arch/x86/include/asm/iosf_mbi.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Intel OnChip System Fabric MailBox access support
  */

 #ifndef IOSF_MBI_SYMS_H
 #define IOSF_MBI_SYMS_H

 #include <linux/notifier.h>

 #define MBI_MCR_OFFSET		0xD0
 #define MBI_MDR_OFFSET		0xD4
 #define MBI_MCRX_OFFSET		0xD8

 #define MBI_RD_MASK		0xFEFFFFFF
 #define MBI_WR_MASK		0X01000000

 #define MBI_MASK_HI		0xFFFFFF00
 #define MBI_MASK_LO		0x000000FF
 #define MBI_ENABLE		0xF0

 /* IOSF SB read/write opcodes */
 #define MBI_MMIO_READ		0x00
 #define MBI_MMIO_WRITE		0x01
 #define MBI_CFG_READ		0x04
 #define MBI_CFG_WRITE		0x05
 #define MBI_CR_READ		0x06
 #define MBI_CR_WRITE		0x07
 #define MBI_REG_READ		0x10
 #define MBI_REG_WRITE		0x11
 #define MBI_ESRAM_READ		0x12
 #define MBI_ESRAM_WRITE		0x13

 /* Baytrail available units */
 #define BT_MBI_UNIT_AUNIT	0x00
 #define BT_MBI_UNIT_SMC		0x01
 #define BT_MBI_UNIT_CPU		0x02
 #define BT_MBI_UNIT_BUNIT	0x03
 #define BT_MBI_UNIT_PMC		0x04
 #define BT_MBI_UNIT_GFX		0x06
 #define BT_MBI_UNIT_SMI		0x0C
 #define BT_MBI_UNIT_USB		0x43
 #define BT_MBI_UNIT_SATA	0xA3
 #define BT_MBI_UNIT_PCIE	0xA6

 /* Quark available units */
 #define QRK_MBI_UNIT_HBA	0x00
 #define QRK_MBI_UNIT_HB		0x03
 #define QRK_MBI_UNIT_RMU	0x04
 #define QRK_MBI_UNIT_MM		0x05
 #define QRK_MBI_UNIT_SOC	0x31

 /* Action values for the pmic_bus_access_notifier functions */
 #define MBI_PMIC_BUS_ACCESS_BEGIN	1
 #define MBI_PMIC_BUS_ACCESS_END		2

 #if IS_ENABLED(CONFIG_IOSF_MBI)

 bool iosf_mbi_available(void);

 /**
  * iosf_mbi_read() - MailBox Interface read command
  * @port:	port indicating subunit being accessed
  * @opcode:	port specific read or write opcode
  * @offset:	register address offset
  * @mdr:	register data to be read
  *
  * Locking is handled by spinlock - cannot sleep.
  * Return: Nonzero on error
  */
 int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr);

 /**
  * iosf_mbi_write() - MailBox unmasked write command
  * @port:	port indicating subunit being accessed
  * @opcode:	port specific read or write opcode
  * @offset:	register address offset
  * @mdr:	register data to be written
  *
  * Locking is handled by spinlock - cannot sleep.
  * Return: Nonzero on error
  */
 int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr);

 /**
  * iosf_mbi_modify() - MailBox masked write command
  * @port:	port indicating subunit being accessed
  * @opcode:	port specific read or write opcode
  * @offset:	register address offset
  * @mdr:	register data being modified
  * @mask:	mask indicating bits in mdr to be modified
  *
  * Locking is handled by spinlock - cannot sleep.
  * Return: Nonzero on error
  */
 int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask);

 /**
  * iosf_mbi_punit_acquire() - Acquire access to the P-Unit
  *
  * One some systems the P-Unit accesses the PMIC to change various voltages
  * through the same bus as other kernel drivers use for e.g. battery monitoring.
  *
  * If a driver sends requests to the P-Unit which require the P-Unit to access
  * the PMIC bus while another driver is also accessing the PMIC bus various bad
  * things happen.
  *
  * Call this function before sending requests to the P-Unit which may make it
  * access the PMIC, be it through iosf_mbi* functions or through other means.
  * This function will block all kernel access to the PMIC I2C bus, so that the
  * P-Unit can safely access the PMIC over the shared I2C bus.
  *
  * Note on these systems the i2c-bus driver will request a sempahore from the
  * P-Unit for exclusive access to the PMIC bus when i2c drivers are accessing
  * it, but this does not appear to be sufficient, we still need to avoid making
  * certain P-Unit requests during the access window to avoid problems.
  *
  * This function locks a mutex, as such it may sleep.
  */
 void iosf_mbi_punit_acquire(void);

