include/linux/amba/bus.h - kernel/common - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *  linux/include/amba/bus.h
  *
  *  This device type deals with ARM PrimeCells and anything else that
  *  presents a proper CID (0xB105F00D) at the end of the I/O register
  *  region or that is derived from a PrimeCell.
  *
  *  Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
  */
 #ifndef ASMARM_AMBA_H
 #define ASMARM_AMBA_H

 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
 #include <linux/err.h>
 #include <linux/resource.h>
 #include <linux/regulator/consumer.h>

 #define AMBA_NR_IRQS	9
 #define AMBA_CID	0xb105f00d
 #define CORESIGHT_CID	0xb105900d

 /*
  * CoreSight Architecture specification updates the ID specification
  * for components on the AMBA bus. (ARM IHI 0029E)
  *
  * Bits 15:12 of the CID are the device class.
  *
  * Class 0xF remains for PrimeCell and legacy components. (AMBA_CID above)
  * Class 0x9 defines the component as CoreSight (CORESIGHT_CID above)
  * Class 0x0, 0x1, 0xB, 0xE define components that do not have driver support
  * at present.
  * Class 0x2-0x8,0xA and 0xD-0xD are presently reserved.
  *
  * Remaining CID bits stay as 0xb105-00d
  */

 /**
  * Class 0x9 components use additional values to form a Unique Component
  * Identifier (UCI), where peripheral ID values are identical for different
  * components. Passed to the amba bus code from the component driver via
  * the amba_id->data pointer.
  * @devarch	: coresight devarch register value
  * @devarch_mask: mask bits used for matching. 0 indicates UCI not used.
  * @devtype	: coresight device type value
  * @data	: additional driver data. As we have usurped the original
  *		pointer some devices may still need additional data
  */
 struct amba_cs_uci_id {
 	unsigned int devarch;
 	unsigned int devarch_mask;
 	unsigned int devtype;
 	void *data;
 };

 /* define offsets for registers used by UCI */
 #define UCI_REG_DEVTYPE_OFFSET	0xFCC
 #define UCI_REG_DEVARCH_OFFSET	0xFBC

 struct clk;

 struct amba_device {
 	struct device		dev;
 	struct resource		res;
 	struct clk		*pclk;
 	unsigned int		periphid;
 	unsigned int		cid;
 	struct amba_cs_uci_id	uci;
 	unsigned int		irq[AMBA_NR_IRQS];
 	char			*driver_override;
 };

 struct amba_driver {
 	struct device_driver	drv;
 	int			(*probe)(struct amba_device *, const struct amba_id *);
 	int			(*remove)(struct amba_device *);
 	void			(*shutdown)(struct amba_device *);
 	const struct amba_id	*id_table;
 };

 /*
  * Constants for the designer field of the Peripheral ID register. When bit 7
  * is set to '1', bits [6:0] should be the JEP106 manufacturer identity code.
  */
 enum amba_vendor {
 	AMBA_VENDOR_ARM = 0x41,
 	AMBA_VENDOR_ST = 0x80,
 	AMBA_VENDOR_QCOM = 0x51,
 	AMBA_VENDOR_LSI = 0xb6,
 	AMBA_VENDOR_LINUX = 0xfe,	/* This value is not official */
 };

 /* This is used to generate pseudo-ID for AMBA device */
 #define AMBA_LINUX_ID(conf, rev, part) \
 	(((conf) & 0xff) << 24 | ((rev) & 0xf) << 20 | \
 	AMBA_VENDOR_LINUX << 12 | ((part) & 0xfff))

 extern struct bus_type amba_bustype;

 #define to_amba_device(d)	container_of(d, struct amba_device, dev)

