */
	void (*power_suspend_callback)(struct kbase_device *kbdev);

	/** Callback for when the system is resuming from a suspend and GPU
	 * power must be switched on.
	 *
	 * Note that if this callback is present, then this may be called
	 * without a following call to power_on_callback. Therefore this
	 * callback must be able to take any action that might otherwise happen
	 * in power_on_callback.
	 *
	 * The platform specific private pointer kbase_device::platform_context
	 * can be accessed and modified in here. It is the platform \em
	 * callbacks responsibility to initialize and terminate this pointer if
	 * used (see @ref kbase_platform_funcs_conf).
	 */
	void (*power_resume_callback)(struct kbase_device *kbdev);

	/** Callback for handling runtime power management initialization.
	 *
	 * The runtime power management callbacks @ref power_runtime_off_callback and @ref power_runtime_on_callback
	 * will become active from calls made to the OS from within this function.
	 * The runtime calls can be triggered by calls from @ref power_off_callback and @ref power_on_callback.
	 * Note: for linux the kernel must have CONFIG_PM_RUNTIME enabled to use this feature.
	 *
	 * @return 0 on success, else int error code.
	 */
	 int (*power_runtime_init_callback)(struct kbase_device *kbdev);

	/** Callback for handling runtime power management termination.
	 *
	 * The runtime power management callbacks @ref power_runtime_off_callback and @ref power_runtime_on_callback
	 * should no longer be called by the OS on completion of this function.
	 * Note: for linux the kernel must have CONFIG_PM_RUNTIME enabled to use this feature.
	 */
	void (*power_runtime_term_callback)(struct kbase_device *kbdev);

	/** Callback for runtime power-off power management callback
	 *
	 * For linux this callback will be called by the kernel runtime_suspend callback.
	 * Note: for linux the kernel must have CONFIG_PM_RUNTIME enabled to use this feature.
	 */
	void (*power_runtime_off_callback)(struct kbase_device *kbdev);

	/** Callback for runtime power-on power management callback
	 *
	 * For linux this callback will be called by the kernel runtime_resume callback.
	 * Note: for linux the kernel must have CONFIG_PM_RUNTIME enabled to use this feature.
	 *
	 * @return 0 on success, else OS error code.
	 */
	int (*power_runtime_on_callback)(struct kbase_device *kbdev);

	/*
	 * Optional callback for checking if GPU can be suspended when idle
	 *
	 * This callback will be called by the runtime power management core
	 * when the reference count goes to 0 to provide notification that the
	 * GPU now seems idle.
	 *
	 * If this callback finds that the GPU can't be powered off, or handles
	 * suspend by powering off directly or queueing up a power off, a
	 * non-zero value must be returned to prevent the runtime PM core from
	 * also triggering a suspend.
	 *
	 * Returning 0 will cause the runtime PM core to conduct a regular
	 * autosuspend.
	 *
	 * This callback is optional and if not provided regular autosuspend
	 * will be triggered.
	 *
	 * Note: The Linux kernel must have CONFIG_PM_RUNTIME enabled to use
	 * this feature.
	 *
	 * Return 0 if GPU can be suspended, positive value if it can not be
	 * suspeneded by runtime PM, else OS error code
	 */
	int (*power_runtime_idle_callback)(struct kbase_device *kbdev);

	/*
	 * Optional callback for software reset
	 *
	 * This callback will be called by the power management core to trigger
	 * a GPU soft reset.
	 *
	 * Return 0 if the soft reset was successful and the RESET_COMPLETED
	 * interrupt will be raised, or a positive value if the interrupt won't
	 * be raised. On error, return the corresponding OS error code.
	 */
	int (*soft_reset_callback)(struct kbase_device *kbdev);

	/*
	 * Optional callback invoked after GPU becomes idle, not supported on
	 * JM GPUs.
	 *
	 * This callback will be invoked by the Kbase when GPU becomes idle.
	 * For JM GPUs or when runtime PM is disabled, Kbase will not invoke
	 * this callback and @power_off_callback will be invoked directly.
	 *
	 * This callback is supposed to decrement the runtime PM core reference
	 * count to zero and trigger the auto-suspend timer, which implies that
	 * @power_off_callback shouldn't initiate the runtime suspend.
	 *
	 * GPU registers still remain accessible until @power_off_callback gets
	 * invoked later on the expiry of auto-suspend timer.
	 *
	 * Note: The Linux kernel must have CONFIG_PM_RUNTIME enabled to use
	 * this feature.
	 */
	void (*power_runtime_gpu_idle_callback)(struct kbase_device *kbdev);