 /**
  * iosf_mbi_punit_release() - Release access to the P-Unit
  */
 void iosf_mbi_punit_release(void);

 /**
  * iosf_mbi_block_punit_i2c_access() - Block P-Unit accesses to the PMIC bus
  *
  * Call this function to block P-Unit access to the PMIC I2C bus, so that the
  * kernel can safely access the PMIC over the shared I2C bus.
  *
  * This function acquires the P-Unit bus semaphore and notifies
  * pmic_bus_access_notifier listeners that they may no longer access the
  * P-Unit in a way which may cause it to access the shared I2C bus.
  *
  * Note this function may be called multiple times and the bus will not
  * be released until iosf_mbi_unblock_punit_i2c_access() has been called the
  * same amount of times.
  *
  * Return: Nonzero on error
  */
 int iosf_mbi_block_punit_i2c_access(void);

 /*
  * iosf_mbi_unblock_punit_i2c_access() - Release PMIC I2C bus block
  *
  * Release i2c access block gotten through iosf_mbi_block_punit_i2c_access().
  */
 void iosf_mbi_unblock_punit_i2c_access(void);

 /**
  * iosf_mbi_register_pmic_bus_access_notifier - Register PMIC bus notifier
  *
  * This function can be used by drivers which may need to acquire P-Unit
  * managed resources from interrupt context, where iosf_mbi_punit_acquire()
  * can not be used.
  *
  * This function allows a driver to register a notifier to get notified (in a
  * process context) before other drivers start accessing the PMIC bus.
  *
  * This allows the driver to acquire any resources, which it may need during
  * the window the other driver is accessing the PMIC, before hand.
  *
  * @nb: notifier_block to register
  */
 int iosf_mbi_register_pmic_bus_access_notifier(struct notifier_block *nb);

 /**
  * iosf_mbi_register_pmic_bus_access_notifier - Unregister PMIC bus notifier
  *
  * @nb: notifier_block to unregister
  */
 int iosf_mbi_unregister_pmic_bus_access_notifier(struct notifier_block *nb);

 /**
  * iosf_mbi_unregister_pmic_bus_access_notifier_unlocked - Unregister PMIC bus
  *                                                         notifier, unlocked
  *
  * Like iosf_mbi_unregister_pmic_bus_access_notifier(), but for use when the
  * caller has already called iosf_mbi_punit_acquire() itself.
  *
  * @nb: notifier_block to unregister
  */
 int iosf_mbi_unregister_pmic_bus_access_notifier_unlocked(
 	struct notifier_block *nb);

 /**
  * iosf_mbi_assert_punit_acquired - Assert that the P-Unit has been acquired.
  */
 void iosf_mbi_assert_punit_acquired(void);

 #else /* CONFIG_IOSF_MBI is not enabled */
 static inline
 bool iosf_mbi_available(void)
 {
 	return false;
 }

 static inline
 int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr)
 {
 	WARN(1, "IOSF_MBI driver not available");
 	return -EPERM;
 }

 static inline
 int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr)
 {
 	WARN(1, "IOSF_MBI driver not available");
 	return -EPERM;
 }

 static inline
 int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask)
 {
 	WARN(1, "IOSF_MBI driver not available");
 	return -EPERM;
 }

 static inline void iosf_mbi_punit_acquire(void) {}
 static inline void iosf_mbi_punit_release(void) {}

 static inline
 int iosf_mbi_register_pmic_bus_access_notifier(struct notifier_block *nb)
 {
 	return 0;
 }

 static inline
 int iosf_mbi_unregister_pmic_bus_access_notifier(struct notifier_block *nb)
 {
 	return 0;
 }

 static inline int
 iosf_mbi_unregister_pmic_bus_access_notifier_unlocked(struct notifier_block *nb)
 {
 	return 0;
 }

 static inline
 int iosf_mbi_call_pmic_bus_access_notifier_chain(unsigned long val, void *v)
 {
 	return 0;
 }

 static inline void iosf_mbi_assert_punit_acquired(void) {}

 #endif /* CONFIG_IOSF_MBI */

 #endif /* IOSF_MBI_SYMS_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	* Intel OnChip System Fabric MailBox access support
	*/