 #define amba_get_drvdata(d)	dev_get_drvdata(&d->dev)
 #define amba_set_drvdata(d,p)	dev_set_drvdata(&d->dev, p)

 int amba_driver_register(struct amba_driver *);
 void amba_driver_unregister(struct amba_driver *);
 struct amba_device *amba_device_alloc(const char *, resource_size_t, size_t);
 void amba_device_put(struct amba_device *);
 int amba_device_add(struct amba_device *, struct resource *);
 int amba_device_register(struct amba_device *, struct resource *);
 struct amba_device *amba_apb_device_add(struct device *parent, const char *name,
 					resource_size_t base, size_t size,
 					int irq1, int irq2, void *pdata,
 					unsigned int periphid);
 struct amba_device *amba_ahb_device_add(struct device *parent, const char *name,
 					resource_size_t base, size_t size,
 					int irq1, int irq2, void *pdata,
 					unsigned int periphid);
 struct amba_device *
 amba_apb_device_add_res(struct device *parent, const char *name,
 			resource_size_t base, size_t size, int irq1,
 			int irq2, void *pdata, unsigned int periphid,
 			struct resource *resbase);
 struct amba_device *
 amba_ahb_device_add_res(struct device *parent, const char *name,
 			resource_size_t base, size_t size, int irq1,
 			int irq2, void *pdata, unsigned int periphid,
 			struct resource *resbase);
 void amba_device_unregister(struct amba_device *);
 struct amba_device *amba_find_device(const char *, struct device *, unsigned int, unsigned int);
 int amba_request_regions(struct amba_device *, const char *);
 void amba_release_regions(struct amba_device *);

 static inline int amba_pclk_enable(struct amba_device *dev)
 {
 	return clk_enable(dev->pclk);
 }

 static inline void amba_pclk_disable(struct amba_device *dev)
 {
 	clk_disable(dev->pclk);
 }

 static inline int amba_pclk_prepare(struct amba_device *dev)
 {
 	return clk_prepare(dev->pclk);
 }

 static inline void amba_pclk_unprepare(struct amba_device *dev)
 {
 	clk_unprepare(dev->pclk);
 }

 /* Some drivers don't use the struct amba_device */
 #define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
 #define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
 #define AMBA_MANF_BITS(a) (((a) >> 12) & 0xff)
 #define AMBA_PART_BITS(a) ((a) & 0xfff)

 #define amba_config(d)	AMBA_CONFIG_BITS((d)->periphid)
 #define amba_rev(d)	AMBA_REV_BITS((d)->periphid)
 #define amba_manf(d)	AMBA_MANF_BITS((d)->periphid)
 #define amba_part(d)	AMBA_PART_BITS((d)->periphid)

 #define __AMBA_DEV(busid, data, mask)				\
 	{							\
 		.coherent_dma_mask = mask,			\
 		.init_name = busid,				\
 		.platform_data = data,				\
 	}

 /*
  * APB devices do not themselves have the ability to address memory,
  * so DMA masks should be zero (much like USB peripheral devices.)
  * The DMA controller DMA masks should be used instead (much like
  * USB host controllers in conventional PCs.)
  */
 #define AMBA_APB_DEVICE(name, busid, id, base, irqs, data)	\
 struct amba_device name##_device = {				\
 	.dev = __AMBA_DEV(busid, data, 0),			\
 	.res = DEFINE_RES_MEM(base, SZ_4K),			\
 	.irq = irqs,						\
 	.periphid = id,						\
 }

 /*
  * AHB devices are DMA capable, so set their DMA masks
  */
 #define AMBA_AHB_DEVICE(name, busid, id, base, irqs, data)	\
 struct amba_device name##_device = {				\
 	.dev = __AMBA_DEV(busid, data, ~0ULL),			\
 	.res = DEFINE_RES_MEM(base, SZ_4K),			\
 	.irq = irqs,						\
 	.periphid = id,						\
 }

 /*
  * module_amba_driver() - Helper macro for drivers that don't do anything
  * special in module init/exit.  This eliminates a lot of boilerplate.  Each
  * module may only use this macro once, and calling it replaces module_init()
  * and module_exit()
  */
 #define module_amba_driver(__amba_drv) \
 	module_driver(__amba_drv, amba_driver_register, amba_driver_unregister)

 /*
  * builtin_amba_driver() - Helper macro for drivers that don't do anything
  * special in driver initcall.  This eliminates a lot of boilerplate.  Each
  * driver may only use this macro once, and calling it replaces the instance
  * device_initcall().
  */
 #define builtin_amba_driver(__amba_drv) \
 	builtin_driver(__amba_drv, amba_driver_register)