	/*
	 * Optional callback invoked to change the runtime PM core state to
	 * active.
	 *
	 * This callback will be invoked by Kbase when GPU needs to be
	 * reactivated, but only if @power_runtime_gpu_idle_callback was invoked
	 * previously. So both @power_runtime_gpu_idle_callback and this
	 * callback needs to be implemented at the same time.
	 *
	 * Kbase will invoke @power_on_callback first before invoking this
	 * callback if the GPU was powered down previously, otherwise directly.
	 *
	 * This callback is supposed to increment the runtime PM core reference
	 * count to 1, which implies that @power_on_callback shouldn't initiate
	 * the runtime resume. The runtime resume may not happen synchronously
	 * to avoid a potential deadlock due to the runtime suspend happening
	 * simultaneously from some other thread.
	 *
	 * Note: The Linux kernel must have CONFIG_PM_RUNTIME enabled to use
	 * this feature.
	 */
	void (*power_runtime_gpu_active_callback)(struct kbase_device *kbdev);
};

/* struct kbase_gpu_clk_notifier_data - Data for clock rate change notifier.
 *
 * Pointer to this structure is supposed to be passed to the gpu clock rate
 * change notifier function. This structure is deliberately aligned with the
 * common clock framework notification structure 'struct clk_notifier_data'
 * and such alignment should be maintained.
 *
 * @gpu_clk_handle: Handle of the GPU clock for which notifier was registered.
 * @old_rate:       Previous rate of this GPU clock in Hz.
 * @new_rate:       New rate of this GPU clock in Hz.
 */
struct kbase_gpu_clk_notifier_data {
	void *gpu_clk_handle;
	unsigned long old_rate;
	unsigned long new_rate;
};

/**
 * struct kbase_clk_rate_trace_op_conf - Specifies GPU clock rate trace
 * operations.
 *
 * Specifies the functions pointers for platform specific GPU clock rate trace
 * operations. By default no functions are required.
 */
struct kbase_clk_rate_trace_op_conf {
	/**
	 * @enumerate_gpu_clk: Enumerate a GPU clock on the given index
	 * @kbdev - kbase_device pointer
	 * @index - GPU clock index
	 *
	 * Returns a handle unique to the given GPU clock, or NULL if the clock
	 * array has been exhausted at the given index value.
	 *
	 * Kbase will use this function pointer to enumerate the existence of a
	 * GPU clock on the given index.
	 */
	void *(*enumerate_gpu_clk)(struct kbase_device *kbdev,
		unsigned int index);

	/**
	 * @get_gpu_clk_rate: Get the current rate for an enumerated clock.
	 * @kbdev          - kbase_device pointer
	 * @gpu_clk_handle - Handle unique to the enumerated GPU clock
	 *
	 * Returns current rate of the GPU clock in unit of Hz.
	 */
	unsigned long (*get_gpu_clk_rate)(struct kbase_device *kbdev,
		void *gpu_clk_handle);

	/**
	 * @gpu_clk_notifier_register: Register a clock rate change notifier.
	 * @kbdev          - kbase_device pointer
	 * @gpu_clk_handle - Handle unique to the enumerated GPU clock
	 * @nb             - notifier block containing the callback function
	 *                   pointer
	 *
	 * Returns 0 on success, negative error code otherwise.
	 *
	 * This function pointer is used to register a callback function that
	 * is supposed to be invoked whenever the rate of clock corresponding
	 * to @gpu_clk_handle changes.
	 * @nb contains the pointer to callback function.
	 * The callback function expects the pointer of type
	 * 'struct kbase_gpu_clk_notifier_data' as the third argument.
	 */
	int (*gpu_clk_notifier_register)(struct kbase_device *kbdev,
		void *gpu_clk_handle, struct notifier_block *nb);

	/**
	 * @gpu_clk_notifier_unregister: Unregister clock rate change notifier
	 * @kbdev          - kbase_device pointer
	 * @gpu_clk_handle - Handle unique to the enumerated GPU clock
	 * @nb             - notifier block containing the callback function
	 *                   pointer
	 *
	 * This function pointer is used to unregister a callback function that
	 * was previously registered to get notified of the change in rate
	 * of clock corresponding to @gpu_clk_handle.
	 */
	void (*gpu_clk_notifier_unregister)(struct kbase_device *kbdev,
		void *gpu_clk_handle, struct notifier_block *nb);
};

struct kbase_platform_specific_conf {
	struct kbase_pm_callback_conf *pm_callbacks;
	struct kbase_platform_funcs_conf *platform_funcs;
};

#if IS_ENABLED(CONFIG_OF)
struct kbase_platform_config {
};
#else

/*
 * @brief Specifies start and end of I/O memory region.
 */
struct kbase_io_memory_region {
	u64 start;
	u64 end;
};

