bus.h
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/*
* 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.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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
struct clk;
struct amba_device {
struct device dev;
struct resource res;
struct clk *pclk;
unsigned int periphid;
unsigned int irq[AMBA_NR_IRQS];
};
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 *);
int (*suspend)(struct amba_device *, pm_message_t);
int (*resume)(struct amba_device *);
const struct amba_id *id_table;
};
enum amba_vendor {
AMBA_VENDOR_ARM = 0x41,
AMBA_VENDOR_ST = 0x80,
};
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 *);
#define amba_pclk_enable(d) \
(IS_ERR((d)->pclk) ? 0 : clk_enable((d)->pclk))
#define amba_pclk_disable(d) \
do { if (!IS_ERR((d)->pclk)) clk_disable((d)->pclk); } while (0)
/* 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)
#endif