 #endif
	/* SPDX-License-Identifier: GPL-2.0-only */
	/*
	* linux/include/amba/bus.h
	*
	* This device type deals with ARM PrimeCells and anything else that
	* presents a proper CID (0xB105F00D) at the end of the I/O register
	* region or that is derived from a PrimeCell.
	*
	* Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
	*/
	#ifndef ASMARM_AMBA_H
	#define ASMARM_AMBA_H

	#include <linux/clk.h>
	#include <linux/device.h>
	#include <linux/mod_devicetable.h>
	#include <linux/err.h>
	#include <linux/resource.h>
	#include <linux/regulator/consumer.h>

	#define AMBA_NR_IRQS 9
	#define AMBA_CID 0xb105f00d
	#define CORESIGHT_CID 0xb105900d

	/*
	* CoreSight Architecture specification updates the ID specification
	* for components on the AMBA bus. (ARM IHI 0029E)
	*
	* Bits 15:12 of the CID are the device class.
	*
	* Class 0xF remains for PrimeCell and legacy components. (AMBA_CID above)
	* Class 0x9 defines the component as CoreSight (CORESIGHT_CID above)
	* Class 0x0, 0x1, 0xB, 0xE define components that do not have driver support
	* at present.
	* Class 0x2-0x8,0xA and 0xD-0xD are presently reserved.
	*
	* Remaining CID bits stay as 0xb105-00d
	*/

	/**
	* Class 0x9 components use additional values to form a Unique Component
	* Identifier (UCI), where peripheral ID values are identical for different
	* components. Passed to the amba bus code from the component driver via
	* the amba_id->data pointer.
	* @devarch : coresight devarch register value
	* @devarch_mask: mask bits used for matching. 0 indicates UCI not used.
	* @devtype : coresight device type value
	* @data : additional driver data. As we have usurped the original
	* pointer some devices may still need additional data
	*/
	struct amba_cs_uci_id {
	unsigned int devarch;
	unsigned int devarch_mask;
	unsigned int devtype;
	void *data;
	};

	/* define offsets for registers used by UCI */
	#define UCI_REG_DEVTYPE_OFFSET 0xFCC
	#define UCI_REG_DEVARCH_OFFSET 0xFBC

	struct clk;

	struct amba_device {
	struct device dev;
	struct resource res;
	struct clk *pclk;
	unsigned int periphid;
	unsigned int cid;
	struct amba_cs_uci_id uci;
	unsigned int irq[AMBA_NR_IRQS];
	char *driver_override;
	};

	struct amba_driver {
	struct device_driver drv;
	int (probe)(struct amba_device , const struct amba_id *);
	int (remove)(struct amba_device );
	void (shutdown)(struct amba_device );
	const struct amba_id *id_table;
	};

	/*
	* Constants for the designer field of the Peripheral ID register. When bit 7
	* is set to '1', bits [6:0] should be the JEP106 manufacturer identity code.
	*/
	enum amba_vendor {
	AMBA_VENDOR_ARM = 0x41,
	AMBA_VENDOR_ST = 0x80,
	AMBA_VENDOR_QCOM = 0x51,
	AMBA_VENDOR_LSI = 0xb6,
	AMBA_VENDOR_LINUX = 0xfe, /* This value is not official */
	};

	/* This is used to generate pseudo-ID for AMBA device */
	#define AMBA_LINUX_ID(conf, rev, part) \
	(((conf) & 0xff) << 24 \| ((rev) & 0xf) << 20 \| \
	AMBA_VENDOR_LINUX << 12 \| ((part) & 0xfff))

	extern struct bus_type amba_bustype;

	#define to_amba_device(d) container_of(d, struct amba_device, dev)