	#ifndef IOSF_MBI_SYMS_H
	#define IOSF_MBI_SYMS_H

	#include <linux/notifier.h>

	#define MBI_MCR_OFFSET 0xD0
	#define MBI_MDR_OFFSET 0xD4
	#define MBI_MCRX_OFFSET 0xD8

	#define MBI_RD_MASK 0xFEFFFFFF
	#define MBI_WR_MASK 0X01000000

	#define MBI_MASK_HI 0xFFFFFF00
	#define MBI_MASK_LO 0x000000FF
	#define MBI_ENABLE 0xF0

	/* IOSF SB read/write opcodes */
	#define MBI_MMIO_READ 0x00
	#define MBI_MMIO_WRITE 0x01
	#define MBI_CFG_READ 0x04
	#define MBI_CFG_WRITE 0x05
	#define MBI_CR_READ 0x06
	#define MBI_CR_WRITE 0x07
	#define MBI_REG_READ 0x10
	#define MBI_REG_WRITE 0x11
	#define MBI_ESRAM_READ 0x12
	#define MBI_ESRAM_WRITE 0x13

	/* Baytrail available units */
	#define BT_MBI_UNIT_AUNIT 0x00
	#define BT_MBI_UNIT_SMC 0x01
	#define BT_MBI_UNIT_CPU 0x02
	#define BT_MBI_UNIT_BUNIT 0x03
	#define BT_MBI_UNIT_PMC 0x04
	#define BT_MBI_UNIT_GFX 0x06
	#define BT_MBI_UNIT_SMI 0x0C
	#define BT_MBI_UNIT_USB 0x43
	#define BT_MBI_UNIT_SATA 0xA3
	#define BT_MBI_UNIT_PCIE 0xA6

	/* Quark available units */
	#define QRK_MBI_UNIT_HBA 0x00
	#define QRK_MBI_UNIT_HB 0x03
	#define QRK_MBI_UNIT_RMU 0x04
	#define QRK_MBI_UNIT_MM 0x05
	#define QRK_MBI_UNIT_SOC 0x31

	/* Action values for the pmic_bus_access_notifier functions */
	#define MBI_PMIC_BUS_ACCESS_BEGIN 1
	#define MBI_PMIC_BUS_ACCESS_END 2

	#if IS_ENABLED(CONFIG_IOSF_MBI)

	bool iosf_mbi_available(void);

	/**
	* iosf_mbi_read() - MailBox Interface read command
	* @port: port indicating subunit being accessed
	* @opcode: port specific read or write opcode
	* @offset: register address offset
	* @mdr: register data to be read
	*
	* Locking is handled by spinlock - cannot sleep.
	* Return: Nonzero on error
	*/
	int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr);

	/**
	* iosf_mbi_write() - MailBox unmasked write command
	* @port: port indicating subunit being accessed
	* @opcode: port specific read or write opcode
	* @offset: register address offset
	* @mdr: register data to be written
	*
	* Locking is handled by spinlock - cannot sleep.
	* Return: Nonzero on error
	*/
	int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr);

	/**
	* iosf_mbi_modify() - MailBox masked write command
	* @port: port indicating subunit being accessed
	* @opcode: port specific read or write opcode
	* @offset: register address offset
	* @mdr: register data being modified
	* @mask: mask indicating bits in mdr to be modified
	*
	* Locking is handled by spinlock - cannot sleep.
	* Return: Nonzero on error
	*/
	int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask);

	/**
	* iosf_mbi_punit_acquire() - Acquire access to the P-Unit
	*
	* One some systems the P-Unit accesses the PMIC to change various voltages
	* through the same bus as other kernel drivers use for e.g. battery monitoring.
	*
	* If a driver sends requests to the P-Unit which require the P-Unit to access
	* the PMIC bus while another driver is also accessing the PMIC bus various bad
	* things happen.
	*
	* Call this function before sending requests to the P-Unit which may make it
	* access the PMIC, be it through iosf_mbi* functions or through other means.
	* This function will block all kernel access to the PMIC I2C bus, so that the
	* P-Unit can safely access the PMIC over the shared I2C bus.
	*
	* Note on these systems the i2c-bus driver will request a sempahore from the
	* P-Unit for exclusive access to the PMIC bus when i2c drivers are accessing
	* it, but this does not appear to be sufficient, we still need to avoid making
	* certain P-Unit requests during the access window to avoid problems.
	*
	* This function locks a mutex, as such it may sleep.
	*/
	void iosf_mbi_punit_acquire(void);

