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git.ipfire.org Git - thirdparty/linux.git/blob - include/linux/amba/bus.h
1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/include/amba/bus.h
5 * This device type deals with ARM PrimeCells and anything else that
6 * presents a proper CID (0xB105F00D) at the end of the I/O register
7 * region or that is derived from a PrimeCell.
9 * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
14 #include <linux/clk.h>
15 #include <linux/device.h>
16 #include <linux/mod_devicetable.h>
17 #include <linux/err.h>
18 #include <linux/resource.h>
19 #include <linux/regulator/consumer.h>
21 #define AMBA_NR_IRQS 9
22 #define AMBA_CID 0xb105f00d
23 #define CORESIGHT_CID 0xb105900d
26 * CoreSight Architecture specification updates the ID specification
27 * for components on the AMBA bus. (ARM IHI 0029E)
29 * Bits 15:12 of the CID are the device class.
31 * Class 0xF remains for PrimeCell and legacy components. (AMBA_CID above)
32 * Class 0x9 defines the component as CoreSight (CORESIGHT_CID above)
33 * Class 0x0, 0x1, 0xB, 0xE define components that do not have driver support
35 * Class 0x2-0x8,0xA and 0xD-0xD are presently reserved.
37 * Remaining CID bits stay as 0xb105-00d
41 * Class 0x9 components use additional values to form a Unique Component
42 * Identifier (UCI), where peripheral ID values are identical for different
43 * components. Passed to the amba bus code from the component driver via
44 * the amba_id->data pointer.
45 * @devarch : coresight devarch register value
46 * @devarch_mask: mask bits used for matching. 0 indicates UCI not used.
47 * @devtype : coresight device type value
48 * @data : additional driver data. As we have usurped the original
49 * pointer some devices may still need additional data
51 struct amba_cs_uci_id
{
53 unsigned int devarch_mask
;
58 /* define offsets for registers used by UCI */
59 #define UCI_REG_DEVTYPE_OFFSET 0xFCC
60 #define UCI_REG_DEVARCH_OFFSET 0xFBC
68 unsigned int periphid
;
70 struct amba_cs_uci_id uci
;
71 unsigned int irq
[AMBA_NR_IRQS
];
72 char *driver_override
;
76 struct device_driver drv
;
77 int (*probe
)(struct amba_device
*, const struct amba_id
*);
78 int (*remove
)(struct amba_device
*);
79 void (*shutdown
)(struct amba_device
*);
80 const struct amba_id
*id_table
;
84 * Constants for the designer field of the Peripheral ID register. When bit 7
85 * is set to '1', bits [6:0] should be the JEP106 manufacturer identity code.
88 AMBA_VENDOR_ARM
= 0x41,
89 AMBA_VENDOR_ST
= 0x80,
90 AMBA_VENDOR_QCOM
= 0x51,
91 AMBA_VENDOR_LSI
= 0xb6,
92 AMBA_VENDOR_LINUX
= 0xfe, /* This value is not official */
95 /* This is used to generate pseudo-ID for AMBA device */
96 #define AMBA_LINUX_ID(conf, rev, part) \
97 (((conf) & 0xff) << 24 | ((rev) & 0xf) << 20 | \
98 AMBA_VENDOR_LINUX << 12 | ((part) & 0xfff))
100 extern struct bus_type amba_bustype
;
102 #define to_amba_device(d) container_of(d, struct amba_device, dev)
104 #define amba_get_drvdata(d) dev_get_drvdata(&d->dev)
105 #define amba_set_drvdata(d,p) dev_set_drvdata(&d->dev, p)
107 int amba_driver_register(struct amba_driver
*);
108 void amba_driver_unregister(struct amba_driver
*);
109 struct amba_device
*amba_device_alloc(const char *, resource_size_t
, size_t);
110 void amba_device_put(struct amba_device
*);
111 int amba_device_add(struct amba_device
*, struct resource
*);
112 int amba_device_register(struct amba_device
*, struct resource
*);
113 struct amba_device