/*
 * @brief Specifies I/O related resources like IRQs and memory region for I/O operations.
 */
struct kbase_io_resources {
	u32                      job_irq_number;
	u32                      mmu_irq_number;
	u32                      gpu_irq_number;
	struct kbase_io_memory_region io_memory_region;
};

struct kbase_platform_config {
	const struct kbase_io_resources *io_resources;
};

#endif /* CONFIG_OF */

/**
 * kbase_get_platform_config - Gets the pointer to platform config.
 *
 * Return: Pointer to the platform config
 */
struct kbase_platform_config *kbase_get_platform_config(void);

/**
 * kbasep_platform_device_init: - Platform specific call to initialize hardware
 * @kbdev: kbase device pointer
 *
 * Function calls a platform defined routine if specified in the configuration
 * attributes.  The routine can initialize any hardware and context state that
 * is required for the GPU block to function.
 *
 * Return: 0 if no errors have been found in the config.
 *         Negative error code otherwise.
 */
int kbasep_platform_device_init(struct kbase_device *kbdev);

/**
 * kbasep_platform_device_term - Platform specific call to terminate hardware
 * @kbdev: Kbase device pointer
 *
 * Function calls a platform defined routine if specified in the configuration
 * attributes. The routine can destroy any platform specific context state and
 * shut down any hardware functionality that are outside of the Power Management
 * callbacks.
 *
 */
void kbasep_platform_device_term(struct kbase_device *kbdev);

/**
 * kbasep_platform_device_late_init: - Platform specific call to finish hardware
 *                                     initialization
 * @kbdev: kbase device pointer
 *
 * Function calls a platform defined routine if specified in the configuration
 * attributes.  The routine can initialize any hardware and context state that
 * is required for the GPU block to function.
 *
 * Return: 0 if no errors have been found in the config.
 *         Negative error code otherwise.
 */
int kbasep_platform_device_late_init(struct kbase_device *kbdev);

/**
 * kbasep_platform_device_late_term - Platform specific call to finish hardware
 *                                    termination
 * @kbdev: Kbase device pointer
 *
 * Function calls a platform defined routine if specified in the configuration
 * attributes. The routine can destroy any platform specific context state and
 * shut down any hardware functionality that are outside of the Power Management
 * callbacks.
 *
 */
void kbasep_platform_device_late_term(struct kbase_device *kbdev);

#if !MALI_USE_CSF
/**
 * kbasep_platform_context_init - Platform specific callback when a kernel
 *                                context is created
 * @kctx: kbase_context pointer
 *
 * Function calls a platform defined routine if specified in the configuration
 * attributes.  The routine can initialize any per kernel context structures
 * that are required for the GPU block to function.
 *
 * Return: 0 if no errors were encountered. Negative error code otherwise.
 */
int kbasep_platform_context_init(struct kbase_context *kctx);

/**
 * kbasep_platform_context_term - Platform specific callback when a kernel
 *                                context is terminated
 * @kctx: kbase_context pointer
 *
 * Function calls a platform defined routine if specified in the configuration
 * attributes.  The routine should terminate any per kernel context structures
 * created as part of &kbasep_platform_context_init.
 *
 */
void kbasep_platform_context_term(struct kbase_context *kctx);

/**
 * kbasep_platform_event_atom_submit - Platform specific callback when an atom
 *                                     is submitted to the GPU
 * @katom: kbase_jd_atom pointer
 *
 * Function calls a platform defined routine if specified in the configuration
 * attributes.  The routine should not assume that it is in a process context.
 *
 * Return: 0 if no errors were encountered. Negative error code otherwise.
 */
void kbasep_platform_event_atom_submit(struct kbase_jd_atom *katom);

/**
 * kbasep_platform_event_atom_complete - Platform specific callback when an atom
 *                                       has stopped running on the GPU
 * @katom: kbase_jd_atom pointer
 *
 * Function calls a platform defined routine if specified in the configuration
 * attributes.  The routine should not assume that it is in a process context.
 *
 */
void kbasep_platform_event_atom_complete(struct kbase_jd_atom *katom);
#endif

#ifndef CONFIG_OF
/**
 * kbase_platform_register - Register a platform device for the GPU
 * This can be used to register a platform device on systems where device tree
 * is not enabled and the platform initialisation code in the kernel doesn't
 * create the GPU device. Where possible device tree should be used instead.
 *
 * Return: 0 for success, any other fail causes module initialisation to fail
 */
int kbase_platform_register(void);

/**
 * kbase_platform_unregister - Unregister a fake platform device
 *
 * Unregister the platform device created with kbase_platform_register()
 */
void kbase_platform_unregister(void);
#endif

#endif				/* _KBASE_CONFIG_H_ */