	#define amba_get_drvdata(d) dev_get_drvdata(&d->dev)
	#define amba_set_drvdata(d,p) dev_set_drvdata(&d->dev, p)

	int amba_driver_register(struct amba_driver *);
	void amba_driver_unregister(struct amba_driver *);
	struct amba_device amba_device_alloc(const char , resource_size_t, size_t);
	void amba_device_put(struct amba_device *);
	int amba_device_add(struct amba_device , struct resource );
	int amba_device_register(struct amba_device , struct resource );
	struct amba_device amba_apb_device_add(struct device parent, const char *name,
	resource_size_t base, size_t size,
	int irq1, int irq2, void *pdata,
	unsigned int periphid);
	struct amba_device amba_ahb_device_add(struct device parent, const char *name,
	resource_size_t base, size_t size,
	int irq1, int irq2, void *pdata,
	unsigned int periphid);
	struct amba_device *
	amba_apb_device_add_res(struct device parent, const char name,
	resource_size_t base, size_t size, int irq1,
	int irq2, void *pdata, unsigned int periphid,
	struct resource *resbase);
	struct amba_device *
	amba_ahb_device_add_res(struct device parent, const char name,
	resource_size_t base, size_t size, int irq1,
	int irq2, void *pdata, unsigned int periphid,
	struct resource *resbase);
	void amba_device_unregister(struct amba_device *);
	struct amba_device amba_find_device(const char , struct device *, unsigned int, unsigned int);
	int amba_request_regions(struct amba_device , const char );
	void amba_release_regions(struct amba_device *);

	static inline int amba_pclk_enable(struct amba_device *dev)
	{
	return clk_enable(dev->pclk);
	}

	static inline void amba_pclk_disable(struct amba_device *dev)
	{
	clk_disable(dev->pclk);
	}

	static inline int amba_pclk_prepare(struct amba_device *dev)
	{
	return clk_prepare(dev->pclk);
	}

	static inline void amba_pclk_unprepare(struct amba_device *dev)
	{
	clk_unprepare(dev->pclk);
	}

	/* Some drivers don't use the struct amba_device */
	#define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
	#define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
	#define AMBA_MANF_BITS(a) (((a) >> 12) & 0xff)
	#define AMBA_PART_BITS(a) ((a) & 0xfff)

	#define amba_config(d) AMBA_CONFIG_BITS((d)->periphid)
	#define amba_rev(d) AMBA_REV_BITS((d)->periphid)
	#define amba_manf(d) AMBA_MANF_BITS((d)->periphid)
	#define amba_part(d) AMBA_PART_BITS((d)->periphid)

	#define __AMBA_DEV(busid, data, mask) \
	{ \
	.coherent_dma_mask = mask, \
	.init_name = busid, \
	.platform_data = data, \
	}

	/*
	* APB devices do not themselves have the ability to address memory,
	* so DMA masks should be zero (much like USB peripheral devices.)
	* The DMA controller DMA masks should be used instead (much like
	* USB host controllers in conventional PCs.)
	*/
	#define AMBA_APB_DEVICE(name, busid, id, base, irqs, data) \
	struct amba_device name##_device = { \
	.dev = __AMBA_DEV(busid, data, 0), \
	.res = DEFINE_RES_MEM(base, SZ_4K), \
	.irq = irqs, \
	.periphid = id, \
	}

	/*
	* AHB devices are DMA capable, so set their DMA masks
	*/
	#define AMBA_AHB_DEVICE(name, busid, id, base, irqs, data) \
	struct amba_device name##_device = { \
	.dev = __AMBA_DEV(busid, data, ~0ULL), \
	.res = DEFINE_RES_MEM(base, SZ_4K), \
	.irq = irqs, \
	.periphid = id, \
	}

	/*
	* module_amba_driver() - Helper macro for drivers that don't do anything
	* special in module init/exit. This eliminates a lot of boilerplate. Each
	* module may only use this macro once, and calling it replaces module_init()
	* and module_exit()
	*/
	#define module_amba_driver(__amba_drv) \
	module_driver(__amba_drv, amba_driver_register, amba_driver_unregister)

	/*
	* builtin_amba_driver() - Helper macro for drivers that don't do anything
	* special in driver initcall. This eliminates a lot of boilerplate. Each
	* driver may only use this macro once, and calling it replaces the instance
	* device_initcall().
	*/
	#define builtin_amba_driver(__amba_drv) \
	builtin_driver(__amba_drv, amba_driver_register)

	#endif