*amba_apb_device_add(struct device
*parent
, const char *name
,
114 resource_size_t base
, size_t size
,
115 int irq1
, int irq2
, void *pdata
,
116 unsigned int periphid
);
117 struct amba_device
*amba_ahb_device_add(struct device
*parent
, const char *name
,
118 resource_size_t base
, size_t size
,
119 int irq1
, int irq2
, void *pdata
,
120 unsigned int periphid
);
122 amba_apb_device_add_res(struct device
*parent
, const char *name
,
123 resource_size_t base
, size_t size
, int irq1
,
124 int irq2
, void *pdata
, unsigned int periphid
,
125 struct resource
*resbase
);
127 amba_ahb_device_add_res(struct device
*parent
, const char *name
,
128 resource_size_t base
, size_t size
, int irq1
,
129 int irq2
, void *pdata
, unsigned int periphid
,
130 struct resource
*resbase
);
131 void amba_device_unregister(struct amba_device
*);
132 struct amba_device
*amba_find_device(const char *, struct device
*, unsigned int, unsigned int);
133 int amba_request_regions(struct amba_device
*, const char *);
134 void amba_release_regions(struct amba_device
*);
136 static inline int amba_pclk_enable(struct amba_device
*dev
)
138 return clk_enable(dev
->pclk
);
141 static inline void amba_pclk_disable(struct amba_device
*dev
)
143 clk_disable(dev
->pclk
);
146 static inline int amba_pclk_prepare(struct amba_device
*dev
)
148 return clk_prepare(dev
->pclk
);
151 static inline void amba_pclk_unprepare(struct amba_device
*dev
)
153 clk_unprepare(dev
->pclk
);
156 /* Some drivers don't use the struct amba_device */
157 #define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
158 #define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
159 #define AMBA_MANF_BITS(a) (((a) >> 12) & 0xff)
160 #define AMBA_PART_BITS(a) ((a) & 0xfff)
162 #define amba_config(d) AMBA_CONFIG_BITS((d)->periphid)
163 #define amba_rev(d) AMBA_REV_BITS((d)->periphid)
164 #define amba_manf(d) AMBA_MANF_BITS((d)->periphid)
165 #define amba_part(d) AMBA_PART_BITS((d)->periphid)
167 #define __AMBA_DEV(busid, data, mask) \
169 .coherent_dma_mask = mask, \
170 .init_name = busid, \
171 .platform_data = data, \
175 * APB devices do not themselves have the ability to address memory,
176 * so DMA masks should be zero (much like USB peripheral devices.)
177 * The DMA controller DMA masks should be used instead (much like
178 * USB host controllers in conventional PCs.)
180 #define AMBA_APB_DEVICE(name, busid, id, base, irqs, data) \
181 struct amba_device name##_device = { \
182 .dev = __AMBA_DEV(busid, data, 0), \
183 .res = DEFINE_RES_MEM(base, SZ_4K), \
189 * AHB devices are DMA capable, so set their DMA masks
191 #define AMBA_AHB_DEVICE(name, busid, id, base, irqs, data) \
192 struct amba_device name##_device = { \
193 .dev = __AMBA_DEV(busid, data, ~0ULL), \
194 .res = DEFINE_RES_MEM(base, SZ_4K), \
200 * module_amba_driver() - Helper macro for drivers that don't do anything
201 * special in module init/exit. This eliminates a lot of boilerplate. Each
202 * module may only use this macro once, and calling it replaces module_init()
205 #define module_amba_driver(__amba_drv) \
206 module_driver(__amba_drv, amba_driver_register, amba_driver_unregister)
209 * builtin_amba_driver() - Helper macro for drivers that don't do anything
210 * special in driver initcall. This eliminates a lot of boilerplate. Each
211 * driver may only use this macro once, and calling it replaces the instance
214 #define builtin_amba_driver(__amba_drv) \
215 builtin_driver(__amba_drv, amba_driver_register)