/* 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
/* * 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 { unsignedint devarch; unsignedint devarch_mask; unsignedint 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; unsignedint periphid; struct mutex periphid_lock; unsignedint cid; struct amba_cs_uci_id uci; unsignedint 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.
*/ constchar *driver_override;
};
struct amba_driver { struct device_driver drv; int (*probe)(struct amba_device *, conststruct amba_id *); void (*remove)(struct amba_device *); void (*shutdown)(struct amba_device *); conststruct 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,
};
/* * 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, \
}
/* * 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)
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