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linux-headers-6.8.0-36
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bus.h
/* 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; struct device_dma_parameters dma_parms; unsigned int periphid; struct mutex periphid_lock; unsigned int cid; struct amba_cs_uci_id uci; unsigned int irq[AMBA_NR_IRQS]; /* * Driver name to force a match. Do not set directly, because core * frees it. Use driver_set_override() to set or clear it. */ const char *driver_override; }; struct amba_driver { struct device_driver drv; int (*probe)(struct amba_device *, const struct amba_id *); void (*remove)(struct amba_device *); void (*shutdown)(struct amba_device *); const struct amba_id *id_table; /* * For most device drivers, no need to care about this flag as long as * all DMAs are handled through the kernel DMA API. For some special * ones, for example VFIO drivers, they know how to manage the DMA * themselves and set this flag so that the IOMMU layer will allow them * to setup and manage their own I/O address space. */ bool driver_managed_dma; }; /* * 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, }; extern struct bus_type amba_bustype; #define to_amba_device(d) container_of_const(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) #ifdef CONFIG_ARM_AMBA int amba_driver_register(struct amba_driver *); void amba_driver_unregister(struct amba_driver *); #else static inline int amba_driver_register(struct amba_driver *drv) { return -EINVAL; } static inline void amba_driver_unregister(struct amba_driver *drv) { } #endif 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 *); void amba_device_unregister(struct amba_device *); int amba_request_regions(struct amba_device *, const char *); void amba_release_regions(struct amba_device *); /* 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
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