diff options
Diffstat (limited to 'include/linux/amba/bus.h')
| -rw-r--r-- | include/linux/amba/bus.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h new file mode 100644 index 0000000000..cb3e3bd3b1 --- /dev/null +++ b/include/linux/amba/bus.h @@ -0,0 +1,153 @@ +/* + * 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 <driver.h> +#include <linux/err.h> + +#define AMBA_CID 0xb105f00d + +/** + * struct amba_id - identifies a device on an AMBA bus + * @id: The significant bits if the hardware device ID + * @mask: Bitmask specifying which bits of the id field are significant when + * matching. A driver binds to a device when ((hardware device ID) & mask) + * == id. + * @data: Private data used by the driver. + */ +struct amba_id { + unsigned int id; + unsigned int mask; + void *data; +}; + +struct clk; + +struct amba_device { + struct device_d dev; + struct resource res; + void __iomem *base; + struct clk *pclk; + unsigned int periphid; +}; + +struct amba_driver { + struct driver_d drv; + int (*probe)(struct amba_device *, const struct amba_id *); + int (*remove)(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 *, int id, resource_size_t, size_t); +void amba_device_put(struct amba_device *); +int amba_device_add(struct amba_device *); +int amba_device_register(struct amba_device *, struct resource *); + +struct amba_device * +amba_aphb_device_add(struct device_d *parent, const char *name, int id, + resource_size_t base, size_t size, + void *pdata, unsigned int periphid); + +static inline struct amba_device * +amba_apb_device_add(struct device_d *parent, const char *name, int id, + resource_size_t base, size_t size, + void *pdata, unsigned int periphid) +{ + return amba_aphb_device_add(parent, name, id, base, size, pdata, + periphid); +} + +static inline struct amba_device * +amba_ahb_device_add(struct device_d *parent, const char *name, int id, + resource_size_t base, size_t size, + void *pdata, unsigned int periphid) +{ + return amba_aphb_device_add(parent, name, id, base, size, pdata, + periphid); +} + + +void amba_device_unregister(struct amba_device *); +struct amba_device *amba_find_device(const char *, struct device_d *, unsigned int, unsigned int); +int amba_request_regions(struct amba_device *, const char *); +void amba_release_regions(struct amba_device *); + +static inline void __iomem *amba_get_mem_region(struct amba_device *dev) +{ + return dev->base; +} + +#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) \ + { \ + .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, data) \ +struct amba_device name##_device = { \ + .dev = __AMBA_DEV(busid, data), \ + .res = DEFINE_RES_MEM(base, SZ_4K), \ + .periphid = id, \ +} + +/* + * AHB devices are DMA capable, so set their DMA masks + */ +#define AMBA_AHB_DEVICE(name, busid, id, base, data) \ +struct amba_device name##_device = { \ + .dev = __AMBA_DEV(busid, data), \ + .res = DEFINE_RES_MEM(base, SZ_4K), \ + .periphid = id, \ +} + +#endif |