	/**
	* iosf_mbi_punit_release() - Release access to the P-Unit
	*/
	void iosf_mbi_punit_release(void);

	/**
	* iosf_mbi_block_punit_i2c_access() - Block P-Unit accesses to the PMIC bus
	*
	* Call this function to block P-Unit access to the PMIC I2C bus, so that the
	* kernel can safely access the PMIC over the shared I2C bus.
	*
	* This function acquires the P-Unit bus semaphore and notifies
	* pmic_bus_access_notifier listeners that they may no longer access the
	* P-Unit in a way which may cause it to access the shared I2C bus.
	*
	* Note this function may be called multiple times and the bus will not
	* be released until iosf_mbi_unblock_punit_i2c_access() has been called the
	* same amount of times.
	*
	* Return: Nonzero on error
	*/
	int iosf_mbi_block_punit_i2c_access(void);

	/*
	* iosf_mbi_unblock_punit_i2c_access() - Release PMIC I2C bus block
	*
	* Release i2c access block gotten through iosf_mbi_block_punit_i2c_access().
	*/
	void iosf_mbi_unblock_punit_i2c_access(void);

	/**
	* iosf_mbi_register_pmic_bus_access_notifier - Register PMIC bus notifier
	*
	* This function can be used by drivers which may need to acquire P-Unit
	* managed resources from interrupt context, where iosf_mbi_punit_acquire()
	* can not be used.
	*
	* This function allows a driver to register a notifier to get notified (in a
	* process context) before other drivers start accessing the PMIC bus.
	*
	* This allows the driver to acquire any resources, which it may need during
	* the window the other driver is accessing the PMIC, before hand.
	*
	* @nb: notifier_block to register
	*/
	int iosf_mbi_register_pmic_bus_access_notifier(struct notifier_block *nb);

	/**
	* iosf_mbi_register_pmic_bus_access_notifier - Unregister PMIC bus notifier
	*
	* @nb: notifier_block to unregister
	*/
	int iosf_mbi_unregister_pmic_bus_access_notifier(struct notifier_block *nb);

	/**
	* iosf_mbi_unregister_pmic_bus_access_notifier_unlocked - Unregister PMIC bus
	* notifier, unlocked
	*
	* Like iosf_mbi_unregister_pmic_bus_access_notifier(), but for use when the
	* caller has already called iosf_mbi_punit_acquire() itself.
	*
	* @nb: notifier_block to unregister
	*/
	int iosf_mbi_unregister_pmic_bus_access_notifier_unlocked(
	struct notifier_block *nb);

	/**
	* iosf_mbi_assert_punit_acquired - Assert that the P-Unit has been acquired.
	*/
	void iosf_mbi_assert_punit_acquired(void);

	#else /* CONFIG_IOSF_MBI is not enabled */
	static inline
	bool iosf_mbi_available(void)
	{
	return false;
	}

	static inline
	int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr)
	{
	WARN(1, "IOSF_MBI driver not available");
	return -EPERM;
	}

	static inline
	int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr)
	{
	WARN(1, "IOSF_MBI driver not available");
	return -EPERM;
	}

	static inline
	int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask)
	{
	WARN(1, "IOSF_MBI driver not available");
	return -EPERM;
	}

	static inline void iosf_mbi_punit_acquire(void) {}
	static inline void iosf_mbi_punit_release(void) {}

	static inline
	int iosf_mbi_register_pmic_bus_access_notifier(struct notifier_block *nb)
	{
	return 0;
	}

	static inline
	int iosf_mbi_unregister_pmic_bus_access_notifier(struct notifier_block *nb)
	{
	return 0;
	}

	static inline int
	iosf_mbi_unregister_pmic_bus_access_notifier_unlocked(struct notifier_block *nb)
	{
	return 0;
	}

	static inline
	int iosf_mbi_call_pmic_bus_access_notifier_chain(unsigned long val, void *v)
	{
	return 0;
	}

	static inline void iosf_mbi_assert_punit_acquired(void) {}

	#endif /* CONFIG_IOSF_MBI */

	#endif /* IOSF_MBI_SYMS_H */